[Federal Register Volume 84, Number 159 (Friday, August 16, 2019)]
[Proposed Rules]
[Pages 42704-42752]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2019-17349]



[[Page 42703]]

Vol. 84

Friday,

No. 159

August 16, 2019

Part III





Environmental Protection Agency





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40 CFR Part 63





National Emission Standards for Hazardous Air Pollutants: Integrated 
Iron and Steel Manufacturing Facilities Residual Risk and Technology 
Review; Proposed Rule

  Federal Register / Vol. 84 , No. 159 / Friday, August 16, 2019 / 
Proposed Rules  

[[Page 42704]]


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ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 63

[EPA-HQ-OAR-2002-0083; FRL-9998-20-OAR]
RIN 2060-AT03


National Emission Standards for Hazardous Air Pollutants: 
Integrated Iron and Steel Manufacturing Facilities Residual Risk and 
Technology Review

AGENCY: Environmental Protection Agency (EPA).

ACTION: Proposed rule.

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SUMMARY: The Environmental Protection Agency (EPA) is proposing 
amendments to the National Emissions Standards for Hazardous Air 
Pollutants (NESHAP) for Integrated Iron and Steel Manufacturing 
Facilities. This proposal presents the results of the residual risk and 
technology review (RTR) conducted as required under the Clean Air Act 
(CAA). Based on the results of the EPA risk review, the Agency is 
proposing that risks due to emissions of air toxics are acceptable from 
this source category and that the current NESHAP provides an ample 
margin of safety to protect public health. Under the technology review, 
we are proposing there are no developments in practices, processes or 
control technologies that necessitate revision of the standards. 
Pursuant to granting a request to reconsider setting mercury standards 
in 2005, we are proposing an emissions standard for mercury based on 
limiting the amount of mercury in the metal scrap used by these 
facilities. We also are proposing: the removal of exemptions for 
periods of startup, shutdown, and malfunction (SSM) consistent with a 
2008 court decision, and clarifying that the emissions standards apply 
at all times; the addition of electronic reporting of performance test 
results and compliance reports; and minor corrections and 
clarifications for a few other rule provisions. Finally, we are 
soliciting comment on unmeasured fugitive and intermittent emissions 
that have been identified as occurring at facilities in this source 
category and the cost and effectiveness of potential work practices 
that could be implemented to reduce emissions from these fugitive and 
intermittent sources.

DATES: Comments. Comments must be received on or before September 30, 
2019. 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 September 16, 2019.
    Public hearing. If anyone contacts us requesting a public hearing 
on or before August 21, 2019, we will hold a hearing. Additional 
information about the hearing, if requested, will be published in a 
subsequent Federal Register document and posted at https://www.epa.gov/stationary-sources-air-pollution/integrated-iron-and-steel-manufacturing-national-emission-standards. See SUPPLEMENTARY 
INFORMATION for information on requesting and registering for a public 
hearing.

ADDRESSES: You may send comments, identified by Docket ID No. EPA-HQ-
OAR-2002-0083, by any of the following methods:
     Federal eRulemaking Portal: https://www.regulations.gov/ 
(our preferred method). Follow the online instructions for submitting 
comments.
     Email: a-and-r-docket@epa.gov. Include Docket ID No. EPA-
HQ-OAR-2002-0083 in the subject line of the message.
     Fax: (202) 566-9744. Attention Docket ID No. EPA-HQ-OAR-
2002-0083.
     Mail: U.S. Environmental Protection Agency, EPA Docket 
Center, Docket ID No. EPA-HQ-OAR-2002-0083, Mail Code 28221T, 1200 
Pennsylvania Avenue NW, Washington, DC 20460.
     Hand/Courier Delivery: EPA Docket Center, WJC West 
Building, Room 3334, 1301 Constitution Avenue NW, Washington, DC 20004. 
The Docket Cenetr's hours of operation are 8:30 a.m.-4:30 p.m., Monday-
Friday (except federal holidays).
    Instructions: All submissions received must include the Docket ID 
No. for this rulemaking. Comments received may be posted without change 
to https://www.regulations.gov/, including any personal information 
provided. For detailed instructions on sending comments and additional 
information on the rulemaking process, see the SUPPLEMENTARY 
INFORMATION section of this document.

FOR FURTHER INFORMATION CONTACT: For questions about this proposal, 
contact Dr. Donna Lee Jones, Sector Policies and Programs Division 
(D243-02), Office of Air Quality Planning and Standards, U.S. 
Environmental Protection Agency, Research Triangle Park, North Carolina 
27711; telephone number: (919) 541-5251; fax number: (919) 541-4991; 
and email address: jones.donnalee@epa.gov. For specific information 
regarding the risk assessment methodology, contact Ted Palma, Health 
and Environmental Impacts Division (C539-02), Office of Air Quality 
Planning and Standards, U.S. Environmental Protection Agency, Research 
Triangle Park, North Carolina 27711; telephone number: (919) 541-5470; 
fax number: (919) 541-0840; and email address: palma.ted@epa.gov. For 
information about monitoring and testing requirements, contact Kevin 
McGinn, Sector Policies and Programs Division (D230-02), Office of Air 
Quality Planning and Standards, U.S. Environmental Protection Agency, 
Research Triangle Park, North Carolina 27711; telephone number: (919) 
541-3796; fax number: (919) 541-4991; and email address: 
mcginn.kevin@epa.gov. For information about the applicability of the 
NESHAP to a particular entity, contact Maria Malave, Office of 
Enforcement and Compliance Assurance, U.S. Environmental Protection 
Agency, WJC South Building (Mail Code 2227A), 1200 Pennsylvania Avenue 
NW, Washington DC 20460; telephone number: (202) 564-7027; and email 
address: malave.maria@epa.gov.

SUPPLEMENTARY INFORMATION: 
    Public hearing. Please contact Ms. Adrian Gates at (919) 541-4860 
or by email at gates.adrian@epa.gov to request a public hearing, to 
register to speak at the public hearing, or to inquire as to whether a 
public hearing will be held.
    Docket. The EPA has established a docket for this rulemaking under 
Docket ID No. EPA-HQ-OAR-2002-0083. All documents in the docket are 
listed in Regulations.gov. Although listed, some information is not 
publicly available, e.g., Confidential Business Information (CBI) or 
other information whose disclosure is restricted by statute. Certain 
other material, such as copyrighted material, is not placed on the 
internet and will be publicly available only in hard copy. Publicly 
available docket materials are available either electronically in 
Regulations.gov or in hard copy at the EPA Docket Center, Room 3334, 
WJC West Building, 1301 Constitution Avenue NW, Washington, DC. The 
Public Reading Room is open from 8:30 a.m. to 4:30 p.m., Monday through 
Friday, excluding legal holidays. The telephone number for the Public 
Reading Room is (202) 566-1744, and the telephone number for the EPA 
Docket Center is (202) 566-1742.
    Instructions. Direct your comments to Docket ID No. EPA-HQ-OAR-
2002-0083. The EPA's policy is that all comments received will be 
included in the public docket without change and may be made available 
online at https://www.regulations.gov/, including any

[[Page 42705]]

personal information provided, unless the comment includes information 
claimed to be CBI or other information whose disclosure is restricted 
by statute. Do not submit information that you consider to be CBI or 
otherwise protected through https://www.regulations.gov/ or email. This 
type of information should be submitted by mail as discussed below.
    The EPA may publish any comment received to its public docket. 
Multimedia submissions (audio, video, etc.) must be accompanied by a 
written comment. The written comment is considered the official comment 
and should include discussion of all points you wish to make. The EPA 
will generally not consider comments or comment contents located 
outside of the primary submission (i.e., on the Web, cloud, or other 
file sharing system). For additional submission methods, the full EPA 
public comment policy, information about CBI or multimedia submissions, 
and general guidance on making effective comments, please visit https://www.epa.gov/dockets/commenting-epa-dockets.
    The https://www.regulations.gov/ website allows you to submit your 
comment anonymously, which means the EPA will not know your identity or 
contact information unless you provide it in the body of your comment. 
If you send an email comment directly to the EPA without going through 
https://www.regulations.gov/, your email address will be automatically 
captured and included as part of the comment that is placed in the 
public docket and made available on the internet. If you submit an 
electronic comment, the EPA recommends that you include your name and 
other contact information in the body of your comment and with any 
digital storage media you submit. If the EPA cannot read your comment 
due to technical difficulties and cannot contact you for clarification, 
the EPA may not be able to consider your comment. Electronic files 
should not include special characters or any form of encryption and be 
free of any defects or viruses. For additional information about the 
EPA's public docket, visit the EPA Docket Center homepage at https://www.epa.gov/dockets.
    Submitting CBI. Do not submit information containing CBI to the EPA 
through https://www.regulations.gov/ or email. Clearly mark the part or 
all of the information that you claim to be CBI. For CBI information on 
any digital storage media that you mail to the EPA, mark the outside of 
the digital storage media as CBI and then identify electronically 
within the digital storage media the specific information that is 
claimed as CBI. In addition to one complete version of the comments 
that includes information claimed as CBI, you must submit a copy of the 
comments that does not contain the information claimed as CBI directly 
to the public docket through the procedures outlined in Instructions 
above. If you submit any digital storage media that does not contain 
CBI, mark the outside of the digital storage media clearly that it does 
not contain CBI. Information not marked as CBI will be included in the 
public docket and the EPA's electronic public docket without prior 
notice. Information marked as CBI will not be disclosed except in 
accordance with procedures set forth in 40 Code of Federal Regulations 
(CFR) part 2. Send or deliver information identified as CBI only to the 
following address: OAQPS Document Control Officer (C404-02), OAQPS, 
U.S. Environmental Protection Agency, Research Triangle Park, North 
Carolina 27711, Attention Docket ID No. EPA-HQ-OAR-2002-0083.
    Preamble acronyms and abbreviations. We use multiple acronyms and 
terms in this preamble. While this list may not be exhaustive, to ease 
the reading of this preamble and for reference purposes, the EPA 
defines the following terms and acronyms here:

ACI activated carbon injection
AEGL acute exposure guideline level
AERMOD air dispersion model used by the HEM-3 model
AISI American Iron and Steel Institute
ANSI American National Standards Institute
ASTM American Society for Testing and Materials
ATSDR Agency for Toxic Substances and Disease Registry
BF blast furnace
BOPF basic oxygen processing furnace
CAA Clean Air Act
CalEPA California EPA
CBI Confidential Business Information
CDX Central Data Exchange
CEDRI Compliance and Emissions Data Reporting Interface
CFR Code of Federal Regulations
EAF electric arc furnace
EPA Environmental Protection Agency
ERPG Emergency Response Planning Guideline
ERT Electronic Reporting Tool
ESP electrostatic precipitators
GACT generally available control technology
HAP hazardous air pollutant(s)
HCl hydrochloric acid
HEM-3 Human Exposure Model, Version 1.5.5
HF hydrogen fluoride
HI hazard index
HMTDS hot metal transfer, desulfurization, and skimming
HQ hazard quotient
IBR incorporation by reference
ICR information collection request
IRIS Integrated Risk Information System
km kilometers
lbs/yr pounds per year
MACT maximum achievable control technology
mg/m\3\ milligrams per cubic meter
MIR maximum individual risk
MOU memorandum of understanding
NAAQS National Ambient Air Quality Standards
NAICS North American Industry Classification System
NATA National Air Toxics Assessment
NEI National Emissions Inventory
NESHAP national emission standards for hazardous air pollutants
NRDC Natural Resources Defense Council
NTTAA National Technology Transfer and Advancement Act
NVMSRP National Vehicle Mercury Switch Recovery Program
OAQPS Office of Air Quality Planning and Standards
OMB Office of Management and Budget
PAH polycyclic aromatic hydrocarbons
PB-HAP hazardous air pollutants known to be persistent and bio-
accumulative in the environment
PDF portable document format
PM particulate matter
POM polycyclic organic matter
ppm parts per million
PRA Paperwork Reduction Act
REL reference exposure level
RFA Regulatory Flexibility Act
RfC reference concentration
RfD reference dose
RTR residual risk and technology review
SAB Science Advisory Board
SIP state implementation plan
SSM startup, shutdown, and malfunction
SV screening value
THC total hydrocarbon
TOSHI target organ-specific hazard index
tpy tons per year
TRIM.FaTE Total Risk Integrated Methodology.Fate, Transport, and 
Ecological Exposure model
UF uncertainty factor
UFIP unmeasured fugitive and intermittent particulate
[micro]g/m\3\ microgram per cubic meter
UMRA Unfunded Mandates Reform Act
UPL upper prediction limit
URE unit risk estimate
U.S. United States
USGS U.S. Geological Survey
VCS voluntary consensus standards
VE visible emissions
VOC volatile organic compound

    Organization of this document. The information in this preamble is 
organized as follows:

I. General Information
    A. Does this action apply to me?
    B. Where can I get a copy of this document and other related 
information?
II. Background
    A. What is the statutory authority for this action?
    B. What is this source category and how does the current NESHAP 
regulate its HAP emissions?
    C. What data collection activities were conducted to support 
this action?

[[Page 42706]]

    D. What other relevant background information and data are 
available?
III. Analytical Procedures and Decision-Making
    A. How do we consider risk in our decision-making?
    B. How do we perform the technology review?
    C. How do we estimate post-MACT risk posed by the source 
category?
IV. Analytical Results and Proposed Decisions
    A. What are the results of the risk assessment and analyses?
    B What are our proposed decisions regarding risk acceptability, 
ample margin of safety, and adverse environmental effect?
    C. What are the results and proposed decisions based on our 
technology review?
    D. What actions are we taking pursuant to CAA sections 112(d)(2) 
and 112(d)(3)?
    E. What other actions are we proposing?
    F. What compliance dates are we proposing?
V. Summary of Cost, Environmental, and Economic Impacts
    A. What are the affected sources?
    B. What are the air quality impacts?
    C. What are the cost impacts?
    D. What are the economic impacts?
    E. What are the benefits?
VI. Request for Comments
VII. Submitting Data Corrections
VIII. Statutory and Executive Order Reviews
    A. Executive Order 12866: Regulatory Planning and Review and 
Executive Order 13563: Improving Regulation and Regulatory Review
    B. Executive Order 13771: Reducing Regulation and Controlling 
Regulatory Costs
    C. Paperwork Reduction Act (PRA)
    D. Regulatory Flexibility Act (RFA)
    E. Unfunded Mandates Reform Act (UMRA)
    F. Executive Order 13132: Federalism
    G. Executive Order 13175: Consultation and Coordination With 
Indian Tribal Governments
    H. Executive Order 13045: Protection of Children From 
Environmental Health Risks and Safety Risks
    I. Executive Order 13211: Actions Concerning Regulations That 
Significantly Affect Energy Supply, Distribution, or Use
    J. National Technology Transfer and Advancement Act. National 
Technology Transfer and Advancement Act (NTTAA) and 1 CFR part 51
    K. Executive Order 12898: Federal Actions to Address 
Environmental Justice in Minority Populations and Low-Income 
Populations

I. General Information

A. Does this action apply to me?

    Table 1 of this preamble lists the NESHAP and associated regulated 
industrial source categories that are the subject of this proposal. 
Table 1 is not intended to be exhaustive, but rather provides a guide 
for readers regarding the entities that this proposal is likely to 
affect. The proposed standards, once promulgated, will be directly 
applicable to the affected sources. Federal, state, local, and tribal 
government entities would not be affected by this proposal. As defined 
in the Initial List of Categories of Sources Under Section 112(c)(1) of 
the Clean Air Act Amendments of 1990 (see 57 FR 31576, July 16, 1992) 
and Documentation for Developing the Initial Source Category List (see 
EPA-450/3-91-030), the Integrated Iron and Steel Manufacturing source 
category is any facility engaged in producing steel from iron ore. 
integrated iron and steel manufacturing includes the following 
processes: sinter production, iron production, iron preparation (hot 
metal desulfurization), and steel production. The iron production 
process includes the production of iron in blast furnaces (BFs) by the 
reduction of iron-bearing materials with a hot gas. The steel 
production process includes basic oxygen processing furnaces (BOPF).

    Table 1--NESHAP and Industrial Source Categories Affected by This
                                Proposal
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          Source category                  NESHAP         NAICS code \1\
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Integrated Iron and Steel           40 CFR part 63,               331110
 Manufacturing.                      subpart FFFFF.
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\1\ North American Industry Classification System.

B. Where can I get a copy of this document and other related 
information?

    In addition to being available in the docket, an electronic copy of 
this action is available on the internet. Following signature by the 
EPA Administrator, the EPA will post a copy of this proposal at https://www.epa.gov/stationary-sources-air-pollution/integrated-iron-and-steel-manufacturing-national-emission-standards. Following publication 
in the Federal Register, the EPA will post the Federal Register version 
of the proposal and key technical documents at this same website. 
Information on the overall RTR program is available at https://www3.epa.gov/ttn/atw/rrisk/rtrpg.html.
    A redline version of the regulatory language that incorporates the 
proposed changes in this action is available in the docket for this 
action (Docket ID No. EPA-HQ-OAR-2002-0083).

II. Background

A. What is the statutory authority for this action?

    The statutory authority for this action is provided by sections 112 
and 301 of the CAA, as amended (42 U.S.C. 7401 et seq.). Section 112 of 
the CAA establishes a two-stage regulatory process to develop standards 
for emissions of hazardous air pollutants (HAP) from stationary 
sources. Generally, the first stage involves establishing technology-
based standards and the second stage involves evaluating those 
standards that are based on maximum achievable control technology 
(MACT) to determine whether additional standards are needed to address 
any remaining risk associated with HAP emissions. This second stage is 
commonly referred to as the ``residual risk review.'' In addition to 
the residual risk review, the CAA also requires the EPA to review 
standards set under CAA section 112 every 8 years to determine if there 
are ``developments in practices, processes, or control technologies'' 
that may be appropriate to incorporate into the standards. This review 
is commonly referred to as the ``technology review.'' When the two 
reviews are combined into a single rulemaking, it is commonly referred 
to as the ``risk and technology review.'' The discussion that follows 
identifies the most relevant statutory sections and briefly explains 
the contours of the methodology used to implement these statutory 
requirements. A more comprehensive discussion appears in the document 
titled CAA Section 112 Risk and Technology Reviews: Statutory Authority 
and Methodology, available in the docket for this rulemaking.
    In the first stage of the CAA section 112 standard setting process, 
the EPA promulgates technology-based standards under CAA section 112(d) 
for categories of sources identified as emitting one or more of the HAP 
listed in CAA section 112(b). Sources of HAP emissions are either major 
sources or area sources, and CAA section 112 establishes different

[[Page 42707]]

requirements for major source standards and area source standards. 
``Major sources'' are those that emit or have the potential to emit 10 
tons per year (tpy) or more of a single HAP or 25 tpy or more of any 
combination of HAP. All other sources are ``area sources.'' For major 
sources, CAA section 112(d)(2) provides that the technology-based 
NESHAP must reflect the maximum degree of emission reductions of HAP 
achievable (after considering cost, energy requirements, and non-air 
quality health and environmental impacts). These standards are commonly 
referred to as MACT standards. CAA section 112(d)(3) also establishes a 
minimum control level for MACT standards, known as the MACT ``floor.'' 
The EPA must also consider control options that are more stringent than 
the floor. Standards more stringent than the floor are commonly 
referred to as beyond-the-floor standards. In certain instances, as 
provided in CAA section 112(h), the EPA may set work practice standards 
where it is not feasible to prescribe or enforce a numerical emission 
standard. For area sources, CAA section 112(d)(5) gives the EPA 
discretion to set standards based on generally available control 
technologies or management practices (GACT standards) in lieu of MACT 
standards.
    The second stage in standard-setting focuses on identifying and 
addressing any remaining (i.e., ``residual'') risk according to CAA 
section 112(f). For source categories subject to MACT standards, 
section 112(f)(2) of the CAA requires the EPA to determine whether 
promulgation of additional standards is needed to provide an ample 
margin of safety to protect public health or to prevent an adverse 
environmental effect. Section 112(d)(5) of the CAA provides that this 
residual risk review is not required for categories of area sources 
subject to GACT standards. Section 112(f)(2)(B) of the CAA further 
expressly preserves the EPA's use of the two-step approach for 
developing standards to address any residual risk and the Agency's 
interpretation of ``ample margin of safety'' developed in the National 
Emissions Standards for Hazardous Air Pollutants: Benzene Emissions 
from Maleic Anhydride Plants, Ethylbenzene/Styrene Plants, Benzene 
Storage Vessels, Benzene Equipment Leaks, and Coke By-Product Recovery 
Plants (Benzene NESHAP) (54 FR 38044, September 14, 1989). The EPA 
notified Congress in the Risk Report that the Agency intended to use 
the Benzene NESHAP approach in making CAA section 112(f) residual risk 
determinations (EPA-453/R-99-001, p. ES-11). The EPA subsequently 
adopted this approach in its residual risk determinations and the 
United States Court of Appeals for the District of Columbia Circuit 
(the Court) upheld the EPA's interpretation that CAA section 112(f)(2) 
incorporates the approach established in the Benzene NESHAP. See NRDC 
v. EPA, 529 F.3d 1077, 1083 (D.C. Cir. 2008).
    The approach incorporated into the CAA and used by the EPA to 
evaluate residual risk and to develop standards under CAA section 
112(f)(2) is a two-step approach. In the first step, the EPA determines 
whether risks are acceptable. This determination ``considers all health 
information, including risk estimation uncertainty, and includes a 
presumptive limit on maximum individual lifetime [cancer] risk (MIR) 
\1\ of approximately 1 in 10 thousand.'' 54 FR 38045, September 14, 
1989. If risks are unacceptable, the EPA must determine the emissions 
standards necessary to reduce risk to an acceptable level without 
considering costs. In the second step of the approach, the EPA 
considers whether the emissions standards provide an ample margin of 
safety to protect public health ``in consideration of all health 
information, including the number of persons at risk levels higher than 
approximately 1-in-1 million, as well as other relevant factors, 
including costs and economic impacts, technological feasibility, and 
other factors relevant to each particular decision.'' Id. The EPA must 
promulgate emission standards necessary to provide an ample margin of 
safety to protect public health or determine that the standards being 
reviewed provide an ample margin of safety without any revisions. After 
conducting the ample margin of safety analysis, we consider whether a 
more stringent standard is necessary to prevent, taking into 
consideration costs, energy, safety, and other relevant factors, an 
adverse environmental effect.
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    \1\ Although defined as ``maximum individual risk,'' MIR refers 
only to cancer risk. MIR, one metric for assessing cancer risk, is 
the estimated risk if an individual were exposed to the maximum 
level of a pollutant for a lifetime.
---------------------------------------------------------------------------

    CAA section 112(d)(6) separately requires the EPA to review 
standards promulgated under CAA section 112 and revise them ``as 
necessary (taking into account developments in practices, processes, 
and control technologies)'' no less often than every 8 years. In 
conducting this review, which we call the ``technology review,'' the 
EPA is not required to recalculate the MACT floor. Natural Resources 
Defense Council (NRDC) v. EPA, 529 F.3d 1077, 1084 (D.C. Cir. 2008). 
Association of Battery Recyclers, Inc. v. EPA, 716 F.3d 667 (D.C. Cir. 
2013). The EPA may consider cost in deciding whether to revise the 
standards pursuant to CAA section 112(d)(6).

B. What is this source category and how does the current NESHAP 
regulate its HAP emissions?

    The EPA initially promulgated the Integrated Iron and Steel 
Manufacturing NESHAP on May 20, 2003 (68 FR 27646), under title 40, 
part 63, subpart FFFFF (the NESHAP). The rule was amended on July 13, 
2006 (71 FR 39579). The amendments added a new compliance option, 
revised emission limitations, reduced the frequency of repeat 
performance tests for certain emission units, added corrective action 
requirements, and clarified monitoring, recordkeeping, and reporting 
requirements. All documents used to develop the previous 2003 and 2006 
final rules can be found in either the legacy docket, A-2000-44, or the 
electronic docket, EPA-HQ-OAR-2002-0083.
    An Integrated Iron and Steel Manufacturing facility produces steel 
from iron ore pellets, coke, metal scrap, and other raw materials using 
furnaces and other processes. The Integrated Iron and Steel 
Manufacturing source category includes sinter production, iron 
preparation, iron production, and steel production. Currently there are 
10 operating facilities and one idle facility in the source category.
    The main sources of air toxics emissions from an Integrated Iron 
and Steel Manufacturing facility are from the BF; BOPF; hot metal 
transfer, desulfurization, and skimming (HMTDS) operations; ladle 
metallurgy operations; sinter plant windbox; sinter plant discharge 
end; and sinter cooler. All 11 facilities have BFs, BOPFs, HMTDS 
operations, and ladle metallurgy operations. However, only three 
facilities have sinter plants.
    The NESHAP includes emissions limits for particulate matter (PM) 
and opacity standards (both of which are surrogates for PM HAP) for 
furnaces and sinter plants. The NESHAP also includes an operating limit 
for the oil content of the sinter plant feedstock or, as an 
alternative, an emissions limit for volatile organic compounds (VOC) 
for the sinter plant windbox exhaust stream. The oil limit, and the 
alternative VOC limit, serve as surrogates for all organic HAP.

C. What data collection activities were conducted to support this 
action?

    The EPA issued a CAA section 114 information collection request 
(ICR) in

[[Page 42708]]

2010, including a facility questionnaire and source testing request, to 
nine parent companies, resulting in information for 11 facilities. 
After testing was conducted and data were submitted, two of the 11 
facilities became idle. However, one of these two facilities recently 
has restarted some of its operations. The other idle facility may shut 
down at the end of 2019.
    The facility questionnaire was composed of six parts: General 
Facility Information, Previously Performed Testing and Test Report 
Data, Process and Emissions Control Device Tables, Startups and 
Shutdowns, Energy Consumption and Energy Projects, and Economics 
Section. The compilation of the facility responses can be found in the 
docket to this proposed rulemaking (EPA-HQ-OAR-2002-0083). Source 
testing was requested for HAP metals and PM at the following point 
sources: Sinter plant windbox control device, sinter plant discharge 
end control device, BOPF primary and secondary control devices, BF 
stoves, BF control device, ladle metallurgy control devices, HMTDS 
control devices, and electric arc furnaces (EAFs) at 11 facilities. In 
addition, the sinter plant windbox control device and EAFs were 
required to test for VOC, polycyclic aromatic hydrocarbons (PAH), 
dioxins/furans, carbon disulfide, carbonyl sulfide, hydrochloric acid 
(HCl), and total hydrocarbons (THC). The compilation of source testing 
results can be found in the docket to this action (EPA-HQ-OAR-2002-
0083). The EPA sent each facility its compiled testing results for 
review and corrections and incorporated their comments and revisions. 
The ICR data for point source emissions for the 11 existing facilities 
were used in the risk assessment dataset, as needed, and included all 
source testing results and questionnaire responses (e.g., annual 
production, stack parameters, stack locations).

