
[Federal Register Volume 88, Number 209 (Tuesday, October 31, 2023)]
[Proposed Rules]
[Pages 74712-74794]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2023-23010]



[[Page 74711]]

Vol. 88

Tuesday,

No. 209

October 31, 2023

Part III





Environmental Protection Agency





-----------------------------------------------------------------------





40 CFR Part 751





Trichloroethylene (TCE); Regulation Under the Toxic Substances Control 
Act (TSCA); Proposed Rule

  Federal Register / Vol. 88 , No. 209 / Tuesday, October 31, 2023 / 
Proposed Rules  

[[Page 74712]]


-----------------------------------------------------------------------

ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 751

[EPA-HQ-OPPT-2020-0642; FRL-8317-01-OCSPP]
RIN 2070-AK83


Trichloroethylene (TCE); Regulation Under the Toxic Substances 
Control Act (TSCA)

AGENCY: Environmental Protection Agency (EPA).

ACTION: Proposed rule.

-----------------------------------------------------------------------

SUMMARY: The Environmental Protection Agency (EPA) is proposing to 
address the unreasonable risk of injury to human health presented by 
trichloroethylene (TCE) under its conditions of use as documented in 
EPA's November 2020 Risk Evaluation for TCE and January 2023 revised 
risk determination for TCE pursuant to the Toxic Substances Control Act 
(TSCA). TCE is widely used as a solvent in a variety of industrial, 
commercial and consumer applications including for hydrofluorocarbon 
(HFC) production, vapor and aerosol degreasing, and in lubricants, 
greases, adhesives, and sealants. TSCA requires that when EPA 
determines a chemical substance presents unreasonable risk that EPA 
address by rule the unreasonable risk of injury to health or the 
environment and apply requirements to the extent necessary so the 
chemical no longer presents unreasonable risk. EPA determined that TCE 
presents an unreasonable risk of injury to health due to the 
significant adverse health effects associated with exposure to TCE, 
including non-cancer effects (liver toxicity, kidney toxicity, 
neurotoxicity, immunotoxicity, reproductive toxicity, and developmental 
toxicity) as well as cancer (liver, kidney, and non-Hodgkin lymphoma) 
from chronic inhalation and dermal exposures to TCE. TCE is a 
neurotoxicant and is carcinogenic to humans by all routes of exposure. 
The most sensitive adverse effects of TCE exposure are non-cancer 
effects (developmental toxicity and immunosuppression) for acute 
exposures and developmental toxicity and autoimmunity for chronic 
exposures. To address the identified unreasonable risk, EPA is 
proposing to: prohibit all manufacture (including import), processing, 
and distribution in commerce of TCE and industrial and commercial use 
of TCE for all uses, with longer compliance timeframes and workplace 
controls for certain processing and industrial and commercial uses 
(including proposed phaseouts and time-limited exemptions); prohibit 
the disposal of TCE to industrial pre-treatment, industrial treatment, 
or publicly owned treatment works, with a time-limited exemption for 
cleanup projects; and establish recordkeeping and downstream 
notification requirements.

DATES: Comments must be received on or before December 15, 2023. Under 
the Paperwork Reduction Act (PRA), comments on the information 
collection provisions are best assured of consideration if the Office 
of Management and Budget (OMB) receives a copy of your comments on or 
before November 30, 2023.

ADDRESSES: Submit your comments, identified by docket identification 
(ID) number EPA-HQ-OPPT-2020-0465, through the Federal eRulemaking 
Portal at https://www.regulations.gov. Follow the online instructions 
for submitting comments. Do not submit electronically any information 
you consider to be Confidential Business Information (CBI) or other 
information whose disclosure is restricted by statute. Additional 
instructions on commenting or visiting the docket, along with more 
information about dockets generally, is available at https://www.epa.gov/dockets.

FOR FURTHER INFORMATION CONTACT: 
    For technical information contact: Gabriela Rossner, Existing 
Chemicals Risk Management Division, Office of Pollution Prevention and 
Toxics, Environmental Protection Agency, 1200 Pennsylvania Ave. NW, 
Washington, DC 20460-0001; telephone number (202) 565-2426; email 
address: [email protected].
    For general information contact: The TSCA-Hotline, ABVI-Goodwill, 
422 South Clinton Ave., Rochester, NY 14620; telephone number: (202) 
554-1404; email address: [email protected].

SUPPLEMENTARY INFORMATION:

I. Executive Summary

A. Does this action apply to me?

    You may be potentially affected by the proposed action if you 
manufacture (defined under TSCA to include import), process, distribute 
in commerce, use, or dispose of TCE or products containing TCE. The 
following list of North American Industrial Classification System 
(NAICS) codes is not intended to be exhaustive, but rather provides a 
guide to help readers determine whether this document applies to them. 
Potentially affected entities include:
     Crude Petroleum Extraction (NAICS code 211120);
     Fossil Fuel Electric Power Generation (NAICS code 221112);
     Other Electric Power Generation (NAICS code 221118);
     Broadwoven Fabric Mills (NAICS code 313210);
     Narrow Fabric Mills and Schiffli Machine Embroidery (NAICS 
code 313220);
     Nonwoven Fabric Mills (NAICS code 313230);
     Textile and Fabric Finishing Mills (NAICS code 313310);
     Fabric Coating Mills (NAICS code 313320);
     Wood Window and Door Manufacturing (NAICS code 321911);
     Prefabricated Wood Building Manufacturing (NAICS code 
321992);
     Paper Bag and Coated and Treated Paper Manufacturing 
(NAICS code 322220);
     Petroleum Refineries (NAICS code 324110);
     All Other Petroleum and Coal Products Manufacturing (NAICS 
code 324199);
     Petrochemical Manufacturing (NAICS code 325110);
     Other Basic Inorganic Chemical Manufacturing (NAICS code 
325180);
     Ethyl Alcohol Manufacturing (NAICS code 325193);
     All Other Basic Organic Chemical Manufacturing (NAICS code 
325199);
     Plastics Material and Resin Manufacturing (NAICS code 
325211);
     Medicinal and Botanical Manufacturing (NAICS code 325411);
     Pharmaceutical Preparation Manufacturing (NAICS code 
325412);
     Paint and Coating Manufacturing (NAICS code 325510);
     Adhesive Manufacturing (NAICS code 325520);
     Polish and Other Sanitation Good Manufacturing (NAICS code 
325612);
     Photographic Film, Paper, Plate and Chemical Manufacturing 
(NAICS code 325992);
     All Other Miscellaneous Chemical Product and Preparation 
Manufacturing (NAICS code 325998);
     Polystyrene Foam Product Manufacturing (NAICS code 
326140);
     Urethane and Other Foam Product (except Polystyrene) 
Manufacturing (NAICS code 326150);
     Tire Manufacturing (except Retreading) (NAICS code 
326211);
     Tire Retreading (NAICS code 326212);
     Rubber and Plastics Hoses and Belting Manufacturing (NAICS 
code 326220);
     Rubber Product Manufacturing for Mechanical Use (NAICS 
code 326291);
     All Other Rubber Product Manufacturing (NAICS code 
326299);

[[Page 74713]]

     Pottery, Ceramics, and Plumbing Fixture Manufacturing 
(NAICS code 327110);
     Gypsum Product Manufacturing (NAICS code 327420);
     Iron and Steel Mills and Ferroalloy Manufacturing (NAICS 
code 331110);
     Iron and Steel Pipe and Tube Manufacturing from Purchased 
Steel (NAICS code 331210);
     Rolled Steel Shape Manufacturing (NAICS code 331221);
     Steel Wire Drawing (NAICS code 331222);
     Nonferrous Metal (except Aluminum) Smelting and Refining 
(NAICS code 331410);
     Copper Rolling, Drawing, Extruding, and Alloying (NAICS 
code.331420);
     Nonferrous Metal (except Copper and Aluminum) Rolling, 
Drawing and Extruding (NAICS code 331491);
     Secondary Smelting, Refining, and Alloying of Nonferrous 
Metal (except Copper and Aluminum) (NAICS code 331492);
     Nonferrous Metal Die-Casting Foundries (NAICS code 
331523);
     Iron and Steel Forging (NAICS code 332111);
     Nonferrous Forging (NAICS code 332112);
     Custom Roll Forming (NAICS code 332114);
     Powder Metallurgy Part Manufacturing (NAICS code 332117);
     Metal Crown, Closure, and Other Metal Stamping (except 
Automotive) (NAICS code 332119);
     Metal Kitchen Cookware, Utensil, Cutlery, and Flatware 
(except Precious) Manufacturing (NAICS code 332215);
     Saw Blade and Handtool Manufacturing (NAICS code 332216);
     Metal Window and Door Manufacturing (NAICS code 332321);
     Sheet Metal Work Manufacturing (NAICS code 332322);
     Ornamental and Architectural Metal Work Manufacturing 
(NAICS code 332323);
     Power Boiler and Heat Exchanger Manufacturing (NAICS code 
332410);
     Metal Tank (Heavy Gauge) Manufacturing (NAICS code 
332420);
     Metal Can Manufacturing (NAICS code 332431);
     Other Metal Container Manufacturing (NAICS code 332439);
     Hardware Manufacturing (NAICS code 332510);
     Spring Manufacturing (NAICS code 332613);
     Other Fabricated Wire Product Manufacturing (NAICS code 
332618);
     Machine Shops (NAICS code 332710);
     Precision Turned Product Manufacturing (NAICS code 
332721);
     Bolt, Nut, Screw, Rivet and Washer Manufacturing (NAICS 
code 332722);
     Metal Heat Treating (NAICS code 332811);
     Metal Coating, Engraving (except Jewelry and Silverware), 
and Allied Services to Manufacturers (NAICS code 332812);
     Electroplating, Plating, Polishing, Anodizing and Coloring 
(NAICS code 332813);
     Industrial Valve Manufacturing (NAICS code 332911);
     Fluid Power Valve and Hose Fitting Manufacturing (NAICS 
code 332912);
     Plumbing Fixture Fitting and Trim Manufacturing (NAICS 
code 332913);
     Other Metal Valve and Pipe Fitting Manufacturing (NAICS 
code 332919);
     Ball and Roller Bearing Manufacturing (NAICS code 332991);
     Small Arms Ammunition Manufacturing (NAICS code 332992);
     Ammunition (except Small Arms) Manufacturing (NAICS code 
332993);
     Small Arms, Ordnance, and Ordnance Accessories 
Manufacturing (NAICS code 332994);
     Fabricated Pipe and Pipe Fitting Manufacturing (NAICS code 
332996);
     All Other Miscellaneous Fabricated Metal Product 
Manufacturing (NAICS code 332999);
     Farm Machinery and Equipment Manufacturing (NAICS code 
333111);
     Lawn and Garden Tractor and Home Lawn and Garden Equipment 
Manufacturing (NAICS code 333112);
     Construction Machinery Manufacturing (NAICS code 333120);
     Mining Machinery and Equipment Manufacturing (NAICS code 
333131);
     Oil and Gas Field Machinery and Equipment Manufacturing 
(NAICS code 333132);
     Food Product Machinery Manufacturing (NAICS code 333241);
     Semiconductor Machinery Manufacturing (NAICS code 333242);
     Sawmill, Woodworking, and Paper Machinery Manufacturing 
(NAICS code 333243);
     Printing Machinery and Equipment Manufacturing (NAICS code 
333244);
     Other Industrial Machinery Manufacturing (NAICS code 
333249);
     Optical Instrument and Lens Manufacturing (NAICS code 
333314);
     Photographic and Photocopying Equipment Manufacturing 
(NAICS code 333316);
     Other Commercial and Service Industry Machinery 
Manufacturing (NAICS code 333318);
     Industrial and Commercial Fan and Blower and Air 
Purification Equipment Manufacturing (NAICS code 333413);
     Heating Equipment (except Warm Air Furnaces) Manufacturing 
(NAICS code 333414);
     Air-Conditioning and Warm Air Heating Equipment and 
Commercial and Industrial Refrigeration Equipment Manufacturing (NAICS 
code 333415);
     Industrial Mold Manufacturing (NAICS code 333511);
     Special Die and Tool, Die Set, Jig and Fixture 
Manufacturing (NAICS code 333514);
     Cutting Tool and Machine Tool Accessory Manufacturing 
(NAICS code 333515);
     Machine Tool Manufacturing (NAICS code 333517);
     Rolling Mill and Other Metalworking Machinery 
Manufacturing (NAICS code 333519);
     Turbine and Turbine Generator Set Unit Manufacturing 
(NAICS code 333611);
     Speed Changer, Industrial High-Speed Drive and Gear 
Manufacturing (NAICS code 333612);
     Mechanical Power Transmission Equipment Manufacturing 
(NAICS code 333613);
     Other Engine Equipment Manufacturing (NAICS code 333618);
     Air and Gas Compressor Manufacturing (NAICS code 333912);
     Measuring, Dispensing, and Other Pumping Equipment 
Manufacturing (NAICS code 333914);
     Elevator and Moving Stairway Manufacturing (NAICS code 
333921);
     Conveyor and Conveying Equipment Manufacturing (NAICS code 
333922);
     Overhead Traveling Crane, Hoist and Monorail System 
Manufacturing (NAICS code 333923);
     Industrial Truck, Tractor, Trailer and Stacker Machinery 
Manufacturing (NAICS code 333924);
     Power-Driven Hand Tool Manufacturing (NAICS code 333991);
     Welding and Soldering Equipment Manufacturing (NAICS code 
333992);
     Packaging Machinery Manufacturing (NAICS code 333993);
     Industrial Process Furnace and Oven Manufacturing (NAICS 
code 333994);
     Fluid Power Cylinder and Actuator Manufacturing (NAICS 
code 333995);
     Fluid Power Pump and Motor Manufacturing (NAICS code 
333996);
     Scale and Balance Manufacturing (NAICS code 333997);
     All Other Miscellaneous General Purpose Machinery 
Manufacturing (NAICS code 333999);
     Audio and Video Equipment Manufacturing (NAICS code 
334310);
     Capacitor, Resistor, Coil, Transformer, and Other Inductor 
Manufacturing (NAICS code 334416);
     Electronic Connector Manufacturing (NAICS code 334417);

[[Page 74714]]

     Printed Circuit Assembly (Electronic Assembly) 
Manufacturing (NAICS code 334418);
     Other Electronic Component Manufacturing (NAICS code 
334419);
     Search, Detection, Navigation, Guidance, Aeronautical, and 
Nautical System and Instrument Manufacturing (NAICS code 334511);
     Automatic Environmental Control Manufacturing for 
Residential, Commercial and Appliance Use (NAICS code 334512);
     Instruments and Related Products Manufacturing for 
Measuring, Displaying, and Controlling Industrial Process Variables 
(NAICS code 334513);
     Instrument Manufacturing for Measuring and Testing 
Electricity and Electrical Signals (NAICS code 334515);
     Electric Lamp Bulb and Part Manufacturing (NAICS code 
335110);
     Residential Electric Lighting Fixture Manufacturing (NAICS 
code 335121);
     Commercial, Industrial and Institutional Electric Lighting 
Fixture Manufacturing (NAICS code 335122);
     Other Lighting Equipment Manufacturing (NAICS code 
335129);
     Major Household Appliance Manufacturing (NAICS code 
335220);
     Power, Distribution and Specialty Transformer 
Manufacturing (NAICS code 335311);
     Motor and Generator Manufacturing (NAICS code 335312);
     Switchgear and Switchboard Apparatus Manufacturing (NAICS 
code 335313);
     Relay and Industrial Control Manufacturing (NAICS code 
335314);
     Storage Battery Manufacturing (NAICS code 335911);
     Fiber Optic Cable Manufacturing (NAICS code 335921);
     Current-Carrying Wiring Device Manufacturing (NAICS code 
335931);
     Carbon and Graphite Product Manufacturing (NAICS code 
335991);
     Automobile Manufacturing (NAICS code 336111);
     Light Truck and Utility Vehicle Manufacturing (NAICS code 
336112);
     Heavy Duty Truck Manufacturing (NAICS code 336120);
     Motor Vehicle Body Manufacturing (NAICS code 336211);
     Truck Trailer Manufacturing (NAICS code 336212);
     Motor Home Manufacturing (NAICS code 336213);
     Travel Trailer and Camper Manufacturing (NAICS code 
336214);
     Motor Vehicle Gasoline Engine and Engine Parts 
Manufacturing (NAICS code 336310);
     Motor Vehicle Electrical and Electronic Equipment 
Manufacturing (NAICS code 336320);
     Motor Vehicle Steering and Suspension Components (except 
Spring) Manufacturing (NAICS code 336330);
     Motor Vehicle Brake System Manufacturing (NAICS code 
336340);
     Motor Vehicle Transmission and Power Train Parts 
Manufacturing (NAICS code 336350);
     Motor Vehicle Seating and Interior Trim Manufacturing 
(NAICS code 336360);
     Motor Vehicle Metal Stamping (NAICS code 336370);
     Other Motor Vehicle Parts Manufacturing (NAICS code 
336390);
     Aircraft Manufacturing (NAICS code 336411);
     Aircraft Engine and Engine Parts Manufacturing (NAICS code 
336412);
     Other Aircraft Part and Auxiliary Equipment Manufacturing 
(NAICS code 336413);
     Guided Missile and Space Vehicle Manufacturing (NAICS code 
336414);
     Guided Missile and Space Vehicle Propulsion Unit and 
Propulsion Unit Parts Manufacturing (NAICS code 336415);
     Other Guided Missile and Space Vehicle Parts and Auxiliary 
Equipment Manufacturing (NAICS code 336419);
     Railroad Rolling Stock Manufacturing (NAICS code 336510);
     Ship Building and Repairing (NAICS code 336611);
     Boat Building (NAICS code 336612);
     Motorcycle, Bicycle and Parts Manufacturing (NAICS code 
336991);
     Military Armored Vehicle, Tank and Tank Component 
Manufacturing (NAICS code 336992);
     All Other Transportation Equipment Manufacturing (NAICS 
code 336999);
     Wood Kitchen Cabinet and Counter Top Manufacturing (NAICS 
code 337110);
     Upholstered Household Furniture Manufacturing (NAICS code 
337121);
     Nonupholstered Wood Household Furniture Manufacturing 
(NAICS code 337122);
     Metal Household Furniture Manufacturing (NAICS code 
337124);
     Institutional Furniture Manufacturing (NAICS code 337127);
     Wood Office Furniture Manufacturing (NAICS code 337211);
     Surgical Appliance and Supplies Manufacturing (NAICS code 
339113);
     Dental Equipment and Supplies Manufacturing (NAICS code 
339114);
     Jewelry and Silverware Manufacturing (NAICS code 339910);
     Sporting and Athletic Goods Manufacturing (NAICS code 
339920);
     Gasket, Packing, and Sealing Device Manufacturing (NAICS 
code 339991);
     Fastener, Button, Needle and Pin Manufacturing (NAICS code 
339993);
     All Other Miscellaneous Manufacturing (NAICS code 339999);
     Metal Service Centers and Other Metal Merchant Wholesalers 
(NAICS code 423510);
     Industrial Supplies Merchant Wholesalers (NAICS code 
423510);
     Other Chemical and Allied Products Merchant Wholesalers 
(NAICS code 424690);
     Paint, Varnish, and Supplies Merchant Wholesalers (NAICS 
code 424950);
     New Car Dealers (NAICS code 441110);
     Used Car Dealers (NAICS code 441120);
     Sporting Goods Stores (NAICS code 451110);
     Scheduled Passenger Air Transportation (NAICS code 
481111);
     Other Support Activities for Air Transportation (NAICS 
code 481111);
     Other Warehousing and Storage (NAICS code 493190);
     Motion Picture and Video Production (NAICS code 512110);
     Other Financial Vehicles (NAICS code 525990);
     Research and Development in the Physical, Engineering, and 
Life Sciences (except Nanotechnology and Biotechnology) (NAICS code 
541715);
     Research and Development in the Social Sciences and 
Humanities (NAICS code 541720);
     Offices of Other Holding Companies (NAICS code 551112);
     Carpet and Upholstery Cleaning Services (NAICS code 
561740);
     Hazardous Waste Treatment and Disposal (NAICS code 
562211);
     Solid Waste Landfill (NAICS code 562212);
     Materials Recovery Facilities (NAICS code 562920);
     Junior Colleges (NAICS code 611210);
     Colleges, Universities and Professional Schools (NAICS 
code 611310);
     General Automotive Repair (NAICS code 811111);
     Automotive Exhaust System Repair (NAICS code 811112);
     Automotive Transmission Repair (NAICS code 811113);
     Other Automotive Mechanical and Electrical Repair and 
Maintenance (NAICS code 811118);
     Automotive Body, Paint and Interior Repair and Maintenance 
(NAICS code 811121);
     Automotive Glass Replacement Shops (NAICS code 811122);
     Automotive Oil Change and Lubrication Shops (NAICS code 
811191);

[[Page 74715]]

     All Other Automotive Repair and Maintenance (NAICS code 
811198);
     Consumer Electronics Repair and Maintenance (NAICS code 
811211);
     Computer and Office Machine Repair and Maintenance (NAICS 
code 811212);
     Communication Equipment Repair and Maintenance (NAICS code 
811213);
     Other Electronic and Precision Equipment Repair and 
Maintenance (NAICS code 811219);
     Commercial and Industrial Machinery and Equipment (except 
Automotive and Electronic) Repair and Maintenance (NAICS code 811310);
     Home and Garden Equipment Repair and Maintenance (NAICS 
code 811411);
     Other Personal and Household Goods Repair and Maintenance 
(NAICS code 811490);
     Coin-Operated Laundries and Drycleaners (NAICS code 
812310);
     Drycleaning and Laundry Services (except Coin-Operated) 
(NAICS code 812320); and
     Industrial Launderers (NAICS code 812332).
    This action may also affect certain entities through pre-existing 
import certification and export notification rules under TSCA. Persons 
who import any chemical substance governed by a final TSCA section 6(a) 
rule are subject to the TSCA section 13 (15 U.S.C. 2612) import 
certification requirements and the corresponding regulations at 19 CFR 
12.118 through 12.127; see also 19 CFR 127.28. Those persons must 
certify that the shipment of the chemical substance complies with all 
applicable rules and orders under TSCA. The EPA policy in support of 
import certification appears at 40 CFR part 707, subpart B. In 
addition, any persons who export or intend to export a chemical 
substance that is the subject of this proposed rule are subject to the 
export notification provisions of TSCA section 12(b) (15 U.S.C. 
2611(b)), and must comply with the export notification requirements in 
40 CFR part 707, subpart D.
    If you have any questions regarding the applicability of this 
proposed action to a particular entity, consult the technical 
information contact listed under FOR FURTHER INFORMATION CONTACT.

B. What is the Agency's authority for taking this action?

    Under TSCA section 6(a) (15 U.S.C. 2605(a)), if EPA determines 
through a TSCA section 6(b) risk evaluation that a chemical substance 
presents an unreasonable risk of injury to health or the environment, 
EPA must by rule apply one or more requirements listed in TSCA section 
6(a) to the extent necessary so that the chemical substance or mixture 
no longer presents such risk.

C. What action is the Agency taking?

    Pursuant to TSCA section 6(b), EPA determined that TCE presents an 
unreasonable risk of injury to health, without consideration of costs 
or other nonrisk factors, including an unreasonable risk to potentially 
exposed or susceptible subpopulations (PESS) identified as relevant to 
the 2020 Risk Evaluation for TCE by EPA, under the conditions of use 
(Refs. 1, 2). The term ``conditions of use'' is defined at TSCA section 
3(4) (15 U.S.C. 2602(4)) to mean the circumstances under which a 
chemical substance is intended, known, or reasonably foreseen to be 
manufactured, processed, distributed in commerce, used, or disposed of. 
A detailed description of the conditions of use that EPA evaluated in 
reaching its determination that TCE presents an unreasonable risk is 
included in Unit III.B.1. EPA notes that all TSCA conditions of use of 
TCE are subject to this proposal. Accordingly, to address the 
unreasonable risk, EPA is proposing, under TSCA section 6(a), to:
    (i) Prohibit the manufacture (including import), processing, and 
distribution in commerce of TCE for all uses (including all consumer 
uses (see Unit III.B.1.f)), as described in Unit V.A.1., with longer 
compliance timeframes for manufacture and processing related to certain 
uses;
    (ii) Prohibit the industrial and commercial use of TCE, as 
described in Unit V.A.1., with longer compliance timeframes for certain 
uses;
    (iii) Prohibit the manufacture (including import) and processing of 
TCE as an intermediate for the manufacturing of hydrofluorocarbon134a 
(HFC-134a), following an 8.5-year phaseout, as described in Unit 
V.A.1.d.;
    (iv) Prohibit the industrial and commercial use of TCE as a solvent 
for closed-loop batch vapor degreasing for rayon fabric scouring for 
end use in rocket booster nozzle production by Federal agencies and 
their contractors, following a 10-year phaseout, outlined in Unit 
V.A.1.e.;
    (iv) For Department of Defense (DoD) naval vessels and their 
systems, and in the maintenance, fabrication, and sustainment for and 
of such vessels and systems, prohibit the industrial and commercial use 
of TCE as potting compounds for naval electronic systems and equipment; 
sealing compounds for high and ultra-high vacuum systems; bonding 
compounds for materials testing and maintenance of underwater systems 
and bonding of nonmetallic materials; and cleaning requirements (which 
includes degreasing using wipes, sprays, solvents and vapor degreasing) 
for: materials and components required for military ordinance testing; 
temporary resin repairs in vessel spaces where welding is not 
authorized; ensuring polyurethane adhesion for electronic systems and 
equipment repair and installation of elastomeric materials; various 
naval combat systems, radars, sensors, equipment; fabrication and 
prototyping processes to remove coolant and other residue from machine 
parts; machined part fabrications for naval systems; installation of 
topside rubber tile material aboard vessels; and vapor degreasing 
required for substrate surface preparation prior to electroplating 
processes, following a 10-year TSCA section 6(g) exemption, outlined in 
Unit V.A.3.;
    (v) Prohibit the manufacture (including import), processing, 
distribution in commerce, and use of TCE as a processing aid for 
battery separator manufacturing, following a 10-year TSCA section 6(g) 
exemption, as described in Unit V.A.3.;
    (vi) Prohibit the manufacture (including import), processing, 
distribution in commerce, and use of TCE as a laboratory chemical for 
essential laboratory activities and some research and development 
activities, following a 50-year TSCA section 6(g) exemption, as 
described in Unit V. A.3.;
    (vii) Prohibit the manufacture (including import), processing, 
distribution in commerce, and industrial and commercial use of TCE as a 
solvent in closed loop vapor degreasing necessary for human-rated 
rocket engine cleaning by the National Aeronautics and Space 
Administration (NASA) and its contractors, following a 7-year TSCA 
section 6(g) exemption, as described in Unit V.A.3.;
    (viii) Prohibit the emergency industrial and commercial use of TCE 
in furtherance of the NASA mission for specific conditions that are 
critical or essential and for which no technically and economically 
feasible safer alternative is available, following a 10-year TSCA 
section 6(g) exemption, as described in Unit V.A.3.;
    (ix) Require strict workplace controls, including compliance with a 
TCE workplace chemical protection program (WCPP), which would include 
requirements for an inhalation exposure limit and dermal protection to 
limit exposure to TCE, for conditions of use with long term phaseouts 
or time-

[[Page 74716]]

limited exemptions under TSCA section 6(g), as described in Unit 
V.A.2.;
    (x) Prohibit, due to worker risks, the disposal of TCE to 
industrial pre-treatment, industrial treatment, or publicly owned 
treatment works, with a 50-year TSCA section 6(g) exemption for cleanup 
projects, as described in Unit V.A.3.; and
    (xi) Establish recordkeeping and downstream notification 
requirements, as described in Unit V.A.4.
    In addition, EPA is proposing to amend the general provisions of 40 
CFR part 751, subpart A, to define the following terms so that these 
definitions may be commonly applied to this and other rules under TSCA 
section 6 that would be codified under 40 CFR part 751: ``authorized 
person,'' ``ECEL,'' ``exposure group,'' ``owner or operator,'' 
``potentially exposed person,'' ``regulated area,'' and ``retailer.''
    EPA seeks public comment on all aspects of this proposed rule.

D. Why is the Agency taking this action?

    Under TSCA section 6(a), ``[i]f the Administrator determines in 
accordance with subsection (b)(4)(A) that the manufacture, processing, 
distribution in commerce, use or disposal of a chemical substance or 
mixture, or that any combination of such activities, presents an 
unreasonable risk of injury to health or the environment, the 
Administrator shall by rule . . . apply one or more of the [section 
6(a)] requirements to such substance or mixture to the extent necessary 
so that the chemical substance or mixture no longer presents such 
risk.'' TCE was the subject of a risk evaluation under TSCA section 
6(b)(4)(A) that was issued in November 2020 (Ref. 1). In addition, EPA 
issued a revised unreasonable risk determination in January 2023 (Ref. 
2), determining that TCE, as a whole chemical substance, presents an 
unreasonable risk of injury to health under the conditions of use. As a 
result, EPA is proposing to take action to the extent necessary so that 
TCE no longer presents such risk. The unreasonable risk is described in 
Unit III.B.2. and the conditions of use EPA evaluated in reaching its 
conclusion that TCE presents unreasonable risk are described in Unit 
III.B.1.
    TCE's hazards are well established. EPA's 2020 Risk Evaluation for 
TCE considered the hazards associated with exposure to TCE and 
determined that TCE presents an unreasonable risk of injury to health 
due to the significant adverse health effects associated with exposure 
to TCE. While some of the risks of adverse effects from TCE exposure 
are experienced following acute single exposures, other risks are 
incurred following long-term repeated exposures. Risk of non-cancer 
effects, specifically fetal cardiac defects and autoimmunity following 
chronic exposure, are the most sensitive adverse effects. In addition, 
risks of other significant adverse outcomes associated with TCE 
exposure include: Non-cancer effects (liver toxicity, kidney toxicity, 
neurotoxicity, immunosuppression, reproductive toxicity, and 
developmental toxicity), as well as cancer effects (liver, kidney, and 
non-Hodgkin lymphoma). EPA is proposing requirements so that TCE would 
no longer present unreasonable risk to human health.
    While EPA's proposal would ultimately result in a complete ban on 
TCE, the Agency recognizes that a phaseout of TCE for some TSCA 
conditions of use may be appropriate. The timeframes for the phaseouts 
differ across conditions of use and are described in fuller detail in 
Unit V.A.1.d. and e. One phaseout is for uses that may impact the 
Agency's efforts to address climate-damaging HFCs (and the associated 
adverse impacts on human health and the environment) under the American 
Innovation and Manufacturing Act of 2020 (AIM Act) (42 U.S.C. 7675). 
EPA proposes to implement a longer phaseout in tandem with strict 
workplace controls for the manufacturing (including import) and 
processing of TCE as an intermediate in the generation of HFC-134a, one 
of the regulated substances subject to a phasedown under the AIM Act 
(More information on HFC-134a is in Unit V.A.1.). While HFC-134a is one 
of the regulated substances subject to AIM Act 85% phasedown in 
generation and consumption by 2023, HFC-134a can be mixed with other 
substances to make lower global warming potential (GWP) blends that are 
likely to be used to facilitate the transition from certain other HFCs 
and HFC blends with higher global warming potentials in certain 
applications.
    Additionally, the Agency recognizes that some conditions of use may 
not have alternatives readily available. As an example, EPA is 
proposing a longer phaseout timeframe for industrial and commercial use 
as a solvent for closed-loop batch vapor degreasing for rayon fabric 
scouring for end use in rocket booster nozzle production by Federal 
agencies and their contractors, in addition to the uses of TCE 
necessary for DoD vessels. Currently, substitutes and alternative 
processes do not meet the technical specifications required to clean 
the rayon fabric in order to safely produce rockets.
    Additionally, EPA recognizes that some conditions of use may be 
important for national security applications or for other critical 
needs. For these reasons, EPA's proposal includes a 10-year exemption 
under TSCA section 6(g) for industrial and commercial use of TCE as a 
processing aid for battery separator manufacturing in the production of 
lead-acid and lithium battery separators, as well as for the 
manufacturing, processing, and distribution in commerce of TCE for this 
use (See Unit V.A.3.a.i.). EPA recognizes that lead-acid and lithium 
battery separators are essential components of batteries that power 
vehicles and systems in the U.S. supply chain for multiple critical 
infrastructure sectors within the national economy. Further, there are 
a number of critical uses required for DoD vessels. EPA is proposing a 
10-year exemption under TSCA section 6(g) for DoD vessel requirements 
for potting, bonding and sealing compounds, and bonding and cleaning 
requirements for naval combat systems, radars, sensors, equipment, and 
fabrication and prototyping processes. Additionally, EPA is proposing a 
50-year exemption under TSCA section 6(g) for the industrial and 
commercial use of TCE in laboratory use for essential laboratory 
activities which are particularly critical; for example, laboratory 
activities associated with ongoing environmental cleanup projects that 
fall under the Superfund program or other similar EPA authorities, in 
which it is necessary to use TCE as a laboratory chemical for the 
analysis of contaminated soil, air, and water samples (See Unit 
V.A.3.a.iii.).
    EPA considered the potential impact of the prohibition of the total 
production volume of TCE regulated under TSCA on the availability of 
TCE for critical or essential uses, for uses essential to the national 
economy, national security, or critical infrastructure, and for uses 
for which longer phase-out timeframes are proposed. EPA concluded, 
based on information received through stakeholder engagement and 
professional judgment, that there would remain a sufficient supply of 
TCE in circulation for these uses. EPA requests comment on whether 
there would remain a sufficient supply of TCE in circulation to provide 
a source for those limited critical or essential uses exempted under 
TSCA section 6(g), as described in Unit V. (Ref. 3).

E. What are the estimated incremental impacts of this action?

    EPA has prepared an Economic Analysis of the potential incremental

[[Page 74717]]

impacts associated with this rulemaking that can be found in the 
rulemaking docket (Ref. 3). As described in more detail in the Economic 
Analysis (Ref. 3) and in Units VII.D. and XI.D., EPA was unable to 
quantify all incremental costs of this proposed rule. The quantifiable 
cost of the proposed rule is estimated to be $33.1 million annualized 
over 20 years at a 3% discount rate and $40.6 million annualized over 
20 years at a 7% discount rate. These costs take compliance with 
implementation of a WCPP into consideration, which would include an 
existing chemical exposure limit (ECEL) of 0.0011 ppm (1.1 ppb; 0.0059 
mg/m\3\) for inhalation exposures as an 8-hour time-weighted average 
(TWA), applicable personal protective equipment (PPE) requirements, and 
reformulation costs of numerous products. There are a number of notable 
unquantified costs. These are described in this Unit and more fully in 
section 7.11 of the Economic Analysis (Ref. 3).
    Alternative products with similar cost and efficacy are available 
for most of the products that are formulated with TCE. However, for 
some applications, there may be additional unquantified costs 
associated with the alternatives or in cases where alternatives are not 
currently available. For instance, in some cases, some effort might be 
required by firms using TCE products to identify suitable alternatives, 
test them for their desired applications, learn how to use them safely 
and effectively, and implement new processes for using the alternative 
products. There may also be some safety-critical applications where 
alternatives would need to undergo extensive safety reviews and testing 
before they could replace the TCE products. The information to estimate 
how often these costs might be incurred or what the specific costs 
would be per-user or per-firm when they are incurred is not available. 
Therefore, EPA is unable to consider these costs quantitatively.
    There also may be some unquantified costs associated with the 
implementation of a WCPP. EPA estimated a distribution for air 
monitoring results but since these data were not collected in the same 
way monitoring data under a WCPP would be collected, these estimated 
distributions are uncertain and therefore, the costs of the WCPP are 
uncertain. The WCPP costs also assume that when the exposure levels 
exceed the ECEL, compliance is achieved by implementing a respirator 
PPE program. However, the options require that feasible engineering and 
administrative controls are implemented before resorting to PPE use. 
These costs would be specific to individual firms, and EPA does not 
have sufficient information to estimate these costs.
    The costs of alternative identification, testing, and potential 
process changes to battery separator manufacturers could not be 
estimated. And, if battery separator manufacturers are unable to 
transition to TCE-free production processes within the 10-year 
timeframe, there could be battery separator supply chain disruptions. 
According to one battery separator manufacturer submitting an exemption 
request to EPA, 80% of lead-acid and lithium-ion batteries are built 
using battery separators manufactured with TCE. According to the 
Battery Council International, the U.S. lead-acid battery industry 
provides $13.7 billion in gross domestic product. Both battery 
separator manufacturers submitting exemption requests noted that there 
was only one domestic battery separator manufacturer that does not use 
TCE for each of lead-acid and lithium batteries, and they asserted that 
the manufacturers would not have sufficient capacity to meet domestic 
battery separator demand on their own and could likely support less 
than half of the U.S. battery production need. In addition, they also 
noted that the domestic battery separator manufacturer that does not 
use TCE for lithium batteries uses a ``dry process'' instead of a ``wet 
process'', and the ``dry process'' does not allow for reliable 
manufacture of the 9-12 [mu]m separators that are generally used for 
electric vehicle applications. However, the magnitude of economic 
impacts from a potential supply chain disruption is uncertain, 
particularly since EPA could take subsequent regulatory action to 
extend, modify, or eliminate the exemption on the basis of reasonably 
available information and adequate public justification.
    EPA expects the processing of TCE as an intermediate for the 
manufacture of HFC-134a to decline over time, in light of the AIM Act 
requirements (Ref. 4). At some point, the domestic manufacture of HFC-
134a may be discontinued. While the timing for this discontinuation is 
uncertain, it is unclear whether the proposed rule would hasten the 
closure of plants that use TCE to produce HFC-134a. There would be some 
unknown cost impacts associated with hastening the closure of these two 
plants.
    Costs to both fluoroelastomer producers using TCE and those using 
TCE as an intermediate to manufacture hydrochloric acid (HCl) may 
include potential supply chain disruptions, which could not be 
estimated. It is expected that these facilities would need to adopt 
process and/or physical plant changes in order to comply with the 
proposed rule. EPA does not have sufficient information to estimate the 
costs of the prohibition to these sectors.
    Additionally, EPA is proposing a 10-year phaseout for the 
industrial and commercial use of TCE as a solvent for closed-loop batch 
vapor degreasing for rayon fabric scouring for end use in rocket 
booster nozzle production by Federal agencies and their contractors, 
conditioned on Federal agencies performing within 5 years a final pre-
launch test of rocket booster nozzles that have been produced without 
using TCE. EPA does not have information to estimate the cost of such a 
test. The disposal of TCE from cleanup projects to industrial pre-
treatment, industrial treatment, or publicly owned treatment work would 
be prohibited after the section 6(g) exemption ends, 50 years after the 
rule is finalized. Cleanup sites would need to identify and implement 
alternative disposal or treatment methods, and would likely also need 
to renegotiate RCRA permits or CERCLA agreements to include those 
changes. These approaches could be more costly to implement and/or 
increase the duration of cleanups allowing any potential environmental 
or human health impacts to continue for a longer period of time. The 
information to estimate how often these costs might be incurred or what 
the specific costs would be per site when they are incurred is not 
available. Furthermore, the number of sites affected by this 
prohibition is unknown.
    Finally, EPA could not estimate any potential business closures or 
off-shoring of businesses that might result from the proposed rule. 
Vapor degreasing is one use of TCE where switching to a suitable 
alternative may be challenging and where closing or off-shoring may be 
a compliance strategy. EPA estimates that 366 facilities still use TCE 
in vapor degreasers, a majority of which are small businesses. There is 
no standard generally accepted approach for estimating the cost impacts 
of a firm closure. Despite information EPA has sought from 
stakeholders, including through a Small Business Advocacy Review (SBAR) 
Panel, it is still unclear as to the entire impact of a prohibition of 
TCE vapor degreasing.
    The actions proposed in this rulemaking are expected to achieve 
health benefits for the American public, some of which can be monetized 
and others that, while tangible and significant, cannot at present be 
monetized. The monetized benefits of this rulemaking are approximately 
$18.1 to $21.5 million annualized over 20

[[Page 74718]]

years at a 3% discount rate and $8.2 to $10.3 million annualized over 
20 years at a 7% discount rate. The monetized benefits only include 
liver, kidney, and non-Hodgkin's lymphoma cancers.
    There are a number of non-cancer endpoints associated with exposure 
to TCE, including liver toxicity, kidney toxicity, reproductive 
effects, neurotoxicity, immunotoxicity effects and fetal cardiac 
defects (Ref. 1). There is human evidence for hepatitis accompanying 
immune-related generalized skin diseases, jaundice, hepatomegaly, 
hepatosplenomegaly, and liver failure in TCE-exposed workers and 
changes in the proximal tubules of the kidney following exposure to 
TCE, and occupational studies have shown increased levels of kidney 
damage (proximal tubules) and end-stage renal disease in TCE-exposed 
workers. Evidence exists to associate TCE with reproductive effects. 
Most human studies support an association between TCE exposure and 
alterations in sperm density and quality, as well as changes in sexual 
drive or function and serum endocrine levels. Fewer epidemiological 
studies exist linking decreased incidence of fecundability (time-to-
pregnancy) and menstrual cycle disturbances in women with TCE 
exposures. Human studies have consistently reported vestibular system-
related symptoms such as headaches, dizziness, and nausea following TCE 
exposure. Several newer epidemiological studies have found an 
association between TCE exposure and neurodegenerative disorders such 
as amyotrophic lateral sclerosis and Parkinson's disease (Ref. 1). EPA 
does not have sufficient information to estimate the monetized benefits 
of the proposed rule with respect to these non-cancer effects, and 
therefore monetized benefits are likely underestimated.
    EPA does estimate that there are 52,595 workers and occupational 
non-users (ONUs, or people who do not directly handle the chemical, but 
are in close proximity) exposed to TCE and of those, approximately 982 
pregnant workers and ONUs annually that may potentially benefit from a 
reduced risk of fetal cardiac defects resulting from reduced TCE 
exposure. Although EPA has not developed a complete estimate of the 
monetized benefits associated with avoiding fetal cardiac defects, as 
described in the Economic Analysis (Ref. 3), Arth, Tinker et al. (Ref. 
5) estimated a mean annual cost of $41,166 (2013$) (median $14,552) for 
each fetal cardiac defects-associated hospitalization. For critical 
fetal cardiac defects, mean and median costs were estimated at $79,011 
and $29,886 (2013$), respectively for each incidence. In addition to 
hospitalization costs, individuals with fetal cardiac defects will 
likely incur healthcare costs associated with physician visits and 
outpatient care. They are also more likely to require specialized 
healthcare such as medications, physical or speech therapy, or 
treatment for developmental or behavioral problems (Ref. 6). Additional 
social costs may include caregiver burden and mental health services 
(Ref. 7), as well as non-market costs such as pain and suffering and 
fetal cardiac defect-related mortality. Because these costs are not 
accounted for, monetized benefits are likely underestimated. The 
severity of specific types of fetal cardiac defects and associated 
costs will vary depending on the type of heart defect. EPA requests 
comment on information that would allow EPA to quantify the magnitude 
of avoided risk of fetal cardiac defects due to reductions in TCE 
exposure under the proposed rulemaking.
    Additionally, to the extent that the proposed rule reduces the 
amount of TCE in drinking water systems and thereby exposures to 
populations using those drinking water sources, there could be 
potential health-related benefits related to improved drinking water 
quality that EPA was unable to quantify.

II. Background

A. Overview of TCE

    This proposed rule applies to TCE (CASRN 79-01-6) and is intended 
to address the unreasonable risk of injury to health that EPA has 
identified for TCE. TCE is a volatile organic compound (VOC) used in 
industry as well as in commercial and consumer products. The total 
aggregate annual production volume ranged from 100 to 250 million 
pounds between 2016 and 2019 according to CDR (Ref. 8). The majority of 
TCE is processed as an intermediate during the manufacture of 
refrigerants, specifically HFC-134a, which accounts for about 83.6% of 
TCE's annual production volume (Ref. 1). TCE is also used as a solvent, 
frequently in cleaning and degreasing (including spot cleaning, vapor 
degreasing, cold cleaning, and aerosol degreasing), which accounts for 
another 14.7% of TCE production volume, leaving approximately 1.7% for 
other uses. As outlined in Unit III.B.1., TCE is used as a solvent in a 
variety of commercial and consumer applications including lubricants, 
adhesives and sealants, paints and coatings, and other miscellaneous 
products.

B. Regulatory Actions Pertaining to TCE

    TCE is subject to numerous Federal laws and regulations in the 
United States and is also subject to regulation by some States and 
other countries. A summary of EPA regulations pertaining to TCE, as 
well as other Federal, State, and international regulations (Ref. 9) is 
in the docket and in Appendix A of the 2020 Risk Evaluation for TCE 
(Ref. 1).
    C. Consideration of Occupational Safety and Health Administration 
(OSHA) Occupational Health Standards in TSCA Risk Evaluations and TSCA 
Risk Management Actions
    Although EPA must consider and factor in, to the extent 
practicable, certain non-risk factors as part of TSCA section 6(a) 
rulemaking (see TSCA section 6(c)(2)), EPA must nonetheless still 
ensure that the selected regulatory requirements apply ``to the extent 
necessary so that the chemical substance or mixture no longer presents 
[unreasonable] risk.'' This requirement to eliminate unreasonable risk 
is distinguishable from approaches mandated by some other laws, 
including the Occupational Safety and Health Act (OSH Act), which 
includes both significant risk and feasibility (technical and economic) 
considerations in the setting of standards.
    Congress intended for EPA to consider occupational risks from 
chemicals it evaluates under TSCA, among other potential exposures, as 
relevant and appropriate. As noted previously, TSCA section 6(b) 
requires EPA to evaluate risks to PESS identified as relevant by the 
Administrator. TSCA section 3(12) defines the term ``potentially 
exposed or susceptible subpopulation'' as ``a group of individuals 
within the general population identified by the Administrator who, due 
to either greater susceptibility or greater exposure, may be at greater 
risk than the general population of adverse health effects from 
exposure to a chemical substance or mixture, such as infants, children, 
pregnant women, workers, or the elderly.''
    The OSH Act similarly requires OSHA to evaluate risk specific to 
workers prior to promulgating new or revised standards and requires 
OSHA standards to substantially reduce significant risk to the extent 
feasible, even if workers are exposed over a full working lifetime. See 
29 U.S.C. 655(b)(5); Indus. Union Dep't, AFL-CIO v. Am. Petroleum 
Inst., 448 U.S. 607, 642 (1980) (plurality opinion).
    Thus, the standards for chemical hazards that OSHA promulgates 
under the OSH Act share a broadly similar

[[Page 74719]]

purpose with the standards that EPA promulgates under TSCA section 
6(a). The control measures OSHA and EPA require to satisfy the 
objectives of their respective statutes may also, in many 
circumstances, overlap or coincide. However, as this unit outlines, 
there are important differences between EPA's and OSHA's regulatory 
approaches and jurisdiction, and EPA considers these differences when 
deciding whether and how to account for OSHA requirements (Ref. 9) when 
evaluating and addressing potential unreasonable risk to workers so 
that compliance requirements are clearly explained to the regulated 
community.
1. OSHA Requirements
    OSHA's mission is to ensure that employees work in safe and 
healthful conditions. The OSH Act establishes requirements that each 
employer comply with the General Duty Clause of the Act (29 U.S.C. 
654(a)), as well as with occupational safety and health standards 
issued under the Act.
a. General Duty Clause of the OSH Act
    The General Duty Clause of the OSH Act requires employers to keep 
their workplaces free from recognized hazards that are causing or are 
likely to cause death or serious physical harm to employees. The 
General Duty Clause is cast in general terms, and does not establish 
specific requirements like exposure limits, PPE, or other specific 
protective measures that EPA could potentially consider when developing 
its risk evaluations or risk management requirements. OSHA, under 
limited circumstances, has cited the General Duty Clause for regulating 
exposure to chemicals. To prove a violation of the General Duty Clause, 
OSHA must prove employer or industry recognition of the hazard, the 
hazard was causing or likely to cause death or serious physical harm, 
and a feasible method to eliminate or materially reduce the hazard was 
available. In rare situations, OSHA has cited employers for violation 
of the General Duty Clause where exposures were below a chemical-
specific permissible exposure limit (PEL), a TWA based on an employee's 
average airborne exposure in any 8-hour work shift of a 40-hour work 
week which shall not be exceeded (Ref. 10). In such situations, OSHA 
must demonstrate that the employer had actual knowledge that the PEL 
was inadequate to protect its employees from death or serious physical 
harm. Because of the heavy evidentiary burden on OSHA to establish 
violations of the General Duty Clause, it is not frequently used to 
cite employers for employee exposure to chemical hazards.
b. OSHA Standards
    OSHA standards are issued pursuant to the OSH Act and are found in 
title 29 of the CFR. There are separate standards for general industry, 
laboratories, construction, maritime and agriculture sectors, and 
general standards applicable to a number of sectors (e.g., OSHA's 
Respiratory Protection standard). OSHA has numerous standards that 
apply to employers who operate chemical manufacturing and processing 
facilities, as well as to downstream employers whose employees may be 
occupationally exposed to hazardous chemicals.
    OSHA sets legally enforceable limits on the airborne concentrations 
of hazardous chemicals, referred to as PELs, established for employers 
to protect their workers against the health effects of exposure to 
hazardous substances (29 CFR part 1910, subpart Z, part 1915, subpart 
Z, and part 1926, subparts D and Z). Under section 6(a) of the OSH Act, 
OSHA was permitted an initial 2-year window after the passage of the 
Act to adopt ``any national consensus standard and any established 
Federal standard.'' 29 U.S.C. 655(a). OSHA used this authority in 1971 
to establish PELs that were adopted from Federal health standards 
originally set by the Department of Labor through the Walsh-Healy Act, 
in which approximately 400 occupational exposure limits (OELs) were 
selected based on the American Conference of Governmental Industrial 
Hygienists (ACGIH) 1968 list of Threshold Limit Values (TLVs). In 
addition, about 25 exposure limits recommended by the American 
Standards Association (now called the American National Standards 
Institute or ANSI) were adopted as PELs.
    Following the 2-year window provided under section 6(a) of the OSH 
Act for adoption of national consensus and existing Federal standards, 
OSHA has issued health standards following the requirements in section 
6(b) of the Act. OSHA has established approximately 30 PELs under 
section 6(b)(5) as part of comprehensive substance-specific standards 
that include additional requirements for protective measures such as 
use of PPE, establishment of regulated areas, exposure assessment, 
hygiene facilities, medical surveillance, and training. These ancillary 
provisions in substance-specific OSHA standards further mitigate 
residual risk that could be present due to exposure at the PEL.
    Many OSHA PELs have not been updated since they were established in 
1971, including the PEL for TCE. In many instances, scientific evidence 
has accumulated suggesting that the current limits of many PELs are not 
sufficiently protective. On October 10, 2014, OSHA published a Federal 
Register document in which it recognized that many of its PELs are 
outdated and inadequate for ensuring protection of worker health (79 FR 
61384). In addition, health standards issued under section 6(b)(5) of 
the OSH Act must reduce significant risk only to the extent that it is 
technologically and economically feasible. OSHA's legal requirement to 
demonstrate that its section 6(b)(5) standards are technologically and 
economically feasible at the time they are promulgated often precludes 
OSHA from imposing exposure control requirements sufficient to ensure 
that the chemical substance no longer presents a significant risk to 
workers. As described in that document, while new advancements or 
developments in science and technology from the time a PEL is 
promulgated may improve the scientific basis for making findings of 
significant risk, technical feasibility or economic feasibility, OSHA 
has been unable to update most of the PELs established in 1971 and they 
remain at levels at which they were initially adopted (79 FR 61384, 
October 10, 2014). One example of how industries have evolved in the 
intervening 50 years as to what is technologically and economically 
feasible is the halogenated solvent cleaning industry, which, in 
response to EPA's National Emission Standards for Hazardous Air 
Pollutants (NESHAP) promulgated under section 112 of the 1990 Clean Air 
Act Amendments (see National Emissions Standards for Halogenated 
Solvent Cleaning, 40 CFR part 63, subpart T), has made equipment 
improvements that conserve solvent resources and reduce workplace 
exposure.
    In sum, the great majority of OSHA's chemical standards are 
outdated or do not sufficiently reduce risk to workers. While it is 
possible in some cases that the OSHA standards for some chemicals 
reviewed under TSCA will eliminate unreasonable risk, based on EPA's 
experience thus far in conducting occupational risk assessments under 
TSCA, EPA believes that OSHA chemical standards would in general be 
unlikely to address unreasonable risk to workers within the meaning of 
TSCA, since TSCA section 6(b) unreasonable risk determinations may 
account for unreasonable risk to more sensitive endpoints (derived from 
scientific

[[Page 74720]]

studies that had not yet been conducted at the time OSHA promulgated 
its standards) and working populations than OSHA's risk evaluations 
typically contemplate, and EPA is obligated to apply TSCA section 6(a) 
risk management requirements to the extent necessary so that the 
unreasonable risk is no longer presented.
    Because the requirements and application of TSCA and OSHA 
regulatory analyses differ, and because OSHA's chemical-specific 
standards are decades old and may include outdated assumptions 
regarding the most sensitive end-point and/or the technological and 
economic feasibility of the standards, it is necessary for EPA to 
conduct risk evaluations and, where it finds unreasonable risk to 
workers, develop risk management requirements for chemical substances 
that OSHA also regulates, and it is expected that EPA's findings and 
requirements may sometimes diverge from OSHA's. However, it is also 
appropriate that EPA consider the chemical standards that OSHA has 
already developed to limit the compliance burden to employers by 
aligning management approaches required by the agencies, where 
alignment will adequately address unreasonable risk to workers. Unit 
II.C.2. discusses EPA's consideration of OSHA standards in its risk 
evaluation and management strategies under TSCA.
2. Consideration of OSHA Standards in TSCA Risk Evaluations
    When characterizing the risk during risk evaluation under TSCA, EPA 
believes it is appropriate to evaluate the levels of risk present in 
scenarios where no mitigation measures are assumed to be in place for 
the purpose of determining unreasonable risk (see Unit II.C.2.a.). 
However, the Agency acknowledges that, in some cases, mitigation 
measures are already in place. It should be noted that there are some 
cases where scenarios may reflect certain mitigation measures, such as 
(e.g., in instances where exposure estimates are based on monitoring 
data at facilities that have existing engineering controls in place). 
For example, the Halogenated Solvent Cleaning NESHAP, first promulgated 
in 1994 and last updated in 2007, established standards reflecting the 
maximum achievable control technology for major and certain area 
sources, standards reflecting generally available control technology 
for other area sources, and facility-wide emission limits for certain 
halogenated solvent cleaning machines. Consequently, emissions 
monitoring from facilities meeting the NESHAP would reflect emissions 
reduction resulting from existing engineering controls already in place 
to meet the standards.
    In addition, EPA believes it may be appropriate to also evaluate 
the levels of risk present in scenarios considering applicable OSHA 
requirements as well as scenarios considering industry or sector best 
practices for industrial hygiene that are clearly articulated to the 
Agency. EPA may evaluate risk under scenarios that consider industry or 
sector best practices for industrial hygiene that are clearly 
articulated to the Agency, when doing so serves to inform its risk 
management efforts. Characterizing risks using scenarios that reflect 
different levels of mitigation can help inform potential risk 
management actions by providing information that could be used during 
risk management to tailor risk mitigation appropriately to address any 
unreasonable risk identified (see Unit II.C.2.b. and Unit II.C.3.).
a. Risk Characterization for Unreasonable Risk Determination
    When making unreasonable risk determinations as part of TSCA risk 
evaluations, EPA cannot assume as a general matter that all workers are 
always equipped with and appropriately using sufficient PPE, although 
EPA does not question the veracity of public comments received on the 
2020 Risk Evaluation for TCE regarding the occupational safety 
practices often followed by industry respondents. When characterizing 
the risk to human health from occupational exposures during risk 
evaluation under TSCA, EPA believes it is appropriate to evaluate the 
levels of risk present in scenarios where PPE is not assumed to be used 
by workers. This approach of not assuming PPE use by workers considers 
the risk to PESS (workers and occupational non-users (ONUs)) who may 
not be covered by OSHA standards, such as self-employed individuals and 
public sector workers who are not covered by a State Plan. Mitigation 
scenarios included in the EPA risk evaluation (e.g., scenarios 
considering use of PPE) likely represent current practice in many 
facilities where companies effectively address worker and bystander 
safety requirements. However, the Agency cannot assume that all 
facilities across all uses of the chemical substance will have adopted 
these practices for the purposes of making the TSCA risk determination.
    Therefore, EPA makes its determinations of unreasonable risk based 
on scenarios that do not assume compliance with OSHA standards, 
including any applicable exposure limits or requirements for use of 
respiratory protection or other PPE. Making unreasonable risk 
determinations based on such scenarios should not be viewed as an 
indication that EPA believes there are no occupational safety 
protections in place at any location, or that there is widespread 
noncompliance with applicable OSHA standards. Rather, it reflects EPA's 
recognition that unreasonable risk may exist for subpopulations of 
workers that may be highly exposed because they are not covered by OSHA 
standards, such as self-employed individuals and public sector workers 
who are not covered by an OSHA State Plan, or because their employer is 
out of compliance with OSHA standards, or because EPA finds 
unreasonable risk for purposes of TSCA notwithstanding existing OSHA 
requirements.
b. Risk Evaluation To Inform Risk Management Requirements
    In addition to the scenarios described previously, EPA risk 
evaluations may characterize the levels of risk present in scenarios 
considering applicable OSHA requirements (e.g., chemical-specific PELs 
and/or chemical-specific health standards with PELs and additional 
ancillary provisions) as well as scenarios considering industry or 
sector best practices for industrial hygiene that are clearly 
articulated to the Agency to help inform risk management decisions.
3. Consideration of OSHA Standards in TSCA Risk Management Actions
    When undertaking risk management actions, EPA: (1) Develops 
occupational risk mitigation measures to address any unreasonable risk 
identified by EPA, striving for compatibility with applicable OSHA 
requirements and industry best practices, including appropriate 
application of the hierarchy of controls, when those measures would 
address an unreasonable risk; and (2) Ensures that EPA requirements 
apply to all potentially exposed workers in accordance with TSCA 
requirements. Consistent with TSCA section 9(d), EPA consults and 
coordinates TSCA activities with OSHA and other relevant Federal 
agencies for the purpose of achieving the maximum applicability of TSCA 
while avoiding the imposition of duplicative requirements.
    Informed by the mitigation scenarios and information gathered 
during the risk evaluation and risk management process, the Agency 
might propose rules that require risk management practices that may be 
already common practice in many or most facilities. Adopting clear, 
broadly applicable regulatory standards will foster compliance across 
all

[[Page 74721]]

facilities (ensuring a level playing field) and assure protections for 
all affected workers, especially in cases where current OSHA standards 
may not apply to them or not be sufficient to address the unreasonable 
risk.
    For evaluation scenarios which involve OSHA chemical-specific PELs, 
EPA's risk evaluation in some cases may illustrate that limiting 
exposure to OSHA's PEL would result in acceptable levels of risk under 
TSCA under certain conditions of use. In these cases, TSCA risk 
management requirements could incorporate and reinforce requirements in 
OSHA standards and ensure that risks are addressed, including for 
circumstances where OSHA requirements are not applicable (e.g., public 
sector workers not covered by an OSHA State plan, and self-employed 
workers) by asserting TSCA compliance/enforcement as well. EPA's risk 
evaluation may also find unreasonable risk under TSCA associated with 
some occupational conditions of use (see Unit III.B.1.f.), even when 
the applicable OSHA requirements are being met. In these cases, EPA 
would need to develop risk management requirements beyond those 
included in OSHA's standards.
4. TCE and OSHA Requirements
    EPA incorporated the considerations described in Unit II.C. into 
the 2020 Risk Evaluation for TCE, the January 2023 revised unreasonable 
risk determination for TCE, and this rulemaking. Specifically, in the 
TSCA 2020 Risk Evaluation for TCE, EPA presented risk estimates based 
on workers' exposures with and without respiratory protection. EPA 
determined that even when respirators are used by workers, most of the 
conditions of use evaluated drove the unreasonable risk. Additional 
consideration of OSHA standards in the revised unreasonable risk 
determination is discussed further in the Federal Register document 
announcing that document (Ref. 11). In Unit III.B.3. and Unit 
V.A.2.b.iii., EPA outlines the importance of considering the hierarchy 
of controls used by the industrial hygiene community (hereafter 
referred to as ``hierarchy of controls'') when developing risk 
management actions in general, and specifically when determining if and 
how regulated entities may meet a risk-based exposure limit for TCE. 
The hierarchy of controls is a prioritization of exposure control 
strategies from most preferred to least preferred techniques. The 
control strategies include elimination of the hazard, substitution with 
a less hazardous substance, engineering controls, administrative 
controls such as training or exclusion zones with warning signs, and, 
finally, use of PPE (Ref. 12). Under the hierarchy of controls, the use 
of respirators and dermal PPE should only be considered after all other 
steps have been taken to reduce exposures. As discussed in Units V.A. 
and VI.A.1., EPA's risk management approach would not rely solely or 
primarily on the use of respirators and dermal PPE to address 
unreasonable risk to workers; instead, EPA is proposing prohibitions 
for all conditions of use, with a WCPP for certain occupational 
conditions of use before the prohibitions are fully implemented. The 
WCPP would require consideration of the hierarchy of controls before 
use of respirators and other PPE. The WCPP is discussed in full in 
Units V.A.2. and VI.A.1.b.
    In accordance with the approach described in Unit II.C.3., EPA 
intends for this regulation to be as compatible as possible with the 
existing OSHA standards, with additional requirements as necessary to 
address the unreasonable risk. One notable difference between the WCPP 
and the OSHA standards are the exposure limits. The WCPP would include 
an ECEL of either 0.0011 ppm (1.1 ppb) or 0.0040 ppm (4.0 ppb) as an 8-
hour TWA; exposures at or below each ECEL would not result in 
unreasonable risk for chronic cancer and non-cancer and acute non-
cancer inhalation endpoints (See Unit IV.A. for further discussion 
about an ECEL of 0.0011 ppm and Unit IV.B. for further discussion about 
an ECEL of 0.0040 ppm. Refer to Unit VI.A. for discussion about why EPA 
is considering two TCE ECELs and EPA's related request for public 
comment). EPA recognizes that for TCE, either ECEL would be 
significantly lower than the OSHA PEL (100 ppm as an 8-hour TWA). In 
addition to the distinctions in statutory requirements described in 
this unit, EPA has identified several factors contributing to the 
differences in these levels, outlined here.
    The TSCA ECEL value for TCE is a lower value than the OSHA PEL (and 
other existing OELs, discussed in Unit II.C.5.) for many reasons, 
including that the PEL, established in 1971, may not fully capture 
either the complete database of studies considered in the 2020 Risk 
Evaluation for TCE or more recent advances in modeling and scientific 
interpretation of toxicological data applied in the calculation of the 
TCE ECEL. The proposed numeric ECEL values considered for incorporation 
into the WCPP are derived from the analysis in the 2020 Risk Evaluation 
for TCE, which EPA considers to represent the best available science 
under TSCA section 26(h) because it was subject to peer review and is 
the result of a systematic review process that considered reasonably 
available information in order to identify relevant adverse health 
effects. Additionally, by using the information from the 2020 Risk 
Evaluation for TCE, the ECEL incorporates advanced modeling and peer-
reviewed methodologies, and accounts for exposures to potentially 
exposed and susceptible subpopulations, as required by TSCA.
    For TCE, the EPA ECEL is an 8-hour occupational inhalation exposure 
limit, and it takes into consideration the uncertainties identified in 
the 2020 Risk Evaluation for TCE. For TCE, EPA derived two distinct 
ECEL values.
    The ECEL of 0.0011 ppm is based on the most sensitive overall human 
health endpoint of developmental toxicity, specifically, fetal cardiac 
defects based on rat data from Johnson et al., 2003 (Refs. 1, 13). It 
represents the concentration at which an individual, including a member 
of a PESS, especially older pregnant workers and ONUs (the group 
identified as most susceptible to cardiac defects in their developing 
fetus based on epidemiological data), would be unlikely to suffer 
adverse effects if exposed for a single 8-hr workday. This value is 
also protective of health effects that could present following chronic 
or lifetime exposures under typical occupational exposure scenarios. 
The ECEL of 0.0011 ppm incorporates a benchmark margin of exposure of 
10 to account for inter- and intra-species toxicodynamic variability. 
In addition to the ECEL, as part of this rulemaking, EPA is proposing 
an ECEL action level, which is a value equal to half of the ECEL, that 
would trigger additional monitoring to ensure that workers are not 
exposed to concentrations above the ECEL. Exposure monitoring and 
establishing a baseline of TCE exposure for potentially exposed 
persons, as well as identifying the lowest achievable exposure level in 
a facility, is further discussed in Unit V.A.2.
    The ECEL of 0.0040 ppm is based on chronic autoimmunity, 
representing the most protective exposure limit from the best overall 
acute and chronic non-cancer endpoints under TSCA of immunosuppression 
and autoimmunity, respectively (Refs. 14, 46, 1). The ECEL of 0.0040 
ppm is based on elevated anti-double stranded DNA (anti-dsDNA) and 
single-stranded DNA (ssDNA) antibodies following chronic exposure based 
on mouse data from Keil et al, 2009 (Ref. 1). The ECEL based on 
autoimmunity was derived from the PBPK model-adjusted assumptions of 8-

[[Page 74722]]

hour daily exposure and elevated respiratory rate for workers, and it 
incorporates a benchmark MOE of 30 to account for inter- and intra-
species toxicodynamic variability as well as the absence of a no-effect 
level in the study (Ref. 1).
    The OSHA PEL for TCE of 100 ppm as an 8-hour TWA was established in 
1971. OSHA is required to promulgate a standard that reduces 
significant risk to the extent that it is technologically and 
economically feasible to do so (81 FR 16285) at the time of 
promulgation. As part of a 1989 air contaminants standard for 428 toxic 
substances, OSHA lowered the PEL to 50 ppm based on a quantitative 
cancer risk assessment and technological feasibility analysis (See 54 
FR 2332, 2432(1989)). This rulemaking was later vacated by court order, 
which held that OSHA failed to establish that: (1) the existing PELs 
presented a significant risk of material health impairment; (2) the new 
standards eliminated or substantially lessened the risk; and (3) the 
new PELs were economically or technologically feasible (Ref. 15). As a 
result, the PEL for TCE reverted to the original PEL of 100 ppm. The 
basis of the 100 ppm PEL is unclear; however, most original PELs were 
based on acute health effects only observable at higher concentrations 
and did not take into account more sensitive repeated dose studies, 
including the studies used to inform the TCE ECEL, that were not 
available at the time the PEL was established (see, e.g., 79 FR 61383, 
61388). As discussed in Units II.D., III.B., and VIII.D., the TSCA 
ECELs for the TCE WCPP are based on the 2020 Risk Evaluation for TCE 
and represent the best available science. As described in Unit II.C.1., 
in a 2014 request for information OSHA described how, while new 
developments in science and technology from the time the PEL for TCE 
was established in 1971 may improve the scientific basis for making 
findings of significant risk, technical feasibility, or economic 
feasibility that is required under section 6(b)(5) of the OSH Act, OSHA 
has been unable to update the PEL for TCE and it remains at the level 
that was originally adopted in 1971 (79 FR 61383, October 10, 2014).
5. TCE and Other Occupational Exposure Limits
    EPA is aware of other OELs for TCE, including the ACGIH TLV, the 
California Division of Occupational Safety and Health (Cal/OSHA) PEL, 
and the National Institute for Occupational Safety and Health (NIOSH) 
Recommended Exposure Limit (REL).
    The 8-hour TWA TLV currently recommended by the ACGIH is 10 ppm, 
based on a most recent update in 2007. This TLV is based on central 
nervous system (CNS) effects occurring at 100 ppm and above (Ref. 16). 
Kidney toxicity, cancer, and developmental toxicity were also indicated 
at high doses. Overall, the 10 ppm TLV does not seem to be directly 
derived from any particular endpoint and can be considered only a semi-
quantitative estimate. The TLV report did not cite either the immune 
study used as the basis of EPA's alternative ECEL of 0.0040 ppm (Keil 
et al., 2009), nor did it cite Johnson et al., 2003, which is the basis 
of EPA's proposed ECEL of 0.0011 ppm. Notably, the most recent TLV 
report was released prior to publication of Keil et al., 2009, and the 
TLV was not directly derived from any particular endpoint or hazard 
value. Among other cited studies that are discussed in the 2020 Risk 
Evaluation, the TLV report only discusses LOAELs and did not apply 
benchmark dose modeling, PBPK modeling, or any uncertainty factors that 
would have contributed to a reduced exposure limit. The report does 
identify TCE as a suspected human carcinogen and discusses 
epidemiological evidence for several cancers, but there is no 
consideration of low-dose linear extrapolation that would have resulted 
in a substantially lower TLV.
    The current NIOSH REL is based on the ``lowest feasible level'' 
standard applied to carcinogens, labeled as ``Ca (potential 
occupational carcinogen), minimize exposure concentrations'' (Ref. 17), 
as well as a 2 ppm 60-minute ceiling REL value when used as an 
anesthetic agent and a 25 ppm 10-hour TWA REL for other exposures. As 
described in NIOSH's Appendix A, the non-quantitative value applied to 
carcinogens is based on the lowest feasible concentration (Ref. 18). 
The 25 ppm TWA was based on concerns for CNS effects at higher doses 
and a review of industrial hygiene reports supporting the feasibility 
of a 25-ppm limit. Notably, this ceiling limit is from 1990, over a 
decade before publication of any of the key studies EPA used for risk 
determination or ECEL derivation.
    The 2007 Cal/OSHA PEL is 25 ppm, lower than the OSHA PEL and 
equivalent to the NIOSH REL TWA (Ref. 19). According to Cal/OSHA, the 
origin of the Cal/OSHA PEL is not clear but is assumed to be based on 
the NIOSH REL threshold value, which cited CNS effects and liver cancer 
in animals (Ref. 20).