D. What other relevant background information and data are available?

    In addition to point sources, the EPA identified seven unmeasured 
fugitive and intermittent particulate (UFIP) emission sources for this 
industry, including BF bleeder valve unplanned openings (also known as 
slips), BF bleeder valve planned openings, BF bell leaks, BF casthouse 
fugitives, BF iron beaching, BF slag handling and storage operations, 
and BOPF shop fugitives. The UFIP sources are also referred to as 
nonpoint sources of emissions. These UFIP emission sources were 
identified by observation of visible plumes of fugitives being emitted 
from the seven UFIP sources during inspections by EPA Regional staff 
and documented in reports and photographs for years 2008 to present.\2\ 
Two of these sources, BF casthouse fugitives and BOPF shop fugitives, 
are currently regulated by opacity limits in the rule.
---------------------------------------------------------------------------

    \2\ Personal communication. B. Dickens and P. Miller, U.S. EPA 
Region V, Chicago, Illinois, with D. L. Jones, U.S. EPA, Office of 
Air Quality Planning and Standards, Office of Air and Radiation, 
U.S. EPA, Research Triangle Park, North Carolina. 2015-2018. See 
also the document titled Ample Margin of Safety for Nonpoint Sources 
in the II&S Industry, available in the docket to this rule.
---------------------------------------------------------------------------

    The following are descriptions of the BF, BOPF, and then the seven 
UFIP sources. More detail can be found in the technical memorandum 
discussed below.
     BF is a key integrated iron and steel process unit where 
molten iron is produced from raw materials such as iron ore, lime, 
sinter, and coke.
     BOPF is a key integrated iron and steel process unit where 
steel is made from molten iron, scrap steel, and alloys.
     BOPF shop is the structure that houses the entire BOPF and 
auxiliary activities, such as hot iron transfer, skimming, and 
desulfurization of the iron, which generate fugitive emissions.
     BF casthouse is the structure that houses the lower 
portion of the BF and encloses iron and slag transport operations, 
which generate fugitive emissions.
     Bleeder valve is a device at the top of the BF that, when 
open, relieves BF internal pressure to the ambient air. The valve can 
operate as both a self-actuating safety device to relieve excess 
pressure and as an operator-initiated instrument for process control. A 
bleeder valve opening means any opening of the BF bleeder valve, which 
allows gas and/or PM to flow past the sealing seat. Multiple openings 
and closings of a bleeder valve that occur within a 30-minute period 
could be considered a single bleeder valve opening. There are two types 
of openings (planned and unplanned).
     Planned bleeder valve opening means an opening that is 
initiated by an operator as part of a furnace startup, shutdown, or 
temporary idling for maintenance action. Operators can prepare the 
furnace for planned openings to minimize or eliminate emissions from 
the bleeder valves.
     Unplanned bleeder valve opening means an opening that is 
not planned and is due to excess pressure within the furnace that 
triggers opening of the valve. The pressure build up occurs when raw 
materials do not descend smoothly after being charged at the top of the 
BF and accumulate in large masses within the furnace. When the large 
masses finally are dislodged due to their weight, a pressure surge 
results.
     Slag is a by-product containing impurities that is 
released from the BF along with molten iron when the BF is tapped from 
the bottom of the furnace. The slag is less dense than iron and, 
therefore, floats on top and is removed by skimmers and then 
transported to open pits to cool to enable later removal. Usually there 
is one slag pit for every BF.
     Iron beaching occurs when iron from BF cannot be charged 
to the BOPF because of problems in steelmaking units; the hot molten 
iron from the BF is placed onto the ground, in some cases within a 3-
sided structure.
     BF bells are part of the charging system on top of the 
furnace that allows for materials to be loaded into the furnace or next 
bell (as in the case of small bells) without letting BF gas escape. It 
is a two-bell system, where a smaller bell is above a larger bell. 
These bells need to have a tight seal onto the blast furnace when not 
in use for charging so that BF gas and uncontrolled emissions do not 
escape to the atmosphere. But over time, the surfaces that seal the 
bells wear down and need to be repaired (as for small bells) or 
replaced (as for large bells). If these seals are not repaired or 
replaced in a timely manner, emissions of HAP (and PM) can increase 
significantly.
    The EPA used several resources, including industry consultation, 
AP-42 emission factors, EPA studies, and other published technical 
documents to estimate emissions for the UFIP (or nonpoint) sources and 
to conduct a risk assessment for an example facility with the highest 
production in the industry. The risk assessment is explained in section 
III.C.3 below.
    The seven UFIP sources and development of emissions estimates for 
these sources at the example facility are described in detail in two 
technical memoranda. One memorandum titled Ample Margin of Safety for 
Nonpoint Sources in the II&S Industry, available in the docket for this 
rule, describes the seven UFIP sources, work practices for control of 
HAP (and PM) emissions, the estimated costs of these work practices, 
and the estimated risk before and after implementation of work 
practices. The other memorandum, titled Development of Emissions 
Estimates for Fugitive or Intermittent HAP Emission Sources for an 
Example Integrated Iron and Steel Manufacturing Facility for Input to 
the RTR Risk Assessment, also available in the docket, describes: (1) 
The development of emissions estimates for UFIP from processes where 
emissions

[[Page 42709]]

from UFIP are thought to occur; (2) estimates of PM emissions from 
these processes at an example facility; (3) HAP to PM ratios used to 
estimate HAP emissions from the PM emissions estimates; and (4) the 
resulting HAP emissions estimated for the example facility. The 
memorandum also presents the modeling parameters used to model the 
dispersion of the HAP emitted from UFIP sources at the example 
facility, the results of the example facility risk assessment, and a 
comparison of the risk assessment results to data from an ambient 
monitor near the example facility.

III. Analytical Procedures and Decision-Making

    In this section, we describe the analyses performed to support the 
proposed decisions for the RTR and other issues addressed in this 
proposal.

A. How do we consider risk in our decision-making?

    As discussed in section II.A of this preamble and in the Benzene 
NESHAP, in evaluating and developing standards under CAA section 
112(f)(2), we apply a two-step approach to determine whether or not 
risks are acceptable and to determine if the standards provide an ample 
margin of safety to protect public health. As explained in the Benzene 
NESHAP, ``the first step judgment on acceptability cannot be reduced to 
any single factor'' and, thus, ``[t]he Administrator believes that the 
acceptability of risk under section 112 is best judged on the basis of 
a broad set of health risk measures and information.'' 54 FR 38046, 
September 14, 1989. Similarly, with regard to the ample margin of 
safety determination, ``the Agency again considers all of the health 
risk and other health information considered in the first step. Beyond 
that information, additional factors relating to the appropriate level 
of control will also be considered, including cost and economic impacts 
of controls, technological feasibility, uncertainties, and any other 
relevant factors.'' Id.
    The Benzene NESHAP approach provides flexibility regarding factors 
the EPA may consider in making determinations and how the EPA may weigh 
those factors for each source category. The EPA conducts a risk 
assessment that provides estimates of the MIR posed by the HAP 
emissions from each source in the source category, the hazard index 
(HI) for chronic exposures to HAP with the potential to cause noncancer 
health effects, and the hazard quotient (HQ) for acute exposures to HAP 
with the potential to cause noncancer health effects.\3\ The assessment 
also provides estimates of the distribution of cancer risk within the 
exposed populations, cancer incidence, and an evaluation of the 
potential for an adverse environmental effect. The scope of EPA's risk 
analysis is consistent with the EPA's response to comments on our 
policy under the Benzene NESHAP where the EPA explained that:
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    \3\ The MIR is defined as the cancer risk associated with a 
lifetime of exposure at the highest concentration of HAP where 
people are likely to live. The HQ is the ratio of the potential HAP 
exposure concentration to the noncancer dose-response value; the HI 
is the sum of HQs for HAP that affect the same target organ or organ 
system.

    ``[t]he policy chosen by the Administrator permits consideration 
of multiple measures of health risk. Not only can the MIR figure be 
considered, but also incidence, the presence of non-cancer health 
effects, and the uncertainties of the risk estimates. In this way, 
the effect on the most exposed individuals can be reviewed as well 
as the impact on the general public. These factors can then be 
weighed in each individual case. This approach complies with the 
Vinyl Chloride mandate that the Administrator ascertain an 
acceptable level of risk to the public by employing his expertise to 
assess available data. It also complies with the Congressional 
intent behind the CAA, which did not exclude the use of any 
particular measure of public health risk from the EPA's 
consideration with respect to CAA section 112 regulations, and 
thereby implicitly permits consideration of any and all measures of 
health risk which the Administrator, in his judgment, believes are 
---------------------------------------------------------------------------
appropriate to determining what will `protect the public health'.''

    See 54 FR 38057, September 14, 1989. Thus, the level of the MIR is 
only one factor to be weighed in determining acceptability of risk. The 
Benzene NESHAP explained that ``an MIR of approximately one in 10 
thousand should ordinarily be the upper end of the range of 
acceptability. As risks increase above this benchmark, they become 
presumptively less acceptable under CAA section 112, and would be 
weighed with the other health risk measures and information in making 
an overall judgment on acceptability. Or, the Agency may find, in a 
particular case, that a risk that includes an MIR less than the 
presumptively acceptable level is unacceptable in the light of other 
health risk factors.'' Id. at 38045. In other words, risks that include 
an MIR above 100-in-1 million may be determined to be acceptable, and 
risks with an MIR below that level may be determined to be 
unacceptable, depending on all of the available health information. 
Similarly, with regard to the ample margin of safety analysis, the EPA 
stated in the Benzene NESHAP that: ``EPA believes the relative weight 
of the many factors that can be considered in selecting an ample margin 
of safety can only be determined for each specific source category. 
This occurs mainly because technological and economic factors (along 
with the health-related factors) vary from source category to source 
category.'' Id. at 38061. We also consider the uncertainties associated 
with the various risk analyses, as discussed earlier in this preamble, 
in our determinations of acceptability and ample margin of safety.
    The EPA notes that it has not considered certain health information 
to date in making residual risk determinations. At this time, we do not 
attempt to quantify the HAP risk that may be associated with emissions 
from other facilities that do not include the source category under 
review, mobile source emissions, natural source emissions, persistent 
environmental pollution, or atmospheric transformation in the vicinity 
of the sources in the category.
    The EPA understands the potential importance of considering an 
individual's total exposure to HAP in addition to considering exposure 
to HAP emissions from the source category and facility. We recognize 
that such consideration may be particularly important when assessing 
noncancer risk, where pollutant-specific exposure health reference 
levels (e.g., reference concentrations (RfCs)) are based on the 
assumption that thresholds exist for adverse health effects. For 
example, the EPA recognizes that, although exposures attributable to 
emissions from a source category or facility alone may not indicate the 
potential for increased risk of adverse noncancer health effects in a 
population, the exposures resulting from emissions from the facility in 
combination with emissions from all of the other sources (e.g., other 
facilities) to which an individual is exposed may be sufficient to 
result in an increased risk of adverse noncancer health effects. In May 
2010, the Science Advisory Board (SAB) advised the EPA ``that RTR 
assessments will be most useful to decision makers and communities if 
results are presented in the broader context of aggregate and 
cumulative risks, including background concentrations and contributions 
from other sources in the area.'' \4\
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    \4\ Recommendations of the SAB Risk and Technology Review 
Methods Panel are provided in their report, which is available at: 
https://yosemite.epa.gov/sab/sabproduct.nsf/
4AB3966E263D943A8525771F00668381/$File/EPA-SAB-10-007-unsigned.pdf.
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    In response to the SAB recommendations, the EPA incorporates

[[Page 42710]]

cumulative risk analyses into its RTR risk assessments, including those 
reflected in this proposal. The Agency (1) conducts facility-wide 
assessments, which include source category emission points, as well as 
other emission points within the facilities; (2) combines exposures 
from multiple sources in the same category that could affect the same 
individuals; and (3) for some persistent and bioaccumulative 
pollutants, analyzes the ingestion route of exposure. In addition, the 
RTR risk assessments consider aggregate cancer risk from all 
carcinogens and aggregated noncancer HQs for all noncarcinogens 
affecting the same target organ or target organ system.
    Although we are interested in placing source category and facility-
wide HAP risk in the context of total HAP risk from all sources 
combined in the vicinity of each source, we are concerned about the 
uncertainties of doing so. Estimates of total HAP risk from emission 
sources other than those that we have studied in depth during this RTR 
review would have significantly greater associated uncertainties than 
the source category or facility-wide estimates. Such aggregate or 
cumulative assessments would compound those uncertainties, making the 
assessments too unreliable.

B. How do we perform the technology review?

    Our technology review focuses on the identification and evaluation 
of developments in practices, processes, and control technologies that 
have occurred since the MACT standards were promulgated. Where we 
identify such developments, we analyze their technical feasibility, 
estimated costs, energy implications, and non-air environmental 
impacts. We also consider the emission reductions associated with 
applying each development. This analysis informs our decision of 
whether it is ``necessary'' to revise the emissions standards. In 
addition, we consider the appropriateness of applying controls to new 
sources versus retrofitting existing sources. For this exercise, we 
consider any of the following to be a ``development'':
     Any add-on control technology or other equipment that was 
not identified and considered during development of the original MACT 
standards;
     Any improvements in add-on control technology or other 
equipment (that were identified and considered during development of 
the original MACT standards) that could result in additional emissions 
reduction;
     Any work practice or operational procedure that was not 
identified or considered during development of the original MACT 
standards;
     Any process change or pollution prevention alternative 
that could be broadly applied to the industry and that was not 
identified or considered during development of the original MACT 
standards; and
     Any significant changes in the cost (including cost 
effectiveness) of applying controls (including controls the EPA 
considered during the development of the original MACT standards).
    In addition to reviewing the practices, processes, and control 
technologies that were considered at the time we originally developed 
(or last updated) the NESHAP, we review a variety of data sources in 
our investigation of potential practices, processes, or controls to 
consider. See sections II.C and II. D of this preamble for information 
on the specific data sources that were reviewed as part of the 
technology review.

C. How do we estimate post-MACT risk posed by the source category?

    In this section, we provide a complete description of the types of 
analyses that we generally perform during the risk assessment process. 
In some cases, we do not perform a specific analysis because it is not 
relevant. For example, in the absence of emissions of HAP known to be 
persistent and bioaccumulative in the environment (PB-HAP), we would 
not perform a multipathway exposure assessment. Where we do not perform 
an analysis, we state that we do not and provide the reason. While we 
present all of our risk assessment methods, we only present risk 
assessment results for the analyses actually conducted (see section 
IV.A of this preamble).
    The EPA conducts a risk assessment that provides estimates of the 
MIR for cancer posed by the HAP emissions from each source in the 
source category, the HI for chronic exposures to HAP with the potential 
to cause noncancer health effects, and the HQ for acute exposures to 
HAP with the potential to cause noncancer health effects. The 
assessment also provides estimates of the distribution of cancer risk 
within the exposed populations, cancer incidence, and an evaluation of 
the potential for an adverse environmental effect. The eight sections 
that follow this paragraph describe how we estimated emissions and 
conducted the risk assessment. The docket for this rulemaking contains 
the following document which provides more information on the risk 
assessment inputs and models: Residual Risk Assessment for the 
Integrated Iron and Steel Manufacturing Source Category in Support of 
the 2019 Risk and Technology Review Proposed Rule. The methods used to 
assess risk (as described in the eight primary steps below) are 
consistent with those described by the EPA in the document reviewed by 
a panel of the EPA's SAB in 2009; \5\ and described in the SAB review 
report issued in 2010. They are also consistent with the key 
recommendations contained in that report.
---------------------------------------------------------------------------

    \5\ U.S. EPA. Risk and Technology Review (RTR) Risk Assessment 
Methodologies: For Review by the EPA's Science Advisory Board with 
Case Studies--MACT I Petroleum Refining Sources and Portland Cement 
Manufacturing, June 2009. EPA-452/R-09-006. Accessed at: https://www3.epa.gov/airtoxics/rrisk/rtrpg.html.
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1. How did we estimate actual emissions and identify the emissions 
release characteristics?
    The point sources at Integrated Iron and Steel Manufacturing 
facilities include the BOPF primary and secondary control devices, BF 
stoves, BF control device, ladle metallurgy control devices, HMTDS 
control devices, BF cooling tower, sinter plant windbox control 
devices, and sinter plant discharge end control devices. Emissions 
estimates and release characteristics for all metal HAP (including 
mercury) for all the above affected point sources were derived from 
stack test data obtained through the ICR. In addition, emissions 
estimates and release characteristics for VOC, PAH, dioxins/furans, 
carbon disulfide, carbonyl sulfide, and THC were developed from stack 
test data at the exit from the sinter plant windbox control device that 
were obtained through the ICR. The derivation of all actual emissions 
estimates and release characteristics for point sources at Integrated 
Iron and Steel Manufacturing facilities are discussed in more detail in 
the document: Integrated Iron and Steel Data Summary for Risk and 
Technology Review, available in the docket for this proposed 
rulemaking.
    As mentioned in section II.D above, emissions also were estimated 
for seven nonpoint sources for an example facility with the highest 
steel production in the industry. The seven UFIP sources and 
development of emissions estimates for these sources at the example 
facility are described in detail in the technical memorandum titled 
Development of Emissions Estimates for Fugitive or Intermittent HAP 
Emission Sources for an Example Integrated Iron and Steel Manufacturing 
Facility for Input to the

[[Page 42711]]

RTR Risk Assessment, available in the docket to this rule and 
summarized above.
2. How did we estimate MACT-allowable emissions?
    The available emissions data in the RTR emissions dataset include 
estimates of the mass of HAP emitted during a specified annual time 
period. These ``actual'' emission levels are often lower than the 
emission levels allowed under the requirements of the current MACT 
standards. The emissions allowed under the MACT standards are referred 
to as the ``MACT-allowable'' emissions. We discussed the consideration 
of both MACT-allowable and actual emissions in the final Coke Oven 
Batteries RTR (70 FR 19998-19999, April 15, 2005) and in the proposed 
and final Hazardous Organic NESHAP RTR (71 FR 34428, June 14, 2006, and 
71 FR 76609, December 21, 2006, respectively). In those actions, we 
noted that assessing the risk at the MACT-allowable level is inherently 
reasonable since that risk reflects the maximum level facilities could 
emit and still comply with national emission standards. We also 
explained that it is reasonable to consider actual emissions, where 
such data are available, in both steps of the risk analysis, in 
accordance with the Benzene NESHAP approach. (54 FR 38044, September 
14, 1989.)
    Allowable emissions were calculated two ways, depending on the 
pollutant and whether PM was used as a surrogate for the pollutant in 
this NESHAP. The allowable emissions were set equal to the actual 
emissions for the following pollutants for which PM is not a surrogate: 
(1) Mercury (total) from all process units; (2) carbon disulfide, 
carbonyl sulfide, dioxins/furans, HCl, naphthalene, PAH, benzene, 
toluene, ethyl benzene, and xylenes from the sinter plant windbox; and 
(3) hydrogen cyanide from the BF waste water cooling tower. For the 
non-mercury metal HAP, which were regulated as PM in the NESHAP through 
emissions and opacity standards, the allowable emissions were estimated 
using a ratio of the current PM emissions standard to actual PM 
emissions measured in the ICR performance tests and applied to actual 
emissions measured for each non-mercury metal HAP in the ICR. Further 
details regarding the development of allowable emissions estimates are 
provided in the following document that summarizes all of the emissions 
and assumptions used to develop annual emissions for Integrated Iron 
and Steel Manufacturing facilities using the data from source test 
reports and other parts of the ICR: Integrated Iron and Steel Data 
Summary for Risk and Technology Review, available in the docket for 
this proposed rulemaking.
3. How do we conduct dispersion modeling, determine inhalation 
exposures, and estimate individual and population inhalation risk?
    Both long-term and short-term inhalation exposure concentrations 
and health risk from the source category addressed in this proposal 
were estimated using the Human Exposure Model (HEM-3).\6\ The HEM-3 
performs three primary risk assessment activities: (1) Conducting 
dispersion modeling to estimate the concentrations of HAP in ambient 
air, (2) estimating long-term and short-term inhalation exposures to 
individuals residing within 50 kilometers (km) of the modeled sources, 
and (3) estimating individual and population-level inhalation risk 
using the exposure estimates and quantitative dose-response 
information.
---------------------------------------------------------------------------

    \6\ For more information about HEM-3, go to https://www.epa.gov/fera/risk-assessment-and-modeling-human-exposure-model-hem.
---------------------------------------------------------------------------

a. Dispersion Modeling
    The air dispersion model AERMOD, used by the HEM-3 model, is one of 
the EPA's preferred models for assessing air pollutant concentrations 
from industrial facilities.\7\ To perform the dispersion modeling and 
to develop the preliminary risk estimates, HEM-3 draws on three data 
libraries. The first is a library of meteorological data, which is used 
for dispersion calculations. This library includes 1 year (2016) of 
hourly surface and upper air observations from 824 meteorological 
stations, selected to provide coverage of the United States and Puerto 
Rico. A second library of United States Census Bureau census block \8\ 
internal point locations and populations provides the basis of human 
exposure calculations (U.S. Census, 2010). In addition, for each census 
block, the census library includes the elevation and controlling hill 
height, which are also used in dispersion calculations. A third library 
of pollutant-specific dose-response values is used to estimate health 
risk. These are discussed below.
---------------------------------------------------------------------------

    \7\ U.S. EPA. Revision to the Guideline on Air Quality Models: 
Adoption of a Preferred General Purpose (Flat and Complex Terrain) 
Dispersion Model and Other Revisions (70 FR 68218, November 9, 
2005).
    \8\ A census block is the smallest geographic area for which 
census statistics are tabulated.
---------------------------------------------------------------------------

b. Risk From Chronic Exposure to HAP
    In developing the risk assessment for chronic exposures, we use the 
estimated annual average ambient air concentrations of each HAP emitted 
by each source in the source category. The HAP air concentrations at 
each nearby census block centroid located within 50 km of the facility 
are a surrogate for the chronic inhalation exposure concentration for 
all the people who reside in that census block. A distance of 50 km is 
consistent with both the analysis supporting the 1989 Benzene NESHAP 
(54 FR 38044, September 14, 1989) and the limitations of Gaussian 
dispersion models, including AERMOD.
    For each facility, we calculate the MIR as the cancer risk 
associated with a continuous lifetime (24 hours per day, 7 days per 
week, 52 weeks per year, 70 years) exposure to the maximum 
concentration at the centroid of each inhabited census block. We 
calculate individual cancer risk by multiplying the estimated lifetime 
exposure to the ambient concentration of each HAP, in micrograms per 
cubic meter ([mu]g/m\3\), by its unit risk estimate (URE). The URE is 
an upper-bound estimate of an individual's incremental risk of 
contracting cancer over a lifetime of exposure to a concentration of 1 
microgram of the pollutant per cubic meter of air. For residual risk 
assessments, we generally use UREs from the EPA's Integrated Risk 
Information System (IRIS). For carcinogenic pollutants without IRIS 
values, we look to other reputable sources of cancer dose-response 
values, often using California EPA (CalEPA) UREs, where available. In 
cases where new, scientifically credible dose-response values have been 
developed in a manner consistent with the EPA guidelines and have 
undergone a peer review process similar to that used by the EPA, we may 
use such dose-response values in place of, or in addition to, other 
values, if appropriate. The pollutant-specific dose-response values 
used to estimate health risk are available at https://www.epa.gov/fera/dose-response-assessment-assessing-health-risks-associated-exposure-hazardous-air-pollutants.
    To estimate individual lifetime cancer risks associated with 
exposure to HAP emissions from each facility in the source category, we 
sum the risks for each of the carcinogenic HAP \9\ emitted

[[Page 42712]]

by the modeled facility. We estimate cancer risk at every census block 
within 50 km of every facility in the source category. The MIR is the 
highest individual lifetime cancer risk estimated for any of those 
census blocks. In addition to calculating the MIR, we estimate the 
distribution of individual cancer risks for the source category by 
summing the number of individuals within 50 km of the sources whose 
estimated risk falls within a specified risk range. We also estimate 
annual cancer incidence by multiplying the estimated lifetime cancer 
risk at each census block by the number of people residing in that 
block, summing results for all of the census blocks, and then dividing 
this result by a 70-year lifetime.
---------------------------------------------------------------------------

    \9\ The EPA's 2005 Guidelines for Carcinogen Risk Assessment 
classifies carcinogens as: ``carcinogenic to humans,'' ``likely to 
be carcinogenic to humans,'' and ``suggestive evidence of 
carcinogenic potential.'' These classifications also coincide with 
the terms ``known carcinogen, probable carcinogen, and possible 
carcinogen,'' respectively, which are the terms advocated in the 
EPA's Guidelines for Carcinogen Risk Assessment, published in 1986 
(51 FR 33992, September 24, 1986). In August 2000, the document 
Supplemental Guidance for Conducting Health Risk Assessment of 
Chemical Mixtures (EPA/630/R-00/002), was published as a supplement 
to the 1986 document. Copies of both documents can be obtained from 
https://cfpub.epa.gov/ncea/risk/recordisplay.cfm?deid=20533&CFID=70315376&CFTOKEN=71597944. Summing 
the risk of these individual compounds to obtain the cumulative 
cancer risk is an approach that was recommended by the EPA's SAB in 
their 2002 peer review of the EPA's National Air Toxics Assessment 
(NATA) titled NATA--Evaluating the National-scale Air Toxics 
Assessment 1996 Data--an SAB Advisory, available at https://
yosemite.epa.gov/sab/sabproduct.nsf/
214C6E915BB04E14852570CA007A682C/$File/ecadv02001.pdf.
---------------------------------------------------------------------------

    To assess the risk of noncancer health effects from chronic 
exposure to HAP, we calculate either an HQ or a target organ-specific 
hazard index (TOSHI). We calculate an HQ when a single noncancer HAP is 
emitted. Where more than one noncancer HAP is emitted, we sum the HQ 
for each of the HAP that affects a common target organ or target organ 
system to obtain a TOSHI. The HQ is the estimated exposure divided by 
the chronic noncancer dose-response value, which is a value selected 
from one of several sources. The preferred chronic noncancer dose-
response value is the EPA RfC, defined as ``an estimate (with 
uncertainty spanning perhaps an order of magnitude) of a continuous 
inhalation exposure to the human population (including sensitive 
subgroups) that is likely to be without an appreciable risk of 
deleterious effects during a lifetime'' (https://iaspub.epa.gov/sor_internet/registry/termreg/searchandretrieve/glossariesandkeywordlists/search.do?details=&vocabName=IRIS%20Glossary). In cases where an RfC 
from the EPA's IRIS is not available or where the EPA determines that 
using a value other than the RfC is appropriate, the chronic noncancer 
dose-response value can be a value from the following prioritized 
sources, which define their dose-response values similarly to EPA: (1) 
The Agency for Toxic Substances and Disease Registry (ATSDR) Minimum 
Risk Level (https://www.atsdr.cdc.gov/mrls/index.asp); (2) the CalEPA 
Chronic Reference Exposure Level (REL) (https://oehha.ca.gov/air/crnr/notice-adoption-air-toxics-hot-spots-program-guidance-manual-preparation-health-risk-0); or (3), as noted above, a scientifically 
credible dose-response value that has been developed in a manner 
consistent with the EPA guidelines and has undergone a peer review 
process similar to that used by the EPA. The pollutant-specific dose-
response values used to estimate health risks are available at https://www.epa.gov/fera/dose-response-assessment-assessing-health-risks-associated-exposure-hazardous-air-pollutants.
c. Risk From Acute Exposure to HAP That May Cause Health Effects Other 
Than Cancer
    For each HAP for which appropriate acute inhalation dose-response 
values are available, the EPA also assesses the potential health risks 
due to acute exposure. For these assessments, the EPA makes 
conservative assumptions about emission rates, meteorology, and 
exposure location. In this proposed rulemaking, as part of our efforts 
to continually improve our methodologies to evaluate the risks that HAP 
emitted from categories of industrial sources pose to human health and 
the environment,\10\ we are revising our treatment of meteorological 
data to use reasonable worst-case air dispersion conditions in our 
acute risk screening assessments instead of worst-case air dispersion 
conditions. This revised treatment of meteorological data and the 
supporting rationale are described in more detail in Residual Risk 
Assessment for Integrated Iron and Steel Manufacturing Source Category 
in Support of the 2019 Risk and Technology Review Proposed Rule and in 
Appendix 5 of the report: Technical Support Document for Acute Risk 
Screening Assessment. We will be applying this revision in RTR 
rulemakings proposed on or after June 3, 2019.
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    \10\ See, e.g., U.S. EPA. Screening Methodologies to Support 
Risk and Technology Reviews (RTR): A Case Study Analysis (Draft 
Report, May 2017, https://www3.epa.gov/ttn/atw/rrisk/rtrpg.html).
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    To assess the potential acute risk to the maximally exposed 
individual, we use the peak hourly emission rate for each emission 
point,\11\ reasonable worst-case air dispersion conditions, and the 
point of highest off-site exposure. Specifically, we assume that peak 
emissions from the source category and reasonable worst-case air 
dispersion conditions co-occur and that a person is present at the 
point of maximum exposure.
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    \11\ In the absence of hourly emission data, we develop 
estimates of maximum hourly emission rates by multiplying the 
average actual annual emissions rates by a factor (either a 
category-specific factor or a default factor of 10) to account for 
variability. This is documented in Residual Risk Assessment for 
Integrated Iron and Steel Manufacturing Source Category in Support 
of the 2019 Risk and Technology Review Proposed Rule and in Appendix 
5 of the report titled Technical Support Document for Acute Risk 
Screening Assessment. Both are available in the docket for this 
rulemaking.
---------------------------------------------------------------------------

    To characterize the potential health risks associated with 
estimated acute inhalation exposures to a HAP, we generally use 
multiple acute dose-response values, including acute RELs, acute 
exposure guideline levels (AEGLs), and emergency response planning 
guidelines (ERPG) for 1-hour exposure durations), if available, to 
calculate acute HQs. The acute HQ is calculated by dividing the 
estimated acute exposure concentration by the acute dose-response 
value. For each HAP for which acute dose-response values are available, 
the EPA calculates acute HQs.
    An acute REL is defined as ``the concentration level at or below 
which no adverse health effects are anticipated for a specified 
exposure duration.'' \12\ Acute RELs are based on the most sensitive, 
relevant, adverse health effect reported in the peer-reviewed medical 
and toxicological literature. They are designed to protect the most 
sensitive individuals in the population through the inclusion of 
margins of safety. Because margins of safety are incorporated to 
address data gaps and uncertainties, exceeding the REL does not 
automatically indicate an adverse health impact. AEGLs represent 
threshold exposure limits for the general public and are applicable to 
emergency exposures ranging from 10 minutes to 8 hours.\13\ They are 
guideline levels for

[[Page 42713]]

``once-in-a-lifetime, short-term exposures to airborne concentrations 
of acutely toxic, high-priority chemicals.'' Id. at 21. The AEGL-1 is 
specifically defined as ``the airborne concentration (expressed as ppm 
(parts per million) or mg/m\3\ (milligrams per cubic meter)) of a 
substance above which it is predicted that the general population, 
including susceptible individuals, could experience notable discomfort, 
irritation, or certain asymptomatic nonsensory effects. However, the 
effects are not disabling and are transient and reversible upon 
cessation of exposure.'' The document also notes that ``Airborne 
concentrations below AEGL-1 represent exposure levels that can produce 
mild and progressively increasing but transient and nondisabling odor, 
taste, and sensory irritation or certain asymptomatic, nonsensory 
effects.'' Id. AEGL-2 are defined as ``the airborne concentration 
(expressed as parts per million or milligrams per cubic meter) of a 
substance above which it is predicted that the general population, 
including susceptible individuals, could experience irreversible or 
other serious, long-lasting adverse health effects or an impaired 
ability to escape.'' Id.
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    \12\ CalEPA issues acute RELs as part of its Air Toxics Hot 
Spots Program, and the 1-hour and 8-hour values are documented in 
Air Toxics Hot Spots Program Risk Assessment Guidelines, Part I, The 
Determination of Acute Reference Exposure Levels for Airborne 
Toxicants, which is available at https://oehha.ca.gov/air/general-info/oehha-acute-8-hour-and-chronic-reference-exposure-level-rel-summary.
    \13\ National Academy of Sciences, 2001, document titled 
Standing Operating Procedures for Developing Acute Exposure Levels 
for Hazardous Chemicals, on page 2. Available at https://www.epa.gov/sites/production/files/2015-09/documents/sop_final_standing_operating_procedures_2001.pdf. Note that the 
National Advisory Committee for Acute Exposure Guideline Levels for 
Hazardous Substances ended in October 2011, but the AEGL program 
continues to operate at the EPA and works with the National 
Academies to publish final AEGLs (https://www.epa.gov/aegl).
---------------------------------------------------------------------------

    ERPGs are ``developed for emergency planning and are intended as 
health-based guideline concentrations for single exposures to 
chemicals.'' \14\ Id. at 1. The ERPG-1 is defined as ``the maximum 
airborne concentration below which it is believed that nearly all 
individuals could be exposed for up to 1 hour without experiencing 
other than mild transient adverse health effects or without perceiving 
a clearly defined, objectionable odor.'' Id. at 2. Similarly, the ERPG-
2 is defined as ``the maximum airborne concentration below which it is 
believed that nearly all individuals could be exposed for up to one 
hour without experiencing or developing irreversible or other serious 
health effects or symptoms which could impair an individual's ability 
to take protective action.'' Id. at 1.
---------------------------------------------------------------------------

    \14\ ERPGS Procedures and Responsibilities. March 2014. American 
Industrial Hygiene Association. Available at: https://www.aiha.org/get-involved/AIHAGuidelineFoundation/EmergencyResponsePlanningGuidelines/Documents/ERPG%20Committee%20Standard%20Operating%20Procedures%20%20-%20March%202014%20Revision%20%28Updated%2010-2-2014%29.pdf.
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    An acute REL for 1-hour exposure durations is typically lower than 
its corresponding AEGL-1 and ERPG-1. Even though their definitions are 
slightly different, AEGL-1s are often the same as the corresponding 
ERPG-1s, and AEGL-2s are often equal to ERPG-2s. The maximum HQs from 
our acute inhalation screening risk assessment typically result when we 
use the acute REL for a HAP. In cases where the maximum acute HQ 
exceeds 1, we also report the HQ based on the next highest acute dose-
response value (usually the AEGL-1 and/or the ERPG-1).
    For this source category, a factor of 2 was applied to the actual 
emissions to calculate the acute emissions. The multiplier is based on 
the NESHAP provision that allows an opacity (20 percent) once per steel 
production cycle that is twice the opacity limit applicable at all 
other times (10 percent). For buildings that house BOPF operations, the 
rule states: ``You must not cause to be discharged to the atmosphere 
any secondary emissions . . . that exhibit opacity (for any set of 6-
minute averages) greater than 10 percent, except that one 6-minute 
period not to exceed 20 percent may occur once per steel production 
cycle.'' (see Table 1 to subpart FFFFF).
    In our acute inhalation screening risk assessment, acute impacts 
are deemed negligible for HAP for which acute HQs are less than or 
equal to 1, and no further analysis is performed for these HAP. In 
cases where an acute HQ from the screening step is greater than 1, we 
assess the site-specific data to ensure that the acute HQ is at an off-
site location.
4. How do we conduct the multipathway exposure and risk screening 
assessment?
    The EPA conducts a tiered screening assessment examining the 
potential for significant human health risks due to exposures via 
routes other than inhalation (i.e., ingestion). We first determine 
whether any sources in the source category emit any HAP known to be 
persistent and bioaccumulative in the environment, as identified in the 
EPA's Air Toxics Risk Assessment Library (see Volume 1, Appendix D, at 
https://www.epa.gov/fera/risk-assessment-and-modeling-air-toxics-risk-assessment-reference-library.
    For the Integrated Iron and Steel Manufacturing source category, we 
identified PB-HAP emissions of arsenic, cadmium, dioxins/furans, lead, 
mercury and polycyclic organic matter (POM), so we proceeded to the 
next step of the evaluation. Except for lead, the human health risk 
screening assessment for PB-HAP consists of three progressive tiers. In 
a Tier 1 screening assessment, we determine whether the magnitude of 
the facility-specific emissions of PB-HAP warrants further evaluation 
to characterize human health risk through ingestion exposure. To 
facilitate this step, we evaluate emissions against previously 
developed screening threshold emission rates for several PB-HAP that 
are based on a hypothetical upper-end screening exposure scenario 
developed for use in conjunction with the EPA's Total Risk Integrated 
Methodology Fate, Transport, and Ecological Exposure (TRIM.FaTE) model. 
The PB-HAP with screening threshold emission rates are arsenic 
compounds, cadmium compounds, chlorinated dibenzodioxins and furans, 
mercury compounds, and POM. Based on EPA estimates of toxicity and 
bioaccumulation potential, these pollutants represent a conservative 
list for inclusion in multipathway risk assessments for RTR rules (see 
Volume 1, Appendix D at https://www.epa.gov/sites/production/files/2013-08/documents/volume_1_reflibrary.pdf.) In this assessment, we 
compare the facility-specific emission rates of these PB-HAP to the 
screening threshold emission rates for each PB-HAP to assess the 
potential for significant human health risks via the ingestion pathway. 
We call this application of the TRIM.FaTE model the Tier 1 screening 
assessment. The ratio of a facility's actual emission rate to the Tier 
1 screening threshold emission rate is a ``screening value'' (SV).
    We derive the Tier 1 screening threshold emission rates for these 
PB-HAP (other than lead compounds) to correspond to a maximum excess 
lifetime cancer risk of 1-in-1 million (i.e., for arsenic compounds, 
chlorinated dibenzodioxins and furans and POM), or, for HAP that cause 
noncancer health effects (i.e., cadmium compounds and mercury 
compounds), a maximum HQ of 1. If the emission rate of any one PB-HAP 
or combination of carcinogenic PB-HAP in the Tier 1 screening 
assessment exceeds the Tier 1 screening threshold emission rate for any 
facility (i.e., the SV is greater than 1), we conduct a second 
screening assessment, which we call the Tier 2 screening assessment. 
The Tier 2 screening assessment separates the Tier 1 combined fisher 
and farmer exposure scenario into fisher, farmer, and gardener 
scenarios that retain upper-bound ingestion rates.
    In the Tier 2 screening assessment, the location of each facility 
that exceeds a Tier 1 screening threshold emission rate is used to 
refine the assumptions associated with the Tier 1 fisher and farmer 
exposure scenarios at that facility. A key assumption in the Tier 1 
screening assessment is that a lake and/or farm is located near the 
facility. As part of the Tier 2 screening assessment, we use a U.S. 
Geological Survey (USGS) database to identify actual waterbodies

[[Page 42714]]

within 50 km of each facility and assume the fisher only consumes fish 
from lakes within that 50 km zone. We also examine the differences 
between local meteorology near the facility and the meteorology used in 
the Tier 1 screening assessment. We then adjust the previously-
developed Tier 1 screening threshold emission rates for each PB-HAP for 
each facility based on an understanding of how exposure concentrations 
estimated for the screening scenario change with the use of local 
meteorology and USGS lakes database. In the Tier 2 farmer scenario, we 
maintain an assumption that the farm is located within 0.5 km of the 
facility and that the farmer consumes meat, eggs, dairy, vegetables, 
and fruit produced near the facility. We may further refine the Tier 2 
screening analysis by assessing a gardener scenario to characterize a 
range of exposures, with the gardener scenario being more plausible in 
RTR evaluations. Under the gardener scenario, we assume the gardener 
consumes home-produced eggs, vegetables, and fruit products at the same 
ingestion rate as the farmer. The Tier 2 screen continues to rely the 
high-end food intake assumptions that were applied in Tier 1 for local 
fish (adult female angler at 99th percentile fish consumption \15\) and 
locally grown or raised foods (90th percentile consumption of locally 
grown or raised foods for the farmer and gardener scenarios \16\). If 
PB-HAP emission rates do not result in a Tier 2 SV greater than 1, we 
consider those PB-HAP emissions to pose risks below a level of concern. 
If the PB-HAP emission rates for a facility exceed the Tier 2 screening 
threshold emission rates, we may conduct a Tier 3 screening assessment.
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    \15\ Burger, J. 2002. Daily consumption of wild fish and game: 
Exposures of high end recreationists. International Journal of 
Environmental Health Research 12:343-354.
    \16\ U.S. EPA. Exposure Factors Handbook 2011 Edition (Final). 
U.S. Environmental Protection Agency, Washington, DC, EPA/600/R-09/
052F, 2011.
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    There are several analyses that can be included in a Tier 3 
screening assessment, depending upon the extent of refinement 
warranted, including validating that the lakes are fishable, locating 
residential/garden locations for urban and/or rural settings, 
considering plume-rise to estimate emissions lost above the mixing 
layer, and considering hourly effects of meteorology and plume rise on 
chemical fate and transport (a time-series analysis). If necessary, the 
EPA may further refine the screening assessment through a site-specific 
assessment.
    In evaluating the potential multipathway risk from emissions of 
lead compounds, rather than developing a screening threshold emission 
rate, we compare maximum estimated chronic inhalation exposure 
concentrations to the level of the current National Ambient Air Quality 
Standard (NAAQS) for lead.\17\ Values below the level of the primary 
(health-based) lead NAAQS are considered to have a low potential for 
multipathway risk.
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    \17\ In doing so, the EPA notes that the legal standard for a 
primary NAAQS--that a standard is requisite to protect public health 
and provide an adequate margin of safety (CAA section 109(b))--
differs from the CAA section 112(f) standard (requiring, among other 
things, that the standard provide an ``ample margin of safety to 
protect public health''). However, the primary lead NAAQS is a 
reasonable measure of determining risk acceptability (i.e., the 
first step of the Benzene NESHAP analysis) since it is designed to 
protect the most susceptible group in the human population--
children, including children living near major lead emitting 
sources. 73 FR 67002/3; 73 FR 67000/3; 73 FR 67005/1. In addition, 
applying the level of the primary lead NAAQS at the risk 
acceptability step is conservative, since that primary lead NAAQS 
reflects an adequate margin of safety.
---------------------------------------------------------------------------

    For further information on the multipathway assessment approach, 
see the Residual Risk Assessment for the Integrated Iron and Steel 
Manufacturing Source Category in Support of the Risk and Technology 
Review 2019 Proposed Rule, available in the docket for this action.
5. How do we assess risks considering emissions control options?
    For point sources, as described in the ample margin of safety 
analysis section of this preamble, we assessed risks for a few possible 
control options to address risks due to emissions from some point 
sources for a few HAP that were driving the risks from point sources. 
For those few HAP and sources, we evaluated possible control 
technologies (such as activated carbon injection and wet electrostatic 
precipitators) and estimated the costs and the reduction in risks that 
would be achieved by those control technologies.
    For nonpoint emission sources, we estimated risks at an example 
facility before and after potential emission reductions that could be 
achieved by control options based on application of various work 
practices (see section IV.B of this preamble for further details). The 
analyses, control options, and estimated risks for the example facility 
before and after implementation of the potential work practices are 
described in section IV.B of this preamble and also in the technical 
memorandum titled Development of Emissions Estimates for Fugitive or 
Intermittent HAP Emission Sources for an Example Integrated Iron and 
Steel Manufacturing Facility for Input to the RTR Risk Assessment, 
available in the docket to this rule.
6. How do we conduct the environmental risk screening assessment?
a. Adverse Environmental Effect, Environmental HAP, and Ecological 
Benchmarks
    The EPA conducts a screening assessment to examine the potential 
for an adverse environmental effect as required under section 
112(f)(2)(A) of the CAA. Section 112(a)(7) of the CAA defines ``adverse 
environmental effect'' as ``any significant and widespread adverse 
effect, which may reasonably be anticipated, to wildlife, aquatic life, 
or other natural resources, including adverse impacts on populations of 
endangered or threatened species or significant degradation of 
environmental quality over broad areas.''
    The EPA focuses on eight HAP, which are referred to as 
``environmental HAP,'' in its screening assessment: Six PB-HAP and two 
acid gases. The PB-HAP included in the screening assessment are arsenic 
compounds, cadmium compounds, dioxins/furans, POM, mercury (both 
inorganic mercury and methyl mercury), and lead compounds. The acid 
gases included in the screening assessment are HCl and hydrogen 
fluoride (HF).
    HAP that persist and bioaccumulate are of particular environmental 
concern because they accumulate in the soil, sediment, and water. The 
acid gases, HCl and HF, are included due to their well-documented 
potential to cause direct damage to terrestrial plants. In the 
environmental risk screening assessment, we evaluate the following four 
exposure media: Terrestrial soils, surface water bodies (includes 
water-column and benthic sediments), fish consumed by wildlife, and 
air. Within these four exposure media, we evaluate nine ecological 
assessment endpoints, which are defined by the ecological entity and 
its attributes. For PB-HAP (other than lead), both community-level and 
population-level endpoints are included. For acid gases, the ecological 
assessment evaluated is terrestrial plant communities.
    An ecological benchmark represents a concentration of HAP that has 
been linked to a particular environmental effect level. For each 
environmental HAP, we identified the available ecological benchmarks 
for each assessment endpoint. We identified, where possible, ecological 
benchmarks at the following effect levels: Probable

[[Page 42715]]

effect levels, lowest-observed-adverse-effect level, and no-observed-
adverse-effect level. In cases where multiple effect levels were 
available for a particular PB-HAP and assessment endpoint, we use all 
of the available effect levels to help us to determine whether 
ecological risks exist and, if so, whether the risks could be 
considered significant and widespread.
    For further information on how the environmental risk screening 
assessment was conducted, including a discussion of the risk metrics 
used, how the environmental HAP were identified, and how the ecological 
benchmarks were selected, see Appendix 9 of the Residual Risk 
Assessment for the Integrated Iron and Steel Manufacturing Source 
Category in Support of the Risk and Technology Review 2019 Proposed 
Rule, available in the docket for this action.
b. Environmental Risk Screening Methodology
    For the environmental risk screening assessment, the EPA first 
determined whether any facilities in the Integrated Iron and Steel 
Manufacturing source category emitted any of the environmental HAP. For 
the Integrated Iron and Steel Manufacturing source category, we 
identified emissions of arsenic, cadmium, dioxins/furans, lead, POM (as 
PAH), mercury, and HCl. Because one or more of the environmental HAP 
evaluated are emitted by at least one facility in the source category, 
we proceeded to the second step of the evaluation.
c. PB-HAP Methodology
    The environmental screening assessment includes six PB-HAP, arsenic 
compounds, cadmium compounds, dioxins/furans, POM, mercury (both 
inorganic mercury and methyl mercury), and lead compounds. With the 
exception of lead, the environmental risk screening assessment for PB-
HAP consists of three tiers. The first tier of the environmental risk 
screening assessment uses the same health-protective conceptual model 
that is used for the Tier 1 human health screening assessment. 
TRIM.FaTE model simulations were used to back-calculate Tier 1 
screening threshold emission rates. The screening threshold emission 
rates represent the emission rate in tons of pollutant per year that 
results in media concentrations at the facility that equal the relevant 
ecological benchmark. To assess emissions from each facility in the 
category, the reported emission rate for each PB-HAP was compared to 
the Tier 1 screening threshold emission rate for that PB-HAP for each 
assessment endpoint and effect level. If emissions from a facility do 
not exceed the Tier 1 screening threshold emission rate, the facility 
``passes'' the screening assessment, and, therefore, is not evaluated 
further under the screening approach. If emissions from a facility 
exceed the Tier 1 screening threshold emission rate, we evaluate the 
facility further in Tier 2.
    In Tier 2 of the environmental screening assessment, the screening 
threshold emission rates are adjusted to account for local meteorology 
and the actual location of lakes in the vicinity of facilities that did 
not pass the Tier 1 screening assessment. For soils, we evaluate the 
average soil concentration for all soil parcels within a 7.5-km radius 
for each facility and PB-HAP. For the water, sediment, and fish tissue 
concentrations, the highest value for each facility for each pollutant 
is used. If emission concentrations from a facility do not exceed the 
Tier 2 screening threshold emission rate, the facility ``passes'' the 
screening assessment and typically is not evaluated further. If 
emissions from a facility exceed the Tier 2 screening threshold 
emission rate, we evaluate the facility further in Tier 3.
    As in the multipathway human health risk assessment, in Tier 3 of 
the environmental screening assessment, we examine the suitability of 
the lakes around the facilities to support life and remove those that 
are not suitable (e.g., lakes that have been filled in or are 
industrial ponds), adjust emissions for plume-rise, and conduct hour-
by-hour time-series assessments. If these Tier 3 adjustments to the 
screening threshold emission rates still indicate the potential for an 
adverse environmental effect (i.e., facility emission rate exceeds the 
screening threshold emission rate), we may elect to conduct a more 
refined assessment using more site-specific information. If, after 
additional refinement, the facility emission rate still exceeds the 
screening threshold emission rate, the facility may have the potential 
to cause an adverse environmental effect.
    To evaluate the potential for an adverse environmental effect from 
lead, we compared the average modeled air concentrations (from HEM-3) 
of lead around each facility in the source category to the level of the 
secondary NAAQS for lead. The secondary lead NAAQS is a reasonable 
means of evaluating environmental risk because it is set to provide 
substantial protection against adverse welfare effects which can 
include ``effects on soils, water, crops, vegetation, man-made 
materials, animals, wildlife, weather, visibility and climate, damage 
to and deterioration of property, and hazards to transportation, as 
well as effects on economic values and on personal comfort and well-
being.''
d. Acid Gas Environmental Risk Methodology
    The environmental screening assessment for acid gases evaluates the 
potential phytotoxicity and reduced productivity of plants due to 
chronic exposure to HF and HCl. The environmental risk screening 
methodology for acid gases is a single-tier screening assessment that 
compares modeled ambient air concentrations (from AERMOD) to the 
ecological benchmarks for each acid gas. To identify a potential 
adverse environmental effect (as defined in section 112(a)(7) of the 
CAA) from emissions of HF and HCl, we evaluate the following metrics: 
The size of the modeled area around each facility that exceeds the 
ecological benchmark for each acid gas, in acres and km\2\; the 
percentage of the modeled area around each facility that exceeds the 
ecological benchmark for each acid gas; and the area-weighted average 
SV around each facility (calculated by dividing the area-weighted 
average concentration over the 50-km modeling domain by the ecological 
benchmark for each acid gas). For further information on the 
environmental screening assessment approach, see Appendix 9 of the 
Residual Risk Assessment for the Integrated Iron and Steel 
Manufacturing Source Category in Support of the Risk and Technology 
Review 2019 Proposed Rule, available in the docket for this action.
7. How do we conduct facility-wide assessments?
    To put the source category risks in context, we typically examine 
the risks from the entire ``facility,'' where the facility includes all 
HAP-emitting operations within a contiguous area and under common 
control. In other words, we examine the HAP emissions not only from the 
source category emission points of interest, but also emissions of HAP 
from all other emission sources at the facility for which we have data.
    For this source category, we conducted the facility-wide assessment 
using a dataset compiled from the 2014 National Emissions Inventory 
(NEI). The source category records of that NEI dataset were removed, 
evaluated, and updated as described in section II.C of this preamble 
(``What data collection activities were conducted to support this 
action?''). Once a quality assured source category dataset was 
available, it

[[Page 42716]]

was placed back with the remaining records from the NEI for that 
facility. The facility-wide file was then used to analyze risks due to 
the inhalation of HAP that are emitted ``facility-wide'' for the 
populations residing within 50 km of each facility, consistent with the 
methods used for the source category analysis described above. For 
these facility-wide risk analyses, the modeled source category risks 
were compared to the facility-wide risks to determine the portion of 
the facility-wide risks that could be attributed to the source category 
addressed in this proposal. We also specifically examined the facility 
that was associated with the highest estimate of risk and determined 
the percentage of that risk attributable to the source category of 
interest. The document titled Residual Risk Assessment for the 
Integrated Iron and Steel Manufacturing Source Category in Support of 
the Risk and Technology Review 2019 Proposed Rule, available in the 
docket for this action, provides the methodology and results of the 
facility-wide analyses, including all facility-wide risks and the 
percentage of source category contribution to facility-wide risks.
8. How do we consider uncertainties in risk assessment?
    Uncertainty and the potential for bias are inherent in all risk 
assessments, including those performed for this proposal. Although 
uncertainty exists, we believe that our approach, which used 
conservative tools and assumptions, ensures that our decisions are 
health and environmentally protective. A brief discussion of the 
uncertainties in the RTR emissions dataset, dispersion modeling, 
inhalation exposure estimates, and dose-response relationships follows 
below. Also included are those uncertainties specific to our acute 
screening assessments, multipathway screening assessments, and our 
environmental risk screening assessments. A more thorough discussion of 
these uncertainties is included in the Residual Risk Assessment for the 
Integrated Iron and Steel Manufacturing Source Category in Support of 
the Risk and Technology Review 2019 Proposed Rule, available in the 
docket for this action. If a multipathway site-specific assessment was 
performed for this source category, a full discussion of the 
uncertainties associated with that assessment can be found in Appendix 
11 of that document titled Site-Specific Human Health Multipathway 
Residual Risk Assessment Report, available in the docket for this 
action.
a. Uncertainties in the RTR Emissions Datasets
    Although the development of the RTR emissions datasets involved 
quality assurance/quality control processes, the accuracy of emissions 
values will vary depending on the source of the data, the degree to 
which data are incomplete or missing, the degree to which assumptions 
made to complete the datasets are accurate, errors in emission 
estimates, and other factors. The emission estimates for point sources 
considered in this analysis generally are three-run averages and, 
therefore, do not reflect short-term fluctuations during the course of 
a year or variations from year to year. The estimates of peak hourly 
emission rates for the acute effects screening assessment were based on 
an emission adjustment factor applied to the estimated emission rates 
and are intended to account for emission fluctuations due to normal 
facility operations.
    The emissions from nonpoint sources were included in the risk 
assessment in an example facility analysis to assess the potential risk 
contributed by UFIP and the effect that omission of these sources from 
the source category could affect the estimate of risks for the source 
category as a whole. However, emission estimates for the nonpoint 
sources, in most cases, were based on available emission factors 
developed (many by the EPA) before 1980 and, in some cases, were 
developed from only a few facilities and included poor quality data as 
determined by the EPA's emission factor quality rating system (see 
https://www.epa.gov/air-emissions-factors-and-quantification/basic-information-air-emissions-factors-and-quantification), or originally 
were developed for other processes. In addition, the example facility 
had a higher arsenic-to-PM ratio for the BF in the ICR data compared to 
other facilities. Furthermore, the industry provided additional, more 
recent test data for the example facility that indicate arsenic 
emissions are likely lower than the level we had estimated based on the 
2011 ICR data that we used in our analysis.\18\ Therefore, we conclude 
our risk results are conservative (upper limit) estimates of the 
potential risks due to nonpoint sources and should be viewed more as a 
qualitative indication of potential upper end risks rather than a 
quantitative assessment of risk from nonpoint sources.
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    \18\ Paul Balserak, 2019. Letter and attachment from P. 
Balserak, American Iron and Steel Institute, Washington, DC, to C. 
French, U.S. EPA, Research Triangle Park, NC. 34 pages. February 4, 
2019.
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    The development of emissions estimates for the nonpoint sources at 
the example facility as well as emissions estimates considered but not 
used in this proposal are described in detail in the technical 
memorandum titled Development of Emissions Estimates for Fugitive or 
Intermittent HAP Emission Sources for an Example Integrated Iron and 
Steel Manufacturing Facility for Input to the RTR Risk Assessment, 
available in the docket for this action.
b. Uncertainties in Dispersion Modeling
    We recognize there is uncertainty in ambient concentration 
estimates associated with any model, including the EPA's recommended 
regulatory dispersion model, AERMOD. In using a model to estimate 
ambient pollutant concentrations, the user chooses certain options to 
apply. For RTR assessments, we select some model options that have the 
potential to overestimate ambient air concentrations (e.g., not 
including plume depletion or pollutant transformation). We select other 
model options that have the potential to underestimate ambient impacts 
(e.g., not including building downwash). Other options that we select 
have the potential to either under- or overestimate ambient levels 
(e.g., meteorology and receptor locations). On balance, considering the 
directional nature of the uncertainties commonly present in ambient 
concentrations estimated by dispersion models, the approach we apply in 
the RTR assessments should yield unbiased estimates of ambient HAP 
concentrations. We also note that the selection of meteorology dataset 
location could have an impact on the risk estimates. As we continue to 
update and expand our library of meteorological station data used in 
our risk assessments, we expect to reduce this variability.
c. Uncertainties in Inhalation Exposure Assessment
    Although every effort is made to identify all of the relevant 
facilities and emission points, as well as to develop accurate 
estimates of the annual emission rates for all relevant HAP, the 
uncertainties in our emission inventory likely dominate the 
uncertainties in the exposure assessment. Some uncertainties in our 
exposure assessment include human mobility, using the centroid of each 
census block, assuming lifetime exposure, and assuming only outdoor 
exposures. For most of these factors, there is neither an under nor 
overestimate when looking at the maximum individual risk or the 
incidence, but the shape of the distribution of risks may be affected.

[[Page 42717]]

With respect to outdoor exposures, actual exposures may not be as high 
if people spend time indoors, especially for very reactive pollutants 
or larger particles. For all factors, we reduce uncertainty when 
possible. For example, with respect to census-block centroids, we 
analyze large blocks using aerial imagery and adjust locations of the 
block centroids to better represent the population in the blocks. We 
also add additional receptor locations where the population of a block 
is not well represented by a single location.
d. Uncertainties in Dose-Response Relationships
    There are uncertainties inherent in the development of the dose-
response values used in our risk assessments for cancer effects from 
chronic exposures and noncancer effects from both chronic and acute 
exposures. Some uncertainties are generally expressed quantitatively, 
and others are generally expressed in qualitative terms. We note, as a 
preface to this discussion, a point on dose-response uncertainty that 
is stated in the EPA's 2005 Guidelines for Carcinogen Risk Assessment; 
namely, that ``the primary goal of EPA actions is protection of human 
health; accordingly, as an Agency policy, risk assessment procedures, 
including default options that are used in the absence of scientific 
data to the contrary, should be health protective'' (the EPA's 2005 
Guidelines for Carcinogen Risk Assessment, page 1-7). This is the 
approach followed here as summarized in the next paragraphs.
    Cancer UREs used in our risk assessments are those that have been 
developed to generally provide an upper bound estimate of risk.\19\ 
That is, they represent a ``plausible upper limit to the true value of 
a quantity'' (although this is usually not a true statistical 
confidence limit). In some circumstances, the true risk could be as low 
as zero; however, in other circumstances the risk could be greater.\20\ 
Chronic noncancer RfC and reference dose (RfD) values represent chronic 
exposure levels that are intended to be health-protective levels. To 
derive dose-response values that are intended to be ``without 
appreciable risk,'' the methodology relies upon an uncertainty factor 
(UF) approach,\21\ which considers uncertainty, variability, and gaps 
in the available data. The UFs are applied to derive dose-response 
values that are intended to protect against appreciable risk of 
deleterious effects.
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    \19\ IRIS glossary (https://ofmpub.epa.gov/sor_internet/registry/termreg/searchandretrieve/glossariesandkeywordlists/search.do?details=&glossaryName=IRIS%20Glossary).
    \20\ An exception to this is the URE for benzene, which is 
considered to cover a range of values, each end of which is 
considered to be equally plausible, and which is based on maximum 
likelihood estimates.
    \21\ See A Review of the Reference Dose and Reference 
Concentration Processes, U.S. EPA, December 2002, and Methods for 
Derivation of Inhalation Reference Concentrations and Application of 
Inhalation Dosimetry, U.S. EPA, 1994.
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    Many of the UFs used to account for variability and uncertainty in 
the development of acute dose-response values are quite similar to 
those developed for chronic durations. Additional adjustments are often 
applied to account for uncertainty in extrapolation from observations 
at one exposure duration (e.g., 4 hours) to derive an acute dose-
response value at another exposure duration (e.g., 1 hour). Not all 
acute dose-response values are developed for the same purpose, and care 
must be taken when interpreting the results of an acute assessment of 
human health effects relative to the dose-response value or values 
being exceeded. Where relevant to the estimated exposures, the lack of 
acute dose-response values at different levels of severity should be 
factored into the risk characterization as potential uncertainties.
    Uncertainty also exists in the selection of ecological benchmarks 
for the environmental risk screening assessment. We established a 
hierarchy of preferred benchmark sources to allow selection of 
benchmarks for each environmental HAP at each ecological assessment 
endpoint. We searched for benchmarks for three effect levels (i.e., no-
effects level, threshold-effect level, and probable effect level), but 
not all combinations of ecological assessment/environmental HAP had 
benchmarks for all three effect levels. Where multiple effect levels 
were available for a particular HAP and assessment endpoint, we used 
all of the available effect levels to help us determine whether risk 
exists and whether the risk could be considered significant and 
widespread.
    Although we make every effort to identify appropriate human health 
effect dose-response values for all pollutants emitted by the sources 
in this risk assessment, some HAP emitted by this source category are 
lacking dose-response assessments. Accordingly, these pollutants cannot 
be included in the quantitative risk assessment, which could result in 
quantitative estimates understating HAP risk. To help to alleviate this 
potential underestimate, where we conclude similarity with a HAP for 
which a dose-response value is available, we use that value as a 
surrogate for the assessment of the HAP for which no value is 
available. To the extent use of surrogates indicates appreciable risk, 
we may identify a need to increase priority for an IRIS assessment for 
that substance. We additionally note that, generally speaking, HAP of 
greatest concern due to environmental exposures and hazard are those 
for which dose-response assessments have been performed, reducing the 
likelihood of understating risk. Further, HAP not included in the 
quantitative assessment are assessed qualitatively and considered in 
the risk characterization that informs the risk management decisions, 
including consideration of HAP reductions achieved by various control 
options.
    For a group of compounds that are unspeciated (e.g., glycol 
ethers), we conservatively use the most protective dose-response value 
of an individual compound in that group to estimate risk. Similarly, 
for an individual compound in a group (e.g., ethylene glycol diethyl 
ether) that does not have a specified dose-response value, we also 
apply the most protective dose-response value from the other compounds 
in the group to estimate risk.
e. Uncertainties in Acute Inhalation Screening Assessments
    In addition to the uncertainties highlighted above, there are 
several factors specific to the acute exposure assessment that the EPA 
conducts as part of the risk review under section 112 of the CAA. The 
accuracy of an acute inhalation exposure assessment depends on the 
simultaneous occurrence of independent factors that may vary greatly, 
such as hourly emissions rates, meteorology, and the presence of a 
person. In the acute screening assessment that we conduct under the RTR 
program, we assume that peak emissions from the source category and 
reasonable worst-case air dispersion conditions (i.e., 99th percentile) 
co-occur. We then include the additional assumption that a person is 
located at this point at the same time. Together, these assumptions 
represent a reasonable worst-case actual exposure scenario. In most 
cases, it is unlikely that a person would be located at the point of 
maximum exposure during the time when peak emissions and reasonable 
worst-case air dispersion conditions occur simultaneously.