D. Summary of EPA's Risk Evaluation Activities on TCE

    In December 2016, EPA selected TCE as one of the first 10 chemicals 
for risk evaluation under TSCA section 6 (15 U.S.C. 2605) (81 FR 91927, 
December 19, 2016) (FRL-9956-47). EPA published the scope of the TCE 
risk evaluation (82 FR 31592, July 7, 2017) (FRL-9963-57), and, after 
receiving public comments, published the problem formulation in June 
2018 (83 FR 26998, June 11, 2018) (FRL-9978-40). In February 2020, EPA 
published a draft risk evaluation (85 FR 11079, February 26, 2020) 
(FRL-10005-52), and after public comment and peer review by the Science 
Advisory Committee on Chemicals (SACC), EPA issued the 2020 Risk 
Evaluation for TCE in November 2020 in accordance with TSCA section 
6(b) (85 FR 75010, November 24, 2020) (FRL-10016-91). EPA subsequently 
issued a draft revised TSCA unreasonable risk determination for TCE (87 
FR 40520, July 7, 2022) (FRL-9945-01-OCSPP) and after public notice and 
receipt of comments, published a final revised Unreasonable Risk 
Determination for TCE in January 2023 (88 FR 1222, January 9, 2023) 
(FRL-9945-02-OCSPP). The 2020 Risk Evaluation for TCE and supplemental 
materials are in docket EPA-HQ-OPPT-2019-0500, with the January 2023 
final revised unreasonable risk determination and additional materials 
supporting the risk evaluation process in docket EPA-HQ-OPPT-2016-0737, 
on https://www.regulations.gov.
1. 2020 Risk Evaluation
    In the 2020 Risk Evaluation for TCE, EPA evaluated risks associated 
with 54 conditions of use within the following categories: manufacture 
(including import), processing, distribution in commerce, industrial 
and commercial use, consumer use, and disposal (Ref. 1). Descriptions 
of these conditions of use are in Unit III.B.1.
    The 2020 Risk Evaluation for TCE identified significant adverse 
health effects associated with short- and long-term exposure to TCE, 
including non-cancer effects (immunosuppression and developmental 
toxicity) from acute inhalation exposures and dermal exposures, and 
non-cancer effects (liver toxicity, kidney toxicity, neurotoxicity, 
autoimmunity, reproductive toxicity, and developmental toxicity) and 
cancer (liver, kidney, and non-Hodgkin lymphoma) from chronic 
inhalation exposures to TCE. A further discussion of the hazards of TCE 
is in Unit III.B.2.
    In the 2020 Risk Evaluation for TCE, EPA documented its 
unreasonable risk

[[Page 74723]]

policy determination for TCE and based it on the immunotoxicity 
endpoint rather than the most sensitive endpoint (developmental 
toxicity). The 2020 Risk Evaluation for TCE included a robust 
scientific description of the developmental toxicity endpoint, 
specifically fetal cardiac defects, and the analysis in the risk 
evaluation supporting the developmental toxicity endpoint noted that 
this endpoint presents lower PODs (Ref. 1). EPA identified the risk of 
fetal cardiac defects most strongly associated with offspring of older 
mothers, and therefore included risk estimates for fetal cardiac 
defects that account for susceptible mothers and their offspring in 
addition to PESS groups with other susceptibilities (e.g., diabetes, 
infection status, drug exposure, stress, and metabolic sensitivity due 
to increased enzymatic activity of cytochrome P450 2E1 (CYP2E1)) (Ref. 
1). EPA recognizes that there are differing views about the 
appropriateness of EPA's policy decision in 2020 to use the 
immunotoxicity endpoint as the basis for EPA's unreasonable risk 
determination. EPA also notes that the endpoint selected as the basis 
for the TSCA section 6 unreasonable risk determination in the risk 
evaluation that is the basis for this proposed rule should not 
necessarily be construed as appropriate for or consistent with the 
basis for other Agency assessments such as the Integrated Risk 
Information System (IRIS) assessment for TCE or for actions taken by 
other agency programs. Further, EPA has received numerous comments on 
EPA's 2020 TSCA Risk Evaluation policy choice regarding endpoint 
selection that have raised concerns pertaining to political 
interference and scientific integrity, among other issues. In 
recognition of this history, EPA is therefore requesting comment on the 
use of the more sensitive developmental toxicity endpoint to inform TCE 
risk management decisions. In particular, EPA notes that this proposed 
rule for regulating the unreasonable risk of TCE demonstrates that both 
the immunotoxicity and developmental toxicity endpoints support the 
proposed prohibitions, discussed in detail in Unit IV.
2. Revised Unreasonable Risk Determination
    EPA has been revisiting specific aspects of its first ten TSCA 
existing chemical risk evaluations, including the 2020 Risk Evaluation 
for TCE, to ensure that the risk evaluations upon which risk management 
decisions are made better align with TSCA's objective of protecting 
human health and the environment. For TCE, EPA revised the original 
unreasonable risk determination based on the 2020 Risk Evaluation for 
TCE and issued a final revised unreasonable risk determination in 
January 2023 (Ref. 2). EPA revised the risk determination for the 2020 
Risk Evaluation for TCE pursuant to TSCA section 6(b) and Executive 
Order 13990, (entitled ``Protecting Public Health and the Environment 
and Restoring Science to Tackle the Climate Crisis'') and other 
Administration priorities (Refs. 21, 22, 23). The revisions consisted 
of making the risk determination for the whole chemical substance 
rather than for individual conditions of use (which resulted in the 
revised risk determination superseding the prior ``no unreasonable 
risk'' determinations and withdrawing the associated TSCA section 
6(i)(1) ``no unreasonable risk'' order); and clarifying that the risk 
determination does not reflect an assumption that all workers are 
always provided and appropriately wear PPE. (Ref. 2).
    In determining whether TCE presents unreasonable risk under the 
conditions of use, EPA considered relevant risk-related factors, 
including, but not limited to: the effects of the chemical substance on 
health (including cancer and non-cancer risks) and human exposure to 
the substance under the conditions of use (including duration, 
magnitude, and frequency of exposure); the effects of the chemical 
substance on the environment and environmental exposure under the 
conditions of use; the population exposed (including any PESS); the 
severity of hazard (including the nature of the hazard, the 
irreversibility of the hazard); and uncertainties.
    EPA determined that TCE presents an unreasonable risk of injury to 
health. The unreasonable risk determination, based on immunotoxicity 
and cancer, is driven by risks to workers and ONUs (workers who do not 
directly handle the chemical but perform work in an area where the 
chemical is present) due to occupational exposures to TCE (i.e., during 
manufacture, processing, industrial and commercial uses, and disposal); 
and to consumers and bystanders associated with consumer uses of TCE 
due to exposures from consumer use of TCE and TCE-containing products. 
Though the revised unreasonable risk determination was based on cancer 
and the best overall non-cancer endpoints for use in risk evaluation 
under TSCA (immunosuppression effects for acute inhalation and dermal 
exposures, and autoimmunity effects for chronic inhalation and dermal 
exposures), consistent with the 2020 Risk Evaluation for TCE, the 
Agency is proposing to base the risk management requirements for the 
WCPP on a more sensitive endpoint to account for particular health 
effects identified in the underlying 2020 Risk Evaluation for TCE 
relevant to PESS, as discussed in Unit IV.A. and V.A.2.
    EPA did not identify unreasonable risk of injury to the environment 
for TCE. The TCE conditions of use that EPA evaluated and whose risk 
support EPA's determination that the chemical substance poses 
unreasonable risk to health, are listed in the unreasonable risk 
determination (Ref. 2) and also in Unit III.B.
3. Fenceline Screening Analysis
    The 2020 Risk Evaluation for TCE excluded the assessment of certain 
exposure pathways that were or could be regulated under another EPA-
administered statute (see section 1.4.2 of the November 2020 Risk 
Evaluation for TCE (Ref. 1). This resulted in the surface water, 
drinking water, and ambient air pathways for TCE exposure not being 
assessed for human health risk to the general population. In June 2021, 
EPA made a policy announcement on the path forward for TSCA chemical 
risk evaluations, indicating that EPA would, among other things, 
examine whether the exclusion of certain exposure pathways from the 
risk evaluations could lead to a failure to adequately protect 
fenceline communities (Ref. 24). EPA then conducted a screening 
analysis to identify whether there may be risks to people living near 
the fenceline of facilities releasing TCE.
    In order to assess whether there are no risks of concern or whether 
there may be risks of concern to the general population in proximity to 
a facility releasing TCE, EPA developed the TSCA Screening Level 
Approach for Assessing Ambient Air and Water Exposures to Fenceline 
Communities Version 1.0, which was presented to the SACC in March 2022, 
with a report issued by the SACC on May 18, 2022 (Ref. 25). This 
screening level approach, which EPA believes is very effective in 
accurately assessing where fenceline exposures are of no concern is 
discussed in Unit VII.A.

III. Regulatory Approach

A. Background

    Under TSCA section 6(a), if the Administrator determines, through a 
TSCA section 6(b) risk evaluation that the manufacture (including 
import), processing, distribution in commerce, use, or disposal of a 
chemical substance

[[Page 74724]]

or mixture, or any combination of such activities, presents an 
unreasonable risk of injury to health or the environment, EPA must by 
rule apply one or more of the following requirements to the extent 
necessary so that the chemical substance or mixture no longer presents 
such risk.
     Prohibit or otherwise restrict the manufacturing, 
processing, or distribution in commerce of the substance or mixture, or 
limit the amount of such substance or mixture which may be 
manufactured, processed, or distributed in commerce (TSCA section 
6(a)(1)).
     Prohibit or otherwise restrict the manufacturing, 
processing, or distribution in commerce of the substance or mixture for 
a particular use or above a specific concentration for a particular use 
(TSCA section 6(a)(2)).
     Limit the amount of the substance or mixture which may be 
manufactured, processed, or distributed in commerce for a particular 
use or above a specific concentration for a particular use specified 
(TSCA section 6(a)(2)).
     Require clear and adequate minimum warning and 
instructions with respect to the substance or mixture's use, 
distribution in commerce, or disposal, or any combination of those 
activities, to be marked on or accompanying the substance or mixture 
(TSCA section 6(a)(3)).
     Require manufacturers and processors of the substance or 
mixture to make and retain certain records or conduct certain 
monitoring or testing (TSCA section 6(a)(4)).
     Prohibit or otherwise regulate any manner or method of 
commercial use of the substance or mixture (TSCA section 6(a)(5)).
     Prohibit or otherwise regulate any manner or method of 
disposal of the substance or mixture, or any article containing such 
substance or mixture, by its manufacturer or processor or by any person 
who uses or disposes of it for commercial purposes (TSCA section 
6(a)(6)).
     Direct manufacturers or processors of the substance or 
mixture to give notice of the unreasonable risk determination to 
distributors, certain other persons, and the public, and to replace or 
repurchase the substance or mixture (TSCA section 6(a)(7)).
    As described in Unit III.B.3., EPA analyzed how the TSCA section 
6(a) requirements could be applied to address the unreasonable risk, so 
that TCE no longer presents such unreasonable risk. EPA's proposed 
regulatory action and a primary alternative regulatory action are 
described in Unit V. EPA is requesting public comment on all elements 
of the proposed regulatory action and the alternative regulatory action 
and is providing notice that based on consideration of comments and any 
new information submitted to EPA during the comment period on this 
proposed rule, EPA may in the final rule modify elements of the 
proposed regulatory action. The public should understand that public 
comments could result in changes to elements of the proposed and 
alternative regulatory actions when this rulemaking is finalized. For 
example, elements such as timeframes for phase out could be lengthened 
or shortened, ECELs could be modified, or the WCPP could have 
conditions added or eliminated.
    Under the authority of TSCA section 6(g), EPA may consider granting 
a time-limited exemption from a requirement of a TSCA section 6(a) rule 
for a specific condition of use if EPA finds that: (1) The specific 
condition of use is a critical or essential use for which no 
technically and economically feasible safer alternative is available, 
taking into consideration hazard and exposure; (2) Compliance with the 
requirement, as applied with respect to the specific condition of use, 
would significantly disrupt the national economy, national security, or 
critical infrastructure; or (3) The specific condition of use, as 
compared to reasonably available alternatives, provides a substantial 
benefit to health, the environment, or public safety. Based on 
reasonably available information, EPA has analyzed the need for an 
exemption and has found that TSCA section 6(g) exemptions are warranted 
for certain conditions of use, as detailed in Unit V.A.3. EPA is 
requesting public comment regarding the need for exemptions from the 
rule (and under what specific circumstances), including exemptions from 
the proposed regulatory action and the primary alternative regulatory 
action, pursuant to the provisions of TSCA section 6(g).
    TSCA section 6(c)(2)(A) requires EPA, in proposing and promulgating 
TSCA section 6(a) rules, to consider and include a statement addressing 
certain factors, including the costs and benefits and the cost 
effectiveness of the regulatory action and of the one or more primary 
alternative regulatory actions considered by the Administrator. A 
description of all TSCA section 6 requirements considered in developing 
this proposed regulatory action is in Unit III.B.3., and Unit VI.B. 
includes more information regarding EPA's consideration of exemptions 
and alternatives. TSCA section 6(c)(2)(C) requires that, in deciding 
whether to prohibit or restrict in a manner that substantially prevents 
a specific condition of use and in setting an appropriate transition 
period for such action, EPA consider, to the extent practicable, 
whether technically and economically feasible alternatives that benefit 
health or the environment will be reasonably available as substitutes 
when the proposed prohibition or restriction takes effect. Unit VI.B. 
includes more information regarding EPA's consideration of 
alternatives, and Units IV. and VII. provide more information on EPA's 
considerations more broadly under TSCA section 6(c)(2).
    EPA carried out required consultations as described in this unit 
and also considered impacts on children's environmental health as part 
of its approach to developing this TSCA section 6 regulatory action.
1. Consultations
    EPA conducted consultations and outreach in developing this 
proposed regulatory action. The Agency held a federalism consultation 
from July 22, 2021, until October 22, 2021, as part of this rulemaking 
process and pursuant to Executive Order 13132. This included a 
background presentation on September 9, 2021, and a consultation 
meeting on July 22, 2021. During the consultation, EPA met with State 
and local officials early in the process of developing the proposed 
action in order to receive meaningful and timely input into its 
development (Ref. 26). During the consultation, participants and EPA 
discussed preemption; the authority given under TSCA section 6 to 
regulate identified unreasonable risk; which activities would be 
potentially regulated in the proposed rule; TSCA reporting 
requirements; key local constituencies; and the relationship between 
TSCA and existing statutes, particularly the Clean Water Act (CWA) and 
the Safe Drinking Water Act (SDWA) (Ref. 26).
    TCE is not manufactured (including imported), processed, 
distributed in commerce, or regulated by Tribal governments. However, 
EPA consulted with Tribal officials during the development of this 
proposed action (Ref. 27). The Agency held a Tribal consultation from 
May 17, 2021, to August 20, 2021, with meetings on June 15 and July 8, 
2021. Tribal officials were given the opportunity to meaningfully 
interact with EPA risk managers concerning the current status of risk 
management. During the consultation, participants and EPA discussed 
concerns from Tribal members about the TCE OSHA exposure limit being 
outdated, Tribal interest in seeing TCE

[[Page 74725]]

banned, and concerns that third party disposal may be occurring near 
Tribal lands, with a particular interest in protecting workers at 
publicly owned treatment works (Ref. 27). EPA received no written 
comments as part of this consultation.
    In addition to the formal consultations, EPA also conducted 
outreach to advocates of communities that might be subject to 
disproportionate risk from the exposures to TCE, such as communities 
with environmental justice concerns. EPA's Environmental Justice (EJ) 
consultation occurred from June 3, 2021, through August 20, 2021. On 
June 16 and July 6, 2021, EPA held public meetings as part of this 
consultation. These meetings were held pursuant to Executive Orders 
12898 and 14008. EPA received three written comments following the EJ 
meetings, in addition to oral comments provided during the consultation 
(Refs. 28, 29, 30). In general, commenters supported strong regulation 
of TCE to protect lower-income communities and workers, strong outreach 
to affected communities, encouraged EPA to follow the National 
Institute for Occupational Safety and Health (NIOSH) hierarchy of 
controls, favored prohibitions, and noted the uncertainty, and, in some 
cases, inadequacy, of personal protective equipment (Ref. 31).
    As required by section 609(b) of the Regulatory Flexibility Act 
(RFA), EPA convened a Small Business Advocacy Review (SBAR) Panel to 
obtain advice and recommendations from small entity representatives 
(SERs) that potentially would be subject to this proposed rule's 
requirements (Ref. 32). EPA met with SERs before and during Panel 
proceedings, on October 28, 2022, and January 31, 2023. Panel 
recommendations are in Unit XI.C. and in the Initial Regulatory 
Flexibility Analysis (Ref. 33), the Panel report is in the docket (Ref. 
32).
    Units XI.C., XI.E., XI.F., and XI.J. provide more information 
regarding the consultations.
2. Other Stakeholder Engagement
    In addition to the formal consultations described in Unit XI., EPA 
held a webinar on December 15, 2020, providing an overview of the TSCA 
risk management process and the risk evaluation findings for TCE. EPA 
also presented on the risk evaluation and risk management under TSCA 
for TCE at a Small Business Administration small business roundtable on 
December 18, 2020. At both events EPA staff provided an overview of the 
TSCA risk management process and the findings in the 2020 Risk 
Evaluation for TCE (Ref. 34). Attendees of these meetings were given an 
opportunity to voice their concerns regarding the risk evaluation and 
risk management.
    Furthermore, EPA engaged in discussions with representatives from 
different industries, non-governmental organizations, technical experts 
and users of TCE. A list of external meetings held during the 
development of this proposed rule is in the docket (Ref. 35); meeting 
materials and summaries are also in the docket. The purpose of these 
discussions was to create awareness and educate stakeholders and 
regulated entities on the provisions for risk management required under 
TSCA section 6(a); explain the risk evaluation findings; obtain input 
from manufacturers, processors, distributors, users, academics, 
advisory councils, and members of the public health community about 
uses of TCE; identify workplace practices, engineering controls, 
administrative controls, PPE, and industrial hygiene plans currently in 
use or feasibly adoptable to reduce exposure to TCE under the 
conditions of use; understand the importance of TCE in the various uses 
subject to this proposed rule; compile knowledge about critical uses, 
substitute chemicals or alternative methods; identify various standards 
and performance specifications; and generate potential risk reduction 
strategies. EPA has met with, or otherwise communicated with, a variety 
of companies, trade associations and non-governmental public interest 
organizations to discuss the topics outlined in this paragraph; a list 
of external meetings held during the development of this proposed rule 
is in the docket (Ref. 35).
3. Children's Environmental Health
    The EPA 2021 Policy on Children's Health (Ref. 36) requires EPA to 
protect children from environmental exposures by consistently and 
explicitly considering early life exposures (from conception, infancy, 
early childhood and through adolescence until 21 years of age) and 
lifelong health in all human health decisions through identifying and 
integrating children's health data and information when conducting risk 
assessments. TSCA section 6(b)(4)(A) also requires EPA to conduct risk 
evaluations ``to determine whether a chemical substance presents an 
unreasonable risk of injury to health or the environment . . . 
including an unreasonable risk to a potentially exposed or susceptible 
subpopulation identified as relevant to the risk evaluation by the 
Administrator, under the conditions of use.'' Infants, children, and 
pregnant women are listed as examples of subpopulations based on 
lifestage that may be considered relevant ``potentially exposed or 
susceptible subpopulations'' in the TSCA section 3(12) definition of 
that term. In addition, TSCA section 6(a) requires EPA to apply one or 
more risk management requirements under TSCA section 6(a) so that TCE 
no longer presents an unreasonable risk (including unreasonable risk to 
PESS). Furthermore, TSCA 6(c)(2)(B) requires EPA to ``factor in, to the 
extent practicable,'' the considerations under TSCA section 6(c)(2)(A) 
when selecting among prohibitions and other restrictions in TSCA 
section 6(a) rules, including taking into consideration the magnitude 
of exposure to human health, as further discussed in Unit IV.
    The 2020 Risk Evaluation for TCE evaluated the hazards of TCE to 
all lifestages. Evidence of developmental hazards were observed for 
increased resorptions, fetal cardiac defects and decreased rearing 
activity (i.e., neurotoxicity). These effects occur in the offspring 
exposed either in utero or postnatally, with older pregnant women 
identified as especially susceptible to cardiac defects in their 
developing fetus based on epidemiological data. Adverse health effects 
to reproduction following TCE exposure include decreased normal sperm 
morphology and hyperzoospermia along with delayed onset of birth. The 
most sensitive non-cancer hazard identified for non-reproductive or 
developmental effects is autoimmunity following chronic exposure to 
TCE.
    The 2020 Risk Evaluation for TCE considered impacts on both 
children and adults from occupational and consumer use from inhalation 
and dermal exposures, as applicable. The 2020 Risk Evaluation for TCE 
identified consumers and bystanders associated with use of TCE-
containing consumer products as potentially exposed and susceptible 
subpopulations due to greater exposure. Consumer users are considered 
to include adults as well as children as young as 11. Bystanders in the 
home exposed via inhalation are considered to include any age group 
from infant (including breast-fed infants) to adult (including 
elderly), including pregnant women and individuals of reproductive age. 
Younger lifestages are likely exposed to higher internal dose 
concentrations of TCE than adults due to relative physiological 
differences in body weight, breathing rate, and other parameters. A 
further discussion on the magnitude of health effects and EPA's 
consideration of these health effects in this proposed rule is in Unit 
IV.

[[Page 74726]]

B. Regulatory Assessment of TCE

1. Description of Conditions of Use
    This unit describes the TSCA conditions of use whose risk EPA 
evaluated and considered in making its unreasonable risk determination 
for the chemical substance TCE. Condition of use descriptions were 
obtained from EPA sources such as CDR use codes, the 2020 Risk 
Evaluation for TCE and related documents, as well as the Organisation 
for Economic Co-operation and Development harmonized use codes and 
stakeholder engagements. For additional description of the conditions 
of use, including process descriptions and worker activities considered 
in the risk evaluation, see the Problem Formulation of the 2020 Risk 
Evaluation for TCE, the 2020 Risk Evaluation for TCE, and supplemental 
files (Refs. 37, 1, 38). EPA acknowledges that some of the terms used 
in this unit may also be defined under other statutes; however, the 
descriptions here are intended to provide clarity to the regulated 
entities who would be subject to the provisions of this proposed rule 
under TSCA section 6(a).
a. Manufacturing
i. Domestic Manufacture
    This condition of use refers to the making or producing of a 
chemical substance within the United States (including manufacturing 
for export), or the extraction of a component chemical substance from a 
previously existing chemical substance or a complex combination of 
substances. This description does not apply to TCE production as a 
byproduct, including during the manufacture of 1,2-dichloroethane, 
which EPA intends to consider in the risk evaluation for 1,2-
dichloroethane (Ref. 39).
ii. Import
    This condition of use refers to the act of causing a chemical 
substance or mixture to arrive within the customs territory of the 
United States.
b. Processing
i. Processing as a Reactant/Intermediate
    This condition of use refers to processing TCE in chemical 
reactions for the manufacturing of another chemical substance or 
product, notably including but not limited to 1,1,1,2-
tetrafluoroethane, an HFC also known as HFC-134a, which is used as a 
refrigerant and in fluorocarbon blends for refrigerants. This condition 
of use includes reuse of byproduct or residual TCE as a reactant.
ii. Processing: Incorporation Into a Formulation, Mixture, or Reaction 
Product
    This condition of use refers to when TCE is added to a product (or 
product mixture) prior to further distribution of the product; such 
products include but are not limited to solvents (for cleaning or 
degreasing), adhesives and sealant chemicals, and solvents that become 
part of a product formulation or mixture (e.g., lubricants and greases, 
paints and coatings, other uses).
iii. Processing: Incorporation Into Articles
    This condition of use refers to when a chemical substance becomes 
an integral component of an article distributed for industrial, 
commercial, or consumer use.
iv. Processing: Repackaging
    This condition of use refers to the preparation of a chemical 
substance for distribution in commerce in a different form, state, or 
quantity. This includes but is not limited to transferring the chemical 
from a bulk container into smaller containers.
v. Processing: Recycling
    This condition of use refers to the process of managing used 
solvents that are collected, either on-site or transported to a third-
party site, for commercial purpose other than disposal. Spent solvents 
can be restored via solvent reclamation/recycling. The recovery process 
may involve an initial vapor recovery or mechanical separation step 
followed by distillation, purification, and final packaging.
c. Industrial and Commercial Use
i. Industrial and Commercial Use as Solvent for Open-Top Batch Vapor 
Degreasing
    This condition of use refers to the process of heating TCE to its 
volatilization point and using its vapor to remove dirt, oils, greases, 
and other surface contaminants (such as drawing compounds, cutting 
fluids, coolants, solder flux, and lubricants) from metal parts, 
electronics, or other articles in batch open-top vapor degreasers 
(OTVDs).
ii. Industrial and Commercial Use as Solvent for Closed-Loop Batch 
Vapor Degreasing
    This condition of use refers to the process of heating TCE to its 
volatilization point and using its vapor to remove dirt, oils, greases, 
and other surface contaminants (such as drawing compounds, cutting 
fluids, coolants, solder flux, and lubricants) from metal parts, 
electronics, or other articles in batch closed-loop vapor degreasers.
iii. Industrial and Commercial Use as Solvent for In-Line Conveyorized 
Vapor Degreasing
    This condition of use refers to the process of heating TCE to its 
volatilization point and using its vapors to remove dirt, oils, 
greases, and other surface contaminants from textiles, glassware, metal 
surfaces, and other articles using in-line conveyorized degreasing 
machines.
iv. Industrial and Commercial Use as Solvent for In-Line Web Cleaner 
Vapor Degreasing
    This condition of use refers to the process of heating TCE to its 
volatilization point and using its vapors to remove dirt, oils, 
greases, and other surface contaminants from textiles, glassware, metal 
surfaces, and other articles using in-line web cleaning degreasing 
machines.
v. Industrial and Commercial Use as Solvent for Cold Cleaning
    This condition of use refers to the industrial and commercial use 
of TCE as a non-boiling solvent in cold cleaning to dissolve oils, 
greases and other surface contaminants from textiles, glassware, metal 
surfaces, and other articles.
vi. Industrial and Commercial Use as a Solvent for Aerosol Spray 
Degreaser/Cleaner and Mold Release
    This condition of use refers to industrial and commercial use of 
TCE in aerosol degreasing as an aerosolized solvent spray, typically 
applied from a pressurized can, to remove residual contaminants from 
fabricated parts or machinery (including circuit boards and 
electronics). This description also applies to the use of TCE in 
products to remove dirt, grease, stains, spots, and foreign matter, 
including but not limited to release agent residues, from molds and 
casting surfaces.
vii. Industrial and Commercial Use as a Lubricant and Grease in Tap and 
Die Fluid
    This condition of use refers to industrial and commercial use of 
TCE in products such as, but not limited to, metalworking, cutting, and 
tapping fluid to reduce friction, heat generation and wear, to assist 
in metal shaping, and to protect the part being shaped from oxidation. 
This description does not apply to use of TCE in products intended as 
penetrating lubricant, which are described in a different condition of 
use.

[[Page 74727]]

viii. Industrial and Commercial Use as a Lubricant and Grease in 
Penetrating Lubricant
    This condition of use refers to the industrial and commercial use 
of TCE in products as a lubricant and grease in penetrating lubricant, 
to reduce friction, heat generation and wear between surfaces. This 
description does not apply to use of TCE in products intended as 
metalworking, cutting and tapping fluids, which are described in a 
different condition of use.
ix. Industrial and Commercial Use as an Adhesive and Sealant in 
Solvent-Based Adhesives and Sealants; Tire Repair Cement/Sealer; Mirror 
Edge Sealant
    This condition of use refers to industrial and commercial use of 
TCE in adhesive and sealant products to promote bonding between other 
substances, promote adhesion of surfaces, or prevent seepage of 
moisture or air.
x. Industrial and Commercial Use as a Functional Fluid in Heat Exchange 
Fluid
    This condition of use refers to the industrial and commercial use 
of TCE as a functional fluid in heat exchange fluid used to transmit or 
to remove heat from another material in a closed system.
xi. Industrial and Commercial Use in Paints and Coatings as a Diluent 
in Solvent-Based Paints and Coating
    This condition of use refers to industrial and commercial use of 
TCE in paints and coatings that are applied to surfaces to enhance 
properties such as, but not limited to, water repellency, gloss, fade 
resistance, ease of application, or foam prevention.
xii. Industrial and Commercial Use in Cleaning and Furniture Care 
Products in Carpet Cleaner and Wipe Cleaning
    This condition of use refers to the industrial and commercial use 
of TCE in products to remove dirt, grease, stains, spots, and foreign 
matter from furniture and furnishings, including but not limited to 
carpets and rugs. This description also applies to use of TCE in 
degreasing and cleaning products to remove dirt, grease, stains, spots, 
and foreign matter from furniture and furnishings or to cleanse, 
sanitize, bleach, scour, polish, protect, or improve the appearance of 
surfaces through wipe cleaning. This description does not apply to the 
use of TCE as a spot remover for laundry and dishwashing, which is 
described in a different condition of use.
xiii. Industrial and Commercial Use in Laundry and Dishwashing Products 
in Spot Remover
    This condition of use refers to industrial and commercial use of 
TCE as a solvent in products for cleaning in laundry and dishwashing 
applications to remove dirt, grease, stains, spots, and foreign matter 
from garments and dishware.
xiv. Industrial and Commercial Use in Arts, Crafts, and Hobby Materials 
in Fixatives and Finishing Spray Coatings
    This condition of use refers to the industrial and commercial use 
of TCE in aerosol products, such as, but not limited to, fixatives, 
shellacs, or other spray applied coatings intended to cover or hold 
other arts and crafts materials to a surface.
xv. Industrial and Commercial Use in Corrosion Inhibitors and Anti-
Scaling Agents
    This condition of use refers to the industrial and commercial use 
of TCE in corrosion inhibitors and anti-scaling agents as a chemical 
substance used to prevent or retard corrosion or the formation of 
scale. As a corrosion inhibitor, TCE is used to prevent or retard 
corrosion on metallic materials. As an anti-scaling agent, TCE is added 
to products to prevent the build-up of inorganic oxide deposits.
xvi. Industrial and Commercial Use in Processing Aids in Process 
Solvent Used in Battery Manufacture; Process Solvent Used in Polymer 
Fabric Spinning, Fluoroelastomer Manufacture and Alcantara Manufacture; 
Extraction Solvent Used in Caprolactam Manufacture; Precipitant Used in 
Beta-Cyclodextrin Manufacture
    This condition of use refers to industrial and commercial use of 
TCE as a processing aid. A process solvent is a chemical substance used 
to improve the processing characteristics or the operation of process 
equipment when added to a process or to a substance or mixture to be 
processed. The chemical substance is not intended to become a part of 
the reaction product nor has function in the reaction product.
xvii. Industrial and Commercial Use as Ink, Toner, and Colorant 
Products in Toner Aid
    This condition of use refers to the industrial and commercial use 
of TCE in ink, toner, and colorant products in toner aid as chemical 
substance used for writing, printing, creating an image on paper and 
other substrates, or applied to substrates to change their color or 
hide images. This includes but is not limited to pigmented liquids, 
toners or powders contained in cartridges, bottles, or other dispensers 
used in printers and copy machines. This category includes printing 
inks for commercial applications.
xviii. Industrial and Commercial Use in Automotive Care Products in 
Brake and Parts Cleaner
    This condition of use refers to the industrial and commercial use 
of TCE in products to remove dirt, grease, stains, and foreign matter 
from interior and exterior vehicle surfaces. This description includes 
but is not limited to use of products for motorized vehicle maintenance 
and their parts.
xix. Industrial and Commercial Use in Apparel and Footwear Care 
Products in Shoe Polish
    This condition of use refers to the industrial or commercial use of 
TCE in apparel and footwear care products as post-market waxes, 
polishes, or other mediums and applied to footwear, textiles, or 
fabrics to impart color or other desirable properties.
xx. Industrial and Commercial Use in Hoof Polish, Gun Scrubber, Pepper 
Spray, Other Miscellaneous Industrial and Commercial Uses
    This condition of use refers to the industrial and commercial use 
of TCE in which it is expected to act similar to a cleaning solvent 
used to remove dirt or other contaminants from substrates. This 
description also refers to other miscellaneous products which contain 
TCE as an additive to impart or enhance desirable properties of another 
material (e.g., adhesive, sealant, propellant). Additionally, this 
condition of use refers to the industrial and commercial use of TCE, 
often in small quantities, in a laboratory for chemical analysis (e.g., 
to test hot mix asphalt binder content, as a reference standard, etc.), 
chemical synthesis, extracting and purifying other chemicals, 
dissolving other substances, and similar activities.
d. Consumer Use
i. Consumer Use as a Solvent in Brake and Parts Cleaner
    This condition of use refers to the consumer use of TCE in products 
to remove dirt, grease, stains, and foreign matter from interior and 
exterior vehicle surfaces, particularly in brake cleaner and parts 
cleaner.
ii. Consumer Use as a Solvent in Aerosol Electronic Degreaser/Cleaner
    This condition of use refers to the consumer use of TCE as a 
solvent in degreasing and cleaning products used

[[Page 74728]]

to remove dirt, grease, stains, spots, and foreign matter through a 
process that uses an aerosolized solvent spray, typically applied from 
a pressurized can, to remove residual contaminants from electronics.
iii. Consumer Use as a Solvent in Liquid Electronic Degreaser/Cleaner
    This condition of use refers to the consumer use of TCE as a 
solvent in degreasing and cleaning products used to remove dirt, 
grease, stains, spots, and foreign matter through a process that uses a 
liquid solvent to remove residual contaminants from electronics.
iv. Consumer Use as a Solvent in Aerosol Spray Degreaser/Cleaner
    This condition of use refers to the consumer use of TCE as a 
solvent in degreasing and cleaning products used to remove dirt, 
grease, stains, spots, and foreign matter through a process that uses 
an aerosolized solvent spray, typically applied from a pressurized can, 
to remove residual contaminants from metals and other fabricated 
materials not described elsewhere in this unit.
v. Consumer Use as a Solvent in Liquid Degreaser/Cleaner
    This condition of use refers to the consumer use of TCE as a 
solvent in liquid degreasing and cleaning products used to remove dirt, 
grease, stains, spots, and foreign matter from metals and other 
fabricated materials not described elsewhere.
vi. Consumer Use as a Solvent in Aerosol Gun Scrubber
    This condition of use refers to the consumer use of TCE as a 
solvent in aerosol products in which it is expected to act similar to a 
cleaning solvent used to remove residue, dirt, grease, or other 
contaminants, in particular but not limited to gun scrubber.
vii. Consumer Use as a Solvent in Liquid Gun Scrubber
    This condition of use refers to the consumer use of TCE as a 
solvent in liquid products in which it is expected to act similar to a 
cleaning solvent used to remove residue, dirt, grease, or other 
contaminant, in particular but not limited to gun scrubber.
viii. Consumer Use as a Solvent in Mold Release
    This condition of use refers to the consumer use of TCE in mold 
release products to create barriers to prevent certain materials from 
adhering to each other, and assist in the removal of dirt, grease, 
oils, and other contaminants from metal molds.
ix. Consumer Use as a Solvent in Aerosol Tire Cleaner
    This condition of use refers to the consumer use of TCE as an 
additive in aerosol products to impart or enhance desirable properties 
of another material, particularly in use as tire cleaner.
x. Consumer Use as a Solvent in Liquid Tire Cleaner
    This condition of use refers to the consumer use of TCE as an 
additive in liquid products to impart or enhance desirable properties 
of another material, particularly in use as tire cleaner.
xi. Consumer Use as a Lubricant and Grease in Tap and Die Fluid
    This condition of use refers to the consumer use of TCE in products 
to reduce friction, heat generation and wear between solid surfaces, 
particularly in tap and die fluid.
xii. Consumer Use as a Lubricant and Grease in Penetrating Lubricant
    This condition of use refers to the consumer use of TCE in products 
to reduce friction, heat generation and wear between solid surfaces, 
particularly in penetrating lubricant.
xiii. Consumer Use as an Adhesive and Sealant in Solvent-Based Adhesive 
and Sealants
    This condition of use refers to the consumer use of TCE as a 
solvent in single or two component products used to fasten other 
materials together or prevent the passage of liquid or gas. This 
description does not apply to products for mirror edge sealant or tire 
repair, which are described in different conditions of use.
xiv. Consumer Use as an Adhesive and Sealant in Mirror Edge Sealant
    This condition of use refers to the consumer use of TCE in single 
or two component products used to fasten other materials together or 
prevent the passage of liquid or gas, particularly in mirror edge 
sealant.
xv. Consumer Use as an Adhesive and Sealant in Tire Repair Cement/
Sealer
    This condition of use refers to the consumer use of TCE in single 
or two component products used to fasten other materials together or 
prevent the passage of liquid or gas, particularly in cement or sealant 
for tire repair.
xvi. Consumer Use as a Cleaning and Furniture Care Product in Carpet 
Cleaner
    This condition of use refers to the consumer use of TCE as a 
solvent in cleaning and furniture care products used to remove dirt, 
grease, stains, spots, foreign matter, and residual contaminants, 
particularly in carpet cleaner.
xvii. Consumer Use as a Cleaning and Furniture Care Product in Aerosol 
Spot Remover
    This condition of use refers to the consumer use of TCE as a 
solvent in cleaning and furniture care products used to remove dirt, 
grease, stains, spots, and foreign matter through a process that uses 
an aerosolized solvent spray, typically applied from a pressurized can, 
to remove residual contaminants, particularly in aerosol spot remover.
xviii. Consumer Use as a Cleaning and Furniture Care Product in Liquid 
Spot Remover
    This condition of use refers to the consumer use of TCE as a 
solvent in cleaning and furniture care products in the form of a solid 
or liquid cleaner, used to remove dirt, grease, stains, spots, foreign 
matter, and residual contaminants, particularly in liquid spot remover.
xix. Consumer Use in Arts, Crafts, and Hobby Materials in Fixative and 
Finishing Spray Coatings
    This condition of use refers to the consumer use of TCE in arts, 
crafts, and hobby products that uses an aerosolized solvent spray, 
typically applied from a pressurized can, intended to cover or hold 
other arts and crafts materials to a surface, particularly in fixative 
and finishing spray coatings.
xx. Consumer Use in Apparel and Footwear Products in Shoe Polish
    This condition of use refers to the consumer use of TCE in apparel 
and footwear care products as post-market waxes, polishes, or other 
mediums and applied to footwear, textiles, or fabrics to impart color 
or other desirable properties.
xxi. Consumer Use in Fabric Spray
    This condition of use refers to the consumer use of TCE in aerosol 
products, typically applied from a pressurized can, as an additive to 
enhance desirable properties of another material, particularly in 
fabric spray and as an anti-fray spray.

[[Page 74729]]

xxii. Consumer Use in Film Cleaner
    This condition of use refers to the consumer use of TCE in products 
as an additive to impart or enhance the desirable properties of another 
material, particularly in film cleaner.
xxiii. Consumer Use in Hoof Polish
    This condition of use refers to the consumer use of TCE as an 
additive to impart or enhance desirable properties of another material, 
particularly in hoof polish.
xxiv. Consumer Use in Toner Aid
    This condition of use refers to the consumer use of TCE in products 
as an additive to impart or enhance the desirable properties of another 
material, particularly in toner aid.
e. Disposal
    This condition of use refers to the process of disposing of 
generated waste streams of TCE that are collected either on-site or 
transported to a third-party site. This includes the mixing of TCE with 
wastewater and the discharge of TCE-contaminated wastewater pursuant to 
a NPDES permit, and specifically includes discharge to industrial pre-
treatment, industrial treatment, or publicly owned treatment works. 
While EPA views the disposal condition of use under TSCA broadly (see, 
e.g., EPA's proposed regulation on certain conditions of use of 
chrysotile asbestos (Ref. 40), for the purpose of this rulemaking under 
TSCA section 6(a), based on the underlying analysis in the 2020 TCE 
risk evaluation, EPA's proposed regulations specifically address the 
risk to PESS from disposal of TCE to industrial pre-treatment, 
industrial treatment, or publicly owned treatment works. EPA recognizes 
that this includes activities that may not be considered disposal under 
other statutes, such as RCRA and the CWA.
f. Terminology in This Proposed Rule
    For purposes of this proposed rulemaking, ``occupational conditions 
of use'' refers to the TSCA conditions of use described in Units 
III.B.1.a., b., c., and e. Although EPA identified both industrial and 
commercial uses in the 2020 Risk Evaluation for TCE for purposes of 
distinguishing scenarios, the Agency clarified then and clarifies now 
that EPA interprets the authority over ``any manner or method of 
commercial use'' under TSCA section 6(a)(5) to reach both.
    Additionally, in the 2020 Risk Evaluation for TCE, EPA identified 
and assessed all known, intended, and reasonably foreseen industrial, 
commercial, and consumer uses of TCE in order to determine whether TCE 
as a whole chemical substance presents unreasonable risk to health and 
the environment. EPA determined that a substantial amount of the 
industrial, commercial, and consumer uses of TCE evaluated in the 2020 
Risk Evaluation for TCE present unreasonable risk of injury to health. 
As such, for purposes of this risk management rulemaking, ``consumer 
use'' refers to all consumer uses including known, intended, and 
reasonably foreseen consumer uses for TCE. Likewise, for the purpose of 
this risk management rulemaking ``industrial and commercial use'' 
refers to all industrial and commercial uses, including known, 
intended, or reasonably foreseen TCE industrial and commercial use.
    EPA is not proposing to incorporate the descriptions of known, 
intended, or reasonably foreseen conditions of use in Unit III.B.1.a. 
through e. into the regulatory text as definitions because these 
conditions of use represent those evaluated in the 2020 Risk Evaluation 
for TCE, whereas the regulatory text applies to all consumer and 
industrial/commercial uses. EPA requests comment on whether EPA should 
promulgate definitions for those conditions of use evaluated in the 
2020 Risk Evaluation for TCE, and, if so, whether the descriptions in 
this unit are consistent with the conditions of use evaluated in the 
2020 Risk Evaluation for TCE and whether they provide a sufficient 
level of detail to improve the clarity and readability of the 
regulation if EPA were to promulgate a regulation controlling 
industrial and commercial conditions of use that pertained only to the 
listed industrial and commercial conditions of use evaluated in the 
2020 Risk Evaluation for TCE.
    EPA further notes that this proposed rule does not apply to any 
substance excluded from the definition of ``chemical substance'' under 
TSCA section 3(2)(B)(ii) through (vi). Those exclusions include, but 
are not limited to, any pesticide (as defined by the Federal 
Insecticide, Fungicide, and Rodenticide Act) when manufactured, 
processed, or distributed in commerce for use as a pesticide; and any 
food, food additive, drug, cosmetic, or device, as defined in section 
201 of the Federal Food, Drug, and Cosmetic Act (FFDCA), when 
manufactured, processed, or distributed in commerce for use as a food, 
food additive, drug, cosmetic or device.
2. Description of Unreasonable Risk Under the Conditions of Use
    EPA has determined that TCE presents an unreasonable risk of injury 
to human health under the conditions of use based on acute and chronic 
non-cancer risks and chronic cancer risks (Ref. 2). As described in the 
TSCA section 6(b) 2020 Risk Evaluation for TCE, EPA identified non-
cancer adverse effects from acute and chronic inhalation and dermal 
exposures to TCE, and for cancer from chronic inhalation and dermal 
exposures to TCE (Ref. 1). In the TCE risk characterization, the 
endpoints identified by EPA as the basis for the unreasonable risk 
determination in the Risk Conclusions were immunosuppression effects 
for acute inhalation and dermal exposures, and autoimmunity effects for 
chronic inhalation and dermal exposures (Ref. 1). Additional risks 
associated with other non-cancer adverse effects (e.g., developmental 
toxicity, immunosuppression, liver toxicity, kidney toxicity, 
neurotoxicity, autoimmunity, and reproductive toxicity) were identified 
for acute and chronic inhalation and dermal exposures, as well as 
cancer (liver, kidney, and non-Hodgkin lymphoma) for chronic inhalation 
and dermal exposures. EPA also concluded, based on EPA's Guidelines for 
Carcinogen Risk Assessment (Ref. 41), that TCE is considered to be 
carcinogenic by all routes of exposure and calculated cancer risks from 
chronic inhalation and dermal exposures (Ref. 1). Unit IV. summarizes 
the health effects and the magnitude of the exposures.
    To make the unreasonable risk determination for TCE, EPA evaluated 
exposures to potentially exposed or susceptible subpopulations 
including workers, ONUs, consumer users, and bystanders to consumer use 
by using reasonably available monitoring and modeling data for 
inhalation and dermal exposures. (Ref. 1). EPA conducted a screening-
level analysis to assess potential risks from the air and water 
pathways to fenceline communities. A discussion of EPA's analysis and 
the expected effects of this rulemaking on fenceline communities is in 
Unit VII.A.
    For the 2020 Risk Evaluation for TCE, and as discussed in Unit 
II.D.1. and Unit III.A.3., EPA considered PESS. EPA identified the 
following groups as PESS: workers and ONUs, including men and women of 
reproductive age, adolescents, and biologically susceptible 
subpopulations; and consumer users (age 11 and older) and bystanders 
(of any age group, including infants, toddlers, children, and elderly), 
including biologically susceptible subpopulations. Additionally, older 
pregnant women are identified as especially susceptible to cardiac 
defects in their developing fetus based on

[[Page 74730]]

epidemiological data (Ref. 1). All PESS are included in the 
quantitative and qualitative analyses described in the 2020 Risk 
Evaluation for TCE and were considered in the determination of 
unreasonable risk for TCE (Ref. 1, 2). As discussed in Unit II.D. and 
Unit IV.B., the 2020 Risk Evaluation for TCE excluded the air and water 
exposure pathways to the general population from the published risk 
evaluations and may have caused some risks to be unaccounted for in the 
risk evaluation. EPA considers these groups a subset of the general 
population and categorizes them as fenceline communities; they may also 
be considered PESS. See Unit VII.A. for further discussion on assessing 
and protecting against risk to fenceline communities.
3. Description of TSCA Section 6 Requirements for Risk Management
    EPA examined the TSCA section 6(a) requirements (listed in Unit 
III.A.) to identify which ones have the potential to address the 
unreasonable risk for TCE.
    As required, EPA developed a proposed regulatory action and one or 
more primary alternative regulatory actions, which are described in 
Units V.A. and V.B., respectively. To identify and select a regulatory 
action, EPA considered the two routes of exposure driving the 
unreasonable risk, inhalation and dermal, and the exposed populations. 
For occupational conditions of use (see Unit III.B.1.f.), EPA 
considered how it could directly regulate manufacturing (including 
import), processing, distribution in commerce, industrial and 
commercial use, or disposal to address the unreasonable risk. EPA does 
not have direct authority to regulate consumer use. Therefore, EPA 
considered how it could exercise its authority under TSCA to regulate 
the manufacturing (including import), processing, and/or distribution 
in commerce of TCE at different points in the supply chain to eliminate 
exposures or restrict the availability of TCE and TCE-containing 
products for consumer use in order to address the unreasonable risk.
    As required by TSCA section 6(c)(2), EPA considered several 
factors, in addition to identified unreasonable risk, when selecting 
among possible TSCA section 6(a) requirements. To the extent 
practicable, EPA factored into its decisions the effects of TCE on 
health, which is described in Unit IV. EPA also factored into its 
decisions, to the extent practicable: the effects of TCE on the 
environment and the magnitude of exposure to TCE of human beings and 
the environment, the benefits of TCE for various uses, and the 
reasonably ascertainable economic consequences of the rule. In 
evaluating the reasonably ascertainable economic consequences of the 
rule, EPA considered: (i) The likely effect of the rule on the national 
economy, small business, technological innovation, the environment, and 
public health; (ii) The costs and benefits of the proposed regulatory 
action and one or more primary alternative regulatory actions 
considered; and (iii) The cost effectiveness of the proposed regulatory 
action and of the one or more primary alternative regulatory actions 
considered. See Unit VII. for further discussion related to TSCA 
section 6(c)(2)(A) considerations, including the statement of effects 
of the proposed rule with respect to these considerations.
    EPA also considered the regulatory authority under TSCA and other, 
statutes such as the OSH Act, Consumer Product Safety Act (CPSA), and 
other EPA-administered statutes, to examine: (1) Whether there are 
opportunities for all or part of risk management action on TCE to be 
addressed under other statutes, such that a referral may be warranted 
under TSCA sections 9(a) or section 9(b); or (2) Whether TSCA section 
6(a) regulation could include alignment of requirements and definitions 
in and under existing statutes to minimize confusion to the regulated 
entities and the general public.
    In addition, EPA followed other TSCA requirements such as 
considering the availability of alternatives when contemplating 
prohibition or a substantial restriction (TSCA section 6(c)(2)(C), as 
outlined in Unit VI.B.), and setting proposed compliance dates in 
accordance with the requirements in TSCA section 6(d)(1) (described in 
the proposed and alternative regulatory action in Unit V.).
    To the extent information was reasonably available, when selecting 
regulatory actions, EPA considered pollution prevention and the 
hierarchy of controls adopted by OSHA and NIOSH, with the goal of 
identifying risk management control methods that are permanent, 
feasible, and effective. EPA also considered how to address the 
unreasonable risk while providing flexibility to the regulated entities 
where appropriate. EPA considered the information presented in the 2020 
Risk Evaluation for TCE, as well as additional input from stakeholders 
(as described in Unit III.A.), and anticipated compliance strategies 
from regulated entities.
    Taken together, these considerations led EPA to the proposed 
regulatory action and primary alternative regulatory actions described 
in Unit V. Additional details related to how the requirements in this 
unit were incorporated into development of those actions are in Unit 
VI.

IV. Considerations of Health Effects of TCE

    TSCA section 6(a) rules must be promulgated ``in accordance with 
subsection (c)(2).'' TSCA section 6(c)(2)(A) requires EPA, in proposing 
and promulgating TSCA section 6(a) rules, to ``consider and publish a 
statement based on reasonably available information'' with respect to 
listed criteria, including the effects and magnitude of exposure to 
human health and the environment, the benefits of the chemical 
substance for various uses, and the reasonably ascertainable economic 
consequences of the rule. Under TSCA section 6(c)(2)(B), EPA must 
``factor in, to the extent practicable,'' the considerations under TSCA 
section 6(c)(2)(A) when selecting among prohibitions and other 
restrictions in TSCA section 6(a) rules. This section discusses the 
health effects of TCE. Other TSCA section 6(c)(2) considerations are 
discussed further in Unit VII.
    EPA's analysis of the health effects of TCE is in the 2020 Risk 
Evaluation (Ref. 1). This unit presents a summary of that information 
and an explanation of how EPA considered that information in developing 
the proposed and alternative regulatory options.
    TCE has a large database of human health toxicity data. The 2020 
Risk Evaluation for TCE identified several endpoints, such as kidney 
toxicity, immunotoxicity, or developmental toxicity, and often a single 
endpoint was examined by multiple studies. For acute exposures, EPA 
identified non-cancer effects (developmental toxicity and 
immunosuppression). For chronic exposures, EPA identified non-cancer 
effects (liver toxicity, kidney toxicity, neurotoxicity, autoimmunity, 
reproductive toxicity, and developmental toxicity) as well as cancer 
(liver, kidney, and non-Hodgkin lymphoma), with kidney cancer 
identified as acting through a mutagenic mode of action (Ref. 1). As 
discussed in this unit, the 2020 Risk Evaluation for TCE contains 
quantitative risk estimates using several points of departure (PODs), 
including both the immunotoxicity endpoints as well as the more 
sensitive developmental toxicity endpoints, specifically fetal cardiac 
defects, and both demonstrate that TCE presents risk.
    Additionally, in developing the 2020 Risk Evaluation for TCE, EPA 
analyzed

[[Page 74731]]

the reasonably available information to ascertain whether some human 
subpopulations may have greater exposure or greater susceptibility than 
the general population to the hazard posed by the chemical substance. 
Factors affecting susceptibility examined in the reasonably available 
studies on TCE include lifestage, sex, genetic polymorphisms, race/
ethnicity, preexisting health status, lifestyle factors, and nutrition 
status. Groups of individuals for which one or several of these factors 
apply may be considered PESS (Ref. 1).

A. ECEL Value of 0.0011 ppm Based on Developmental Toxicity (Proposed)

    Because TSCA section 6(c)(2)(B) directs EPA to factor in, to the 
extent practicable, the health effects of TCE under TSCA section 
6(c)(2)(A), TSCA section 6(c) thereby provides EPA with the flexibility 
to tailor the regulatory restrictions to account for particular health 
effects identified in the underlying risk evaluation. With this 
consideration, EPA found that, in some cases, a regulatory option that 
could reduce exposures such that they would achieve the benchmark 
margin of exposure for the most sensitive non-cancer endpoint 
(developmental toxicity) would address any risk for other non-cancer 
endpoints. Older pregnant workers and ONUs, who may be especially 
susceptible to TCE- induced cardiac defects in their developing fetus, 
are classified as a PESS, and the associated POD and risk estimates 
were included in the 2020 Risk Evaluation in consideration of PESS 
groups. EPA has carefully considered the health effects of TCE on 
pregnant workers and ONUs as part of the Agency's development of 
proposed requirements that would be applicable to certain occupational 
conditions of use of TCE. In order for this rulemaking to appropriately 
address risk to all workers and ONUs exposed to TCE through the 
occupational conditions of use for which EPA is proposing an ECEL 
associated with a WCPP, EPA has factored in consideration of additional 
health effects applicable to PESS, including older pregnant workers and 
ONUs (the group identified as most susceptible to fetal cardiac 
defects) pursuant to TSCA section 6(c)(2), and is proposing an ECEL 
value of 0.0011 ppm based on developmental toxicity (Ref. 13).
    In the risk characterization section of the 2020 Risk Evaluation 
for TCE, EPA acknowledged that fetal cardiac defects are an acute, non-
cancer endpoint of concern for older pregnant women, while also 
acknowledging uncertainty surrounding the use of this endpoint to 
inform the determination of whether TCE presents unreasonable risk of 
injury to health for all affected human populations. In the 2020 Risk 
Evaluation for TCE, EPA presented the Agency's findings with respect to 
different endpoints and characterized the immunotoxicity endpoints as 
the ``best overall'' non-cancer endpoints for use in the risk 
conclusions and risk determination. The endpoints were characterized in 
this way precisely because of the quantitative uncertainties 
surrounding the use of the fetal cardiac defects endpoint and other 
considerations. Further, as noted in Unit II.D.1., EPA has received 
numerous comments on EPA's 2020 TSCA Risk Evaluation policy choice 
regarding endpoint selection that have raised concerns pertaining to 
political interference and scientific integrity, among other issues. 
Among the non-cancer adverse health effects, the drivers for EPA's 
whole chemical unreasonable risk determination for TCE under TSCA were 
identified as immunotoxicity, acute immunosuppression, and chronic 
autoimmunity from inhalation and dermal exposures (Ref. 2). EPA 
received significant feedback on this aspect of the 2020 Risk 
Evaluation for TCE, including focused attention on this issue from the 
SACC and public commenters reacting to the draft Risk Evaluation for 
TCE (Ref. 42). Moreover, based on the discussion included in the peer 
review report of the 2020 Risk Evaluation, EPA also concluded that 
reasonable scientists would not disallow the use of the fetal cardiac 
defects studies, and that therefore other EPA program reliance on the 
fetal cardiac defects endpoint is scientifically valid (e.g., IRIS).
    The 2020 Risk Evaluation for TCE identified the developmental 
toxicity endpoint of fetal cardiac defects, which presents a lower POD 
than the immunotoxicity endpoints. The magnitude of the unreasonable 
risk from exposures to TCE would have been greater had the Agency 
relied upon the developmental toxicity endpoint (Ref. 1). Specifically, 
EPA identified the risk of fetal cardiac defects most strongly 
associated with offspring of older mothers, and therefore included risk 
estimates for fetal cardiac defects that account for susceptible 
mothers and their offspring in addition to PESS groups with other 
susceptibilities (e.g., diabetes, infection status, drug exposure, 
stress, and metabolic sensitivity due to increased enzymatic activity 
of cytochrome P450 2E1 (CYP2E1) (Ref. 1).
    EPA developed the ECEL for the most sensitive health endpoint 
(developmental toxicity) in support of risk management efforts on TCE 
under TSCA, to identify that ambient exposures that are kept at or 
below the 8-hour ECEL of 0.0011 ppm would protect against risk of 
injury to health due to fetal cardiac defects, if those levels can be 
achieved. In addition, EPA expects that at the acute non-cancer ECEL of 
0.0011 ppm, any potentially exposed person in the workplace would be 
protected against other non-cancer effects resulting from occupational 
exposures, as well as excess risk of cancer (Ref. 13). EPA expects that 
if a facility were able to meet the ECEL (0.0011 ppm) requirement 
associated with the WCPP under the proposed regulatory action outlined 
in Unit V.A.2., it would protect PESS during the phaseout period before 
the full prohibition.

B. ECEL Value of 0.0040 ppm Based on Immunotoxicity (Primary 
Alternative)

    In other risk management actions under TSCA section 6, EPA has 
proposed basing its worker protection requirements, such as an ECEL, on 
a single acute or chronic exposure endpoint that provided the basis for 
the unreasonable risk determination (Ref. 40). While EPA is proposing a 
different basis for the ECEL for the WCPP for TCE (0.0011 ppm) (to 
protect a sensitive PESS), EPA recognizes that among the non-cancer 
adverse health effects of TCE, the drivers for EPA's whole chemical 
unreasonable risk determination for TCE under TSCA were identified as 
immunotoxicity, namely acute immunosuppression and chronic autoimmunity 
from inhalation and dermal exposures (Ref. 2). For this reason, the 
primary alternative regulatory action provided by EPA includes a WCPP 
with a different ECEL (0.0040 ppm), based on the endpoint that drives 
the unreasonable risk. As described in more detail in Unit V.B.2., 
reducing exposures to or below the ECEL of 0.0040 ppm would address 
that component of the unreasonable risk of injury to health from TCE 
that is driven by inhalation exposures in an occupational setting 
(Refs. 1, 14). If ambient exposures are kept at or below the 8-hour 
ECEL of 0.0040 ppm, EPA expects that workers and ONUs would be 
protected against not only the chronic non-cancer effects for 
autoimmunity described in this unit, but also effects resulting from 
acute non-cancer exposure (immunosuppression) and cancer.
    As described in Unit V.A.2., for the ECEL value of 0.0011 ppm, 
proposed as

[[Page 74732]]

part of the WCPP, EPA requests comment on the use of TSCA section 
6(c)(2) to tailor the risk management actions where necessary to 
protect PESS. Also, as described in Unit V.B.2., EPA is requesting 
comment on the use of the ECEL value of 0.0040 ppm in the WCPP in the 
alternative regulatory action. Specifically, EPA is requesting comment 
on the selection of the fetal cardiac defects endpoint for the ECEL of 
0.0011 ppm in the proposed regulatory action, rather than the 
immunotoxicity endpoint on which the unreasonable risk determination is 
based, which would result in an ECEL of 0.0040 ppm. EPA is also 
requesting comment on additional ways to protect workers and ONUs who 
are or may become pregnant.

V. Proposed and Primary Alternative Regulatory Actions

    This unit describes the proposed regulatory action by EPA so that 
TCE will no longer present an unreasonable risk of injury to health. In 
addition, as indicated by TSCA section 6(c)(2)(A), EPA must consider 
the costs and benefits and the cost effectiveness of the proposed 
regulatory action and one or more primary alternative regulatory 
actions. In the case of TCE, the proposed regulatory action is 
described in Unit V.A. and the primary alternative regulatory action 
considered is described in Unit V.B. An overview of the proposed 
regulatory action and primary alternative regulatory action for each 
condition of use is in Unit V.C. The rationale for the proposed and 
primary alternative regulatory actions and associated compliance 
timeframes are discussed in this unit and in more detail in Unit VI.A.