[[Page 42718]]

f. Uncertainties in the Multipathway and Environmental Risk Screening 
Assessments
    For each source category, we generally rely on site-specific levels 
of PB-HAP or environmental HAP emissions to determine whether a refined 
assessment of the impacts from multipathway exposures is necessary or 
whether it is necessary to perform an environmental screening 
assessment. This determination is based on the results of a three-
tiered screening assessment that relies on the outputs from models--
TRIM.FaTE and AERMOD--that estimate environmental pollutant 
concentrations and human exposures for five PB-HAP (chlorinated 
dibenzodioxins and furans, POM, mercury, cadmium, and arsenic) and two 
acid gases (HF and HCl). For lead, we use AERMOD to determine ambient 
air concentrations, which are then compared to the secondary NAAQS 
standard for lead. Two important types of uncertainty associated with 
the use of these models in RTR risk assessments and inherent to any 
assessment that relies on environmental modeling are model uncertainty 
and input uncertainty.\22\
---------------------------------------------------------------------------

    \22\ In the context of this discussion, the term ``uncertainty'' 
as it pertains to exposure and risk encompasses both variability in 
the range of expected inputs and screening results due to existing 
spatial, temporal, and other factors, as well as uncertainty in 
being able to accurately estimate the true result.
---------------------------------------------------------------------------

    Model uncertainty concerns whether the model adequately represents 
the actual processes (e.g., movement and accumulation) that might occur 
in the environment. For example, does the model adequately describe the 
movement of a pollutant through the soil? This type of uncertainty is 
difficult to quantify. However, based on feedback received from 
previous EPA SAB reviews and other reviews, we are confident that the 
models used in the screening assessments are appropriate and state-of-
the-art for the multipathway and environmental screening risk 
assessments conducted in support of RTR.
    Input uncertainty is concerned with how accurately the models have 
been configured and parameterized for the assessment at hand. For Tier 
1 of the multipathway and environmental screening assessments, we 
configured the models to avoid underestimating exposure and risk. This 
was accomplished by selecting upper-end values from nationally 
representative datasets for the more influential parameters in the 
environmental model, including selection and spatial configuration of 
the area of interest, lake location and size, meteorology, surface 
water, soil characteristics, and structure of the aquatic food web. We 
also assume an ingestion exposure scenario and values for human 
exposure factors that represent reasonable maximum exposures.
    In Tier 2 of the multipathway and environmental screening 
assessments, we refine the model inputs to account for meteorological 
patterns in the vicinity of the facility versus using upper-end 
national values, and we identify the actual location of lakes near the 
facility rather than the default lake location that we apply in Tier 1. 
By refining the screening approach in Tier 2 to account for local 
geographical and meteorological data, we decrease the likelihood that 
concentrations in environmental media are overestimated, thereby 
increasing the usefulness of the screening assessment. In Tier 3 of the 
screening assessments, we refine the model inputs again to account for 
hour-by-hour plume rise and the height of the mixing layer. We can also 
use those hour-by-hour meteorological data in a TRIM.FaTE run using the 
screening configuration corresponding to the lake location. These 
refinements produce a more accurate estimate of chemical concentrations 
in the media of interest, thereby reducing the uncertainty with those 
estimates. The assumptions and the associated uncertainties regarding 
the selected ingestion exposure scenario are the same for all three 
tiers.
    For the environmental screening assessment for acid gases, we 
employ a single-tiered approach. We use the modeled air concentrations 
and compare those with ecological benchmarks.
    For all tiers of the multipathway and environmental screening 
assessments, our approach to addressing model input uncertainty is 
generally cautious. We choose model inputs from the upper end of the 
range of possible values for the influential parameters used in the 
models, and we assume that the exposed individual exhibits ingestion 
behavior that would lead to a high total exposure. This approach 
reduces the likelihood of not identifying high risks for adverse 
impacts.
    Despite the uncertainties, when individual pollutants or facilities 
do not exceed screening threshold emission rates (i.e., screen out), we 
are confident that the potential for adverse multipathway impacts on 
human health is very low. On the other hand, when individual pollutants 
or facilities do exceed screening threshold emission rates, it does not 
mean that impacts are significant, only that we cannot rule out that 
possibility and that a refined assessment for the site might be 
necessary to obtain a more accurate risk characterization for the 
source category.
    The EPA evaluates the following HAP in the multipathway and/or 
environmental risk screening assessments, where applicable: Arsenic, 
cadmium, dioxins/furans, lead, mercury (both inorganic and methyl 
mercury), POM, HCl, and HF. These HAP represent pollutants that can 
cause adverse impacts either through direct exposure to HAP in the air 
or through exposure to HAP that are deposited from the air onto soils 
and surface waters and then through the environment into the food web. 
These HAP represent those HAP for which we can conduct a meaningful 
multipathway or environmental screening risk assessment. For other HAP 
not included in our screening assessments, the model has not been 
parameterized such that it can be used for that purpose. In some cases, 
depending on the HAP, we may not have appropriate multipathway models 
that allow us to predict the concentration of that pollutant. The EPA 
acknowledges that other HAP beyond these that we are evaluating may 
have the potential to cause adverse effects and, therefore, the EPA may 
evaluate other relevant HAP in the future, as modeling science and 
resources allow.

IV. Analytical Results and Proposed Decisions

A. What are the results of the risk assessment and analyses?

1. Chronic Inhalation Risk Assessment Results for Point Sources
    Table 2 of this preamble provides a summary of the results of the 
inhalation risk assessment for point source emissions for the source 
category. More detailed information on the risk assessment can be found 
in the document titled Residual Risk Assessment for the Integrated Iron 
and Steel Manufacturing Source Category in Support of the Risk and 
Technology Review 2019 Proposed Rule, available in the docket for this 
rule. Risks associated with sources of nonpoint emissions are discussed 
in a subsequent section below.

[[Page 42719]]



                          Table 2--Integrated Iron and Steel Manufacturing Inhalation Risk Assessment Results for Point Sources
--------------------------------------------------------------------------------------------------------------------------------------------------------
              Maximum individual  cancer   Population at increased   Annual cancer incidence     Maximum chronic  noncancer TOSHI      Maximum screening
                risk (in 1 million) \2\    risk of cancer >=1-in-1   (cases per year)  based              based on . . .              acute noncancer HQ
  Number of         based on . . .         million based on . . .           on . . .         ---------------------------------------- \3\ based on . . .
 facilities  --------------------------------------------------------------------------------
     \1\         Actual       Allowable      Actual     Allowable      Actual     Allowable    Actual  emissions       Allowable     -------------------
                emissions     emissions    emissions    emissions    emissions    emissions                            emissions       Actual  emissions
--------------------------------------------------------------------------------------------------------------------------------------------------------
         11            10            70       64,000    6,000,000         0.03          0.3                 0.1                 0.9       0.3 (arsenic)
                                                                                                (developmental)     (developmental)
--------------------------------------------------------------------------------------------------------------------------------------------------------
\1\ Number of facilities evaluated in the risk analysis.
\2\ Maximum individual excess lifetime cancer risk due to HAP emissions from the source category.
\3\ As REL. The maximum estimated acute exposure concentration was divided by available short-term dose-response values to develop an array of HQ
  values. HQ values shown use the lowest available acute dose-response value, which in most cases is the REL. When an HQ exceeds 1, we also show the HQ
  using the next lowest available acute dose-response value.

    Results of the inhalation risk assessment based on actual point 
source emissions indicate that the increased risk of cancer for the 
individual most exposed due to actual emissions could be as high as 10-
in-1 million, with chromium VI compound emissions from the BF process 
as the major contributor to the risk. The total estimated cancer 
incidence from point sources for this source category is 0.03 excess 
cancer cases per year, or one excess case about every 33 years. About 
64,000 people are estimated to have cancer risks at or above 1-in-1 
million from HAP emitted from the point sources in this source 
category, with 60 of those people estimated to have cancer risks 
greater than or equal to 10-in-1 million. The maximum chronic noncancer 
TOSHI due to the point sources in the source category could be up to 
0.1 (developmental) driven by emissions of arsenic and lead compounds 
from the oxygen furnace. No individual would have exposures resulting 
in a TOSHI ratio at or above 1. See the risk document referenced above 
for details of these analyses.
    Results of the inhalation risk assessment based on MACT-allowable 
point source emissions indicate that the cancer MIR could be as high as 
70-in-1 million with arsenic compounds, chromium VI compounds, nickel 
compounds, and cadmium compound emissions driving the risks. The 
maximum chronic noncancer TOSHI (developmental) could be as high as 0.9 
based upon the MACT-allowable emissions level, with arsenic compounds 
and lead compounds driving the TOSHI. The total estimated cancer 
incidence from the point sources in this source category considering 
allowable emissions is estimated to be about 0.3 excess cancer cases 
per year or 1 excess case about every 3 years. Based on allowable 
emission rates, approximately 6,000,000 people are estimated to have 
cancer risks at or above 1-in-1 million, with 80,000 of those people 
estimated to have cancer risks at or above 10-in-1 million. No 
individuals are estimated to have exposures that result in a noncancer 
HI at or above 1 at allowable emission rates.
2. Screening Level Acute Risk Assessment Results for Point Sources
    As shown in Table 2 of this preamble, the worst-case acute HQ 
(based on the REL) is 0.3, driven by emissions of arsenic from oxygen 
furnace and BF operations. This value is the highest HQ that is outside 
facility boundaries and is based on the assumption that hourly arsenic 
compound emissions from the BOPF and BF are 2 times the hourly 
emissions in the actual emissions. No facilities are estimated to have 
an HQ greater than or equal to 1 based on any benchmark (REL, AEGL, or 
EPRG). Acute risk estimates for each facility and pollutant are 
provided in the risk document referenced above.
3. Inhalation Risk Results for Nonpoint and Point Sources at an Example 
Facility
    After the EPA conducted the initial risk assessment for point 
sources only, a cursory comparison of those results with available 
ambient monitoring data at an example facility (U.S. Steel Gary Works 
located in Gary, Indiana) indicated that we may have underestimated the 
total facility emissions and that there may be other sources of 
category emissions not included in the point inventory. Furthermore, we 
obtained information from EPA Region V staff based on visual 
observations and ambient monitor measurements near some Integrated Iron 
and Steel Manufacturing facilities suggesting that there were sources 
of unmeasured fugitive and intermittent emissions (UFIP, or nonpoint 
emissions) that had not been included in the inventories yet nor 
included in any of the modeling runs. These emissions may account for 
the apparent initial underestimation of total facility emissions. 
Therefore, to address the apparent gap in emissions or sources, we 
investigated, evaluated, and estimated the potential emissions from 
nonpoint sources. These emissions are discussed in more detail below. 
The information and visual observations we obtained from Region V staff 
along with our assumptions and other details about the nonpoint sources 
and their emissions are discussed in the memorandum titled Development 
of Emissions Estimates for Fugitive or Intermittent HAP Emission 
Sources for an Example Integrated Iron and Steel Manufacturing Facility 
for Input to the RTR Risk Assessment, available in the docket for this 
proposed rule and summarized above.
    Based on the outcome of this investigation and evaluation, as 
described in section II.D above, the EPA estimated potential HAP 
emissions from seven nonpoint sources for the example facility to 
determine if the nonpoint sources could account for discrepancies in 
modeled versus monitored air concentrations. The example facility is 
the largest facility in the source category based on production 
capacity and also had the highest estimated HAP emissions from steel-
making sources (i.e., facility emissions not including sinter plant 
emissions). The seven nonpoint sources are: BF bleeder valve unplanned 
openings (also known as slips); BF bleeder valve planned openings; BF 
bell leaks; BF casthouse fugitives; BF iron beaching; BF slag handling 
and storage operations; and BOPF shop fugitives. The EPA developed a 
risk model input file for these seven nonpoint sources for this one 
large example facility. Next, we combined these emissions estimates 
with the point source emissions sources to create a risk model input 
file for the example facility with both point sources and nonpoint 
sources. Finally, the EPA conducted a risk assessment using upper-end 
emissions estimates to evaluate the potential exposures and risks due 
to all the emissions for this one example facility. Given the 
uncertainties regarding nonpoint source emissions, as described in 
section III.C.8 and further below, we expect that the risk results 
would over-predict the actual risks. The EPA primarily conducted this 
assessment to obtain a

[[Page 42720]]

qualitative understanding of the potential risks from nonpoint sources 
at the facilities.
    Based on the results of the EPA's inhalation risk analysis for the 
example facility, the estimated MIR for actual emissions increased from 
2-in-1 million (for point sources alone) to about 20-in-1 million when 
UFIP emissions are added to point sources emissions. The noncancer HI 
for actual emissions increased from 0.03 to 0.3 when the UFIP emissions 
were added to the estimated point source emissions for this facility. 
Acute noncancer HQ (based on the REL) increased from <1 to 3 (for 
comparison, the acute HI was not refined to the potential value at an 
offsite location) when UFIP emissions of arsenic were added to arsenic 
from point sources. Likewise, the affected population near the example 
facility with estimated cancer risks greater than or equal to 1-in-1 
million also increased when UFIP emissions were added, from 3,000 to 
4,000,000 people (with the upper value encompassing most of the city of 
Chicago because of the close proximity of Gary, Indiana). The estimated 
UFIP emissions affect a wider area than point sources with, 
consequently, a greater exposed population. The plumes associated with 
fugitive emissions are emitted at a relatively lower height than most 
point sources resulting in a higher ground-level concentration that 
takes longer to fall below levels of concern (such as 1-in-1 million 
risk levels). Thus, a larger population (including the city of Chicago) 
is estimated to be exposed to cancer risks greater than or equal to 1-
in-1 million from these low-level fugitive emissions based on the EPA's 
example facility risk assessment using upper-end emissions estimates.
    In the EPA's analysis, when UFIP emissions are added to point 
source emissions at the example facility, the MIR based on allowable 
emissions for UFIP and point sources increased from about 30-in-1 
million to about 50-in-1 million and the noncancer HI increased from 
0.3 to 0.7. The affected population with risk greater than or equal to 
10-in-1 million also increased when considering UFIP emissions. The 
overall results for the EPA's example facility risk assessment for 
actual and allowable emissions are presented in Table 3 of this 
preamble. For both actual and allowable emission scenarios, the 
increases in risk when considering the UFIP emissions primarily were a 
result of fugitive and intermittent HAP metal emissions from the BF 
casthouse and BOPF shop operations. Table 4 of this preamble presents 
the estimated percent contribution from each of the emissions sources 
to the total MIR for the example facility. Further details on the risk 
analysis for the UFIP emissions can be found in the document titled 
Residual Risk Assessment for the Integrated Iron and Steel 
Manufacturing Source Category in Support of the Risk and Technology 
Review 2019 Proposed Rule, available in the docket for this action.

                                        Table 3--Inhalation Risk Estimates for Point and Nonpoint Sources for an Example Facility Based on EPA's Analysis
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                           Inhalation chronic cancer risks                 Inhalation chronic noncancer risks         Acute noncancer risks
                                                              ----------------------------------------------------------------------------------------------------------------------------------
                                          Example facility                                                Population
              Emissions                       sources           MIR (in 1                 Population      with risks
                                                                 million)    Incidence  with risks  >1-    >10-in-1       Max HI            Target organ           Max HQ         Pollutant
                                                                                         in-1  million      million
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Actual..............................  Risks for Point Sources            2       0.010           3,000               0        0.03  Developmental..............         0.3  Arsenic.
                                       Only.
                                      Risks for Nonpoint                20        0.12       4,000,000           9,000         0.3  Developmental..............           3  Arsenic.
                                       Emissions & Point
                                       Sources.
Allowables..........................  Risks for Point Sources           30        0.13       4,000,000          11,000         0.3  Developmental..............
                                       Only.
                                      Risks for Nonpoint                50        0.24       4,000,000          90,000         0.7  Developmental..............
                                       Emissions & Point
                                       Sources.
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------


  Table 4--Estimated Percent Contribution to the MIR for All Emissions
     Sources at the Example Facility Based on EPA's Estimated Actual
                                Emissions
------------------------------------------------------------------------
  Estimated percent  contribution to the
       total MIR of 20-in-1 million               Emissions source
------------------------------------------------------------------------
50........................................  BF casthouse (fugitives).
21........................................  BOPF shop (fugitives).
9.........................................  BF bell leaks (fugitives).
8.........................................  All point sources combined.
5.........................................  BF planned openings
                                             (intermittent).
4.........................................  BF unplanned openings/Slips
                                             (intermittent).
2.........................................  BF slag handling
                                             (fugitives).
2.........................................  BF beaching (intermittent,
                                             fugitive).
100.......................................  Total.
------------------------------------------------------------------------

    As described in section III.C.8 above, there are uncertainties in 
the EPA's emissions estimates for the nonpoint sources used in the 
example facility risk analysis since the estimates are based on 
emission factors (some of which are relatively old) and many 
assumptions, especially where emission factors from other processes are 
used as estimates for UFIP sources. In addition, the example facility 
had a higher arsenic-to-PM ratio for the BF in the 2011 ICR data 
compared to other facilities. Subsequently, the American Iron and Steel 
Institute (AISI) provided additional, more recent test data for the 
example facility that suggest arsenic emissions are lower than the 
level we had estimated based on the 2011 ICR data that we used in our 
analysis (see Paul Balserak, 2019, citation in footnote 18). Therefore, 
we conclude the emissions used in our risk assessment are conservative 
(upper-end) estimates. This uncertainty also leads us to conclude that 
the risk results that include nonpoint sources are a qualitative 
indicator of the potential risk, rather than a true quantitative 
analysis, that may be higher than the actual risk due to assumptions 
about the level of emissions from nonpoint sources. These assumptions 
and uncertainties are explained in the memorandum titled Development of 
Emissions Estimates for Fugitive or Intermittent HAP Emission Sources 
for an Example Integrated Iron and Steel Manufacturing Facility for 
Input to the RTR Risk Assessment, available in the docket to this rule 
and summarized above.
    In addition to supplying new test data, the AISI also conducted 
their own risk analysis for the same example facility using the same 
input data (e.g., stack release parameters, fugitive source 
characteristics, latitude/longitude data for each emissions source, 
receptor information, etc.), the same model and following the same 
modeling analysis approach that the EPA used, except that

[[Page 42721]]

AISI used the newer 2018 test data instead of the 2011 ICR test data 
that the EPA used. The new test data and AISI risk results are 
described in the February 2019 AISI document (see Paul Balserak, 2019), 
which is available in the docket for this action.
    We did not have adequate time to complete an extensive review of 
the new test data, revise our model input files, and redo our risk 
analysis before proposal; therefore, we have not yet evaluated the full 
extent of how the new data will affect the overall results of the 
example facility risk assessment. Nevertheless, we expect that once we 
incorporate the new test data into our analyses and rerun our risk 
model, the risks will be lower than the risk estimates presented in 
Table 3 above. The results presented by AISI (which are presented in 
Table 5) indicate the MIR when the UFIP emissions are included could be 
about half the estimated value in the EPA's risk characterization 
presented above (i.e., 8-in-1 million compared to the EPA's estimate of 
20-in-1 million) and that population risks also could be substantially 
lower than those presented above in this preamble, with an estimated 
500,000 people with risks greater than or equal to 1-in-1 million 
compared to the estimate of 4,000,000 in the EPA's risk 
characterization.

       Table 5--Comparison of the Inhalation Risk Estimates for Point and Nonpoint Sources for Example Facility Based on the EPA and AISI Analyses
--------------------------------------------------------------------------------------------------------------------------------------------------------
                                                                                          Inhalation chronic cancer risks
                                                         -----------------------------------------------------------------------------------------------
                                                                MIR (in 1 million)         Population with risks >1-in-1  Population with risks  >10-in-
                                                         --------------------------------             million                        1 million
                        Emissions                                                        ---------------------------------------------------------------
                                                          Based on EPA's     Based on                        Based on                        Based on
                                                           risk analysis    AISI's risk   Based on EPA's    AISI's risk   Based on EPA's    AISI's risk
                                                                             analysis      risk analysis     analysis      risk analysis     analysis
--------------------------------------------------------------------------------------------------------------------------------------------------------
Actual..................................................              20               8       4,000,000         500,000           9,000               0
Allowables..............................................              50              20       4,000,000              NA          90,000              NA
--------------------------------------------------------------------------------------------------------------------------------------------------------
NA = Not available.

    Despite uncertainties in the individual nonpoint emission estimates 
and the range of estimated potential risks reflected in Table 5, 
monitor data near the example facility indicate that both the EPA and 
AISI analyses better predict levels of metal HAP (e.g., arsenic and 
lead) when nonpoint emissions are included. The comparisons of modeled 
results to ambient monitoring data are described in the EPA's technical 
memorandum titled Development of Emissions Estimates for Fugitive or 
Intermittent HAP Emission Sources for an Example Integrated Iron and 
Steel Manufacturing Facility for Input to the RTR Risk Assessment, and 
in the February 2019 AISI risk assessment document,\18\ both available 
in the docket for this proposed rule.
    In summary, comparing the EPA's risk model results for UFIP 
emissions plus point sources to the risk model results for point 
sources alone for the example facility, the MIR based on actual 
emissions from only point sources was approximately an order of 
magnitude lower than the MIR obtained when UFIP emissions were included 
(about 2-in-1 million compared to about 20-in-1 million). The AISI 
analysis indicates the MIR based on actual emissions from only point 
sources also was approximately an order of magnitude lower than the MIR 
obtained when UFIP emissions were included (about 0.7-in-1 million 
compared to about 8-in-1 million). A similar relationship is seen for 
noncancer HI in the EPA's analysis, with 0.03 HI for point sources only 
as compared to 0.3 HI for point sources plus UFIP emissions. As shown 
in Tables 3 and 5 of this preamble, population risks also increased 
significantly when including UFIP emissions with actual point source 
emissions. For both actual and allowable emission scenarios, the 
increase in estimated risk when including UFIP emissions was primarily 
a result of the fugitive HAP metal emissions from BF and BOPF 
operations. However, as described above, there are uncertainties in the 
UFIP emissions estimates. Further details on the EPA's risk analysis 
for the UFIP and other emissions can be found in the document titled 
Residual Risk Assessment for the Integrated Iron and Steel 
Manufacturing Source Category in Support of the Risk and Technology 
Review 2019 Proposed Rule, available in the docket for this action.
    It is important to note that we did not estimate the nonpoint 
emissions for any facilities other than the example facility in the 
source category. Therefore, we did not estimate the risks due to 
nonpoint emissions from those facilities. Because the fugitive 
emissions from UFIP sources were estimated from production-based 
emission factors, we made a reasonable assumption that the facility 
that produces the most product would be estimated to have the highest 
fugitive emissions; hence, the selection of the example facility to run 
the risk model for UFIP emissions because it has the highest production 
rate in the source category. Additionally, actual nonpoint emissions 
could be affected to some unknown extent by the quality of equipment 
and operational practices at each facility.
    Nevertheless, by evaluating the risk results from the example 
facility (for both nonpoint and point sources) along with the risk 
results for the point sources for all 11 facilities, it appears that 
the inclusion of nonpoint sources for risk assessment at all other 
facilities potentially could result in an MIR slightly greater than 70-
in-1 million based on allowable emissions, but less than 90-in-1 
million. We derived this upper bound worst-case potential risk by 
taking the MIR for another facility, which had the highest MIR based on 
point source allowable emissions among all 11 facilities (i.e., MIR of 
70-in-1 million from Table 2), and assumed that the risks due to 
nonpoint sources at this facility would be less than the 20-in-1 
million MIR we estimated for the example facility, because the other 
facility has much lower production rate compared to the example 
facility. Thus, we conclude that the estimated upper end MIR based on 
allowable emissions for the source category could be slightly more than 
70-in-1 million but less than 90-in-1 million. We are asking for 
comments on the potential risk from UFIP sources, as described above, 
and the impact that the potential additional risk could have on the 
risk for the source category and overall acceptability of the risk for 
the source category.

[[Page 42722]]

4. Multipathway Risk Screening Results
    Potential multipathway health risks under a fisher and gardener 
scenario were evaluated using a three-tier screening assessment of the 
PB-HAP emitted by point sources at facilities in this source category. 
All 11 facilities have reported emissions of carcinogenic PB-HAP 
(dioxins/furans, arsenic, and POM) and non-carcinogenic PB-HAP (cadmium 
and mercury) that exceed the Tier 1 SV of 1 for the fisher/farmer 
scenario. For facilities that exceeded a Tier 1 multipathway SV of 1, 
we used additional facility-specific information to perform an 
assessment through Tiers 2 and 3 and a site-specific analysis, as 
necessary, to determine the maximum chronic cancer and noncancer 
multipathway health risks for the source category. For cancer, the 
highest Tier 3 SV was 200 (arsenic and dioxins/furans), and there were 
seven facilities with Tier 3 SV greater than 1. For noncancer, the 
highest Tier 3 SV was 2 (mercury and cadmium), and there was one 
facility with Tier 3 SV greater than 1.
    An exceedance of a SV in any of the tiers cannot be equated with a 
risk value or an HQ (or HI). Rather, it represents a high-end estimate 
of what the risk or hazard may be. For example, a SV of 2 for a non-
carcinogen can be interpreted to mean that we are confident that the HQ 
would be lower than 2. Similarly, a SV of 200 for a carcinogen means 
that we are confident that the risk is lower than 200-in-1 million. Our 
confidence comes from the conservative, or health-protective, 
assumptions encompassed in the screening tiers: We choose inputs from 
the upper end of the range of possible values for the influential 
parameters used in the screening tiers; and we assume that the exposed 
individual exhibits ingestion behavior that would lead to a high total 
exposure.
    To further evaluate the potential multipathway risks, we conducted 
a site-specific analysis of three facilities that are located in close 
proximity to each other: ArcelorMittal-Indiana Harbor facility, U.S. 
Steel Gary Works, and ArcelorMittal-Burns Harbor. All three facilities 
also have sinter plants that emit dioxins/furans and are close to water 
bodies. These candidate sites also were selected because of their 
exceedances of the cancer SV, where arsenic and dioxins/furans under 
the fisher and gardener scenarios had the highest exceedances for the 
source category, and because of their exceedances of the tiered 
noncancer SV, where mercury and cadmium under the fisher scenario had 
the highest exceedances for the source category. We expect that the 
exposures we assessed are among the highest that might be encountered 
in this source category, based on combination of the magnitude of HAP 
emissions and the density of the population in the regions surrounding 
the facilities.
    The site-specific analysis for the fisher scenario resulted in an 
estimated maximum excess individual cancer risk of about 40-in-1 
million (due to dioxin/furan emissions from sinter plants) and the 
gardener (rural) scenario resulted in an estimated maximum excess 
individual cancer risk of about 20-in-1 million for arsenic and 
dioxins/furans. The site-specific multipathway assessment for the 
fisher scenario produced a noncancer HQ of 0.1 for cadmium and 0.5 for 
mercury. The protocol for developing the refined site-specific 
multipathway assessment, input data, assumptions, and detailed results 
are presented in the document titled Residual Risk Assessment for the 
Integrated Iron and Steel Manufacturing Source Category in Support of 
the Risk and Technology Review 2019 Proposed Rule, available in the 
docket for this action.
    In evaluating the potential for multipathway effects from emissions 
of lead, we compared modeled annual lead concentrations to the primary 
NAAQS for lead (0.15 [micro]g/m\3\). The highest annual lead 
concentration of 0.004 [micro]g/m\3\ is well below the NAAQS for lead, 
indicating a low potential for multipathway impacts of concern due to 
lead. Multipathway risks were not explicitly calculated with the 
additional estimated actual UFIP. However, based upon the increase in 
certain metal emissions (arsenic and mercury), we could expect these 
risks to increase as well, although not linearly with emission changes.
5. Environmental Risk Screening Results
    As described in section III.C of this document, we conducted an 
environmental risk screening assessment for the Integrated Iron and 
Steel Manufacturing source category for the following pollutants: 
Arsenic, cadmium, dioxins/furans, HCl, lead, mercury (methyl mercury 
and mercuric chloride), and POM.
    In the Tier 1 screening analysis for PB-HAP (other than lead, which 
was evaluated differently), arsenic emissions at two facilities had 
exceedances for the surface soil threshold level (plant communities) 
and the surface soil No Observed Adverse Effect Level (NOAEL) (avian 
ground insectivores) by a maximum SV of 4. Cadmium emissions at nine 
facilities had Tier 1 exceedances for the surface soil NOAEL (mammalian 
insectivores and avian ground insectivores), the fish NOAEL (avian 
piscivores and mammalian piscivores), the sediment community no-effect 
level, and the water-column community threshold level by a maximum SV 
of 50. Dioxins/furans emissions at three facilities had Tier 1 
exceedances for the surface soil NOAEL (mammalian insectivores) by a 
maximum SV of 600. Divalent mercury emissions at 11 facilities had Tier 
1 exceedances for the surface soil threshold level (invertebrate and 
plant communities) and the sediment threshold level by a maximum SV of 
60. Divalent mercury emissions, and subsequent methylation and 
formation of methyl mercury in biota, at the 11 facilities resulted in 
Tier 1 exceedances for the surface soil NOAEL (avian ground 
insectivores and mammalian insectivores) and the fish NOAEL (avian 
piscivores) by a maximum SV of 90. POM emissions at two facilities had 
Tier 1 exceedances for the sediment no-effect level by a maximum SV of 
5.
    A Tier 2 screening assessment was performed for arsenic, cadmium, 
dioxins/furans, divalent mercury, methyl mercury, and POM emissions. 
Arsenic, divalent mercury, and POM emissions had no Tier 2 exceedances 
for any ecological benchmark. Emissions from five facilities impact one 
lake (Chubb Lake), which caused an exceedance of the Tier 2 screen for 
the fish NOAEL (avian piscivores) by a maximum SV of 2 for both cadmium 
and divalent mercury. Dioxins/furans emissions from one facility 
exceeded the Tier 2 screen for the surface soil, NOAEL (mammalian 
insectivores) by a maximum SV of 4. This exceedance is based on the 
area-weighted average dioxins/furans concentration in the soils around 
this facility, for which 100 percent of the modeled soil area exceeded 
the Tier 2 screen. None of the other dioxin benchmarks evaluated were 
exceeded in the Tier 2 screen, including the NOAEL for common merganser 
and the NOAEL for mink.
    A site-specific assessment, incorporating plume rise and hour-by-
hour concentrations, was conducted for the dioxins/furans emissions 
from this facility. In the site-specific assessment, the area-weighted 
average dioxins/furans concentration in the soils around the facility 
did not exceed any benchmark. However, approximately 39 percent of the 
modeled soil area did exceed the NOAEL benchmark for mammalian 
insectivores (shrew) (exceedance areas had an area-weighted average 
exceedance of 3). However, none of the other 12 ecological benchmarks 
evaluated for dioxins/

[[Page 42723]]

furans showed any exceedances. This includes the following other NOAEL 
benchmarks: NOAEL for fish-eating birds (common merganser), NOAEL for 
fish-eating mammals (mink), and a lake benthic sediment no-effect 
level. Since the area-weighted-average dioxins/furans soil 
concentration did not exceed any benchmark and only one NOAEL of the 
three NOAELs evaluated showed any exceedance of a portion of the 
modeled area, we do not expect a significant and widespread adverse 
effect as a result of the dioxins/furans emissions from this source 
category. The analysis estimated no exceedances of the secondary lead 
NAAQS. For HCl, the average modeled concentration around each facility 
(i.e., the average concentration of all off-site data points in the 
modeling domain) did not exceed any ecological benchmark. In addition, 
each individual modeled concentration of HCl (i.e., each off-site data 
point in the modeling domain) was below the ecological benchmarks for 
all facilities.
    Based on the results of the environmental risk screening analysis, 
we do not expect an adverse environmental effect as a result of HAP 
emissions from this source category.
6. Facility-Wide Risk Results
    Based on facility-wide emissions of point sources and noncategory 
sources, the estimated cancer MIR is 80-in-1 million, mainly driven by 
emissions from coke ovens, which are from noncategory sources, i.e., 
not part of the Integrated Iron and Steel Manufacturing source 
category. The total estimated cancer incidence from the facility-wide 
analysis is 0.1 excess cancer cases per year, or one excess case every 
9 years. Approximately 1,800,000 people were estimated to have cancer 
risks at or above 1-in-1 million, and 67,000 of these people were 
estimated to have cancer risks at or above 10-in-1 million, from 
exposure to HAP emitted from both sources that are part of the 
Integrated Iron and Steel Manufacturing source category and sources 
that are not part of the source category at the 11 facilities in the 
source category. The maximum facility-wide TOSHI for the source 
category is estimated to be 0.8 (for the neurological HI) driven by 
emissions of manganese compounds from sources that are not part of the 
source category. Emissions of noncategory sources are described in the 
technical memorandum titled Integrated Iron and Steel Data Summary for 
Risk and Technology Review, available in the docket to this rule, that 
includes a description of all the emissions and process data used in 
this proposed rule along with any assumptions that were made.
7. What demographic groups might benefit from this regulation?
    To examine the potential for any environmental justice issues that 
might be associated with the source category, we performed a 
demographic analysis, which is an assessment of risks to individual 
demographic groups of the populations living within 5 km and within 50 
km of the facilities. In the analysis, we evaluated the distribution of 
HAP-related cancer and noncancer risks from the Integrated Iron and 
Steel Manufacturing source category point sources across different 
demographic groups within the populations living near facilities.\23\ 
Note that we did not do this type of analysis for the UFIP emissions 
because we only estimated UFIP emissions for one facility.
---------------------------------------------------------------------------

    \23\ Demographic groups included in the analysis are: White, 
African American, Native American, other races and multiracial, 
Hispanic or Latino, children 17 years of age and under, adults 18 to 
64 years of age, adults 65 years of age and over, adults without a 
high school diploma, people living below the poverty level, people 
living two times the poverty level, and linguistically isolated 
people.
---------------------------------------------------------------------------

    The results of the demographic analysis are summarized in Table 6 
below. These results, for various demographic groups, are based on the 
estimated risk from actual emissions from point sources for the 
population living within 50 km of the facilities.

               Table 6--Integrated Iron and Steel Manufacturing Demographic Risk Analysis Results
----------------------------------------------------------------------------------------------------------------
                                                                         Population with
                                                                      cancer risk at or at     Population with
                                                                         or above 1-in-1      chronic HI at or
                     Item                            Nationwide          million due to        above 1 due to
                                                                       integrated iron and   integrated iron and
                                                                       steel manufacturing   steel manufacturing
----------------------------------------------------------------------------------------------------------------
Total Population..............................           317,746,049                64,158                     0
----------------------------------------------------------------------------------------------------------------
                                          White and Minority by Percent
----------------------------------------------------------------------------------------------------------------
White.........................................                    62                    63                     0
Minority......................................                    38                    37                     0
----------------------------------------------------------------------------------------------------------------
                                               Minority by Percent
----------------------------------------------------------------------------------------------------------------
African American..............................                    12                    29                     0
Native American...............................                   0.8                   0.1                     0
Hispanic or Latino includes white and                             18                     4                     0
 nonwhite)....................................
Other and Multiracial.........................                     7                     4                     0
----------------------------------------------------------------------------------------------------------------
                                                Income by Percent
----------------------------------------------------------------------------------------------------------------
Below Poverty Level...........................                    14                    23                     0
Above Poverty Level...........................                    86                    77                     0
----------------------------------------------------------------------------------------------------------------
                                              Education by Percent
----------------------------------------------------------------------------------------------------------------
Over 25 and without High School Diploma.......                    14                    12                     0
Over 25 and with a High School Diploma........                    86                    88                     0
----------------------------------------------------------------------------------------------------------------

[[Page 42724]]

 
                                       Linguistically Isolated by Percent
----------------------------------------------------------------------------------------------------------------
Linguistically Isolated.......................                     6                   0.6                     0
----------------------------------------------------------------------------------------------------------------

    The results of the Integrated Iron and Steel Manufacturing source 
category demographic analysis indicate that point source emissions from 
the source category expose approximately 64,000 people to a cancer risk 
at or above 1-in-1 million and zero people to a chronic noncancer HI 
greater than or equal to 1. The percentages of the at-risk population 
in each demographic group (except for African American and Below 
Poverty Level) are similar to or lower than their respective nationwide 
percentages. The African American population exposed to a cancer risk 
at or above 1-in-1 million due to Integrated Iron and Steel 
Manufacturing emissions is more than three times the national average. 
Likewise, populations living ``Below Poverty Level'' exposed to cancer 
risk at or above 1-in-1 million is nearly twice the national average.
    The methodology and the results of the demographic analysis are 
presented in a technical report, Risk and Technology Review--Analysis 
of Demographic Factors for Populations Living Near Integrated Iron and 
Steel Manufacturing Facilities, available in the docket for this 
action.

B. What are our proposed decisions regarding risk acceptability, ample 
margin of safety, and adverse environmental effect?

    In this section, we discuss the results of our analysis of risk 
from point sources and our analysis of risk from point and nonpoint 
sources at the example facility. We also discuss our proposed finding 
of acceptability and our ample margin of safety analysis.
1. Risk Acceptability
    As noted in section II.A of this preamble, the EPA sets standards 
under CAA section 112(f)(2) using ``a two-step standard-setting 
approach, with an analytical first step to determine an `acceptable 
risk' that considers all health information, including risk estimation 
uncertainty, and includes a presumptive limit on MIR of approximately 
1-in-10 thousand.'' (54 FR 38045, September 14, 1989). In this 
proposal, the EPA estimated risks based on actual and allowable 
emissions from Integrated Iron and Steel Manufacturing sources, and we 
considered these in determining acceptability.
    The estimated inhalation cancer risk to the individual most exposed 
to actual emissions from the source category based on modeling point 
source emissions for all 11 facilities is 10-in-1 million. The 
estimated incidence of cancer due to inhalation exposures due to the 
point sources for the source category is 0.03 excess cancer cases per 
year, or one excess case every 33 years. We estimate that approximately 
64,000 people face an increased cancer risk greater than or equal to 1-
in-1 million due to inhalation exposure to HAP emissions from the point 
sources for this source category. The Agency estimates that the maximum 
chronic noncancer TOSHI from inhalation exposure due to point sources 
(only) for this source category is 0.1. The screening assessment of 
worst-case acute inhalation impacts due to point sources (only) 
indicates a maximum HQ of 0.3 (due to arsenic) based on the REL. With 
regard to multipathway human health risks, we estimate the cancer risk 
for the highest exposed individual is 40-in-1 million (due to dioxins/
furans emissions from sinter plants) and the maximum chronic HI is less 
than 1 for all the PB HAP. Although we did not assess multipathway risk 
for the example facility, the highest exposed individual for dioxins/
furans in the point source modeling was not due to the example facility 
and none of the nonpoint sources are expected to include dioxin/furans 
emissions.
    Based on allowable emissions, the estimated inhalation cancer risk 
to the individual most exposed from point sources for the source 
category would be 70-in-1 million and the estimated incidence of cancer 
due to inhalation exposures to these allowable emissions would be 0.3 
excess cancer cases per year, or one excess case every 3 years. An 
estimated 6 million people would face an increased cancer risk greater 
than or equal to 1-in-1 million due to inhalation exposure to allowable 
HAP emissions from this source category. The maximum chronic noncancer 
TOSHI from inhalation exposure would be 0.9 based on allowable 
emissions.
    With regard to the estimated risks due to actual emissions from 
nonpoint and point sources for the example facility, the estimated 
inhalation cancer risk to the individual most exposed to actual 
emissions for the example facility when nonpoint sources were included 
in the EPA's risk analysis increased from 2-in-1 million to 20-in-1 
million. The population exposed to risks greater than or equal to 1-in-
1 million increased from 3,000 to 4,000,000,\24\ and the population 
exposed to risks greater than or equal to 10-in-1 million increased 
from 0 to 9,000 due to increase in the estimated HAP emissions from 3 
tpy to 53 tpy. The maximum chronic noncancer TOSHI from inhalation 
exposures remained at less than 1, but the acute HQ increased from 0.3 
to 3 based on the REL (for arsenic). Based on allowable emissions, the 
estimated inhalation cancer risk to the individual most exposed 
increased from 30-in-1 million to 50-in-1 million with nonpoint 
sources. Thus, if nonpoint emissions were quantified for the entire 
source category, the source category risks presented in this section 
(based on point sources only) including the number of individuals with 
cancer risk exceeding 1-in-1 million would be expected to increase for 
each facility. Although it is problematic to estimate from the results 
presented here what the increase in risk might be for each facility in 
the entire industry without quantifying nonpoint emissions for each 
facility, based upon results from the example facility, we conclude 
that it is likely that the cancer and noncancer risks at other 
facilities would be less than 90-in-1 million and

[[Page 42725]]

the maximum chronic noncancer HI would be less than 1.
---------------------------------------------------------------------------

    \24\ The large affected population reflects the Greater Chicago 
area, which is in close proximity to the example facility. Metal HAP 
emissions at the example facility increased by a factor of 15 when 
UFIP emissions estimates were added to point source emissions; this 
increase is reflected in the estimated risk impacts for the example 
facility.
---------------------------------------------------------------------------

    In determining whether risks are acceptable for this source 
category, the EPA considered all available health information and risk 
estimation uncertainty as described above. The risk results indicate 
that the inhalation cancer risks to the individual most exposed may be 
more than 70-in-1-million but less than 90-in-1 million, as a worst 
case, considering the highest allowable risk due to point sources among 
the industry facilities plus the conservative estimate of risk from 
UFIP, which is less than the presumptive limit of acceptability of 100-
in-1 million,\25\ and also considering the uncertainties in the example 
facility analysis, as described above in section III.C.8.a. There are 
no facilities with an estimated maximum chronic noncancer HI greater 
than or equal to 1 from point sources. The maximum acute HQ for all 
pollutants is less than 1 when we only consider point source emissions, 
and up to 3 based on the REL for arsenic when including exposures to 
estimated emissions from nonpoint emissions at the example facility. 
For the acute screening analyses, to better characterize the potential 
health risks associated with estimated worst-case acute exposures to 
HAP, the EPA examines a wider range of available acute health metrics 
than is done for chronic risk assessments. This is in acknowledgement 
that there are generally more data gaps and uncertainties in acute 
reference values than there are in chronic reference values. By 
definition, the acute REL represents a health-protective level of 
exposure, with effects not anticipated below those levels, even for 
repeated exposures; however, the level of exposure that would cause 
health effects is not specifically known. As the exposure concentration 
increases above the acute REL, the potential for effects increases. In 
addition, the acute screening assessment includes the conservative 
(health protective) assumptions that every process releases its peak 
hourly emissions at the same hour, that the near worst-case dispersion 
conditions occur at that same hour, and that an individual is present 
at the location of maximum concentration for that hour. Further, the HQ 
value was not refined to an off-site location, which, in many cases, 
may be significantly lower than that estimated at an on-site receptor. 
Thus, because of the conservative nature of the acute inhalation 
screening assessment as well as the uncertainty in the nonpoint 
emission estimates, there is low probability that the maximum HQ of 3 
is associated with adverse health effects in the industry as a whole.
---------------------------------------------------------------------------

    \25\ See Benzene NESHAP (54 FR 38044, September 14, 1989) 
discussion above in section II.A of this proposal.
---------------------------------------------------------------------------

    Considering all of the health risk information and factors 
discussed above, including the uncertainties regarding our estimates of 
nonpoint emissions discussed in section III of this preamble, the EPA 
proposes that the risks are acceptable. The estimated cancer risks are 
below the presumptive limit of acceptability and the noncancer results 
indicate there is minimal likelihood of adverse noncancer health 
effects due to HAP emissions from this source category. We request 
comments on this proposed determination of acceptability.
2. Ample Margin of Safety Analysis and Potential Controls
    We next considered whether the existing MACT standards provide an 
ample margin of safety to protect public health. In the ample margin of 
safety analysis, we evaluated the cost and feasibility of available 
control technologies and other measures (such as work practices) that 
could be applied to the source category to further reduce the risks due 
to emissions of HAP. For purposes of the ample margin of safety 
analysis, after we evaluated these controls and measures and identified 
possible regulatory options based on this evaluation, we estimated the 
reductions in risks that would occur through adoption of these options 
for both actual and allowable emissions.
a. Point Sources
    The point sources at Integrated Iron and Steel Manufacturing 
facilities are already well controlled with baghouses and scrubbers. 
However, as part of the ample margin of safety assessment, we evaluated 
the following additional technologies for controlling point source 
emissions to further reduce risk from these sources, taking into 
consideration costs, energy, safety and other relevant factors. First, 
we evaluated the installation of a wet electrostatic precipitator (ESP) 
on the exhaust of the current air pollution control devices for the BF 
casthouse primary units to reduce chromium VI and arsenic emissions, 
respectively. We also evaluated the installation of activated carbon 
injection (ACI) systems onto current control devices for the sinter 
plant windbox to reduce emissions of dioxins/furans. Table 7 below 
shows the estimated costs, and emission and risk reductions with 
installation of these controls.

                    Table 7--Results of Ample Margin of Safety Analysis for Point Source Risk
----------------------------------------------------------------------------------------------------------------
                                                                    By HAP and Unit
                                      --------------------------------------------------------------------------
                                        Chromium VI (actuals)     Arsenic (allowable)         Dioxins/furans
                 Item                 --------------------------------------------------    (actuals, as TEQ)
                                                                                        ------------------------
                                                  BF                      BOPF                 Sinter plant
----------------------------------------------------------------------------------------------------------------
                                                 Industry Costs
----------------------------------------------------------------------------------------------------------------
Capital..............................  $476,538,529...........  $793,465,144...........  $781,286.
Annual...............................  $62,065,611............  $103,342,953...........  $1,849,781.
----------------------------------------------------------------------------------------------------------------
                                                Emissions Removed
----------------------------------------------------------------------------------------------------------------
                                       3.29E-02 tpy...........  2.25 tpy...............  1.97E-02 lb/yr.
----------------------------------------------------------------------------------------------------------------
                               Cost Effectiveness [Annual Costs/Emissions Removed]
----------------------------------------------------------------------------------------------------------------
Individual HAP.......................  $943,217/lb............  $22,918/lb.............  $94,006,541/lb.

[[Page 42726]]

 
                                       $1.9 trillion/ton......  $46 million/ton........  $188 trillion/ton.
----------------------------------------------------------------------------------------------------------------
                                                    Risk MIR
----------------------------------------------------------------------------------------------------------------
Before Control.......................  10.....................  70.....................  40.
After Control........................  <1.....................  4......................  <1.
----------------------------------------------------------------------------------------------------------------

    Although the MIR could be reduced from 10-in-1 million, 70-in-1 
million, and 40-in-1 million for BF chromium actual emissions, BOPF 
arsenic allowable emissions, and sinter plant dioxins/furans actual 
emissions as toxic equivalents (TEQ),\26\ respectively, we are not 
proposing any of these control scenarios because of the relatively high 
capital costs and annualized costs. These controls are not considered 
cost effective, where cost effectiveness estimates are determined to be 
$1.9 trillion/ton ($940,000/pound(lb)), $46 million/ton ($23,000/lb), 
and $188 trillion/ton ($94 million/lb) for BF chromium, BOPF arsenic, 
and sinter plant dioxins/furans, respectively. For details of this 
analysis, see the technical document titled Ample Margin of Safety for 
Point Sources in the II&S Industry, available in the docket to this 
rule, that describes the costs of additional control of BF chromium, 
BOPF arsenic, and sinter plant dioxin/furans.
---------------------------------------------------------------------------

    \26\ From the 2005 World Health Organization (WHO) toxicity 
equivalence factors. See Recommended Toxicity Equivalence Factors 
(TEFs) for Human Health Risk Assessments of 2,3,7,8-
Tetrachlorodibenzo-p-dioxin and Dioxin-Like Compounds. Publication 
No. EPA/100/R-10/005. U.S. EPA, Washington, DC. 2010.
---------------------------------------------------------------------------

b. Nonpoint Sources
    In addition to the control options assessed for point sources, we 
identified work practices that could achieve HAP reductions from the 
seven nonpoint sources, such as more frequent measurements (e.g., 
opacity, internal furnace conditions), increased maintenance, applying 
covers on equipment, developing operating plans to minimize emissions, 
optimizing positioning of ladles with respect to hood faces, and 
earlier repair of equipment. We evaluated work practices for these 
seven nonpoint sources, because the nature of these fugitive and 
intermittent emissions are such that they are not emitted through a 
conveyance designed and constructed to capture these pollutants. The 
work practices are described in more detail below. We request comments 
on these work practices and related information included below.
    As shown in Table 4 (above), the two nonpoint sources that present 
the highest contribution to the MIR are the BF casthouse and BOPF shop, 
which are currently regulated by opacity limits in the rule. These two 
nonpoint sources account for an estimated 71 percent of the 20-in-1-
million MIR at the example facility. The other five nonpoint sources 
(BF slag handling and storage, BF bell leaks, BF (bleeder valve) 
planned openings, BF (bleeder valve) unplanned openings, and BF iron 
beaching), when combined, account for about 22 percent of the 20-in-1-
million MIR at the example facility.
    We evaluated two main options to reduce emissions and risks under 
the ample margin of safety analysis under CAA section 112(f)(2). 
Although we are not proposing standards based on either option, we are 
requesting comments on the options. We ask for comments on the costs 
and effectiveness of the work practices to reduce emissions; whether 
these work practices should be viewed as viable methods to reduce 
emissions and, therefore, risk from these nonpoint sources; and whether 
further control of fugitive and/or intermittent emissions from these 
nonpoint sources by implementation of the work practices, pursuant to 
CAA section 112(h), should be required under the ample margin of safety 
analysis for this source category.
    Option 1 would be to establish work practice standards for two of 
the nonpoint sources (BF casthouse fugitives and BOPF shop fugitives), 
which pose the greatest contribution to the MIR. Potential work 
practices for each of these two fugitive sources include the following:
    Potential work practices for the BF casthouse fugitives:
     Keep runner covers in place at all times except when 
runner or cover is being repaired or removed for inspection purposes 
(2-hour repair or observation limit);
     Develop and operate according to a ``BF Casthouse 
Operating Plan'' to minimize fugitive emissions and detect openings and 
leaks;
     Measure opacity frequently during the tapping operation 
(e.g., during four taps per month) with all openings closed (except for 
roof monitor) using EPA Method Alt-082 (camera) or EPA Method 9; and
     Keep doors and other openings, except roof monitors, 
closed during all transfer operations to extent feasible and safe.
    Potential work practices for the BOPF shop fugitives:
     Develop and operate according to a ``BOPF Shop Operating 
Plan'' to minimize fugitive emissions and detect openings and leaks;
     BOPF Shop Operating Plan may include:
    [cir] List of all events that generate visible emissions (VE), 
including slopping, and steps company will take to reduce incidence 
rate;
    [cir] Minimize hot iron pour/charge rate (minutes);
    [cir] Schedule of regular inspections of BOPF shop structure for 
openings and leaks to the atmosphere;
    [cir] Optimize positioning of hot metal ladles with respect to hood 
face and furnace mouth;
    [cir] Optimize furnace tilt angle during charging;
    [cir] Keep all openings, except roof monitors, closed, especially 
during transfer, to extent feasible and safe;
    [cir] Use higher draft velocities to capture more fugitives at a 
given distance from hood, if possible; and
    [cir] Monitor opacity periodically (e.g., once per month) from all 
openings with EPA Method Alt-082 (camera) or with EPA Method 9.
    We estimate these work practices would achieve a range of 50- to 
90-percent reduction in fugitive emissions from these sources, based on 
EPA judgement as to the potential

[[Page 42727]]

effectiveness of the work practices. With regard to reductions in 
risks, we developed a model input file to reflect the estimated 
emissions reductions that would be achieved under the Option 1 scenario 
and performed a post-control modeling scenario to estimate risk 
reductions. For the post-control scenario, we assumed the work 
practices would achieve 70-percent reduction in emissions (the midpoint 
between 50 and 90 percent). Based on this modeling assessment, we 
estimate Option 1 would reduce the MIR from 20-in-1 million to about 
10-in-1 million for the example facility, the estimated population with 
risks greater than or equal to 1-in-1 million would decrease from 
4,000,000 to 1,500,000, and the estimated population with risks greater 
than or equal to 10-in-1 million would decrease from 9,000 to 800. In 
addition, the maximum acute HQ would decrease from 3 to 2. This option 
also would achieve reductions in PM at or below 2.5 micrometers 
(PM2.5). We request comments on these estimated reductions.
    We estimate the total capital costs of Option 1 for the source 
category would be about $1.4 million and annualized costs would be 
about $1.7 million per year, with a cost effectiveness value of 
approximately $10,000/ton HAP corresponding to an estimate of 173 tons 
of HAP reductions. This estimate is based on cost estimates for 
individual emission units that were projected to the entire industry 
based on the number of units of each type at each facility. For details 
on these cost estimates, see the technical memorandum titled Cost 
Estimates and Other Impacts for the Integrated Iron and Steel Risk and 
Technology Review, available in the docket to this proposed rule, that 
describes the costs estimated for implementation of work practices to 
control emissions from nonpoint sources, the estimated emission 
reductions of HAP (and PM) at nonpoint sources with implementation of 
the work practices, and the cost effectiveness of the work practices in 
terms of estimated cost per ton of HAP (and PM) removed. We request 
comments on these cost estimates.
    Option 2 would be to establish work practice standards for all 
seven of the nonpoint sources described above. Potential work practices 
for two of the seven sources, the BF casthouse and BOPF shop under 
Option 2, would be the same as described above for Option 1. Potential 
work practices for the other five out of seven nonpoint sources in 
Option 2 include the following:

BF slag handling and storage operations
     Limit opacity to 10 percent, as 3-minute average; and
     Use of fog spray systems over pit area, applying spray 
after each dump of slag and during all digging activities to extent 
feasible and safe.

BF bell leaks (defined as opacity 10 percent for 
45 seconds total)
     Limit opacity to 10 percent, as average of three 
consecutive observations made 15 seconds to 5 minutes apart at any 
location at the top of the furnace (i.e., small bell or inter-bell 
relief valve);
     Observe BF top for VE monthly to identify beginning of 
leaks; measure opacity if VE positive;
     Maintain metal seats of large and small bells to minimize 
wear on seals; and
     Repair/replace seals within 4 months if fail to meet 
limit.

BF planned openings
     Limit opacity to 10 percent, as 3-minute average;
     Develop and operate according to a ``Dirty Gas Bleeder 
Valve Opening Plan'' to meet opacity limit;
     Idling preparation activities:
    [cir] Tap as much liquid (iron and slag) out of furnace as 
possible;
    [cir] Remove fuel and/or stop fuel injection into furnace; and
    [cir] Establish and use lowest bottom pressure possible, according 
to EPA-specified procedures.

BF unplanned openings (``slips'')
     Limit four slips/month;
    [cir] If exceed this limit (5th slip, 1st exceedance), develop and 
operate according to a ``Slip Avoidance Plan'';
     Perform root cause analysis for 2nd and 3rd exceedance of 
monthly limit (6th and 7th slip); modify plan as appropriate and safe 
to decrease occurrence of slips; and
     At 4th exceedance of monthly limit (8th slip), install 
additional devices to continuously measure/monitor material levels in 
furnace (i.e., stockline), at a minimum of three locations, with alarms 
to inform operators of static (i.e., not moving) stockline conditions 
which increase the likelihood of slips. Also install/use instruments on 
furnace to monitor temperature and pressure to help determine when a 
slip has occurred. This information can help operators identify 
potential problems and, therefore, adjust controls/actions to avoid 
unplanned slips. These installations and monitoring would be required 
within 3 months of 8th slip.

BF iron beaching
     Limit opacity to 20 percent, as 6-minute averages 
continuously measured during entire beaching event;
     Minimize height, slope, and speed of beaching; and
     Use carbon dioxide shielding during beaching event; and/or 
use full or partial (hoods) enclosures around beached iron.