A. Proposed Regulatory Action

    EPA is proposing under TSCA section 6(a) to: Prohibit all 
manufacture (including import), processing, distribution in commerce, 
and industrial and commercial use of TCE for all uses (including all 
consumer uses), with longer timeframes and workplace controls for 
certain processing and industrial and commercial uses (including 
proposed phaseouts and TSCA section 6(g) exemptions); prohibit the 
disposal of TCE to industrial pre-treatment, industrial treatment, or 
publicly owned treatment works with a 50-year TSCA section 6(g) 
exemption for cleanup projects; and establish recordkeeping and 
downstream notifications requirements. Prohibitions on manufacturing 
(including import) and processing, including staggered implementation 
timeframes to account for the supply chain, are outlined in Unit 
V.A.1.a.; prohibitions on industrial and commercial uses and 
distribution in commerce are outlined in Unit V.A.1.b.; and 
prohibitions related to consumer uses are outlined in Unit V.A.1.c.
    EPA is proposing longer compliance timeframes (with workplace 
controls) for prohibitions on certain conditions of use. The timeframe 
for a prohibition or phaseout under TSCA section 6(d) must begin as 
soon as practicable, but not later than 5 years, with the full 
implementation of the prohibition or phase-out requirements occurring 
as soon as practicable and providing for a reasonable transition 
period. For a TSCA section 6(g) exemption for a specific condition of 
use, EPA must establish a time limit as reasonable on a case-by-case 
basis as long as the exemption meets the criteria under TSCA section 
6(g)(1). First, EPA is proposing to prohibit the manufacturing 
(including import) and processing of TCE as an intermediate for the 
manufacture of HFC-134a through an 8.5-year phaseout, as outlined in 
Unit V.A.1.d. Second, EPA is proposing a 10-year phaseout for the 
industrial and commercial use of TCE as a solvent for closed-loop batch 
vapor degreasing for rayon fabric scouring for end use in rocket 
booster nozzle production for Federal agencies and their contractors, 
conditioned on a final pre-launch test within 5 years of rocket booster 
nozzles that have been produced without using TCE, as outlined in Unit 
V.A.1.e. Third, EPA is proposing a time-limited exemption for 10 years 
under a TSCA section 6(g) exemption related to prohibitions on the 
industrial and commercial use of TCE as a processing aid for battery 
separator manufacturing, as outlined in Unit V.A.3.b.i. Fourth, EPA is 
proposing a time-limited exemption for 10 years under a TSCA section 
6(g) exemption related to prohibitions on industrial uses of TCE for 
DoD vessel requirements for potting, bonding and sealing compounds, and 
bonding and cleaning requirements for naval combat systems, radars, 
sensors, equipment, and fabrication and prototyping processes, as 
outlined in Unit V.A.3.b.ii. Fifth, EPA is proposing a time-limited 
exemption for 50 years under a TSCA section 6(g) exemption related to 
prohibitions on the industrial and commercial use of TCE in laboratory 
use for essential laboratory activities and some research and 
development activities, as outlined in Unit V.A.3.b.iii. Sixth, EPA is 
proposing a time-limited exemption for 7 years under a TSCA section 
6(g) exemption related to prohibitions on the industrial and commercial 
use of TCE as a solvent in closed loop vapor degreasing necessary for 
human-rated rocket engine cleaning by NASA and its contractors. 
Seventh, EPA is proposing a time-limited exemption for 10 years under a 
TSCA section 6(g) exemption for emergency industrial and commercial use 
of TCE for specific conditions of use which are critical or essential 
in furtherance of NASA's mission and for which no technically and 
economically safer alternative is available. Where conditions of use 
would be prohibited under timeframes longer than one year, EPA's 
proposal aims to align with elements of existing OSHA regulations and 
industrial hygiene best practices to the extent possible by 
implementing a Workplace Chemical Protection Program (WCPP). The WCPP 
includes requirements for an inhalation exposure limit and glove 
requirements to limit exposure to TCE until the prohibitions take 
effect, as outlined in Unit V.A.2. Lastly, EPA is proposing to prohibit 
certain disposal of TCE (specifically, the disposal of TCE to 
industrial pre-treatment, industrial treatment, or publicly owned 
treatment works), as outlined in Unit V.A.1.f., with a time limited 50-
year exemption for cleanup projects as outlined in Unit V.A.3.b.iv; and 
establish recordkeeping and downstream notification requirements, as 
outlined in Unit V.A.4. EPA requests comment on the applicability to 
the private sector of proposed regulatory actions pertaining 
specifically to Federal agencies, namely industrial uses for DoD vessel 
requirements and closed-loop batch vapor degreasing for rayon fabric 
scouring for rocket booster nozzle production. EPA requests comment on 
the extent to which the private sector would be affected by a 
prohibition on these uses.
1. Prohibitions of Manufacturing, Processing, Distribution in Commerce, 
Use, and Disposal
a. Prohibitions on Manufacturing (Including Import) and Processing of 
TCE
    EPA is proposing to prohibit the manufacturing (including import) 
and processing of TCE based on the unreasonable risk to workers and 
ONUs driven by these conditions of use (Ref. 2). As the manufacture and 
processing of TCE presents and unreasonable risk to health in the 
United States, the manufacture and processing of TCE for export would 
also be prohibited in accordance with TSCA section 12(a)(2).
    As discussed in Units III.B.3. and VI.A., based on the Agency's 
consideration of alternatives under TSCA section 6(c)(2)(C), 
uncertainty

[[Page 74733]]

relative to the feasibility of exposure reduction to sufficiently 
address the unreasonable risk across the broad range of occupational 
environments and activities that occur in manufacturing (including 
import) and processing conditions of use, and the irreversible health 
effects associated with TCE exposures, EPA has determined that 
prohibition is the best way to address the unreasonable risk.
    EPA is proposing that the prohibitions on manufacturing (including 
import) and processing of TCE would follow a staggered schedule, due to 
supply chain considerations. EPA proposes that the compliance dates for 
the proposed prohibitions described in this unit, such that the 
requirements would come into effect in 90 days (3 months) for 
manufacturers and in 180 days (6 months) for processors, with different 
timeframes related to specific conditions of use. Specifically, for 
processing TCE as a reactant/intermediate, EPA is proposing that the 
compliance dates for the proposed prohibitions described in this unit 
would come into effect in 1.5 years for manufacturers and 2 years for 
processors. There are additional exceptions from the prohibition for 
the manufacturing and processing associated with certain processing and 
industrial and commercial uses, including those described later in this 
unit (for which EPA is proposing longer compliance timeframes, 
including phaseouts (see Units V.A.1.b., d., and e.) or time-limited 
exemptions under TSCA section 6(g) (see Unit V.A.3.b.)). The rationale 
for longer timeframes for certain conditions of use is described in 
Unit VI.A.1.
b. Prohibitions on Industrial and Commercial Use and Distribution in 
Commerce of TCE
    EPA is proposing to prohibit the industrial and commercial use of 
TCE, based on the unreasonable risk to workers and ONUs driven by these 
conditions of use (Ref. 2). As discussed in Units III.B.3. and VI.A., 
based on consideration of alternatives under TSCA section 6(c)(2)(C), 
uncertainty relative to the feasibility of exposure reduction to 
sufficiently address the unreasonable risk across the broad range of 
work environments and activities represented by industrial and 
commercial uses of TCE, and the irreversible health effects associated 
with TCE exposures, EPA has determined that prohibition is the best way 
to address the unreasonable risk. However, in consideration of the 
challenges several sectors may encounter in adopting alternatives to 
TCE, EPA is proposing longer compliance timeframes for certain uses 
under this prohibition.
    EPA is proposing compliance dates for the proposed prohibitions 
that would come into effect for most industrial and commercial users 
270 days after the publication date of the final rule. However, EPA is 
proposing longer compliance timeframes under this prohibition for some 
industrial and commercial uses and for the associated manufacturing 
(including import), processing, and distribution in commerce. 
Specifically, for two batch vapor degreasing conditions of use (open-
top and closed-loop), EPA is proposing that the compliance dates for 
the proposed prohibitions described in this unit would come into effect 
in 180 days for manufacturers, in 270 days (9 months) for processors, 
specifically for processing into a formulation and for recycling, and 
in 1 year for the industrial and commercial uses of TCE in open-top and 
closed-loop batch vapor degreasers (see Unit III.B.1.c.i. and ii. for 
descriptions of these conditions of use and Unit VI.A.1. for a 
rationale for the slightly longer timeframe). For a sub-set of the 
closed-loop batch vapor degreasing condition of use (industrial and 
commercial use of TCE as a solvent for closed-loop batch vapor 
degreasing for rayon fabric scouring for end use in rocket booster 
nozzle production for Federal agencies and their contractors) EPA is 
proposing that the compliance dates for the proposed prohibitions 
described in this unit would come into effect in five or 10 years for 
manufacturers, processors, distributors, and industrial and commercial 
users, depending on whether the conditions of the phaseout are met (see 
Unit V.A.1.e. for a description of the conditions of this proposed 
exemption, and Unit VI.A.1. for the rationale for this timeframe). 
Also, EPA is proposing that the compliance dates for the proposed 
prohibitions described in this unit would come into effect for 
commercial use of TCE as a processing aid in 1.5 years for 
manufacturers, in 2 years for processors, and in 2 years for industrial 
and commercial use of TCE in: processing aid in process solvent used in 
battery manufacture; process solvent used in polymer fiber spinning, 
fluoroelastomer manufacture and Alcantara manufacture; extraction 
solvent used in caprolactam manufacture; and precipitant used in beta-
cyclodextrin manufacture (see Unit III.B.1.c.xvi. for a description of 
this condition of use and Unit V.A.1. for a rationale for the different 
timeframe).
    To aid with implementation of the compliance dates for the proposed 
prohibitions on manufacturing, processing, and industrial and 
commercial use of TCE, and ensure that those prohibitions effectively 
address the unreasonable risk identified, EPA is also proposing 
prohibitions on distribution in commerce of TCE. Generally, for most 
conditions of use EPA is proposing that the compliance date for the 
proposed prohibition on distributors in commerce of TCE would come into 
effect 180 days (6 months) following publication of the final rule. In 
instances where EPA is proposing a prohibition on manufacturing and 
processing TCE for a particular industrial and commercial use that is 
later than 180 days after publication of the final rule, the compliance 
date for the proposed prohibition on distribution in commerce would be 
the same as the compliance date of the proposed prohibition on 
manufacturing and processing TCE.
    As noted in Unit III.B.1.f., this proposal does not apply to any 
substance excluded from the definition of ``chemical substance'' under 
TSCA section 3(2)(B)(ii) through (vi). EPA requests comment on the 
impacts, if any, that a prohibition on the processing of TCE into a 
formulation, mixture or reaction product in other chemical products and 
preparations, or other aspects of this proposal, may have on the 
production and availability of any pesticide or other substance 
excluded from the TSCA definition of ``chemical substance.'' EPA also 
requests comment on whether it should consider a de minimis level of 
TCE in formulations to account for impurities (e.g., 0.1% or 0.5%) when 
finalizing the prohibitions described in this unit, and, if so, 
information on and rationale for any level that should be considered de 
minimis.
    When proposing the compliance dates described in this unit as 
required under TSCA section 6(d), EPA considered irreversible health 
effects associated with TCE exposure. EPA has no reasonably available 
information indicating that the proposed compliance dates are not 
practicable for the activities that would be prohibited, or that 
additional time is needed for products to clear the channels of trade. 
However, EPA requests comment on whether additional time is needed, for 
example, for products to clear the channels of trade, or for 
implementing the use of substitutes; comments should include 
documentation such as the specific use of the chemical throughout the 
supply chain; concrete steps taken to identify, test, and qualify 
substitutes for those uses (including details on the substitutes tested 
and the specific

[[Page 74734]]

certifications that would require updating); and estimates of the time 
required to identify, test, and qualify substitutes with supporting 
documentation. EPA also requests comment on whether these are the 
appropriate types of information for use in evaluating compliance 
requirements, and whether there are other considerations that should 
apply. EPA may finalize significantly shorter or longer compliance 
timeframes based on consideration of public comments.
c. Prohibitions of Manufacturing, Processing, and Distribution in 
Commerce of TCE for Consumer Use
    The consumer uses evaluated in the 2020 Risk Evaluation for TCE 
constitute all known, intended, and reasonably foreseen consumer uses 
of TCE. As described in this unit, EPA is proposing to prohibit all 
manufacturing (including import) and processing of TCE to address the 
unreasonable risk to workers and ONUs driven by those conditions of use 
(Ref. 2). EPA does not believe any delays are necessary for 
prohibitions on manufacture (including import), processing, or 
distribution in commerce of TCE for consumer use. EPA notes that not 
only did all but one of the 24 consumer uses of TCE evaluated in the 
2020 Risk Evaluation for TCE support the unreasonable risk 
determination for TCE (Refs. 1, 2), but also the manufacture (including 
import) and processing of TCE for consumer uses generally supports 
EPA's unreasonable risk determination for workers and ONUs, as further 
discussed in Unit V.A. For these reasons, and based on considerations 
of the severity of the hazards of TCE, EPA is proposing to prohibit the 
manufacturing (including import), processing, and distribution in 
commerce of TCE for all uses, which includes all consumer uses.
    EPA is proposing that the compliance dates for the proposed 
prohibitions described in this unit relevant to consumer uses would 
come into effect for manufacturers 90 days (3 months) and for 
processors 180 days (6 months) after the publication date of the final 
rule in the Federal Register. EPA is also proposing prohibitions on 
distribution in commerce of TCE for consumer uses to aid with effective 
implementation of the prohibitions on manufacturing and processing, and 
to address the unreasonable risk to consumers and bystanders. EPA 
proposes that the compliance dates for the proposed prohibition on 
distribution in commerce of TCE for consumer use would come into effect 
180 days (6 months) after the publication date of the rule in the 
Federal Register. EPA considered the risk of irreversible health 
effects associated with TCE exposure when proposing these compliance 
dates. EPA has no reasonably available information indicating these 
proposed compliance dates are not practicable for the activities that 
would be prohibited or that additional time is needed for products to 
clear the channels of trade. However, EPA requests comment on whether 
additional time is needed, for example, for products to clear the 
channels of trade, or for implementing the use of substitutes; comments 
should include the considerations described in Unit V.A.1.b. EPA may 
finalize significantly shorter or longer compliance timeframes based on 
consideration of public comments.
    EPA also requests comment on whether it should consider a de 
minimis level of TCE in formulations to account for impurities (e.g., 
0.1% or 0.5%) when finalizing the prohibitions described in this unit, 
and, if so, information on and rationale for any level that should be 
considered de minimis.
d. Phaseout of TCE for Processing as an Intermediate for the 
Manufacture of HFC-134a.
    As described in this unit, EPA is proposing a longer phaseout 
timeframe for the manufacturing (including import) and processing of 
TCE as an intermediate for the manufacture of HFC-134a (1,1,1,2-
Tetrafluroethane; CAS Number 811-97-2). EPA is proposing an 8.5-year 
phaseout subject to the requirements discussed in this unit. All other 
processing of TCE as a reactant/intermediate would be subject to the 
proposed prohibitions described in Unit V.A.1.b. EPA is proposing to 
require a phaseout for processing of TCE as an intermediate for the 
manufacture of HFC-134a, which EPA expects would begin at the final 
rule's effective date and end 8.5 years after the publication of the 
final rule. Associated with this phaseout, EPA would require the 
establishment of the TCE WCPP, outlined in Unit V.A.2., within 6 months 
after publication of the final rule, as workplace protections during 
the period of the phaseout. To set the phaseout volumes, EPA would 
require any facility processing TCE as an intermediate to manufacture 
HFC-134a in the United States to establish a baseline of the annual 
quantity of TCE processed by the facility as a feedstock to manufacture 
HFC-134a. EPA is proposing to require that within 6 months after the 
publication of the final rule the manufacturer could use the average of 
any 12 consecutive months in the 36 months preceding the publication of 
the final rule to calculate their baseline, based on records that 
demonstrate how the baseline annual volume was calculated. Following 
the establishment of a baseline volume, the regulated entity would then 
be required to implement a 4-step phaseout process; specifically, the 
phaseout would be a 25 percent reduction from the baseline volume every 
2 years as follows: (1) 2.5 years after the publication of the final 
rule each manufacturer of HFC-134a who processes TCE as an intermediate 
would not be permitted to process TCE as an intermediate at an annual 
volume greater than 75 percent of the baseline; (2) 4.5 years after the 
publication of the final rule each manufacturer of HFC-134a who 
processes TCE as an intermediate would not be permitted to process TCE 
as an intermediate at an annual volume greater than 50 percent of the 
baseline; (3) 6.5 years after the publication of the final rule each 
manufacturer of HFC-134a who processes TCE as an intermediate would not 
be permitted to process TCE as an intermediate at an annual volume 
greater than 25 percent of the baseline; and (4) 8.5 years after the 
publication of the final rule each manufacturer of HFC-134a would be 
prohibited from processing TCE as an intermediate.
    EPA notes that the prohibition for manufacture (including 
importing), processing, and distribution in commerce of TCE for this 
condition of use would occur after 8.5 years to account for 
availability of TCE through the supply chain during the period of the 
phaseout of processing of TCE as an intermediate for the manufacture of 
HFC-134a. This timeframe would be longer than the prohibitions on 
manufacturing and processing TCE described in Unit V.A.1.a.
    EPA is also proposing to require regulated entities to keep records 
of the annual quantity of TCE purchased and processed from the year 
2023 until the termination of all processing of TCE as an intermediate. 
EPA requests comment on whether additional recordkeeping requirements 
are warranted or additional time would be needed, for example, to begin 
the phaseout of processing TCE as an intermediate for the manufacture 
of HFC-134a.
    EPA notes, per TSCA section 6(c)(2)(C), that although the use of 
TCE to produce HFC-134a would be prohibited eventually due to 
unreasonable risk, the use of PCE to produce HFC-134a is proposed to 
continue in perpetuity under a WCPP (88 FR 39652, July 16, 2023). As 
such, the refrigerant would remain available while protecting workers.

[[Page 74735]]

e. Phaseout of TCE in industrial and Commercial Use as a Solvent for 
Closed-Loop Batch Vapor Degreasing for Rayon Fabric Scouring for Rocket 
Booster Nozzle Production
    EPA is proposing a longer phaseout timeframe for industrial and 
commercial use as a solvent for closed-loop batch vapor degreasing for 
rayon fabric scouring for end use in rocket booster nozzle production 
by Federal agencies and their contractors. This is the industrial and 
commercial use of TCE in a closed-loop batch vapor degreaser to clean, 
or `scour,' rayon fabric to remove sizing (i.e., protective filler or 
glaze on textiles), oils, and other contaminants from the rayon fabric 
that is used to line the inside of rocket booster nozzles; the 
degreasing is essential in preparing the rayon fabric before a 
carbonization process ahead of being used in the rocket booster 
nozzles. If contaminants are not removed properly from the rayon, the 
result could include nozzle failure (Ref. 43). More information on this 
use and the rationale for the phaseout are in Unit VI.A.1. For this 
sub-set of the vapor degreasing condition of use, when conducted by 
Federal agencies and their contractors, EPA is proposing a 10-year 
phaseout subject to the requirements discussed in this unit. (All other 
industrial and commercial use of TCE as a solvent for vapor degreasing, 
including use of TCE in closed-loop batch vapor degreasing of other 
parts or materials, would be subject to the proposed prohibitions 
described in Unit V.A.1.b.). For the phaseout, EPA is proposing that 
within 5 years of the publication date of the final rule the Federal 
agency that is the end user of the rayon fabric for rocket booster 
nozzle production (e.g., the U.S. Department of Defense (DOD) or the 
NASA) would need to conduct a final pre-launch test of rocket boosters 
without using TCE; this test is further discussed in Unit VI.A.1.a. By 
10 years from the publication date of the final rule, the phaseout 
would be complete and industrial and commercial use of TCE as a solvent 
for closed-loop batch vapor degreasing, including for rayon fabric 
scouring for end use in rocket booster nozzle production by Federal 
agencies and their contractors, would be prohibited. As part of this 
phaseout, EPA would require a TCE WCPP, described in Unit V.A.2., 
within 6 months after publication of the final rule, as workplace 
protections during the period of the phaseout until the full 
prohibition takes effect. Additionally, this phaseout would include 
recordkeeping requirements beginning 6 months after publication of the 
final rule related to the rayon fabric scouring for end use in rocket 
booster nozzle production. The entity must have records indicating that 
their closed-loop batch vapor degreasing with TCE is for rayon fabric 
scouring for end use in rocket booster nozzle production for a Federal 
agency or a contractor. Beginning 5 years after the publication of the 
final rule, to continue to use TCE for closed-loop batch vapor 
degreasing for this specific use, the user must have records from a 
Federal agency indicating that a final pre-launch test for the rayon 
fabric scouring has been conducted with an alternative chemical or 
process.
f. Prohibition of Disposal of TCE to Industrial Pre-Treatment, 
Industrial Treatment, or Publicly Owned Treatment Works
    Due to the unreasonable risk to workers exposed to TCE while 
performing industrial wastewater pre-treatment and treatment, EPA is 
proposing to prohibit this mode of disposal of TCE (i.e., generated 
wastewater that contains TCE that is collected on site or transported 
to a third party site, and includes the mixing of TCE with wastewater 
and the discharge of TCE-contaminated wastewater) (description of 
disposal for the purposes of this rulemaking is in Unit III.B.2.d.). 
TSCA section 6(a) provides EPA the authority to prohibit or otherwise 
regulate any manner or method of disposal of a chemical substance by 
its manufacturer, processor, or any other person who uses or disposes 
of it for commercial purposes. EPA is proposing to prohibit the 
disposal of TCE to industrial pre-treatment, industrial treatment, or 
publicly owned treatment works. Facilities generating solid waste with 
TCE concentrations above the RCRA regulatory level of 0.5 mg/L using 
the Toxicity Characteristic Leaching Procedure (see 40 CFR 261.24) 
would need to manage TCE separately from wastewater and dispose of TCE 
through a different disposal mechanism, due to the prohibition in RCRA 
against using dilution as a substitute for appropriate treatment (see 
40 CFR 268.3), while following the appropriate RCRA requirements when 
handling waste containing TCE. Dilution of hazardous waste (including 
by mixing it with wastewater) as a substitution for adequate treatment 
is prohibited under RCRA (see 40 CFR 268.3).
    EPA is proposing that the compliance date for the proposed 
prohibition described in this unit would be 270 days (9 months) after 
the publication date of the final rule for manufacturers, processors, 
distributors, and industrial and commercial users disposing of TCE to 
wastewater. EPA has no information indicating that the proposed 
compliance dates would not be practicable for purposes of finding an 
alternative disposal method, or that additional time would be needed, 
for example, for facilities to transition to an alternative disposal 
method. EPA's understanding is that only 1 percent of TCE is disposed 
of as wastewater. However, EPA requests comment on whether the 270-day 
proposed compliance date is practicable, whether additional time is 
needed, for example, for a regulated entity to implement a change to 
their disposal processes or to transition to alternative disposal 
methods, including what those alternative disposal methods would be, 
and their cost and feasibility. EPA is also proposing, as described in 
Unit V.A.3., a time-limited exemption for 50 years under TSCA section 
6(g) for disposal of TCE to industrial pre-treatment, industrial 
treatment, or publicly owned treatment works for the purpose of cleanup 
projects of TCE-contaminated groundwater and other wastewater.
2. WCPP for Certain Conditions of Use
a. Overview
    As described in Unit III.B.3., EPA is required to issue a 
regulation applying one or more of the TSCA section 6(a) requirements 
to the extent necessary so that the unreasonable risk of injury to 
health or the environment from a chemical substance is no longer 
presented. The TSCA section 6(a) requirements provide EPA the authority 
to limit or restrict a number of activities, alone or in combination, 
including the manufacture, processing, distribution in commerce, 
commercial use, and disposal of the chemical substance. Given this 
authority, EPA may find it appropriate in certain circumstances to 
propose requirements under a WCPP for certain occupational conditions 
of use (e.g., manufacturing, processing, industrial and commercial 
use). However, for the reasons described in Unit VI., including the 
challenges of reliably reducing exposure below the ECEL and being able 
to monitor at the appropriate action level, EPA's proposed requirement 
for the TCE WCPP is that owners or operators ensure that no person is 
exposed to TCE in excess of the ECEL as an 8-hr TWA to the extent 
possible (supported by documentation further described in Unit 
V.A.2.d.i.) rather than (as has been proposed in other rules under TSCA 
section 6) a requirement that exposures do not exceed the ECEL. Due to 
these

[[Page 74736]]

challenges, as well as the severity of the hazard from TCE, EPA notes 
that long-term implementation of the WCPP would not be a feasible means 
of addressing TCE unreasonable risk and thus EPA believes that 
prohibition of the COUs would ultimately be necessary to address the 
unreasonable risk. Furthermore, when selecting among proposed 
prohibitions and other restrictions that would apply to those 
occupational conditions of use, EPA has also factored in considerations 
relating to health effects on PESS, including on older pregnant workers 
and ONUs (the group identified as most susceptible to fetal cardiac 
defects), further discussed in Units V.A.1. and VI.A. For the time 
period before which a prohibition would become effective, for several 
conditions of use, EPA is proposing a TCE WCPP to address to the extent 
possible the unreasonable risk. The WCPP would include a TCE ECEL of 
0.0011 ppm, the associated implementation requirements, and may include 
other components, such as dermal protection, as described in this unit.
    EPA uses the term ``potentially exposed person'' in this unit and 
in the regulatory text to include workers, ONUs, employees, independent 
contractors, employers, and all other persons in the work area who may 
be exposed to TCE under the conditions of use for which a WCPP would 
apply. EPA's intention is to require a comprehensive WCPP that would 
put additional protections in place to reduce the unreasonable risk 
from TCE to potentially exposed persons directly handling the chemical 
or in the area where the chemical is being used, until the prohibition 
compliance date.
    Similarly, the risk evaluation for TCE did not distinguish between 
employers, contractors, or other legal entities or businesses that 
manufacture, process, distribute in commerce, use, or dispose of TCE. 
EPA uses the term ``owner or operator'' to describe the entity 
responsible for implementing the WCPP for workplaces where an 
applicable condition of use is occurring and TCE is present. The term 
includes any person who owns, leases, operates, controls, or supervises 
such a workplace.
    An ECEL is a risk-based inhalation exposure threshold. The ECEL 
would be accompanied by monitoring, training, recordkeeping, and other 
requirements so that exposures to TCE are reduced to the extent 
possible (as supported by documentation further described in Unit 
V.A.2.d.i.). With an ECEL, the WCPP provides the least uncertainty 
regarding the protection afforded to workers, requires regulated 
entities to consider more protective controls in the hierarchy, and 
lessens the burden on workers. Under this proposal, regulated entities 
would have some flexibility in the manner in which they implement 
modifications, within certain parameters outlined in this unit, or 
otherwise aim to prevent exceedances of the ECEL at their facilities. 
Therefore, EPA generally refers to the ECEL and ancillary requirements 
as a non-prescriptive approach. This unit includes a summary of the 
proposed TCE WCPP, including a description of the proposed ECEL of 
0.0011 ppm; proposed implementation requirements and an EPA ECEL action 
level; proposed monitoring requirements; a description of potential 
exposure controls, which consider the hierarchy of controls; 
information that may be used to inform respirator selection; proposed 
glove requirements; and additional requirements proposed for 
recordkeeping, and worker training, participation, and notification. 
This unit also describes proposed compliance timeframes for these 
proposed requirements.
    EPA does not believe that long-term implementation of the WCPP 
would be a feasible means of addressing unreasonable risk indefinitely; 
thus prohibition of the use of TCE for affected COUs is ultimately 
necessary to address the risk so that it is no longer unreasonable, due 
to the severity of the hazard, the magnitude of the exposures, and the 
challenges of consistently reducing exposures below the low TCE ECEL in 
a way that is consistent with the hierarchy of controls, further 
described in Unit VI.A.1. However, for the conditions of use which 
would continue for longer than a year, as well as during the proposed 
TSCA section 6(g) time-limited exemption, EPA is proposing the WCPP to 
reduce to the extent possible the unreasonable risk from TCE during the 
time period before compliance dates for the proposed prohibition would 
come into effect. EPA is not proposing the WCPP for uses that would be 
prohibited within 1 year from the effective date of the final rule. 
Based on reasonably available information, EPA expects that the ECEL is 
likely to be exceeded and that compliance with the WCPP would require 
large investments into PPE and engineering controls at facilities. For 
this reason, EPA's proposal aims to encourage facilities engaged in 
uses that would be prohibited within a year from finalization to focus 
their resources on the transition to alternatives to TCE. EPA is 
requesting comment on how entities could demonstrate that they are 
reducing exposures to the extent possible (including considerations for 
technological feasibility) and is also requesting comment on whether 
EPA's requirement should be that entities ensure that exposures are 
reduced below the ECEL, rather than to the extent possible or lowest 
achievable level described further in Unit V.A.2.d.i. Should regulated 
entities be able to consistently demonstrate compliance with an ECEL 
through effective controls, EPA requests comments regarding replacing 
the proposed prohibitions with compliance with the WCPP.
b. Existing Chemical Exposure Limit (ECEL)
i. ECEL and ECEL Action Level
    To reduce exposures in the workplace and eliminate the unreasonable 
risk of injury to health resulting from inhalation exposures to TCE 
identified under the occupational conditions of use in the TSCA 2020 
Risk Evaluation for TCE, EPA is proposing an ECEL of 0.0011 parts per 
million (ppm) (0.0059 mg/m\3\) for inhalation exposures to TCE as an 8-
hour TWA. As described in Unit IV.A., this ECEL is based on 
developmental toxicity, the most sensitive acute and chronic non-cancer 
health endpoint, specifically calculated based on the occupational 
acute, non-cancer human equivalent concentration (HEC) for fetal 
cardiac defects (Ref. 13). EPA is proposing to establish requirements 
for an ECEL as part of the WCPP until the prohibition compliance date 
for certain conditions of use that would be permitted to continue for 
longer than a year after the effective date of the final rule, 
including the conditions of use described in Unit V.A.1.a., as well as 
the conditions of use that would be subject to the phaseout described 
in Unit V.A.1.d. and the TSCA section 6(g) exemptions described in Unit 
V.A.3.
    Each owner or operator of a workplace where these conditions of use 
occur would be responsible for compliance with the ECEL and the 
associated requirements. EPA's description for how the requirements 
related to an ECEL would reduce the unreasonable risk resulting from 
inhalation exposures and the rationale for this regulatory approach is 
outlined in Units III.B.3. and V.A.
    In order for this rulemaking to appropriately reduce risk to all 
potentially exposed persons that may be exposed to TCE through the 
occupational conditions of use for which EPA is proposing compliance 
with the WCPP as a protection measure,

[[Page 74737]]

EPA has factored in consideration of additional health effects 
applicable to PESS pursuant to TSCA section 6(c)(2), outlined in Unit 
VI.A. EPA developed the ECEL for the most sensitive health endpoint 
(fetal cardiac defects) in support of risk management efforts on TCE 
under TSCA, to identify at what level ambient exposures would protect 
against unreasonable risk of injury to health due to fetal cardiac 
defects. The level identified is an 8-hour ECEL of 0.0011 ppm, which, 
when possible to achieve, is the concentration at which an adult human 
would be unlikely to experience the specified adverse effects if 
exposed during a working lifetime, including susceptible 
subpopulations. In addition, at the acute non-cancer ECEL of 0.0011 
ppm, any potentially exposed person in the workplace would be protected 
against other non-cancer effects resulting from occupational exposures, 
as well as excess risk of cancer (Ref. 13). However, as noted in Unit 
IV., EPA does not believe that long-term implementation of the WCPP 
with this low ECEL would be a feasible means of addressing unreasonable 
risk indefinitely, and EPA is uncertain if the ECEL and associated 
action level can be met reliably as discussed further in Unit VI.A.1.
    EPA invites comment on the existing practices (e.g., engineering 
controls, administrative controls, PPE) involving TCE for the 
conditions of use listed in Unit V.A.1.a., Unit V.A.1.d., and Unit 
V.A.3., whether activities may take place in closed systems, and the 
degree to which users of TCE in these sectors could successfully 
implement the WCPP, including an ECEL of 0.0011 ppm for TCE, dermal 
protection, and ancillary requirements described in Unit IV.A. EPA 
acknowledges that reducing and accurately detecting exposures from the 
current OSHA PEL of 100 ppm to the proposed TSCA ECEL of 0.0011 ppm 
would be very difficult. EPA also invites comment on the potential to 
develop future technologies (e.g., engineering controls, administrative 
controls, PPE) involving TCE for the conditions of use listed in Unit 
V.A.1.a., Unit V.A.1.d., and Unit V.A.3., that would facilitate 
successful implementation of the WCPP, including an ECEL of 0.0011 ppm 
for TCE, dermal protection, and ancillary requirements described in 
Unit IV.A. EPA is also requesting comment on the feasibility of 
controlling worker exposures to TCE at or below the proposed ECEL, and 
the accuracy of measurements at this level. This is important for 
determining whether there are realistic and effective exposure controls 
that can be used by industry for effectively controlling exposures to 
levels at or below the ECEL. To the extent time is needed to ensure 
methods are available to accurately measure TCE at or below the ECEL, 
EPA is requesting comment on whether a phased approach to an ECEL is 
desirable; that is, an approach that would establish a timeframe for 
meeting the ECEL as well as a shorter timeframe for meeting a 
concentration level higher than the ECEL (but lower than the PEL) that 
is currently considered achievable. EPA welcomes data or information to 
demonstrate that meeting the proposed ECEL over a sustained period of 
time would be feasible and measurable.
    EPA is also proposing to establish an ECEL action level of 0.00055 
ppm as an 8-hour TWA for TCE. Air concentrations at or above the action 
level would trigger more frequent periodic monitoring of exposures to 
TCE, as described in this unit. EPA is proposing to adopt the action 
level approach in implementing the TSCA ECEL, similar to the action 
level approach used by OSHA in the implementation of OSHA standards, 
although the values differ due to differing statutory authorities. As 
explained by OSHA, due to the variable nature of employee exposures, 
compliance with an action level provides employers with greater 
assurance that their employees will not be exposed to concentrations 
above the PELs (Ref. 44). EPA agrees with this reasoning and, like 
OSHA, expects the inclusion of an ECEL action level will stimulate 
innovation within industry to reduce exposures to levels below the 
action level. Therefore, EPA has identified a need for an action level 
for TCE and is proposing a level that would be half the 8-hour ECEL, 
which is in alignment with the precedented approach established under 
most OSHA standards. EPA is soliciting comment regarding an ECEL action 
level that is half the ECEL and any associated provisions related to 
the ECEL action level when the ECEL is significantly lower than the 
OSHA PEL. EPA is also soliciting comment on whether the ECEL action 
level should be aligned with OSHA PEL action levels (typically set at 
half the limit) due to the fact that PEL accounts for technological 
feasibility and the action level is not necessarily designed to be 
health protective. Since exposure below the ECEL would be health 
protective, EPA seeks comment on whether the action level should be set 
at a different value closer to the ECEL that would trigger increased 
monitoring to ensure that the ECEL is not exceeded, and whether 
technological feasibility should be considered in setting the action 
level.
    In summary, EPA is proposing that each owner or operator of a 
workplace subject to compliance with the TCE WCPP must ensure that no 
person is exposed to an airborne concentration of TCE in excess of 
0.0011 ppm (0.0059 mg/m3) as an 8-hour TWA (ECEL), with an action level 
identified as 0.00055 ppm (0.0029 mg/m3) (ECEL action level) to the 
extent possible, as supported by documentation further described in 
Unit V.A.2.d.i.). For conditions of use for which the requirements to 
comply with the WCPP are being proposed, EPA expects that measurement 
of extremely low-ppm levels of TCE may present challenges to the 
regulated community. During the development of the TCE ECEL, EPA 
conducted a search to identify relevant NIOSH, OSHA, and EPA analytical 
methods that may be used to monitor for the presence of TCE in indoor 
air. While EPA identified analytical methods that may be used, based on 
information from stakeholders, EPA also recognizes that it may be 
difficult to operationalize routine use of these methods for detection 
at the low levels needed for the TCE ECEL and ECEL action level. 
Specifically, these methods may be challenging to use for personal 
breathing zone monitoring to detect lower air concentration levels at 
the ECEL and ECEL action level based on the developmental toxicity 
endpoint for fetal cardiac defects (Ref. 13). However, EPA acknowledges 
that in recent years commercial passive air sampling devices have 
improved and may be available for use for personal air sampling at 
extremely low-ppm levels of TCE (Ref. 45). EPA is requesting comment on 
personal air sampling devices that are capable of detecting indoor air 
TCE concentrations at or below the ECEL action level of 0.00055 ppm 
(0.0029 mg/m3) with the requisite precision and accuracy.
    EPA acknowledges that the challenge of suitable personal breathing 
zone monitoring methods to detect TCE air concentration levels at the 
ECEL of 0.0011 ppm and ECEL action level of 0.00055 ppm could cause 
difficulty in determining whether a workplace is in compliance with the 
ECEL. EPA is therefore requesting comment on whether to require 
compliance with an interim exposure level based on the limit of 
detection of established analytical methods. This interim level, unlike 
the ECEL, would not necessarily eliminate unreasonable risk, but rather 
reduce risk to an extent that corresponds to the air concentration that 
current analytical methods can reliably measure to and would be the 
exposure

[[Page 74738]]

limit during the period in which TCE is still in use until its eventual 
prohibition. EPA requests comment on setting such an interim level for 
TCE based on a limit of detection that is the lowest limit of detection 
using analytical methods developed by OSHA/NIOSH for personal breathing 
zone monitoring. More specifically, EPA requests comment on using OSHA 
Method 1001, which has a personal breathing zone limit of detection for 
TCE of 18 ppb, or 0.018 ppm, to set an interim exposure limit of 0.036 
ppm, with an action level of 0.018 ppm (Ref. 46).
    Under this approach, EPA would initially establish an exposure 
value that would be technically feasible to detect in the near-term, 
with a step down to the ECEL at a later date, until the applicable 
prohibition would take effect. This approach would significantly reduce 
exposures to TCE from the current OSHA PEL of 100 ppm by establishing 
an interim exposure value of 0.036 ppm and action level of 0.018 ppm, 
until advancements in technologies reliably support measurement at the 
ECEL or below. EPA requests comments that provide supported 
recommendations for one or more incremental exposure values and 
associated timelines for achieving the incremental exposure levels and 
the currently proposed ECEL of 0.0011 ppm, and comments that consider 
and provide information on the needed advancements in exposure 
monitoring methods, analytical methods, and exposure controls, 
including expected timelines for developing these capabilities.
    The proposed requirements would be applicable to owners and 
operators of workplaces where manufacturing (including import), 
processing, and industrial and commercial use of TCE would be permitted 
to continue more than 1 year after the publication of the final rule. 
The proposed requirements would be applicable from the date of 
publication of the final rule until the prohibition compliance date for 
those conditions of use. However, the proposed requirements of the WCPP 
would not be applicable to owners and operators of workplaces where EPA 
is proposing to prohibit manufacturing and processing for certain 
industrial and commercial use and consumer uses within 1 year of the 
effective date of the final rule. The WCPP would also not be applicable 
to owners and operators of workplaces where EPA is proposing to 
prohibit distribution in commerce or disposal to industrial pre-
treatment, industrial treatment, or publicly owned treatment works.
    As described further in Unit VI.A.1., EPA believes that long-term 
implementation of the WCPP for continued use of TCE is not a feasible 
means of addressing unreasonable risk such that prohibition ultimately 
would be necessary to address the unreasonable risk.
ii. Monitoring Requirements
    Overview. Monitoring requirements are a key component of 
implementing EPA's proposed WCPP. Initial monitoring for TCE would be 
critical for establishing a baseline of exposure for potentially 
exposed persons and for identifying the lowest achievable exposure 
level in a facility; similarly, periodic exposure monitoring would 
assure that exposures continue to be reduced to the lowest level 
achievable so that unreasonable risk of injury is reduced for 
potentially exposed persons in the workplace. Periodic exposure 
monitoring frequency could change if certain conditions are met, which 
are described in this unit. Additionally, in some cases, a change in 
workplace conditions with the potential to impact exposure levels would 
warrant additional monitoring, which is also described. To ensure 
compliance with monitoring activities, EPA proposes exposure monitoring 
recordkeeping requirements outlined in this unit.
    Initial exposure monitoring. Under the proposed regulation, each 
owner or operator of a workplace where any condition of use subject to 
a WCPP is occurring would be required to perform initial exposure 
monitoring to determine the extent of exposure of potentially exposed 
persons to TCE. Initial monitoring would notify owner or operators of 
the magnitude of possible exposures, to their potentially exposed 
persons with respect to their unique work conditions and environments. 
The results of the initial exposure monitoring would be used to help 
determine the lowest achievable level in a facility, the frequency of 
future periodic monitoring, whether additional exposure controls are 
necessary (such as engineering controls, administrative controls, and/
or respiratory protection), and whether the owner or operator would 
need to demarcate a regulated area as described in this unit.
    EPA is proposing to require each owner or operator to establish an 
initial baseline monitoring sample to determine the magnitude of 
exposure for all persons who may be exposed to TCE within 180 days (6 
months) after the date of publication of the final rule in the Federal 
Register. Where TCE is present in the workplace, each owner or operator 
would be required to determine each potentially exposed person's 
exposure by either taking a personal breathing zone air sample of each 
potentially exposed person or taking personal breathing zone air 
samples that are representative of each potentially exposed person's 
exposure performing the same or substantially similar operations in 
each work shift, in each job classification, and in each work area 
(hereinafter identified as an ``exposure group''). Representative 8-
hour TWA exposures must be determined based on one or more samples 
representing full-shift exposures for each shift for each person in 
each job classification in each work area. Monitoring samples must be 
taken when and where the operating conditions are best representative 
of each potentially exposed person's full-shift exposures, and also 
must represent the highest TCE exposures likely to occur under 
reasonably foreseeable conditions of use. EPA expects that owners and 
operators would attempt to monitor a baseline for all of the tasks 
during the same timeframe; however, EPA understands that certain tasks 
occur less frequently, and EPA is soliciting comments regarding the 
timing of the initial exposure monitoring so that it would be 
representative of all tasks involving TCE where exposures may approach 
the ECEL. If the owner or operator chooses a representative sample, 
such sampling must include persons that are the closest to the source 
of TCE, so that the monitoring results are representative of the most 
highly exposed persons in the workplace. EPA is also soliciting 
comments regarding use of area source monitoring instead of personal 
breathing zone as a representative sample of exposures.
    EPA also recognizes that some entities may already have exposure 
monitoring data. If the owner or operator has monitoring data conducted 
within five years prior to the effective date of the final rule and the 
monitoring would satisfy the monitoring requirements described in this 
unit, including the requirement that the data represent the highest TCE 
exposures likely to occur under reasonably foreseeable conditions of 
use, the owner or operator may rely on such earlier monitoring results 
for the initial baseline monitoring sample.
    EPA proposes to require each owner or operator to perform exposure 
monitoring to identify the lowest achievable exposure level in relation 
to the ECEL value, and ensure to the extent possible (supported by 
documentation further described in Unit V.A.2.d.i) that no person is 
exposed to an airborne concentration of TCE in exceedance of

[[Page 74739]]

the ECEL. EPA requests comment on how owners and operators should 
identify the lowest achievable exposure level, what documentation would 
be needed to support that further reductions are not possible, and 
whether EPA should provide a definition of meeting the ECEL to the 
extent possible. Additionally, EPA requests comment on whether current 
monitoring methods (Ref. 13) are able to detect airborne concentrations 
at the ECEL and action level values. EPA expects that detection and 
adherence to extremely low-ppm levels of TCE may present challenges to 
some in the regulated community; therefore, EPA is also requesting 
comment on whether EPA should propose specific requirements following 
results indicating non-detectable concentrations of TCE (non-detects), 
or a requirement that a specific monitoring method be used.
    Periodic exposure monitoring. EPA is proposing to require each 
owner or operator to conduct, for those exposure groups that exceed the 
following airborne concentration levels, the following periodic 
monitoring:
     If all samples taken during the initial exposure 
monitoring reveal a concentration below the ECEL action level (0.00055 
ppm 8-hour TWA), the owner or operator must repeat the periodic 
exposure monitoring at least once every five years.
     If the initial or most recent exposure monitoring 
indicates that airborne exposure is above the ECEL (0.0011 ppm 8-hour 
TWA), the owner or operator must repeat the periodic exposure 
monitoring within 3 months of the most recent exposure monitoring.
     If the most recent exposure monitoring indicates that 
airborne exposure is at or above the ECEL action level (0.00055 ppm 8-
hour TWA) but at or below the ECEL (0.0011 ppm 8-hour TWA), the owner 
or operator must repeat the periodic exposure monitoring within 6 
months of the most recent exposure monitoring.
     If the most recent (non-initial) exposure monitoring 
indicates that airborne exposure is below the ECEL action level, the 
owners or operators must repeat such monitoring within 6 months of the 
most recent monitoring until two consecutive monitoring measurements 
taken at least seven days apart, are below the ECEL action level 
(0.00055 ppm 8-hour TWA), at which time the owner or operator must 
repeat the periodic exposure monitoring at least once every 5 years.
    Additionally, in instances where an owner or operator does not 
manufacture, process, distribute, or use TCE for a condition of use for 
which the WCPP is proposed over the entirety of time since the last 
required periodic monitoring event, EPA is proposing that the owner or 
operator would be permitted to forgo the next periodic monitoring 
event. However, documentation of cessation of use of TCE would be 
required and periodic monitoring would be required to resume should the 
owner or operator restart any of the conditions of use listed in Unit 
V.A.2. for which the WCPP is proposed as a workplace protection 
measure.
    The proposed periodic monitoring requirements are also outlined in 
Table 1. EPA requests comment on the timeframes for periodic monitoring 
outlined in this unit. EPA may finalize significantly shorter or longer 
compliance timeframes based on consideration of public comments. EPA 
requests comment on the ability for a facility to perform the proposed 
periodic monitoring requirements, specifically whether monitoring 
methods can detect the ECEL action level and ECEL value.

                Table 1--Periodic Monitoring Requirements
------------------------------------------------------------------------
      Air concentration condition        Periodic monitoring requirement
------------------------------------------------------------------------
If all initial exposure monitoring is    Periodic exposure monitoring is
 below the ECEL action level (<0.00055    required at least once every 5
 ppm 8-hour TWA).                         years.
If the initial or most recent exposure   Periodic exposure monitoring is
 monitoring indicates that airborne       required within 3 months of
 exposure is above the ECEL (>0.0011      the most recent exposure
 ppm 8-hour TWA).                         monitoring.
If the initial or most recent exposure   Periodic exposure monitoring is
 monitoring indicates that airborne       required within 6 months of
 exposure is at or above the ECEL         the most recent exposure
 action level but at or below the ECEL    monitoring.
 (>=0.55 ppb 8-hour TWA, <=0.0011 ppm 8-
 hour TWA).
If the two most recent (non-initial)     Periodic exposure monitoring is
 exposure monitoring measurements,        required within 5 years of the
 taken at least seven days apart within   most recent exposure
 a 6-month period, indicate that          monitoring.
 airborne exposure is below the ECEL
 action level (<0.00055 ppm 8-hour TWA).
If the owner or operator engages in a    The owner or operator may forgo
 condition of use for which compliance    its current periodic
 with the WCPP would be required but      monitoring event. However,
 does not manufacture, process, use, or   documentation of cessation of
 dispose of TCE in that condition of      use of TCE as well as periodic
 use over the entirety of time since      monitoring would be required
 the last required monitoring event.      when the owner or operator
                                          resumes or starts any of the
                                          conditions of use for which
                                          compliance with the WCPP is
                                          proposed.
------------------------------------------------------------------------

    Additional exposure monitoring. In addition to the initial and 
periodic exposure monitoring, EPA is proposing that each owner or 
operator conduct additional exposure monitoring whenever a change in 
the production, process, control equipment, personnel, or work 
practices that may reasonably be expected to result in new or 
additional exposures at or above the ECEL action level, or when the 
owner or operator has any reason to believe that new or additional 
exposures at or above the ECEL action level have occurred. In the event 
of start-up, shutdown, spills, leaks, ruptures or other breakdowns that 
may lead to employee exposure, EPA is proposing that each owner or 
operator must conduct additional initial exposure monitoring to 
potentially exposed persons (using personal breathing zone sampling) 
after the cleanup of the spill or repair of the leak, rupture or other 
breakdown. An additional exposure monitoring event may result in an 
increased frequency of periodic monitoring. For example, if the initial 
monitoring results from a workplace are above the ECEL action level, 
but below the ECEL, periodic monitoring is required every 6 months. If 
additional monitoring is performed because increased exposures are 
suspected, and the results are above the ECEL, subsequent periodic 
monitoring would have to be performed every 3 months. The required 
additional exposure monitoring should not delay implementation of any 
necessary cleanup or other remedial action to reduce the exposures to 
persons in the workplace.

[[Page 74740]]

    Other monitoring requirements. For each monitoring event, EPA is 
proposing to require owners or operators ensure that their methods be 
accurate, to a confidence level of 95 percent, to within plus or minus 
25 percent for airborne concentrations of TCE. Also, EPA is proposing 
to require use of appropriate sampling and analytical methods used to 
determine TCE exposure, including as relevant: (A) Use of an analytical 
method already approved by EPA, OSHA or NIOSH, or another analytical 
method that has been demonstrated to meet the proposed accuracy 
requirement at an appropriate limit of detection for the ECEL and ECEL 
action level; (B) Compliance with the Good Laboratory Practice 
Standards at 40 CFR part 792. Additionally, EPA is proposing to require 
owners and operators to re-monitor within 15 working days after receipt 
of the results of any exposure monitoring when results indicate non-
detect or air monitoring equipment malfunction, unless an Environmental 
Professional as defined at 40 CFR 312.10 or a Certified Industrial 
Hygienist reviews the monitoring results and determines re-monitoring 
is not necessary.
    EPA is also proposing to require that each owner or operator 
maintain exposure monitoring records that include the following 
information for each monitoring event:
    (A) Dates, duration, and results of each sample taken;
    (B) All measurements that may be necessary to determine the 
conditions (e.g., work site temperatures, humidity, ventilation rates, 
monitoring equipment type and calibration dates) that may affect the 
monitoring results;
    (C) Name, workplace address, work shift, job classification, and 
work area of the person monitored; documentation of all potentially 
exposed persons whose exposures the monitoring is intended to represent 
if using a representative sample; and type of respiratory protective 
device worn by the monitored person, if any;
    (D) Use of appropriate sampling and analytical methods, such as 
analytical methods already approved by EPA, OSHA or NIOSH, or 
compliance with an analytical method verification procedure;
    (E) Compliance with the Good Laboratory Practice Standards at 40 
CFR part 792; and
    (F) Information regarding air monitoring equipment, including: 
type, maintenance, calibrations, performance tests, limits of 
detection, and any malfunctions.
iii. Incorporation of the Hierarchy of Controls
    EPA is proposing to require owners or operators to implement the 
WCPP in accordance with the hierarchy of controls and encourages the 
use of pollution prevention to control exposures whenever practicable. 
Pollution prevention, also known as source reduction, is any practice 
that reduces, eliminates, or prevents pollution at its source (e.g., 
elimination and substitution). Similarly, the hierarchy of controls 
includes, in order of preference, elimination, substitution, 
engineering controls, and administrative controls, prior to relying on 
PPE as a means of controlling exposures (Ref. 12). EPA is proposing to 
require owners or operators to reduce inhalation exposures below the 
ECEL in accordance with the hierarchy of controls to the extent 
possible as supported by documentation further described in Unit 
V.A.2.d.i.). EPA expects that, for conditions of use for which EPA is 
proposing a WCPP as a protection measure, compliance at most workplaces 
would be part of an existing industrial hygiene program. Workplaces 
would have to institute one or a combination of elimination, 
substitution, engineering controls, or administrative controls to 
reduce exposures to the extent feasible (Ref. 12). If an owner or 
operator chooses to replace TCE with a substitute, EPA recommends that 
they carefully review the available hazard and exposure information on 
the potential substitutes to avoid a regrettable substitution.
    If an effort to identify and implement feasible exposure controls, 
in accordance with the hierarchy of controls, such as elimination, 
substitution, engineering controls, and administrative controls is 
found not to be sufficient to reduce exposures to or below the ECEL for 
all persons in the workplace, EPA proposes to require each owner or 
operator to use such controls to reduce TCE concentrations in the 
workplace to the lowest levels achievable and, only after levels cannot 
be further reduced, supplement these controls using respiratory 
protection before persons are permitted to enter a regulated area, as 
described in this unit. In such cases, EPA would require that the owner 
or operator provide those persons exposed or who may be exposed to TCE 
by inhalation above the ECEL with respirators so that exposures can be 
reduced to the extent possible (supported by documentation further 
described in Unit V.A.2.d.i.). EPA also proposes to require that each 
owner or operator document their evaluation of elimination, 
substitution, engineering and administrative exposure control 
strategies and, if applicable, the reasons why they found these 
strategies infeasible to control exposures below the ECEL, in an 
exposure control plan as described in this unit. In addition, a 
regulated entity would be prohibited from rotating work schedules of 
potentially exposed persons to comply with the ECEL 8-hour TWA. EPA may 
require more, less, or different documentation regarding exposure 
control strategies in the final rule based on consideration of public 
comments. The Agency understands that certain engineering controls can 
reduce exposures to people inside the workplace but may lead to 
increased ventilation of TCE outside of the workplace, thereby 
potentially increasing risks of adverse health effects from exposures 
to TCE in ambient air to people in fenceline communities. EPA expects 
that processing and commercial use of TCE for the conditions of use for 
which the WCPP would apply will decrease ahead of the prohibition 
compliance dates (Ref. 3) and therefore expects that any risks to 
fenceline communities would also decrease. More information on EPA's 
analysis of ambient air and water pathways is in Unit VII.A. To 
understand more fully the potential impacts to fenceline communities of 
requirements to reduce workplace exposure to TCE, EPA is requesting 
comment on whether industry anticipates increased releases of TCE to 
outdoor air associated with the implementation of the WCPP. In order to 
avoid unintended increases in exposures to people from TCE emissions to 
ambient air, EPA requests comment on whether owners and operators 
should be required to attest in their exposure control plan that 
engineering controls selected do not increase emissions of TCE to 
ambient air outside of the workplace and document in their exposure 
control plan whether additional equipment was installed to capture 
emissions of TCE to ambient air. EPA requests comment on how such a 
requirement could impact the availability, feasibility, or cost of 
engineering controls as a means to reduce workplace exposures to or 
below the proposed ECEL.
iv. Regulated Area
    Based on the exposure monitoring, EPA is proposing to require that 
owners or operators of workplaces subject to a WCPP as a protection 
measure demarcate any area where airborne concentrations of TCE exceed 
or are reasonably expected to exceed the ECEL. Regulated areas would be

[[Page 74741]]

demarcated using administrative controls, such as warning signs or 
highly visible signifiers, in multiple languages as appropriate (e.g., 
based on languages spoken by potentially exposed persons), placed in 
conspicuous areas, and documented through training and recordkeeping. 
The owner or operator would be required to restrict access to the 
regulated area from anyone who is not an authorized user, which 
includes any potentially exposed person that lacks proper training, is 
not wearing required PPE as described in this unit or is otherwise 
unauthorized to enter. EPA is proposing to require owners and operators 
demarcate a regulated area, beginning 9 months after the date of 
publication of the final rule, or within 3 months after receipt of any 
exposure monitoring that indicates exposures exceeding the ECEL. EPA is 
soliciting comment on requiring warning signs to demarcate regulated 
areas, such as the requirements found in OSHA's General Industry 
Standard for Beryllium (29 CFR 1910.1024(m)(2)). EPA is also requesting 
comment on whether the owner or operator should be required to permit 
designated representatives of employees and other workers to enter 
regulated areas to observe exposure monitoring similar to typical OSHA 
Standard requirements, e.g., 29 CFR 1910.1024(d)(7).
v. Notification of Monitoring Results
    EPA proposes that the owner or operator must, within 15 working 
days after receipt of the results of any exposure monitoring, notify 
each person whose exposure is represented by that monitoring in 
writing, either individually to each potentially exposed person or by 
posting the information in an appropriate and accessible location, such 
as public spaces or common areas, outside the regulated area. This 
notice must include the exposure monitoring results, identification and 
explanation of the ECEL and ECEL action level in plain language, 
identification of the lowest achievable exposure level, if applicable, 
any corresponding required respiratory protection, if applicable, the 
quantity, location, manner of TCE use and identified releases of TCE 
that could result in exposure to TCE, and whether the airborne 
concentration of TCE exceeds the ECEL. The notice must also include a 
description of actions taken by the owner or operator to reduce 
inhalation exposures to or below the ECEL, if applicable, or refer to a 
document available to the potentially exposed persons which states the 
actions to be taken to reduce exposures. The notice would be required 
to be posted in multiple languages if necessary (e.g., notice must be 
in a language that the potentially exposed person understands, 
including a non-English language version representing the language of 
the largest group of workers who cannot readily comprehend or read 
English).
c. Personal Protective Equipment (PPE) Program
    Where elimination, substitution, engineering controls, and 
administrative controls are not feasible to reduce the air 
concentration to or below the ECEL for all potentially exposed persons, 
EPA is proposing to require implementation of a PPE program in 
alignment with OSHA's General Requirements for Personal Protective 
Equipment at 29 CFR 1910.132. Consistent with 29 CFR 1910.132, owners 
and operators would be required to provide PPE, including respiratory 
protection and dermal protection selected in accordance with the 
guidelines described in this unit, that is of safe design and 
construction for the work to be performed. EPA is proposing to require 
owners and operators ensure each potentially exposed person who is 
required by this unit to wear PPE to use and maintain PPE in a 
sanitary, reliable, and undamaged condition. Owners and operators would 
be required to select and provide PPE that properly fits each 
potentially exposed person who is required by this unit to use PPE and 
communicate PPE selections to each affected person.
    As part of the PPE program, EPA is also proposing that owners and 
operators must comply with OSHA's general PPE training requirements at 
29 CFR 1910.132(f) for application of a PPE training program, including 
providing training on proper use of PPE (e.g., when and where PPE is 
necessary, proper application, wear, and removal of PPE, maintenance, 
useful life, and disposal of PPE). EPA is proposing that owners and 
operators would provide PPE training to each potentially exposed person 
who is required by this unit to wear PPE prior to or at the time of 
initial assignment to a job involving potential exposure to TCE. Owners 
and operators would also have to re-train each affected person at least 
once annually or whenever the owner or operator has reason to believe 
that a previously trained person does not have the required 
understanding and skill to properly use PPE, or when changes in the 
workplace or in the PPE to be used render the previous training 
obsolete.
    This unit includes a description of the PPE Program, including 
proposed PPE as it relates to respiratory protection, proposed PPE as 
it relates to dermal protection, and other proposed requirements such 
as additional training for respirators and recordkeeping to support 
implementation of a PPE program.
i. Respiratory Protection
    Where elimination, substitution, engineering and administrative 
controls are not feasible to reduce the air concentration to or below 
the ECEL, EPA proposes to set minimum respiratory PPE requirements 
based on an entity's most recent measured air concentration and the 
level of PPE that EPA determined would be needed to reduce exposure to 
the ECEL. In those circumstances, EPA is proposing to require a 
respiratory protection PPE program with worksite-specific procedures 
and elements for required respirator use. The respiratory protection 
PPE program proposed by EPA would be based on the most recent exposure 
monitoring concentration measured as an 8-hour TWA and would be 
administered by a suitably trained program administrator. EPA is also 
proposing to require each owner or operator select respiratory 
protection in accordance with the guidelines described in this unit and 
29 CFR 1910.134(a) through (l), except (d)(1)(iii), for proper 
respirator use, maintenance, fit-testing, medical evaluation, and 
training. EPA is not proposing to cross reference 29 CFR 
1910.134(d)(1)(iii) because the WCPP contains requirements for 
identifying TCE respiratory hazards in the workplace.
    Required Respiratory Protection. EPA is proposing to require each 
owner or operator supply a respirator, selected in accordance with this 
unit, to each person who enters a regulated area within 3 months after 
the receipt of any exposure monitoring that indicates exposures 
exceeding the ECEL and thereafter must ensure that all persons within 
the regulated area are using the provided respirators whenever TCE 
exposures exceed or can reasonably be expected to exceed the ECEL. 
Given the risks associated with TCE exposure above the ECEL, prompt 
compliance with the respiratory protection requirements is important, 
but EPA expects that most owners or operators will need some time after 
the exposure monitoring results are received to acquire the correct 
respirators and establish a respiratory protection program, including 
training, fit-testing, and medical evaluations. While EPA believes that 
3 months should be sufficient for this purpose, EPA is seeking comment 
on whether this timeframe should be shorter (e.g.,

[[Page 74742]]

within two weeks after the receipt of any exposure monitoring that 
indicates exposure exceeding the ECEL), given the severity of the 
effect. EPA is also proposing that owners or operators who would be 
required to administer a respiratory protection program must supply a 
respirator selected in accordance with 29 CFR 1910.134(d)(1) (except 
(d)(1)(iii)). Additionally, EPA is proposing that the owner or operator 
must ensure that all filters, cartridges, and canisters used in the 
workplace are labeled and color coded with the NIOSH approval label and 
that the label is not removed and remains legible. 29 CFR 
1910.134(d)(3)(iii), which EPA is proposing to cross-reference, 
requires either the use of respirators with an end-of-life service 
indicator certified by NIOSH for the contaminant, in this case TCE, or 
implementation of a change schedule for canisters and cartridges that 
ensures that they are changed before the end of their service life. EPA 
is requesting comment on whether there should be a requirement to 
replace cartridges or canisters after a certain number of hours, such 
as the requirements found in OSHA's General Industry Standard for 1,3-
Butadiene (29 CFR 1910.1051(h)), or a requirement for a minimum service 
life of non-powered air-purifying respirators such as the requirements 
found in OSHA's General Industry Standard for Benzene (29 CFR 
1910.1028(g)(3)(D)).
    EPA is proposing the following requirements for respiratory 
protection, based on the exposure monitoring concentrations measured as 
an 8-hour TWA that exceed the ECEL (0.0011 ppm). EPA is proposing to 
establish minimum respiratory protection requirements, such that any 
respirator affording a higher degree of protection than the following 
proposed requirements may be used. This unit includes respirator 
selection requirements for respirators of assigned protection factors 
(APFs) of 1,000 or greater.
     If the measured exposure concentration is at or below 
0.0011 ppm (1.1 ppb): no respiratory protection is required.
     If the measured exposure concentration is above 0.0011 ppm 
(1.1 ppb) and less than or equal to 0.0055 ppm (5.5 ppb) (5 times 
ECEL): Any NIOSH-certified air-purifying quarter mask respirator (APF 
5).
     If the measured exposure concentration is above 0. 0055 
ppm (5.5 ppb) and less than or equal to 0.011 ppm (11.0 ppb) (10 times 
ECEL): Any NIOSH-certified air-purifying half mask or full facepiece 
respirator equipped with NIOSH-approved organic vapor cartridges or 
canisters; or any negative pressure (demand mode) supplied air 
respirator equipped with a half mask (APF 10).
     If the measured exposure concentration is above 0.0011 ppm 
(1.1 ppb) and less than or equal to 0.0275 ppm (27.5 ppb) (25 times 
ECEL): Any NIOSH-certified air-purifying full facepiece respirator 
equipped with NIOSH-approved organic vapor cartridges or canisters; any 
NIOSH-certified powered air-purifying respirator equipped with NIOSH-
approved organic vapor cartridges; or any NIOSH-certified continuous 
flow supplied air respirator equipped with a hood or helmet (APF 25).
     If the measured exposure concentration is above 0.0275 ppm 
(27.5 ppb and less than or equal to 0.055 ppm (55.0 ppb) (50 times 
ECEL): Any NIOSH-certified air-purifying full facepiece respirator 
equipped with NIOSH-approved organic vapor cartridges or canisters; any 
NIOSH-certified powered air-purifying respirator equipped with a tight-
fitting half facepiece and NIOSH-approved organic vapor cartridges or 
canisters; any NIOSH-certified negative pressure (demand mode) 
supplied-air respirator equipped with a full facepiece; any NIOSH-
certified continuous flow supplied-air respirator equipped with a 
tight-fitting half facepiece; any NIOSH-certified pressure-demand or 
other positive pressure mode supplied-air respirator equipped with a 
tight-fitting half facepiece; or any NIOSH-certified negative pressure 
(demand mode) self-contained breathing apparatus respirator equipped 
with a full facepiece (APF 50).
     If the measured exposure concentration is above 0.055 ppm 
(55.0 ppb) and less than or equal to 1.1 ppm (1,100 ppb) (1,000 times 
ECEL): Any NIOSH-certified powered air-purifying respirator equipped 
with a full facepiece and NIOSH-approved organic vapor cartridges or 
canisters; or any NIOSH-certified supplied air respirator equipped with 
a full facepiece and operated in a continuous flow mode or pressure 
demand or other positive pressure mode (APF 1,000).
     If the measured exposure concentration is greater than 1.1 
ppm (1,100 ppb) (1,000 times ECEL) or the concentration is unknown: Any 
NIOSH-certified self-contained breathing apparatus (SCBA) equipped with 
a full facepiece and operated in a pressure demand or other positive 
pressure mode; or any NIOSH-certified supplied air respirator equipped 
with a full facepiece and operated in a pressure demand or other 
positive pressure mode in combination with an auxiliary SCBA operated 
in a pressure demand or other positive pressure mode (APF 10,000).
    EPA proposes to require that owners and operators document 
respiratory protection used and PPE program implementation. EPA 
proposes to require that owners and operators document in the exposure 
control plan or other documentation of the facility's safety and health 
program information relevant to respiratory program, including records 
on the name, workplace address, work shift, job classification, work 
area, and type of respirator worn (if any) by each potentially exposed 
person, maintenance, and fit-testing, as described in 29 CFR 
1910.134(f), and training in accordance with 29 CFR 1910.132(f) and 29 
CFR 1910.134(k).
ii. Dermal Protection
    EPA is proposing to require use and provision of chemically 
resistant gloves by potentially exposed persons in combination with 
specific activity training (e.g., glove selection (type, material), 
expected duration of glove effectiveness, actions to take when glove 
integrity is compromised, storage requirements, procedure for glove 
removal and disposal, chemical hazards) for tasks where dermal exposure 
can be expected to occur. EPA is proposing that owners and operators 
must also consider other glove factors, such as compatibility of 
multiple chemicals used simultaneously while wearing TCE-resistant 
gloves or with glove liners, permeation, degree of dexterity required 
to perform a task, and temperature, as identified in the Hand 
Protection section of OSHA's Personal Protection Equipment Guidance 
(Ref. 47), when selecting appropriate PPE. Furthermore, owners and 
operators can select gloves that have been tested in accordance with 
the American Society for Testing Material (ASTM) F739 ``Standard Test 
Method for Permeation of Liquids and Gases through Protective Clothing 
Materials under Conditions of Continuous Contact.'' EPA requests 
comment on the degree to which additional guidance related to use of 
gloves might be necessary. Additionally, EPA requests comment on 
whether EPA should incorporate additional dermal protection 
requirements into the exposure control plan or require consideration of 
the hierarchy of controls for dermal exposures.
d. General WCPP Requirements
i. Exposure Control Plan
    EPA proposes to require that owners and operators document their 
exposure control strategy and implementation in