 Table 8--Estimated Costs, Reductions, and Cost-effectiveness of Control of Nonpoint Sources via Work Practices
                             in the Integrated Iron and Steel Manufacturing Industry
----------------------------------------------------------------------------------------------------------------
                                                                                                       Cost
                                                                                        HAP        effectiveness
                 Nonpoint source                   Capital costs   Annual costs     reductions       $/ton HAP
                                                                                      tpy \a\         removed
----------------------------------------------------------------------------------------------------------------
BF Unplanned Openings...........................      $1,200,000        $197,747             3.1         $63,962
BF Planned Openings.............................  ..............          59,205             2.0          29,605
BF Bell Leaks...................................       5,000,000         555,771             4.3         130,680
BF Casthouse Fugitives..........................         960,000       1,183,981              36          32,821
BOPF Shop Fugitives.............................         480,000         500,541             137           3,665
BF Iron Beaching................................  ..............          99,494           0.042       2,392,593
Slag Handling & Storage.........................       1,100,000         451,602             2.9         157,167
                                                 ---------------------------------------------------------------
    Overall Total...............................       8,740,000       3,048,342             185          16,478
----------------------------------------------------------------------------------------------------------------

    We estimate the total capital costs of Option 2 for the source 
category would be about $8.7 million and annualized costs would be 
about $3 million per year, for a cost effectiveness of $16,000/ton HAP 
corresponding to an estimate of

[[Page 42728]]

185 tons of HAP reductions. The estimated costs (capital and 
annualized), reductions, and cost effectiveness for the work practices 
for the seven individual UFIP sources are shown above in Table 8 and 
discussed in detail in the technical memorandum titled Ample Margin of 
Safety Analysis for Nonpoint Sources in the II&S Industry, available in 
the docket for this rule. We assume these work practices would achieve 
a range of 50- to 90-percent reduction in fugitive emissions.
    We request comments on these estimated reductions and cost 
estimates. There may be energy savings from reducing leaks of BF gas 
from bells, which is one of the work practices described above. We 
solicit comment on the potential energy and related cost savings for 
Integrated Iron and Steel Manufacturing facilities with implementation 
of this work practice.
    The cost methodology and cost estimates for control of emissions 
from the seven UFIP sources are described in detail in the technical 
memorandum titled Cost Estimates and Other Impacts for the Integrated 
Iron and Steel Risk and Technology Review, available in the docket to 
this rule. We request comments on these cost estimates.
    With regard to reductions in risks, we developed a risk model input 
file to reflect the estimated emissions reductions that would be 
achieved under Option 2 and performed a post-control analysis to 
estimate potential risk reductions. For the post-control scenario, we 
assumed the work practices would achieve 70-percent reduction in 
emissions (the midpoint between 50 and 90 percent). Based on this post-
control modeling assessment, we estimate Option 2 (i.e., work practices 
for all seven nonpoint sources) would reduce the MIR from 20-in-1 
million to about 9-in-1 million for example facility, the estimated 
population with risks greater than or equal to 1-in-1 million would 
decrease from 4,000,000 to 800,000, and the estimated population with 
risks greater than or equal to 10-in-1 million would decrease from 
9,000 to 0. Also, the maximum acute HQ would decrease from 3 to 0.9. 
This option would also achieve reductions in PM2.5.
    We note that there are uncertainties in our assessment and are 
requesting comments on this and any other issues that impact this 
assessment. First, as described above, there are uncertainties in the 
baseline UFIP emissions. Second, there are uncertainties in the 
estimated reductions that would be achieved by the work practices 
because we made assumptions regarding how much reduction would be 
achieved with the work practices. Third, there are uncertainties in the 
cost estimates because we made various assumptions about number of 
labor hours, equipment needed, and other known factors. There may be 
cost factors that are unknown to us at this time; we request comment on 
any additional cost impacts.
c. Ample Margin of Safety Decisions
    Based on consideration of all the information described above, 
including the risk results, costs, and uncertainties, we are proposing 
that no additional standards are necessary under section 112(f) of the 
CAA and that the current NESHAP provides an ample margin of safety. 
This decision is based largely on the cost and cost effectiveness of 
the point source controls and the uncertainties in the nonpoint source 
assessment in terms of baseline emissions, costs of the work practices, 
how much risk reduction they could achieve, and uncertainties regarding 
potential effects of the work practices on the facilities' operations, 
safety, and economics.
    We solicit comment on this proposed decision. We also solicit 
comments, as well as additional information and data, on the work 
practices and the two options described above. Specifically, we solicit 
comment on the emissions estimates, cost estimates, cost savings, 
estimated emissions reductions, control effectiveness, and any other 
relevant information regarding the value or appropriateness of 
incorporating work practices for UFIP sources into the NESHAP. We 
solicit comment on whether Option 1 or Option 2 should be required for 
these facilities, or some other combination of work practices. We also 
solicit comments, data, and information on the specific seven work 
practices, any issues they may present (e.g., safety, costs, 
disruptions of operations, etc.) and whether or not they should be 
included in the NESHAP and why.
    We also solicit comment on whether only opacity limits (similar to 
opacity limits currently in the NESHAP for the BF casthouse and BOPF 
shop fugitives) should be established for the other five UFIP (BF slag 
handling and storage, BF bell leaks, BF planned openings, BF unplanned 
openings, and BF iron beaching) without requiring any of the work 
practices described above. For example, we are seeking comments on 
whether it would be appropriate to establish opacity limits of 20 
percent for all five of these UFIP or a subset of these five UFIP 
sources. We also seek comments on whether it would be appropriate to 
establish opacity limits of 20 percent for BF bell leaks and BF bleeder 
valves (BF planned and unplanned openings) and 10 percent for BF iron 
beaching and BF slag handling and storage that would be consistent with 
requirements in some of the state implementation plans (SIP) for 
criteria pollutants that apply to some of the existing facilities. 
These opacity standards would ensure that these nonpoint sources in all 
states do not have opacity above the SIP levels. Details of the SIP 
requirements can be found in the technical memorandum titled Ample 
Margin of Safety for Nonpoint Sources in the II&S Industry, located in 
the docket for this rule and described above.
3. Adverse Environmental Effects
    Considering the results of our environmental risk screening, we do 
not expect an adverse environmental effect as a result of HAP emissions 
from this source category, and we are proposing that it is not 
necessary to set a more stringent standard to prevent an adverse 
environmental effect, taking into consideration costs, energy, safety, 
and other relevant factors.

C. What are the results and proposed decisions based on our technology 
review?

1. What are the results of our technology review for point sources?
    The emissions from point sources at Integrated Iron and Steel 
Manufacturing facilities are controlled by baghouses, ESPs, scrubbers, 
and fume/flame suppressants. For point sources, in addition to the 
controls considered for point sources under the ample margin of safety 
analysis above (in section IV.B), under the technology review, we 
evaluated the cost effectiveness of upgrading fume/flame suppressants 
used for control of fugitive PM and HAP metal emissions from BF to 
control of emissions with baghouses, and process modifications to 
further reduce dioxin/furan emissions from sinter plants. The 
technology reviews of these two emissions sources are discussed below 
and in detail in the technical memorandum titled Technology Review for 
the Integrated Iron and Steel NESHAP, available in the docket to this 
rule.
a. Upgrading Fume/flame Suppressants at Blast Furnaces to Baghouses
    Most emissions from the BF casthouse occur from tapping the molten 
iron (product) and slag (waste) to remove these materials from the 
furnace. Emissions occur at the taphole on the BF, from open troughs 
(runners) that transport the iron and slag, from open

[[Page 42729]]

ladles that receive the molten iron, and open iron transport systems 
(torpedo cars). These emissions are controlled in the Integrated Iron 
and Steel Manufacturing industry in one of two fundamentally different 
ways: fume and flame suppression techniques, or conventional 
ventilation practices that route exhaust air to control devices such as 
baghouses. Fume suppression consists of blowing natural gas over the 
open equipment which retards vaporization and prevents emissions. With 
flame suppression, the natural gas is ignited with accompanying oxygen 
consumption that suppresses the formation of metal oxide emissions. In 
more efficient control practices, local ventilation practices, such as 
localized hooding and other area ventilation techniques, are used to 
collect the emissions from the open BF equipment. Alternatively, the 
casthouse may be totally enclosed and evacuated to a control device. 
The use of fume/flame suppressants for control of fugitive BF casthouse 
emissions is estimated to have 75-percent control, whereas control with 
baghouses is estimated to have 95-percent control.
    There are a total of eight BF with fume/flame suppressants 
distributed at four facilities among the 21 BF total at 11 Integrated 
Iron and Steel Manufacturing facilities. Per-unit capital costs for 
converting from fume/flame suppressant control to baghouses are 
estimated to be $18 million with $2.7 million in annual unit costs, 
where some facilities have two or three units. Total industry costs are 
estimated to be $140 million in capital costs and $22 million annual 
costs. The estimated cost effectiveness of upgrading the fume/flame 
suppressant control to ventilation and baghouses at all eight BF is $7 
million/ton of metal HAP with 3 tons of HAP removed, and $160,000/ton 
PM with 120 tons of PM removed. We conclude these controls for PM and 
metal HAP emissions are not cost effective. Details of this cost 
estimate and other aspects of upgrading fume/flame suppressants to 
baghouses can be found in the technical memorandum cited above. We ask 
for comments and additional information regarding the estimated costs 
of these conversions, the underlying assumptions of our analysis, and 
our proposed conclusion that converting from the use of fume 
suppressant to installation of new baghouses for these sources would 
not be cost effective.
b. Process Modifications To Control Dioxins at Sinter Plants
    There are three facilities in the Integrated Iron and Steel 
Manufacturing source category that have sinter plants. The sinter 
plants are currently regulated by PM and opacity limits on the windbox 
exhaust stream, sinter cooler, and discharge end of sinter plant. In 
addition, the sinter plant windbox is regulated for organic HAP with 
compliance demonstrated by either meeting a VOC limit or a limit on oil 
content of the sinter feed. Dioxins/furans are components of the 
organic HAP but because of the high toxicity of this HAP, often are 
addressed separately under control scenarios. Therefore, our technology 
review included exploration of potential control measures that could 
further reduce dioxin/furans from sinter plants.
    We conducted a literature search and reviewed various technical 
publications (largely from Europe and other countries in the Stockholm 
Convention) \27\ regarding potential control technologies and practices 
to reduce dioxins from sinter plants and found a number of potential 
options that could potentially be applied at sinter plants in the 
U.S.28 29 30 These options include urea injection to inhibit 
dioxin formation; partial windbox exhaust gas recirculation; post-
exhaust windbox chemical spray (monoethanolamine and triethanolamine 
dissolved in water and sprayed onto exhaust); and elimination of 
certain inputs (e.g., no ESP dust). The European Union also included 
these measures in their 2013 Best Available Technology evaluation.\31\ 
As far as we know, none of these technologies or practices are 
currently used at sinter plants in the U.S. However, based on the 
literature cited above, we believe some of these technologies or 
measures may be used to control dioxins/furans in other countries (such 
as in Europe and other countries complying with the Stockholm 
Convention).\27\ Nevertheless, we have not been able to estimate the 
costs or effectiveness of these control methods due to lack of cost 
information in the literature, nor have we been able to estimate the 
feasibility for U.S. facilities. See the technical memorandum cited 
above for details on the technology review for dioxin/furans from 
sinter plants. We ask for comments on these potential process 
modifications and feasibility for control of dioxin/furans from sinter 
plants at U.S. Integrated Iron and Steel Manufacturing facilities.
---------------------------------------------------------------------------

    \27\ Stockholm Convention on Persistent Organic Pollutants 
(Pops), Texts and Annexes. Revised in 2017. Published by the 
Secretariat of the Stockholm Convention, Geneva, Switzerland. May 
2018. Available at: http://www.pops.int.
    \28\ Ooi, T. C. and L. Lu. Formation and mitigation of PCDD/Fs 
in iron ore sintering. Chemosphere 85 291-299. 2011.
    \29\ Boscolo, M, E., Padoano, and S. Tommasi. Identification of 
possible dioxin emission reduction strategies in preexisting iron 
ore sinter plants. Institute of Materials, Minerals and Mining. 
Published by Maney on behalf of the Institute. Ironmaking and 
Steelmaking. 15:35:11.The Charlesworth Group, Wakefield, UK. October 
19, 2007.
    \30\ Lanzerstorfer, C. State of the Art in Air Pollution Control 
for Sinter Plants. Chapter 18, in Ironmaking and Steelmaking 
Processes. P. Cavaliere, Ed. Springer International Publishing, 
Springer Nature, Switzerland AG. 2016.
    \31\ Best Available Techniques (BAT) Reference Document for Iron 
and Steel Production. Industrial Emissions Directive 2010/75/EU 
(Integrated Pollution Prevention and Control). R. Remus, M. A. 
Aguado-Monsonet. S. Roudier, L. D. Sancho. European Commission, 
Joint Research Centre, Institute for prospective technological 
studies. European IPPC Bureau, Seville, Spain. Luxembourg 
Publications Office of the European Union. doi:10.2791/97469. 2013.
---------------------------------------------------------------------------

c. Technology Review of Point Sources
    Considering all the information described above in our technology 
reviews, we have not identified any developments in practices, 
processes, or technologies that warrant revision of the NESHAP for 
point sources. Therefore, we are not proposing any changes to the 
NESHAP pursuant to section 112(d)(6) of the CAA for point sources.
    Other than the technologies and measures described above, we have 
not identified any additional potential developments in practices, 
processes, or technologies available to control emissions from point 
sources. Based on consideration of all the information described above, 
we are proposing that no additional standards are necessary under 
section 112(d)(6) of the CAA. We solicit comments on this proposed 
decision.
2. What are the results of our technology review for nonpoint sources?
    Fugitive emissions generated within the BF casthouse and BOPF shop 
from activities such as charging, tapping, and door openings for 
maintenance and process monitoring are partially controlled by 
secondary capture systems that route emissions captured by hoods and 
other collection systems to control devices that are either the primary 
control system or stand-alone secondary control devices. Because 
capture of fugitive emissions within the BF casthouse and BOPF shop is 
not always done or complete (i.e., not 100 percent) some uncaptured 
fugitive emissions escape through roof vents and other openings. To 
restrict the amount of fugitive emissions that escape the BF casthouse 
and BOPF shop, the NESHAP set opacity limits of 20 percent (3-minute 
average) for all openings at existing units to be measured a

[[Page 42730]]

minimum of once every 5 years (see 40 CFR 63.7821).\32\
---------------------------------------------------------------------------

    \32\ New BOPF sources have a 10-percent opacity limit, with one 
6-minute period greater than 10 percent but less than the 20 percent 
allowed each steel production cycle. For new BF, the opacity limit 
is 15 percent.
---------------------------------------------------------------------------

    In the analyses for nonpoint sources (described in sections II, 
III, and IV.B), we estimated the amount of fugitive PM and metal HAP 
potentially emitted from these two nonpoint sources, BF casthouses and 
BOPF shops. The occurrence of visible plumes of fugitives being emitted 
from these process structures has been observed during inspections and 
documented in reports and photographs by EPA Regional staff for years 
2008 to present.\2\ In the ample margin of safety analysis under Option 
1 described above (see section IV.B), we evaluated potential work 
practices to reduce uncaptured fugitive emissions from BF casthouses 
and BOPF shops; these sources contribute the highest risk of all UFIP 
sources. We also considered whether these work practices (described 
above under Option 1 in section IV.B to reduce fugitive emissions and 
associated risks from these sources) may constitute a development in 
work practices, processes, or technology to reduce fugitive emissions 
from BF casthouses and BOPF shops pursuant to section 112(d)(6) of the 
CAA that was not identified or considered during development of the 
original MACT standards. For more details of the technology review, see 
the technical memorandum titled Technology Review for the Integrated 
Iron and Steel NESHAP, available in the docket to this rule for details 
of the evaluation of work practices for control of fugitive HAP 
emissions from BF casthouses and BOPF shops. The estimated capital 
costs for work practices for these two nonpoint sources are $1.4 
million and annualized costs are $1.7 million. We estimate these work 
practices would achieve about 173 tpy reduction in metal HAP.
    Nevertheless, as described above, there are significant 
uncertainties in the baseline UFIP emissions, estimated reductions that 
would be achieved by the work practices, and costs. There are also 
uncertainties regarding the effect the work practices would have on 
facility operations, economics, and safety.
    After considering all the information described above, we propose 
to find that there are no developments in practices, processes, or 
control technologies that necessitate revising the standards for these 
two UFIP sources under CAA section 112(d)(6). This decision is based 
largely on the considerable uncertainties described above along with 
the cost issues.
    We ask for comments on our proposed decision, the costs and 
effectiveness of the work practices for the two UFIP sources, and 
whether these work practices should be viewed as a development in 
practices, processes, or technologies (pursuant to CAA section 
112(d)(6)) to reduce emissions at BF casthouses and BOPF shops, and 
whether further control of the above-mentioned fugitives from these 
processes by implementation of the work practices should be required 
under the technology review for this source category. These costs and 
reductions are described in detail in the technical memorandum titled 
Cost Estimates and Other Impacts for the Integrated Iron and Steel Risk 
and Technology Review, available in the docket to this rule, and 
discussed above.
    In summary, we propose to find that there are no cost-effective 
developments in practices, processes, or control technologies for these 
two UFIP sources. Therefore, we are not proposing any requirements 
under CAA section 112(d)(6) based on our technology review. However, we 
are soliciting comments on the potential of these work practices to 
reduce emissions from the two UFIP sources, as described above.

D. What actions are we taking pursuant to CAA sections 112(d)(2) and 
112(d)(3)?

    Separate from the RTR, in this action we are proposing standards 
for mercury emissions pursuant to CAA section 112(d)(2) and (3).\33\ 
The results of the analyses performed pursuant to CAA section 112(d)(2) 
and (3) and the standards proposed are presented below.
---------------------------------------------------------------------------

    \33\ The EPA has authority under CAA section 112(d)(2) and (3) 
to set MACT standards for previously unregulated emission points. 
The EPA also retains the discretion to revise a MACT standard under 
the authority of CAA section 112(d)(2) and (3) (see Portland Cement 
Ass'n v. EPA, 665 F.3d 177, 189 (D.C. Cir. 2011), such as when it 
identifies an error in the original standard. See also Medical Waste 
Institute v. EPA, 645 F. 3d 420, 426 (D.C. Cir. 2011) (upholding EPA 
action establishing MACT floors, based on post-compliance data, when 
originally-established floors were improperly established).
---------------------------------------------------------------------------

1. Background Regarding Mercury Emissions From the Source Category
    The current NESHAP for Integrated Iron and Steel Manufacturing does 
not include mercury emission standards. Based on data from the 2010 
ICR, we estimate the facilities in the source category emitted about 
1,000 lb/year of mercury in 2010. Based on the CAA section 114 test 
results, most (80 percent) of the mercury is from the BOPF and 
associated operations (i.e., HMTDS and ladle metallurgy). An 
examination of possible sources of mercury from the BOPF and associated 
operations revealed that the use of post-consumer steel scrap, as 
reported in the ICR, was the most likely source of mercury. Based on 
our understanding of the types of scrap and raw materials processed and 
the likely sources of mercury in various materials, we conclude that 
the predominant contributor to mercury emissions at integrated iron and 
steel facilities is the motor vehicle convenience switches that contain 
mercury (i.e., mercury switches) that are found in vehicles built 
before 2003 and end up in steel scrap. Therefore, it is reasonable to 
conclude that mercury emissions from Integrated Iron and Steel 
Manufacturing facilities predominantly result from steel scrap 
containing mercury switches fed into the BOPF. Details of the sources 
of mercury emissions can be found in the technical memorandum titled 
Mercury Emissions, Controls, and Costs at Integrated Iron and Steel 
Facilities, available in the docket to this rule, that describes the 
sources of mercury from Integrated Iron and Steel Manufacturing 
facilities and the issues and costs involved in control of mercury.
    However, based on models developed from analysis of the age of 
motor vehicles in the U.S. vehicle fleet, we estimate that mercury 
emissions from this source category are about 50 percent lower today as 
compared to 2010 and are expected to continue to decline over the 
coming years due to the 2003 U.S. motor vehicle mercury switch ban and 
the National Vehicle Mercury Switch Recovery Program (NVMSRP). For more 
information about the mercury emissions and predicted reductions see 
the technical memorandum titled Mercury Emissions, Controls, and Costs 
at Integrated Iron and Steel Facilities, available in the docket for 
this action.
    The NVMSRP is a cooperative effort established in 2006 among 
vehicle manufacturers, steel manufacturers, vehicle dismantlers, scrap 
shredders, the EPA, and other stakeholders, to support the removal of 
mercury switches from end-of-life vehicles. The NVMSRP involves more 
than 10,000 steel recyclers. The initial Memorandum of Understanding 
(MOU) between the NVMSRP parties was signed in 2006. On November 15, 
2018, the EPA signed a renewed MOU that extends the program through 
2021. Given its success, the EPA continues to support the NVMSRP that 
already has removed and safely recycled more than 6.8

[[Page 42731]]

million mercury switches containing a total of more than 7.6 tons of 
mercury. The MOU, renewed MOU, and other information regarding the 
NVMSRP are available at: https://www.epa.gov/smartsectors/mercury-switch-recovery-program, and in the docket for this rule.
2. Reconsideration Petition
    In 2004, the EPA received a petition for reconsideration from the 
Sierra Club, who referred to the EPA's statement in the Integrated Iron 
and Steel Manufacturing NESHAP that steel plants emit mercury but not 
in appreciable quantities. Sierra Club argued that the CAA does not 
allow the EPA not to set standards because emissions are insignificant. 
In 2005, the EPA granted reconsideration to evaluate a possible mercury 
standard. Consequently, the EPA is proposing in this action an 
emissions standard for mercury for the Integrated Iron and Steel 
Manufacturing source category pursuant to CAA section 112(d)(3).
3. Proposed MACT Standards for Mercury
    Section 302(k) of the CAA defines an emission standard as a 
requirement ``which limits the quantity, rate, or concentration of 
emissions of air pollutants on a continuous basis, including any 
requirement relating to the operation or maintenance of a source to 
assure continuous emission reduction, and any design, equipment, work 
practice or operational standard promulgated under this chapter.''
    Pursuant to CAA section 112(d)(3), we are proposing a MACT floor 
limit of 0.00026 lbs of mercury per ton of scrap processed as an input-
based limit for all existing BOPFs and existing integrated iron and 
steel manufacturing facilities. This limit was derived using ICR test 
data of the mass of mercury emissions from all BOPFs and related units 
(HMTDS and ladles) at each facility per mass of scrap used by each 
facility in their BOPFs with the assumption that the mass of mercury 
emitted from all BOPFs and related units is equivalent to the mass of 
mercury in the scrap input because mercury is neither created or 
destroyed in the BOPF. The mercury-to-scrap input ratios from the best 
performing five facilities out of all 11 integrated iron and steel 
manufacturing facilities in the Integrated Iron and Steel Manufacturing 
source category were used to develop an input-based MACT floor for 
mercury. We then determined an upper prediction limit (UPL) to develop 
the mercury standard that incorporates the potential variability in 
future measurements. Because there are fewer than 30 sources in the 
Integrated Iron and Steel Manufacturing source category, as described 
below, we evaluated the best performing five sources in the category, 
pursuant to CAA section 112(d)(3)(B).
    The EPA's MACT analyses use the UPL approach to identify the 
average emission limitation achieved by the best performing sources. 
The EPA uses this approach because it incorporates the average 
performance of the best performing sources as well as the variability 
of the performance during testing conditions. The UPL represents the 
value which one can expect the mean of a specified number of future 
observations (e.g., 3-run average) to fall below for the specified 
level of confidence (99 percent), based upon the results from the same 
population. In other words, the UPL estimates what the upper bound of 
future values will be based upon present or past background data. The 
UPL approach encompasses all the data point-to-data point variability 
in the collected data, as derived from the dataset to which it is 
applied. For more details regarding how this limit was derived, see the 
technical memorandum titled Mercury Emissions, Controls, and Costs at 
Integrated Iron and Steel Facilities, located in the docket for this 
rule, and described above.
    We are proposing that existing facilities would have two options to 
demonstrate compliance with the proposed input-based limit of 0.00026 
lbs of mercury per ton of scrap processed, as follows: (1) Conduct an 
annual emissions test at all BOPF-related units and convert the sum of 
the results to input-based units (i.e., lb of mercury per ton of scrap 
input) and document the results in a test report that can be submitted 
electronically to the delegated authority with the results (see section 
IV.E below); or (2) certify annually that the facility obtains all of 
their scrap from NVMSRP participants (or similar program as approved by 
the delegated authority) or establish that their scrap is not likely to 
contain mercury.
    Although we do not know exactly what type of scrap was used when 
the integrated iron and steel facilities performed the ICR testing for 
mercury,\34\ we assume the scrap was either NVMSRP scrap or scrap with 
higher amounts of mercury per ton of scrap than NVMSRP scrap. It is 
reasonable for the EPA to conclude that NVMSRP scrap in the future will 
contain similar levels of mercury or less mercury than the scrap used 
to develop the MACT floor limit, and this proposal relies on that 
conclusion. Therefore, if a facility opts to comply with the emission 
limit by certifying that all their scrap is from NVMSRP participants 
(or a similar approved program) or establishes that their scrap is not 
likely to contain mercury, it is also reasonable to conclude that the 
amount of mercury in the scrap achieves the same level of mercury 
reduction or more reduction as the numeric MACT floor limit.
---------------------------------------------------------------------------

    \34\ It is our understanding that there are at least three 
facilities in the Integrated Iron and Steel Manufacturing source 
category that obtain all their steel scrap from scrap providers that 
participate in the NVMSRP. (Personal communication (telephone).) P. 
Balserak, AISI, Washington, DC, with C. French, U. S. EPA, Research 
Triangle Park, North Carolina. December 13, 2018.). Also, during 
other discussions in 2018, industry representatives indicated they 
believed all, or most, facilities obtain all of their steel scrap 
from scrap providers that participate in the NVMSRP. However, we 
have not yet confirmed this information.
---------------------------------------------------------------------------

    Pursuant to CAA section 112(d)(3) requirements for new sources, the 
standard for new sources shall not be less stringent than the emission 
control that is achieved in practice by the best controlled similar 
source, we are proposing a new source MACT limit of 0.00008 lbs of 
mercury per ton of scrap processed as an input-based limit for any new 
BOPF and new integrated iron and steel manufacturing facility. A new 
BOPF and new integrated iron and steel manufacturing facility is 
defined to be any BOPF or facility constructed or reconstructed on or 
after August 16, 2019. This limit was derived using ICR test data of 
the mass of mercury emissions from all BOPF and related units (HMTDS 
and ladles) per mass of scrap used by the lowest-emitting facility. In 
addition, similar to existing sources above, we are proposing that new 
BOPF or new facilities would have two options to demonstrate compliance 
with the proposed input-based limit of 0.00008 lbs of mercury per ton 
of scrap processed, as follows: (1) Conduct an annual emissions test at 
all BOPF-related units and convert the sum of the results to input-
based units (i.e., lbs of mercury per ton of scrap input) and document 
the results in a test report that can be submitted electronically to 
the delegated authority with the results (see section IV.E below); or 
(2) certify annually that the facility obtains all of their scrap from 
NVMSRP participants (or similar program as approved by the delegated 
authority) or certify that their scrap is not likely to contain 
mercury.
    Following the same reasoning discussed above in connection with the 
existing source standard, although we do not know exactly what type of 
scrap was used when the integrated iron and steel facilities performed 
the ICR testing

[[Page 42732]]

for mercury, we assume the scrap was either NVMSRP scrap or scrap with 
higher amounts of mercury per ton of scrap than NVMSRP scrap. 
Therefore, it is reasonable for the EPA to conclude that scrap subject 
to the NVMSRP or other approved scrap program in the future will 
contain similar levels of mercury or less mercury than the scrap used 
to develop the MACT floor limit, and this proposal relies on that 
conclusion. We request comment on our proposed emissions standards for 
mercury at new and existing BOPF-related units.
    In terms of cost impacts, our analysis indicates that all 
facilities could meet the mercury limit in 2020 without any additional 
add-on controls. With declining mercury levels in vehicle scrap, we 
expect that all facilities that obtain all their scrap from suppliers 
who participate in the NVMSRP or similar approved program will meet 
this input-based standard without the need for any additional controls. 
For facilities that choose to comply by certifying they get all their 
scrap from NVMSRP participants, or a similar switch removal program, we 
estimate that the only costs to comply with this standard would be for 
recordkeeping and reporting, which we estimate at $1,058 per year per 
facility, and $11,639 per year for all 11 integrated iron and steel 
manufacturing facilities. If one or more facilities choose to conduct 
annual emissions tests, their costs would be higher due to the costs 
for the emissions tests. The costs to conduct an annual emissions test 
at all BOPF-related units, convert the sum of the results to input-
based units (i.e., lb of mercury per ton of scrap input), and document 
the results in a test report that can be submitted electronically to 
the delegated authority with the results is estimated to be 
approximately $151,000 per year per facility and $1,660,000 for the 
total industry.
    However, we assume all, or most, facilities will choose the option 
to comply by certifying scrap selection. We request comment on these 
compliance costs and also the assumption that purchasing scrap from 
NVMSRP scrap providers or a similar approved program results in a small 
additional cost to facilities. For more information regarding the 
derivation of the cost estimates for this proposed mercury standard and 
all aspects of mercury emissions and controls, see the document titled 
Mercury Emissions, Controls, and Costs at Integrated Iron and Steel 
Facilities, available in the docket to this rule.
4. Consideration of Beyond-the-Floor Options
    The EPA also evaluated possible beyond-the-floor options based on 
the addition of ACI with baghouses on BOPF and related units to further 
reduce emissions of mercury coming from their existing control devices 
(scrubbers, baghouses, and ESPs). We estimate the total capital costs 
for installing baghouse (if not already present) and ACI systems would 
be $24 million and annualized costs would be $38 million, and would 
achieve about 280 lbs mercury reduction per year for the first few 
years of compliance with such standards, based on the amount of mercury 
projected to be in the scrap in 2020 and considering the decrease in 
mercury expected in motor vehicle scrap. This results in estimated cost 
effectiveness of $136,000 per lb of mercury reductions. However, under 
this option, the amount of emissions and associated reductions would 
decrease over time as a result of the expected decline in mercury input 
due to the 2003 ban on mercury switches and aging of the vehicle fleet. 
Therefore, the beyond-the-floor controls would become less cost 
effective over time. For this reason, and because of the relatively 
high capital and annualized cost of ACI with baghouses, and poor cost 
effectiveness, the EPA is not proposing a beyond-the-floor option based 
on ACI with baghouses. See the document titled Mercury Emissions, 
Controls, and Costs at Integrated Iron and Steel Facilities, available 
in the docket to this rule, for details regarding the derivation of the 
cost and emission estimates for the beyond-the-floor option.
5. New Terms and Definitions
    With the addition of proposed MACT standards for mercury and to 
clarify a few other aspects of the NESHAP, we are proposing to add new 
terms along with their definitions. We ask for comment on the clarity 
of these definitions.
     Basic oxygen process furnace group means the collection of 
BOPF shop steelmaking operation units including the BOPF primary units 
(BOPF emissions from oxygen blow iron refining), BOPF secondary units 
(secondary fugitive emissions in the shop from iron charging, tapping, 
and auxiliary processes not elsewhere controlled), ladle metallurgy 
units, and hot metal transfer, desulfurization, and slag skimming 
units;
     Deviation for an affected source subject to this subpart, 
or an owner or operator of such a source, also includes failure to meet 
any requirement or obligation established by this rule, including, but 
not limited to, any emission limitation (including operating limits), 
standard, or operation and maintenance requirement;
     Mercury switch means a mercury-containing capsule or 
switch assembly that is part of a convenience light switch mechanism 
installed in a motor vehicle;
     Motor vehicle means an automotive vehicle not operated on 
rails and usually operated with rubber tires for use on highways;
     Motor vehicle scrap means post-consumer scrap from 
discarded vehicles or automobile bodies, including automobile body 
hulks that have been processed through a shredder. Motor vehicle scrap 
does not include automobile manufacturing bundles or miscellaneous 
vehicle parts, such as wheels, bumpers, or other components that do not 
contain mercury switches. Motor vehicle scrap typically is not sold 
separately but is combined with other steel scrap for sale;
     Opening means any roof monitor, vent, door, window, hole, 
crack, or other conduit that allows gas to escape to the atmosphere 
from a BF casthouse or BOPF shop;
     Post-consumer steel scrap means steel scrap that is 
composed of materials made of steel that were purchased by households 
or by commercial, industrial, and institutional facilities in their 
role as end-users of the product and which can no longer be used for 
its intended purpose;
     Pre-consumer steel scrap means steel scrap that is left 
over from industrial or manufacturing processes and which is 
subsequently recycled as scrap. Other terms used to describe this scrap 
are new, home, run-around, prompt-industrial, and return scrap;
     Scrap provider means the company or person (including a 
broker) who contracts directly with a steel mill to provide steel 
scrap. Scrap processors such as shredder operators or vehicle 
dismantlers that do not sell scrap directly to a steel mill are not 
scrap providers; and
     Steel scrap means pre-consumer and post-consumer discarded 
steel that is processed by scrap providers for resale (post-consumer) 
or used on-site (pre-consumer or run-around scrap from within a 
facility or company). Post-consumer steel scrap may or may not contain 
motor vehicle scrap, depending on the type of scrap. In regard to motor 
vehicle scrap, steel scrap only can be classified as ``scrap that is 
likely to contain motor vehicle scrap'' vs. ``scrap that is not likely 
to contain motor vehicle scrap,'' as determined by the scrap provider.