[[Page 74743]]

an exposure control plan or through adding EPA-required information to 
any existing documentation of the facility's safety and health program 
developed as part of meeting OSHA requirements or other safety and 
health standards. EPA proposes to require that each owner or operator 
document in the exposure control plan the following:
    (A) Identification and rationale of exposure controls used or not 
used in the following sequence: elimination of TCE, substitution of 
TCE, engineering controls, and administrative controls to reduce 
exposures in the workplace to either at or below the ECEL or to the 
lowest level achievable for TCE in the workplace;
    (B) The exposure controls selected based on feasibility, 
effectiveness, and other relevant considerations;
    (C) If exposure controls were not selected, document the efforts 
identifying why these are not feasible, not effective, or otherwise not 
implemented;
    (D) Actions taken to implement exposure controls selected, 
including proper installation, maintenance, training or other steps 
taken;
    (E) Description of any regulated area and how it is demarcated, and 
identification of authorized persons; and description of when the owner 
or operator expects exposures may be likely to exceed the ECEL or 
lowest achievable exposure level;
    (F) Identification of the lowest achievable exposure level and why 
further reductions are not possible;
    (G) Regular inspections, evaluations, and updating of the exposure 
controls to ensure effectiveness and confirmation that all persons are 
implementing them as required;
    (H) Occurrence and duration of any start-up, shutdown, or 
malfunction of the facility that causes air concentrations to be above 
the ECEL or lowest achievable exposure level and subsequent corrective 
actions taken during start-up, shutdown, or malfunctions to mitigate 
exposures to TCE; and
    (I) Availability of the exposure control plan and associated 
records for potentially exposed persons.
ii. Workplace Information and Training
    EPA is also proposing to require implementation of a training 
program in alignment with the OSHA Hazard Communication Standard (29 
CFR 1910.1200) and the OSHA General Industry Standard for Methylene 
Chloride (29 CFR 1910.1052). To ensure that potentially exposed persons 
in the workplace are informed of the hazards associated with TCE 
exposure, EPA is proposing to require that owners or operators of 
workplaces subject to the WCPP institute a training and information 
program for potentially exposed persons and assure their participation 
in the training and information program.
    As part of the training and information program, the owner or 
operator would be required to provide information and comprehensive 
training in an understandable manner (i.e., plain language) and in 
multiple language as appropriate (e.g., based on languages spoken by 
potentially exposed persons) to potentially exposed persons prior to or 
at the time of initial assignment to a job involving potential exposure 
to TCE. In alignment with the OSHA Hazard Communication Standard, 
owners and operators would be required to provide information and 
training to all potentially exposed persons that includes (A) the 
requirements of the TCE WCPP and how to access or obtain a copy of the 
requirements of the WCPP; (B) the quantity, location, manner of use, 
release, and storage of TCE and the specific operations in the 
workplace that could result in TCE exposure; (C) principles of safe use 
and handling of TCE in the workplace, including specific measures the 
owner or operator has implemented to reduce inhalation exposures or 
prevent dermal contact with TCE, such as work practices and PPE used; 
(D) the methods and observations that may be used to detect the 
presence or release of TCE in the workplace (such as monitoring 
conducted by the owner or operator, continuous monitoring devices, 
visual appearance or odor of TCE when being released, etc.); and (E) 
the health hazards associated with exposure to TCE.
    In addition to providing training at the time of initial assignment 
to a job involving potential exposure to TCE, and in alignment with the 
OSHA General Industry Standard for Beryllium (20 CFR 1910.1024), owners 
and operators subject to the TCE WCPP would be required to re-train 
each potentially exposed person annually to ensure they understand the 
principles of safe use and handling of TCE in the workplace. Owners and 
operators would also need to update the training as necessary whenever 
there are changes in the workplace, such as new tasks or modifications 
of tasks, in particular, whenever there are changes in the workplace 
that increase exposure to TCE or where potentially exposed persons' 
exposure to TCE can reasonably be expected to exceed the action level. 
To support compliance, EPA is proposing that each owner or operator of 
a workplace subject to the WCPP would be required to provide to the 
EPA, upon request, all available materials related to workplace 
information and training.
iii. Workplace Participation
    EPA encourages owners or operators to consult with persons that 
have potential for exposure on the development and implementation of 
exposure control plans and PPE/respirator programs. EPA is proposing to 
require owners or operators to provide potentially exposed persons or 
their designated representatives regular access to the exposure control 
plans, exposure monitoring records, and PPE program implementation and 
documentation. To ensure compliance in workplace participation, EPA is 
proposing that the owner or operator document the notice to and ability 
of any potentially exposed person that may reasonably be affected by 
TCE inhalation exposure or dermal contact with TCE to readily access 
the exposure control plans, facility exposure monitoring records, PPE 
program implementation, or any other information relevant to TCE 
inhalation or dermal exposure in the workplace. EPA is requesting 
comment on how owners and operators can engage with potentially exposed 
persons on the development and implementation of an exposure control 
plan and PPE program.
iv. Recordkeeping
    To support and demonstrate compliance, EPA is proposing that each 
owner or operator of a workplace subject to WCPP retain compliance 
records for five years. EPA is proposing to require records to include:
    (A) the exposure control plan;
    (B) PPE program implementation and documentation, including as 
necessary, respiratory protection and dermal protection used and 
related PPE training; and
    (C) information and training provided to each person prior to or at 
the time of initial assignment and any re-training.
    In addition, EPA is proposing that owners and operators subject to 
the WCPP requirements maintain records to include:
    (D) The exposure monitoring records;
    (E) Notification of exposure monitoring results; and
    (F) To the extent that the owner or operator relies on prior 
exposure monitoring data, records that demonstrates that it meets all 
of the proposed WCPP requirements.
    The owners and operators, upon request by EPA, would be required to 
make all records that are maintained as

[[Page 74744]]

described in this unit available to EPA for examination and copying in 
accordance with EPA requirements. All records required to be maintained 
by this unit could be kept in the most administratively convenient form 
(electronic or paper).
v. Compliance Timeframes
    EPA is proposing to require each owner or operator of a workplace 
subject to an ECEL conduct initial baseline monitoring according to the 
process outlined in this unit by 6 months after date of publication of 
the final rule in the Federal Register. EPA is proposing to require 
each owner or operator ensure that the airborne concentration of TCE 
does not exceed the ECEL or lowest achievable exposure level for all 
potentially exposed persons within 9 months after the date of 
publication of the final rule in the Federal Register, and if 
applicable, each owner or operator must provide respiratory protection 
sufficient to reduce inhalation exposures to below the ECEL to all 
potentially exposed persons in the regulated area within 3 months after 
receipt of the results of any exposure monitoring that indicates 
exposures exceeding the ECEL or, if using monitoring data conducted 
within five years prior to the effective date of the final rule that 
satisfies all other requirements of the proposed WCPP, within 9 months 
after the date of publication of the final rule in the Federal 
Register. EPA is also proposing to require owners and operators 
demarcate a regulated area within 3 months after receipt of any 
exposure monitoring that indicates exposures exceeding the ECEL. 
Regulated entities should then proceed accordingly to implement an 
exposure control plan within 12 months after date of publication of the 
final rule in the Federal Register. EPA requests comment relative to 
the ability of owners or operators to conduct initial monitoring within 
6 months after date of publication of the final rule in the Federal 
Register, and anticipated timeframes for any procedural adjustments 
(i.e., use of new technologies for personal breathing zone monitoring 
at extremely low-ppm levels of TCE) needed to comply with the 
requirements outlined in this unit, including establishment of a 
respiratory protection program and development of an exposure control 
plan.
    EPA understands that the regulated community may have difficulty 
measuring at or below the ECEL consistently over an entire work shift. 
Therefore, EPA is requesting comment regarding the amount of time, if 
any, it would take the regulated community to develop a method to 
measure at or below the ECEL over an entire work shift. EPA is 
interested in what levels of detection are possible based on existing 
monitoring methods, justification for the timeframe of the specific 
steps needed to develop a more sensitive monitoring method, and any 
additional detailed information related to establishing a monitoring 
program to reliably measure TCE at or below the ECEL.
    With regard to the compliance timeframe for those occupational 
conditions of use which are subject to dermal protection requirements, 
EPA is proposing to require each owner or operator of a workplace 
subject to dermal protection requirements to establish dermal 
protection outlined in this unit by 6 months after publication of the 
final rule in the Federal Register. EPA requests comment relative to 
the ability of owners or operators to implement dermal protection 
within 6 months of publication of the final rule in the Federal 
Register, and anticipated timeframes for any procedural adjustments 
needed to comply with the requirements outlined in this unit. EPA may 
finalize shorter or longer compliance timeframes based on consideration 
of public comments.
3. TSCA Section 6(g) Exemptions
    Under TSCA section 6(g)(1), EPA may grant an exemption from a 
requirement of a TSCA section 6(a) rule for a specific condition of use 
of a chemical substance or mixture if the Agency makes one of three 
findings. TSCA section 6(g)(1)(A) permits such an exemption if the 
specific condition of use is a critical or essential use for which no 
technically and economically feasible safer alternative is available. 
Under TSCA section 6(g)(1)(B), EPA must find that compliance with the 
requirement would significantly disrupt the national economy, national 
security, or critical infrastructure to provide an exemption. Finally, 
TSCA section 6(g)(1)(C) allows for an exemption based on an EPA finding 
that the specific condition of use of the chemical substance or 
mixture, as compared to reasonably available alternatives, provides a 
substantial benefit to health, the environment, or public safety. Based 
on discussions and information provided by industry stakeholders and 
consultation with DOD and NASA, EPA has analyzed the need for several 
different exemptions and is proposing to grant six. This unit presents 
the results of that analysis.
    Pursuant to TSCA section 6(g)(3), if an exemption is finalized, EPA 
may by rule later extend, modify, or eliminate the exemption, on the 
basis of reasonably available information and after adequate public 
justification, if EPA determines the exemption warrants a change. EPA 
will initiate this rulemaking process at the request of any regulated 
entity benefiting from such an exemption. The Agency is open to 
engagement throughout the duration of any TSCA section 6(g) exemption 
and emphasizes that, to ensure continuity in the event of an extension 
or modification, such a request should come at least two years prior to 
the expiration of an exemption.
a. Analysis of the Need for TSCA Section 6(g)(1) Exemptions for Uses of 
TCE That Are Critical or Essential
i. Analysis of the Need for a TSCA Section 6(G)(1)(B) Exemption for 
Industrial and Commercial Use of TCE as a Processing Aid for Battery 
Separator Manufacturing (Lead-Acid And Lithium Battery Separators)
    As part of industry stakeholder engagement and interagency 
consultation with other Federal agencies following publication of the 
2020 Risk Evaluation for TCE (Ref. 35 stakeholder meeting list), EPA 
was made aware that some U.S. battery separator manufacturers continue 
to rely on TCE to manufacture specialty separator materials of lead-
acid and lithium batteries (Refs. 48, 49). In the 2020 Risk Evaluation 
for TCE, EPA evaluated the industrial and commercial use of TCE as a 
processing aid for battery separator manufacturing. EPA understands 
that the manufacture of battery separators takes place separately from 
overall battery manufacture, that both lead-acid and lithium batteries 
require separators for operation, and that the lead-acid and lithium 
battery separator manufacturing processes are highly engineered 
specialty products manufactured with precision to stringent technical 
specifications essential to power vehicles and systems in the U.S. 
supply chain for multiple critical infrastructure sectors within the 
national economy.
    EPA understands that separators are fundamental components in 
batteries that provide the necessary separation between the internal 
anode and cathode components that make batteries work, and that a 
restriction on TCE use for the production of battery separators would 
critically impact the U.S. battery manufacturing supply chain and 
impede the expansion of domestic battery production capacity (Refs. 50, 
51). Industry stakeholders as well as other Federal agencies have 
discussed with EPA the potential adverse implications of banning or 
severely restricting use of TCE for battery separator production, as it 
would

[[Page 74745]]

disrupt the supply chain and leave the U.S. reliant on foreign 
suppliers to the extent that they are available to support the national 
economy, national security, and critical infrastructure (Refs. 48, 49). 
EPA agrees these assertions have merit. Lead-acid and lithium batteries 
are essential to serve critical infrastructure such as transportation 
systems, security systems, as well as to energize the national defense 
base (e.g., nuclear submarine batteries). Two companies requested that 
EPA provide exemptions under TSCA section 6(g) to allow for the 
continued use of TCE in the manufacture of battery separators, noting 
their significant concern about potential prohibitions under TSCA on 
the use of TCE. Both companies emphasized the need for the continued 
use of TCE in the manufacture of battery separators to strengthen 
critical supply chains by revitalizing domestic manufacturing and 
research and development in accordance with Executive Order 14017 (86 
FR 11849, March 1, 2021). Additionally, the companies noted that a 
potential ban on TCE would be contrary to the Administration's national 
security priorities, which are to reduce supply chain risks by building 
a robust domestic renewable power sector, transitioning to a clean 
energy-based economy, growing a mature and competitive high-capacity 
battery industry, and leading global innovation and production in 
advanced technology products through a strong domestic manufacturing 
base.
    One company requested a TSCA section 6(g) exemption for the use of 
TCE and described the specific use of TCE as an ``extraction solvent'' 
during the separator manufacturing process for both lead-acid and 
lithium battery separators (Ref. 48). The company makes lead-acid and 
lithium battery separators from naphthenic process oil during the 
extrusion process in order to form a thin sheet or film for each 
separator. During the extrusion process, a precise amount of process 
oil must be removed from the separator, which requires the use of a 
solvent (i.e., TCE) to rapidly extract the process oil and leave behind 
the desired porosity to allow ion flow in each finished battery. The 
finished separators must contain a specific percentage of residual 
process oil that ranges between 15% to 20% for lead-acid battery 
separators (for oxidation resistance in the finished battery) and less 
than 1% for lithium separators. Once the solvent has removed the 
precise amount of oil from each separator, the solvent must be 
evaporated/removed from the separator, and post-evaporation, the 
separator must have the specific porosity and wettability to provide 
low electrical (ionic) resistance (i.e., enabling ion transport) within 
a battery. For these established separator manufacturing processes, TCE 
is a high-performance process solvent that provides a unique 
combination of chemical properties (e.g., non-flammability, rapid 
extrusion of process oil, compatibility with process equipment, etc.), 
which facilitate the controlled removal of process oil in both lead-
acid and lithium separator production processes. The company also 
detailed that there is no other chemical alternative that is suitable 
or available to replace TCE in its lead-acid or lithium separator 
processes.
    A second company requested a TSCA section 6(g) exemption for the 
use of TCE as a necessary solvent for the manufacture of lead-acid 
battery separators and indicated that prohibiting the use of TCE would 
harm the U.S. manufacturing, energy, transportation, and defense 
sectors (Ref. 49). The company describes its use of TCE as specific to 
the manufacture of polyethylene plate separators used by others in 
commercial wet cell batteries. Their lead-acid battery separators are 
made of silica, process oil, and PE resin, a unique polymer that is 
extruded into a sheet form using the process oil. After the sheet is 
formed, an oil-extraction process employs TCE to extract the process 
oil, which reduces the oil content within the sheet to 20-25%, and, 
once the solvent has removed the precise amount of oil from the lead-
acid separator, the solvent is evaporated/removed from the separator to 
yield the required porosity to allow ion flow in the finished battery. 
Finally, the extracted oil and 99.7% of TCE are captured and reused in 
the extraction process. The company notes that its lead-acid battery 
separators are essential in gasoline and electric-powered commercial 
vehicles, emergency response and military vehicles, marine engines, 
nuclear power providers, as well as other business sectors. The company 
further reiterates the unique chemical properties that are essential to 
facilitate the controlled removal of process oil while allowing the 
company to recover and recycle previously-used TCE efficiently for 
reuse in the battery separator production process in a manner that they 
describe as minimizing worker exposure, while resulting in a product 
with the characteristics required by battery producers. The company has 
provided details to EPA on its sophisticated engineering process that 
follows the hierarchy of controls to minimize worker exposure. This 
includes a separate enclosed structure under negative pressure as a 
work area for TCE processing; limiting the time personnel are allowed 
to enter spaces where they could be potentially exposed to 15 minutes 
at a time; work area ventilation and filtration using carbon beds; and 
PPE including either a half-face or full-face air purifying respirator 
for any entry into the work area, as well as chemical-resistant gloves, 
chemical-resistant aprons, goggles, and face shields (Ref. 49, 53).
    Both companies that requested a time-limited exemption for use of 
TCE for battery separator production in the U.S. have demonstrated to 
EPA the facility-specific research, development, and implementation of 
sophisticated control measures to minimize TCE exposures, while also 
searching for reasonably available alternative solvents and processes 
(Refs. 48, 49).
    According to the requesters, there are several properties that make 
TCE uniquely suitable for use in the manufacture of battery separators. 
First, TCE is non-flammable. According to one requester, the only other 
solvent that is currently in use in this application is hexane, which 
is explosive and highly flammable, presenting a safety risk. Other key 
properties described by the requesters include TCE's rapid extraction 
of process oil, its compatibility with the metallurgy of the process 
equipment, the ease by which TCE is distilled from the process oil for 
recovery and reuse, and its vapor pressure that both allows for 
evaporation and permits condensation from the atmosphere using cooling 
coils. One requester evaluated more than a dozen potential 
alternatives, including hexane, other chlorinated solvents such as 
methylene chloride and perchloroethylene, 1-bromopropane, acetone, 
alcohols, siloxanes, and water. Some were eliminated as not being 
compatible with the process, such as water, which is not miscible with 
the process oil, so it cannot be used to extract the oil. Others were 
found to be much less effective than TCE at extracting process oils, 
while some were not as easy to recover and reuse. Even the more 
promising solvents, such as perchloroethylene, were not drop-in 
replacements and would, according to the requester, require expensive 
equipment modifications and a multi-year customer approval process. 
Based on requester submissions and EPA's general understanding of the 
battery separator manufacturing process, EPA believes that there are no 
feasible

[[Page 74746]]

alternatives to TCE available at present (Refs. 48, 49, 52).
    One company requested a fixed exemption period of 25 years due to 
the critical nature of TCE use, current lack of any safer 
technologically or economically feasible alternative, and to avoid 
grave disruption to the U.S. economy, critical infrastructure, and 
defense base (Ref. 54). The company further explained that a 
restriction on TCE without sufficient time to identify, develop, and 
test a technically and economically feasible alternative (should such 
an alternative be identified and become available) would pose 
significant cost and safety concerns for the automobile and other 
critical infrastructure industries. The requester further explained 
that battery manufacturer customers and end users require compliance 
with strict performance testing, and, in addition, if a technically 
feasible alternative does become available, it will take multiple years 
to retrofit and obtain approvals required for the technical, economic 
and commercial feasibility of the separators. The company offered to 
provide EPA periodic reports every five years on its efforts to 
identify and assess feasible alternatives; in this way, EPA would 
receive ongoing alternatives analyses to ensure forward progress, while 
the company would obtain the regulatory certainty needed to maintain 
sustainable production for its customers (Ref. 48).
    Similarly, the second company requested a 25-year exemption from 
restrictions on this use of TCE, with an additional request that EPA 
consider future extensions for additional time, in order to allow its 
use of TCE until a safer, feasible alternative is available (Ref. 49). 
The company justified the lengthy exemption request by explaining its 
ongoing search for alternatives since 2014, and its estimates that, 
while it will be another five years before a suitable alternative is 
identified, the period for trial use, customer vetting and approval and 
construction of a new manufacturing plant is expected to last at least 
20 years. In addition, the second requester also offered to submit to 
EPA periodic reports every five years to detail their efforts to 
identify and assess feasible alternatives.
    Based on the information provided to EPA, EPA proposes that 
compliance at this time with a prohibition for this specific condition 
of use would significantly disrupt national security and critical 
infrastructure. EPA agrees that the use of lead-acid batteries and 
lithium battery separators is crucial to each of these sectors at this 
time. These batteries are essential for critical infrastructure such as 
transportation and security systems, as well as for energizing the 
national defense base (e.g., nuclear submarine batteries). Furthermore, 
EPA agrees that compliance with the prohibition would disrupt national 
security priorities of reducing supply chain risks by building a robust 
domestic renewable power sector and transitioning to a clean energy-
based economy.
    Despite the request for a 25-year exemption from two separate 
companies, EPA is proposing a 10-year time-limited TSCA section 6(g) 
exemption. EPA believes that a 10-year exemption from the prohibition 
on TCE as a processing aid, specific to lead-acid and lithium battery 
separator manufacturing, is reasonable because it would be sufficient 
to provide EPA with an updated analysis of any technically feasible 
alternative, the supply chain of the U.S. battery industry, as well as 
global innovation and production in high-technology products. Under 
TSCA section 6(g), EPA can consider revisiting or extending time-
limited exemptions by rulemaking until a safer, feasible alternative 
becomes available, provided EPA receives an updated analysis of the 
specific use. EPA considered the emphasis in TSCA section 6(d) that 
compliance dates be as soon as practicable, and that TSCA section 6(g) 
requires that any exemptions be well-justified. EPA also took into 
consideration the regulatory scheme under the European Chemicals Agency 
for this use of TCE for battery separator manufacturing, and the 
periodic reporting cycle established in the European Union and United 
Kingdom. In the EU and UK, authorizations are chemical- and facility-
specific and for a duration of either 7 or 12 years. Under the current 
EU and UK authorizations, in which a panel reviewed the scientific and 
economic implications of the specific TCE use, each battery separator 
manufacturing company was approved for a 7-year authorization period 
(with a 2023 expiration date); both companies have applied for a 
renewal for an additional 12 years after 2023 (Ref. 55). Noting that 
this industry has been able to provide updated applications for 
authorization to the EU and UK in a renewal cycle that has been shorter 
than 10 years, the two companies' interest in providing periodic 
updates to EPA, and the fast pace of battery technology development, 
EPA proposes that 10 years is sufficient for this time-limited 
exemption, and that this timeframe would also align with the EU and UK 
approaches. EPA requests comment on whether 10 years is an appropriate 
timeframe for the proposed TSCA section 6(g) exemption for industrial 
and commercial use of TCE as a processing aid for battery separator 
manufacturing (lead-acid and lithium battery separators).
ii. Analysis of the Need for a TSCA Section 6(g)(1)(B) Exemption for 
TCE Use for DoD Naval Vessels
    During the analysis for this rulemaking of the use of TCE, EPA has 
identified that it is necessary to allow for the continued use of TCE 
for industrial uses for DoD naval vessel requirements for potting, 
bonding and sealing compounds, bonding and cleaning requirements for 
naval combat systems, radars, sensors, equipment, and fabrication and 
prototyping processes.
    These naval vessel-related COUs cover the platform itself and/or 
specific systems, equipment, or processes. The use of TCE for 
industrial uses on DoD naval vessels is critical and essential, and a 
prohibition for this specific condition of use would significantly 
disrupt national security and critical infrastructure. An exemption for 
DoD uses for naval vessels would enable the continued use of TCE for 
the COUs described which relate to vessels and their systems, and which 
enable maintenance, fabrication and sustainment and thus the operation 
of naval vessels and equipment.
    DoD has been unable to identify suitable alternatives for TCE for 
these uses. Based on information received from DoD, a 10-year timeframe 
for this exemption would prevent disruption of national security and 
allow critical infrastructure priorities to be met.
iii. Analysis of the Need for TSCA Section 6(g)(1)(A) Exemption of TCE 
for Laboratory Use That for Essential Laboratory Activities
    During the analysis for this rulemaking of the uses of TCE, EPA 
agrees that it is necessary to allow the continued use of TCE for 
laboratory use for essential laboratory activities (this use is within 
the condition of use ``Industrial and commercial use of TCE in hoof 
polish; gun scrubber; pepper spray; and other miscellaneous industrial 
and commercial uses,'' described in Unit III.B.1.c.xx.). Under 
essential laboratory activities, EPA includes chemical analysis, 
chemical synthesis, extracting and purifying other chemicals, or 
dissolving other substances. Additionally, EPA includes as an essential 
laboratory activity research and development for new technologies 
related to monitoring and remediation for cleanup activities

[[Page 74747]]

related to TCE contamination and for new analytical methods for 
exposure monitoring (e.g., for the ECEL).
    Under TSCA section 6(g)(1)(A), EPA determined that TCE use as a 
laboratory chemical for essential laboratory activities is a critical 
and essential use with no technically and economically available 
substitutes. The use of TCE in laboratory use for essential laboratory 
activities is critical for ongoing Federal, state, and local government 
cleanup projects, in which it is necessary to use TCE as a laboratory 
chemical for the analysis of TCE-contaminated soil, air, and water 
samples. In these projects which are specific to TCE, the continued use 
of TCE in laboratory settings for chemical analysis when applied to 
cleanup and exposure monitoring is critical to efforts to improve 
health, the environment, and public safety and is without a technically 
available substitute. Additionally, industrial laboratory analysis is 
essential in monitoring for the presence of TCE for the adequate 
reduction of overall exposure to TCE in alignment with the hierarchy of 
controls. In order to accurately conduct exposure monitoring of TCE to 
implement the WCPP for the uses with longer timeframes, industrial and 
commercial use of TCE as a laboratory chemical to provide for the 
chemical analysis of samples is critical and essential and without a 
technical alternative. A 50-year timeframe for the continued use of TCE 
for uses in a laboratory for chemical analysis would allow a sufficient 
time for TCE remediation to occur at most identified clean-up sites, as 
well as sites not yet identified. EPA also proposes to include in this 
exemption the use by NASA of TCE in essential laboratory activities as 
a laboratory reagent, calibration standard, and for dissolving other 
substances (Ref. 56). Following interagency consultation with NASA, EPA 
understands NASA's critical use of TCE in laboratories to include 
sample preparation and equipment calibration related to the search for 
chlorinated hydrocarbons on Mars, calibration of gas mixture used in 
identification of contaminants in breathing air in human-rated space 
and aerospace systems, and preparation of quality assurance samples for 
groundwater analysis. EPA is also aware of an additional critical use 
of TCE in laboratories by NASA to dissolve substances, such as for wax 
removal from infrared sensors. The wax is applied to protect the 
sensors during the development of infrared detectors incorporated into 
specialty instruments. TCE is used to remove the wax, and, unlike other 
solvents, has not been found to damage other delicate components of the 
infrared sensors.
    As an example of this use, EPA notes that the devices that require 
this kind of wax removal are built in the Detector Development Lab, 
which is an International Standards Organization 5 cleanroom dedicated 
to fabrication of detectors (including infra-red). The lab utilizes 
semiconductor like processes to create these devices in silicon wafers 
or similar substrates, through build up or removal of layers toward 
meeting NASA missions. Detectors and devices are built in the lab that 
are not typically found in industry yet are needed to meet NASA 
requirements. The devices built tend to be unique, one-of-a-kind 
devices created using equally unique and highly specialized processes. 
One of these processes uses TCE. Part of device fabrication requires 
building up or removing material from both sides of the wafer. To do 
so, while protecting one side, a sacrificial substrate is commonly 
adhered to the silicon substrate using a wax material as glue. In many 
cases, when the process is complete, the wax is dissolved away to 
remove the sacrificial substrate. Common waxes that achieve this 
process are readily dissolved in a polar solvent such as acetone. The 
build-up or removal of material is done in a manner to create very 
specific patterns with each layer. These patterns are transferred to 
the substrate using a polymer material called photoresist. Once the 
pattern transfer is complete the photoresist is removed using acetone 
or other means.
    In the case of creating certain types of infra-red detectors, there 
is a need to embed a photoresist pattern within the wax layer when 
gluing a sacrificial substrate to the silicon wafer. The requirement is 
that the patterned resist remain intact after dissolving the wax. Using 
solvents such as acetone would simultaneously dissolve the resist 
pattern or in the case of some solvents deform or weaken the 
photoresist beyond rendering it unusable. TCE is the only product 
identified that can perform this process. Specifically, TCE is able to 
dissolve the wax layer and leave the patterned resist layer 
uncompromised. The use of TCE is solely for dissolving material and is 
always used in an exhausted hood in the laboratory. Each hood is 
inspected yearly by an on-site Industrial Hygiene Office to ensure 
proper airflow and operation. The hood has a local alarm for airflow 
that is tested daily for operation. The clean room has vertical laminar 
air flow, pushing air into the exhausted hoods as air is pulled by the 
exhaust fans. The room is maintained at a positive pressure of 0.08 
inches on water column. For added exposure reduction, the laboratory is 
equipped with a separate emergency exhaust fan which, if activated, 
creates a negative pressure in the laboratory. All potentially exposed 
persons are provided a full set of PPE that includes apron with arm 
guards, face shield, safety glasses, standard issue nitrile gloves and 
chemical gloves rated for chlorinated solvents.
    The process consists of the following steps: First, the wafer is 
soaked in 200-2000 mL of TCE (volume dependent on wafer size). When the 
wax is fully dissolved, the wafer is transferred to a second (fresh) 
TCE container of 200-2000mL and soaked for several minutes. Then, the 
effluent is rinsed with de-ionized water and the waste TCE is captured 
in waste containers for disposal by an on-site Environmental Group. 
This process is conducted over the span of approximately one week and 
is required an average of 3 times per year. When the process is 
complete all chemicals are disposed of or stored in screw capped 
bottles within an exhausted enclosure. Based on the information 
available to EPA, EPA is including the use of TCE in laboratories by 
NASA to dissolve substances as part of the proposed exemption for use 
of TCE in laboratories for essential laboratory activities. In 
addition, based on the information provided by NASA and other Federal 
agencies, EPA has considered and is including in this proposal an 
exemption for additional research and development activities and test 
and evaluation method activities, and similar laboratory activities, 
conducted by Federal agencies and their contractors, provided the use 
is essential to the agency's mission. As described more fully in Unit 
V.A.3.a.vi., for example, NASA's mission requires that it operate at 
the cutting edge of science, in environments that are hostile to life, 
especially human life. While NASA is skilled at addressing problems 
presented by these environments, EPA is concerned that the proposed 
limits on this laboratory use exemption in general would negatively 
affect NASA's ability to respond to issues that arise in spaceflight, 
particularly human spaceflight. Similarly, EPA believes that the DoD's 
unique mission requires additional flexibilities for research and 
development in order to maintain military readiness at all times.
    It should be noted that the use of TCE in laboratory settings for 
testing asphalt would not be included in this TSCA section 6(g) 
exemption because it is not critical nor essential, and because 
alternative testing methods exist,

[[Page 74748]]

including the Nuclear Asphalt Content Gauge and the Ignition Method 
(Ref. 57). EPA requests comment on whether 50 years is a reasonable 
timeframe for the TSCA section 6(g) exemption for the industrial and 
commercial use of TCE in laboratory use essential for chemical 
analysis. Specifically, EPA requests comment on the anticipated 
duration of TCE cleanup projects, and whether there will be projects 
that continue and require the use of TCE as a laboratory chemical for 
the analysis of contaminated soil, air, and water samples past 50 
years. Additionally, EPA requests comment on if the exemption for 
laboratory use of TCE should include research and development purposes 
for objectives broader than cleanup activities or exposure monitoring, 
such research into TCE alternatives, whether these broader objectives 
should be limited to Federal agencies and their contractors or expanded 
to include others, and whether a shorter time period, such as 10 years, 
should be imposed on these broader research and development activities.
iv. Analysis of the Need for a TSCA Section 6(g)(1)(A) Exemption for 
Disposal of TCE to Industrial Pre-Treatment, Industrial Treatment, or 
Publicly Owned Treatment Works for the Purposes of Cleanup Projects of 
TCE-Contaminated Groundwater and Other Wastewater
    EPA has conducted an analysis of the application of this rulemaking 
and found that the disposal of TCE to industrial pre-treatment, 
industrial treatment, or publicly owned treatment works for the 
purposes of cleanup projects of TCE-contaminated groundwater and other 
wastewater should be permitted to continue for some period of time to 
avoid adverse impacts on these important remediation projects.
    TCE is a contaminant of concern in a significant number of cleanup 
sites that are managed under the Comprehensive Environmental Response, 
Compensation, and Liability Act (CERCLA), also known as Superfund 
sites, as well as under the Resource Conservation and Recovery Act 
(RCRA) and state programs authorized under RCRA. The remediation of 
these sites, including the removal and treatment of TCE-contaminated 
groundwater, is critical to EPA's mission to protect human health and 
the environment. The disposal of wastewater that contains TCE to 
industrial pre-treatment, industrial treatment, or publicly owned 
treatment works is an important method used in these cleanup efforts. 
In EPA's analysis of this rulemaking, EPA determined that at many 
contaminated sites, TCE-contaminated wastewater is pumped out of the 
ground and either sent to offsite industrial treatment or publicly 
owned treatment works. EPA acknowledges that the cleanup of these sites 
is vital work in which the disposal of TCE is a critical or essential 
use for which no technically and economically feasible safer 
alternative is available that must continue under CERCLA, RCRA, 
authorized state programs, and/or orders or permits issued under those 
authorities. Taking into consideration hazards and exposure, a 
prohibition on disposal without this exemption could result in 
prolonged exposure to TCE-contaminated groundwater for affected 
communities. EPA is concerned that eliminating a common disposal method 
for TCE-contaminated groundwater would be a significant burden on these 
cleanups and would likely slow the pace of remediation at the numerous 
sites where TCE-contaminated groundwater is a problem. EPA also 
understands that there are other sites where TCE-contaminated 
groundwater is being addressed under the authority of other federal 
environmental laws or state and local government authorities, including 
at sites that are currently implementing remedies selected through 
relevant statutory and regulatory processes, and the impact of a 
prohibition on an important disposal method is expected to be similar. 
EPA therefore is proposing a 50-year exemption from the prohibition on 
disposal of TCE by industrial pre-treatment, industrial treatment, or 
publicly owned treatment works for cleanup projects undertaken under 
the authority of CERCLA, RCRA, or other federal, state, or local 
government environmental laws, regulations, or requirements.
    A 50-year timeframe for the continued disposal of TCE to industrial 
pre-treatment, industrial treatment, or publicly owned treatment works 
for the purposes of federal, state, and local government cleanup 
projects would allow a sufficient time for TCE remediation to occur at 
most sites. Additionally, the 50-year timeframe aligns with the 
proposed 50-year time-limited TSCA section 6(g)(1)(A) exemption for 
industrial and commercial use of TCE as a laboratory chemical in 
essential laboratory activities, which is also intended to support 
cleanup operations through allowing for the analysis of samples. EPA 
requests comment on whether 50 years is a reasonable timeframe for a 
TSCA section 6(g)(1)(A) exemption for the cleanup of TCE-contaminated 
water and groundwater sites. Specifically, EPA requests comment on the 
anticipated duration of TCE cleanup projects, and whether there will be 
projects that may continue and require the disposal of TCE to 
industrial pre-treatment, industrial treatment, or publicly owned 
treatment works beyond 50 years.
v. Analysis of the Need for a TSCA Section 6(g)(1)(B) Exemption for 
Industrial and Commercial Use of TCE as a Solvent in Closed Loop Vapor 
Degreasing Necessary for Human-Rated Rocket Engine Cleaning by NASA and 
Its Contractors
    EPA has conducted an analysis of the application of this rulemaking 
to the industrial and commercial use of TCE as a solvent in closed-loop 
vapor degreasing necessary for human-rated rocket engine cleaning by 
NASA and its contractors and proposes to find that a TSCA section 6(g) 
exemption is warranted. Under TSCA section 6(g)(1)(B), EPA proposes to 
determine that a prohibition at this time on the manufacture, 
processing, and distribution in commerce of TCE as a solvent for 
closed-loop vapor degreasing for human-rated rocket engine cleaning by 
NASA and its contractors would significantly disrupt national security 
and critical infrastructure.
    The United States Space Priorities Framework notes that space 
systems (e.g., flight components of satellites and space craft) are 
part of the nation's critical infrastructure and that the United States 
has significant national security interests in space (Ref. 58). NASA 
operates on the leading edge of science seeking innovative solutions to 
future problems in environments that offer little to no margin for 
error. Identification and qualification of compatible materials in the 
context of the less forgiving environments in which NASA operates is an 
iterative, collaborative process between original equipment 
manufacturers and NASA, especially in the case of human space flight 
operations (Ref. 59). NASA's mission architecture requirements often 
are developed many years in advance of an actual launch occurring. As 
part of mission planning, space systems are designed, full scale mock-
ups are built, and mission critical hardware is constructed using 
materials qualified for spaceflight. According to NASA, for Artemis 
Program applications, in particular, losing access to a qualified high-
performance substance like TCE in a short period of time has the 
potential to introduce an unacceptable level of

[[Page 74749]]

risk to crew, vehicle, and mission viability (Ref. 43).
    As described by NASA, their use of TCE in closed-loop vapor 
degreasing involves cleaning small diameter parts, such as rocket 
engine nozzle coolant tubes, and removing the fluids used for 
manufacturing. Substitutes for TCE and alternative processes do not 
meet the technical specifications required to clean certain complex 
aerospace parts, namely small diameter parts. Specifically, these small 
diameter parts cannot be cleaned with other solvents due to the 
likelihood of entrapment issues (i.e., a solvent carried out of a 
degreaser that adheres to or is entrapped in the part being removed) 
(Ref. 60). As discussed in Unit V.B.3.a.i., similar concerns have been 
expressed by a manufacturer of commercial jetliners and defense, space, 
and security systems, although the manufacturer states that potential 
alternatives have been identified for nearly all applications. Given 
that the small diameter parts identified by NASA are for human-rated 
space flight, there is a rigorous safety standard that must be met, and 
according to NASA, TCE is the only solvent currently qualified for 
degreasing these specific parts. The engines and devices in which these 
parts are used include Space Shuttle engines or hardware being reused; 
others are designed to leverage proven Space Shuttle technology and 
require use of certain fluids, such as TCE, that have been qualified 
for human space flight.
    EPA notes that this proposed exemption of use of TCE as a solvent 
in closed loop vapor degreasing necessary for human-rated rocket engine 
cleaning by NASA and its contractors differs from the exemption for TCE 
in vapor degreasing for essential aerospace parts and components, 
described in the primary alternative regulatory action. As a principal 
matter, this proposed exemption is limited only to NASA and its 
contractors due to the critical infrastructure and national security 
needs of human-rated spaceflight rocket engines. In contrast, the 
alternative is much broader and covers all aerospace entities, 
including commercial aviation. This proposed exemption also differs 
from the alternative regulatory action in that the exemption is limited 
to use of TCE only in closed-loop vapor degreasing, while the 
alternative regulatory action would provide an exemption under TSCA 
section 6(g) for 7 years before prohibition for all vapor degreasing 
with TCE (e.g., open top, in-line conveyorized, in-line web cleaner, 
and other types of vapor degreasing in addition to closed loop). Vapor 
degreasing as an industry has some of the higher exposures of TCE to 
workers and ONUs and this industry would have to make significant 
changes in order to comply to the extent possible with a WCPP until 
prohibition. However, of the types of vapor degreasing processes, 
closed-loop vapor degreasing has the lowest exposures to TCE for 
workers and ONUs, and as such, facilities with a closed-loop process 
are best situated to comply with an interim WCPP and to the extent 
possible, meet the ECEL until prohibition. Further, EPA believes that 
the facilities involved in this particular application of vapor 
degreasing for human-rated rocket engine cleaning by NASA or their 
contractors already have sophisticated industrial hygiene plans in 
place. EPA notes that a prohibition on vapor degreasing with TCE for 
all uses was proposed in 2017 (Ref. 67). While that proposal was 
withdrawn pending the completion of a risk evaluation for TCE under 
amended TSCA, which evaluated all conditions of use including vapor 
degreasing, EPA expects that since the 2017 proposal, certain 
stakeholders have made significant progress in identifying and adopting 
substitutes for vapor degreasing with TCE in anticipation of potential 
restrictions on TCE under amended TSCA. For instance, EPA is aware that 
many users have transitioned to a substitute for TCE in vapor 
degreasing where possible or are planning for technologically feasible 
adjustments (Refs. 32, 43. 60). EPA requests comment on whether 7 years 
is an appropriate timeframe for the proposed TSCA section 6(g) 
exemption for industrial and commercial use of TCE in closed loop vapor 
degreasing necessary for human-rated rocket engine cleaning by NASA and 
its contractors.
vi. Analysis of the Need for TSCA Section 6(g)(1)(A) Exemption for 
Certain NASA Uses in an Emergency for Which No Technically or 
Economically Feasible Safer Alternative is Available
    EPA considered a TSCA section 6(g) exemption for emergency use of 
TCE in the furtherance of NASA's mission. For certain specific 
conditions of use, EPA proposes that use of TCE by NASA and its 
contractors in an emergency be exempt from the requirements of this 
rule because it is a critical or essential use provided that (1) there 
is an emergency; and (2) NASA selected TCE because there are no 
technically or economically feasible safer alternatives available 
during the emergency.
    NASA operates on the leading edge of science seeking innovative 
solutions to future problems where even small volumes of an otherwise 
prohibited chemical substance could be vital to crew safety and mission 
success. During interagency review, NASA expressed concerns that there 
will likely be circumstances where a specific, EPA-prohibited condition 
of use may be identified by NASA during an emergency as being needed in 
order to avoid or reduce situations of harm or immediate danger to 
human health, or the environment, or avoid imperiling NASA space 
missions. In such cases, it is possible that no technically and 
economically feasible safer alternative would be available that meets 
the stringent technical performance requirements necessary to remedy 
harm or avert danger to human health, the environment, or avoid 
imperiling NASA space missions.
    An emergency is a serious and sudden situation requiring immediate 
action to remedy harm or avert danger to human health, the environment, 
or to avoid imperiling NASA space missions. In NASA's case, there may 
be instances where the emergency use of TCE for specific conditions of 
use is critical or essential to remedying harm or averting danger to 
human health, the environment, or avoiding imperiling NASA space 
missions. Because of the immediate and unpredictable nature of 
emergencies described in this unit and of the less forgiving 
environments NASA operates in that offer little to no margin for error, 
it is likely that, at the time of finalization of this proposal, 
alternatives to emergency TCE use may not be available in a timely 
manner to avoid or reduce harm or immediate danger (Ref. 59). In this 
way, these emergencies for particular conditions of use meet the 
criteria for an exemption under TSCA section 6(g)(1)(A), because the 
emergency use of TCE for listed conditions of use is critical or 
essential and no technically and economically feasible safer 
alternative will be available in a timely manner, taking into 
consideration hazard and exposure.
    In support of the TSCA section 6(g)(1)(A) emergency use exemption, 
NASA submitted detailed criteria which they must use to screen, 
qualify, and implement materials to be used in spacecraft equipment, as 
well as historical case studies that outline the loss of life and loss 
of assets in the discharge of previous missions. In one of several 
examples detailed, the Apollo I command module fire that claimed the 
lives of three American astronauts demonstrated the need for careful 
testing and continuity of materials (Ref. 59). Moreover, due to NASA's 
rigorous safety testing requirements under various environmental 
conditions, technically and economically feasible

[[Page 74750]]

safer alternatives may not be readily available during emergencies and 
may require certain conditions of use of TCE to alleviate the 
emergency.
    In another example, NASA identified a scenario concerning a mission 
to the International Space Station (ISS) whereby, during a launch 
evolution, the countdown was paused immediately prior to launch (T-2 
minutes). NASA engineers identified a clogged filter and supply line as 
the primary issue, which required immediate attention (i.e., line 
flushing and filter cleaning). In this type of emergency scenario, an 
already approved chemical substance rated for space system applications 
is necessary to immediately remedy the situation. Although TCE was not 
used in this particular incident, if it were needed in the future to 
address such an emergency, then the proposed exemption would allow for 
its lawful use--the countdown would resume and the launch would occur. 
Conversely, without an exemption under the specific condition of use 
(e.g., industrial and commercial use in cold cleaning), NASA's use of 
TCE would be otherwise prohibited, which would put NASA in an untenable 
position of having to choose to either violate the law or place the 
mission (and potentially the health and safety of its employees 
involved in the mission) at risk.
    The identification and qualification of compatible materials in the 
context of aviation is iterative and involves expansive collaboration 
between original equipment manufacturers, federal agencies, and 
qualifying institutions. This is equally, if not more so, the case in 
the context of human space flight operations undertaken by NASA (Ref. 
59). NASA's mission architecture requirements often are developed many 
years in advance of an actual launch occurring. As part of mission 
planning, space systems are designed, full scale mock-ups are built, 
and mission critical hardware is constructed using materials qualified 
for spaceflight. Once NASA's mission architecture requirements are 
developed, NASA may need to retain emergency access to TCE because its 
alternatives may not have yet gone through NASA's rigorous 
certification process before their use. Allowing NASA to retain 
emergency use of TCE would reduce the chances that this rule will 
hinder future space missions for which mission architecture 
infrastructure is being developed or is already built. While NASA 
considers alternatives to the chemical substances it currently uses in 
its space system designs, NASA has not yet identified technically and 
economically feasible alternatives to proven chemistries in many 
current applications. While EPA acknowledges that the use of TCE in 
emergency situations may be necessary in the near term, it is also 
EPA's understanding that NASA will continue its work to identify and 
qualify alternatives to TCE. Thus, EPA is proposing an exemption 
duration of 10 years.
b. Proposed TSCA Section 6(g) Exemptions
i. Proposed 10-Year Exemption for Industrial and Commercial Use of TCE 
as a Processing Aid for Battery Separator Manufacturing (Lead-Acid and 
Lithium Battery Separators)
    For the reasons discussed in this unit, EPA is proposing a 10-year 
exemption from the prohibition on the industrial and commercial use of 
TCE as a processing aid, specific to battery separator manufacturing. 
The proposed conditions for the exemption are: (1) The use of TCE would 
be limited to use as a processing aid for battery separator 
manufacturing to supply the essential battery components to continue to 
support the national economy, national security, and critical 
infrastructure; (2) This specific industrial and commercial use of TCE 
as a processing aid would be required to be conducted at industrial 
facilities already using TCE to manufacture the lithium ion or lead 
acid separators; and (3) Owners or operators of facilities where TCE is 
used as a processing aid for battery separator manufacturing and 
entities that manufacture (including import) TCE as a processing aid 
would be required to comply with the WCPP requirements described in 
Unit V.A.2. until the expiration of the exemption and the prohibition 
compliance date.
ii. Proposed 10-Year Exemption for TCE for Industrial Uses for DoD 
Naval Vessel Requirements
    For reasons discussed in this unit, EPA is proposing a 10-year 
exemption from the prohibition on industrial and commercial use of TCE 
for the industrial and commercial use of TCE as potting compounds for 
naval electronic systems and equipment; sealing compounds for high and 
ultra high vacuum systems; bonding compounds for materials testing and 
maintenance of underwater systems and bonding of nonmetallic materials; 
and cleaning requirements (which includes degreasing using wipes, 
sprays, solvents, and vapor degreasing) for: materials and components 
required for military ordinance testing; temporary resin repairs in 
vessel spaces where welding is not authorized; ensuring polyurethane 
adhesion for electronic systems and equipment repair and installation 
of elastomeric materials; various naval combat systems, radars, 
sensors, equipment; fabrication and prototyping processes to remove 
coolant and other residue from machine parts; machined part 
fabrications for naval systems; installation of topside rubber tile 
material aboard vessels; and vapor degreasing required for substrate 
surface preparation prior to electroplating processes. The proposed 
conditions for the exemption are: (1) The use of TCE would be limited 
to use only for DoD naval vessels and their systems, and in the 
maintenance, fabrication, and sustainment for and of such vessels and 
systems; and (2) Owners or operators of facilities where TCE is used 
for DoD naval vessels and entities that manufacture (including import) 
or process TCE for use in DoD naval vessels would be required to comply 
with the WCPP requirements described in Unit V.A.2. until the 
expiration of the exemption and the prohibition compliance date.
iii. Proposed 50-Year Exemption for TCE Laboratory Use for Essential 
Laboratory Activities
    For the reasons discussed in this unit, EPA is proposing a 50-year 
exemption from the prohibition on industrial and commercial use of TCE, 
for other miscellaneous industrial and commercial use of TCE in 
laboratory use for essential laboratory activities, excluding the 
testing of asphalt, as previously discussed. The proposed conditions 
for the exemption are: (1) The use of TCE would be limited to use in an 
industrial or commercial laboratory for essential laboratory 
activities, including chemical analysis, chemical synthesis, extracting 
and purifying other chemicals, dissolving other substances, and 
research and development for the advancement of cleanup activities and 
analytical methods for monitoring related to TCE contamination or 
exposure monitoring, with the exclusion of laboratory testing for 
asphalt; (2) Federal agencies and their contractors would be permitted 
to conduct research and development activities and test and evaluation 
method activities, and similar laboratory activities, provided the use 
is essential to the agency's mission; and (3) Owners or operators of 
facilities where TCE is used in laboratory settings and entities that 
manufacture (including import) or process TCE for use as a laboratory 
chemical would be required to comply with the WCPP requirements 
described in Unit V.A.2. until the expiration of the

[[Page 74751]]

exemption and the prohibition compliance date.
iv. Proposed 50-Year Exemption for Disposal of TCE to Industrial Pre-
Treatment, Industrial Treatment, or Publicly Owned Treatment Works for 
the Purposes of Cleanup Projects of TCE-Contaminated Groundwater and 
Other Wastewater
    For the reasons discussed in this Unit, EPA is proposing a 50-year 
exemption from the prohibition on disposal of TCE to industrial pre-
treatment, industrial treatment, or publicly owned treatment works for 
the purposes of cleanup projects of TCE-contaminated groundwater and 
other wastewater. The proposed conditions for the exemption are: (1) 
The disposal of TCE to industrial pre-treatment, industrial treatment, 
or publicly owned treatment works would only be permitted for the 
purposes of cleanup projects of TCE-contaminated water and groundwater 
at sites undergoing remediation under CERCLA, RCRA, or other Federal, 
state, and local government laws, regulations or requirements; and (2) 
Owners and operators of the locations where workers are handling TCE 
wastewater, and owners and operators of facilities where TCE is 
disposed to industrial pre-treatment, industrial treatment, or publicly 
owned treatment works, would be required to comply with the WCPP 
requirements described in Unit V.A.2. and the recordkeeping 
requirements described in Unit V.A.4. until the expiration of the 
exemption and the prohibition compliance date.
v. Proposed 7-Year Exemption for Industrial and Commercial Use of TCE 
as a Solvent in Closed-Loop Vapor Degreasing Necessary for Human-Rated 
Rocket Engine Cleaning by NASA and Its Contractors
    For the reasons discussed in this unit, EPA is proposing a 7-year 
exemption from the prohibition on the industrial and commercial use of 
TCE as a solvent in closed-loop vapor degreasing necessary for human-
rated rocket engine cleaning by NASA and its contractors, and the 
manufacture (including import), processing, and distribution in 
commerce of TCE for this use. The proposed conditions for the exemption 
are: (1) The use of TCE would be limited to closed-loop vapor 
degreasing necessary for human-rated rocket engine cleaning by NASA and 
its contractors; and (2) Owners or operators of facilities where TCE is 
used in closed-loop vapor degreasing necessary for human-rated rocket 
engine cleaning by NASA and its contractors, and entities that 
manufacture (including import) or process TCE for such use, would be 
required to comply with the WCPP requirements described in Unit V.A.2. 
until the expiration of the exemption and the prohibition compliance 
date.
vi. Proposed Exemption for Uses of TCE for Emergency Uses in the 
Context of Human Space Flight for Certain Uses
    For the reasons discussed in this Unit, EPA is proposing a 10-year 
exemption for emergency use of TCE in furtherance of NASA's mission for 
the following specific conditions of use:
    (1) Industrial and commercial use as solvent for open-top or 
closed-loop batch vapor degreasing;
    (2) Industrial and commercial use as a solvent for cold cleaning;
    (3) Industrial and commercial use as a solvent for aerosol spray 
degreaser/cleaner and mold release;
    (4) Industrial and commercial use as a lubricant and grease in tap 
and die fluid;
    (5) Industrial and commercial use as a lubricant and grease in 
penetrating lubricant;
    (6) Industrial and commercial use as an adhesive and sealant in 
solvent-based adhesives and sealants;
    (7) Industrial and commercial as a functional fluid in heat 
exchange fluid;
    (8) Industrial and commercial use in corrosion inhibitors and anti-
scaling agents; and
    (9) Industrial and commercial use of TCE as a processing aid.
    EPA is also proposing to include additional requirements as part of 
the exemption, pursuant to TSCA section 6(g)(4), including required 
notification and controls for exposure, to the extent feasible: (1) 
NASA and its contractors must provide notice to the EPA Administrator 
of each instance of emergency use within 15 days; and (2) NASA and its 
contractors would have to comply with the ECEL.
    EPA is proposing to require that NASA notify EPA within 15 days of 
the emergency use. The notification would include a description of the 
specific use of TCE in the context of one of the conditions of use for 
which this exemption is being proposed, an explanation of why the use 
described qualifies as an emergency, and an explanation with regard to 
the lack of availability of technically and economically feasible 
alternatives.
    EPA expects NASA and its contractors have the ability to implement 
a WCPP as described in Unit V.A.2. for the identified uses in the 
context of an emergency, to some extent even if not to the full extent 
of WCPP implementation. Therefore, EPA is proposing to require that 
during emergency use, NASA must comply with the ECEL to the extent 
technically feasible in light of the particular emergency.
    Under the proposed exemption, NASA and its contractors would still 
be subject to the proposed general recordkeeping requirements discussed 
in Unit V.A.
    EPA requests comment on this TSCA section 6(g) exemption for 
continued emergency use of TCE in the furtherance of NASA's mission as 
described in this Unit, and whether any additional conditions of use 
should be included, in particular for any uses qualified for space 
flight for which no technically or economically feasible safer 
alternative is available. Additionally, EPA requests comment on what 
would constitute sufficient justification of an emergency.
4. Other Requirements
a. Recordkeeping
    In addition to the recordkeeping requirements for the WCPP outlined 
in this unit, for conditions of use that would not otherwise be 
prohibited one year after the effective date of this proposed 
regulation, EPA is also proposing that manufacturers, processors, 
distributors, and commercial users maintain ordinary business records, 
such as invoices and bills-of-lading, that demonstrate compliance with 
the prohibitions, restrictions, and other provisions of this proposed 
regulation; and to maintain such records for a period of 5 years from 
the date the record is generated. EPA is proposing that this compliance 
date would begin at the effective date of the rule (60 days following 
publication of the final rule in the Federal Register). Recordkeeping 
requirements would ensure that owners or operators can demonstrate 
compliance with the regulations if necessary. EPA may require more, 
less, or different documentation in the final rule based on 
consideration of public comments.
b. Downstream Notification
    For conditions of use that are not otherwise prohibited under this 
proposed regulation, EPA is proposing that manufacturers (including 
importers), processors, and distributors, excluding retailers, of TCE 
and TCE-containing products provide downstream notification of the 
prohibitions through the Safety Data Sheets (SDS) required by OSHA 
under 29 CFR 191.1200(g) by adding to sections 1(c) and 15 of the SDS 
the following language:
    After [DATE 6 MONTHS AFTER DATE OF PUBLICATION OF THE

[[Page 74752]]

FINAL RULE IN THE FEDERAL REGISTER], this chemical/product is and can 
only be domestically manufactured, imported, processed, or distributed 
in commerce for the following purposes until the following prohibitions 
take effect: (1) Processing as an intermediate (a) for the manufacture 
of HFC-134a until [DATE 8.5 YEARS AFTER DATE OF PUBLICATION OF THE 
FINAL RULE IN THE FEDERAL REGISTER] and (b) for all other processing as 
a reactant/intermediate until [DATE 2 YEARS AFTER DATE OF PUBLICATION 
OF THE FINAL RULE IN THE FEDERAL REGISTER]; (2) Industrial and 
commercial use as a solvent for open-top batch vapor degreasing until 
[DATE 1 YEAR AFTER DATE OF PUBLICATION OF FINAL RULE IN THE FEDERAL 
REGISTER]; (3) Industrial and commercial use as a solvent for closed-
loop batch vapor degreasing until [DATE 1 YEAR AFTER DATE OF 
PUBLICATION OF THE FINAL RULE IN THE FEDERAL REGISTER], except for 
industrial and commercial use as a solvent for closed-loop batch vapor 
degreasing necessary for human-rated rocket engine cleaning by NASA and 
its contractors until [DATE 7 YEARS AFTER DATE OF PUBLICATION OF THE 
FINAL RULE IN THE FEDERAL REGISTER], and except for industrial and 
commercial use as a solvent for closed-loop batch vapor degreasing for 
rayon fabric scouring for end use in rocket booster nozzle production 
by Federal agencies and their contractors until [DATE 10 YEARS AFTER 
DATE OF PUBLICATION OF THE FINAL RULE IN THE FEDERAL REGISTER]; (4) 
Industrial and commercial use in processing aid a) for battery 
separator manufacturing until [DATE 10 YEARS AFTER DATE OF PUBLICATION 
OF THE FINAL RULE IN THE FEDERAL REGISTER] and b) in process solvent 
used in polymer fiber spinning, fluoroelastomer manufacture and 
Alcantara manufacture; in extraction solvent used in caprolactam 
manufacture; and in precipitant used in beta-cyclodextrin manufacture 
until [DATE 2 YEARS AFTER DATE OF PUBLICATION OF THE FINAL RULE IN THE 
FEDERAL REGISTER]; (5) Industrial and commercial uses for DoD naval 
vessels and their systems, and in the maintenance, fabrication, and 
sustainment for and of such vessels and systems until [DATE 10 YEARS 
AFTER DATE OF PUBLICATION OF THE FINAL RULE IN THE FEDERAL REGISTER]; 
and (6) Industrial and commercial use for laboratory use for essential 
laboratory activities until [DATE 50 YEARS AFTER DATE OF PUBLICATION OF 
THE FINAL RULE IN THE FEDERAL REGISTER].
    The intention of downstream notification is to spread awareness 
throughout the supply chain of the restrictions on use of TCE under 
TSCA as well as provide information to commercial end users about 
allowable uses of TCE until the prohibition compliance dates.
    To provide adequate time to update the SDS and ensure that all 
products in the supply chain include the revised SDS, EPA is proposing 
a two-month period for manufacturers and a six-month period for 
processors and distributers to implement the proposed SDS changes 
following publication of the final rule.
    EPA requests comments on the appropriateness of identified 
compliance timeframes for recordkeeping and downstream notification 
requirements described in this unit.

B. Primary Alternative Regulatory Action

    As indicated by TSCA section 6(c)(2)(A)(iv)(II) through (III), EPA 
must consider and publish a statement based on reasonably available 
information with respect to the reasonably ascertainable economic 
consequences of the rule, including consideration of the costs and 
benefits and the cost effectiveness of the proposed regulatory action 
and one or more primary alternative regulatory actions considered by 
the Agency. This unit includes a description of the primary alternative 
regulatory action considered by the Agency. An overview of the proposed 
regulatory action and primary alternative regulatory actions for each 
condition of use is in Unit V.C.
    The primary alternative regulatory action described in this notice 
of proposed rulemaking (NPRM) and considered by EPA combines 
prohibitions and requirements for a WCPP. While in some ways it is 
similar to the proposed regulatory action, the primary alternative 
regulatory action described in this NPRM differs from the proposed 
regulatory action by providing longer timeframes for prohibitions, and 
by describing an ECEL based on a different health endpoint (i.e., 
immunotoxicity), as part of the WCPP that would be required for the 
conditions of use of TCE that would be permitted to continue for longer 
than one year after publication of the final rule until the prohibition 
compliance dates. As described in Unit IV.B., this ECEL is based on the 
endpoint used for EPA's unreasonable risk determination for TCE under 
TSCA, (i.e., immunotoxicity (Ref. 2), rather than the most sensitive 
health endpoint (developmental toxicity), which is the basis for the 
ECEL for the WCPP under the proposed regulatory action (the rationale 
for these differences is described in Unit VI.A.1.a.). EPA requests 
comment on this primary alternative regulatory action and whether any 
elements of this primary alternative regulatory action described in 
this unit should be considered as EPA develops the final regulatory 
action. For example, EPA could finalize a rule that includes the longer 
timeframes for prohibitions that are included in this primary 
alternative regulatory action and the ECEL based on the fetal cardiac 
defects endpoint (0.0011 ppm) that is included in the proposed 
regulatory action. EPA also requests comment on the practicability of 
the timeframes outlined in this unit compared to the timeframes 
identified for the proposed regulatory action in Unit V.A.
1. Prohibitions
    The primary alternative regulatory action considered by EPA would 
prohibit the manufacture (including import) and processing of TCE for 
all uses; prohibit the distribution in commerce and industrial and 
commercial use of TCE, as well as prohibitions on the disposal of TCE 
to industrial pre-treatment, industrial treatment, or publicly owned 
treatment works. The primary alternative regulatory action includes 
longer compliance timeframes for all prohibitions.
    Under the primary alternative action, the prohibitions would follow 
a staggered schedule and would generally take effect three months later 
than in the proposed regulatory action. Under a compliance timeframe 
that would be three months longer than the proposed regulatory action, 
the prohibitions for the manufacturing (including import) and 
processing would come into effect in 180 days (6 months) for 
manufacturers and 270 days (9 months) for processors, except for the 
manufacturing and processing associated with certain processing and 
industrial and commercial uses described later in this unit, due to 
supply chain considerations. Associated with this prohibition, EPA 
would prohibit the manufacturing (including import) and processing for 
all uses, including for all consumer uses, under the primary 
alternative regulatory action.

[[Page 74753]]

    The prohibition compliance dates for most industrial and commercial 
users would be one year after the publication of the final rule under 
the primary alternative regulatory action. However, under the primary 
alternative regulatory action, there would be longer timeframes for the 
prohibition of some industrial and commercial uses and for the 
associated manufacturing (including import) and processing. For all 
manufacturing (including import), processing, and industrial and 
commercial use of TCE that would continue more than one year after the 
publication of the final rule, the WCPP would be in effect until the 
respective prohibition compliance dates or, if applicable, expiration 
of the TSCA section 6(g) exemption. The WCPP under the primary 
alternative would include an ECEL of 0.004 ppm, as described in Units 
IV.B. and V.B.2. Furthermore, to aid with the implementation of the 
prohibitions under the primary alternative regulatory action, the 
prohibitions on distribution in commerce of TCE would take effect 
concurrent with the compliance date for the prohibition on the 
manufacture and processing TCE for a particular condition of use.
    For the two conditions of use that encompass industrial and 
commercial batch vapor degreasing (i.e., open-top and closed-loop), 
prohibitions under the primary alternative regulatory action described 
in this unit would take effect in 24 months for manufacturers, in 27 
months for processors, and in 30 months for the industrial and 
commercial users of TCE used as a solvent for open-top and closed-loop 
batch vapor degreasing after the publication date of the final rule 
(with the exception of industrial and commercial use of TCE as a 
solvent for closed-loop batch vapor degreasing for rayon fabric 
scouring for end use in rocket booster nozzle production by Federal 
agencies and their contractors, which is described in Unit V.B.3.).
    For certain processing and industrial and commercial conditions of 
use, the prohibitions under the primary alternative regulatory action 
described in this unit would take effect in two and a half years after 
the publication date of the final rule for manufacturers and in three 
years after the publication date of the final rule for processors for 
two conditions of use: (1) Processing as a reactant/intermediate, and 
(2) Industrial and commercial use as a processing aid in: process 
solvent used in battery manufacture; process solvent used in polymer 
fiber spinning, fluoroelastomer manufacture and Alcantara manufacture; 
extraction solvent used in caprolactam manufacture; and precipitant 
used in beta-cyclodextrin manufacture. Additionally, a TSCA section 
6(g) exemption would be part of the primary alternative regulatory 
action for the industrial and commercial use of TCE as a processing aid 
(specifically for battery separator manufacture) and industrial and 
commercial use of TCE as a solvent for closed-loop batch vapor 
degreasing for rayon fabric scouring for end use in rocket booster 
nozzle production by Federal agencies and their contractors (see Unit 
V.B.3.).
    Furthermore, compliance dates for prohibition would vary for 
processing TCE as an intermediate (specifically for HFC-134a 
manufacture), which would be subject to a longer phaseout, and for the 
prohibition of processing TCE as a reactant/intermediate. Under the 
primary alternative regulatory action, the manufacturing (including 
import) and processing of TCE as an intermediate for the manufacture of 
HFC-134a would be prohibited. Under the primary alternative regulatory 
action, there would be a nine-and-a-half-year phaseout (with an extra 
year to start compliance compared to the eight-and-a-half-year phaseout 
for the proposed regulatory action) following the requirements 
discussed in this unit. Under the primary alternative regulatory 
action, the prohibition would start one year later than under the 
proposed regulatory action, and thus the compliance timeframe would be 
one year longer than under the proposed regulatory action described in 
Unit V.A.1.b. Under the primary alternative regulatory action, a 
phaseout on processing of TCE as an intermediate for the manufacture of 
HFC-134a would begin at the final rule's effective date and end nine 
years and six months after the publication of the final rule. Within 18 
months after the publication of the final rule, any facility using TCE 
as a feedstock to manufacture HFC-134a in the United States would 
establish a baseline within 12 months after the publication of the 
final rule of the annual quantity of TCE processed by the facility as a 
feedstock to manufacture HFC-134a. While this is similar to the 
proposed regulatory action, the timeframes allowed for establishment of 
the baseline would be longer under the primary alternative regulatory 
action. The manufacturer would use the average of any 12 consecutive 
months in the preceding 36 months to calculate the baseline and would 
have records that demonstrate how the baseline annual volume was 
calculated. Following the establishment of a baseline volume, under the 
alternative regulatory action, following a similar four-step phaseout 
process described in Unit V.A., the following compliance dates would 
take effect after the publication of the final rule: (1) In three years 
and six months each manufacturer of HFC-134a who uses TCE as an 
intermediate would not be permitted to process TCE as an intermediate 
at an annual volume greater than 75 percent of the baseline so 
established; (2) In five years and six months each manufacturer of HFC-
134a who uses TCE as an intermediate would not be permitted to process 
TCE as an intermediate at an annual volume greater than 50 percent of 
the baseline so established; (3) In seven years and six months each 
manufacturer of HFC-134a who uses TCE as an intermediate would not be 
permitted to process TCE as an intermediate at an annual volume greater 
than 25 percent of the baseline so established; and (4) In nine years 
and six months each manufacturer of HFC-134a would be prohibited from 
using TCE as an intermediate. Additionally, manufacturing (including 
import) for this condition of use and distribution in commerce for this 
condition of use would follow a corresponding longer phaseout timeframe 
to account for the availability of TCE through the supply chain during 
the period of the phaseout of processing TCE as an intermediate for the 
manufacture of HFC-134a. Under the primary alternative regulatory 
action, regulated entities would keep records of the annual quantity of 
TCE purchased and processed from the year 2024 until the termination of 
all processing of TCE as an intermediate.
    EPA requests comment on the practicability of the timeframes 
outlined in this unit compared to the timeframes identified for the 
proposed regulatory action in Unit V.A.1.c., including consideration of 
the need for manufacturing (including import), and distribution in 
commerce to continue during the period of the phaseout.
    Furthermore, with regard to the prohibition of the disposal of TCE 
to industrial pre-treatment, industrial treatment, or publicly owned 
treatment works, under the primary alternative regulatory action, the 
prohibition would start three months later than under the proposed 
regulatory action, and thus the compliance timeframe would be two years 
and three months longer than under the proposed regulatory action 
described in Unit V.A.4. (description of disposal for the purposes of 
this rulemaking is provided in Unit III.B.2.d.). Under the primary 
alternative regulatory action, the prohibition described in this unit 
would take effect in three years for domestic manufacturers, 
processors, and

[[Page 74754]]

industrial and commercial users disposing of TCE to wastewater, 
including disposing of TCE-containing wastewater to industrial pre-
treatment, industrial treatment, or publicly owned treatment works. EPA 
recognizes there may be challenges in identifying and implementing an 
alternative disposal process separate from disposal of TCE to 
industrial pre-treatment, industrial treatment, or publicly owned 
treatment works. EPA requests comment on whether the three-year 
alternative timeline would be practicable or whether additional time is 
needed, for example, for a regulated entity to implement a change to 
their wastewater collection, treatment, or disposal processes or 
infrastructure, and what those alternative disposal methods may be.
2. Workplace Chemical Protection Program for Certain Conditions of Use
    As in the proposed regulatory action described in Unit V.A.1., 
EPA's primary alternative regulatory action would include a WCPP as a 
requirement, which would encompass an ECEL as well as dermal 
requirements to reduce inhalation and dermal exposures to TCE. However, 
the WCPP under the primary alternative regulatory action would include 
an ECEL based on a different health endpoint, immunotoxicity, as 
further discussed in this unit. The WCPP would be in place until the 
prohibition compliance date for those conditions of use of TCE that 
would continue for longer than one year after publication of the final 
rule, which would be: manufacturing (including import); processing: as 
a reactant/intermediate; incorporation into formulation, mixture or 
reaction product; repackaging; recycling; industrial and commercial 
use: as a solvent for open-top batch vapor degreasing; industrial and 
commercial use as a solvent for closed-loop batch vapor degreasing; and 
industrial and commercial use as a processing aid in process solvent 
used in battery manufacture; process solvent used in polymer fiber 
spinning, fluoroelastomer manufacture and Alcantara manufacture; 
extraction solvent used in caprolactam manufacture; and precipitant 
used in beta-cyclodextrin manufacture.
    As discussed in Unit V.A.2., and for the reasons described in Unit 
V., EPA does not believe that long-term implementation of the WCPP 
would be a feasible means of addressing unreasonable risk indefinitely 
and that prohibition of the affected COUs would ultimately be necessary 
to eliminate the unreasonable risk. Under the primary alternative 
regulatory action, the WCPP for several conditions of use of TCE would 
reduce to the extent possible the unreasonable risk during the time 
period before a prohibition would become effective.
    For the primary alternative regulatory action, the WCPP would 
encompass an ECEL based on immunotoxicity, following the associated 
implementation requirements discussed in Unit V.A.2., in addition to 
longer timeframes described in this unit. EPA's primary alternative 
regulatory action includes an ECEL of 0.0040 ppm (0.021 mg/m3) as an 
eight-hour TWA, which is based on the chronic non-cancer occupational 
HEC for autoimmunity (Ref. 14). As discussed in Unit VI.A., among the 
adverse health effects, the drivers for EPA's revised unreasonable risk 
determination for TCE under TSCA were identified as cancer, 
immunotoxicity, acute immunosuppression and chronic autoimmunity from 
inhalation and dermal exposures (Ref. 2). Therefore, reducing the 
remaining exposures to or below the ECEL of 0.0040 ppm would address 
the unreasonable risk of injury to health from TCE that is driven by 
inhalation exposures in an occupational setting (Refs. 1, 14). If 
ambient exposures are kept at or below the eight-hour ECEL of 0.0040 
ppm, EPA expects that workers and ONUs would be protected against not 
only the chronic non-cancer effects for autoimmunity described in Unit 
III.B.2., but also effects resulting from acute non-cancer exposure 
(immunosuppression) and cancer. Associated with the ECEL of 0.0040 ppm, 
under the alternative regulatory action, EPA would establish an ECEL 
action level at half of the eight-hour ECEL, or 0.002 ppm as an eight-
hour time-weighted average.
    EPA believes that longer timeframes may facilitate compliance; 
therefore, the primary alternative regulatory action would provide 
longer timeframes for implementation of a WCPP than the proposed 
regulatory action. With a compliance timeframe that would be six months 
later than in the proposed regulatory action, the compliance timeframe 
for the WCPP under the primary alternative regulatory action would be 
extended as follows: regulated entities would establish initial 
exposure monitoring according to the process outlined in Unit V.A.2.ii. 
within 12 months (in contrast to six months in the proposed regulatory 
action described in Unit V.A.2.ii.) and proceed accordingly, based on 
the outcome of the initial monitoring. EPA requests comment on the 
ability of regulated entities to conduct initial monitoring within 12 
months, anticipated timeframes for any procedural adjustments needed to 
comply with the requirements, and the extent to which this option could 
result in additional exposure, compared to the proposed regulatory 
option as described in Unit V.A. Overall, EPA requests comment on the 
practicability of the timeframes outlined in this unit, when compared 
to the timeframes identified for the proposed regulatory action in Unit 
V.A. EPA requests comment on whether any elements of the primary 
alternative regulatory action described in this unit should be 
considered as EPA develops the final regulatory action, e.g., whether 
EPA should consider the timeframes for implementation of a WCPP 
presented in this primary alternative regulatory action and the ECEL 
value presented in the proposed regulatory action.
    EPA does not have sufficient information as to whether the 
conditions of use that would continue for longer than one year under 
the primary alternative regulatory action listed in this unit could 
meet requirements of a WCPP for TCE, including an ECEL of 0.0040 ppm 
for TCE. Therefore, EPA requests comment on the existing practices 
(e.g., engineering controls, administrative controls, PPE) involving 
TCE use in these conditions of use, as to whether activities may take 
place in closed systems and the degree to which users of TCE in these 
sectors could successfully implement an ECEL of 0.0040 ppm, dermal 
protection, and ancillary requirements, described in Unit V.A.2., until 
the prohibitions would become effective, including for the 
manufacturing, processing, and distribution in commerce that account 
for the supply chain.
3. TSCA Section 6(g) Exemptions
    Under TSCA section 6(g)(1), EPA may grant an exemption from a 
requirement of a TSCA section 6(a) rule for uses that are critical or 
essential. Based on discussions with and information provided by 
industry stakeholders and consultation with other Federal agencies, EPA 
has analyzed the need for two different exemptions, described in the 
proposed regulatory action discussed in Units I.A.3.a. and b., and 
would grant both with a longer time limit if the primary alternative 
regulatory action described in this NPRM is adopted in the final rule. 
Furthermore, under the primary alternative regulatory action, EPA has 
analyzed the need for additional exemptions for essential uses of open-
top and closed-loop batch vapor degreasing for aerospace use (including

[[Page 74755]]

for rayon fabric scouring for rocket booster nozzle production) as well 
as narrow tubing used in medical devices, and EPA would provide the 
additional exemptions if the primary alternative regulatory action 
described in this NPRM is adopted in the final rule. (EPA notes that 
the use of TCE for vapor degreasing narrow tubing used in medical 
devices is not excluded by TSCA section (3)(2)(B)(vi) because TCE is 
not intended to become part of the medical device that incorporates the 
narrow tubing). This unit presents the results of the analysis for the 
requested exemption for industrial and commercial use of TCE in vapor 
degreasing, as well as the time limits indicated under the primary 
alternative regulatory action.
a. Primary Alternative Analysis of the Need for TSCA Section 6(g)(1) 
Exemptions for Uses of TCE That Are Critical or Essential
i. Analysis of the Need for a TSCA Section 6(g)(1)(B) Exemption for 
Industrial and Commercial Use of TCE in Vapor Degreasing for Essential 
Aerospace Parts and Components
    EPA has conducted an analysis of the application of this rulemaking 
to the industrial and commercial use of TCE in vapor degreasing and 
found that a TSCA section 6(g) exemption may be warranted for certain 
aerospace parts and components if the primary alternative regulatory 
action considered by EPA is adopted, in its entirety or in relevant 
part, in the final rule.
    EPA received a request for a TSCA section 6(g) exemption from 
prohibition for the use of TCE in vapor degreasing of aerospace parts 
from a manufacturer of commercial jetliners and defense, space, and 
security systems (Refs. 60 and 61). As the requester describes, they 
manufacture and procure these parts and have identified that TCE vapor 
degreasing is necessary due to technical challenges with other 
substitute chemicals or alternative methods.
    The requester has spent many years developing, qualifying, and 
implementing alternative materials and processes to replace TCE vapor 
degreasing with aqueous cleaning where technically viable. According to 
the requester, while the transition to aqueous cleaning has been 
successful for many detail parts (e.g., stringers, spars, seat tracks, 
brackets, etc.), substitutes and alternative processes do not meet the 
technical specifications required to clean certain complex aerospace 
parts, specifically, gaseous oxygen tubing systems, non-oxygen tubing, 
as well as honeycomb core and rotorcraft mechanical systems. The 
requester notes the ongoing research and development activities over 
the years for the TCE vapor degreasing uses without viable 
alternatives, and highlights that a potential replacement technology 
has been identified for vapor degreasing oxygen and non-oxygen tubing 
systems. However, for the honeycomb core and rotorcraft mechanical 
systems parts, the requestor explains the continued challenge to 
identify a replacement solvent due to entrapment issues (i.e., a 
solvent carried out of a degreaser that adheres to or is entrapped in 
the part being removed) and processing concerns.
    The requester notes that an adequate transition period for this 
technically challenging aerospace use requires substantial investment 
and time to develop viable alternatives. The requester is currently in 
the process of identifying a replacement solvent that can adequately 
clean, cause no harm to parts, and is not an equally toxic material to 
TCE. Based on the submitted request, conversion from vapor degreasing 
to aqueous cleaning is a capital-intensive investment that the 
requester expects would require several years to plan, permit, 
construct, and install. Additionally, the requester notes that the 
aerospace industry needs to ensure that aerospace parts meet DOD and 
other Federal Aviation Administration (FAA) specifications to ensure 
safety of flight. For example, in order to replace the chemical with an 
alternative, the requester notes that they must identify, test, and 
select an alternative that meets technical requirements derived from 
FAA mandated standards for a typical part used in a commercial 
aircraft, such as specifications for specific gravity (ASTM D 792), 
Water Absorption (ASTM D 750), and other test requirements, which may 
be a lengthy process (Ref. 62). According to the information submitted, 
certification with FAA could take at least nine months for individual 
parts of components or up to several years for major subsystems or 
complete aircraft (Ref. 62). The requester also notes that while they 
do not know the extent that their supply chain has transitioned away 
from use of TCE in vapor degreasing, TCE has been used in vapor 
degreasing to meet required levels of cleanliness of certain supplied 
parts by long-standing design specifications that are incorporated into 
contracts of a complex supply chain. The requester also told EPA the 
suppliers are not required to inform the requester of the process they 
use to clean parts that the supplier provides to the requester, and the 
requester therefore may not know which solvent a supplier has selected 
for vapor degreasing or what factors were considered when selecting 
cleaning systems. According to the requester, material declarations and 
auditing processes to validate usage may be burdensome, considering 
that a large portion of the requester's supply chain includes small 
suppliers. Due to the concerns raised with transitioning to aqueous 
cleaning or another new cleaning method, the requester has requested 
that EPA exempt use of TCE in vapor degreasing of aerospace parts for 
10 years.
    As discussed in this unit, substitute chemicals for vapor 
degreasing of aerospace parts may not be available at this time for 
meeting the cleanliness standards of certain parts as required by DOD 
and FAA specifications or other specifications included in existing 
contracts within the supply chain such that significant disruption to 
national security and critical infrastructure would occur without a 
longer timeframe for transition to an alternative. More time is needed 
for companies to make the capital-intensive transition from TCE vapor 
degreasing to aqueous cleaning for those parts that can be cleaned 
using the aqueous method. In addition, the requester states that they 
are continuing to work towards identifying a replacement solvent that 
is able to adequately clean complex machining parts and actuation 
systems parts without harming them and that is not a regrettable 
substitution. Therefore, EPA has preliminarily determined that if the 
use of TCE for vapor degreasing were not available in the near term for 
aerospace parts, or if industry could not meet the requirements of the 
prohibition considered as the proposed regulatory action, compliance 
with such requirement could significantly disrupt national security and 
critical infrastructure. In addition, due to availability concerns, EPA 
has preliminarily determined that a ban on the manufacture, processing, 
and distribution in commerce of TCE for vapor degreasing of aerospace 
parts could also significantly disrupt national security and critical 
infrastructure. A prohibition on the use of TCE for vapor degreasing of 
aerospace parts could negatively affect DOD's capability and readiness, 
which includes the ability to adequately maintain aircraft. Such a 
prohibition could also negatively affect the maintenance of civilian 
aircraft and potentially have impacts on the safety of civilian flight.
    Similarly, EPA is aware of a highly specific use of vapor 
degreasing for

[[Page 74756]]

aerospace components as part of production of booster rocket nozzles 
for national security or critical infrastructure uses (Ref. 43). In the 
production of booster rocket nozzles, TCE is used in vapor degreasing 
as a solvent in rayon fabric scouring, an intensive cleaning process to 
remove contaminants. Cleaning is a critical step of this process; if 
contaminants are not sufficiently removed in the scouring stage, the 
fabric will be degraded during the chemical reaction that occurs during 
carbonization which could result in failure of the nozzle during a 
launch and catastrophic effects for the rockets.
    A Federal agency involved in this use, specifically NASA, has 
attempted at length to identify an alternative to TCE in vapor 
degreasing; while NASA had preliminarily identified an alternative 
solvent, the manufacturer of the substitute chemical announced they 
would be voluntarily ceasing production (Ref. 63), making this 
alternative solvent no longer viable. NASA has restarted the 
identification and qualification of a non-TCE cleaning method. While 
aqueous cleaning has been explored as an alternative method of rayon 
fabric scouring, it is not a viable alternative as the rayon fiber is 
hydrophilic and water can cause damage to the fiber itself, impacting 
its ablation performance (Ref. 43). Currently, substitutes and 
alternative processes do not meet the technical specifications required 
to clean the rayon fabric in order to safely produce and launch rockets 
that are important for national security or critical infrastructure. 
NASA has provided to EPA an estimated timeline for the identification 
and replacement of TCE in the vapor degreasing of this component. The 
replacement of TCE involves intense testing as it is part of 
spaceflight, notably a new process would have to undergo various rounds 
of testing culminating in a full-scale static motor test using a 
booster nozzle manufactured with an alternative cleaning solvent. For 
NASA specifically, the first opportunity to conduct a full-scale static 
motor test with a booster nozzle produced using a non-TCE alternative 
would be 2027; before that is planned to occur, NASA has launches 
planned with eight booster rockets, which cannot proceed unless all 
components are safely produced. Therefore, EPA has preliminarily 
determined that if TCE was not available for this sub-use of closed-
loop batch vapor degreasing for this aerospace component, there would 
be a significant, disruptive impact on national security and critical 
infrastructure. In addition, due to availability concerns, EPA has 
preliminarily determined that a ban on the manufacture, processing, and 
distribution in commerce of TCE for vapor degreasing of aerospace parts 
could also significantly disrupt national security and critical 
infrastructure.
ii. Analysis of the Need for a TSCA Section 6(g)(1)(A) Exemption for 
Industrial and Commercial Use of TCE in Closed-Loop and Open-Top Batch 
Vapor Degreasing for Narrow Tubing Used in Medical Devices
    EPA also finds that a TSCA section 6(g)(1)(A) exemption may be 
warranted for vapor degreasing of narrow metal tubing used in medical 
devices if the primary alternative regulatory action considered by EPA 
is adopted in the final rule. According to a manufacturer of metal 
tubing for medical devices (Ref. 64), TCE is the only solvent that they 
have found that effectively removes all lubricants from their tubing 
products, allowing them to meet the stringent cleanliness standards for 
medical devices.
    Information provided to EPA from the tubing manufacturer indicates 
that their tubing products consist of over 20 different alloys 
processed with more than 25 different lubricants, for use primarily in 
the medical industry. The tubing is incorporated into devices used in 
the body for diagnostic and surgical procedures as well as permanent 
implants for orthopedic and cardiovascular applications. The tubing 
produced by the manufacturer ranges in diameter from 0.005'' to 
0.625'', and both the inner and outer diameters of the tubing must be 
degreased at various points in the manufacturing process (Ref. 64).
    According to this manufacturer, the use of specialty lubricants in 
the drawing and annealing processes create unique degreasing demands 
for narrow tube manufacturers and TCE has historically been the 
industry standard for effective removal of these lubricants. 
Cleanliness is paramount, as even the slightest degreasing failure may 
cause corrosion, which could result in a critical failure of an 
implantable medical device. Alternative solvents such as methylene 
chloride or 1-bromopropane are not feasible alternatives for a variety 
of reasons, including that they do not always achieve the required 
cleanliness standards, could result in a facility exceeding emission 
caps under the Clean Air Act, and are also in the process of being 
regulated by EPA under TSCA. Other alternative chemicals have been 
explored by the manufacturer, such as parachlorobenzotrifluoride, which 
is not a hazardous air pollutant under the Clean Air Act. While 
promising, this solvent could not remove some of the manufacturer's 
lubricants and specialty coatings, thus not meeting the customer's 
cleanliness standard. This alternative is also flammable, which would 
require additional equipment design and infrastructure to use safely.
    The information provided by this manufacturer of tubing for use in 
medical devices regarding TCE vapor degreasing is consistent with the 
information provided by the aerospace industry regarding challenges 
with finding a replacement for TCE in vapor degreasing of tubing. It is 
also consistent with information provided to EPA during the public 
comment period for EPA's 2017 proposal on TCE in vapor degreasing (82 
FR 7432, January 19, 2017). A commenter on that proposal indicated that 
aqueous cleaners did not effectively remove most of the materials in 
their lubrication system, so effective lubricants and coating systems 
would need to be developed that are compatible with aqueous cleaners 
(Ref. 65). Experiments with other lubricants were not successful, the 
commenter found that lubricants that could be effectively aqueous 
degreased were less effective at lubricating, requiring more drawing 
steps as well as more cleaning steps. Further, according to this 
commenter, aqueous cleaning requires large, heated water tanks and hot 
air drying chambers, increasing energy use and industrial effluent 
volumes.
    In addition, EPA did not impose additional Clean Air Act emission 
reductions on aerospace manufacturing and maintenance facilities or on 
facilities manufacturing narrow tubing in 2007, recognizing the unique 
nature of the vapor degreasing done by these industries. In the 2007 
final rule, EPA found that the level of control called for by the 1994 
National Emission Standard for Halogenated Solvent Cleaning for 
aerospace manufacturing and maintenance and narrow tube manufacturing 
facilities reduced hazardous air pollutant emissions to levels that 
presented an acceptable level of risk, protected public health with an 
ample margin of safety, and prevented any adverse environmental effects 
(Ref. 66). As noted in the 2007 final rule, the finding regarding an 
``ample margin of safety'' was based on a consideration of the 
additional costs of further control as represented by compliance with 
emissions limits adapted for these industry sectors, considering 
availability of technology, costs and time to comply with further 
controls.

[[Page 74757]]

EPA further notes that the term ``narrow tube'' as used in the 2007 
final rule was tubing with a portion of the outside diameter being a 
quarter of an inch or less, which is different from the diameters 
provided by the narrow tube manufacturer (Ref. 64).
    EPA acknowledges the importance of properly cleaned narrow tubing 
used in medical devices. The failure of a medical device used in a 
medical or surgical procedure, or implanted in the body, can have 
immediate and significant negative impacts on human health. Further, a 
complete prohibition on the use of TCE for vapor degreasing in the near 
term could result in shortages of narrow tubing for use in such medical 
devices, which would also have significant negative impacts on human 
health. Therefore, EPA requests comment on the extent to which the use 
of TCE for vapor degreasing of narrow tubing is a critical use for 
which no technically and economically feasible safer alternative is 
available. In addition, due to availability concerns, a ban on the 
manufacture, processing, and distribution in commerce of TCE for vapor 
degreasing of narrow tubing used in medical devices could significantly 
disrupt a critical use for which no technically and economically 
feasible safer alternative is available.
iii. Analysis of the Need for a TSCA Section 6(g)(1)(A) Exemption for 
Industrial and Commercial Use of TCE as a Processing Aid for Specialty 
Polymeric Microporous Sheet Materials
    EPA has conducted an analysis of the application of this rulemaking 
to the industrial and commercial use of TCE as a processing aid and 
preliminarily found that a TSCA section 6(g)(1)(A) exemption may be 
warranted for certain industrial and commercial purposes if the primary 
alternative regulatory action considered by EPA is adopted, in its 
entirety or in relevant part, in the final rule. As part of industry 
stakeholder engagement, EPA was made aware that at least one U.S. 
materials manufacturer relies on TCE to manufacture a specialty 
microporous sheet material. This company has requested an exemption 
under TSCA section 6(g) for the continued use of TCE for this purpose 
(Ref. 67).
    As the requestor describes, specialty polymeric microporous sheet 
materials are fundamental components in the production of critical or 
essential products. EPA preliminarily agrees that certain applications 
of these specialty polymeric microporous sheet materials are critical 
and essential uses for which no technically and economically feasible 
safer alternative is available. This exemption on processing TCE would 
be limited to processing for applications of the specialty polymeric 
microporous sheet materials that are critical and essential, 
specifically; driver's licenses and identification cards of U.S. states 
and territories; passports (including U.S. passports and e-passports); 
labels for chemical drums, complex filtration elements and cartridges 
(such as for oil/water and bilge water separations); and for use in 
membranes in energy recovery ventilators. Any application of the 
specialty polymeric microporous sheet materials for uses not listed 
above would not be covered under this exemption.
    EPA believes that these uses would preliminarily also qualify for 
an exemption under TSCA section 6(g)(1)(B). These critical and 
essential products are also important for the national economy, 
national security, and critical infrastructure and EPA preliminarily 
agrees that compliance with the prohibition within the timeframes 
proposed would be disruptive. The proper identification of individuals 
is important for maintaining national security and critical 
infrastructure. Systems such as travel, healthcare, and law are all 
reliant on identification. Further, the proper labeling of chemicals is 
important for protecting critical infrastructure. Similarly, complex 
filtration elements and cartridges (such as for oil/water and bilge 
water separations) and membranes in energy recovery ventilation are 
essential for the operations of critical infrastructure.
    Each of these products includes the use of TCE in their 
development. The requester described the specific use of TCE as a 
``process solvent'' during the manufacturing of a ``unique polymeric 
microporous sheet material'' (Ref. 67). The company makes the 
microporous sheet material using process oil (white mineral oil) during 
the extrusion process in order to form a thin plastic sheet containing 
55-60% process oil by weight. The process oil is then removed from the 
plastic sheet, which requires the use of a solvent (i.e., TCE) to 
rapidly extract the process oil and leave behind the desired 
microporosity for the material. The requestor describes how specific 
microporosity is important for performance of the material. Once the 
solvent has removed the oil from the sheet, the solvent must be 
evaporated to remove it from the sheet; post-evaporation, the separator 
must leave behind the desired microporosity crucial to the performance 
of the material. Finally, the extracted oil and much of the TCE is 
captured and reused in the extraction process. TCE that is not captured 
and reused is released from a discharge stack; the requestor describes 
that the air released contains no more than 10 ppm of TCE.
    The requestor describes this manufacturing process as well-
established and reliant on TCE as a high-performance process solvent 
that provides a unique combination of chemical properties (e.g., non-
flammability, rapid extrusion of process oil, compatibility with 
process equipment, etc.). The requestor describes how this unique 
combination of properties facilitate the controlled removal of process 
oil in the production of the specialty polymeric microporous sheet 
material, resulting in the specific microporosity important for the 
performance of the material.
    The requester has provided some details to EPA on its efforts to 
reduce worker exposure to TCE. The exposure mitigation program includes 
a separate area under negative pressure for TCE processing and use of 
PPE as necessary to comply with the OSHA PEL for TCE (Refs. 67, 10). 
While EPA's proposed ECEL is much lower than the OSHA PEL, EPA expects 
the requester to make appropriate changes to its worker exposure 
mitigation program to comply with the WCPP and attempt to meet the ECEL 
to the extent possible for the duration of this exemption.
    According to the requester, there are several properties that make 
TCE uniquely suitable for use in the manufacture of the specialty 
microporous sheet material. The key properties described by the 
requester include TCE's rapid extraction of process oil, the ease by 
which TCE is distilled from the process oil for recovery and reuse, and 
its vapor pressure, which both allows for evaporation and permits 
condensation from the atmosphere. TCE is also non-flammable. The 
requester evaluated more than a dozen potential alternatives that could 
be compatible with their process for manufacturing specialty polymeric 
microporous sheet materials, including hexane, trans-1,2-
dichloroethylene, perchloroethylene, and 1-bromopropane. Many of these 
substitutes were found to be less effective than TCE at extracting 
process oils, while some were not as easily recovered and reused. Even 
the more promising solvents, such as perchloroethylene, were not drop-
in replacements and would, according to the requester, require 
expensive equipment modifications and a multi-year approval process. 
Many of the potential substitute chemicals would need to be blended 
with an HFC that is

[[Page 74758]]

being phased out, or the chemical itself is being phased out due to 
concern over PFAS or due to high Global Warming Potential. In addition 
to these challenges, the requestor describes how any blend would be a 
challenging substitute because the different chemicals in the blend 
evaporate at different rates and could become flammable during this 
process. The requester emphasized that it is using modeling to seek out 
potential alternatives, but that further study is required and that 
there is no other chemical alternative that is suitable or available to 
replace TCE in this process. Based on the requester's submission and 
EPA's general understanding of the manufacturing process for the 
specialty microporous sheet material, EPA believes that there are no 
feasible alternatives to TCE available at present.
    While the requester did not describe a time limit for the 
exemption, EPA has identified a 15-year time-limited TSCA section 6(g) 
exemption under the alternative regulatory action. EPA believes that a 
15-year exemption from the prohibition on the industrial and commercial 
use of TCE as a processing aid, specific to the manufacturing of 
specialty microporous sheet materials, would be reasonable because it 
would be sufficient to provide EPA with an updated analysis of any 
technically feasible alternative, the supply chain of the U.S. 
materials industry, as well as global innovation and production in 
high-technology products. Under TSCA section 6(g), EPA can consider 
revisiting or extending time-limited exemptions by rulemaking until a 
safer, feasible alternative becomes available. EPA requests comment on 
whether 15 years is an appropriate timeframe for the proposed TSCA 
section 6(g) exemption for industrial and commercial use of TCE as a 
processing aid for specialty polymeric microporous sheet materials.
b. Primary Alternative Exemptions for Uses of TCE That Are Critical or 
Essential
i. Primary Alternative 15-Year Exemption for Industrial and Commercial 
Use as a Processing Aid for Battery Separator Manufacturing (Lead-Acid 
and Lithium Battery Separators)
    As part of the primary alternative regulatory action, based on the 
analysis in Unit V.A.3.a.i., EPA would grant a 15-year exemption from 
the prohibition on TCE for the industrial and commercial use as a 
processing aid for battery separator manufacturing. The primary 
alternative regulatory action differs from the proposed regulatory 
action in that it extends the compliance date for the exemption by five 
years, allowing a longer timeframe for stakeholders to continue the use 
until its prohibition, in recognition of the challenge to transition to 
an alternative chemical or process, further discussed in Unit V.B. The 
conditions for the exemption under the primary alternative regulatory 
action would be: (1) The use of TCE would be limited to use as a 
processing aid for battery separator manufacturing to supply the 
essential battery components to continue to support the national 
economy, national security, and critical infrastructure; (2) this 
specific industrial and commercial use of TCE as a processing aid must 
be conducted at industrial facilities already using TCE to supply the 
lithium ion or lead acid battery components; and (3) Industry 
stakeholders who use TCE as a processing aid for battery separator 
manufacturing and entities that manufacture (including import), 
process, and distribute in commerce TCE to be available as a processing 
aid must comply with the WCPP requirements described in Unit V.B.2., 
including meeting the ECEL to the extent possible until the prohibition 
compliance date.
ii. Primary Alternative 30-Year Exemption for Industrial and Commercial 
Use of TCE in Laboratory Use for Essential Laboratory Activities
    As part of the primary alternative regulatory action, based on the 
analysis discussed in Unit V.A.3.a.iii., there would be a 30-year 
exemption from the prohibition on TCE in other miscellaneous industrial 
and commercial use of TCE in laboratory use for essential laboratory 
activities. The primary alternative regulatory action differs from the 
proposed regulatory action in that it shortens the compliance date by 
20 years. The conditions for the primary alternative proposed exemption 
are: (1) The use of TCE is limited to uses in an industrial or 
commercial laboratory for essential laboratory activities, including 
chemical analysis, chemical synthesis, extracting and purifying other 
chemicals, dissolving other substances, with the exclusion of 
laboratory testing for asphalt; and (2) Stakeholders who use TCE in 
laboratory settings and stakeholders who manufacture (including 
import), process, and distribute in commerce TCE to be available as a 
laboratory chemical must comply with the WCPP requirements described in 
Unit V.B.2., including meeting the ECEL to the extent possible until 
the prohibition compliance date.
iii. Primary Alternative Seven-Year Exemption for Industrial and 
Commercial Use of TCE in Batch Vapor Degreasing for Essential Aerospace 
Parts and Components and Narrow Tubing Used in Medical Devices
    For the reasons discussed in this unit, EPA would grant a seven-
year exemption from the prohibition as part of the primary alternative 
regulatory action for the industrial and commercial use of TCE in batch 
vapor degreasing for essential aerospace parts and components and 
narrow tubing used in medical devices. While one requester suggested 
that an appropriate length of time for an exemption would be 10 years, 
and another did not specify, EPA notes that a prohibition on vapor 
degreasing with TCE for all uses was proposed in 2017 (Ref. 68). While 
that proposal was withdrawn pending the completion of a risk evaluation 
for TCE under amended TSCA, which included the evaluation of the vapor 
degreasing conditions of use, EPA expects that certain stakeholders 
have made significant progress on substitutes since then in 
anticipation of similar restrictions on TCE under amended TSCA. For 
instance, EPA is aware that many users have transitioned to a 
substitute for TCE where possible or are planning for technologically 
feasible adjustments (Refs. 32, 43).
    The conditions for the exemption would be: (1) TCE could only be 
used for batch vapor degreasing of aerospace parts or components 
(including rayon fabric) where other alternatives present technical 
feasibility or cleaning performance challenges to meet specifications 
from other Federal agencies or other long-standing design 
specifications that are included in existing contracts, or for batch 
vapor degreasing of narrow tubing used in medical devices; and (2) 
Industry stakeholders who use TCE for batch vapor degreasing of 
aerospace parts or components or narrow tubing used in medical devices 
and entities that manufacture (including import), process, and 
distribute in commerce TCE to be available for TCE vapor degreasing 
would comply with the WCPP requirements described in Unit V.B.2. to the 
extent possible until the prohibition compliance date. EPA requests 
comments on all aspects of the exemption request and the exemption in 
the primary alternative regulatory action from the prohibition on use 
of TCE in batch vapor degreasing, including whether compliance with the 
WCPP should also be required during the period of the exemption. 
Additionally, EPA is soliciting comment on whether

[[Page 74759]]

it should specify the type of batch vapor degreasing operation, such as 
open-top or closed loop batch vapor degreasing, that would be exempt 
from prohibition as part of the primary alternative regulatory action 
for the industrial and commercial use of TCE in batch vapor degreasing 
for essential aerospace parts and components and narrow tubing for 
medical devices. EPA also requests comment whether it should consider 
different exemption timeframes for different types of vapor degreasing 
operations.
iv. Primary Alternative 15-Year TSCA Section 6(G)(1)(A) Exemption for 
Industrial and Commercial Use of TCE as a Processing Aid for Specialty 
Polymeric Microporous Sheet Materials
    As part of the primary alternative regulatory action, based on the 
analysis in Unit V.A.3.c., EPA would grant a 15-year exemption from the 
prohibition on TCE for the industrial and commercial use as a 
processing aid for specialty polymeric microporous sheet material 
manufacturing. Under the primary alternative regulatory action, in 
accordance with TSCA section 6(g)(4), the conditions for the exemption 
that EPA believes are necessary to protect health and the environment 
would be: (1) The use of TCE would be limited to use as a processing 
aid for the manufacturing of specialty polymeric microporous sheet 
materials; and (2) Stakeholders who use TCE as a processing aid for the 
manufacturing of specialty polymeric microporous sheet materials and 
entities that manufacture (including import), process, and distribute 
in commerce TCE to be available as a processing aid must comply with 
the WCPP requirements described in Unit V.B.2., including meeting the 
ECEL to the extent possible until the prohibition compliance date. EPA 
requests comments on all aspects of the exemption in the primary 
alternative regulatory action from the prohibition on industrial and 
commercial use of TCE as a processing aid, specific to the 
manufacturing of specialty microporous sheet materials, including 
whether compliance with the WCPP should also be required during the 
period of the exemption. EPA also requests comment on whether 15 years 
would be an appropriate timeframe for a TSCA section 6(g)(1)(A) 
exemption for this use.

C. Overview of Conditions of Use and Proposed Regulatory Action and 
Primary Alternative Regulatory Action

    Table 2 is a side-by-side depiction of the proposed regulatory 
action with the primary alternative action for each condition of use 
identified as driving the unreasonable risk (Ref. 2). The purpose of 
this table is to succinctly convey to the public the major differences 
between the proposed regulatory action and the primary alternative 
regulatory action; as such the actions in each column are truncated and 
do not necessarily reflect all the details of the proposed and 
alternative regulatory action, including differences in timeframes. EPA 
notes that ``prohibit + WCPP'' listed in the table indicates that a 
condition of use would be prohibited, but in the time before the 
prohibition goes into effect, there would be a WCPP. For the proposed 
action, the WCPP would include an ECEL of 0.0011 ppm based on the fetal 
cardiac defects endpoint so that the developing fetus is best protected 
(see Unit V.A.), especially for the sensitive PESS group of older 
pregnant workers and ONUs (the group identified as most susceptible to 
fetal cardiac defects), while under the primary alternative regulatory 
action, the WCPP would include an ECEL of 0.0040 ppm based on the 
immunotoxicity endpoint (see Unit V.B.). The rationale for these 
differences is detailed in Unit VI.A.1.
    The proposed and alternative regulatory actions are described more 
fully in Units V.A. and B.

     Table 2--Overview of Proposed Regulatory Action and Alternative
                 Regulatory Action by Conditions of Use
------------------------------------------------------------------------
                                                Action
                             -------------------------------------------
      Condition of use         Proposed regulatory   Primary alternative
                                   action \1\              action
------------------------------------------------------------------------
Manufacturing: domestic       Prohibit + WCPP       Prohibit + WCPP
 manufacture.                  includes an ECEL of   includes an ECEL of
                               0.0011 ppm for        0.0040 ppm for
                               inhalation            inhalation
                               exposures to TCE as   exposures to TCE as
                               an eight-hour TWA     an eight-hour TWA
                               based on              based on
                               developmental         immunotoxicity.
                               toxicity.
Manufacturing: import.......  Prohibit + WCPP       Prohibit + WCPP
                               includes an ECEL of   includes an ECEL of
                               0.0011 ppm for        0.0040 ppm for
                               inhalation            inhalation
                               exposures to TCE as   exposures to TCE as
                               an eight-hour TWA     an eight-hour TWA
                               based on              based on
                               developmental         immunotoxicity.
                               toxicity.
Processing: processing as a   Prohibit; includes a  Prohibit; includes a
 reactant/intermediate.        phaseout of TCE for   phaseout of TCE for
                               processing as an      processing as an
                               intermediate for      intermediate for
                               the manufacture of    the manufacture of
                               HFC-134a + WCPP       HFC-134a + WCPP
                               includes an ECEL of   includes an ECEL of
                               0.0011 ppm for        0.0040 ppm for
                               inhalation            inhalation
                               exposures to TCE as   exposures to TCE as
                               an eight-hour TWA     an eight-hour TWA
                               based on              based on
                               developmental         immunotoxicity.
                               toxicity.
Processing: incorporation     Prohibit + WCPP       Prohibit + WCPP
 into a formulation,           includes an ECEL of   includes an ECEL of
 mixture, or reaction          0.0011 ppm for        0.0040 ppm for
 product.                      inhalation            inhalation
                               exposures to TCE as   exposures to TCE as
                               an eight-hour TWA     an eight-hour TWA
                               based on              based on
                               developmental         immunotoxicity.
                               toxicity.
Processing: incorporation     Prohibit............  Prohibit.
 into articles.
Processing: repackaging.....  Prohibit + WCPP       Prohibit + WCPP
                               includes an ECEL of   includes an ECEL of
                               0.0011 ppm for        0.0040 ppm for
                               inhalation            inhalation
                               exposures to TCE as   exposures to TCE as
                               an eight-hour TWA     an eight-hour TWA
                               based on              based on
                               developmental         immunotoxicity.
                               toxicity.
Processing: recycling.......  Prohibit + WCPP       Prohibit + WCPP
                               includes an ECEL of   includes an ECEL of
                               0.0011 ppm for        0.0040 ppm for
                               inhalation            inhalation
                               exposures to TCE as   exposures to TCE as
                               an eight-hour TWA     an eight-hour TWA
                               based on              based on
                               developmental         immunotoxicity.
                               toxicity.

[[Page 74760]]

 
Industrial and commercial     Prohibit............  Prohibit; includes a
 use as a solvent for open-                          TSCA section 6(g)
 top batch vapor degreasing.                         exemption for the
                                                     industrial and
                                                     commercial use as
                                                     solvent for open-
                                                     top batch vapor
                                                     degreasing for
                                                     essential aerospace
                                                     use + WCPP includes
                                                     an ECEL of 0.0040
                                                     ppm for inhalation
                                                     exposures to TCE as
                                                     an eight-hour TWA
                                                     based on
                                                     immunotoxicity.
Industrial and commercial     Prohibit; includes a  Prohibit; includes a
 use as a solvent for closed-  phaseout of TCE for   TSCA section 6(g)
 loop batch vapor degreasing.  industrial and        exemption for the
                               commercial use as a   industrial and
                               solvent for closed    commercial use as
                               loop batch vapor      solvent for closed-
                               degreasing for        loop batch vapor
                               rayon fabric          degreasing for
                               scouring for end      essential aerospace
                               use rocket booster    use and medical
                               nozzle production     tubing + WCPP
                               by Federal Agencies   includes an ECEL of
                               and their             0.0040 ppm for
                               contractors and a     inhalation
                               TSCA section 6(g)     exposures to TCE as
                               exemption for         an eight-hour TWA
                               industrial and        based on
                               commercial use as a   immunotoxicity.
                               solvent for closed
                               loop batch vapor
                               degreasing
                               necessary for human-
                               rated rocket engine
                               cleaning by NASA
                               and its
                               contractors+ WCPP
                               for one sub-use
                               includes an ECEL of
                               0.0011 ppm for
                               inhalation
                               exposures to TCE as
                               an eight-hour TWA
                               based on
                               developmental
                               toxicity.
Industrial and commercial     Prohibit............  Prohibit.
 use as a solvent for in-
 line conveyorized vapor
 degreasing.
Industrial and commercial     Prohibit............  Prohibit.
 use as a solvent for in-
 line web cleaner vapor
 degreasing.
Industrial and commercial     Prohibit............  Prohibit.
 use as a solvent for cold
 cleaning.
Industrial and commercial     Prohibit............  Prohibit.
 use as a solvent for
 aerosol spray degreaser/
 cleaner and mold release.
Industrial and commercial     Prohibit............  Prohibit.
 use as a lubricant and
 grease in tap and die fluid.
Industrial and commercial     Prohibit............  Prohibit.
 use as a lubricant and
 grease in penetrating
 lubricant.
Industrial and commercial     Prohibit............  Prohibit.
 use as an adhesive and
 sealant in solvent-based
 adhesives and sealants;
 tire repair cement/sealer;
 mirror edge sealant.
Industrial and commercial     Prohibit............  Prohibit.
 use as a functional fluid
 in heat exchange fluid.
Industrial and commercial     Prohibit............  Prohibit.
 use in paints and coatings
 as a diluent in solvent-
 based paints and coatings.
Industrial and commercial     Prohibit............  Prohibit.
 use in cleaning and
 furniture care products in
 carpet cleaner and wipe
 cleaning.
Industrial and commercial     Prohibit............  Prohibit.
 use in laundry and
 dishwashing products in
 spot remover.
Industrial and commercial     Prohibit............  Prohibit.
 use in arts, crafts, and
 hobby materials in
 fixatives and finishing
 spray coatings.
Industrial and commercial     Prohibit............  Prohibit.
 use in corrosion inhibitors
 and anti-scaling agents.
Industrial and commercial     Prohibit; includes a  Prohibit; includes
 use as a processing aid for   TSCA section 6(g)     TSCA section 6(g)
 battery separator             exemption for the     exemptions for the
 manufacturing and for the     industrial and        industrial and
 manufacturing of specialty    commercial use as a   commercial use as a
 polymeric microporous sheet   processing aid for    processing aid for
 materials; process solvent    battery separator     battery separator
 used in polymer fabric        manufacturing +       manufacturing and
 spinning, fluoroelastomer     WCPP includes an      for the
 manufacture and Alcantara     ECEL of 0.0011 ppm    manufacturing of
 manufacture; extraction       for inhalation        specialty polymeric
 solvent used in caprolactam   exposures to TCE as   microporous sheet
 manufacture; precipitant      an eight-hour TWA     materials + WCPP
 used in beta-cyclodextrin     based on              includes an ECEL of
 manufacture.                  developmental         0.0040 ppm for
                               toxicity.             inhalation
                                                     exposures to TCE as
                                                     an eight-hour TWA
                                                     based on
                                                     immunotoxicity.
Industrial and commercial     Prohibit............  Prohibit.
 use as ink, toner and
 colorant products in toner
 aid.
Industrial and commercial     Prohibit............  Prohibit.
 use in automotive care
 products in brake parts
 cleaner.

[[Page 74761]]

 
Industrial and commercial     Prohibit............  Prohibit.
 use in apparel and footwear
 care products in shoe
 polish.
Industrial and commercial     Prohibit; includes a  Prohibit; includes a
 use in hoof polish; gun       TSCA section 6(g)     TSCA section 6(g)
 scrubber; pepper spray;       exemption for the     exemption for the
 other miscellaneous           industrial and        industrial and
 industrial and commercial     commercial use as a   commercial use as a
 uses.                         laboratory chemical   laboratory chemical
                               for essential         for essential
                               laboratory            laboratory
                               activities and some   activities + WCPP
                               research and          includes an ECEL of
                               development           0.0040 ppm for
                               activities + WCPP     inhalation
                               includes an ECEL of   exposures to TCE as
                               0.0011 ppm for        an eight-hour TWA
                               inhalation            based on
                               exposures to TCE as   immunotoxicity.
                               an eight-hour TWA
                               based on
                               developmental
                               toxicity.
Consumer use as a solvent in  Prohibit \2\........  Prohibit.\2\
 brake and parts cleaners.
Consumer use as a solvent in  Prohibit \2\........  Prohibit.\2\
 aerosol electronic
 degreaser/cleaner.
Consumer use as a solvent in  Prohibit \2\........  Prohibit.\2\
 liquid electronic degreaser/
 cleaner.
Consumer use as a solvent in  Prohibit \2\........  Prohibit.\2\
 aerosol spray degreaser/
 cleaner.
Consumer use as a solvent in  Prohibit \2\........  Prohibit.\2\
 liquid degreaser/cleaner.
Consumer use as a solvent in  Prohibit \2\........  Prohibit.\2\
 aerosol gun scrubber.
Consumer use as a solvent in  Prohibit \2\........  Prohibit.\2\
 liquid gun scrubber.
Consumer use as a solvent in  Prohibit \2\........  Prohibit.\2\
 mold release.
Consumer use as a solvent in  Prohibit \2\........  Prohibit.\2\
 aerosol tire cleaner.
Consumer use as a solvent in  Prohibit \2\........  Prohibit.\2\
 liquid tire cleaner.
Consumer use as a lubricant   Prohibit \2\........  Prohibit.\2\
 and grease in tap and die
 fluid.
Consumer use as a lubricant   Prohibit \2\........  Prohibit.\2\
 and grease in penetrating
 lubricant.
Consumer use as an adhesive   Prohibit \2\........  Prohibit.\2\
 and sealant in solvent-
 based adhesives and
 sealants.
Consumer use as an adhesive   Prohibit \2\........  Prohibit.\2\
 and sealant in mirror edge
 sealant.
Consumer use as an adhesive   Prohibit \2\........  Prohibit.\2\
 and sealant in tire repair
 cement/sealer.
Consumer use as a cleaning    Prohibit \2\........  Prohibit.\2\
 and furniture care product
 in carpet cleaner.
Consumer use as a cleaning    Prohibit \2\........  Prohibit.\2\
 and furniture care product
 in aerosol spot remover.
Consumer use as a cleaning    Prohibit \2\........  Prohibit.\2\
 and furniture care product
 in liquid spot remover.
Consumer use in arts,         Prohibit \2\........  Prohibit.\2\
 crafts, and hobby materials
 in fixative and finishing
 spray coatings.
Consumer use in apparel and   Prohibit \2\........  Prohibit.\2\
 footwear products in shoe
 polish.
Consumer use in fabric spray  Prohibit \2\........  Prohibit.\2\
Consumer use in film cleaner  Prohibit \2\........  Prohibit.\2\
Consumer use in hoof polish.  Prohibit \2\........  Prohibit.\2\
Consumer use in toner aid...  Prohibit \2\........  Prohibit.\2\
Disposal to industrial pre-   Prohibit the          Prohibit.
 treatment, industrial         disposal of TCE to
 treatment, or publicly        industrial pre-
 owned treatment works.        treatment,
                               industrial
                               treatment, or
                               publicly owned
                               treatment works;
                               with a TSCA section
                               6(g) exemption for
                               the disposal of TCE
                               from cleanup
                               projects.
------------------------------------------------------------------------
\1\ Does not include exemptions under TSCA section 6(g); for certain
  industrial and commercial uses of TCE for DoD naval vessels and their
  systems, and in the maintenance, fabrication, and sustainment for and
  of such vessels and systems + WCPP, which includes an ECEL of 0.0011
  ppm for inhalation exposures to TCE as an eight-hour TWA based on
  developmental toxicity; or for the emergency industrial and commercial
  use of TCE in furtherance of the NASA mission for specific conditions
  that are critical or essential and for which no technically and
  economically feasible safer alternative is available + WCPP, which
  includes an ECEL of 0.0011 ppm for inhalation exposures to TCE as an
  eight-hour TWA based on developmental toxicity.
\2\ Prohibit manufacture, processing, and distribution in commerce for
  the consumer use.


[[Page 74762]]

VI. Rationale for the Proposed Regulatory Action and Primary 
Alternative Regulatory Action

    This unit describes how the considerations described in Unit 
III.B.3. were applied when selecting among the TSCA section 6(a) 
requirements to arrive at the proposed and primary alternative 
regulatory actions described in Unit V.

A. Consideration of Risk Management Requirements Available Under TSCA 
Section 6(a)

1. Proposed Regulatory Action
a. Prohibition
    EPA considered a prohibition as a regulatory option and is 
proposing it for all manufacturing (including import), processing, 
distribution in commerce, use, and certain types of disposal of TCE 
(Unit V.A.). EPA proposes that prohibition is necessary to address the 
unreasonable risk for all occupational conditions of use after taking 
into consideration other combinations of controls such as a non-
prescriptive WCPP or prescriptive controls (i.e., engineering controls, 
administrative controls, and PPE). As described in Unit V.A., EPA's 
bases for the need for this regulatory approach are similar to those 
for the Agency's determination of unreasonable risk, and include 
severity of the hazard, exposed populations, magnitude of risk, and 
uncertainties (Ref. 2). Throughout this proposed rule, EPA has 
described the severity of the hazard of TCE (including immunotoxicity, 
developmental, and cancer risks), based on the 2020 Risk Evaluation for 
TCE, as well as the populations exposed to the 52 conditions of use 
that drive the unreasonable risk, which include numerous workers, ONUs, 
consumers, and bystanders, including PESS such as workers of 
reproductive age (in particular, older pregnant women).
    The significance of the magnitude of exposures for TCE is 
highlighted when considering the margins of exposure (MOEs, or the 
health point of departure for an endpoint divided by the exposure 
concentration) in the risk evaluation that estimate non-cancer risk for 
acute and chronic exposure. Estimated MOEs are compared to a benchmark, 
described in more detail in the risk evaluation, as part of the 
unreasonable risk determination (Refs. 1, 2). An MOE lower than the 
benchmark supports a determination of unreasonable risk of injury to 
health, based on noncancer effects. As an example, for commercial use 
of TCE in open top vapor degreasing, the chronic MOE for fetal cardiac 
defects is 0.0006, which is several orders of magnitude lower than then 
benchmark of 10. Even with engineering controls, the only way to reduce 
exposures more than 1,000-fold would be PPE with an APF of 10,000 (Ref. 
1). This level of APF would require workers to constantly wear a full-
face self-contained breathing apparatus (SCBA) in pressure demand mode 
or other positive pressure mode, which is considered unsustainable for 
the long-term and the least preferred approach to worker protection in 
the hierarchy of controls. There are many documented limitations to 
successful implementation of respirators with an APF of 10,000, 
including difficulties in fit and use rendering them ineffective in 
actual application, preventing the assurance of consistent and reliable 
protection, regardless of the assigned capabilities of the respirator 
(Refs. 69, 70) (63 FR 1152, January 8, 1998). EPA requests comments on 
subsections of conditions of use, which by nature of their infrequent 
occurrence, could meet the ECEL without having their employees wear 
high APF levels of PPE on a daily basis. Given that the magnitude of 
risk from TCE is so high, and that the extremely high level of PPE 
would be an ineffective long-term way of addressing that risk along 
with information provided by stakeholders, including during 
consultations (Refs. 70, 31), EPA has significant uncertainty that any 
measures short of prohibition would be sufficient to address the 
unreasonable risk. Therefore, EPA proposes that prohibition is the 
preferred option to ultimately address unreasonable risk. EPA believes 
that the extremely low ppm level of the ECEL, while fully addressing 
unreasonable risk, will be infeasible for industry to reliably meet due 
to the need for a combination of engineering, administrative controls, 
and full-face, self-contained, air-supplied respirators. As such, the 
only way to protect human health consistently, reliably, and 
continually from unreasonable risk would be to prohibit TCE.
    Ultimately, a prohibition would result in elimination of 
unreasonable risk from TCE, rather than allowing TCE use to continue in 
perpetuity, which would necessitate burdensome requirements to achieve 
exposure reductions to implement a technically challenging long-term 
program to meet a very low exposure limit. Recognizing that longer 
compliance timeframes and TSCA section 6(g) time-limited exemptions 
would nevertheless be necessary for certain critical uses to continue 
for a period of time as, described previously in Units V.A.1.d., 
V.A.1.e., and V.A.1.f., it is necessary to protect workers, including 
PESS, such as older pregnant workers and ONUs (the group identified as 
most susceptible to fetal cardiac defects). Therefore, as described in 
Unit IV., EPA is proposing the WCPP ECEL of 0.0011 ppm, based on the 
fetal cardiac defects endpoint, so that the developing fetus is best 
protected. EPA's primary alternative regulatory option bases the WCPP 
ECEL for TCE on the immunotoxicity endpoint. Because it would not be as 
protective for the subset of PESS that include older pregnant workers 
and ONUs as specific under TSCA section 6(b), the ECEL based on 
immunotoxicity was not put forth as the proposed ECEL. In other words, 
under the immunotoxicity ECEL of 0.0040 ppm, workers and ONUs would be 
protected from immunosuppression resulting from an acute (eight-hour) 
exposure, and from an excess risk of cancer resulting from lifetime 
exposure, as well as other adverse health effects such as reproductive 
toxicity, liver toxicity, kidney toxicity, and neurotoxicity. When the 
ECEL of 0.0011 ppm based on fetal cardiac defects is used, EPA expects 
that a fetus would be protected from the effects of maternal exposure 
by workers and ONUs, in addition to the protections noted previously. 
Given this gap in protectiveness, the immunotoxicity ECEL of 0.0040 ppm 
is being considered as the alternative regulatory option rather than 
the proposed approach. As noted in Unit V.A.2., EPA has significant 
uncertainty about the extent to which some members of the regulated 
community could measure or reliably meet either the ECEL of 0.0011 ppm 
(in the proposed WCPP) or the ECEL of 0.0040 ppm (in the primary 
alternative regulatory action), which contributes to EPA's proposal 
that prohibition is the best long-term risk management option for TCE.
    EPA understands that additional time may be necessary for certain 
processing and industrial and commercial conditions of use to achieve a 
full prohibition, including the need for upstream manufacturing, 
processing, and distribution in commerce for those uses to continue to 
ensure availability for the supply chain. In particular, EPA recognizes 
that processing TCE as a reactant/intermediate often takes place in 
unique closed-systems, and facilities processing TCE may need 
additional time to transition to adjust the physical plant design to 
accommodate an alternative manufacturing process or chemical substance 
and avoid significantly disrupting the supply

[[Page 74763]]

chain. For example, EPA understands that the manufacturing (including 
import) and processing of TCE as an intermediate for the manufacture of 
HFC-134a is expected to phase down (absent a TSCA prohibition) over 
time as users move to more climate-friendly alternatives under the 
requirements of the AIM Act. In this instance, EPA is proposing 
requirements as part of a WCPP to reduce the worker exposures to TCE 
until the prohibition compliance date. In addition, EPA recognizes that 
industrial and commercial use of TCE as a solvent for closed-loop batch 
vapor degreasing for rayon fabric scouring for end use in rocket 
booster nozzle production by Federal agencies and their contractors is 
a highly specific use with a uniquely long qualification process for 
alternatives. In the production of booster rocket nozzles, TCE is used 
in vapor degreasing as a solvent in rayon fabric sourcing, an intensive 
cleaning process to remove contaminants. This rayon fabric is then 
carbonized as part of an ablative process in the nozzle production and 
used to line the inside of the nozzles on booster rockets (Ref. 43). 
Cleaning is a critical step of this process; if contaminants are not 
sufficiently removed in the scouring stage, the fabric will be degraded 
during the chemical reaction that occurs during carbonization, which 
could result in failure of the nozzle during a launch and catastrophic 
effects for the rockets.
    For this use, NASA has presented information to EPA on the 
necessity of additional time to transition to an alternative, given 
that 8 rocket launches are planned using booster sets with a component 
produced with TCE (Ref. 43). These launches could not occur if 
prohibition occurred on a shorter timeframe. In particular, given the 
end use of the components in human-rated spaceflight, EPA recognizes 
that NASA must conduct an array of tests to qualify an alternative 
solvent to TCE, including a variety of booster rocket function tests 
culminating in a full-scale static motor test. Even if an alternative 
were identified and qualified through a successful testing cycle, 
additional time would be needed for updates to workflows and production 
of new booster nozzles (Ref. 43). As such, EPA has provided additional 
time for the industrial and commercial use as a solvent for closed-loop 
batch vapor degreasing for rayon fabric scouring for end use in rocket 
booster nozzle production by Federal agencies and their contractors. 
EPA recognizes that other Federal agencies may also rely on rayon 
fabric scouring for their rocket booster nozzle production and so 
proposes that the phaseout for this sub-set of the industrial and 
commercial use of TCE as a solvent in closed-loop batch vapor 
degreasing apply to Federal agencies generally and their contractors. 
As a condition for the phaseout, EPA has specified that a final pre-
launch test of rocket booster nozzles without using TCE must be 
conducted within 5 years, with a full prohibition in 10 years on the 
use of TCE in scouring rayon fabric for end use in nozzles in rocket 
boosters. For this phaseout period, EPA is proposing requirements as 
part of a WCPP to reduce the worker exposures to TCE until the 
prohibition compliance date, and Unit V.A.2. explains that the 
establishment of a WCPP is intended to allow more flexibility to 
regulated entities than requiring specific prescriptive controls. 
Similarly, EPA is proposing the WCPP to reduce to the extent possible 
the unreasonable risk until the prohibition compliance date for certain 
conditions of use that would be permitted to continue for longer than a 
year after publication of the final rule, as discussed in Unit V.A.
    Additionally, prohibition is the preferred option for occupational 
conditions of use where reasonably available information suggests 
minimal ongoing use or when feasible safer alternatives are reasonably 
available. As described in this unit, EPA is highly uncertain as to 
whether users could comply with the requirements of a TCE WCPP, and EPA 
is also concerned with the severity of the risks of TCE. EPA notes the 
prevalence of alternative processes and products (Unit VI.B.). In some 
cases, reasonably available information indicating a use is no longer 
ongoing (Refs. 71, 3), has led EPA to propose more immediate 
prohibitions for most industrial and commercial uses of TCE, including 
the upstream manufacturing, processing, and distribution in commerce 
for those uses. EPA requests public comment on the rationale for 
proposing prohibitions as the preferred risk management approach. In 
addition, EPA requests comment regarding the number of businesses and 
other entities that could potentially close as well as associated costs 
with a prohibition of TCE for the industrial and commercial conditions 
of use identified in Unit V.A.1.
    TSCA section 6(a)(2) provides EPA with the authority to prohibit or 
otherwise restrict the manufacture (including import), processing, or 
distribution in commerce of a substance or mixture ``for a particular 
use'' to ensure that a chemical substance no longer presents 
unreasonable risk. For this rulemaking, EPA proposes that ``for a 
particular use'' include consumer use, which encompasses all known, 
intended, and reasonably foreseen consumer uses for TCE (Ref. 1). Given 
the severity and ubiquitous nature of the risks identified in the 2020 
Risk Evaluation for TCE for processing of TCE into formulation as well 
as for all but one consumer use (pepper spray) and, noting that those 
conditions of use encompass all known, intended, and reasonably 
foreseen consumer use, EPA proposes that prohibiting manufacture 
(including importing), processing, and distribution in commerce of TCE 
for consumer use is reasonable and necessary to address the 
unreasonable risk from TCE driven by manufacturing (including 
importing) and processing TCE into formulation (the upstream conditions 
of use for products intended for consumer use), and that this proposed 
approach will also address the unreasonable risk to consumers and 
bystanders. Furthermore, amongst the broad prohibition of TCE, EPA 
considered and acknowledges the likely future unavailability of TCE for 
the consumer use of pepper spray, and EPA expects the prohibition on 
industrial and commercial use of TCE in pepper spray, as well as the 
upstream prohibition on manufacturing, processing, and distribution of 
TCE for commercial or consumer uses, would result in no TCE-containing 
pepper spray being produced for consumer use (Ref. 71).
    Details of the proposed prohibitions are described in more detail 
in Unit V.A.
b. Workplace Chemical Protection Program (WCPP)
    i. Overall. Prohibition is the preferred option for all 
occupational COUs, because significant uncertainty exists relative to 
any sector's ability to comply with a notably low exposure limit for 
TCE, particularly given the magnitude of exposure for many conditions 
of use (see Unit V.A.1.). A more immediate prohibition is the preferred 
option for occupational conditions of use where greater uncertainty 
exists relative to a sector's ability to comply with provisions of a 
WCPP, in particular a very low ECEL, as well as additional requirements 
that would support implementation of these restrictions (described in 
Unit V.A.2.). The 8-hour TWA ECEL of 0.0011 ppm for TCE that EPA is 
proposing, based on the developmental toxicity endpoint, is 
significantly lower than the OSHA PEL of 100 ppm, and there is a high 
degree of uncertainty as to whether users under the conditions of use 
in any sector would be able to comply with such a level and, thus, 
whether the