[[Page 42733]]

E. What other actions are we proposing?

    In addition to the proposed actions described above, we are 
proposing additional revisions to the NESHAP. We are proposing 
revisions to the SSM provisions of the MACT rule in order to ensure 
that they are consistent with the Court decision in Sierra Club v. EPA, 
551 F. 3d 1019 (D.C. Cir. 2008), which vacated two provisions that 
exempted sources from the requirement to comply with otherwise 
applicable CAA section 112(d) emission standards during periods of SSM. 
We also are proposing various other changes to modify reporting and 
monitoring. Our analyses and proposed changes related to these issues 
are discussed below.
1. SSM
    In its 2008 decision in Sierra Club v. EPA, 551 F.3d 1019 (D.C. 
Cir. 2008), the Court vacated portions of two provisions in the EPA's 
CAA section 112 regulations governing the emissions of HAP during 
periods of SSM. Specifically, the Court vacated the SSM exemption 
contained in 40 CFR 63.6(f)(1) and 40 CFR 63.6(h)(1), holding that 
under section 302(k) of the CAA, CAA section 112 emissions standards or 
limitations must be continuous in nature and that the SSM exemption 
violates the CAA's requirement that some CAA section 112 standards 
apply continuously.
    We are proposing the elimination of the SSM exemption in this rule 
which appears at 40 CFR 63.7810(a) and Table 4. Consistent with Sierra 
Club v. EPA, we are proposing standards in this rule that apply at all 
times. We are also proposing several revisions to Table 4 (the General 
Provisions Applicability Table) as is explained in more detail below. 
For example, we are proposing to eliminate the incorporation of the 
General Provisions' requirement that the source develop an SSM plan. We 
also are proposing to eliminate and revise certain recordkeeping and 
reporting requirements related to the SSM exemption as further 
described below.
    The EPA has attempted to ensure that the provisions we are 
proposing to eliminate are inappropriate, unnecessary, or redundant in 
the absence of the SSM exemption. We are specifically seeking comment 
on whether we have successfully done so.
    In proposing the standards in this rule, the EPA has taken into 
account startup and shutdown periods and, for the reasons explained 
below, has not proposed alternate standards for those periods. The 
integrated iron and steel manufacturing industry has not identified 
(and there are no data indicating) any specific problems with removing 
the SSM provisions. However, we solicit comment on whether any 
situations exist where separate standards, such as work practices, 
would be more appropriate during periods of startup and shutdown rather 
than the current standard.
    Periods of startup, normal operations, and shutdown are all 
predictable and routine aspects of a source's operations. Malfunctions, 
in contrast, are neither predictable nor routine. Instead they are, by 
definition, sudden infrequent and not reasonably preventable failures 
of emissions control, process, or monitoring equipment. (40 CFR 63.2) 
(definition of malfunction). The EPA interprets CAA section 112 as not 
requiring emissions that occur during periods of malfunction to be 
factored into development of CAA section 112 standards and this reading 
has been upheld as reasonable by the Court in U.S. Sugar Corp. v. EPA, 
830 F.3d 579, 606-610 (2016). Under CAA section 112, emissions 
standards for new sources must be no less stringent than the level 
``achieved'' by the best controlled similar source and for existing 
sources generally must be no less stringent than the average emission 
limitation ``achieved'' by the best performing 12 percent of sources in 
the category. There is nothing in CAA section 112 that directs the 
Agency to consider malfunctions in determining the level ``achieved'' 
by the best performing sources when setting emission standards. As the 
Court has recognized, the phrase ``average emissions limitation 
achieved by the best performing 12 percent of'' sources ``says nothing 
about how the performance of the best units is to be calculated.'' 
Nat'l Ass'n of Clean Water Agencies v. EPA, 734 F.3d 1115, 1141 (D.C. 
Cir. 2013). While the EPA accounts for variability in setting emissions 
standards, nothing in CAA section 112 requires the Agency to consider 
malfunctions as part of that analysis. The EPA is not required to treat 
a malfunction in the same manner as the type of variation in 
performance that occurs during routine operations of a source. A 
malfunction is a failure of the source to perform in a ``normal or 
usual manner'' and no statutory language compels the EPA to consider 
such events in setting CAA section 112 standards.
    As the Court recognized in U.S. Sugar Corp., accounting for 
malfunctions in setting standards would be difficult, if not 
impossible, given the myriad different types of malfunctions that can 
occur across all sources in the category and given the difficulties 
associated with predicting or accounting for the frequency, degree, and 
duration of various malfunctions that might occur. Id. at 608 (``the 
EPA would have to conceive of a standard that could apply equally to 
the wide range of possible boiler malfunctions, ranging from an 
explosion to minor mechanical defects. Any possible standard is likely 
to be hopelessly generic to govern such a wide array of 
circumstances.''). As such, the performance of units that are 
malfunctioning is not ``reasonably'' foreseeable. See, e.g., Sierra 
Club v. EPA, 167 F.3d 658, 662 (D.C. Cir. 1999) (``The EPA typically 
has wide latitude in determining the extent of data-gathering necessary 
to solve a problem. We generally defer to an agency's decision to 
proceed on the basis of imperfect scientific information, rather than 
to `invest the resources to conduct the perfect study.' '') See also, 
Weyerhaeuser v. Costle, 590 F.2d 1011, 1058 (D.C. Cir. 1978) (``In the 
nature of things, no general limit, individual permit, or even any 
upset provision can anticipate all upset situations. After a certain 
point, the transgression of regulatory limits caused by `uncontrollable 
acts of third parties', such as strikes, sabotage, operator 
intoxication or insanity, and a variety of other eventualities, must be 
a matter for the administrative exercise of case-by-case enforcement 
discretion, not for specification in advance by regulation.''). In 
addition, emissions during a malfunction event can be significantly 
higher than emissions at any other time of source operation. For 
example, if an air pollution control device with 99-percent removal 
goes off-line as a result of a malfunction (as might happen if, for 
example, the bags in a baghouse catch fire) and the emission unit is a 
steady state type unit that would take days to shut down, the source 
would go from 99-percent control to zero control until the control 
device was repaired. The source's emissions during the malfunction 
would be 100 times higher than during normal operations. As such, the 
emissions over a 4-day malfunction period would exceed the annual 
emissions of the source during normal operations. As this example 
illustrates, accounting for malfunctions could lead to standards that 
are not reflective of (and significantly less stringent than) levels 
that are achieved by a well-performing non-malfunctioning source. It is 
reasonable to interpret CAA section 112 to avoid such a result. The 
EPA's approach to malfunctions is consistent with CAA section 112 and 
is a reasonable interpretation of the statute.

[[Page 42734]]

    Although no statutory language compels the EPA to set standards for 
malfunctions, the EPA has the discretion to do so where feasible. For 
example, when the EPA conducted the Petroleum Refinery Sector RTR, the 
EPA established a work practice standard for unique types of 
malfunctions that result in releases from pressure relief devices or 
emergency flaring events because the EPA had information to determine 
that such work practices reflected the level of control that applies to 
the best performers. 80 FR 75178, 75211-14 (December. 1, 2015). The EPA 
will consider whether circumstances warrant setting standards for a 
particular type of malfunction and, if so, whether the EPA has 
sufficient information to identify the relevant best performing sources 
and establish a standard for such malfunctions. We also encourage 
commenters to provide any such information.
    In the event that a source fails to comply with the applicable CAA 
section 112(d) standards as a result of a malfunction event, the EPA 
would determine an appropriate response based on, among other things, 
the good faith efforts of the source to minimize emissions during 
malfunction periods, including preventative and corrective actions, as 
well as root cause analyses to ascertain and rectify excess emissions. 
The EPA would also consider whether the source's failure to comply with 
the CAA section 112(d) standard was, in fact, sudden, infrequent, not 
reasonably preventable, and was not instead caused in part by poor 
maintenance or careless operation. 40 CFR 63.2 (definition of 
malfunction).
    If the EPA determines in a particular case that an enforcement 
action against a source for violation of an emission standard is 
warranted, the source can raise any and all defenses in that 
enforcement action and the Federal district court will determine what, 
if any, relief is appropriate. The same is true for citizen enforcement 
actions. Similarly, the presiding officer in an administrative 
proceeding can consider any defense raised and determine whether 
administrative penalties are appropriate.
    In summary, the EPA interpretation of the CAA and, in particular, 
CAA section 112 is reasonable and encourages practices that will avoid 
malfunctions. Administrative and judicial procedures for addressing 
exceedances of the standards fully recognize that violations may occur 
despite good faith efforts to comply and can accommodate those 
situations. U.S. Sugar Corp. v. EPA, 830 F.3d 579, 606-610 (2016).
a. 40 CFR 63.7810(c) General Duty
    We are proposing to revise the General Provisions table (Table 4) 
by adding an entry for 40 CFR 63.6(e)(1)(i) and including a ``no'' in 
column 3. Section 63.6(e)(1)(i) describes the general duty to minimize 
emissions. Some of the language in that section is no longer necessary 
or appropriate in light of the elimination of the SSM exemption. We are 
proposing instead to add general duty regulatory text at 40 CFR 
63.7810(c) that reflects the general duty to minimize emissions while 
eliminating the reference to periods covered by an SSM exemption. The 
current language in 40 CFR 63.6(e)(1)(i) characterizes what the general 
duty entails during periods of SSM. With the elimination of the SSM 
exemption, there is no need to differentiate between normal operations, 
startup and shutdown, and malfunction events in describing the general 
duty. Therefore, the language the EPA is proposing for 40 CFR 
63.7810(c) does not include that language from 40 CFR 63.6(e)(1).
    We are also proposing to revise the General Provisions table (Table 
4) by adding an entry for 40 CFR 63.6(e)(1)(ii) and including a ``no'' 
in column 3. Section 63.6(e)(1)(ii) imposes requirements that are not 
necessary with the elimination of the SSM exemption or are redundant 
with the general duty requirement being added at 40 CFR 63.7810(c).
b. SSM Plan
    We are proposing to revise the General Provisions table (Table 4) 
by adding an entry for 40 CFR 63.6(e)(3) and including a ``no'' in 
column 3. Generally, the paragraphs under 40 CFR 63.6(e)(3) require 
development of an SSM plan and specify SSM recordkeeping and reporting 
requirements related to the SSM plan. As noted, the EPA is proposing to 
remove the SSM exemptions. Therefore, affected units will be subject to 
an emission standard during such events. The applicability of a 
standard during such events will ensure that sources have ample 
incentive to plan for and achieve compliance and, thus, the SSM plan 
requirements are no longer necessary.
c. Compliance With Standards
    We are proposing to revise the General Provisions table (Table 4) 
by adding an entry for 40 CFR 63.6(f)(1) and including a ``no'' in 
column 3. The current language of 40 CFR 63.6(f)(1) exempts sources 
from non-opacity standards during periods of SSM. As discussed above, 
the Court in Sierra Club vacated the exemptions contained in this 
provision and held that the CAA requires that some CAA section 112 
standards apply continuously. Consistent with Sierra Club, the EPA is 
proposing to revise standards in this rule to apply at all times.
    We are proposing to revise the General Provisions table (Table 4) 
by adding an entry for 40 CFR 63.6(h)(1) and including a ``no'' in 
column 3. The current language of 40 CFR 63.6(h)(1) exempts sources 
from opacity standards during periods of SSM. As discussed above, the 
Court in Sierra Club vacated the exemptions contained in this provision 
and held that the CAA requires that some CAA section 112 standards 
apply continuously. Consistent with Sierra Club, the EPA is proposing 
to revise standards in this rule to apply at all times.
d. 40 CFR 63.7822 and 63.7823 Performance Testing
    We are proposing to revise the General Provisions table (Table 4) 
by adding an entry for 40 CFR 63.7(e)(1) and including a ``no'' in 
column 3. Section 63.7(e)(1) describes performance testing 
requirements. The EPA is instead proposing to add a performance testing 
requirement at 40 CFR 63.7822(a) and 63.7823(a). The performance 
testing requirements we are proposing to add differ from the General 
Provisions performance testing provisions in several respects. The 
regulatory text does not include the language in 40 CFR 63.7(e)(1) that 
restated the SSM exemption and language that precluded startup and 
shutdown periods from being considered ``representative'' for purposes 
of performance testing. The revised performance testing provisions 
require testing under representative operating conditions and exclude 
periods of startup and shutdown.
    As in 40 CFR 63.7(e)(1), performance tests conducted under this 
subpart should not be conducted during malfunctions because conditions 
during malfunctions are often not representative of normal operating 
conditions. The EPA is proposing to add language that requires the 
owner or operator to record the process information that is necessary 
to document operating conditions during the test and include in such 
record an explanation to support that such conditions represent normal 
operation. Section 63.7(e) requires that the owner or operator make 
available to the Administrator such records ``as may be necessary to 
determine the condition of the performance test'' available to the 
Administrator upon request but does not specifically require the 
information

[[Page 42735]]

to be recorded. The regulatory text the EPA is proposing to add to this 
provision builds on that requirement and makes explicit the requirement 
to record the information.
e. Monitoring
    We are proposing to revise the General Provisions table (Table 4) 
by adding entries for 40 CFR 63.8(c)(1)(i) and (iii) and including a 
``no'' in column 3. The cross-references to the general duty and SSM 
plan requirements in those subparagraphs are not necessary in light of 
other requirements of 40 CFR 63.8 that require good air pollution 
control practices (40 CFR 63.8(c)(1)) and that set out the requirements 
of a quality control program for monitoring equipment (40 CFR 63.8(d)).
    We are proposing to revise the General Provisions table (Table 4) 
by adding an entry for 40 CFR 63.8(d)(3) and including a ``no'' in 
column 3. The final sentence in 40 CFR 63.8(d)(3) refers to the General 
Provisions' SSM plan requirement which is no longer applicable. The EPA 
is proposing to add to the rule at 40 CFR 63.7842(b)(3) text that is 
identical to 40 CFR 63.8(d)(3) except that the final sentence is 
replaced with the following sentence: ``The program of corrective 
action should be included in the plan required under Sec.  
63.8(d)(2).''
f. 40 CFR 63.7842 Recordkeeping
    We are proposing to revise the General Provisions table (Table 4) 
by adding an entry for 40 CFR 63.10(b)(2)(i) and including a ``no'' in 
column 3. Section 63.10(b)(2)(i) describes the recordkeeping 
requirements during startup and shutdown. These recording provisions 
are no longer necessary because the EPA is proposing that recordkeeping 
and reporting applicable to normal operations would apply to startup 
and shutdown. In the absence of special provisions applicable to 
startup and shutdown, such as a startup and shutdown plan, there is no 
reason to retain additional recordkeeping for startup and shutdown 
periods.
    We are proposing to revise the General Provisions table (Table 4) 
by adding an entry for 40 CFR 63.10(b)(2)(ii) and including a ``no'' in 
column 3. Section 63.10(b)(2)(ii) describes the recordkeeping 
requirements during a malfunction. The EPA is proposing to add such 
requirements to 40 CFR 63.7842. The regulatory text we are proposing to 
add differs from the General Provisions it is replacing in that the 
General Provisions requires the creation and retention of a record of 
the occurrence and duration of each malfunction of process, air 
pollution control, and monitoring equipment. The EPA is proposing that 
this requirement apply to any failure to meet an applicable standard 
and is requiring that the source record the date, time, and duration of 
the failure rather than the ``occurrence.'' The EPA is also proposing 
to add to 40 CFR 63.7842(a)(4) a requirement that sources keep records 
that include a list of the affected source or equipment and actions 
taken to minimize emissions, an estimate of the quantity of each 
regulated pollutant emitted over the standard for which the source 
failed to meet the standard, and a description of the method used to 
estimate the emissions. Examples of such methods would include product-
loss calculations, mass balance calculations, measurements when 
available, or engineering judgment based on known process parameters. 
The EPA is proposing to require that sources keep records of this 
information to ensure that there is adequate information to allow the 
EPA to determine the severity of any failure to meet a standard, and to 
provide data that may document how the source met the general duty to 
minimize emissions when the source has failed to meet an applicable 
standard.
    We are proposing to revise the General Provisions table (Table 4) 
by adding an entry for 40 CFR 63.10(b)(2)(iv) and including a ``no'' in 
column 3. When applicable, the provision requires sources to record 
actions taken during SSM events when actions were inconsistent with 
their SSM plan. The requirement is no longer appropriate because SSM 
plans would no longer be required. The requirement previously 
applicable under 40 CFR 63.10(b)(2)(iv)(B) to record actions to 
minimize emissions and record corrective actions is now applicable by 
reference to 40 CFR 63.7842(a)(5).
    We are proposing to revise the General Provisions table (Table 4) 
by adding an entry for 40 CFR 63.10(b)(2)(v) and including a ``no'' in 
column 3. When applicable, the provision requires sources to record 
actions taken during SSM events to show that actions taken were 
consistent with their SSM plan. The requirement is no longer 
appropriate because SSM plans would no longer be required.
    We are proposing to revise the General Provisions table (Table 4) 
by adding an entry for 40 CFR 63.10(c)(15) and including a ``no'' in 
column 3. The EPA is proposing that 40 CFR 63.10(c)(15) no longer 
apply. When applicable, the provision allows an owner or operator to 
use the affected source's SSM plan or records kept to satisfy the 
recordkeeping requirements of the SSM plan, specified in 40 CFR 
63.6(e), to also satisfy the requirements of 40 CFR 63.10(c)(10) 
through (12). The EPA is proposing to eliminate this requirement 
because SSM plans would no longer be required, and, therefore, 40 CFR 
63.10(c)(15) no longer serves any useful purpose for affected units.
g. 40 CFR 63.7841 Reporting
    We are proposing to revise the General Provisions table (Table 4) 
by adding an entry for 40 CFR 63.10(d)(5)(i) and including a ``no'' in 
column 3. Section 63.10(d)(5)(i) describes the reporting requirements 
for startups, shutdowns, and malfunctions. To replace the General 
Provisions reporting requirement, the EPA is proposing to add reporting 
requirements to 40 CFR 63.7841(b)(4). The replacement language differs 
from the General Provisions requirement in that it eliminates periodic 
SSM reports as a stand-alone report. We are proposing language that 
requires sources that fail to meet an applicable standard at any time 
to report the information concerning such events in the semiannual 
reporting period compliance report already required under this rule. We 
are proposing that the report would contain the number, date, time, 
duration, and the cause of such events (including unknown cause, if 
applicable), a list of the affected source or equipment, an estimate of 
the quantity of each regulated pollutant emitted over any emission 
limit, and a description of the method used to estimate the emissions.
    Examples of such methods would include product-loss calculations, 
mass balance calculations, measurements when available, or engineering 
judgment based on known process parameters. The EPA is proposing this 
requirement to ensure that there is adequate information to determine 
compliance, to allow the EPA to determine the severity of the failure 
to meet an applicable standard, and to provide data that may document 
how the source met the general duty to minimize emissions during a 
failure to meet an applicable standard.
    We would no longer require owners or operators to determine whether 
actions taken to correct a malfunction are consistent with an SSM plan, 
because plans would no longer be required. The proposed amendments, 
therefore, eliminate the cross reference to 40 CFR 63.10(d)(5)(i) that 
contains the description of the previously required SSM report format 
and submittal schedule from this section. These specifications are no 
longer

[[Page 42736]]

necessary because the events would be reported in otherwise required 
reports with similar format and submittal requirements.
    We are proposing to revise the General Provisions table (Table 4) 
by adding an entry for 40 CFR 63.10(d)(5)(ii) and including a ``no'' in 
column 3. Section 63.10(d)(5)(ii) describes an immediate report for 
startups, shutdown, and malfunctions when a source failed to meet an 
applicable standard but did not follow the SSM plan. We would no longer 
require owners and operators to report when actions taken during a 
startup, shutdown, or malfunction were not consistent with an SSM plan, 
because plans would no longer be required.
2. Electronic Reporting
    Through this proposal, the EPA is proposing that owners and 
operators of integrated iron and steel manufacturing facilities submit 
the required electronic copies of summaries of performance test results 
and semiannual reports through the EPA's Central Data Exchange (CDX) 
using the Compliance and Emissions Data Reporting Interface (CEDRI). A 
description of the electronic data submission process is provided in 
the memorandum, Electronic Reporting Requirements for New Source 
Performance Standards (NSPS) and National Emission Standards for 
Hazardous Air Pollutants (NESHAP) Rules, available in Docket ID No. 
EPA-HQ-OAR-2002-0083. The proposed rule requires that performance test 
results collected using test methods that are supported by the EPA's 
Electronic Reporting Tool (ERT), as listed on the ERT website \35\ at 
the time of the test, be submitted in the format generated through the 
use of the ERT, and that other performance test results be submitted in 
portable document format (PDF) using the attachment module of the ERT. 
Similarly, performance evaluation results of continuous monitoring 
systems measuring relative accuracy test audit pollutants that are 
supported by the ERT at the time of the test would be submitted in the 
format generated through the use of the ERT and other performance 
evaluation results be submitted in PDF using the attachment module of 
the ERT.
---------------------------------------------------------------------------

    \35\ https://www.epa.gov/electronic-reporting-air-emissions/electronic-reporting-tool-ert.
---------------------------------------------------------------------------

    For semiannual compliance reports, the proposed rule requires that 
owners and operators use the appropriate spreadsheet template to submit 
information to CEDRI. A draft version of the proposed template for 
these reports is included in the docket for this rulemaking.\36\ The 
EPA specifically requests comment on the content, layout, and overall 
design of the template.
---------------------------------------------------------------------------

    \36\ See 40 CFR part 63, subpart FFFFF, National Emission 
Standards for Hazardous Air Pollutants: Integrated Iron and Steel 
Manufacturing Facilities--40 CFR 63.7841(b), Semiannual Compliance 
Report Spreadsheet Template, available at Docket ID. No. EPA-HQ-OAR-
2002-0083.
---------------------------------------------------------------------------

    Additionally, the EPA has identified two broad circumstances in 
which electronic reporting extensions may be provided. In both 
circumstances, the decision to accept the claim of needing additional 
time to report is within the discretion of the Administrator, and 
reporting should occur as soon as possible. The EPA is providing these 
potential extensions to protect owners and operators from noncompliance 
in cases where they cannot successfully submit a report by the 
reporting deadline for reasons outside of their control. The situation 
where an extension may be warranted due to outages of the EPA's CDX or 
CEDRI which precludes an owner or operator from accessing the system 
and submitting required reports is addressed in 40 CFR 63.7841(e). The 
situation where an extension may be warranted due to a force majeure 
event, which is defined as an event that would be or has been caused by 
circumstances beyond the control of the affected facility, its 
contractors, or any entity controlled by the affected facility that 
prevents an owner or operator from complying with the requirement to 
submit a report electronically as required by this rule is addressed in 
40 CFR 63.7841(f). Examples of such events are acts of nature, acts of 
war or terrorism, or equipment failure or safety hazards beyond the 
control of the facility.
    The electronic submittal of the reports addressed in this proposed 
rulemaking will increase the usefulness of the data contained in those 
reports, is in keeping with current trends in data availability and 
transparency, will further assist in the protection of public health 
and the environment, will improve compliance by facilitating the 
ability of regulated facilities to demonstrate compliance with 
requirements, and by facilitating the ability of delegated state, 
local, tribal, and territorial air agencies and the EPA to assess and 
determine compliance, and will ultimately reduce burden on regulated 
facilities, delegated air agencies, and the EPA. Electronic reporting 
also eliminates paper-based, manual processes, thereby saving time and 
resources, simplifying data entry, eliminating redundancies, minimizing 
data reporting errors, and providing data quickly and accurately to the 
affected facilities, air agencies, the EPA, and the public. Moreover, 
electronic reporting is consistent with the EPA's plan \37\ to 
implement Executive Order 13563 and is in keeping with the EPA's 
Agency-wide policy \38\ developed in response to the White House's 
Digital Government Strategy.\39\ For more information on the benefits 
of electronic reporting, see the memorandum titled Electronic Reporting 
Requirements for New Source Performance Standards (NSPS) and National 
Emission Standards for Hazardous Air Pollutants (NESHAP) Rules, 
available in Docket ID No. EPA-HQ-OAR-2002-0083.
---------------------------------------------------------------------------

    \37\ EPA's Final Plan for Periodic Retrospective Reviews, August 
2011. Available at: https://www.regulations.gov/document?D=EPA-HQ-OA-2011-0156-0154.
    \38\ E-Reporting Policy Statement for EPA Regulations, September 
2013. Available at: https://www.epa.gov/sites/production/files/2016-03/documents/epa-ereporting-policy-statement-2013-09-30.pdf.
    \39\ Digital Government: Building a 21st Century Platform to 
Better Serve the American People, May 2012. Available at: https://obamawhitehouse.archives.gov/sites/default/files/omb/egov/digital-government/digital-government.html.
---------------------------------------------------------------------------

3. Incorporation by Reference Under 1 CFR Part 51
    The EPA is proposing regulatory text that includes incorporation by 
reference (IBR). In accordance with requirements of 1 CFR 51.5, the EPA 
is proposing to incorporate by reference the following documents 
described in the amendments to 40 CFR 63.14:
     ANSI/ASME PTC 19.10-1981, Flue and Exhaust Gas Analyses 
[Part 10, Instruments and Apparatus], (Issued August 31, 1981), IBR 
approved for 40 CFR 63.7822(b) and 63.7824(e). This method determines 
quantitatively the gaseous constituents of exhausts resulting from 
stationary combustion sources. The gases covered in the method are 
oxygen, carbon dioxide, carbon monoxide, nitrogen, sulfur dioxide, 
sulfur trioxide, nitric oxide, nitrogen dioxide, hydrogen sulfide, and 
hydrocarbons.
     EPA-454/R-98-015, Office of Air Quality Planning and 
Standards (OAQPS), Fabric Filter Bag Leak Detection Guidance, September 
1997, IBR approved for 40 CFR 63.7831(f). This document provides 
guidance on the use of triboelectric monitors as fabric filter bag leak 
detectors. The document includes fabric filter and monitoring system 
descriptions; guidance on monitor selection, installation, setup, 
adjustment, and operation; and quality assurance procedures.
    The EPA has made, and will continue to make, the EPA document 
generally

[[Page 42737]]

available electronically through https://www.regulations.gov/ and at 
the EPA Docket Center (see the ADDRESSES section of this preamble for 
more information). The ANSI/ASME document is available from the 
American Society of Mechanical Engineers (ASME) at http://www.asme.org; 
by mail at Three Park Avenue, New York, NY 10016-5990; or by telephone 
at (800) 843-2763.
4. Technical and Editorial Changes
    The following lists additional proposed changes that address 
technical and editorial corrections:
     Revised 40 CFR 63.7822 and 63.7823 to specify the 
conditions for conducting performance tests;
     Revised 40 CFR 63.7822, 63.7823, 63.7824, and 63.7833 to 
clarify the location in 40 CFR part 60 of applicable EPA test methods;
     Revised 40 CFR 63.7822 and 63.7824 to add IBR for ANSI/
ASME PTC 19.10-1981;
     Revised Tables 1 and 3 to clarify that opacity 
observations be made at all openings to the BF casthouse;
     Revised Tables 1, 2, and 3 to clarify that the affected 
source is each BOPF shop, rather than only the roof monitor at the BOPF 
shop;
     Revised Table 1 to add a mercury emission limit, revised 
Table 2 to add demonstration of initial compliance with the mercury 
emission limit, and revised Table 3 to add demonstration of continuous 
compliance with the mercury emission limit
     Revised 40 CFR 63.7831 to add IBR for EPA-454/R-98-015;
     Revised 40 CFR 63.7835, 63.7841, and 63.7842 to include 
the requirements to record and report information on failures to meet 
the applicable standard; and
     Revised 40 CFR 63.7852 to add definitions for ``basic 
oxygen process furnace group,'' ``mercury switch,'' ``motor vehicle,'' 
``motor vehicle scrap,'' ``opening,'' ``post-consumer steel scrap,'' 
``pre-consumer steel scrap,'' ``steel scrap,'' and ``scrap provider.''