[[Page 74764]]

unreasonable risk would be addressed. However, to address, to the 
extent possible, the unreasonable risk during the time period before a 
prohibition would become effective, EPA is proposing a WCPP until the 
prohibition compliance date. The WCPP would include a combination of 
restrictions to reduce the unreasonable risk from TCE driven by 
inhalation and dermal exposures in the workplace until the prohibition 
compliance date and is proposed only for certain conditions of use. EPA 
requests public comment related to the ability of regulated entities to 
meet the ECEL of 0.0011 ppm, and whether EPA should prescribe mandatory 
restrictions and PPE levels.
    ii. Existing Chemical Exposure Limit. One requirement considered by 
EPA to include in a TCE WCPP to reduce the unreasonable risk driven by 
inhalation exposures to TCE for occupational conditions of use was 
establishing an ECEL and related implementation measures, such as 
exposure monitoring, until the prohibition compliance date. As 
described in Unit V.A., the TCE WCPP would be non-prescriptive, in the 
sense that regulated entities would not be required to use specific 
controls prescribed by EPA to achieve the exposure concentration limit. 
Rather, it would be a performance-based exposure limit that would 
enable owners or operators to determine how to most effectively put 
measures in place to reduce the exposure to TCE based on conditions at 
their workplace, consistent with the hierarchy of controls.
    A central component of the TCE WCPP is the exposure limit. 
Exposures remaining at or below the ECEL would address any unreasonable 
risk of injury to health driven by inhalation exposures for 
occupational conditions of use. In the case of TCE, EPA has calculated 
the ECEL to be 0.0011 parts per million (ppm) (0.0059 mg/m\3\) for 
inhalation exposures as an 8-hour TWA in workplace settings, based on 
the most sensitive acute non-cancer occupational HEC for fetal cardiac 
defects (Ref. 13). The differences between the ECEL and the OSHA PEL 
are discussed in more detail in Unit II.C.1.b. EPA chose the acute non-
cancer developmental toxicity endpoint for TCE as the basis for the 
exposure limit for the proposed regulatory action as it is the most 
sensitive endpoint and, therefore, would be protective of both acute 
and chronic non-cancer as well as cancer inhalation endpoints over the 
course of a working day and lifetime, including for potentially exposed 
or susceptible subpopulations (additional explanation is in Unit 
VI.A.). However, as discussed in Unit V.A.2., EPA expects that 
detection of and adherence to extremely low-ppm levels of TCE may 
present challenges to the regulated community (Ref. 45), and so EPA is 
proposing the WCPP until the prohibition compliance date. EPA 
emphasizes the time limited nature of this WCPP, due to the likely need 
for reliance on air-supplied respirators of APF 1,000 or 10,000 that 
would be needed to address the unreasonable risk, even when engineering 
and administrative controls are put into place. More details are 
provided later in this unit.
    iii. Dermal protection. As part of the WCPP, EPA is proposing to 
require use and provision of chemically resistant gloves by potentially 
exposed persons in combination with specific activity training (e.g., 
appropriate procedures for glove removal, replacement, and disposal) 
for tasks where dermal exposure can be expected to occur. However, EPA 
understands these tasks are expected to occur for conditions of use, 
such as processing TCE as a reactant, where closed system processes are 
already in place to minimize exposure to TCE. EPA is not proposing to 
require owners or operators to document consideration of the hierarchy 
of controls for dermal exposures to TCE because EPA intends to prohibit 
all uses of TCE, EPA is proposing relatively rapid compliance dates for 
the prohibitions for most uses of TCE, and dermal PPE programs are 
somewhat more straightforward to implement than respiratory PPE 
programs. In proposing dermal requirements, EPA took into consideration 
the volatile nature of TCE because the dermal absorption of TCE depends 
on the type and duration of exposure. For the conditions of use that 
would be subject to the WCPP, EPA also considered the unique, closed 
system processes of each use which aid to reduce dermal exposure.
    iv. WCPP considerations. EPA is proposing a WCPP for several 
conditions of use of TCE to reduce the unreasonable risk to the extent 
possible during the time period before a prohibition becomes effective, 
described in Unit V.A.2.
    In deciding whether an ECEL and related required measures would 
appropriately reduce the unreasonable risk driven by occupational 
inhalation exposures, EPA considered factors related to work activities 
that may make it difficult to comply with an ECEL, particularly at the 
low air concentration level EPA has identified. Once EPA identified the 
appropriate risk-based inhalation limit to reduce identified 
unreasonable risk, EPA carefully considered the appropriateness of such 
an exposure control program for each occupational condition of use of 
TCE, in the context of the unreasonable risk. Examples include 
conditions of use with work activities that may take place in the 
field, making it challenging to establish a regulated area and conduct 
monitoring; work activities that may take place in open systems that 
require manual contact with the chemical substance; work activities 
that may take place in small, enclosed spaces, creating challenges for 
implementing engineering controls or using respiratory PPE; work 
activities that require a high range of motion or for some other reason 
create challenges for the implementation of respiratory PPE; and the 
type of PPE that would be needed under the TCE WCPP to meet the ECEL in 
the absence of, or in addition to, other feasible exposure controls, 
based on analysis in the 2020 Risk Evaluation for TCE describing 
expected exposures with and without use of PPE.
    EPA also considered the feasibility of exposure reduction 
sufficient to reduce the unreasonable risk, including in facilities 
currently complying with the OSHA PEL for TCE or implementing other 
recommended OELs such as the ACGIH TLV. While EPA acknowledges the 
regulated community's expected familiarity with OSHA PELs generally, as 
well as facilities' past and ongoing actions to implement the TCE PEL, 
the value of EPA's exposure limit is almost five orders of magnitude 
lower than the OSHA PEL. (The differences between the ECEL and the OSHA 
PEL are discussed in more detail in Unit II.C.4.) This creates a 
significant degree of uncertainty as to whether facilities engaging in 
most conditions of use could implement engineering or administrative 
controls to reduce exposures in a manner aligned with the hierarchy of 
controls to meet the ECEL (and associated action level) and whether 
they could do so without relying primarily on the use of PPE (which is 
the least preferred option in the hierarchy of controls) to supplement 
exposure reduction efforts.
    EPA understands that this uncertainty extends to the feasibility of 
respirators as a long-term risk management practice as well, since the 
complexity and burden of wearing respirators increases with increasing 
APF. Although respirators, specifically SCBAs (APF 10,000), could 
reduce exposures to levels that protect against non-cancer and cancer 
risks, not all workers may be able to wear respirators. Individuals 
with impaired lung function due to asthma, emphysema, or chronic 
obstructive pulmonary disease, for

[[Page 74765]]

example, may be physically unable to wear a respirator. OSHA requires 
that a determination regarding the ability to use a respirator be made 
by a physician or other licensed health-care professional, and annual 
fit testing is required for tight-fitting, full-face piece respirators 
to provide the required protection. Individuals with facial hair, such 
as beards or sideburns that interfere with a proper face-to-respirator 
seal, cannot wear tight fitting respirators. In addition, respirators 
may also present communication problems, vision problems, worker 
fatigue, and reduced work efficiency (63 FR 1152, January 8, 1998). 
According to OSHA, ``improperly selected respirators may afford no 
protection at all (for example, use of a dust mask against airborne 
vapors), may be so uncomfortable as to be intolerable to the wearer, or 
may hinder vision, communication, hearing, or movement and thus pose a 
risk to the wearer's safety or health.'' (63 FR 1189 through 1190). 
Furthermore, depending on the air concentrations and proximity to the 
regulated area, other employees in the area may also need to wear 
respiratory PPE. EPA understands, based on reasonably available 
information, that occupational exposures tend to fluctuate depending on 
the task being performed and the frequency of the task, which could 
create challenges for reliably effective implementation of respiratory 
PPE (Refs. 70, 72, 35).
    EPA reviewed reasonably available information, including monitoring 
data, and information related to considerations described previously in 
this unit. EPA expects attempts to implement the WCPP to include 
increased monitoring and that industry would likely need to exclusively 
rely on PPE when aiming to reach the ECEL, including the use of high 
APF respirators, such as fit-tested, air-supplied respirators of APF 
1,000 or APF 10,000. Given the high APF of respirators that are likely 
needed to reach the ECEL, EPA recognizes that this equipment and its 
programmatic maintenance could be highly burdensome. EPA believes this 
could create implementation challenges and is not a long-term, 
sustainable use of the WCPP. The WCPP would be in place for a 
relatively short period of time (less than 10 years for the vast 
majority of production value) until the eventual prohibition, because 
of the likely need for such extensive PPE. The ultimate goal for TCE is 
prohibition given the difficulty of maintaining a WCPP long term.
    One of the conditions of use for which EPA is proposing a WCPP 
until the prohibition goes into effect is processing TCE as a reactant/
intermediate. The majority of the annual production volume of TCE 
processed as an intermediate under this condition of use goes almost 
entirely toward the manufacture of one HFC, HFC-134a (Refs. 3, 70, 73). 
Monitoring information submitted by facilities processing TCE as an 
intermediate to manufacture HFC-134a suggests that TCE is largely 
confined to the process reactors, which require infrequent loading and 
unloading activities taking place approximately 20 times per year and 
resulting in low-ppm TCE exposure levels (Ref. 70). The information 
submitted also highlights that TCE is consumed and transformed during 
the reaction process (Ref. 70). Additionally, HFC-134a is one of the 
regulated substances that are subject to a phasedown under the AIM Act, 
and as discussed in Unit I.D., EPA understands that HFC-134a has a 
lower GWP compared to other refrigerants, which will likely continue to 
be used to facilitate the transition from certain other HFCs pursuant 
to the phasedown under the AIM Act. Providing a longer phaseout under 
TSCA for processing TCE as an intermediate for the manufacture of HFC-
134a, while subject to a WCPP, is consistent with the agency's efforts 
to address climate-damaging HFCs, such as HFC-134a, under the AIM Act. 
EPA is seeking comment on the actions that manufacturers who process 
TCE for the production of HFC-134a would take as a result of this 
proposed phaseout and whether this would motivate a decision to cease 
manufacture earlier than they would otherwise under the AIM Act phase-
down. For the remaining volume of TCE processed as a reactant/
intermediate for chemical synthesis other than manufacturing HFC-134a, 
additional time may be necessary to reconfigure or otherwise adjust the 
physical plant to accommodate an alternative manufacturing process, so 
a WCPP is also associated with the prohibition of other processing as a 
reactant/intermediate uses; however, the phaseout does not apply to the 
other uses for which EPA is proposing a more immediate prohibition 
discussed in Unit V.A.
    Additionally, EPA considered other industrial and commercial uses 
as candidates for a WCPP. Similar to the processing of TCE as a 
reactant/intermediate, unique, closed-system processes exist for the 
industrial and commercial use as: processing aid in process solvent 
used in battery manufacture; a process solvent used in polymer fiber 
spinning, fluoroelastomer manufacture and Alcantara manufacture; an 
extraction solvent used in caprolactam manufacture; and a precipitant 
used in beta-cyclodextrin manufacture. Where TCE is used as a 
processing aid, TCE is consumed or captured and reused in the process. 
Monitoring data suggests low-ppm TCE exposure levels but may involve 
daily worker tasks. EPA understands that some of the industrial and 
commercial uses of TCE as a processing aid occur outside of the U.S., 
or may no longer be ongoing in the U.S. However, EPA received and 
reviewed substantive information from the battery separator 
manufacturing industry, specifically for lead-acid and lithium-ion 
battery separator manufacturing processes, along with a request for a 
TSCA section 6(g) exemption under this TSCA rulemaking. EPA agrees that 
battery separator manufacturing is critical to the national economy and 
national security; therefore, EPA is proposing to grant a 10-year 
exemption from the prohibition for the industrial and commercial use of 
TCE as a processing aid for battery separator manufacturing. For this 
exemption EPA is proposing to impose the WCPP requirements as a 
condition for the TSCA section 6(g) exemption. All other industrial and 
commercial processing aid uses (e.g., process solvent used in polymer 
fabric spinning, fluoroelastomer manufacture, etc.) must comply with 
the more stringent prohibition detailed in Unit V.A.
    Furthermore, EPA considered industrial and commercial uses of TCE 
as an essential laboratory chemical as necessary to continue following 
the WCPP requirements, during the period of the TSCA section 6(g) time-
limited exemption described in Unit V.A. Industrial and commercial use 
as a laboratory chemical is necessary to provide for the analysis of 
monitoring samples required to implement the ECEL requirements under 
the WCPP as part of this proposed regulation, as well as for essential 
chemical analysis, including for ongoing cleanup projects that fall 
under the Superfund program or other EPA jurisdictions, described in 
Unit V.A.3. Furthermore, EPA expects laboratory settings to be more 
conducive to the implementation of engineering controls such as fume 
hoods to ventilate vapors and reduce overall exposure to TCE in 
alignment with the hierarchy of controls.
    Lastly, for TCE to be available for the downstream uses described 
in this unit, it must be manufactured (including imported), processed, 
and distributed in commerce. Therefore, as discussed in Unit V.A., EPA 
is proposing the WCPP

[[Page 74766]]

for manufacturing (including importing) and processing for certain 
industrial and commercial uses, to allow a continuous supply chain for 
the specified conditions of use expected to continue 1 year after the 
final rule is published until the prohibition compliance dates.
2. Primary Alternative Regulatory Action
    EPA acknowledges that, for some conditions of use that it is 
proposing to prohibit, there may be some activities or facilities that 
need longer compliance timeframes in order to appropriately transition. 
Therefore, the primary alternative regulatory action accounts for 
additional time under a prohibition to provide the flexibility for 
facilities to comply, for example, to account for issues in the supply 
chain, such as the availability of alternatives to reformulate 
products. In selecting among the TSCA section 6(a) requirements for the 
primary alternative regulatory action for use of TCE-containing 
products, EPA considered risk-related factors, including but not 
limited to, the population exposed and the severity of the hazard of 
TCE and, separately, of other alternative solvents, which are 
undergoing risk evaluation and risk management under TSCA section 6, 
such as PCE (as part of a separate rulemaking under RIN 2070-AK84). For 
example, there may be instances where PCE and TCE may be desired 
because they are non-flammable solvents used as cleaning agents for 
energized electrical equipment (e.g., circuit boards). In these 
instances, additional time may be needed to identify an alternative 
chemical or process to avoid flammability concerns.
    EPA also considered a TSCA section 6(g) time-limited exemption for 
additional conditions of use that are critical or essential, or where a 
prohibition could have significant impacts on the national economy, 
national security, and infrastructure As described in Unit V.B.3.a.ii., 
EPA requests comments on a TSCA section 6(g) exemption, and based on 
the information received may find that an exemption may be warranted 
under the primary alternative regulatory action for the industrial and 
commercial use of TCE in batch vapor degreasing for critical aerospace 
or medical device applications, if the workplaces engaged in that 
condition of use cannot meet the requirements of the proposed 
regulatory action.
    Similar to the proposed regulatory action, the primary alternative 
regulatory action would include a WCPP for several conditions of use of 
TCE to reduce to the extent possible the unreasonable risk during the 
time period before a prohibition becomes effective, including as a 
condition to the TSCA section 6(g) exemption, per TSCA section 6(g)(4). 
For the implementation of the TCE WCPP, EPA considered providing 
additional time under the primary alternative regulatory action for the 
WCPP requirements given the difference in order of magnitude for the 
exposure limit under TSCA compared to levels required by OSHA or other 
recommended guidelines. These provisions would include, for instance, 
identifying appropriate monitoring methods to comply with an TSCA 
exposure limit that is five orders of magnitude lower than the OSHA PEL 
(i.e., 0.0040 ppm vs. 100 ppm, respectively), as well as providing for 
respiratory protection corresponding to a higher assigned protection 
factor than required by OSHA, further described in Unit II.C.
    Further, the WCPP under the primary alternative regulatory action 
would include an ECEL of 0.0040 ppm to address inhalation exposures to 
TCE in occupational settings that is based on the immunotoxicity 
endpoint. EPA believes that this ECEL would be less protective than the 
ECEL of 0.0011 ppm based on the developmental toxicity endpoint, that 
EPA would require under the proposed regulatory action. (A summary of 
EPA's risk evaluation activities under TSCA is provided in Unit II.D., 
and the health effects of TCE, including the difference in the two 
human health endpoints as the basis for the two different ECELs, are 
discussed in Unit VI.A.) EPA considered the extremely low-ppm values of 
both ECELs and acknowledges the uncertainties regarding the ability of 
traditional industrial hygiene methods to meet the limit of detection 
associated with either ECEL action level, and the feasibility of 
combining existing engineering and administrative controls to reduce 
the exposure of TCE to extremely low-ppm levels before relying on PPE. 
Therefore, EPA does not consider long-term implementation of the WCPP a 
feasible means of addressing unreasonable risk indefinitely; as such, 
prohibition of the affected conditions of use is ultimately necessary 
to address the unreasonable risk under both the proposed and primary 
alternative regulatory actions.
    The primary alternative regulatory action is described in more 
detail in Unit V.B.
3. Risk Management Requirements Considered But Not Proposed
    EPA considered but is not proposing to regulate the weight fraction 
of TCE in products for industrial and commercial or consumer use 
because TCE is the main constituent (e.g., cleaning component) of the 
majority of TCE-containing product formulations and EPA understands 
that decreasing the concentration of TCE decreases the efficacy of the 
product (Refs. 74, 75).
    EPA also examined the extent to which a self-certification and 
limited-access program restricting TCE use to trained and licensed 
users could ensure that only certain workers employed by a facility 
would be able to purchase and subsequently use TCE. Under a limited 
access program such as a point-of-sale self-certification, entities 
would submit a self-certification to the distributor at the point of 
purchasing the products. The self-certification could consist of a 
statement indicating that the facility is implementing the required 
workplace safety measures to control exposures to TCE. However, a 
point-of-sale self-certification is not a viable option for this 
proposed rulemaking. Given the eventual full prohibition of TCE and the 
significant investments users may have to make toward establishing a 
WCPP, EPA does not believe it would be practicable to add an additional 
burden of implementing a limited access program. Therefore, EPA is not 
proposing a self-certification and limited access program as part of 
this rulemaking. EPA requests comment on the effectiveness of a limited 
access program, such as a point-of-sale self-certification or other 
administrative controls, to address the unreasonable risk of TCE, in 
particular for facilities with occupational exposures to TCE that may 
not be able to meet the WCPP requirements of this proposed rulemaking.
    Another option that EPA considered was requiring prescribed 
engineering controls, administrative controls, or personal protective 
equipment to reduce exposures to TCE in occupational settings. 
Prescriptive requirements would be supported by information in the 2020 
Risk Evaluation for TCE. However, as described in Unit III.A.1. and 2., 
EPA received input during required consultations and additional 
stakeholder engagement that regulatory options that align with the 
hierarchy of controls (i.e., elimination and substitution of hazards in 
the workplace) should be preferred over prescriptive controls (which 
alternatively could be accomplished through the implementation of a 
WCPP with a risk-based exposure limit) (Refs. 12, 31). Inadequacy of 
engineering, administrative, and personal protective equipment control 
measures to lower exposure below the exposure limit

[[Page 74767]]

would mean that elimination or substitution would be the only viable 
methods of addressing unreasonable risk. Additionally, the WCPP 
approach EPA is considering under the proposed action is a more 
flexible approach as prescriptive controls present significant 
uncertainties related to their feasibility, given the site-specific 
operations and variable configurations, and need for consistency of 
proper use.
    EPA determined that such controls (i.e., engineering or 
administrative controls, or PPE) may not be able to eliminate 
unreasonable risk for some conditions of use when used in isolation. In 
the 2020 Risk Evaluation for TCE, many conditions of use still drive 
unreasonable risk even with the application of air-supplied APF 50 
respirators (Ref. 1). Reasonably available data indicated additional 
uncertainty regarding the feasibility of exposure reductions through 
engineering controls alone, considering the unique closed-system 
processes already in place (Refs. 70, 48). For occupational conditions 
of use, prohibitions (rather than prescribed controls) would be more 
appropriate to ensure the elimination of unreasonable risk of TCE. 
Nevertheless, EPA determined that a WCPP, including requirements for an 
ECEL (which would be accompanied by monitoring requirements) in tandem 
with the implementation of engineering controls, administrative 
controls, and/or PPE, as appropriate, would be necessary for reducing 
exposures to TCE prior to the proposed prohibition compliance dates.
4. Additional Considerations
    After considering the different regulatory options under TSCA 
section 6(a), alternatives (described in Unit V.B.), compliance dates, 
and other requirements under TSCA section 6(c), EPA developed the 
proposed regulatory action described in Unit V.A. to address the 
unreasonable risk from TCE so that it is no longer unreasonable. To 
ensure successful implementation of this proposed regulatory action, 
EPA considered other requirements to support compliance with the 
proposed regulations, such as requiring monitoring and recordkeeping to 
demonstrate compliance with a WCPP and downstream notification 
regarding the prohibition on manufacturing (including import), 
processing, and distribution in commerce of TCE, and products 
containing TCE, for industrial and commercial use as well as consumer 
uses. These proposed requirements are described in Unit V.A.
    As required under TSCA section 6(d), any rule under TSCA section 
6(a) must specify mandatory compliance dates, which shall be as soon as 
practicable with a reasonable transition period, but no later than 5 
years after the date of promulgation of the rule (except in the case of 
a use exempted under TSCA section 6(g) or for full implementation of 
ban or phaseout requirements). These compliance dates are detailed in 
Units V.A. and V.B. EPA may finalize significantly shorter or longer 
compliance timeframes based on consideration of public comments.

B. Consideration of Alternatives in Deciding Whether To Prohibit or 
Substantially Restrict TCE

    Under TSCA section 6(c)(2)(C), in deciding whether to prohibit or 
restrict in a manner that substantially prevents a specific condition 
of use of a chemical substance or mixture, and in setting an 
appropriate transition period for such action, EPA must consider, to 
the extent practicable, whether technically and economically feasible 
alternatives that benefit human health or the environment, compared to 
the use so proposed to be prohibited or restricted, will be reasonably 
available as a substitute when the proposed prohibition or other 
restriction takes effect. To that end, in addition to an Economic 
Analysis (Ref. 3), EPA conducted an Alternatives Assessment, using 
reasonably available information (Ref. 71).
    For this assessment, EPA identified and analyzed alternatives to 
TCE in products relevant to industrial, commercial, and consumer 
conditions of use proposed to be prohibited or restricted. Based on 
reasonably available information, including information submitted by 
industry, EPA understands viable alternatives to TCE may not be 
available for several conditions of use, for example, processing TCE as 
an intermediate for the manufacture of HFC-134a, and considered that 
information to the extent practicable in the development of the 
regulatory options as described in Unit III.B.3. For some conditions of 
use, EPA was unable to identify products currently available for sale 
that contain TCE. EPA is soliciting comments on whether there are 
products in use or available for sale relevant to these conditions of 
use that contain TCE at this time, so that EPA can ascertain whether 
there are alternatives that benefit human health or the environment as 
compared to such use of TCE. These conditions of use are detailed in 
the Alternatives Assessment (Ref. 71).
    For conditions of use for which products currently containing TCE 
were identified, EPA identified several hundred commercially available 
alternative products that do not contain TCE, and listed in the 
Alternatives Assessment, to the extent practicable, their unique 
chemical components, or ingredients. For each of these chemical 
components or ingredients, EPA identified whether it functionally 
replaced TCE for the product use and screened product ingredients for 
human health and environmental hazard, as well as identified 
flammability and global warming potential where information was 
reasonably available (Ref. 71). EPA then assigned a rating to the human 
health and environmental hazards, using a methodology described in the 
Alternatives Assessment document. In general, EPA identified products 
containing ingredients with a lower hazard screening rating than TCE 
for certain endpoints, while some ingredients presented higher hazard 
screening ratings than TCE (Ref. 71). These alternative hazard 
screening ratings are described in detail in the Alternatives 
Assessment grouped under common product use categories (Ref. 71).
    Discussion of alternatives to TCE was discussed during the SBAR 
Panel process outreach meetings. EPA's consideration of alternatives 
was informed by the information provided by SERs, which included known 
problems and risks with several available alternatives, such as 
flammability, toxicity, and water limitations due to drought. 
Specifically, SERs discussed how some chlorinated solvents are 
currently undergoing TSCA risk evaluations, while other alternatives 
may be labeled as severe fire hazards by the National Fire Protection 
Association. SERs also mentioned that in the automotive and aerospace 
industries, alternative solvent degreasers may have their own hazard 
profile, which can include flammability, lower boiling temperatures, 
and toxicity (Ref. 32). SERs expressed concern for future regulation of 
chemicals undergoing risk evaluation, and also described the challenges 
of alternative processes, such as aqueous methods. Specifically, SERs 
described how in certain regions it is difficult to justify 
installation of these systems due to limited space or water 
availability. One SER provided an account about one of their customers, 
who had an aqueous cleaning system installed and was unable to source 
the required amount of water to run it. EPA notes the concerns 
expressed by SERs regarding availability of feasible alternatives that 
could be subject to market forces that may impact availability of 
alternatives (e.g., certain fluorinated chemicals) or potentially be

[[Page 74768]]

subject to future EPA regulations. EPA notes that SERs described how 
available alternatives for lubricants in spray applications are mostly 
fluorinated organic compounds; although non-fluorinated options may 
exist, the SERs expressed concern for future potential regulatory 
activity. A trade organization SER highlighted that some fluorinated 
alternatives to TCE are under increased regulatory scrutiny, especially 
at state levels, because they may be subject to state PFAS laws based 
on their chemical structure and properties (Ref. 32). These discussions 
with SERs informed the Panel recommendations.
    EPA has considered input from SERs and other stakeholders regarding 
alternatives to TCE, as well as the information used for the 
Alternatives Assessment. In deciding whether to propose prohibition or 
other significant restrictions on a condition of use of TCE and in 
proposing an appropriate transition period for any such action, EPA has 
therefore, pursuant to TSCA section 6(c)(2)(C), considered, to the 
extent practicable, whether technically and economically feasible 
alternatives that benefit human health or the environment, compared to 
the use proposed to be prohibited or restricted, would be reasonably 
available as a substitute when a proposed prohibition or other 
significant restriction would become effective. EPA is additionally 
requesting comment on the Alternatives Assessment as a whole.

VII. TSCA Section 6(c)(2) Considerations: Magnitude of Human Exposure, 
Environmental Effects of TCE, Benefits of TCE for Various Uses, and 
Reasonably Ascertainable Economic Consequences

    As described in Unit IV., TSCA section 6(a) rules must be 
promulgated ``in accordance with subsection (c)(2).'' TSCA section 
6(c)(2)(A) requires EPA, in proposing and promulgating TSCA section 
6(a) rules, to ``consider and publish a statement based on reasonably 
available information'' with respect to listed criteria, including the 
effects and magnitude of exposure to human health and the environment, 
the benefits of the chemical substance for various uses, and the 
reasonably ascertainable economic consequences of the rule. Under TSCA 
section 6(c)(2)(B), EPA must ``factor in, to the extent practicable,'' 
the considerations under TSCA section 6(c)(2)(A) when selecting among 
prohibitions and other restrictions in TSCA section 6(a) rules. EPA's 
consideration of the health effects of TCE is in Unit IV.; EPA's 
consideration of the remaining considerations under TSCA section 
6(c)(2) are in this unit.

A. Magnitude of Human Exposure to TCE

    TSCA section 6(c)(2)(B) directs EPA to factor in, to the extent 
practicable, the magnitude of human exposure to TCE under TSCA section 
6(c)(2)(A). EPA's analysis of the magnitude of human exposure to TCE 
are in the 2020 Risk Evaluation for TCE (Ref. 1). A summary is 
presented here.
    Regarding the magnitude of human exposure, one factor EPA considers 
for the conditions of use that drive unreasonable risk is the size of 
the exposed population which, for TCE, EPA estimates is 43,675 workers, 
8,920 ONUs, and 20,600 consumers (Ref. 3).
    For the conditions of use that drive the unreasonable risk for TCE, 
PESS include workers and occupational non-users (ONUs), including men 
and women of reproductive age, adolescents, and biologically 
susceptible subpopulations; and consumer users (age 11 and older) and 
bystanders (of any age group, including infants, toddlers, children, 
and elderly), including biologically susceptible subpopulations.
    In addition to workers, ONUs, consumers, and bystanders to consumer 
use directly exposed to TCE, EPA recognizes there is exposure to the 
general population from air and water pathways for TCE. As mentioned in 
Unit II.D., EPA has separately conducted a screening approach to assess 
whether there may be potential risks to the general population from 
these exposure pathways. The screening approach was developed in order 
to allow EPA to determine--with confidence--situations which present no 
unreasonable risk to fenceline communities or where further 
investigation would be needed to develop a more-refined estimate of 
risk. The fenceline technical support memos for the ambient air pathway 
and the water pathway provide the Agency with a quantitative assessment 
of exposure. For TCE, the results from applying this screening approach 
did not allow EPA to rule out unreasonable risk to fenceline 
communities. This unit summarizes the results of that fenceline 
analysis. Although EPA is not making a determination of unreasonable 
risk based on the fenceline screening analysis, the proposed regulatory 
action described in Unit V.--which would ultimately prohibit all 
conditions of use of TCE is expected to eliminate the risks identified 
in the screening approach.
    As described in Unit II.D., EPA's analysis methodology was 
presented to the SACC peer review panel in March 2022, and EPA 
considered SACC feedback (including the SACC recommendation to EPA to 
consider multiple years of release data to estimate exposures and 
associated risks) when applying the fenceline analysis to TCE. EPA also 
plans to consider SACC feedback and make decisions regarding how to 
build upon the screening approach so that EPA can more accurately 
assess and quantify general population exposures in upcoming risk 
evaluations, such as for the 1,4-dioxane supplement, the forthcoming 20 
High Priority Substances, and manufacturer-requested risk evaluations. 
For TCE, EPA is including a multi-year assessment of the ambient air 
pathway in light of peer review comments on the initial methodology.
    EPA interpreted risk estimates in relation to the benchmark values 
corresponding to each hazard value. In the case of acute and chronic 
exposures to drinking water, as well as incidental oral and incidental 
dermal exposures in ambient waters, potential for noncancer risk was 
identified by those risk estimates below the benchmark MOE for acute 
and chronic non-cancer immunotoxicity and developmental endpoints. 
While cancer risks were not assessed for incidental oral or dermal 
exposure pathways, cancer risks were assessed for inhalation exposures. 
For cancer, potential for risk was identified by those risk estimates 
above the benchmark. For the air pathway, EPA's analysis identified 
risk estimates that did not exceed the benchmarks for at least two non-
cancer endpoints (developmental and immunotoxicity), and risk estimates 
above the benchmark for cancer. Estimates of cancer risk to fenceline 
communities were calculated and compared to 1 x 10-6 as a 
benchmark value for cancer risk in fenceline communities. Cancer 
benchmarks used by EPA and other regulatory agencies in interpreting 
the significance of cancer risks range from 1 in 1,000,000 to 1 in 
10,000 (i.e., 1 x 10-6 to 1 x 10-4) depending on 
the subpopulation exposed (see, e.g., EPA's interpretation set forth in 
the Federal Register of September 14, 1989 (54 FR 38044) which 
discusses the use of benchmarks for purposes of assessing exposures to 
individuals living in the vicinity of air emissions sources under 
section 112 of the Clean Air Act (CAA); see also EPA's interpretation 
of the upper bound of acceptable risk and the preferred benchmark 
described in the Letter of Concern regarding EPA Complaint Nos. 01R-22-
R6, 02R-22-R6, and 04R-22-R6 (Ref. 76, see page 3

[[Page 74769]]

footnotes 5 and 6, and page 6)). While EPA is unable to formally 
determine, based on the screening level fenceline analysis, whether 
risks to the general population drive the unreasonable risk, as a 
matter of risk management policy EPA considers the range of 1 in 
1,000,000 to 1 in 10,000 (i.e., 1 x 10-6 to 1 x 
10-4) as the appropriate values for interpreting the 
significance of increased cancer risk for the general population, 
including fenceline communities. It is preferable to have the air or 
water concentrations of TCE result in an increased cancer risk closer 
to the 1 in 1,000,000 (1 x 10-6) value, with the 1 in 10,000 
(1 x 10-4) value generally representing the upper bound of 
acceptability for estimated excess cancer risk. Benchmark values help 
inform decisions regarding the significance of risk, and the Agency 
considers a number of other factors when determining whether risks are 
significant, such as the endpoint under consideration, the 
reversibility of effect, and exposure-related considerations (e.g., 
duration, magnitude, or frequency of exposure, or population exposed).
    In this unit, EPA presents the results of its ambient air and water 
pathways fenceline analysis and the uncertainties associated with the 
analysis. Overall, EPA's fenceline analysis for the air and water 
pathways for TCE did not allow EPA to rule out unreasonable risk to 
fenceline communities with confidence. Additionally, based on the 
fenceline analysis for the ambient air and water pathways for TCE, 
including the strengths, limitations, and uncertainties associated with 
the information used to inform the analysis, EPA is unable to determine 
with this analysis whether those risks drive the unreasonable risk of 
injury to health presented by TCE. EPA also describes how the proposal 
to prohibit the manufacturing (include importing), processing, and 
distribution in commerce of TCE for all uses of TCE (including all 
consumer use) is expected to eliminate the potential risks identified 
in the screening analysis to any general population or fenceline 
communities close to facilities engaging in TCE use. This unit also 
describes how EPA believes the proposed WCPP requirements may reduce 
exposures to the general population for facilities identified in the 
fenceline analysis with expected exposures to fenceline communities 
that are associated with conditions of use for which EPA is proposing 
longer compliance timeframes (including under a TSCA section 6(g) time-
limited exemption). EPA therefore does not intend to revisit the air or 
water pathways for TCE as part of a supplemental risk evaluation.
1. Ambient Air Pathway Analysis
    The ambient air fenceline analysis was divided into three 
components: (1) A single-year ambient air analysis, (2) A multi-year 
ambient air analysis, and (3) A land use analysis. EPA conducted an 
ambient air analysis for a single year and multiple years to assess 
where estimates exceeded the one in a million risk estimates for non-
cancer and cancer risk for real and generic, or modeled, facilities at 
multiple distances. After doing an initial screen (the single year 
ambient air screening analysis) that did not rule out unreasonable 
risk, EPA conducted additional analyses (the multi-year ambient air 
analysis) from which it derived risk estimates that, with a small 
number of exceptions, are within the cancer benchmarks used by EPA and 
other regulatory agencies of 1 in 10,000 to 1 in 1,000,000. The single 
year ambient air screening analysis and the multi-year ambient air 
analysis allow EPA to mathematically calculate a cancer risk in 
fenceline communities. The Agency then conducted a land use analysis as 
part of both the single-year and multi-year analyses to determine if 
EPA could reasonably expect an exposure to fenceline communities to 
occur within the modeled distances for facilities where there was an 
indication of risk. This review consisted of a visual analysis using 
aerial imagery and interpreting land/use zoning practices around each 
facility to identify where residential, industrial/commercial 
businesses, or other public spaces are present within those radial 
distances indicating risk (as opposed to uninhabited areas), as well as 
whether the radial distances lie outside the boundaries of the 
facility.
    There are some uncertainties associated with the fenceline analysis 
for the air pathway for TCE. The TRI dataset used for the single- and 
the multi-year fenceline analysis and land use analysis does not 
include actual release point locations, which can affect the estimated 
concentrations at varying distances modeled. To identify the release 
location for each facility, EPA used a local-coordinate system based on 
latitude/longitude coordinates reported in TRI. The latitude/longitude 
coordinates may represent the mailing address location of the office 
building associated with a very large facility or some other area of 
the facility rather than the actual release location (e.g., a specific 
process stack). This discrepancy between the coordinates reported in 
TRI and the actual release point could result in an exposure 
concentration that does not represent the actual distance where 
fenceline communities may be exposed. The fenceline analysis also 
evaluated the most ``conservative exposure scenario'' that consists of 
a facility that operates year-round (365 days per year, 24 hours per 
day, 7 days per week) in a South Coastal meteorologic region and a 
rural topography setting (Ref. 77). Therefore, the modeled exposures to 
people who live in fenceline communities may be overestimated if there 
are fewer exposure days per year or hours per day.
    Additionally, the ambient air fenceline analysis (as well as the 
water pathway analysis, described in Unit VII.A.2.) organizes 
facilities and associated risks by OES and generally crosswalks each 
OES with the associated condition of use of TCE (Ref. 77). For some 
OES, EPA identified the associated conditions of use to the category 
level in the November 2020 Risk Evaluation for TCE, but, for the air 
pathway, was unable to identify the conditions of use to the 
subcategory level due to limited information on activities and use of 
TCE reported under TRI. Therefore, some OES indicating increased risk 
from ambient air exposures to TCE in the air fenceline analysis may be 
associated with one or more conditions of use of TCE.
    EPA's analysis included inhalation hazard values for cancer and 
non-cancer risk (acute and chronic immunological and developmental 
endpoints). Because risk estimates did not exceed the benchmarks for 
any risks of non-cancer effects, the results presented focus on cancer 
risks. EPA's single year fenceline analysis for the ambient air 
pathway, based on methods presented to the SACC, evaluated TCE releases 
reported to TRI over the 2019 reporting year. This single-year 
fenceline analysis identified risk estimates exceeding one in a million 
for cancer risk for 99 of the 133 facilities (including generic, or 
modeled, facilities) at multiple distances, representing 13 OES. While 
the analysis identified facilities with some indication of releases and 
potential exposure with associated increased cancer risk that exceeds 
one in a million at a distance of 100 meters or more from the releasing 
facility, the analysis did not identify any facilities exceeding 1 in 
10,000; the highest risk estimate is in the 1 in 100,000 range. 
Separately, following SACC feedback, EPA applied a slightly modified 
pre-screening methodology to evaluate 6 years of TCE release data (2015 
through 2020 TRI data as well as the 6-year average of that data) 
rather than a single year of data for facilities with reported releases 
in TRI. Although the multi-year analysis

[[Page 74770]]

identified several additional facilities with risk estimates above one 
in a million for cancer farther out when compared to the single year 
analysis or that were not captured in the single-year analysis, the 
results of the overall risk profiles (i.e., OES and corresponding 
conditions of use with risk estimates above one in a million for cancer 
at the distances evaluated) indicated a higher risk profile than the 
single year analysis: the multi-year analysis identified 217 facilities 
and found risk estimates above one in a million for cancer in 133 of 
those facilities at a distance of 100 meters from the releasing 
facility. Based on the multi-year analysis, 58 of these 133 facilities 
either had risks above one in a million for cancer at distances farther 
out than 100 meters when compared to the single year analysis or are 
facilities that were not captured in the single-year analysis (e.g., 
did not report in 2019 TRI). The analysis did not identify any 
facilities exceeding 1 in 10,000 at a distance greater than 100 meters; 
the highest risk estimate is in the 1 in 100,000 range (Ref. 77).
    EPA conducted a land use analysis to determine if EPA can 
reasonably expect an exposure to fenceline communities to occur within 
the modeled distances for facilities where there was an indication of 
risk in the single year or multi-year fenceline analysis. This review 
consisted of a visual analysis using aerial imagery and interpreting 
land/use zoning practices around the facility to identify where 
residential, industrial/commercial businesses, or other public spaces 
are present within those radial distances indicating risk (as opposed 
to uninhabited areas), as well as whether the radial distances lie 
outside the boundaries of the facility. The land use analysis of the 85 
facilities with risk indicating risk in the single-year fenceline 
analysis identified 69 facilities with expected exposure to fenceline 
communities. The land use analysis of the 58 facilities indicating risk 
in the multi-year fenceline analysis (i.e., facilities where risk 
estimates were above one in a million for cancer at distances farther 
out when compared to the single-year analysis or facilities that were 
not captured in the single year analysis) identified a total of 55 
facilities with expected exposure to fenceline communities. Those 
facilities represent 10 OES and include: degreasing (batch open-top 
degreasing; batch closed-loop degreasing; conveyorized vapor 
degreasing; web vapor degreasing; cold cleaning); formulation of 
aerosol and non-aerosol products; industrial processing aid; 
manufacturing; metalworking fluids; other industrial uses; process 
solvent recycling and worker handling of wastes; processing as a 
reactant; recycling and disposal; and repackaging (Ref. 77).
    Under the proposed regulatory action described in Unit V.A., each 
of the conditions of use that indicate risk relative to the one in a 
million cancer risk estimate would ultimately be prohibited, many of 
them within one year. As a result, exposures to any fenceline 
communities from these facilities would be eliminated under the 
prohibitions in this proposed rulemaking. The risks to fenceline 
communities from exposure further strengthens the impetus for EPA's 
prohibition of TCE.
    EPA recognizes that there are some facilities for which risks are 
indicated that may exceed the one in a million risk estimate and with 
expected exposure to fenceline communities that may be associated with 
the following conditions of use that EPA is proposing to prohibit under 
longer compliance timeframes: degreasing (batch open-top degreasing; 
batch closed-loop degreasing; conveyorized vapor degreasing; web vapor 
degreasing; cold cleaning); industrial processing aid; manufacturing; 
and processing as a reactant. For processing as a reactant, EPA notes 
that while the analysis identified facilities with some indication of 
releases and potential exposure with associated increased cancer risk 
that exceeds one in a million at a distance of 100 meters from the 
releasing facility, the analysis did not identify any facilities 
exceeding 1 in 10,000; the highest risk estimate is in the 1 in 100,000 
range. For this and other conditions of use that may be associated with 
facilities that indicate risks with expected exposure to fenceline 
communities, the proposed rule would require strict workplace exposure 
controls via implementation of a WCPP as described in Unit V.A.2., 
until the prohibition compliance date. Under the proposed WCPP 
requirements, facilities would need to monitor indoor TCE air 
concentrations, which would allow facilities to better understand and 
manage the total releases of TCE. Furthermore, under the WCPP 
requirements, facilities would need to evaluate controls to determine 
how to reduce releases and exposures to potentially exposed persons in 
the workplace. EPA anticipates that this analysis would help facilities 
to determine the most effective ways to reduce exposures (including 
possible engineering controls or elimination/substitution of TCE) and 
whether those methods for exposure reduction impact releases, and 
therefore may reduce the overall risk to fenceline communities from 
facilities permitted to use TCE under a longer compliance timeframe 
until the prohibition compliance date. As further detailed in Unit 
V.A.2.b.iii., EPA is also requesting comment on whether industry 
anticipates increased releases of TCE to outdoor air associated with 
the implementation of the WCPP. In order to avoid unintended increases 
in exposures to people from TCE emissions to ambient air, EPA requests 
comment on whether owners and operators should be required to attest in 
their exposure control plan that engineering controls selected do not 
increase emissions of TCE to ambient air outside of the workplace and 
document in their exposure control plan whether additional equipment 
was installed to capture emissions of TCE to ambient air. EPA requests 
comment on how such a requirement could impact the availability, 
feasibility, or cost of engineering controls as a means to reduce 
workplace exposures to or below the proposed ECEL. EPA is also 
soliciting comment on the frequency and nature of air monitoring EPA 
should consider including as requirements in the final rule.
    In the instances where efforts to reduce exposures in the workplace 
to levels below the ECEL could lead to adoption of engineering controls 
that ventilate more TCE outside, EPA believes this potential exposure 
would be limited as a result of the existing NESHAP for TCE for these 
conditions of use under the CAA. Applicable NESHAP include: 40 CFR part 
63, subpart F, Synthetic Organic Chemical Manufacturing Industry; 40 
CFR part 63, subpart DD, Off-Site Waste and Recovery Operations; 40 CFR 
part 63, subpart VVV, Publicly Owned Treatment Works; 40 CFR part 63, 
subpart VVVVVV, Chemical Manufacturing Area Sources; 40 CFR part 63, 
subpart GG, Aerospace Manufacturing and Rework Facilities; 40 CFR part 
63, subpart T, Halogenated Solvent Cleaning, which impose emission 
standards and work practice requirements reflecting maximum achievable 
control technology and generally available control technology. The CAA 
required residual risk reviews for standards reflecting maximum 
achievable control technology, and technology reviews are required 
every 8 years for all NESHAP.
2. Water Pathway Analysis
    The methods used to assess the water pathways (i.e., drinking water 
or incidental dermal or oral exposure in ambient waters) for TCE are 
consistent

[[Page 74771]]

with the methods described in the 2022 Fenceline report that underwent 
peer review (Ref. 78). Briefly, EPA assessed exposure via drinking 
water, incidental oral ingestion, and incidental dermal contact based 
on modeled stream and water body concentrations, using information 
described and documented in the November 2020 TCE Risk Evaluation (Ref. 
1). This included the amount of chemical released to wastewater, the 
release days per year (with a high end of 250 to 365 days per year, and 
a low end of 20 days per year), the percent removal from wastewater 
treatment, and site-specific stream flow or dilution factors.
    There are some uncertainties associated with the fenceline analysis 
for the water pathway for TCE. For the ambient water pathway, exposures 
were evaluated based on modeled stream and water body concentrations 
using E-FAST 2014, which is subject to a number of uncertainties. For 
example, stream flow data available in the E-FAST 2014 at the time of 
this analysis were 15 to 30 years old and therefore may not represent 
current conditions at a particular location. Additionally, E-FAST 2014 
estimates waterbody surface water concentrations at the point of 
release without considering certain post-release environmental fate of 
degradation processes, which may lead to higher predicted surface water 
concentrations. Similarly, estimated drinking water exposures are based 
on assumptions that an individual is exposed to potential waterbody 
concentrations at the point of release without any potential for 
transport, dilution, or treatment and therefore represent higher-end 
estimates of possible drinking water exposures (Ref. 79). An additional 
uncertainty relates to the crosswalk of a given facility to a 
particular OES and then condition of use; as described in Unit 
VII.A.2., due to limited information on activities and use of TCE in 
the data sources available, there is uncertainty if the facilities 
associated with a specific OES were correctly cross-walked to the 
appropriate condition of use, or whether some OESs indicating increased 
risk from water exposures to TCE should be associated with more than 
one condition of use.
    EPA's screening level analysis for the water pathway for TCE, based 
on methods presented to the SACC, found potential risks from several 
OES from exposure to drinking water, incidental dermal or incidental 
oral exposure in ambient waters. The estimated exposure values for the 
screening level assessed water pathway resulted in estimated acute 
noncancer, chronic noncancer, or cancer risk for relative to their 
respective benchmark values for various evaluated OESs (Ref. 79).
    The drinking water analysis modeled a total of 101 releases across 
all OES for the 20-day release scenario, and modeled a total of 103 
releases for the maximum days of release scenario. For the drinking 
water exposure, risks relative to the benchmark for the acute non-
cancer developmental endpoint for both the 20-day and maximum days of 
release scenarios for at least one facility in each of the following 
OES: Manufacturing; Processing as a Reactant; Degreasing; Repackaging; 
Process Solvent Recycling; Adhesives, Sealants, Paints and Coatings; 
Industrial Processing Aid, and Other Industrial Uses. For drinking 
water exposures, at least one facility indicated an increased cancer 
risk at or above 1 in 1,000,0000 (but less than 1 in 100,000) for both 
the 20-day and maximum days of release scenarios for the Degreasing and 
Repackaging OES. EPA did not identify source water drinking water 
intakes for public drinking water systems within 10 miles downstream of 
facilities with known locations discharging to identifiable 
waterbodies. No risks relative to acute or chronic exposures for the 
immune endpoint or for chronic exposures for the developmental endpoint 
benchmarks were identified for any OES for drinking water exposures; 
for the immune endpoint, estimated margins of exposure were at least 4-
fold higher than benchmarks.
    For the incidental oral exposure in ambient water, a total of 113 
releases were modeled across all OES for the 20-day release scenario, 
and a total of 115 releases were modeled across all OES for the maximum 
days of release scenario. Risks relative to the benchmark were 
identified for at least one facility for the acute non-cancer 
developmental endpoint under the 20-day scenarios for Processing as a 
Reactant; Degreasing; Repackaging; Process Solvent Recycling; 
Adhesives, Sealants, Paints, and Coatings; and Other Industrial Uses 
OESs were identified for the 20-days of release scenario. For the 
maximum days of release scenario, risks relative to the benchmark for 
the acute developmental endpoint were identified for: Processing as a 
Reactant and Degreasing. For the immune endpoint, no risks were 
identified relative to the acute exposures benchmark. For chronic 
scenarios, risk was identified relative to the benchmarks for both the 
immune and developmental endpoints for the 20-day and maximum days of 
release scenarios. Specifically, at least one facility in the 
Degreasing OES was identified as showing risk relative to both 
endpoints for the maximum risk scenarios for both types of releases 
(20-day and maximum), and at least one facility in the Processing as a 
Reactant OES was identified as showing risk relative to the 
developmental endpoint for both the 20-day and maximum release 
scenarios.
    Similarly, for the incidental dermal exposure in ambient waters 
pathway, a total of 113 releases were modeled across all OES for the 
20-day release scenario, and a total of 115 releases were modeled 
across all OES for the maximum days of release scenario. For both 
incidental oral and incidental dermal exposures, EPA did not assess 
cancer risk because repeated exposures are not expected to continue 
across a lifetime. For acute scenarios, risk was identified for at 
least one facility relative to both the immune and developmental 
endpoints for the 20-day and maximum release scenarios. For 20-day 
release scenarios, the immune endpoint had identified risk relative to 
the benchmark for at least one facility in the Degreasing OES, while 
the developmental endpoint had identified risk relative to the 
benchmark for the at least one facility in the following OES: 
Processing as a Reactant; Degreasing; Repackaging; Process Solvent 
Recycling; Adhesives, Sealants, Paints, and Coatings; Industrial 
Processing Aid; and Other Industrial Uses. For the maximum days of 
release scenarios, risk relative to the developmental endpoint was 
identified for at least one facility in the Processing as a Reactant 
and the Degreasing OES. For chronic scenarios, risk was identified 
relative to both the immune and developmental endpoint benchmarks for 
at least one facility for both the 20-day and maximum days of release 
scenarios. For 20-day release scenarios, the Processing as a Reactant 
and Degreasing OES had risks identified relative to the immune and 
developmental endpoint benchmarks; for the maximum days release 
scenarios, the Processing as a Reactant and Degreasing OES had risks 
identified relative to the immune and developmental endpoint 
benchmarks.
    Overall, for the analysis of the water pathway, EPA identified 
potential risks that exceed the benchmark for non-cancer endpoints from 
several facilities, representing benchmark exceedances between 1 and 10 
OES, depending on whether the drinking water, incidental oral, or 
incidental dermal exposures are considered. In each case for the 
screening level analysis, risks were identified only for the maximum 
risk scenarios (or facilities with the highest reported results), and 
for a relatively

[[Page 74772]]

small number of facilities. In instances where a facility may be 
engaging in a condition of use with a longer phase-out, EPA notes that 
in no instances did EPA identify drinking water intakes within 10 miles 
of a discharging facility, and emphasizes that the scenarios analyzed 
include significant uncertainties and assumptions within the high-end 
risk estimates due to reliance on the highest-reported results from 
several facilities (Ref. 79). Regarding cancer risks, while the 
analysis identified facilities with some indication of releases and 
potential drinking water exposure with associated increased cancer risk 
that exceeds more than 1 in 1,000,000, the analysis did not identify 
any facilities exceeding more than 1 in 10,000; the highest potential 
risk estimate is in the 1 in 100,000 range (Ref. 79).
    Under the proposed regulatory action described in Unit V.A., all 
conditions of use would ultimately be prohibited and so any potential 
risk indicated by this screening analysis would be eliminated. In 
particular, under the proposed regulatory action the disposal of TCE to 
industrial pre-treatment, industrial treatment, or publicly owned 
treatment works would be prohibited. The risks to fenceline communities 
from exposure through water further strengthen the impetus for EPA's 
prohibition of TCE. EPA therefore does not intend to revisit the water 
pathway for TCE as part of a supplemental risk evaluation.

B. Environmental Effects of TCE and the Magnitude of Exposure of the 
Environment to TCE

    EPA's analysis of the environmental effects of TCE and the 
magnitude of exposure of the environment to TCE are in the 2020 Risk 
Evaluation for TCE (Ref. 1). The unreasonable risk determination for 
TCE is based solely on risks to human health (Ref. 2); based on the 
TSCA 2020 Risk Evaluation for TCE, EPA determined that exposures to the 
environment did not drive the unreasonable risk. A summary is presented 
here.
    For all conditions of use, amphibian, fish, and aquatic 
invertebrate acute and chronic exposures to TCE do not drive the 
unreasonable risk. To characterize the exposure to TCE by aquatic 
organisms, EPA assessed environmental exposures derived from predicted 
and measured concentrations of TCE in surface water in the U.S. 
Specifically, the aquatic exposures associated with the industrial and 
commercial conditions of use were predicted through modeling, and the 
aquatic exposure assessment also includes an analysis of collected 
measured surface water concentrations from monitoring data. EPA 
considered the biological relevance of the species to determine the 
concentrations of concern for the location of surface water 
concentration data to produce risk quotients, as well as frequency and 
duration of the exposure. EPA determined that the evaluation does not 
support an unreasonable risk determination to aquatic organisms.
    The toxicity of TCE to sediment-dwelling invertebrates is similar 
to the toxicity to aquatic invertebrates. TCE is expected to remain in 
aqueous phases and not adsorb to sediment due to its water solubility 
and low partitioning to organic matter. TCE has relatively low 
partitioning to organic matter and biodegrades slowly, so TCE 
concentrations in sediment pore water are expected to be similar to the 
concentrations in the overlying water or lower in the deeper part of 
sediment where anaerobic condition prevails. Thus, the TCE detected in 
sediments is likely from the pore water. Therefore, for sediment-
dwelling organisms, the risk estimates, based on the highest ambient 
surface water concentration, do not support an unreasonable risk 
determination to sediment-dwelling organisms from acute or chronic 
exposures.
    For terrestrial organisms, TCE exposure is expected to be low since 
physical-chemical properties do not support an exposure pathway through 
water and soil pathways to these organisms. Therefore, for terrestrial 
organisms, the risk estimates, based on the EPA 2003 Guidance for 
Ecological Soil Screening Levels, do not support an unreasonable risk 
determination from acute or chronic exposures.

C. Benefits of TCE for Various Uses

    TCE has a wide range of uses, including as an intermediate during 
the manufacture of refrigerants, specifically HFC-134a, and is also 
used as a solvent, frequently in cleaning and degreasing (including 
spot cleaning, vapor degreasing, cold cleaning, and aerosol 
degreasing). A variety of consumer and commercial products use TCE as 
adhesives and sealants, in paints and coatings, and in other 
miscellaneous products. TCE is subject to Federal and State regulations 
and reporting requirements.
    The largest uses of TCE, by production volume, are for processing 
as a reactant/intermediate as well as aerosol and vapor degreasing 
uses. Based on the 2020 Risk Evaluation for TCE, over 84% of the 
production volume of TCE is processed as a reactant/intermediate, the 
majority of the volume is for TCE processed as an intermediate in the 
production of HFC-134a, a refrigerant widely used in a broad range of 
applications. The second largest use of TCE is in industrial and 
commercial uses for aerosol and vapor degreasing. TCE is a relatively 
inexpensive solvent useful for cleaning contaminated metal parts and 
other fabricated materials (Ref. 3).
    TCE has many other uses, which, based on the 2020 Risk Evaluation 
for TCE, collectively constitute about 1% of the production volume 
(Ref. 1). In battery separator manufacturing, TCE is used as an 
extraction solvent to produce the desired porosity in lead-acid and 
lithium battery separators, which are essential to power vehicles and 
systems in the U.S. supply chain.

D. Reasonably Ascertainable Economic Consequences of the Proposed Rule

1. Likely Effect of the Rule on the National Economy, Small Business, 
Technological Innovation, the Environment, and Public Health
    The reasonably ascertainable economic consequences of this proposed 
rule include several components, all of which are described in the 
Economic Analysis for this proposed rule (Ref. 3). With respect to the 
anticipated effects of this proposed rule on the national economy, EPA 
considered the number of businesses and workers that would be affected 
and the costs and benefits to those businesses and workers and did not 
find that there would be an impact on the national economy (Ref. 3). 
The economic impact of a regulation on the national economy becomes 
measurable only if the economic impact of the regulation reaches 0.25% 
to 0.5% of Gross Domestic Product (GDP) (Ref. 80). Given the current 
(real) GDP [of $60.4 trillion (2022)], this is equivalent to a cost of 
$151 billion to $302 billion. Therefore, because EPA has estimated that 
the monetized cost of the proposed rule would range from $33.1 million 
annualized over 20 years at a 3% discount rate and $40.6 million 
annualized over 20 years at a 7% discount rate, EPA has concluded that 
this action is highly unlikely to have any measurable effect on the 
national economy (Ref. 3). EPA does not have data to quantify 
employment impacts of the proposed rule, and large employment impacts 
are not expected. Instead, workers currently using TCE are expected to 
continue employment while shifting away from TCE use and towards 
alternatives. However, EPA acknowledges that transitional employment 
impacts may be

[[Page 74773]]

experienced by some workers at facilities that opt to close or shift 
operations abroad instead of complying with requirements at the 
facilities currently using TCE. EPA considered the employment impacts 
of this proposed rule, and found that the direction of change in 
employment is uncertain, but EPA expects the short-term and longer-term 
employment effects to be small.
    Of the small businesses potentially impacted by this proposed rule, 
99.1% are expected to have impacts of less than 1% to their firm 
revenues, 0.5% are expected to have impacts between 1 and 3% to their 
firm revenues, and 0.4% are expected to have impacts greater than 3% to 
their firm revenues. The largest segment of businesses that would be 
affected by this regulation are commercial users of liquid and aerosol 
degreasers. Costs of alternatives were found to be both higher and 
lower than products containing TCE. For most product types, 
alternatives with similar efficacy are available with costs that both 
lower and higher than TCE products. However, there may be some 
applications where TCE is more effective, reducing labor time and wait 
time, and or where extensive safety testing might be required. EPA was 
unable to quantify these costs.
    With respect to this proposed rule's effect on technological 
innovation, EPA expects this action to spur more innovation than it 
will hinder. A prohibition or significant restriction on the 
manufacture, processing, and distribution in commerce of TCE for uses 
covered in this proposed rule may increase demand for safer chemical 
substitutes. This proposed rule is not likely to have significant 
effects on the environment because TCE does not present an unreasonable 
risk to the environment, though this proposed rule does present the 
potential for small reductions in air emissions and soil contamination 
associated with improper disposal of products containing TCE. The 
effects of this proposed rule on public health are estimated to be 
positive, due to the reduced risk of cancer and other non-cancer 
endpoints from exposure to TCE.
2. Costs and Benefits of the Proposed Regulatory Action and of the One 
or More Primary Alternative Regulatory Actions Considered by the 
Administrator
    The costs and benefits that can be monetized for this proposed rule 
are described at length in in the Economic Analysis (Ref. 3). The 
monetized costs for this proposed rule are estimated to range from 
$33.1 million annualized over 20 years at a 3% discount rate and $40.6 
million annualized over 20 years at a 7% discount rate. The monetized 
benefits are estimated to range from $18.1 to $21.5 million annualized 
over 20 years at a 3% discount rate and $8.2 to $10.3 million 
annualized over 20 years at a 7% discount rate.
    EPA considered the estimated costs to regulated entities as well as 
the cost to administer and enforce alternative regulatory actions. The 
primary alternative regulatory action is described in detail in Unit 
V.B. The estimated annualized costs of the alternative regulatory 
action are $34.4 million at a 3% discount rate and $41.2 million at a 
7% discount rate over 20 years (Ref. 3). The monetized benefits of this 
alternative regulatory action are estimated to range from $18.1 to 
$21.5 million annualized over 20 years at a 3% discount rate and $8.2 
to $10.3 million annualized over 20 years at a 7% discount rate over 20 
years (Ref. 3).
    This proposal is expected to achieve health benefits for the 
American public, some of which can be monetized and others that, while 
tangible and significant, cannot be monetized. EPA believes that the 
balance of costs and benefits of this proposal cannot be fairly 
described without considering the additional, non-monetized benefits of 
mitigating the non-cancer adverse effects. These effects may include 
neurotoxicity, kidney toxicity, liver toxicity, immunological and 
hematological effects, reproductive effects, and developmental effects. 
The multitude of adverse effects from TCE exposure can profoundly 
impact an individual's quality of life, as discussed in Unit II.A. 
(overview), Unit III.B.2. (description of the unreasonable risk), Unit 
V.A. (discussion of the health effects), and the 2020 Risk Evaluation 
for TCE. Chronic adverse effects of TCE exposure include both cancer 
and the non-cancer effects listed in this paragraph. Acute effects of 
TCE exposure could be experienced for a shorter portion of life but are 
nevertheless significant in nature. The incremental improvements in 
health outcomes achieved by given reductions in exposure cannot be 
quantified for non-cancer health effects associated with TCE exposure, 
and therefore cannot be converted into monetized benefits. The 
qualitative discussion throughout this rulemaking and in the Economic 
Analysis highlights the importance of these non-cancer effects. These 
effects include willingness-to-pay to avoid illness, which includes 
cost of illness and other personal costs such as pain and suffering. 
Considering only monetized benefits underestimates the impacts of TCE 
adverse outcomes and therefore underestimates the benefits of this 
proposed rule.
3. Cost Effectiveness of the Proposed Regulatory Action and of the 1 or 
More Primary Alternative Regulatory Actions Considered by the 
Administrator
    Cost effectiveness is a method of comparing certain actions in 
terms of the expense per item of interest or goal. A goal of this 
proposed regulatory action is to achieve the risk reduction standard in 
a [more] cost-effective manner, with estimated [lower] costs and 
[higher] net benefits, than other considered alternative regulatory 
actions (Ref. 3). The proposed regulatory action would cost $6.8-7.7 
million per potential prevented cancer case while the primary 
alternative regulatory action would cost $7.1-8.0 million (using the 3% 
discount rate) to achieve the same goals. While the primary alternative 
regulatory action is lower in cost compared to the proposed regulatory 
action, the difference is small (Ref. 3).

VIII. TSCA Section 9 Analysis, Section 14, and Section 26 
Considerations

A. TSCA Section 9(a) Analysis

    TSCA section 9(a) provides that, if the Administrator determines, 
in the Administrator's discretion, that an unreasonable risk may be 
prevented or reduced to a sufficient extent by an action taken under a 
Federal law not administered by EPA, the Administrator must submit a 
report to the agency administering that other law that describes the 
risk and the activities that present such risk. TSCA section 9(a) 
describes additional procedures and requirements to be followed by EPA 
and the other Federal agency following submission of any such report. 
As discussed in this unit, for this proposed rule, the Administrator 
proposes to exercise his discretion not to determine that the 
unreasonable risk from TCE under the conditions of use may be prevented 
or reduced to a sufficient extent by an action taken under a Federal 
law not administered by EPA.
    In addition, TSCA section 9(d) instructs the Administrator to 
consult and coordinate TSCA activities with other Federal agencies for 
the purpose of achieving the maximum enforcement of TSCA while imposing 
the least burdens of duplicative requirements. For this proposed rule, 
EPA has and continues to coordinate with appropriate Federal executive 
departments and agencies including OSHA and the Consumer Product Safety 
Commission (CPSC), to, among other things, identify their respective

[[Page 74774]]

authorities, jurisdictions, and existing laws with regard to TCE, which 
are summarized in this unit.
    OSHA requires that employers provide safe and healthful working 
conditions by setting and enforcing standards and by providing 
training, outreach, education and assistance. As described in Unit 
II.C., OSHA, in 1971, established a PEL for TCE of 100 ppm of air as an 
8-hour TWA with an acceptable ceiling concentration of 200 ppm and an 
acceptable maximum peak above the acceptable ceiling concentration for 
an eight-hour shift of 300 ppm, maximum duration of 5 minutes in any 2 
hours. However, the exposure limits established by OSHA are higher than 
the exposure limit that EPA determined would be sufficient to address 
the unreasonable risk identified under TSCA from occupational 
inhalation exposures associated with certain conditions of use. Gaps 
exist between OSHA's authority to set workplace standards under the OSH 
Act and EPA's obligations under TSCA section 6 to eliminate 
unreasonable risk presented by chemical substances under the conditions 
of use. Health standards issued under section 6(b)(5) of the OSH Act 
must reduce significant risk only ``to the extent feasible.'' 29 U.S.C. 
655(b)(5). To set PELs for chemical exposure, OSHA must first establish 
that the new standards are economically and technologically feasible 
(79 FR 61384 and 61387, Oct. 10, 2014). But under TSCA section 6(a), 
EPA's substantive burden is to demonstrate that, as regulated, the 
chemical substance no longer presents an unreasonable risk, with 
unreasonable risk being determined without consideration of costs or 
other nonrisk factors. Thus, if OSHA were to initiate a new action to 
lower its PEL, the difference in standards between the OSH Act and TSCA 
may well result in the OSHA PEL being set at a higher level than the 
exposure limit that EPA determined would be sufficient to address the 
unreasonable risk under TSCA.
    In addition, OSHA may set exposure limits for workers, but its 
authority is limited to the workplace and does not extend to consumer 
uses of hazardous chemicals, and thus OSHA cannot address the 
unreasonable risk from TCE under all of its conditions of use, which 
include consumer uses. OSHA also does not have direct authority over 
State and local employees, and it has no authority over the working 
conditions of State and local employees in States that have no OSHA-
approved State Plan under 29 U.S.C. 667.
    CPSC, under authority provided to it by Congress in the CPSA, 
protects the public from unreasonable risk of injury or death 
associated with the use of consumer products. Under the CSPA, CPSC has 
the authority to regulate TCE in consumer products, but not in other 
sectors such as automobiles, industrial and commercial products, or 
aircraft for example (Ref. 81). Further, a consumer product safety rule 
under the CPSA must include a finding that ``the benefits expected from 
the rule bear a reasonable relationship to its costs,'' 15 U.S.C. 
2058(f)(3)(E), whereas EPA must apply TSCA risk management requirements 
to the extent necessary so that the chemical no longer presents 
unreasonable risk and only consider costs and benefits of the 
regulatory action to the extent practicable, 15 U.S.C. 2605(a), (c)(2). 
Additionally, the 2016 amendments to TSCA reflect Congressional intent 
to ``delete the paralyzing `least burdensome' requirement,'' 162 Cong. 
Rec. S3517 (June 7, 2016), a reference to TSCA section 6(a) as 
originally enacted, which required EPA to use ``the least burdensome 
requirements'' that protect ``adequately'' against unreasonable risk, 
15 U.S.C. 2605(a) (1976). However, a consumer product safety rule under 
the CPSA must impose ``the least burdensome requirement which prevents 
or adequately reduces the risk of injury for which the rule is being 
promulgated.'' 15 U.S.C. 2058(f)(3)(F). Analogous requirements, also at 
variance with recent revisions to TSCA, affect the availability of 
action CPSC may take under the Federal Hazardous Substances Act (FHSA) 
relative to action EPA may take under TSCA. 15 U.S.C. 1262.
    EPA therefore concludes that TSCA is the only regulatory authority 
able to prevent or reduce unreasonable risk of TCE to a sufficient 
extent across the range of conditions of use, exposures, and 
populations of concern. This unreasonable risk can be addressed in a 
more coordinated, efficient, and effective manner under TSCA than under 
different laws implemented by different agencies. Moreover, the 
timeframe and any exposure reduction as a result of updating OSHA or 
CPSC regulations cannot be estimated, while TSCA requires a much more 
accelerated 2-year statutory timeframe for proposing and finalizing 
regulatory requirements to address unreasonable risk. Further, there 
are key differences between the finding requirements of TSCA and those 
of the OSH Act, CPSA, and FHSA. For these reasons, in the 
Administrator's discretion, the Administrator has analyzed this issue 
and does not determine that unreasonable risk from TCE may be prevented 
or reduced to a sufficient extent by an action taken under a Federal 
law not administered by EPA. However, EPA is requesting public comment 
on this issue (i.e., the sufficiency of an action taken under a Federal 
law not administered by EPA).

B. TSCA Section 9(b) Analysis

    If EPA determines that actions under other Federal laws 
administered in whole or in part by EPA could eliminate or sufficiently 
reduce a risk to health or the environment, TSCA section 9(b) instructs 
EPA to use these other authorities to protect against that risk unless 
the Administrator determines in the Administrator's discretion that it 
is in the public interest to protect against such risk under TSCA. In 
making such a public interest finding, TSCA section 9(b)(2) states: 
``the Administrator shall consider, based on information reasonably 
available to the Administrator, all relevant aspects of the risk . . . 
and a comparison of the estimated costs and efficiencies of the action 
to be taken under this title and an action to be taken under such other 
law to protect against such risk.''
    Although several EPA statutes have been used to limit TCE exposure 
(Ref. 9), regulations under those EPA statutes have limitations because 
they largely regulate releases to the environment, rather than 
occupational or consumer exposures. While these limits on releases to 
the environment are protective in the context of their respective 
statutory authorities, regulation under TSCA is also appropriate for 
occupational and consumer exposures and in some cases can provide 
upstream protections that would prevent the need for release 
restrictions required by other EPA statutes (e.g., Resource 
Conservation and Recovery Act (RCRA), CAA, Clean Water Act (CWA)).
    The primary exposures and unreasonable risk to consumers, 
bystanders, workers, and ONUs would be addressed by EPA's proposed 
prohibitions and restrictions under TSCA section 6(a). In contrast, the 
timeframe and any exposure reduction as a result of updating 
regulations for TCE under the CAA, CWA, or RCRA cannot be estimated, 
nor would they address the direct human exposure to consumers, 
bystanders, workers, and ONUs from the conditions of use evaluated in 
the 2020 Risk Evaluation for TCE. More specifically, none of EPA's 
other statutes (e.g., RCRA, CAA, CWA) can address exposures to workers 
and ONUs related to the specific

[[Page 74775]]

activities that result in occupational exposures, for example those 
associated with RCRA covered disposal requirements, such as in 40 CFR 
261.24 and 40 CFR 268.3. EPA therefore concludes that TSCA is the most 
appropriate regulatory authority able to prevent or reduce risks of TCE 
to a sufficient extent across the range of conditions of use, 
exposures, and populations of concern.
    For these reasons, the Administrator does not determine that 
unreasonable risk from TCE under the conditions of use evaluated in the 
2020 TSCA Risk Evaluation for TCE, could be eliminated or reduced to a 
sufficient extent by actions taken under other Federal laws 
administered in whole or in part by EPA.

C. TSCA Section 14 Requirements

    EPA is also providing notice to manufacturers, processors, and 
other interested parties about potential impacts to CBI that may occur 
if this rulemaking is finalized as proposed. Under TSCA section 
14(b)(4), if EPA promulgates a rule pursuant to TSCA section 6(a) that 
establishes a ban or phase-out of a chemical substance, the protection 
from disclosure of any CBI regarding that chemical substance and 
submitted pursuant to TSCA will be ``presumed to no longer apply,'' 
subject to the limitations identified in TSCA section 14(b)(4)(B)(i) 
through (iii). If this rulemaking is finalized as proposed, then 
pursuant to TSCA section 14(b)(4)(B)(iii), the presumption against 
protection from disclosure would apply only to information about the 
specific conditions of use that this rulemaking would prohibit or phase 
out. Manufacturers or processors seeking to protect such information 
would be able to submit a request for nondisclosure as provided by TSCA 
sections 14(b)(4)(C) and 14(g)(1)(E). Any request for nondisclosure 
would need to be submitted within 30 days after receipt of notice from 
EPA under TSCA section 14(g)(2)(A). EPA anticipates providing such 
notice via the Central Data Exchange or CDX.

D. TSCA Section 26 Considerations

    In accordance with TSCA section 26(h), EPA has used scientific 
information, technical procedures, measures, methods, protocols, 
methodologies, and models consistent with the best available science. 
As in the case of the unreasonable risk determination, risk management 
decisions for this proposed rule, as discussed in Unit III.B.3. and 
Unit V., were based on a risk evaluation, that was subject to public 
comment and independent, expert peer review, and was developed in a 
manner consistent with the best available science and based on the 
weight of the scientific evidence as required by TSCA sections 26(h) 
and (i) and 40 CFR 702.43 and 702.45.
    In particular, the ECEL values considered for the WCPP are derived 
from the analysis in the 2020 Risk Evaluation for TCE. The proposed 
ECEL value of 0.0011 ppm as an 8-hour TWA is based on developmental 
toxicity, the most sensitive acute and chronic non-cancer health 
endpoint, specifically calculated based on the occupational acute, non-
cancer human equivalent concentration (HEC) for fetal cardiac defects 
(Ref. 13). This is the concentration at which an adult human would be 
unlikely to experience the specified adverse effects if exposed for a 
working lifetime, including susceptible subpopulations. Similarly, the 
ECEL identified under the primary alternative regulatory option, based 
on a different health endpoint, immunotoxicity, is derived from the 
analysis in the 2020 Risk Evaluation for TCE. This ECEL is 0.0040 ppm 
as an 8-hour TWA which is based on the chronic non-cancer occupational 
HEC for autoimmunity (Ref. 14). As discussed in Unit VI.A., among the 
non-cancer adverse health effects, the drivers for EPA's whole chemical 
unreasonable risk determination for TCE under TSCA were identified as 
immunotoxicity, acute immunosuppression, and chronic autoimmunity, from 
inhalation and dermal exposures (Ref. 2). Therefore, reducing exposures 
remaining above the ECEL of 0.0040 ppm would reduce the contribution to 
the unreasonable risk of injury to health driven by inhalation 
exposures in an occupational setting for those conditions of use 
identified as presenting unreasonable risk in the 2020 Risk Evaluation 
for TCE under TSCA (Ref. 1, 14).
    The extent to which the various information, procedures, measures, 
methods, protocols, methodologies or models, as applicable, used in 
EPA's decisions have been subject to independent verification or peer 
review is adequate to justify their use, collectively, in the record 
for this rulemaking. Additional information on the peer review and 
public comment process, such as the peer review plan, the peer review 
report, and the Agency's response to comments, can be found in EPA's 
risk evaluation docket (Docket ID No.: EPA-HQ-OPPT-2016-0737).

IX. Requests for Comment

    EPA is requesting public comment on all aspects of this proposal, 
including the proposed and primary alternative regulatory actions and 
all individual elements of these, and all supporting analysis. 
Additionally, within this proposal, the Agency is soliciting feedback 
from the public on specific issues throughout this proposed rule. For 
ease of review, this unit summarizes those specific requests for 
comment.
    1. EPA is requesting public comment on all elements of the proposed 
regulatory action and the primary alternative regulatory action.
    2. EPA is requesting public comment regarding the need for 
exemptions from the rule (and under what specific circumstances), 
including exemptions from the proposed regulatory action and the 
primary alternative regulatory action, pursuant to the provisions of 
TSCA section 6(g).
    3. EPA requests comment on information that would allow EPA to 
quantify the magnitude of avoided risk of fetal cardiac defects due to 
reductions in TCE exposure under the proposed rulemaking.
    4. EPA requests comment on whether EPA should promulgate 
definitions for each condition of use evaluated in the 2020 Risk 
Evaluation for TCE, and, if so, whether the descriptions in Unit 
III.B.1. are consistent with the conditions of use evaluated in the 
2020 Risk Evaluation for TCE and whether they provide a sufficient 
level of detail to improve the clarity and readability of the 
regulation.
    5. EPA requests comment on the proposed compliance dates for 
prohibitions of TCE manufacturing, processing, distribution in 
commerce, and use and whether additional time is needed, for example, 
for products to clear the channels of trade, or for implementing the 
use of substitutes; comments should include documentation such as the 
specific use of the chemical throughout the supply chain; concrete 
steps taken to identify, test, and qualify substitutes for those uses 
(including details on the substitutes tested and the specific 
certifications that would require updating); and estimates of the time 
required to identify, test, and qualify substitutes with supporting 
documentation. EPA also requests comment on whether these are the 
appropriate types of information for use in evaluating compliance 
requirements, and whether there are other considerations that should 
apply.
    6. As noted in Unit III.B.1.f., this proposal does not apply to any 
substance excluded from the definition of ``chemical substance'' under 
TSCA section 3(2)(B)(ii) through (vi). EPA requests comment on the 
impacts, if any, that a prohibition on the processing

[[Page 74776]]

of TCE into a formulation, mixture or reaction product in other 
chemical products and preparations, or other aspects of this proposal, 
may have on the production and availability of any pesticide or other 
substance excluded from the TSCA definition of ``chemical substance.''
    7. EPA requests comment on whether it should consider a de minimis 
level of TCE in formulations to account for impurities (e.g., 0.1% or 
0.5%) when finalizing the prohibitions described in Units V.A.1.b. and 
c., and, if so, information on and rationale for any level that should 
be considered de minimis.
    8. EPA requests comment on whether additional recordkeeping 
requirements are warranted or additional time would be needed, for 
example, to begin the phaseout of processing TCE as an intermediate for 
the manufacture of HFC-134a.
    9. EPA is seeking comment on the actions that manufacturers who 
process TCE for the production of HFC-134a would take as a result of 
the proposed phaseout in Unit V.A.1.d, and whether this would motivate 
a decision to cease manufacture earlier than they would otherwise under 
the AIM Act phase-down.
    10. EPA requests comment on whether the 270-day proposed compliance 
date is practicable, whether additional time is needed, for example, 
for a regulated entity to implement a change to their disposal 
processes or to transition to alternative disposal methods and what 
those alternative disposal methods would be, and their cost and 
feasibility.
    11. EPA is requesting comment on how entities could demonstrate 
that they are reducing exposures to the extent possible (including 
considerations for technological feasibility) and is also requesting 
comment on whether EPA's requirement should be that entities ensure 
that exposures are reduced below the ECEL, rather than to the extent 
possible or lowest achievable level.
    12. For the ECEL value of 0.0011 ppm, proposed as part of the WCPP, 
EPA requests comment on the use of TSCA section 6(c)(2) to tailor the 
risk management actions where necessary to protect PESS.
    13. EPA is requesting comment on the use of the ECEL value of 
0.0040 ppm in the WCPP in the alternative regulatory action.
    14. EPA is requesting comment on the selection of the fetal cardiac 
defects endpoint for the ECEL of 0.0011 ppm in the proposed regulatory 
action, rather than the immunotoxicity endpoint on which the 
unreasonable risk determination is based, which would result in an ECEL 
of 0.0040 ppm, as further detailed in Unit IV.A.
    15. EPA is requesting comment on personal air sampling devices that 
are capable of detecting indoor air TCE concentrations at or below the 
proposed ECEL action level of 0.00055 ppm (0.0029 mg/m\3\) with the 
requisite precision and accuracy.
    16. EPA is requesting comment on using OSHA Method 1001, which has 
a personal breathing zone limit of detection for TCE of 18 ppb, or 
0.018 ppm, to set an interim exposure limit of 0.036 ppm, with an 
action level of 0.018 ppm, as described further in Unit V.A.2.b.i.
    17. EPA requests comments regarding replacing the proposed 
prohibitions with compliance with the WCPP, in the instance that 
regulated entities are able to consistently demonstrate compliance with 
an ECEL through effective controls.
    18. EPA requests comment on the potential to develop future 
technologies (e.g., engineering controls, administrative controls, PPE) 
involving TCE for the conditions of use listed in Unit V.A.1.a., Unit 
V.A.1.d., and Unit V.A.3 that would facilitate successful 
implementation of the WCPP, including an ECEL of 0.0011 ppm for TCE, 
dermal protection, and ancillary requirements described in Unit IV.A.
    19. EPA requests comment on the feasibility of controlling worker 
exposures to TCE at or below the proposed ECEL, and the accuracy of 
detections measurements at this level.
    20. EPA requests comment on whether a phased approach to an ECEL is 
desirable; that is, an approach that would establish a timeframe for 
meeting the ECEL as well as a shorter timeframe for meeting a 
concentration level higher than the ECEL (but lower than the PEL) that 
is currently considered achievable. EPA welcomes data or information to 
demonstrate that meeting the proposed ECEL over a sustained period of 
time would be feasible and measurable.
    21. EPA requests comments that provide supported recommendations 
for one or more incremental exposure values and associated timelines 
for achieving the incremental exposure levels and the currently 
proposed ECEL of 0.0011 ppm, and comments that consider and provide 
information on the needed advancements in exposure monitoring methods, 
analytical methods, and exposure controls, including expected timelines 
for developing these capabilities.
    22. EPA requests comment on how owners and operators should 
identify the lowest achievable exposure level, what documentation would 
be needed to support that further reductions are not possible, and 
whether EPA should provide a definition of meeting the ECEL to the 
extent possible. Additionally, EPA requests comment on whether current 
monitoring methods are able to detect airborne concentrations at the 
ECEL and action level values. EPA expects that detection and adherence 
to extremely low-ppm levels of TCE may present challenges to some in 
the regulated community; therefore, EPA is also requesting comment on 
whether EPA should propose specific requirements following results 
indicating non-detectable concentrations of TCE (non-detects), or a 
requirement that a specific monitoring method be used.
    23. EPA is soliciting comment regarding an ECEL action level that 
is half the ECEL and any associated provisions related to the ECEL 
action level when the ECEL is significantly lower than the OSHA PEL. 
EPA is also soliciting comment on whether the ECEL action level should 
be aligned with the OSHA PEL action level (typically set at half the 
limit), due to the fact that PEL accounts for technological feasibility 
and the action level is not necessarily designed to be health 
protective. Since exposure below the ECEL would be health protective, 
EPA seeks comment on whether the action level should be set at a 
different value closer to the ECEL that would trigger increased 
monitoring to ensure that the ECEL is not exceeded, and whether 
technological feasibility should be considered in setting the action 
level..
    24. EPA requests comment on whether the action level should be set 
at a different value closer to the ECEL that would trigger increased 
monitoring to ensure that the ECEL is not exceeded, and whether 
technological feasibility should be considered in setting the action 
level.
    25. EPA is soliciting comments regarding the timing of the initial 
exposure monitoring so that it would be representative of all tasks 
involving TCE where exposures may approach the ECEL. EPA is also 
soliciting comments regarding use of area source monitoring instead of 
personal breathing zone as a representative sample of exposures.
    26. EPA requests comment on the timeframes for periodic monitoring 
outlined in Table 1 of Unit V.A.2.
    27. EPA is soliciting comment on requiring warning signs to 
demarcate regulated areas, such as the requirements found in OSHA's 
General Industry Standard for Beryllium.

[[Page 74777]]

    28. EPA is requesting comment on whether the owner or operator 
should be required to permit designated representatives of employees 
and other workers to enter regulated areas to observe exposure 
monitoring similar to typical OSHA Standard requirements, e.g., 29 CFR 
1910.1024(d)(7).
    29. EPA is requesting comment on whether there should be a 
requirement to replace cartridges or canisters after a certain number 
of hours, such as the requirements found in OSHA's General Industry 
Standard for 1,3-Butadiene, or a requirement for a minimum service life 
of non-powered air-purifying respirators such as the requirements found 
in OSHA's General Industry Standard for Benzene.
    30. EPA is requesting comment on whether the timeframe to provide 
PPE to exposed workers should be shorter (e.g., within two weeks after 
the receipt of any exposure monitoring that indicates exposure 
exceeding the ECEL), given the severity of the effect, as discussed in 
Unit V.A.2.
    31. EPA requests comment on the degree to which additional guidance 
related to use of gloves might be necessary. Additionally, EPA requests 
comment on whether EPA should incorporate additional dermal protection 
requirements into the exposure control plan or require consideration of 
the hierarchy of controls for dermal exposures.
    32. EPA is requesting comment on how owners and operators can 
engage with potentially exposed persons on the development and 
implementation of an exposure control plan and PPE program.
    33. EPA requests comment relative to the ability of owners or 
operators to conduct initial monitoring within 6 months after date of 
publication of the final rule in the Federal Register, and anticipated 
timeframes for any procedural adjustments (i.e., use of new 
technologies for personal breathing zone monitoring at extremely low-
ppm levels of TCE) needed to comply with the requirements outlined in 
Unit V.A.2., including establishment of a respiratory protection 
program and development of an exposure plan.
    34. EPA is requesting comment regarding the amount of time, if any, 
it would take the regulated community to develop a method to measure at 
or below the ECEL over an entire work shift. EPA is interested in what 
levels of detection are possible based on existing monitoring methods, 
justification for the timeframe of the specific steps needed to develop 
a more sensitive monitoring method, and any additional detailed 
information related to establishing a monitoring program to reliably 
measure TCE at or below the ECEL.
    35. EPA also requests comment relative to the ability of owners or 
operators to implement dermal protection within 6 months of publication 
of the final rule in the Federal Register, and anticipated timeframes 
for any procedural adjustments needed to comply with the requirements 
outlined in Unit V.A.2.
    36. EPA requests comment on whether 10 years is an appropriate 
timeframe for the TSCA section 6(g) exemption for industrial and 
commercial use of TCE as a processing aid for battery separator 
manufacturing (lead-acid and lithium battery separators).
    37. EPA requests comment on whether 50 years is an appropriate 
timeframe for the TSCA section 6(g) exemption for the industrial and 
commercial use of TCE as a laboratory chemical (specifically in lab use 
essential for essential laboratory activities), Specifically, EPA 
requests comment on the anticipated duration of TCE cleanup projects, 
and whether there will be projects that continue and require the use of 
TCE as a laboratory chemical for the analysis of contaminated soil, 
air, and water samples past 50 years.
    38. EPA requests comment on the TSCA section 6(g) exemption for 
continued emergency use of TCE in the furtherance of NASA's mission as 
described in Unit V.A.3.iii.a.vi, and whether any additional conditions 
of use should be included, in particular for any uses qualified for 
space flight for which no technically or economically feasible safer 
alternative is available. Additionally, EPA requests comment on what 
would constitute sufficient justification of an emergency.
    39. EPA requests comments on the appropriateness of identified 
compliance timeframes for recordkeeping and downstream notification 
requirements described in Unit V.A.2.
    40. EPA requests comment on the primary alternative regulatory 
action and whether any elements of this primary alternative regulatory 
action described in Unit IV.B. should be considered as EPA develops the 
final regulatory action. EPA also requests comment on the 
practicability of the timeframes under the primary alternative 
regulatory action outlined in Unit V.B. compared to the timeframes 
identified for the proposed regulatory action in Unit V.A.
    41. EPA requests comment on the practicability of the timeframes 
outlined for the phaseout of processing TCE as an intermediate for HFC-
134a manufacture in Unit V.B. compared to the timeframes identified for 
the proposed regulatory action in Unit V.A., including consideration of 
the need for manufacturing (including import), and distribution in 
commerce to continue during the period of the phaseout.
    42. EPA requests comment on the applicability to the private sector 
of proposed regulatory actions pertaining specifically to Federal 
agencies, namely industrial uses for DoD vessel requirements and for 
closed-loop batch vapor degreasing for rayon fabric scouring for rocket 
booster nozzle production. EPA requests comment on the extent to which 
the private sector would be affected by a prohibition on these uses.
    43. EPA requests comment on whether the three-year alternative 
timeline would be practicable or whether additional time is needed, for 
example, for a regulated entity to implement a change to their 
wastewater collection, treatment, or disposal processes or 
infrastructure, and what those alternative disposal methods may be.
    44. EPA requests comment on the ability of regulated entities to 
conduct initial monitoring within 12 months, anticipated timeframes for 
any procedural adjustments needed to comply with the requirements, and 
the extent to which this option could result in additional exposure, 
compared to the proposed regulatory option as described in Unit V.A.
    45. EPA requests comment on the practicability of the timeframes 
outlined in this unit, when compared to the timeframes identified for 
the proposed regulatory action in Unit V.A. EPA requests comment on 
whether any elements of the primary alternative regulatory action 
described in this unit should be considered as EPA develops the final 
regulatory action, e.g., whether EPA should consider the timeframes for 
implementation of a WCPP presented in this primary alternative 
regulatory action and the ECEL value presented in the proposed 
regulatory action.
    46. EPA requests comment on the existing practices (e.g., 
engineering controls, administrative controls, PPE) involving TCE use 
in these conditions of use, as to whether activities may take place in 
closed systems and the degree to which users of TCE in these sectors 
could successfully implement an ECEL of 0.0011 ppm or an ECEL of 0.0040 
ppm as an 8-hour TWA, dermal protection, and ancillary requirements 
described in Units V.A.2. and V.B.2.
    47. EPA requests comment on the extent to which the use of TCE for 
vapor

[[Page 74778]]

degreasing of narrow tubing is a critical use for which no technically 
and economically feasible safer alternative is available.
    48. EPA therefore requests comment on the Agency's consideration of 
an exemption from the prohibition on disposal of TCE by industrial pre-
treatment, industrial treatment, or publicly owned treatment works for 
cleanup projects undertaken under the authority of CERCLA, RCRA, or 
other federal, state, or local government environmental laws, 
regulations, or requirements.
    49. EPA requests comment on whether 50 years is a reasonable 
timeframe for a TSCA section 6(g)(1)(A) exemption for the cleanup of 
TCE-contaminated water and groundwater sites. Specifically, EPA 
requests comment on the anticipated duration of TCE cleanup projects, 
and whether there will be projects that may continue and require the 
disposal of TCE to industrial pre-treatment, industrial treatment, or 
publicly owned treatment works beyond 25 years.
    50. EPA requests comment on whether industry anticipates increased 
releases of TCE to outdoor air associated with the implementation of 
the WCPP. EPA requests comment on whether owners and operators should 
be required to attest in their exposure control plan that engineering 
controls selected do not increase emissions of TCE to ambient air 
outside of the workplace and document in their exposure control plan 
whether additional equipment was installed to capture emissions of TCE 
to ambient air. EPA requests comment on how such a requirement could 
impact the availability, feasibility, or cost of engineering controls 
as a means to reduce workplace exposures to or below the proposed ECEL. 
EPA is also soliciting comment on the frequency and nature of air 
monitoring EPA should consider including as requirements in the final 
rule.
    51. EPA requests comments on all aspects of the TSCA section 6(g) 
exemptions described in Units V.A.3. and V.B.3., including whether 
compliance with the WCPP should also be required during the period of 
the exemption.
    52. EPA is soliciting comment on if the exemption for laboratory 
use of TCE as described in Unit V.A.3.a.iii should include lab use of 
TCE for research and development purposes for objectives broader than 
cleanup activities or exposure monitoring, such as research into TCE 
alternatives, whether these broader objectives should be limited to 
federal agencies and their contractors or expanded to include others, 
and whether a shorter time period, such as 10 years, should be imposed 
on these broader research and development activities.
    53. EPA is soliciting comment on whether it should specify the type 
of batch vapor degreasing operation, such as open-top or closed loop 
batch vapor degreasing, that would be exempt from prohibition as part 
of the primary alternative regulatory action for the industrial and 
commercial use of TCE in batch vapor degreasing for essential aerospace 
parts and narrow tubing used in medical devices and whether EPA should 
consider different exemption timeframes for different types of vapor 
degreasing operations.
    54. EPA requests comments on subsections of conditions of use, 
which by nature of their infrequent occurrence, could meet the ECEL 
without having their employees wear high APF levels of PPE on a daily 
basis.
    55. EPA requests public comment on the rationale for proposing 
prohibitions as the preferred risk management approach. In addition, 
EPA requests comment regarding the number of businesses and other 
entities that could potentially close as well as associated costs with 
a prohibition of TCE for the industrial and commercial conditions of 
use identified in Unit V.A.1.
    56. EPA requests comment on the effectiveness of a limited access 
program, such as a point-of-sale self-certification or other 
administrative controls, to address the unreasonable risk of TCE, in 
particular for facilities with occupational exposures to TCE that may 
not be able to meet the WCPP requirements of this proposed rulemaking.
    57. EPA is soliciting comments on whether there are products in use 
or available for sale relevant to these conditions of use that contain 
TCE at this time, so that EPA can ascertain whether there are 
alternatives that benefit human health or the environment as compared 
to such use of TCE.
    58. EPA is requesting comment on the Alternatives Assessment as a 
whole.
    59. EPA is requesting public comment on an issue raised in its TSCA 
section 9(a) Analysis described in Unit VIII.A., (i.e., the sufficiency 
of an action taken under a Federal law not administered by EPA).
    60. Following Panel report recommendations (Ref. 32) and in 
response to input provided by SERs, EPA is requesting comment on the 
following topics as outlined in the SBAR Panel Report:
     EPA requests public comment on the extent to which a 
regulation under TSCA section 6(a) could minimize requirements, such as 
testing and monitoring protocols, recordkeeping, and reporting 
requirements, which may exceed those already required under OSHA's 
regulations for TCE.
     EPA requests public comment on reasonable compliance 
timeframes for small businesses, specifically on whether and how to 
provide longer compliance timeframes for transitioning to alternatives 
for uses requiring reformulation and cleaning processes for cleaning 
parts for national defense or cleaning medical devices.
     EPA requests public comment on differing compliance or 
reporting requirements or timetables that account for the resources 
available to small entities.
     EPA requests public comment on any additional appropriate 
factors for identifying reasonable compliance timeframes and how to 
weigh the factors for vapor degreasing and other industries.
     EPA requests public comment the feasibility of entities 
complying with and monitoring for a potential ECEL of either 0.0011 ppm 
or 0.0040 ppm, specifically regarding potential costs that could be 
incurred using strategies to meet the requirements of such a standard, 
such as engineering, administrative, or prescriptive controls and how 
feasible it would be for entities to implement these strategies in 
their operations.
     EPA requests public comment on the feasibility of use of 
alternatives to TCE and their availability for conditions of use that 
drive the unreasonable risk.
     EPA requests public comment on a training and 
certification program for a commercial user to obtain a TCE-containing 
product from a retailer, such as industrial supply stores or online 
retailers.
     EPA requests public comment on a de minimis level in the 
case of an impurity or trace amounts of TCE in products.
     EPA requests public comment on whether to allow the use of 
TCE by entities that could, based on demonstrated ability through 
monitoring data, meet the ECEL under a workplace chemical protection 
program.
     EPA requests public comment on how the rulemaking should 
consider TCE alternatives in light of ongoing regulatory scrutiny.
     EPA requests public comment on whether chemicals 
undergoing risk evaluation would be likely to be

[[Page 74779]]

considered as viable alternatives and, if so, in which circumstances.
     EPA requests public comment on potential challenges 
associated with monitoring TCE below 0.0011 ppm and 0.0040 ppm.
     EPA requests public comment on whether the use of TCE in a 
closed-loop vapor degreasing system, when combined with requirements of 
a potential workplace chemical protection program, could meet the ECELs 
for TCE.

X. References

    The following is a listing of the documents that are specifically 
referenced in this document. The docket includes these documents and 
other information considered by EPA, including documents that are 
referenced within the documents that are included in the docket, even 
if the referenced document is not itself physically located in the 
docket. For assistance in locating these other documents, please 
consult the person listed under FOR FURTHER INFORMATION CONTACT.

1. EPA. Risk Evaluation for Trichloroethylene. EPA Document 
#740R18008. November 2020.
2. EPA. Final Revised Unreasonable Risk Determination for 
Trichloroethylene, Section 5. December 2022.
3. EPA. Economic Analysis of the Proposed Regulation of 
Trichloroethylene. 2023.
4. EPA. Phasedown of Hydrofluorocarbons: Establishing the Allowance 
Allocation and Trading Program Under the American Innovation and 
Manufacturing Act; Final Rule. October 5, 2021.
5. A. Tinker et al. Inpatient Hospitalization Costs Associated with 
Birth Defects Among Persons of All Ages--United States, 2013. MMWR. 
Morbidity and mortality weekly report vol. 66,2 41-46. January 20, 
2017.
6. M. Chen et al. Children with Heart Conditions and Their Special 
Health Care Needs--United States, 2016. MMWR. Morbidity and 
mortality weekly report vol. 67,38 1045-1049. 28. Sept. 28, 2018.
7. N. McClung et al. Financial burdens and mental health needs in 
families of children with congenital heart disease. Congenital heart 
disease 13.4 (2018): 554-562. April 6, 2018.
8. EPA. ChemView: Trichloroethylene (TCE), 79-01-6. Last updated on 
June 2, 2023. https://chemview.epa.gov/chemview/?tf=0&ch=79-01-6&su=256737574985&as=31098∾=115166378999&ma=4-11-1981377-4_16848473-4_16848474-4_49007566&gs=&tds=0&tdl=10&tas1=1&tas2=asc&tas3=undefined&tss=&modal=detail&modalId=100616&modalSrc=2-5-10-1-6378999-4-11-1981377.
9. EPA. Summary of EPA Regulations Pertaining to Trichloroethylene 
(TCE); and Other Federal, State, and International Regulations. 
September 2023.
10. OSHA. Standard Interpretations: 8-hr total weight average (TWA) 
permissible exposure limit (PEL). December 18, 2003. https://www.osha.gov/laws-regs/standardinterpretations/2003-12-18-1.
11. EPA. Trichloroethylene (TCE); Revision to the Toxic Substances 
Control Act (TSCA) Risk Determination; Notice of Availability. 
Federal Register (88 FR 1222, January 9, 2023) (FRL-9945-02-OCSPP).
12. NIOSH. Hierarchy of Controls. Last Reviewed January 17, 2023. 
https://www.cdc.gov/niosh/topics/hierarchy/.
13. EPA. Second Existing Chemical Exposure Limit (ECEL) 
(Developmental Toxicity) for Occupational Use of Trichloroethylene. 
March 31, 2022.
14. EPA. Existing Chemical Exposure Limit (ECEL) for Occupational 
Use of Trichloroethylene. February 22, 2021.
15. AFL-CIO v. OSHA, 965 F.2d 962 (11th Cir. 1992).
16. ACGIH. ACGIH TLVs. n.d. https://www.acgih.org/trichloroethylene/.
17. NIOSH. NIOSH Pocket Guide to Chemical Hazards--
Trichloroethylene. Last Reviewed October 30, 2019. https://www.cdc.gov/niosh/npg/npgd0629.html.
18. NIOSH. Appendix A--NIOSH Potential Occupational Carcinogens. 
Last Reviewed October 17, 2018. https://www.cdc.gov/niosh/npg/nengapdxa.html.
19. State of California Department of Industrial Relations. Table 
AC-1 Permissible Exposure Limits For Chemical Contaminants. n.d. 
https://www.dir.ca.gov/title8/5155table_ac1.html.
20. NIOSH. Recommendations for Occupational Safety and Health. 
January 1992.
21. Executive Order 13985. Advancing Racial Equity and Support for 
Underserved Communities Through the Federal Government. Federal 
Register (86 FR 7009, January 20, 2021).
22. Executive Order 13990. Protecting Public Health and the 
Environment and Restoring Science to Tackle the Climate Crisis. 
Federal Register (86 FR 7037, January 25, 2021).
23. Executive Order 14008. Tackling the Climate Crisis at Home and 
Abroad. Federal Register (86 FR 7619, February 1, 2021).
24. EPA. EPA Announces Path Forward for TSCA Chemical Risk 
Evaluations. June 30, 2021. https://www.epa.gov/newsreleases/epa-announces-path-forward-tsca-chemical-risk-evaluations.
25. EPA. TSCA Science Advisory Committee on Chemicals Meeting 
Minutes and Final Report. March 24-27, 2020.
26. EPA. Notes from Federalism Consultation on Forthcoming Proposed 
Rulemakings for Trichloroethylene, Perchloroethylene, and n-
methylpyrrolidone under TSCA Section 6(a). July 22, 2021.
27. EPA. Notes from Tribal Consultations on Forthcoming Proposed 
Rulemakings for Trichloroethylene (TCE) and Perchloroethylene (PCE). 
June 15 and July 8, 2021.
28. W. Heiger-Bernays and G. Nielsen. Environmental Justice 
Consultation Comment 1 for TCE and PCE. July 5, 2021.
29. S. Rayasam. Environmental Justice Consultation Comment 2 for TCE 
and PCE. June 16, 2021.
30. S. Liu. Environmental Justice Consultation Comment 3 for TCE and 
PCE. August 20, 2021.
31. EPA. Notes from Environmental Justice Consultations on 
Forthcoming Proposed Rulemakings for Trichloroethylene (TCE) and 
Perchloroethylene (PCE). July 2021.
32. Small Business Advocacy Review Panel. Final Report of the Small 
Business Advocacy Review Panel on EPA's Planned Proposed Rule for 
Trichloroethylene (TCE). April 4, 2023.
33. EPA. Initial Regulatory Flexibility Analysis (IRFA) for Proposed 
Regulation of Trichloroethylene.
34. EPA. Public Webinar on Trichloroethylene (TCE): Risk Evaluation 
and Risk Management under TSCA Section 6. December 15, 2020.
35. EPA. Stakeholder Meeting List for Proposed Rulemaking for 
Trichloroethylene under TSCA Section 6(a). May 19, 2023.
36. EPA. 2021 Policy on Children's Health. October 5, 2021.
37. EPA. Problem Formulation of the Risk Evaluation for 
Trichloroethylene. May 2018.
38. EPA. Scope of the Risk Evaluation for Trichloroethylene. June 
2017.
39. EPA. Final Scope of the Risk Evaluation for 1,2-Dichloroethane. 
August 2020.
40. EPA. Asbestos Part 1: Chrysotile Asbestos; Regulation of Certain 
Conditions of Use Under Section 6(a) of the Toxic Substances Control 
Act (TSCA). April 12, 2022.
41. EPA. Guidelines for Carcinogen Risk Assessment. March 2005.
42. EPA. Trichloroethylene (TCE); Revision to Toxic Substances 
Control Act (TSCA) Risk Determination; Respone to Public Comments. 
December 2022.
43. NASA. Solid Rocket Motor Nozzles Mission Critical Requirement 
for Trichloroethylene. February 1, 2023.
44. OSHA. Occupational Exposure to Methylene Chloride. January 10, 
1997.
45. EPA. Passive Samplers for Investigations of Air Quality: Method 
Description, Implementation, and Comparison to Alternative Sampling 
Methods. December 2014.
46. EPA. Second Existing Chemical Exposure Limit (ECEL) 
(Developmental Toxicity) for Occupational Use of Trichloroethylene; 
Appendix B. March 31, 2022.
47. OSHA. Personal Protective Equipment. 2023.
48. ENTEK. ENTEK International LLC, Request for Section 6(g) 
Exemption. July 14, 2021.
49. Microporous. Microporous LLC (``Microporous''), Request for 
Section 6(g) Exemption. August 10, 2022.
50. Battery Council International. Letter in Support of ENTEK 
Request for Section 6(g) Exemption for Battery Separator 
Manufacturing. September 3, 2021.

[[Page 74780]]

51. The Federal Consortium for Advanced Batteries. Executive Summary 
National Blueprint For Lithium Batteries 2021-2030. June 2021.
52. ENTEK. Analysis of Alternatives for the use of trichloroethylene 
as an extraction solvent for removal of process oil and formation of 
the porous structure in polyethylene based separators used in lead-
acid batteries. August 2021.
53. EPA. Assistant Administrator Meeting with ENTEK on a TSCA 
Section 6(g) Exemption Request in Risk Management for 
Trichloroethylene (TCE). February 15, 2022.
54. ENTEK. Attachment B to July 14, 2021 Letter From ENTEK EPA.
55. European Chemical Agency. Adopted opinions and previous 
consultations on applications for authorisation. n.d. https://echa.europa.eu/applications-for-authorisation-previous-consultations/-/substance-rev/6385/term; https://echa.europa.eu/applications-for-authorisation-previous-consultations/-/substance-rev/6384/term.
56. NASA. Known Uses of Trichloroethylene. December 14, 2022.
57. K. Black. The Nuclear Asphalt Content Gauge. 1995. https://highways.dot.gov/public-roads/winter-1995/nuclear-asphalt-content-gauge.
58. U.S. Department of State. A Strategic Framework for Space 
Diplomacy. May 25, 2023.
59. M. Finckenor. Materials for Spacecraft. NASA. 2016.
60. The Boeing Company. Comments Supporting Request for Additional 
Information on Trichloroethylene (TCE); Rulemaking Under TSCA 
Section 6(a). May 6, 2022.
61. The Boeing Company. Comments Concerning Trichloroethylene (TCE); 
Regulation of Use in Vapor Degreasing Under TSCA Section 6(a). May 
19, 2017.
62. The Boeing Company. Information on FAA Certification. December 
9, 2022.
63. 3M. 3M to Exit PFAS Manufacturing by the End of 2025. December 
20, 2022. https://news.3m.com/2022-12-20-3M-to-Exit-PFAS-Manufacturing-by-the-End-of-2025.
64. Viant. Viant Comments on the November 2020 TCE Risk Evaluation. 
November 17, 2021.
65. EPA. Meeting Summary--EPA Visit at the Integer facility in 
Minneapolis, MN. October 19, 2017.
66. EPA. National Air Emission Standards for Hazardous Air 
Pollutants: Halogenated Solvent Cleaning. May 3, 2007.
67. PPG. PPG TSCA Section 6(g) Exemption Request. June 29, 2023.
68. EPA. Trichloroethylene (TCE); Regulation of Use in Vapor 
Degreasing Under TSCA Section 6(a). Federal Register. (82 FR 7432, 
January 19, 2017)(FRL-9950-08).
69. NIOSH. NIOSH Guide to the Selection and Use of Particulate 
Respirators. January 1996. https://www.cdc.gov/niosh/docs/96-101/default.html.
70. Arkema. Arkema Inc. Comments on Draft Toxic Substances Control 
Act (TSCA) Risk Evaluation and TSCA Science Advisory Committee on 
Chemicals (SACC) Meetings. April 27, 2020.
71. EPA. Alternatives Assessment for Proposed Regulation of 
Trichloroethylene.
72. EPA. Meeting with Safechem on Risk Management under TSCA Section 
6(a) for Trichloroethylene. March 23, 2023.
73. Koura. Production of R-134a. 2017.
74. National Cleaners Association. National Cleaners Association 
Comments on the Phaseout of Trichloroethylene (TCE). February 13, 
2023.
75. Axiall. Safety Data Sheet for Trichlorethylene. October 26, 
2013.
76. EPA. EPA Response to Letter of Concern from Louisiana Department 
of Environmental Quality's (LDEQ) and the Louisiana Department of 
Health (LDH). October 12, 2022.
77. EPA. Memorandum Trichloroethylene (TCE): Fenceline Technical 
Support--Ambient Air Pathway. March 3, 2022.
78. EPA. Draft TSCA Screening Level Approach for Assessing Ambient 
Air and Water Exposures to Fenceline Communities. January 2022.
79. EPA. Memorandum Trichloroethylene: Fenceline Technical Support--
Water Pathway. March 24, 2023.
80. OMB. Memorandum for Guidance for Implementing Title II of the 
Unfunded Mandates Reform Act (UMRA). March 31, 1995.
81. CPSC. Statutes. n.d. https://www.cpsc.gov/Regulations-Laws--Standards/Statutes.
82. EPA. Supporting Statement for an Information Collection Request 
(ICR) Under the Paperwork Reduction Act (PRA); Regulation of 
Trichloroethylene under TSCA Section 6(a); Proposed Rule (RIN 2070-
AK83). EPA ICR No. 2775.01. September 2023.

XI. Statutory and Executive Order Reviews

    Additional information about these statutes and Executive Orders 
can be found at https://www.epa.gov/laws-regulations/laws-and-executive-orders.

A. Executive Orders 12866: Regulatory Planning and Review and 14094: 
Modernizing Regulatory Review

    This action is a ``significant regulatory action'' as defined in 
Executive Order 12866 (58 FR 51735, October 4, 1993), as amended by 
Executive Order 14094 (88 FR 21879, April 11, 2023). Accordingly, EPA 
submitted this action to OMB for Executive Order 12866 review. 
Documentation of any changes made in response to the Executive Order 
12866 review is available in the docket. EPA prepared an economic 
analysis (Ref. 3) of the potential costs and benefits associated with 
this action, which is available in the docket and is summarized in Unit 
VI.D.

B. Paperwork Reduction Act (PRA)

    The information collection activities in this proposed rule have 
been submitted to OMB under the PRA, 44 U.S.C. 3501 et seq. The 
Information Collection Request (ICR) document that EPA prepared has 
been assigned EPA ICR No. 2775.01 (Ref. 82). You can find a copy of the 
ICR in the docket for this rulemaking, and it is briefly summarized 
here.
    There are two primary provisions of the proposed rule that may 
increase burden under the PRA. The first is downstream notification, 
which would be carried out by updates to the relevant SDS and which 
would be required for manufacturers, processors, and distributors in 
commerce of TCE, who would provide notice to companies downstream upon 
shipment of TCE about the prohibitions. The information submitted to 
downstream companies through the SDS would provide knowledge and 
awareness of the restrictions to these companies. The second primary 
provision of the proposed rule that may increase burden under the PRA 
is WCPP-related information generation, recordkeeping, and notification 
requirements (including development of exposure control plans; exposure 
level monitoring and related recordkeeping; development of 
documentation for a PPE program and related recordkeeping; development 
of documentation for a respiratory protection program and related 
recordkeeping; development and notification to potentially exposed 
persons (employees and others in the workplace) about how they can 
access the exposure control plans, exposure monitoring records, PPE 
program implementation documentation, and respirator program 
documentation; and development of documentation demonstrating 
eligibility for an exemption from the proposed prohibitions, and 
related recordkeeping).
    Respondents/affected entities: Persons that manufacture (including 
import), process, distribute in commerce, use, or dispose of TCE or 
products containing TCE. See also Unit I.A.
    Respondent's obligation to respond: Mandatory (TSCA section 6(a) 
and 40 CFR part 751).
    Estimated number of respondents: 22,113.
    Frequency of response: On occasion.
    Total estimated burden: 12,197 hours (per year). Burden is defined 
at 5 CFR 1320.3(b).
    Total estimated cost: $1,702,625 (per year), includes $722,586 
annualized capital or operation and maintenance costs.
    An agency may not conduct or sponsor, and a person is not required 
to respond to, a collection of information

[[Page 74781]]

unless it displays a currently valid OMB control number. The OMB 
control numbers for certain EPA regulations in 40 CFR are listed in 40 
CFR part 9 and displayed on the form and instructions or collection 
portal, as applicable.
    Submit your comments on the Agency's need for this information, the 
accuracy of the provided burden estimates, and any suggested methods 
for minimizing respondent burden to the EPA using the docket identified 
at the beginning of this proposed rule. EPA will respond to ICR-related 
comments in the final rule. You may also send your ICR-related comments 
to OMB's Office of Information and Regulatory Affairs using the 
interface at https://www.reginfo.gov/public/do/PRAMain. Find this 
particular ICR by selecting ``Currently under Review--Open for Public 
Comments'' or by using the search function. OMB must receive comments 
no later than November 30, 2023.

C. Regulatory Flexibility Act (RFA)

    Pursuant to section 603 of the RFA, 5 U.S.C. 601 et seq., EPA 
prepared an initial regulatory flexibility analysis (IRFA) (Ref. 33) 
that examines the impact of the proposed rule on small entities along 
with regulatory alternatives that could minimize that impact. The 
complete IRFA is available for review in the docket and is summarized 
here.
1. Need for the Rule
    Under TSCA section 6(a) (15 U.S.C. 2605(a)), if EPA determines 
after a TSCA section 6(b) risk evaluation that a chemical substance 
presents an unreasonable risk of injury to health or the environment, 
without consideration of costs or other nonrisk factors, including an 
unreasonable risk to a PESS identified as relevant to the risk 
evaluation, under the conditions of use, EPA must by rule apply one or 
more requirements listed in TSCA section 6(a) to the extent necessary 
so that the chemical substance or mixture no longer presents such risk. 
TCE was the subject of a risk evaluation under TSCA section 6(b)(4)(A) 
that was issued in November 2020. In addition, in January 2023, EPA 
issued a revised unreasonable risk determination that TCE as a whole 
chemical substance presents an unreasonable risk of injury to health 
under the conditions of use. As a result, EPA is proposing to take 
action to the extent necessary so that TCE no longer presents such 
risk.
2. Objectives and Legal Basis
    Under TSCA section 6(a) (15 U.S.C. 2605(a)), if EPA determines 
through a TSCA section 6(b) risk evaluation that a chemical substance 
presents an unreasonable risk of injury to health or the environment, 
EPA must by rule apply one or more requirements listed in TSCA section 
6(a) to the extent necessary so that the chemical substance or mixture 
no longer presents such risk. EPA has determined through a TSCA section 
6(b) risk evaluation that TCE presents an unreasonable risk under the 
conditions of use.
3. Description and Number of Small Entities to Which the Rule Will 
Apply
    The proposed rule potentially affects small manufacturers 
(including importers), processors, distributors, retailers, users of 
TCE or of products containing TCE, and entities engaging in disposal. 
EPA estimates that the proposal would affect approximately 22,113 
overall firms, of which 21,571 small entities have estimated impacts. 
End users with economic and technologically feasible alternatives are 
estimated to only incur costs associated with rule familiarization.
4. Projected Compliance Requirements
    To address the unreasonable risk EPA has identified, EPA is 
proposing to: Prohibit the manufacture (including import), processing, 
and distribution in commerce of TCE for all uses (including all 
consumer uses), with longer timeframes for manufacture and processing 
related to certain uses; prohibit the industrial and commercial use and 
distribution in commerce of TCE, with longer timeframes for certain 
uses; prohibit the manufacture (including import) and processing of TCE 
as an intermediate for the manufacture of HFC 134-a, following an 8.5-
year phaseout; prohibit the industrial and commercial use of TCE as a 
solvent for closed-loop batch vapor degreasing for rayon fabric 
scouring for end use in rocket booster nozzle production by Federal 
agencies and their contractors, following a 10-year phaseout; prohibit 
the manufacturing (including import), processing, distribution in 
commerce, and use of TCE as a processing aid for battery separator 
manufacturing following a 10-year TSCA section 6(g) exemption; prohibit 
the manufacturing (including import), processing, distribution in 
commerce, and use of TCE as a laboratory chemical (specifically in lab 
use essential for essential laboratory activities) following a 50-year 
TSCA section 6(g) exemption; Require strict workplace controls, 
including a TCE workplace chemical protection program (WCPP), which 
would include requirements for an inhalation exposure limit and glove 
requirements to limit dermal exposure to TCE, for conditions of use 
with long term phaseouts or time-limited exemptions under TSCA section 
6(g); prohibit disposal to industrial pre-treatment, industrial 
treatment, or publicly owned treatment works following a 50-year TSCA 
section 6(g) exemption for cleanup projects; and establish 
recordkeeping and downstream notification requirements.
    EPA is proposing to prohibit all conditions of use. EPA is 
proposing longer timeframes (with workplace controls) for prohibitions 
on certain conditions of use. For the reasons described in Unit V., EPA 
notes that long-term implementation of the WCPP is not a feasible means 
of addressing unreasonable risk and that prohibition of the COUs is 
ultimately necessary to address the unreasonable risk. Furthermore, 
when selecting among proposed prohibitions and other restrictions that 
would apply to those occupational conditions of use, EPA has also 
factored in considerations relating to health effects on PESS, 
including older pregnant women (the group identified as most 
susceptible to fetal cardiac defects), further discussed in Unit VI.A. 
EPA is proposing a WCPP for several conditions of use of TCE in order 
to address to the extent possible the unreasonable risk during the time 
period before a prohibition becomes effective. The WCPP would include 
the ECEL, the associated implementation requirements, and may include 
other components, such as dermal protection.
    As described in Unit V.A., the TCE WCPP would be non-prescriptive, 
in the sense that regulated entities would not be required to use 
specific controls prescribed by EPA to achieve the exposure 
concentration limit. Rather, it would be a performance-based exposure 
limit that would enable owners or operators to determine how to most 
effectively meet the exposure limit based on conditions at their 
workplace.
    A central component of the TCE WCPP is the exposure limit. 
Exposures remaining at or below the ECEL would address any unreasonable 
risk of injury to health driven by inhalation exposures for 
occupational conditions of use in the TSCA 2020 Risk Evaluation. For 
TCE, EPA is proposing an ECEL of 0.0011 parts per million (ppm) (0.0059 
mg/m\3\) for inhalation exposures to TCE as an 8-hour TWA. As discussed 
in Unit V.A.2.b.i., EPA acknowledges the challenges of complying with 
the WCPP due to suitable personal breathing zone monitoring methods to 
detect TCE air concentration levels at the ECEL, and requests comment 
on using OSHA

[[Page 74782]]

Method 1001 to set an interim exposure limit.
    Where elimination, substitution, engineering controls, and 
administrative controls are not feasible to reduce the air 
concentration to or below the ECEL for all potentially exposed persons, 
EPA is proposing to require implementation of a PPE program in 
alignment with OSHA's General Requirements for Personal Protective 
Equipment at 29 CFR 1910.132. Consistent with 29 CFR 1910.132, owners 
and operators would be required to provide PPE, including respiratory 
protection and dermal protection selected in accordance with the 
guidelines described in this unit, that is of safe design and 
construction for the work to be performed. EPA is proposing to require 
owners and operators ensure each potentially exposed person who is 
required by this unit to wear PPE to use and maintain PPE in a 
sanitary, reliable, and undamaged condition. Owners and operators would 
be required to select and provide PPE that properly fits each 
potentially exposed person who is required by this unit to use PPE and 
communicate PPE selections to each affected person.
    As described further in Unit VI., EPA believes that long-term 
implementation of the WCPP for continued use of TCE is not a feasible 
means of addressing unreasonable risk such that prohibition may 
ultimately be necessary to address the unreasonable risk.
    EPA is not proposing reporting requirements beyond downstream 
notification (third-party notifications). Regarding recordkeeping 
requirements, three primary provisions of the proposed rule relate to 
recordkeeping. The first is recordkeeping of general records: all 
persons who manufacture, process, distribute in commerce, or engage in 
industrial or commercial use of TCE or TCE-containing products must 
maintain ordinary business records, such as invoices and bills-of-
lading related to compliance with the prohibitions, restrictions, and 
other provisions of the regulation.
    The second is recordkeeping related to WCPP compliance: under the 
proposed regulatory action, facilities complying with the rule through 
the WCPP would be required to develop and maintain records associated 
with ECEL exposure monitoring (including measurements, compliance with 
Good Laboratory Practice Standards, and information regarding 
monitoring equipment); compliance with the ECEL or lowest achievable 
exposure level (including the exposure control plan, PPE program 
implementation, and workplace information and training); PPE compliance 
(including the exposure control plan, PPE program implementation, basis 
for specific PPE selection, and workplace information and training); 
and workplace participation. This would also include recordkeeping 
related to the exemptions proposed under TSCA section 6(g), which would 
provide longer compliance dates for entities engaged in specific 
activities with TCE for which prohibition in the short term would be 
disruptive to national security or critical infrastructure. To maintain 
eligibility for the time-limited exemptions, EPA is proposing that 
owners and operators maintain records demonstrating compliance with the 
specific conditions of the exemption, including compliance with the 
WCPP by meeting the ECEL to the extent possible. To support and 
demonstrate compliance, EPA is proposing that each owner or operator of 
a workplace subject to the WCPP retain compliance records for five 
years.
    The third is recordkeeping related to the phaseouts for processing 
TCE in manufacture of HFC-134a (for which each manufacturer of HFC-134a 
who uses TCE as an intermediate would be required to maintain 
production volume records demonstrating compliance with setting the 
baseline and the phaseout) or use as a solvent for closed-loop batch 
vapor degreasing for rayon fabric scouring (for which each person using 
TCE would be required to maintain records demonstrating that the end 
use is for rocket booster nozzle production for Federal agencies and 
their contractors and would, within five years, be required to maintain 
records that demonstrate that a final pre-launch test of rocket booster 
nozzles was completed without using TCE in the production of rocket 
booster nozzles for Federal agencies and their contractors).
a. Classes of Small Entities Subject to the Compliance Requirements
    The small entities that would be potentially directly regulated by 
this rulemaking are small entities that manufacture (including import), 
process, distribute in commerce, use, or dispose of TCE, including 
retailers of TCE for end-consumer uses.
b. Professional Skills Needed To Comply
    Entities that would be subject to this proposal that manufacture 
(including import), process, or distribute TCE in commerce would be 
required to cease under the proposed rule. The entity would be required 
to modify their SDS or develop another way to inform their customers of 
the prohibition on manufacture, processing, and distribution of TCE. 
They would also be required to maintain ordinary business records, such 
as invoices and bills-of-lading, that demonstrate compliance with the 
prohibitions, restrictions, and other provisions of this proposed 
regulation. These are all routine business tasks that do not require 
specialized skills or training.
    Entities that use TCE in any industrial and commercial capacity 
would be required to cease under the proposed rule, with some 
timeframes for prohibitions longer than others. Restriction or 
prohibition of these uses would likely require the implementation of an 
alternative chemical or the cessation of use of TCE in a process or 
equipment that may require persons with specialized skills, such as 
engineers or other technical experts. Instead of developing an 
alternative method themselves, commercial users of TCE may choose to 
contract with another entity to do so.
    Entities that would be permitted to continue on a time-limited 
basis until prohibition to manufacture, process, distribute, or use TCE 
would be required to implement a WCPP and would have to attempt to meet 
the provisions of the program to the extent possible for continued use 
of TCE. A transition to a WCPP may require persons with specialized 
skills such as an engineer or health and safety professional. Instead 
of implementing the WCPP to the extent possible, entities that use TCE 
may choose to contract with another entity to do so. Records would have 
to be maintained for compliance with a WCPP by meeting the ECEL to the 
extent possible. While this recording activity itself may not require a 
special skill, the information to be measured and recorded may require 
persons with specialized skills such as an industrial hygienist.
5. Relevant Federal Rules
    Because of its health effects, TCE is subject to numerous State, 
Federal, and international regulations restricting and regulating its 
use. The following is a summary of the regulatory actions pertaining to 
TCE; for a full description see appendix A of the 2020 Risk Evaluation 
for TCE and the summary in the docket (Ref. 9).
    EPA has published numerous rules and Federal Register documents 
pertaining to TCE under its various authorities.
    Under a Significant New Use Rule (SNUR), (81 FR 20535, April 8, 
2016), issued under the authority of TSCA section 5(a), TCE is subject 
to notifications for manufacture (including import) or processing of 
TCE for use in

[[Page 74783]]

a consumer product except for use in cleaners and solvent degreasers, 
film cleaners, hoof polishes, lubricants, mirror edge sealants and 
pepper spray. This SNUR ensures that EPA will have the opportunity to 
review any new consumer uses of TCE and, if appropriate, take action to 
prohibit or limit those uses.
    The TSCA section 8(a) Chemical Data Reporting (CDR) Rule requires 
manufacturers (including importers) to give EPA basic exposure-related 
information on the types, quantities and uses of chemical substances 
produced domestically and imported into the United States. TCE 
manufacturing (including importing), processing, and use information is 
reported under the CDR rule (76 FR 50816, August 16, 2011).
    TCE is a hazardous air pollutant under the CAA (42 U.S.C. 
7412(b)(1)). Under section 112(d), EPA has established national 
emission standards for hazardous air pollutants (NESHAPs) for a number 
of source-specific categories that emit TCE, including synthetic 
organic chemical manufacturing (40 CFR part 63, subparts F, G, and H), 
miscellaneous organic chemical manufacturing (40 CFR part 63, subpart 
FFFF), and aerospace manufacturing and rework facilities (40 CFR part 
63, subpart GG). Under sections 112(d) and 112(f), EPA has promulgated 
a number of risk and technology review (RTR) NESHAPs, including the RTR 
NESHAP for Halogenated Solvent Cleaning (40 CFR part 63, subpart T). 
With this proposed rule under TSCA section 6, uses and emissions 
already regulated under these NESHAPs would be prohibited, with some of 
these uses identified for a longer phaseout timeframe under TSCA 
section 6.
    Under the CAA section 612, EPA's Significant New Alternatives 
Policy (SNAP) program listed TCE as an acceptable substitute for methyl 
chloroform and chlorofluorocarbon (CFC)-113 in metals, electronics, and 
precision cleaning; as an alternative to CFC-11, CFC-113, methyl 
chloroform, and hydrochlorofluorocarbon (HCFC)-141b for aerosol solvent 
use; and as an alternative for methyl chloroform for use as a carrier 
solvent in adhesives, coatings, and inks (59 FR 13044, March 18, 1994). 
TCE was also noted to have essentially no ozone depletion potential and 
cited as a volatile organic compound (VOC)-exempt solvent and 
acceptable substitute for ozone-depleting substances (72 FR 30142, May 
30, 2007). TCE is also listed under the National Volatile Organic 
Compound Emission Standards for Aerosol Coatings (40 CFR part 59, 
subpart E). Under the American Innovation and Manufacturing Act (AIM 
Act) that directs EPA to phase down the production and consumption of 
HFCs, EPA set HFC production and consumption baseline levels from which 
reductions will be made (86 FR 55116, October 5, 2021). The rule also 
establishes an initial methodology for allocating and trading HFC 
allowances for 2022 and 2023. TCE is identified as a feedstock chemical 
for HFC production, specifically HFC-134a.
    TCE is designated as a toxic pollutant under section 307(a)(1) of 
the Clean Water Act and as such is subject to effluent limitations. 
Also under section 304, TCE is included in the list of total toxic 
organics (TTO) (40 CFR 413.02(i)). In 2015, EPA published updated 
ambient water quality criteria for TCE, including recommendations for 
``water + organism'' and ``organism only'' human health criteria for 
States and authorized tribes to consider when adopting criteria into 
their water quality standards (80 FR 36986, June 29, 2015). TCE is also 
subject to National Primary Drinking Water Regulations (NPDWR) under 
the Safe Drinking Water Act (SDWA) with a maximum contaminant level 
goal (MCGL) of zero and an enforceable maximum contaminant level (MCL) 
of 0.005 mg/L (40 CFR 141.50; 40 CFR 141.61).
    Programs within EPA implementing other environmental statutes, 
including, but not limited to, the RCRA, the Comprehensive 
Environmental Response, Compensation and Liability Act, the Safe 
Drinking Water Act, and the CWA, classify TCE as a characteristic and 
listed hazardous waste (40 CFR 261.24, 40 CFR 261.31, 40 CFR 
261.33(f)). In 2013, EPA modified its hazardous waste management 
regulations to conditionally exclude solvent-contaminated wipes that 
have been cleaned and reused from the definition of solid waste under 
RCRA and to conditionally exclude solvent-contaminated wipes that are 
disposed from the definition of hazardous waste (78 FR 46448, July 31, 
2013). However, TCE-contaminated wipes were not eligible for this 
exclusion due to health and safety concerns.
    EPA notes that TCE was first registered as an antimicrobial and 
conventional chemical in 1985 pursuant to the Federal Insecticide, 
Fungicide, and Rodenticide Act (FIFRA). TCE is not currently used in 
pesticides, either as an active or inert ingredient. While TCE was 
previously used as an inert, EPA removed TCE from its list of inert 
ingredients used in pesticide products in 1998 (63 FR 34384, June 24, 
1998).
    While TSCA shares equity in the regulation of TCE, EPA does not 
anticipate this rulemaking to duplicate nor conflict with the 
aforementioned programs' classifications and associated rules.
    In addition to EPA actions, TCE is also subject to other Federal 
regulations. Under the OSH Act, OSHA established the PEL for TCE at 100 
ppm as an 8-hour TWA with an acceptable ceiling concentration of 200 
ppm and an acceptable maximum peak above the acceptable ceiling 
concentration for an 8-hour shift of 300 ppm, maximum duration of 5 
minutes in any 2 hours (29 CFR 1910.1000). However, EPA recognizes that 
the existing PEL does not eliminate the unreasonable risk identified by 
EPA under TSCA, and EPA is therefore proposing prohibitions based on 
the unreasonable risk identified following the TSCA 2020 Risk 
Evaluation for TCE, with time-limited requirements to meet to the 
extent possible a new, lower exposure limit. The implementation of 
those requirements would align with existing OSHA requirements where 
possible. For TCE, this approach would eliminate the unreasonable risk 
driven by certain conditions of use, reduce burden for complying with 
the regulations, and provide the familiarity of a pre-existing 
framework for the regulated community.
    Under the FFDCA, the Food and Drug Administration established 
tolerances for residues of TCE resulting from its use as a solvent in 
the manufacture of decaffeinated coffee and spice oleoresins (21 CFR 
173.290). Under the Atomic Energy Act, the Department of Energy Worker 
Safety and Health Program requires its contractor employees to use the 
2005 ACGIH TLV for TCE, which is 10 ppm (8-hour TWA) and 25 ppm Short 
Term Exposure Limit. Under the Federal Hazardous Material 
Transportation Act, the Department of Transportation has designated TCE 
as a hazardous material, and there are special requirements for 
marking, labeling, and transporting it (49 CFR part 171, 49 CFR part 
172, 40 CFR 173.202, and 40 CFR 173.242).
6. Significant Alternatives to the Proposed Rule
    EPA analyzed alternative regulatory approaches to identify which 
would be feasible, reduce burden to small businesses, and achieve the 
objective of the statute (i.e., applying one or more requirements 
listed in TSCA section 6(a) to the extent necessary so that the 
chemical substance or mixture no longer presents an unreasonable risk). 
As

[[Page 74784]]

described in more detail in Unit V., EPA considered several factors, in 
addition to identified unreasonable risk, when selecting among possible 
TSCA section 6(a) requirements. To the extent practicable, EPA factored 
into its decisions: the effects of TCE on health and the environment, 
the magnitude of exposure to TCE of human beings and the environment, 
the benefits of TCE for various uses, and the reasonably ascertainable 
economic consequences of the rule. As part of this analysis, EPA 
considered--in addition to the prohibitions described in Unit V.--a 
wide variety of control measures to address the unreasonable risk from 
TCE such as a WCPP, weight fractions, a certification and limited 
access program, and prescriptive controls. EPA's analysis of these risk 
management approaches is detailed in Unit V.A.3. In general, EPA 
determined that these approaches alone would either not be able to 
address the unreasonable risk, or, in the case of a weight fraction 
limit, would result in a product containing so little TCE that it would 
have the effect of a prohibition.
    Additionally, in this proposed rule and the Economic Analysis, EPA 
has examined a primary alternative regulatory action. The primary 
alternative regulatory action described in this proposed rule and 
considered by EPA combines prohibitions and requirements for a WCPP. 
While in some ways it is similar to the proposed regulatory action, the 
primary alternative regulatory action described in this NPRM differs 
from the proposed regulatory action by providing longer timeframes for 
prohibitions and by describing an ECEL based on a different health 
endpoint (i.e., immunotoxicity), as part of the WCPP, for the 
conditions of use of TCE that would be permitted to continue for longer 
than 1 year after publication of the final rule until the prohibition 
compliance dates. The primary alternative regulatory action was 
considered and found to provide greater uncertainty in addressing the 
unreasonable risk from TCE under the conditions of use, resulting in 
EPA's proposed action. Estimated costs of the primary alternative 
regulatory action can be found in Chapter 7 of the Economic Analysis 
(Ref. 3).
    As indicated by this overview, and detailed in Unit VI.A., in the 
review of alternatives, EPA determined that some methods either did not 
effectively eliminate the unreasonable risk presented by TCE or, for 
many conditions of use, there was a high degree of uncertainty 
regarding whether compliance with a comprehensive WCPP would be 
possible to adequately protect potentially exposed persons. While EPA 
is soliciting comments about all aspects on the alternative regulatory 
actions, which may be incorporated into the final rulemaking, EPA has 
considered the primary alternative regulatory action and found that the 
proposed action is more suitable for addressing the unreasonable risk 
to the extent necessary so that TCE no longer presents such risk, while 
also allowing flexibility for regulated entities to continue operations 
under time-limited exemptions, as described in more detail in Units 
V.A. and VI.A.
    Regarding timeframes for compliance, as described in Units V.A.1., 
2., and 3., the proposed compliance dates incorporate EPA's 
consideration of sustained awareness of risks resulting from TCE 
exposure as well as precedent established by the OSHA standards (62 FR 
1494, January 10, 1997). TSCA requires that EPA propose timeframes that 
are ``as soon as practicable'' under TSCA section 6(d)(1)(B) and 
6(d)(1)(D). EPA has no information indicating that the proposed 
compliance dates are not practicable for the activities that would be 
prohibited, or that additional time is needed for products affected by 
the proposed restrictions to clear the channels of trade. As noted in 
Unit IX., EPA is seeking public comment on whether additional time is 
needed for compliance with prohibitions, for products to clear the 
channels of trade, or for implementing a WCPP. EPA may finalize shorter 
or longer compliance timeframes based on public comment. Regarding 
potential regulatory flexibilities for compliance dates and timeframes, 
EPA notes that the alternative regulatory action would include longer 
compliance timeframes for prohibitions. Given the potential severity of 
impacts from exposure to TCE, EPA's proposed regulatory action would 
include relatively rapid compliance timeframes. However, it is possible 
that longer timeframes would be needed for entities to come into 
compliance; therefore, the primary alternative regulatory action 
described in the proposed rule would include longer timeframes for 
implementation than the proposed regulatory action. These timeframes 
are detailed in Unit V.B.
    As required by section 609(b) of the RFA, the EPA also convened a 
SBAR Panel to obtain advice and recommendations from SERs that 
potentially would be subject to the rule's requirements. The SBAR Panel 
evaluated the assembled materials and small-entity comments on issues 
related to elements of an IRFA. A copy of the full SBAR Panel Report 
(Ref. 32) is available in the rulemaking docket.

D. Unfunded Mandates Reform Act (UMRA)

    This action does not contain a Federal mandate of $100 million or 
more as described in UMRA, 2 U.S.C. 1531-1538, and does not 
significantly or uniquely affect small governments. The action would 
affect entities that use TCE. It is not expected to affect State, 
local, or Tribal governments because the use of TCE by government 
entities is minimal. This action is not expected to result in 
expenditures by State, local, and Tribal governments, in the aggregate, 
or by the private sector, of $100 million or more (when adjusted 
annually for inflation) in any 1 year. Accordingly, this action is not 
subject to the requirements of sections 202, 203, or 205 of UMRA.

E. Executive Order 13132: Federalism

    EPA has concluded that this action has federalism implications as 
specified in Executive Order 13132 (64 FR 43255, August 10, 1999), 
because regulations under TSCA section 6(a) may preempt State law. As 
set forth in TSCA section 18(a)(1)(B), the issuance of rules under TSCA 
section 6(a) to address the unreasonable risk presented by a chemical 
substance has the potential to trigger preemption of laws, criminal 
penalties, or administrative actions by a State or political 
subdivision of a State that are: (1) Applicable to the same chemical 
substance as the rule under TSCA section 6(a); and (2) Designed to 
prohibit or otherwise restrict the manufacture, processing, or 
distribution in commerce or use of that same chemical. TSCA section 
18(c)(3) applies that preemption only to the ``hazards, exposures, 
risks, and uses or conditions of use'' of such chemical included in the 
final TSCA section 6(a) rule.
    EPA provides the following preliminary federalism summary impact 
statement. The Agency consulted with State and local officials early in 
the process of developing the proposed action to permit them to have 
meaningful and timely input into its development. This included 
background presentation on September 9, 2020, and a consultation 
meeting on July 22, 2021. EPA invited the following national 
organizations representing State and local elected officials to these 
meetings: Association of State Drinking Water Administrators, National 
Association of Clean Water Agencies, Western States Water Council, 
National Water Resources Association, American Water Works Association, 
Association of Metropolitan Water Agencies,

[[Page 74785]]

Association of Clean Water Administrators, Environmental Council of the 
States, National Association of Counties, National League of Cities, 
County Executives of America, U.S. Conference of Mayors, and National 
Association of Attorneys General. As described in Unit III.A.1., during 
the meeting participants and EPA discussed preemption; the authority 
given under TSCA section 6 to regulate identified unreasonable risk; 
which activities would be potentially regulated in the proposed rule; 
TSCA reporting requirements; key local constituencies; and the 
relationship between TSCA and existing statutes, particularly the CWA 
and SDWA. A summary of the meeting with these organizations, including 
the views that they expressed, is available in the docket (Ref. 26). 
EPA provided an opportunity for these organizations to provide follow-
up comments in writing but did not receive any such comments.

F. Executive Order 13175: Consultation and Coordination With Indian 
Tribal Governments

    This action does not have Tribal implications as specified in 
Executive Order 13175 (65 FR 67249, November 9, 2000), because it will 
not have substantial direct effects on Tribal governments, on the 
relationship between the Federal Government and the Indian Tribes, or 
on the distribution of power and responsibilities between the Federal 
Government and Indian Tribes. This rulemaking would not have 
substantial direct effects on Tribal government because TCE is not 
manufactured, processed, or distributed in commerce by Tribes. TCE is 
not regulated by Tribes, and this rulemaking would not impose 
substantial direct compliance costs on Tribal governments. Thus, 
Executive Order 13175 does not apply to this action.
    Consistent with the EPA Policy on Consultation and Coordination 
with Indian Tribes, EPA consulted with Tribal officials during the 
development of this action. The Agency held a Tribal consultation from 
May 17, 2021, to August 20, 2021, with meetings on June 15, 2021, and 
July 8, 2021. Tribal officials were given the opportunity to 
meaningfully interact with EPA risk managers concerning the current 
status of risk management. During the consultation, EPA discussed risk 
management under TSCA section 6(a). EPA risk managers briefed Tribal 
officials on the Agency's risk management considerations and Tribal 
officials raised issues and concerns. Issues raised by Tribal officials 
included concerns from Tribal members about the TCE OSHA exposure 
limits being outdated, Tribal interest in seeing TCE phased out and an 
interest in reducing greenhouse gas emissions, and concerns that third 
party disposal may be occurring near Tribal lands, with a particular 
interest in protecting workers at publicly owned treatment works.

G. Executive Order 13045: Protection of Children From Environmental 
Health Risks and Safety Risks

    Executive Order 13045 (62 FR 19885, April 23, 1997) directs Federal 
agencies to include an evaluation of the health and safety effects of 
the planned regulation on children in Federal health and safety 
standards and explain why the regulation is preferable to potentially 
effective and reasonably feasible alternatives. While the environmental 
health or safety risks addressed by this action present a 
disproportionate risk to children due to TCE's developmental toxicity, 
this action is not subject to Executive Order 13045 because it is not a 
significant regulatory action under section 3(f)(1) of Executive Order 
12866.
    However, EPA's 2021 Policy on Children's Health applies to this 
action. Information on how the Policy was applied is presented in Unit 
III.A.3. In addition, this action's health and risk assessments are 
contained in Units III.B.2., VI.A. and B., and the 2020 Risk Evaluation 
for TCE (section 4 in Ref. 1) and the Economic Analysis for this 
proposed rulemaking (Ref. 3).

H. Executive Order 13211: Actions Concerning Regulations That 
Significantly Affect Energy Supply, Distribution or Use

    This action is not a ``significant energy action'' under Executive 
Order 13211 (66 FR 28355, May 22, 2001) because it is not likely to 
have a significant adverse effect on the supply, distribution or use of 
energy.

I. National Technology Transfer and Advancement Act (NTTAA)

    Pursuant to the NTTAA section 12(d), 15 U.S.C. 272., the Agency has 
determined that this rulemaking involves environmental monitoring or 
measurement, specifically for occupational inhalation exposures to TCE. 
Consistent with the Agency's Performance Based Measurement System 
(PBMS), the Agency proposes not to require the use of specific, 
prescribed analytic methods. Rather, the Agency plans to allow the use 
of any method that meets the prescribed performance criteria. The PBMS 
approach is intended to be more flexible and cost-effective for the 
regulated community; it is also intended to encourage innovation in 
analytical technology and improved data quality. EPA is not precluding 
the use of any method, whether it constitutes a voluntary consensus 
standard or not, as long as it meets the performance criteria 
specified.
    For this rulemaking, the key consideration for the PBMS approach is 
the ability to accurately detect and measure airborne concentrations of 
TCE at the ECEL and the ECEL action level. Some examples of methods 
which meet the criteria are included in appendix B of the ECEL memo 
(Ref. 46). EPA recognizes that there may be voluntary consensus 
standards that meet the proposed criteria (Ref. 12). EPA request 
comments on whether it should incorporate such voluntary consensus 
standards in the rule and seeks information in support of such comments 
regarding the availability and applicability of voluntary consensus 
standards that may achieve the sampling and analytical requirements of 
the rule in lieu of the PBMS approach.
    EPA requests comment on the degree to which additional guidance 
related to use of methods might be necessary.

J. Executive Orders 12898: Federal Actions To Address Environmental 
Justice in Minority Populations and Low-Income Populations and 14096: 
Revitalizing Our Nation's Commitment to Environmental Justice for All

    EPA believes that the human health or environmental conditions that 
exist prior to this action result in or have the potential to result in 
disproportionate and adverse human health or environmental effects on 
communities with environmental justice concerns. As described more 
fully in the Economic Analysis, EPA conducted an analysis to 
characterize the baseline conditions faced by communities and workers 
affected by the regulation to identify the potential for 
disproportionate impacts on communities with EJ concerns in accordance 
with Executive Order 12898 (59 FR 7629, February 16, 1994) and 
Executive Order 14096 (88 FR 25251, April 26, 2023). The baseline 
characterization suggests that workers in affected industries and 
regions, as well as residents of nearby communities, are more likely to 
be people of color than the general population in affected states, 
although this varied by use assessed. Based on reasonably available 
information, EPA believes that there are potential EJ concerns in 
communities surrounding facilities subject to this regulation (Ref. 3).
    EPA believes that this action is likely to reduce existing 
disproportionate and adverse effects on communities with

[[Page 74786]]

environmental justice concerns. While the regulatory options are 
anticipated to address the unreasonable risk from exposure to TCE to 
the extent necessary so that it is no longer unreasonable, EPA is not 
able to quantify the distribution of the change in risk for affected 
populations. EPA is also unable to quantify the changes in risks for 
affected populations from non-TCE-using technologies or practices that 
firms may adopt in response to the regulation to determine whether any 
such changes could pose EJ concerns. Data limitations that prevent EPA 
from conducting a more comprehensive analysis are summarized in the 
Economic Analysis (Ref. 3).
    EPA additionally identified and addressed EJ concerns by conducting 
outreach to advocates of communities that might be subject to 
disproportionate exposure to TCE. On June 16, 2021, and July 6, 2021, 
EPA held public meetings as part of this consultation (Ref. 32). See 
also Unit III.A.1. Following the EJ meetings, EPA received five written 
comments, in addition to oral comments provided during the 
consultations. In general, commenters supported strong regulation of 
TCE to protect lower-income communities and workers. Commenters 
supported strong outreach to affected communities, encouraged EPA to 
follow the hierarchy of controls, favored prohibitions, and noted the 
uncertainty, and, in some cases, inadequacy, of PPE.
    The information supporting the review under Executive Order 12898 
and Executive Order 14096 is contained in Units I.E., II.D., III.A.1., 
VI.A., and in the Economic Analysis (Ref. 3). EPA's presentations and 
fact sheets for the EJ consultations related to this rulemaking, are 
available at https://www.epa.gov/assessing-and-managing-chemicals-under-tsca/materials-june-and-july-2021-environmental-justice. These 
materials and a summary of the consultation are also available in the 
public docket for this rulemaking (Ref. 32).

List of Subjects in 40 CFR Part 751

    Environmental protection, Chemicals, Export notification, Hazardous 
substances, Import certification, Reporting and recordkeeping.

Michael S. Regan,
Administrator.

    Therefore, for the reasons stated in the preamble, EPA proposes to 
amend 40 CFR part 751 as follows:

PART 751--REGULATION OF CERTAIN CHEMICAL SUBSTANCES AND MIXTURES 
UNDER SECTION 6 OF THE TOXIC SUBSTANCES CONTROL ACT

0
1. The authority citation for part 751 continues to read as follows:

    Authority: 15 U.S.C. 2605, 15 U.S.C. 2625(l)(4).

0
2. Amend Sec.  751.5 by adding in alphabetical order definitions for 
``Authorized person'', ``ECEL'', ``Exposure group'', ``Owner or 
operator'', ``Potentially exposed person'', ``Regulated area'', and 
``Retailer'' to read as follows:


Sec.  751.5  Definitions.

* * * * *
    Authorized person means any person specifically authorized by the 
owner or operator to enter, and whose duties require the person to 
enter a regulated area.
* * * * *
    ECEL is an Existing Chemical Exposure Limit and means an airborne 
concentration calculated as an eight (8)-hour time-weighted average 
(TWA).
* * * * *
    Exposure group means a group consisting of every person performing 
the same or substantially similar operations in each work shift, in 
each job classification, and in each work area where exposure to 
chemical substances or mixtures is reasonably likely to occur.
    Owner or operator means any person who owns, leases, operates, 
controls, or supervises a workplace covered by this part.
* * * * *
    Potentially exposed person means any person who may be 
occupationally exposed to a chemical substance or mixture in a 
workplace as a result of a condition of use of that chemical substance 
or mixture.
    Regulated area means an area established by the regulated entity to 
demarcate areas where airborne concentrations of a specific chemical 
substance exceed, or there is a reasonable possibility they may exceed, 
the ECEL or the EPA STEL.
    Retailer means a person who distributes in commerce or makes 
available a chemical substance or mixture to consumer end users, 
including e-commerce internet sales or distribution. Any distributor 
with at least one consumer end user customer is considered a retailer. 
A person who distributes in commerce or makes available a chemical 
substance or mixture solely to commercial or industrial end users or 
solely to commercial or industrial businesses is not considered a 
retailer.
0
2. Add new subpart D to read as follows:
Subpart D--Trichloroethylene
Sec.
751.301 General.
751.303 Definitions.
751.305 Prohibitions of manufacturing, processing, distribution in 
commerce, use and disposal.
751.307 Phaseout of trichloroethylene use in manufacture of HFC-
134a.
751.309 Phaseout of trichloroethylene use in vapor degreasing for 
booster rocket nozzles.
751.311 Workplace chemical protection program.
751.313 Downstream notification.
751.315 Recordkeeping requirements.
751.317 Exemptions.


Sec.  751.301  General.

    This subpart establishes prohibitions and restrictions on the 
manufacture (including import), processing, distribution in commerce, 
use, and disposal of trichloroethylene (TCE) (CASRN 79-01-6) to prevent 
unreasonable risk of injury to health in accordance with TSCA section 
6(a).


Sec.  751.303  Definitions.

    The definitions in subpart A of this part apply to this subpart 
unless otherwise specified in this section. In addition, the following 
definitions apply:
    Distribute in commerce has the same meaning as in section 3 of the 
Act, except that the term does not include retailers for purposes of 
Sec. Sec.  751.313 and 751.315.
    ECEL action level means a concentration of airborne TCE of 0.00055 
parts per million (ppm) calculated as an eight (8)-hour time-weighted 
average (TWA).


Sec.  751.305  Prohibitions of manufacturing, processing, distribution 
in commerce, use and disposal.

    (a) Applicability. The provisions of this section apply to the 
following:
    (1) Manufacturing (including importing);
    (2) Processing;
    (3) All industrial and commercial uses;
    (4) All consumer uses;
    (5) Distribution in commerce; and
    (6) Disposal of TCE to industrial pre-treatment, industrial 
treatment, or publicly owned treatment works.
    (b) Prohibitions. (1) After [DATE 3 MONTHS AFTER DATE OF 
PUBLICATION OF THE FINAL RULE IN THE FEDERAL REGISTER], all persons are 
prohibited from manufacturing (including importing)

[[Page 74787]]

TCE, except as specified in paragraphs (b)(4) through (13) of this 
section.
    (2) After [DATE 6 MONTHS AFTER DATE OF PUBLICATION OF THE FINAL 
RULE IN THE FEDERAL REGISTER], all persons are prohibited from 
processing and distributing in commerce (including making available) 
TCE, including any TCE-containing products, except as specified in 
paragraphs (b)(4) through (13) of this section.
    (3) After [DATE 9 MONTHS AFTER DATE OF PUBLICATION OF THE FINAL 
RULE IN THE FEDERAL REGISTER], all persons are prohibited from 
industrial and commercial use of TCE, including any TCE-containing 
products, except as specified in paragraphs (b)(4) through (13) of this 
section.
    (4) After [DATE 6 MONTHS AFTER DATE OF PUBLICATION OF THE FINAL 
RULE IN THE FEDERAL REGISTER], all persons are prohibited from 
manufacturing (including importing) TCE for industrial and commercial 
use for batch vapor degreasing in open-top and closed-loop degreasing 
equipment, except for the use specified in paragraphs (b)(9) and (11) 
of this section.
    (5) After [DATE 9 MONTHS AFTER DATE OF PUBLICATION OF THE FINAL 
RULE IN THE FEDERAL REGISTER], all persons are prohibited from 
processing TCE for industrial and commercial use for batch vapor 
degreasing in open-top and closed-loop degreasing equipment, except for 
the use specified in paragraphs (b)(9) and (11) of this section.
    (6) After [DATE 1 YEAR AFTER DATE OF PUBLICATION OF THE FINAL RULE 
IN THE FEDERAL REGISTER], all persons are prohibited from the 
industrial and commercial use of TCE for batch vapor degreasing in 
open-top and closed-loop degreasing equipment, except for the use 
specified in paragraphs (b)(9) and (11) of this section.
    (7) After [DATE 18 MONTHS AFTER DATE OF PUBLICATION OF THE FINAL 
RULE IN THE FEDERAL REGISTER], all persons are prohibited from 
manufacturing (including importing) TCE for processing of TCE as a 
reactant/intermediate and processing TCE for the industrial and 
commercial use of TCE as a processing aid for: battery separator 
manufacturing; process solvent used in polymer fiber spinning, 
fluoroelastomer manufacture and Alcantara manufacture; extraction 
solvent used in caprolactam manufacture; precipitant used in beta-
cyclodextrin manufacture, except for those uses specified in paragraphs 
(b)(10) and (12) of this section.
    (8) After [DATE 2 YEARS AFTER DATE OF PUBLICATION OF THE FINAL RULE 
IN THE FEDERAL REGISTER], all persons are prohibited from processing 
TCE as a reactant/intermediate and from processing TCE for the 
industrial and commercial use of TCE as a processing aid in: process 
solvent used in battery manufacture; process solvent used in polymer 
fiber spinning, fluoroelastomer manufacture and Alcantara manufacture; 
extraction solvent used in caprolactam manufacture; precipitant used in 
beta-cyclodextrin manufacture, except for those uses specified in 
paragraphs (b)(10) and (12) of this section.
    (9) After [DATE 5 YEARS AFTER DATE OF PUBLICATION OF THE FINAL RULE 
IN THE FEDERAL REGISTER] all persons are prohibited from the industrial 
and commercial use of TCE as a solvent in closed-loop batch vapor 
degreasing for rayon fabric scouring for end use in producing rocket 
booster nozzles for Federal agencies and their contractors, and 
manufacturing (including importing), processing, and distribution in 
commerce of TCE for such use, unless such persons obtain and maintain 
the records required by Sec.  751.309 demonstrating that a final pre-
launch test was completed using an alternative to TCE in the production 
of the rocket booster nozzles.
    (10) After [DATE 8 YEARS AND 6 MONTHS AFTER DATE OF PUBLICATION OF 
THE FINAL RULE IN THE FEDERAL REGISTER], all persons are prohibited 
from manufacturing (including import), distribution in commerce, and 
processing of TCE as an intermediate for manufacturing 
hydrofluorocarbon 134-a, also known as 1,1,1,2-Tetrafluroethane (HFC-
134a: CAS Number 811-97-2).
    (11) After [DATE 10 YEARS AFTER DATE OF PUBLICATION OF THE FINAL 
RULE IN THE FEDERAL REGISTER], all persons are prohibited from the 
industrial and commercial use of TCE as a solvent in closed-loop batch 
vapor degreasing for rayon fabric scouring for end use in producing 
rocket booster nozzles for Federal agencies and their contractors, and 
manufacturing (including importing), processing, and distribution in 
commerce of TCE for such use.
    (12) After [DATE 10 YEARS AFTER DATE OF PUBLICATION OF THE FINAL 
RULE IN THE FEDERAL REGISTER], all persons are prohibited from the 
industrial and commercial use of TCE as a processing aid for battery 
separatory manufacturing, and the manufacturing (including importing), 
processing, and distribution in commerce of TCE for such use.
    (13) After [DATE 10 YEARS AFTER DATE OF PUBLICATION OF THE FINAL 
RULE IN THE FEDERAL REGISTER], for DoD naval vessels and their systems, 
and in the maintenance, fabrication, and sustainment for and of such 
vessels and systems, prohibit the industrial and commercial use of TCE 
as potting compounds for naval electronic systems and equipment; 
sealing compounds for high and ultra high vacuum systems; bonding 
compounds for materials testing and maintenance of underwater systems 
and bonding of nonmetallic materials; and cleaning requirements (which 
includes degreasing using wipes, sprays, solvents and vapor degreasing) 
for: materials and components required for military ordnance testing; 
temporary resin repairs in vessel spaces where welding is not 
authorized; ensuring polyurethane adhesion for electronic systems and 
equipment repair and installation of elastomeric materials; various 
naval combat systems, radars, sensors, equipment; fabrication and 
prototyping processes to remove coolant and other residue from machine 
parts; machined part fabrications for naval systems; installation of 
topside rubber tile material aboard vessels; and vapor degreasing 
required for substrate surface preparation prior to electroplating 
processes.
    (14) After [DATE 50 YEARS AFTER DATE OF PUBLICATION OF THE FINAL 
RULE IN THE FEDERAL REGISTER], all persons are prohibited from 
industrial and commercial uses of TCE for the laboratory uses for 
essential laboratory uses described in Sec.  751.317(b)(1), and from 
the manufacturing (including importing), processing, and distribution 
in commerce of TCE for such uses.
    (15) After [DATE 9 MONTHS AFTER DATE OF PUBLICATION OF THE FINAL 
RULE IN THE FEDERAL REGISTER], all persons manufacturing (including 
importing), processing, and using TCE are prohibited from disposal of 
TCE to industrial pre-treatment, industrial treatment, or publicly 
owned treatment works except as specified in paragraph (b)(16) of this 
section.
    (16) After [DATE 50 YEARS AFTER DATE OF PUBLICATION OF THE FINAL 
RULE IN THE FEDERAL REGISTER], all persons are prohibited from disposal 
of TCE to industrial pre-treatment, industrial treatment, or publicly 
owned treatment works for the purposes of cleanup projects of TCE-
contaminated water and groundwater as described in Sec.  751.317(b)(2).

[[Page 74788]]

    (17) After [DATE 7 YEARS AFTER DATE OF PUBLICATION OF THE FINAL 
RULE IN THE FEDERAL REGISTER], all persons are prohibited from the 
industrial and commercial use of TCE as a solvent in closed-loop vapor 
degreasing necessary for human-rated rocket engine cleaning by NASA and 
its contractors as described in Sec.  751.317(c)(3) and the 
manufacturing (including importing), processing, and distribution in 
commerce of TCE for such use.


Sec.  751.307  Phaseout of trichloroethylene use in manufacture of HFC-
134a.

    (a) Baseline. Before [DATE 6 MONTHS AFTER DATE OF PUBLICATION OF 
THE FINAL RULE IN THE FEDERAL REGISTER], each manufacturer of HFC-134a 
who processes TCE as an intermediate must establish a baseline annual 
volume of TCE processed as an intermediate.
    (1) The manufacturer must use the average of any 12 consecutive 
months in the 36 months preceding [DATE OF PUBLICATION OF THE FINAL 
RULE IN THE FEDERAL REGISTER] to calculate the baseline.
    (2) The manufacturer must retain records that demonstrate how the 
baseline annual volume was calculated, in accordance with Sec.  
751.315(d)(1).
    (b) Phaseout. (1) Beginning [DATE 2 YEARS AND 6 MONTHS AFTER DATE 
OF PUBLICATION OF THE FINAL RULE IN THE FEDERAL REGISTER], each 
manufacturer of HFC-134a who processes TCE as an intermediate is not 
permitted to process TCE as an intermediate at an annual volume greater 
than 75 percent of the baseline.
    (2) Beginning [DATE 4 YEARS AND 6 MONTHS AFTER DATE OF PUBLICATION 
OF THE FINAL RULE IN THE FEDERAL REGISTER], each manufacturer of HFC-
134a who processes TCE as an intermediate is not permitted to processes 
TCE as an intermediate at an annual volume greater than 50 percent of 
the baseline.
    (3) Beginning [DATE 6 YEARS AND 6 MONTHS AFTER DATE OF PUBLICATION 
OF THE FINAL RULE IN THE FEDERAL REGISTER], each manufacturer of HFC-
134a who processes TCE as an intermediate is not permitted to processes 
TCE as an intermediate at an annual volume greater than 25 percent of 
the baseline so established.
    (4) Beginning [DATE 8 YEARS AND 6 MONTHS AFTER DATE OF PUBLICATION 
OF THE FINAL RULE IN THE FEDERAL REGISTER], each manufacturer of HFC-
134a who processes TCE as an intermediate is prohibited from processing 
TCE as an intermediate.
    (c) Workplace chemical protection program. All persons using TCE in 
accordance with this section must comply with Sec.  751.311.


Sec.  751.309  Phaseout of trichloroethylene use in vapor degreasing 
for booster rocket nozzles.

    (a) In accordance with Sec.  751.305(b)(9), until [DATE 5 YEARS 
AFTER DATE OF PUBLICATION OF THE FINAL RULE IN THE FEDERAL REGISTER], 
TCE may be manufactured (including imported), processed, distributed in 
commerce, and used as a solvent in closed-loop batch vapor degreasing 
for rayon fabric scouring for end use in rocket booster nozzle 
production by Federal agencies and their contractors.
    (b) From [DATE 5 YEARS AFTER DATE OF PUBLICATION OF THE FINAL RULE 
IN THE FEDERAL REGISTER] until [DATE 10 YEARS AFTER DATE OF PUBLICATION 
OF THE FINAL RULE IN THE FEDERAL REGISTER], TCE may only be 
manufactured (including imported), processed, distributed in commerce, 
and used as a solvent in closed-loop batch vapor degreasing for rayon 
fabric scouring, for end use in rocket booster nozzle production by 
Federal agencies and their contractors by persons who maintain records 
demonstrating that a final pre-launch test of rocket booster nozzles 
without using TCE was completed.
    (c) All persons using TCE in accordance with this section must 
comply with Sec.  751.311.


Sec.  751.311  Workplace chemical protection program.

    (a) Applicability. The provisions of this section apply to 
workplaces engaged in the following conditions of use of TCE that are 
allowed to temporarily continue past one year, in accordance with Sec.  
751.305(b)(4) through (13), Sec.  751.307, and Sec.  751.309:
    (1) Manufacturing (domestic manufacture);
    (2) Manufacturing (import);
    (3) Processing as a reactant/intermediate;
    (4) Processing into formulation, mixture or reaction product;
    (5) Processing (repackaging);
    (6) Processing (recycling);
    (7) Industrial and commercial use as a processing aid in process 
solvent used in battery manufacture; process solvent used in polymer 
fiber spinning, fluoroelastomer manufacture and Alcantara manufacture; 
extraction solvent used in caprolactam manufacture; precipitant used in 
beta-cyclodextrin manufacture;
    (8) Industrial and commercial use in other miscellaneous industrial 
and commercial uses (laboratory use for essential laboratory 
activities);
    (9) Industrial and commercial use of TCE as a solvent in closed-
loop batch vapor degreasing for rayon fabric scouring for end use in 
rocket booster nozzle production by Federal agencies and their 
contractors;
    (10) Disposal of TCE to industrial pre-treatment, industrial 
treatment, or publicly owned treatment works for the purposes of 
cleanup projects of TCE-contaminated water and groundwater;
    (11) Industrial and commercial use of TCE for DoD naval vessels and 
their systems, and in the maintenance, fabrication, and sustainment for 
and of such vessels and systems; as potting compounds for naval 
electronic systems and equipment; sealing compounds for high and ultra 
high vacuum systems; bonding compounds for materials testing and 
maintenance of underwater systems and bonding of nonmetallic materials; 
and cleaning requirements (which includes degreasing using wipes, 
sprays, solvents and vapor degreasing) for: materials and components 
required for military ordnance testing; temporary resin repairs in 
vessel spaces where welding is not authorized; ensuring polyurethane 
adhesion for electronic systems and equipment repair and installation 
of elastomeric materials; various naval combat systems, radars, 
sensors, equipment; fabrication and prototyping processes to remove 
coolant and other residue from machine parts; machined part 
fabrications for naval systems; installation of topside rubber tile 
material aboard vessels; and vapor degreasing required for substrate 
surface preparation prior to electroplating processes; and
    (12) Industrial and commercial use of TCE as a solvent in closed-
loop vapor degreasing necessary for human-rated rocket engine cleaning 
by NASA and its contractors.
    (b) Existing chemical exposure limit (ECEL). (1) Applicability. The 
provisions of this paragraph (b) apply to any workplace engaged in the 
conditions of use listed in paragraphs (a)(1) through (9) of this 
section.
    (2) ECEL. Beginning [DATE 9 MONTHS AFTER DATE OF PUBLICATION OF THE 
FINAL RULE IN THE FEDERAL REGISTER], or beginning 4 months after 
introduction of TCE into the workplace if TCE use commences after [DATE 
6 MONTHS AFTER DATE OF PUBLICATION OF THE FINAL RULE IN THE FEDERAL 
REGISTER], the owner or operator must ensure to the extent possible 
that no person is exposed to an airborne

[[Page 74789]]

concentration of TCE in excess of 1.1 parts of TCE per billion parts of 
air (0.0011 ppm) as an eight (8)-hour TWA, in accordance with the 
requirements of paragraph (c) of this section and, if necessary, 
paragraph (e) of this section:
    (3) Exposure monitoring--(i) General. (A) Owners or operators must 
determine each potentially exposed person's exposure by either:
    (1) Taking a personal breathing zone air sample of each potentially 
exposed person's exposure; or
    (2) Taking personal breathing zone air samples that are 
representative of the 8-hour TWA of each person whose exposure must be 
monitored.
    (B) Representative 8-hour TWA exposures must be determined on the 
basis of one or more full-shift exposure of at least one person that 
represents, and does not underestimate, the potential exposure of every 
person in each exposure group and that represents the highest TCE 
exposures likely to occur under reasonably foreseeable conditions of 
use.
    (C) Exposure samples must be analyzed using an appropriate 
analytical method by a laboratory that complies with the Good 
Laboratory Practice Standards in 40 CFR part 792.
    (D) Owners or operators must ensure that methods used to perform 
exposure monitoring produce results that are accurate, to a confidence 
level of 95 percent, to within plus or minus 25 percent for airborne 
concentrations of TCE.
    (ii) Initial monitoring. (A) Each owner or operator who has a 
workplace or work operation covered by this section, except as provided 
for in paragraph (b)(3)(ii)(B) of this section, must perform initial 
monitoring of potentially exposed persons regularly working in areas 
where TCE is present.
    (B) The initial monitoring required in paragraph (b)(3)(ii)(A) of 
this section must be completed by [DATE 6 MONTHS AFTER DATE OF 
PUBLICATION OF THE FINAL RULE IN THE FEDERAL REGISTER] or within 30 
days of introduction of TCE into the workplace, whichever is later. 
Where the owner or operator has monitoring within five years prior to 
[DATE 2 MONTHS AFTER DATE OF PUBLICATION OF THE FINAL RULE IN THE 
FEDERAL REGISTER] and the monitoring satisfies all other requirements 
of this section, the owner or operator may rely on such earlier 
monitoring results to satisfy the requirements of paragraph 
(b)(3)(ii)(A) of this section.
    (iii) Periodic monitoring. The owner or operator must establish an 
exposure monitoring program for periodic monitoring of exposure to TCE 
in accordance with Table 1 to this paragraph (b)(3)(iii).

   Table 1 to Paragraph (b)(3)(iii)--Periodic Monitoring Requirements
------------------------------------------------------------------------
      Air concentration condition        Periodic monitoring requirement
------------------------------------------------------------------------
If all initial exposure monitoring is    Periodic exposure monitoring is
 below the ECEL action level (<0.00055    required at least once every 5
 ppm 8-hour TWA).                         years.
If the initial or most recent exposure   Periodic exposure monitoring is
 monitoring indicates that airborne       required within 3 months of
 exposure is above the ECEL (>0.0011      the most recent exposure
 ppm 8-hour TWA).                         monitoring.
If the initial or most recent exposure   Periodic exposure monitoring is
 monitoring indicates that airborne       required within 6 months of
 exposure is at or above the ECEL         the most recent exposure
 action level but at or below the ECEL    monitoring.
 (>=0.00055 ppm 8-hour TWA, <=0.0011
 ppm 8-hour TWA).
If the two most recent (non-initial)     Periodic exposure monitoring is
 exposure monitoring measurements,        required within 5 years of the
 taken at least seven days apart,         most recent exposure
 indicate that airborne exposure is       monitoring.
 below the ECEL action level (<0.00055
 ppm 8-hour TWA).
If the owner or operator engages in a    The owner or operator may forgo
 condition of use for which compliance    its current periodic
 with the WCPP would be required but      monitoring event. However,
 does not manufacture, process, use, or   documentation of cessation of
 dispose of TCE in that condition of      use of TCE as well as periodic
 use over the entirety of time since      monitoring would be required
 the last required monitoring event.      when the owner or operator
                                          resumes any of the conditions
                                          of use for which compliance
                                          with the WCPP is proposed.
------------------------------------------------------------------------

    (iv) Additional monitoring. (A) The owner or operator must conduct 
additional initial exposure monitoring whenever there has been a change 
in the production, process, control equipment, personnel or work 
practices that may reasonably be expected to result in new or 
additional exposures above the ECEL action level or when the owner or 
operator has any reason to believe that new or additional exposures 
above the ECEL action level have occurred.
    (B) Whenever start-ups, shutdown, spills, leaks, ruptures, or other 
breakdowns occur that may lead to exposure to potentially exposed 
persons, the owner or operator must conduct additional initial exposure 
monitoring (using personal breathing zone sampling) after the cleanup 
of the spill or repair of the leak, rupture, or other breakdown.
    (v) Notification of monitoring results. (A) The owner or operator 
must inform persons whose exposures are represented by the monitoring 
of the monitoring results within 15 working days.
    (B) This notification must include the following:
    (1) Exposure monitoring method(s) and results;
    (2) Identification and explanation of the ECEL and ECEL action 
level in plain language;
    (3) Any corresponding required respiratory protection as described 
in paragraph (e) of this section;
    (4) Descriptions of actions taken by the regulated entity to reduce 
exposure to or below the ECEL;
    (5) Quantity of TCE in use;
    (6) Location of TCE use;
    (7) Manner of TCE use;
    (8) Identified releases of TCE; and
    (9) Whether the airborne concentration of TCE exceeds the ECEL.
    (C) Notice must be provided in plain language writing, in a 
language that the person understands, to each potentially exposed 
person or posted in an appropriate and accessible location outside the 
regulated area with an English-language version and a non-English 
language version representing the language of the largest group of 
workers who do not read English.
    (4) Regulated areas. (i) Beginning [DATE 9 MONTHS AFTER DATE OF 
PUBLICATION OF THE FINAL RULE IN THE FEDERAL REGISTER], beginning 4 
months after introduction of trichloroethylene into the workplace if 
trichloroethylene use commences after [DATE 6 MONTHS AFTER DATE OF 
PUBLICATION OF THE FINAL RULE IN THE FEDERAL REGISTER], owners or 
operators must establish a regulated

[[Page 74790]]

area wherever any person's exposure to airborne concentrations of TCE 
exceeds or can reasonably be expected to exceed the ECEL.
    (ii) The owner or operator must limit access to regulated areas to 
authorized persons.
    (iii) The owner or operator must demarcate regulated areas from the 
rest of the workplace in a manner that adequately establishes and 
alerts persons to the boundaries of the area and minimizes the number 
of authorized persons exposed to TCE within the regulated area.
    (iv) The owner or operator must supply a respirator that complies 
with the requirements of paragraph (e) of this section and must ensure 
that all persons within the regulated area are using the provided 
respirators whenever TCE exposures may exceed the ECEL.
    (v) An owner or operator who has implemented all feasible 
engineering, work practice and administrative controls as required in 
paragraph (c)(1)(i) of this section, and who has established a 
regulated area as required by paragraph (b)(4)(i) of this section where 
TCE exposure exceeds or can reasonably be expected to exceed the ECEL 
only on certain days (for example, because of work or process schedule) 
must have persons use respirators in that regulated area on those days.
    (vi) The owner or operator must ensure that, within a regulated 
area, persons do not engage in non-work activities which may increase 
TCE exposure.
    (vii) The owner or operator must ensure that while persons are 
wearing respirators in the regulated area, they do not engage in 
activities which interfere with respirator seal or performance.
    (c) ECEL control procedures and plan--(1) Methods of compliance. 
The owner or operator must institute one or a combination of 
elimination, substitution, engineering controls or administrative 
controls to reduce exposure to or below the ECEL except to the extent 
that the owner or operator can demonstrate that such controls are not 
feasible as an interim measure. Wherever the feasible exposure 
controls, including one or a combination of elimination, substitution, 
engineering controls or administrative controls, which can be 
instituted are not sufficient to reduce exposure at or below the ECEL, 
the owner or operator must use them to reduce exposure to the lowest 
levels achievable by these controls and must supplement them by the use 
of respiratory protection that complies with the requirements of 
paragraph (e) of this section. Where an owner or operator cannot 
demonstrate exposure below the ECEL or exposure at the lowest 
achievable level for the facility, including through the use of 
engineering controls or work practices, and has not demonstrated that 
it has supplemented feasible exposure controls with respiratory 
protection, this will constitute a failure to comply with the ECEL. The 
owner or operator must maintain the effectiveness of engineering 
controls or administrative controls instituted under paragraph 
(d)(1)(i)(A) of this section. The owner or operator must not implement 
a schedule of personnel rotation as a means of compliance with the 
ECEL. The owner or operator must document their exposure control 
strategy and implementation in an exposure control plan in accordance 
with paragraph (d)(2) of this section.
    (2) Exposure control plan requirements. If any monitoring conducted 
in accordance with paragraph (b)(3) of this section shows worker 
exposures at or above the ECEL action level in the workplace, the owner 
or operator, within [DATE 12 MONTHS AFTER DATE OF PUBLICATION OF THE 
FINAL RULE IN THE FEDERAL REGISTER], must include and document in an 
exposure control plan the following:
    (i) Identification and rationale of exposure controls used or not 
used as a time-limited measure in the following sequence: elimination 
of TCE, substitution of TCE, engineering controls and administrative 
controls to reduce exposures in the workplace to either at or below the 
ECEL or to the lowest achievable level of TCE in the workplace;
    (ii) The exposure controls selected based on feasibility, 
effectiveness, and other relevant considerations;
    (iii) If exposure controls were not selected, document the efforts 
identifying why these are not feasible, not effective, or otherwise not 
implemented;
    (iv) Actions taken to implement exposure controls selected, 
including proper installation, maintenance, training or other steps 
taken;
    (v) Description of any regulated area and how it is demarcated, and 
identification of authorized persons; and description of when the owner 
or operator expects exposures may be likely to exceed the ECEL or 
lowest achievable exposure level;
    (vi) Identification of the lowest achievable exposure level and why 
further reductions are not possible;
    (vii) Regular inspections, evaluations, and updating of the 
exposure controls to ensure effectiveness and confirmation that all 
persons are implementing them as required until the prohibition 
compliance date;
    (viii) Occurrence and duration of any start-up, shutdown, or 
malfunction of the facility that causes air concentrations to be above 
the ECEL or lowest achievable exposure level and subsequent corrective 
actions taken during start-up, shutdown, or malfunctions to mitigate 
exposures to TCE; and
    (ix) Availability of the exposure control plan and associated 
records for potentially exposed persons.
    (d) Workplace information and training. (1) The owner or operator 
must provide information and training for each person prior to or at 
the time of initial assignment to a job involving potential exposure to 
TCE.
    (2) The owner or operator must ensure that information and training 
is presented in a manner that is understandable to each person required 
to be trained.
    (3) The following information and training must be provided to all 
persons assigned to a job involving potential exposure to TCE:
    (i) The requirements of this section, as well as how to access or 
obtain a copy of these requirements in the workplace;
    (ii) The quantity, location, manner of use, release, and storage of 
TCE and the specific operations in the workplace that could result in 
exposure to TCE, particularly noting where exposures may be above the 
ECEL;
    (iii) Methods and observations that may be used to detect the 
presence or release of TCE in the workplace (such as monitoring 
conducted by the owner or operator, continuous monitoring devices, 
visual appearance or odor of TCE when being released, etc.);
    (iv) The health hazards of TCE in the workplace; and
    (v) The principles of safe use and handling of TCE and measures 
potentially exposed persons can take to protect themselves from TCE, 
including specific procedures the owner or operator has implemented to 
protect potentially exposed persons from exposure to TCE, such as 
appropriate work practices, emergency procedures, and personal 
protective equipment to be used.
    (4) The owner or operator must re-train each potentially exposed 
person annually to ensure that each such person maintains the requisite 
understanding of the principles of safe use and handling of TCE in the 
workplace.
    (5) Whenever there are workplace changes, such as modifications of 
tasks or procedures or the institution of new tasks or procedures, 
which increase

[[Page 74791]]

exposure, and where those exposures exceed or can reasonably be 
expected to exceed the ECEL action level, the owner or operator must 
update the training as necessary to ensure that each potentially 
exposed person has the requisite proficiency.
    (e) Personal protective equipment (PPE)--(1) Applicability. The 
provisions of this paragraph (e) apply to any owner or operator that is 
required to provide respiratory protection or dermal protection 
pursuant to paragraphs (c)(1) and (d) of this section.
    (2) Selection. PPE, including respiratory and dermal protection, 
that is of safe design and construction for the work to be performed 
must be provided, used, and maintained in a sanitary, reliable, and 
undamaged condition. Owners and operators must select PPE that properly 
fits each affected person and communicate PPE selections to each 
affected person.
    (3) Respiratory protection. (i) After 3 months of receipt of any 
exposure monitoring or within [DATE 9 MONTHS AFTER DATE OF PUBLICATION 
OF THE FINAL RULE IN THE FEDERAL REGISTER], the owner or operators must 
supply a respirator, selected in accordance with this paragraph, to 
each person who enters a regulated area and must ensure that all 
persons within the regulated area are using the provided respirators 
whenever TCE exposures may exceed the ECEL.
    (ii) Owners or operators must provide respiratory protection in 
accordance with the provisions outlined in 29 CFR 1910.134(a) through 
(l) (except (d)(1)(iii)) and as specified in this paragraph for persons 
exposed or who may be expose to TCE in concentrations above the ECEL. 
For the purpose of this paragraph (e), the maximum use concentration 
(MUC) as used in 29 CFR 1910.134 must be calculated by multiplying the 
assigned protection factor (APF) specified for a respirator by the 
ECEL. For the purposes of this paragraph (e), provisions in 29 CFR 
1910.134(a) through (l) (except (d)(1)(iii)) applying to an 
``employee'' also apply equally to potentially exposed persons, and 
provisions applying to an ``employer'' also apply equally to owners or 
operators.
    (iii) Owners or operators must select and provide to persons 
appropriate respirators as indicated by the most recent monitoring 
results, as follows:
    (A) If the measured exposure concentration is at or below 0.0011 
ppm (1.1 ppb): no respiratory protection is required.
    (B) If the measured exposure concentration is above 0.0011 ppm (1.1 
ppb) and less than or equal to 0.0055 ppm (5.5 ppb) (5 times ECEL): Any 
National Institute for Occupational Safety and Health (NIOSH)-certified 
air-purifying quarter mask respirator (APF 5).
    (C) If the measured exposure concentration is above 0.0055 ppm (5.5 
ppb) and less than or equal to 0.011 ppm (110 ppb) (10 times ECEL): Any 
NIOSH-certified air-purifying half mask or full facepiece respirator 
equipped with NIOSH-approved organic vapor cartridges or canisters (APF 
10).
    (D) If the measured exposure concentration is above 0.011 ppm (11.0 
ppb) and less than or equal to 0.0275 ppm (27.5 ppb) (25 times ECEL): 
Any NIOSH-certified air-purifying full facepiece respirator equipped 
with NIOSH-approved organic vapor cartridges or canisters; any NIOSH-
certified powered air-purifying respirator equipped with NIOSH-approved 
organic vapor cartridges; or any NIOSH-certified continuous flow 
supplied air respirator equipped with a hood or helmet (APF 25).
    (E) If the measured exposure concentration is above 0.0275 ppm 
(27.5 ppb) and less than or equal to 0.055 ppm (55.0 ppb) (50 times 
ECEL): Any NIOSH-certified air-purifying full facepiece respirator 
equipped with NIOSH-approved organic vapor cartridges or canisters; or 
any NIOSH-certified powered air-purifying respirator equipped with a 
tight-fitting half facepiece and a NIOSH-approved organic vapor 
cartridges or canisters; any NIOSH-certified negative pressure (demand 
mode) supplied-air respirator equipped with a full facepiece; any 
NIOSH-certified continuous flow supplied-air respirator equipped with a 
tight-fitting half facepiece; any NIOSH-certified supplied air 
respirator equipped with a half facepiece and operated in a pressure 
demand or other positive pressure mode; or any NIOSH-certified negative 
pressure (demand mode) self-contained breathing apparatus respirator 
equipped with a full facepiece (APF 50).
    (F) If the measured exposure concentration is above 0.055 ppm (55.0 
ppb) and less than or equal to 1.1 ppm (1,100 ppb) (1,000 times ECEL): 
Any NIOSH-certified powered air-purifying respirator equipped with a 
full facepiece and NIOSH-approved organic vapor cartridges or 
canisters; any NIOSH-certified supplied air respirator equipped with a 
full facepiece and operated in a continuous flow mode or pressure 
demand or other positive pressure mode (APF 1,000).
    (G) If the measured exposure concentration is greater than 1.1 ppm 
(1,100 ppb) (1,000 times ECEL) or the concentration is unknown: Any 
NIOSH-certified self-contained breathing apparatus equipped with a full 
facepiece and operated in a pressure demand or other positive pressure 
mode; or any NIOSH-certified supplied air respirator equipped with a 
full facepiece and operated in a pressure demand or other positive 
pressure mode in combination with an auxiliary self-contained breathing 
apparatus operated in a pressure demand or other positive pressure mode 
(APF 10,000).
    (iv) The respiratory protection requirements in this paragraph 
represent the minimum respiratory protection requirements, such that 
any respirator affording a higher degree of protection than the 
required respirator may be used.
    (v) When a person whose job requires the use of a respirator cannot 
use a negative-pressure respirator, the owner or operator must provide 
that person with a respirator that has less breathing resistance than 
the negative-pressure respirator, such as a powered air-purifying 
respirator or supplied-air respirator, when the person is able to use 
it and if it provides the person with adequate protection.
    (vi) Owners or operators must document the notice to and ability of 
any potentially exposed person to access the exposure control plan and 
other associated records.
    (4) Dermal protection. The owner or operator must supply and 
require the donning of gloves that are chemically resistant to TCE with 
activity-specific training where dermal contact with TCE is possible, 
after application of the requirements in paragraph (e) of this section, 
in accordance with the hierarchy of controls.
    (5) PPE training. (i) Owners and operators must provide PPE 
training in accordance with 29 CFR 1910.132(f) to all persons required 
to use PPE prior to or at the time of initial assignment to a job 
involving potential exposure to TCE. For the purposes of this paragraph 
(e)(5)(i), provisions in 29 CFR 1910.132(f) applying to an ``employee'' 
also apply equally to potentially exposed persons, and provisions 
applying to an ``employer'' also apply equally to owners or operators.
    (ii) Owners and operators must retrain each potentially exposed 
person required to use PPE annually or whenever the owner or operator 
has reason to believe that a previously trained person does not have 
the required understanding and skill to properly use PPE, or when 
changes in the workplace or in PPE to be used render the previous 
training obsolete.

[[Page 74792]]

Sec.  751.313  Downstream notification.

    (a) Beginning on [DATE 2 MONTHS AFTER DATE OF PUBLICATION OF THE 
FINAL RULE IN THE FEDERAL REGISTER], each person who manufactures 
(including imports) TCE for any use must, prior to or concurrent with 
the shipment, notify companies to whom TCE is shipped, in writing, of 
the restrictions described in this subpart in accordance with paragraph 
(c) of this section.
    (b) Beginning on [DATE 6 MONTHS AFTER DATE OF PUBLICATION OF THE 
FINAL RULE IN THE FEDERAL REGISTER], each person who processes or 
distributes in commerce TCE or any TCE-containing products for any use 
must, prior to or concurrent with the shipment, notify companies to 
whom TCE is shipped, in writing, of the restrictions described in this 
subpart in accordance with paragraph (c) of this section.
    (c) The notification required under paragraphs (a) and (b) of this 
section must occur by inserting the following text in section 1(c) and 
15 of the Safety Data Sheet (SDS) provided with the TCE or with any 
TCE-containing product:
    After [DATE 6 MONTHS AFTER DATE OF PUBLICATION OF THE FINAL RULE IN 
THE FEDERAL REGISTER], this chemical/product is and can only be 
distributed in commerce or processed for the following purposes until 
the following prohibitions take effect: (1) Processing as an 
intermediate; a) for the manufacture of HFC-134a until [DATE 8.5 YEARS 
AFTER DATE OF PUBLICATION OF FINAL RULE IN THE FEDERAL REGISTER] and b) 
for all other processing as a reactant/intermediate until [DATE 2 YEARS 
AFTER DATE OF PUBLICATION OF THE FINAL RULE IN THE FEDERAL REGISTER]; 
(2) Industrial and commercial use as a solvent for open-top batch vapor 
degreasing until [DATE 1 YEAR AFTER DATE OF PUBLICATION OF THE FINAL 
RULE IN THE FEDERAL REGISTER]; (3) Industrial and commercial use as a 
solvent for closed-loop batch vapor degreasing until [DATE 1 YEAR AFTER 
DATE OF PUBLICATION OF THE FINAL RULE IN THE FEDERAL REGISTER], except 
for industrial and commercial use as a solvent for closed-loop batch 
vapor degreasing necessary for human-rated rocket engine cleaning by 
NASA and its contractors until [DATE 7 YEARS AFTER DATE OF PUBLICATION 
OF THE FINAL RULE IN THE FEDERAL REGISTER], and except for industrial 
and commercial use as a solvent for closed-loop batch vapor degreasing 
for rayon fabric scouring for end use in rocket booster nozzle 
production by Federal agencies and their contractors until [DATE 10 
YEARS AFTER DATE OF PUBLICATION OF THE FINAL RULE IN THE FEDERAL 
REGISTER]; (4) Industrial and commercial use as a processing aid in: a) 
battery separator manufacturing until [DATE 10 YEARS AFTER DATE OF 
PUBLICATION OF THE FINAL RULE IN THE FEDERAL REGISTER] and b) process 
solvent used in polymer fiber spinning, fluoroelastomer manufacture and 
Alcantara manufacture; extraction solvent used in caprolactam 
manufacture; precipitant used in beta-cyclodextrin manufacture until 
[DATE 2 YEARS AFTER DATE OF PUBLICATION OF THE FINAL RULE IN THE 
FEDERAL REGISTER]; (5) Industrial and commercial uses for DoD naval 
vessels and their systems, and in the maintenance, fabrication, and 
sustainment for and of such vessels and systems until [DATE 10 YEARS 
AFTER DATE OF PUBLICATION OF THE FINAL RULE IN THE FEDERAL REGISTER]; 
and (6) Industrial and commercial use for laboratory use for essential 
laboratory activities until [DATE 50 YEARS AFTER DATE OF PUBLICATION OF 
THE FINAL RULE IN THE FEDERAL REGISTER].


Sec.  751.315  Recordkeeping requirements.

    (a) General records. After [DATE 60 DAYS AFTER DATE OF PUBLICATION 
OF THE FINAL RULE IN THE FEDERAL REGISTER], all persons who 
manufacture, process, distribute in commerce, or engage in industrial 
or commercial use of TCE or TCE-containing products must maintain 
ordinary business records, such as invoices and bills-of-lading related 
to compliance with the prohibitions, restrictions, and other provisions 
of this subpart.
    (b) Workplace chemical protection program compliance--(1) ECEL 
exposure monitoring. For each monitoring event of TCE, owners or 
operators subject to the ECEL described in Sec.  751.311(b) must 
document the following:
    (i) Dates, duration, and results of each sample taken;
    (ii) All measurements that may be necessary to determine the 
conditions that may affect the monitoring results;
    (iii) Identification of all persons represented by the 
representative sampling monitoring, indicating which persons were 
actually monitored;
    (iv) Name, workplace address, work shift, job classification, and 
work area of the person monitored; documentation of all potentially 
exposed persons whose exposures the monitoring is intended to represent 
if using a representative sample; and type of respiratory protective 
device worn by the monitored person, if any;
    (v) Use of appropriate sampling and analytical methods, such as 
analytical methods already approved by EPA, Occupational Safety and 
Health Administration (OSHA) or NIOSH, or compliance with an analytical 
method verification procedure;
    (vi) Compliance with the Good Laboratory Practice Standards in 
accordance with 40 CFR part 792; and
    (vii) Information regarding air monitoring equipment, including: 
type, maintenance, calibrations, performance tests, limits of 
detection, and any malfunctions.
    (2) ECEL compliance. Owners or operators subject to the ECEL 
described in Sec.  751.311(b) must retain records of:
    (i) Exposure control plan as described in Sec.  751.311(d)(2);
    (ii) Facility exposure monitoring records;
    (iii) Notifications of exposure monitoring results;
    (iv) The name, workplace address, work shift, job classification, 
work area and respiratory protection used by each potentially exposed 
person and PPE program implementation, as described in Sec.  
751.311(e), including fit-testing and training; and
    (v) Information and training provided by the regulated entity to 
each person prior described in paragraph Sec.  751.311(d) and (e).
    (c) Records related to Sec.  751.317 exemptions. To maintain 
eligibility for an exemption described in Sec.  751.317, owners or 
operators must maintain records demonstrating compliance with the 
specific conditions of the exemption.
    (d) Records related to Sec. Sec.  751.307 and 751.309 phaseouts. 
(1) Each manufacturer of HFC-134a who uses TCE as an intermediate must 
maintain records of the annual quantity of TCE purchased and processed 
from the year 2023 until the termination of all processing of TCE as an 
intermediate.
    (2) Each person using TCE under Sec.  751.309 for industrial and 
commercial use as a solvent for closed-loop batch vapor degreasing for 
rayon fabric scouring for end use in rocket booster nozzle production 
by Federal agencies and their contractors, must maintain records 
demonstrating that the end use is in rocket booster nozzle production 
for Federal agencies and their contractors.
    (3) After [DATE 5 YEARS AFTER DATE OF PUBLICATION OF FINAL RULE IN 
THE FEDERAL REGISTER],

[[Page 74793]]

each person using TCE under Sec.  751.309 for industrial and commercial 
use as a solvent for closed-loop batch vapor degreasing, specifically 
for rayon fabric scouring, must maintain records that demonstrate that 
a final pre-launch test of rocket booster nozzles without using TCE was 
completed.
    (e) Minimum record retention periods. (1) The records required 
under paragraphs (a) through (c) of this section must be retained for 
at least 5 years from the date that such records were generated.
    (2) The records required under paragraph (d) of this section must 
be retained for at least 5 years after the use of TCE has ceased.


Sec.  751.317  Exemptions.

    (a) In general. (1) The time-limited exemptions established in 
Sec.  751.305(b)(12) and (13) are established in accordance with 15 
U.S.C. 2605(g).
    (2) In order to be eligible for the exemptions, regulated parties 
must comply with all conditions established for such exemptions in 
accordance with 15 U.S.C. 2605(g)(4).
    (b) Exemptions under 15 U.S.C. 2605(g)(1)(A). (1) Laboratory use 
for essential laboratory activities until [DATE 50 YEARS AFTER DATE OF 
PUBLICATION OF THE FINAL RULE IN THE FEDERAL REGISTER]. The following 
are specific conditions of the exemption for laboratory use at Sec.  
751.305(b)(13):
    (i) The industrial and commercial use of TCE as a laboratory 
chemical must only be for the following:
    (A) Essential laboratory activities, including chemical analysis, 
chemical synthesis, extracting or purifying other chemicals, dissolving 
other substances, and research and development for the advancement of 
cleanup activities and analytical methods for monitoring related to TCE 
contamination or exposure monitoring.
    (B) Federal agencies and their contractors conducting research and 
development activities and test and evaluation method activities, other 
than those described in paragraph (b)(1)(i)(A) of this section, and 
similar laboratory activities, provided the use is essential to the 
agency's mission.
    (ii) TCE must not be used as a laboratory chemical for testing 
asphalt.
    (iii) The use of TCE as a laboratory chemical must be performed on 
the premises of industrial or commercial laboratories.
    (iv) The owner or operator of the location where such use of TCE 
occurs, and manufacturers (including importers) and processors of TCE 
for such use, must comply with the Workplace Chemical Protection 
Program provisions in Sec.  751.311.
    (v) The owner or operator of the location where such use of TCE 
occurs must comply with the recordkeeping requirements in Sec.  
751.315.
    (2) Disposal of TCE to industrial pre-treatment, industrial 
treatment, or publicly owned treatment works for the purposes of 
cleanup projects of TCE-contaminated water and groundwater until [DATE 
50 YEARS AFTER DATE OF PUBLICATION OF THE FINAL RULE IN THE FEDERAL 
REGISTER]. The following are specific conditions of the exemption for 
disposal at Sec.  751.305(b)(15):
    (i) The disposal of TCE to industrial pre-treatment, industrial 
treatment, or publicly owned treatment works must only be for the 
purposes of cleanup projects of TCE-contaminated water and groundwater. 
The disposal of TCE to industrial pre-treatment, industrial treatment, 
or publicly owned treatment works is limited to only sites undergoing 
remediation under CERCLA, RCRA, or other Federal, state, and local 
government laws, regulations, or requirements.
    (ii) The owner or operator of the location where workers are 
handling TCE wastewater, and owners or operators of facilities where 
TCE is disposed to industrial pre-treatment, industrial treatment, or 
publicly owned treatment works, must comply with the Workplace Chemical 
Protection Program provisions in Sec.  751.311.
    (iii) The owner or operator of the location where such use of TCE 
occurs must comply with the recordkeeping requirements in Sec.  
751.315.
    (3) Use of TCE or TCE-containing products for the specific 
conditions of use identified in paragraph (b)(3)(i) of this section in 
an emergency by the National Aeronautics and Space Administration 
(NASA) and its contractors operating within the scope of their 
contracted work until [DATE 10 YEARS AFTER DATE OF PUBLICATION OF THE 
FINAL RULE IN THE FEDERAL REGISTER].
    (i) Applicability. The emergency use exemption described in this 
paragraph (b)(3) applies to the following specific conditions of use as 
described in paragraph (b)(3)(i)(A) of this section.
    (A) Conditions of use subject to this exemption--(1) Industrial and 
commercial use as solvent for open-top or closed-loop batch vapor 
degreasing.
    (2) Industrial and commercial use as solvent for cold cleaning.
    (3) Industrial and commercial use as a solvent for aerosol spray 
degreaser/cleaner and mold release.
    (4) Industrial and commercial use as a lubricant and grease in tap 
and die fluid.
    (5) Industrial and commercial use as a lubricant and grease in 
penetrating lubricant.
    (6) Industrial and commercial use as an adhesive and sealant in 
solvent-based adhesives and sealants.
    (7) Industrial and commercial as a functional fluid in heat 
exchange fluid.
    (8) Industrial and commercial use in corrosion inhibitors and anti-
scaling agents.
    (9) Industrial and commercial use of TCE as a processing aid.
    (B) Emergency use--(1) In general. An emergency is a serious and 
sudden situation requiring immediate action, within 15 days or less, 
necessary to protect:
    (i) Safety of NASA's or their contractors' personnel;
    (ii) NASA's missions;
    (iii) Human health, safety, or property, including that of adjacent 
communities; or
    (iv) The environment.
    (2) Duration. Each emergency is a separate situation; if use of TCE 
exceeds 15 days, then justification must be documented.
    (3) Eligibility. To be eligible for the exemption, the NASA and its 
contractors must:
    (i) Select TCE because there are no technically and economically 
feasible safer alternatives available during the emergency.
    (ii) Perform the emergency use of TCE at locations controlled by 
NASA or its contractors.
    (ii) Requirements. To be eligible for the emergency use exemption 
described in this paragraph (b)(3), the NASA and its contractors must 
comply with the following conditions:
    (A) Notification. Within 15 working days of the emergency use by 
NASA and its contractors, NASA must provide notice to EPA that includes 
the following:
    (1) Identification of the conditions of use detailed in paragraph 
(b)(3)(i)(A) of this section that the emergency use fell under;
    (2) An explanation for why the emergency use met the definition of 
emergency in paragraph (b)(3)(i)(B) of this section; and
    (3) An explanation of why TCE was selected, including why there 
were no technically and economically feasible safer alternatives 
available in the particular emergency.
    (B) Exposure control. The owner or operator must comply with the 
Workplace Chemical Protection Program provisions in Sec.  751.311, to 
the extent

[[Page 74794]]

technically feasible in light of the particular emergency.
    (C) Recordkeeping. The owner or operator of the location where the 
use takes place must comply with the recordkeeping requirements in 
Sec.  751.315.
    (c) Exemptions under 15 U.S.C. 2605(g)(1)(B)--(1) Lead-acid and 
lithium battery separator manufacturing until [DATE 10 YEARS AFTER DATE 
OF PUBLICATION OF THE FINAL RULE IN THE FEDERAL REGISTER]. The 
following are specific conditions of the exemption for use as a 
processing aid in the manufacturing of lead-acid and lithium battery 
separators at Sec.  751.305(b)(12):
    (i) The use of TCE as a processing aid for battery separator 
manufacturing must be limited to lead acid or lithium battery separator 
manufacturing.
    (ii) The owner or operator of the location where such use occurs, 
and manufacturers (including importers) and processors of TCE for such 
use, must comply with the Workplace Chemical Protection Program 
provisions in Sec.  751.311.
    (iii) The owner or operator of the location where such use of TCE 
occurs must comply with the recordkeeping requirements in Sec.  
751.315.
    (2) Certain industrial and commercial uses of TCE for DoD naval 
vessels and their systems, and in the maintenance, fabrication, and 
sustainment for and of such vessels and systems until [DATE 10 YEARS 
AFTER DATE OF PUBLICATION OF THE FINAL RULE IN THE FEDERAL REGISTER]. 
The following are specific conditions of the exemption for industrial 
and commercial uses of TCE for DoD naval vessel and their systems, and 
in the maintenance, fabrication, and sustainment for and of such 
vessels and systems:
    (i) The industrial and commercial use of TCE must be limited for 
DoD naval vessels and their systems, and in the maintenance, 
fabrication, and sustainment for and of such vessels and systems; as 
potting compounds for naval electronic systems and equipment; sealing 
compounds for high and ultra high vacuum systems; bonding compounds for 
materials testing and maintenance of underwater systems and bonding of 
nonmetallic materials; and cleaning requirements (which includes 
degreasing using wipes, sprays, solvents and vapor degreasing) for: 
materials and components required for military ordnance testing; 
temporary resin repairs in vessel spaces where welding is not 
authorized; ensuring polyurethane adhesion for electronic systems and 
equipment repair and installation of elastomeric materials; various 
naval combat systems, radars, sensors, equipment; fabrication and 
prototyping processes to remove coolant and other residue from machine 
parts; machined part fabrications for naval systems; installation of 
topside rubber tile material aboard vessels; and vapor degreasing 
required for substrate surface preparation prior to electroplating 
processes.
    (ii) The owner or operator of the location where such use occurs, 
and manufacturers (including importers) and processors of TCE for such 
use, must comply with the Workplace Chemical Protection Program 
provisions in Sec.  751.311.
    (iii) The owner or operator of the location where such use of TCE 
occurs must comply with the recordkeeping requirements in Sec.  
751.315.
    (3) Closed-loop vapor degreasing necessary for human-rated rocket 
engine cleaning by NASA and its contractors until [DATE 7 YEARS AFTER 
DATE OF PUBLICATION OF THE FINAL RULE IN THE FEDERAL REGISTER]. The 
following are specific conditions of the exemption for industrial and 
commercial use of TCE as a solvent for closed-loop vapor degreasing 
necessary for human-rated rocket engine cleaning by NASA and its 
contractors Sec.  751.305(b)(12):
    (i) The use of TCE in industrial and commercial as a solvent for 
closed-loop vapor degreasing is limited to the closed-loop vapor 
degreasing necessary for human-rated rocket engine cleaning by NASA and 
its contractors.
    (ii) The owner or operator of the location where such use occurs, 
and manufacturers (including importers) and processors of TCE for such 
use, must comply with the Workplace Chemical Protection Program 
provisions in Sec.  751.311.
    (iii) The owner or operator of the location where such use of TCE 
occurs, and manufacturers (including importers) and processors of TCE 
for such use, must comply with the recordkeeping requirements in Sec.  
751.315.

[FR Doc. 2023-23010 Filed 10-30-23; 8:45 am]
BILLING CODE 6560-50-P