F. What compliance dates are we proposing?

    Because most of these amendments provide corrections and 
clarifications to the current rule and do not impose new requirements 
on the industry, we are proposing that these amendments become 
effective 180 days after promulgation of the final rule, except for the 
provisions for mercury control via scrap selection or meeting scrap 
input-based emission standards, for which we are requiring compliance 
for existing sources within 1 year of promulgation. New sources, 
defined to be new BOPF or facilities constructed or reconstructed after 
August 16, 2019, are subject to the new source mercury limit on the 
effective date of the final rule.
    We are proposing the 1-year existing source compliance date to 
allow facilities to switch scrap suppliers, if needed, and become 
familiar with the reporting requirements for scrap providers; for 
facilities who would choose to comply with the input-based mercury 
scrap limit, the compliance date was chosen so as to allow for 
arrangements for testing and reporting of test results. We solicit 
comments on the timeframe for compliance and the ability of facilities 
to comply within this timeframe.
    Our experience with similar industries that are required to convert 
reporting mechanisms, install necessary hardware and software, become 
familiar with the process of submitting performance test results 
electronically through the EPA's CEDRI, test these new electronic 
submission capabilities, reliably employ electronic reporting, and 
convert logistics of reporting processes to different time-reporting 
parameters, shows that a time period of a minimum of 90 days, and more 
typically, 180 days, is generally necessary to successfully complete 
these changes. Our experience with similar industries further shows 
that this sort of regulated facility generally requires a time period 
of 180 days to read and understand the amended rule requirements; 
evaluate their operations to ensure that they can meet the standards 
during periods of startup and shutdown as defined in the rule and make 
any necessary adjustments; adjust parameter monitoring and recording 
systems to accommodate revisions; and update their operations to 
reflect the revised requirements. The EPA recognizes the confusion that 
multiple different compliance dates for individual requirements would 
create and the additional burden such an assortment of dates would 
impose. From our assessment of the timeframe needed for compliance with 
the entirety of the revised requirements excluding the mercury 
requirements, the EPA considers a period of 180 days to be the most 
expeditious compliance period practicable, and, thus, is proposing that 
existing affected sources be in compliance with all of this 
regulation's revised requirements within 180 days of the regulation's 
effective date.

V. Summary of Cost, Environmental, and Economic Impacts

A. What are the affected sources?

    These proposed amendments to the Integrated Iron and Steel 
Manufacturing NESHAP include rule updates that address electronic 
reporting requirements and changes in policies regarding SSM that 
affect all integrated iron and steel manufacturing facilities. The 
proposed requirement to purchase scrap from scrap providers who certify 
they participate in the NVMSRP or a similar approved program or use 
scrap not likely to contain mercury would affect any facility that uses 
post-consumer steel scrap in their BOPFs, potentially all integrated 
iron and steel manufacturing facilities.

B. What are the air quality impacts?

    We are proposing scrap selection requirements to control and reduce 
mercury emissions. Air quality is expected to improve as a result of 
the proposed amendments in proportion to the number of facilities that 
are not currently purchasing scrap from providers who participate in 
the NVMSRP or another approved program, or who use scrap not likely to 
contain mercury. We solicit comment on this assumption of air quality 
improvements and the extent of such improvements.
    Although we are not proposing requirements to control HAP emitted 
from nonpoint sources, the work practices presented as potential 
methods to control these emissions would improve air quality. We 
solicit comment on the potential for improvement in air quality by 
reduction in HAP and PM2.5 with the implementation of the 
work practices for nonpoint sources.

C. What are the cost impacts?

    In this proposal, as described above, we are proposing compliance 
testing or scrap selection requirements to control and reduce mercury 
emissions. We expect that facilities that choose scrap selection likely 
will not incur operational costs to comply with this requirement 
because we believe that most, if not all, facilities are already 
purchasing scrap from providers who participate in the NVMSRP. However, 
we estimate a cost of $1,058 per year per facility and $11,638 per year 
for all 11 facilities in the industry, for recordkeeping and reporting 
of compliance with the program. We solicit comment on this assumption 
and the estimated costs for the proposed mercury standard.
    Although we are not proposing requirements to control HAP emitted

[[Page 42738]]

from seven nonpoint sources, we estimate that the work practices 
evaluated to reduce these emissions would cost an estimated $8.7 
million in capital costs and $3 million annually to the industry if 
they were included in the rule. We estimate the total capital costs of 
proposing requirements to control HAP from the two nonpoint sources of 
BF casthouse and BOPF shop to be about $1.4 million and annualized 
costs to be about $1.7 million per year. These costs are described in 
the memorandum titled Cost Estimates and Other Impacts for the 
Integrated Iron and Steel Risk and Technology Review, available in the 
docket to this rule. We solicit comment on these estimated costs of 
implementation of work practices for nonpoint sources.

D. What are the economic impacts?

    No economic impacts are expected to be incurred by integrated iron 
and steel manufacturing facilities due to the proposed mercury standard 
because we believe that most, if not all, facilities are already 
purchasing scrap from providers who participate in the NVMSRP. We 
solicit comment on this assumption.
    Although we are not proposing requirements to control HAP emitted 
from nonpoint sources, the work practices evaluated to reduce these 
emissions could have an economic impact on facilities if they were 
required. We solicit comment on the potential economic impact on 
integrated iron and steel manufacturing facilities if implementation of 
these work practices for nonpoint sources was required. There may be 
energy savings from reducing leaks of BF gas from bells, which is one 
of the work practices described in this preamble. We solicit comment on 
the potential cost savings for integrated iron and steel manufacturing 
facilities with implementation of this work practice.

E. What are the benefits?

    The proposed amendments may result in some unquantified reductions 
in emissions of mercury, depending on the extent of current limitation 
of mercury input or participation in the scrap selection program by 
integrated iron and steel manufacturing facilities. While the EPA 
believes most, or all, facilities are already meeting the proposed 
mercury standard, to the extent that additional reductions may be 
achieved, if finalized, this rule would result in improved health in 
surrounding populations, especially protection of children from the 
negative health impacts of mercury exposure.
    The proposed requirements to submit reports and test results 
electronically would improve monitoring, compliance, and implementation 
of the rule.
    Although we are not proposing requirements to control HAP emitted 
from nonpoint sources, the work practices evaluated to reduce these HAP 
emissions (with concurrent control of PM and PM2.5) and for 
which EPA is soliciting comment on, if adopted, could improve air 
quality and health of persons living in surrounding communities.

VI. Request for Comments

    We solicit comments on this proposal. In addition to general 
comments on this proposed action, we are especially interested in 
receiving comments regarding the estimated emissions from nonpoint 
(UFIP) sources, the potential for the work practices, individually or 
together, to reduce emissions from the nonpoint sources, and the 
estimated costs of the work practices. We are also interested in 
additional data that may improve the risk assessments and other 
analyses. We are specifically interested in receiving any improvements 
to the data used in the site-specific emissions profiles used in the 
risk assessment, including the estimates and assumptions used for the 
example facility risk assessment. Such data should include supporting 
documentation in sufficient detail to allow characterization of the 
quality and representativeness of the data or information. Section VII 
of this preamble provides more information on submitting data.

VII. Submitting Data Corrections

    The site-specific emissions profiles used in the source category 
risk and demographic analyses and instructions are available for 
download on the RTR website at https://www.epa.gov/stationary-sources-air-pollution/integrated-iron-and-steel-manufacturing-national-emission-standards. The data files include detailed information for 
each HAP emissions release point for the facilities in the source 
category.
    If you believe that the data are not representative or are 
inaccurate, please identify the data in question, provide your reason 
for concern, and provide any ``improved'' data that you have, if 
available. When you submit data, we request that you provide 
documentation of the basis for the revised values to support your 
suggested changes. To submit comments on the data downloaded from the 
RTR website, complete the following steps:
    1. Within this downloaded file, enter suggested revisions to the 
data fields appropriate for that information.
    2. Fill in the commenter information fields for each suggested 
revision (i.e., commenter name, commenter organization, commenter email 
address, commenter phone number, and revision comments).
    3. Gather documentation for any suggested emissions revisions 
(e.g., performance test reports, material balance calculations).
    4. Send the entire downloaded file with suggested revisions in 
Microsoft[supreg] Access format and all accompanying documentation to 
Docket ID No. EPA-HQ-OAR-2002-0083 (through the method described in the 
ADDRESSES section of this preamble).
    5. If you are providing comments on a single facility or multiple 
facilities, you need only submit one file for all facilities. The file 
should contain all suggested changes for all sources at that facility 
(or facilities). We request that all data revision comments be 
submitted in the form of updated Microsoft[supreg] Excel files that are 
generated by the Microsoft[supreg] Access file. These files are 
provided on the RTR website at https://www.epa.gov/stationary-sources-air-pollution/integrated-iron-and-steel-manufacturing-national-emission-standards.

VIII. 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 Order 12866: Regulatory Planning and Review and Executive 
Order 13563: Improving Regulation and Regulatory Review

    This action is a significant regulatory action that was submitted 
to OMB for review because it has novel legal and policy issues. Any 
changes made in response to OMB recommendations have been documented in 
the docket.

B. Executive Order 13771: Reducing Regulation and Controlling 
Regulatory Costs

    This action is not expected to be subject to Executive Order 13771 
because this proposed rule is expected to result in no more than de 
minimis costs.

C. Paperwork Reduction Act (PRA)

    The information collection activities in this proposed rule have 
been submitted for approval to OMB under the PRA. The ICR document that 
the EPA prepared has been assigned EPA ICR number 2003.08. You can find 
a copy of the ICR in the docket for this rule, and it is briefly 
summarized here.

[[Page 42739]]

    We are proposing amendments that require electronic reporting; 
remove the SSM exemptions; and impose other revisions that affect 
reporting and recordkeeping for integrated iron and steel manufacturing 
facilities. We are also proposing standards for mercury that will 
require facilities to certify the type of steel scrap they use. This 
information would be collected to assure compliance with 40 CFR part 
63, subpart FFFFF.
    Respondents/affected entities: Integrated iron and steel 
manufacturing facilities.
    Respondent's obligation to respond: Mandatory (40 CFR part 63, 
subpart FFFFF).
    Estimated number of respondents: 11 facilities.
    Frequency of response: One time.
    Total estimated burden of entire rule: The annual recordkeeping and 
reporting burden for facilities to comply with all of the requirements 
in the NESHAP is estimated to be 6,500 hours (per year). Burden is 
defined at 5 CFR 1320.3(b).
    Total estimated cost of entire rule: The annual recordkeeping and 
reporting cost for all facilities to comply with all of the 
requirements in the NESHAP is estimated to be $800,000 (per year), of 
which $20,000 (per year) is for this proposal, and $780,000 is for 
other costs related to continued compliance with the NESHAP including 
$50,300 for paperwork associated with operation and maintenance 
requirements. The total rule costs reflect a savings of $240,000 (per 
year) from the previous ICR due to the transition to electronic 
reporting.
    An agency may not conduct or sponsor, and a person is not required 
to respond to, a collection of information unless it displays a 
currently valid OMB control number. The OMB control numbers for the 
EPA's regulations in 40 CFR are listed in 40 CFR part 9.
    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 rule. You may also send your ICR-related 
comments to OMB's Office of Information and Regulatory Affairs via 
email to OIRA_submission@omb.eop.gov, Attention: Desk Officer for the 
EPA. Since OMB is required to make a decision concerning the ICR 
between 30 and 60 days after receipt, OMB must receive comments no 
later than September 16, 2019. The EPA will respond to any ICR-related 
comments in the final rule.

D. Regulatory Flexibility Act (RFA)

    I certify that this action would not have a significant economic 
impact on a substantial number of small entities under the RFA. This 
action would not impose any requirements on small entities. No small 
entities are subject to the requirements of this rule.

E. Unfunded Mandates Reform Act (UMRA)

    This action does not contain any unfunded mandate as described in 
UMRA, 2 U.S.C. 1531-1538, and does not significantly or uniquely affect 
small governments. The action imposes no enforceable duty on any state, 
local, or tribal governments or the private sector.

F. Executive Order 13132: Federalism

    This action does not have federalism implications. It will not have 
substantial direct effects on the states, on the relationship between 
the national government and the states, or on the distribution of power 
and responsibilities among the various levels of government.

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

    This action does not have tribal implications as specified in 
Executive Order 13175. It will not have substantial direct effects on 
tribal governments, on the relationship between the Federal government 
and Indian tribes, or on the distribution of power and responsibilities 
between the Federal government and Indian tribes. No tribal governments 
own facilities subject to the NESHAP. Thus, Executive Order 13175 does 
not apply to this action.

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

    This action is not subject to Executive Order 13045 because the EPA 
does not believe the environmental health or safety risks addressed by 
this action present a disproportionate risk to children. This action's 
health and risk assessments are contained in sections III and IV of 
this preamble and further documented in the document titled Residual 
Risk Assessment for the Integrated Iron and Steel Manufacturing Source 
Category in Support of the Risk and Technology Review 2019 Proposed 
Rule, available in the docket for this action.

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

    This action is not a ``significant energy action'' because it is 
not likely to have a significant adverse effect on the supply, 
distribution, or use of energy. Only one new standard is proposed in 
this rule, which under one compliance option would require facilities 
to purchase steel scrap from suppliers who participate in a pollution 
prevention program approved by the EPA, where motor vehicle switches 
containing mercury are removed from steel scrap by the suppliers before 
sale. These suppliers already provide steel scrap to most (or all) of 
the current integrated iron and steel manufacturing facilities.

J. National Technology Transfer and Advancement Act (NTTAA) and 1 CFR 
Part 51

    This action involves technical standards. The EPA proposes to use 
ANSI/ASME PTC 19.10-1981, ``Flue and Exhaust Gas Analyses,'' for its 
manual methods of measuring the oxygen or carbon dioxide content of the 
exhaust gas. This standard is acceptable as an alternative to EPA 
Method 3B and is available from the American Society of Mechanical 
Engineers (ASME) at http://www.asme.org; by mail at Three Park Avenue, 
New York, NY 10016-5990; or by telephone at (800) 843-2763.

K. Executive Order 12898: Federal Actions To Address Environmental 
Justice in Minority Populations and Low-Income Populations

    The EPA believes that this action does not have disproportionately 
high and adverse human health or environmental effects on minority 
populations, low-income populations, and/or indigenous peoples, as 
specified in Executive Order 12898 (59 FR 7629, February 16, 1994).
    The documentation for this decision is contained in section IV.A of 
this preamble and the technical report titled Risk and Technology 
Review--Analysis of Socio-Economic Factors for Populations Living Near 
Integrated Iron and Steel Manufacturing Facilities, available in the 
docket for this rule.
    We examined the potential for any environmental justice issues that 
might be associated with the source category by performing a 
demographic analysis of the population close to the facilities. In this 
analysis, we evaluated the distribution of HAP-related cancer and 
noncancer risks from the NESHAP source category across different 
social, demographic, and economic groups within the populations living 
near

[[Page 42740]]

facilities identified as having the highest risks. The methodology and 
the results of the demographic analyses are included in a technical 
report titled Risk and Technology Review--Analysis of Socio-Economic 
Factors for Populations Living Near Integrated Iron and Steel 
Manufacturing Facilities, available in the docket for this rule.
    The results of the source category demographic analysis for the 
NESHAP (point sources only) indicate that emissions expose 
approximately 60 people to a cancer risk at or above 10-in-1 million 
and none exposed to a chronic noncancer TOSHI greater than or equal to 
1. The specific demographic results indicate that the overall 
percentage of the population potentially impacted by emissions is less 
than its corresponding national percentage for the minority population 
(37 percent for the source category compared to 38-percent nationwide). 
However, the ``African American'' population (29 percent for the source 
category compared to 12 percent nationwide) and the population ``Below 
the Poverty Level'' are greater than their corresponding national 
percentages. The proximity results (irrespective of risk) indicate that 
the population percentages for certain demographic categories within 5 
km of source category emissions are greater than the corresponding 
national percentage for certain demographics groups including: 
``African American,'' ``Ages 0 to 17,'' ``Over age 25 without a high 
school diploma,'' and ``Below the poverty level.''
    The risks due to HAP emissions from this source category are low 
for all populations (i.e., inhalation cancer risks are no greater than 
or equal to 10-in-1 million for all populations and noncancer HI are no 
greater than or equal to 1). Furthermore, we do not expect this 
proposal to achieve significant reductions in HAP emissions. Therefore, 
we conclude that this proposal will not have disproportionately high 
and adverse human health or environmental effects on minority or low-
income populations because it does not affect the level of protection 
provided to human health or the environment. However, this proposal, if 
finalized, will provide additional benefits to these demographic groups 
by improving the compliance, monitoring, and implementation of the 
NESHAP.

List of Subjects in 40 CFR Part 63

    Environmental protection, Air pollution control, Hazardous 
substances, Incorporation by reference, Reporting and recordkeeping 
requirements.

    Dated: August 6, 2019.
Andrew R. Wheeler,
Administrator.
    For the reasons set forth in the preamble, the EPA proposes to 
amend 40 CFR part 63 as follows:

PART 63--NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS 
FOR SOURCE CATEGORIES

0
1. The authority citation for part 63 continues to read as follows:

    Authority: 42 U.S.C. 7401 et seq.

Subpart A--[Amended]

0
2. Section 63.14 is amended by revising paragraphs (e)(1) and (n)(3) to 
read as follows:


Sec.  63.14  Incorporations by reference.

* * * * *
    (e) * * *
    (1) ANSI/ASME PTC 19.10-1981, Flue and Exhaust Gas Analyses [Part 
10, Instruments and Apparatus], issued August 31, 1981, IBR approved 
for Sec. Sec.  63.309(k), 63.457(k), 63.772(e) and (h), 63.865(b), 
63.1282(d) and (g), 63.1625(b), 63.3166(a), 63.3360(e), 63.3545(a), 
63.3555(a), 63.4166(a), 63.4362(a), 63.4766(a), 63.4965(a), 63.5160(d), 
table 4 to subpart UUUU, 63.7822(b), 63.7824(e), 63.7825(b), 
63.9307(c), 63.9323(a), 63.11148(e), 63.11155(e), 63.11162(f), 
63.11163(g), 63.11410(j), 63.11551(a), 63.11646(a), and 63.11945, table 
5 to subpart DDDDD, table 4 to subpart JJJJJ, table 4 to subpart KKKKK, 
tables 4 and 5 of subpart UUUUU, table 1 to subpart ZZZZZ, and table 4 
to subpart JJJJJJ.
* * * * *
    (n) * * *
    (3) EPA-454/R-98-015, Office of Air Quality Planning and Standards 
(OAQPS), Fabric Filter Bag Leak Detection Guidance, September 1997, 
https://nepis.epa.gov/Exe/ZyPDF.cgi?Dockey=2000D5T6.PDF, IBR approved 
for Sec. Sec.  63.548(e), 63.864(e), 63.7525(j), 63.7831(f), 
63.8450(e), 63.8600(e), and 63.11224(f).
* * * * *

Subpart FFFFF--[Amended]

0
3. Section 63.7782 is amended by revising paragraph (c) to read as 
follows:


Sec.  63.7782  What parts of my plant does this subpart cover?

* * * * *
    (c) This subpart addresses emissions from the sinter plant windbox 
exhaust, discharge end, and sinter cooler; the BF and casthouse; and 
the BOPF shop including each individual BOPF and shop ancillary 
operations (hot metal transfer, hot metal desulfurization, slag 
skimming, and ladle metallurgy).
* * * * *
0
4. Section 63.7783 is amended by revising the introductory text of 
paragraph (a) and paragraphs (b) and (c) to read as follows:


Sec.  63.7783  When do I have to comply with this subpart?

    (a) If you have an existing affected source, you must comply with 
each emission limitation, standard, and operation and maintenance 
requirement in this subpart that applies to you by the dates specified 
in paragraphs (a)(1) and (2) of this section.
* * * * *
    (b) If you have a new affected source and its initial startup date 
is on or before May 20, 2003, then you must comply with each emission 
limitation, standard, and operation and maintenance requirement in this 
subpart that applies to you by May 20, 2003.
    (c) If you have a new affected source and its initial startup date 
is after May 20, 2003, you must comply with each emission limitation, 
standard, and operation and maintenance requirement in this subpart 
that applies to you upon initial startup.
* * * * *
0
5. The undesignated center heading before Sec.  63.7790 is revised to 
read as follows:

``Emission Limitations and Standards''

0
6. Section 63.7791 is added to read as follows:


Sec.  63.7791  What are the requirements for the control of mercury 
from scrap?

    Mercury requirements. If you have an existing affected sources, you 
must meet the mercury emission limit for each BOPF Group in Table 1 to 
this subpart or procure steel scrap pursuant to the requirements in 
paragraphs (a) through (c) of this section beginning [DATE 1 YEAR AFTER 
DATE OF PUBLICATION OF FINAL RULE IN THE FEDERAL REGISTER]. If the 
initial startup of your affected source is after August 16, 2019 but 
before [DATE OF PUBLICATION OF FINAL RULE IN THE FEDERAL REGISTER], you 
must comply with the mercury requirements beginning [DATE OF 
PUBLICATION OF FINAL RULE IN THE FEDERAL REGISTER]. If the initial 
startup of your affected source is after [DATE OF PUBLICATION OF FINAL 
RULE IN THE FEDERAL REGISTER], then you must comply

[[Page 42741]]

with the mercury requirements upon initial startup of your affected 
source. For participation in the National Vehicle Mercury Switch 
Recovery Program (NVMSRP), you must procure scrap pursuant to the 
requirements in paragraph (a) of this section for each scrap provider, 
contract, or shipment. For scrap not likely to contain motor vehicle 
scrap, you must procure scrap pursuant to the requirements in paragraph 
(b) of this section for each scrap provider, contract, or shipment. For 
scrap obtained under another EPA-approved program, you must procure 
scrap pursuant to the requirements in paragraph (c) of this section for 
each scrap provider, contract, or shipment. You may have certain scrap 
providers, contracts, or shipments subject to one compliance provision 
and others subject to another compliance provision.
    (a) Participation in the NVMSRP. (1) You must obtain all post-
consumer scrap likely to contain vehicle scrap from scrap providers who 
participate in the NVMSRP. The NVMSRP is an EPA-approved program under 
this section unless and until the Administrator disapproves the program 
(in part or in whole);
    (2) You must certify in your notification of compliance status that 
you purchase post-consumer steel scrap according to paragraph (a)(1) of 
this section;
    (3) If you purchase scrap from a broker, you must certify that all 
scrap received from that broker was obtained from other scrap providers 
who participate in the NVMSRP;
    (4) You must develop and maintain onsite a plan demonstrating the 
manner through which your facility is participating in the NVMSRP. The 
plan must include facility-specific implementation elements, corporate-
wide policies, and/or efforts coordinated by a trade association as 
appropriate for each facility. The plan must include a list of all 
suppliers and proof of participation in an approved mercury reduction 
program. You must provide in the plan documentation of direction to 
appropriate staff to communicate to suppliers throughout the scrap 
supply chain the need to promote the removal of mercury switches from 
end-of-life vehicles. Upon the request of the permitting authority, you 
must provide examples of materials that are used for outreach to 
suppliers, such as letters, contract language, policies for purchasing 
agents, and scrap inspection protocols; and
    (5) You must conduct periodic inspections or provide other means of 
corroboration to ensure that scrap providers and brokers are aware of 
the need for and are implementing appropriate steps to minimize the 
presence of mercury in scrap from end-of-life vehicles.
    (b) Scrap not likely to contain motor vehicle scrap. For scrap not 
subject to the requirements in paragraphs (a) and (c) of this section, 
you must:
    (1) Obtain information from scrap suppliers or other entity with 
established knowledge of scrap content that the steel scrap used is not 
likely to contain motor vehicle scrap and maintain records of the 
information; and
    (2) Certify in your notification of compliance status that the 
scrap is not likely to contain motor vehicle scrap, according to the 
information obtained and recorded.
    (c) Use of approved mercury program. (1) You must obtain all post-
consumer scrap likely to contain vehicle scrap from scrap providers who 
participate in a program for the removal of mercury switches that has 
been approved by the Administrator based on the criteria in paragraphs 
(c)(1)(i) through (iii) of this section;
    (i) The program includes outreach that informs the dismantlers of 
the need for removal of mercury switches and provides training and 
guidance for removing mercury switches;
    (ii) The program has a goal to remove at least 80 percent of 
mercury switches from the motor vehicle scrap the scrap provider 
processes. Although a program approved under paragraph (c) of this 
section may require only the removal of convenience light switch 
mechanisms, the Administrator will credit all documented and verifiable 
mercury-containing components removed from motor vehicle scrap (such as 
sensors in anti-locking brake systems, security systems, active ride 
control, and other applications) when evaluating progress towards the 
80 percent goal; and
    (iii) The program sponsor agrees to submit progress reports to the 
Administrator no less frequently than once every year that provide the 
number of mercury switches removed or the weight of mercury recovered 
from the switches, the estimated number of vehicles processed, an 
estimate of the percent of mercury switches recovered, and 
certification that the recovered mercury switches were recycled at 
facilities with permits as required under the rules implementing 
subtitle C of RCRA (40 CFR parts 261 through 265 and 268). The progress 
reports must be based on a database that includes data for each program 
participant; however, data may be aggregated at the State level for 
progress reports that will be publicly available. The Administrator may 
change the approval status of a program or portion of a program (e.g., 
at the State level) following a 90-day notice based on the progress 
reports or on other information;
    (2) You must certify in your notification of compliance status that 
you purchase post-consumer steel scrap according to paragraph (c)(1) of 
this section;
    (3) If you purchase scrap from a broker, you must certify that all 
scrap received from that broker was obtained from other scrap providers 
who participate in a program for the removal of mercury switches that 
has been approved by the Administrator based on the criteria in 
paragraphs (c)(1)(i) through (iii) of this section;
    (4) You must develop and maintain onsite a plan demonstrating the 
manner through which your facility is participating in the EPA-approved 
program. The plan must include facility-specific implementation 
elements, corporate-wide policies, and/or efforts coordinated by a 
trade association as appropriate for each facility. The plan must 
include a list of all suppliers and proof of participation in an 
approved mercury reduction program. You must provide in the plan 
documentation of direction to appropriate staff to communicate to 
suppliers throughout the scrap supply chain the need to promote the 
removal of mercury switches from end-of-life vehicles. Upon the request 
of the permitting authority, you must provide examples of materials 
that are used for outreach to suppliers, such as letters, contract 
language, policies for purchasing agents, and scrap inspection 
protocols; and
    (5) You must conduct periodic inspections or provide other means of 
corroboration to ensure that scrap providers and brokers are aware of 
the need for and are implementing appropriate steps to minimize the 
presence of mercury in scrap from end-of-life vehicles.
0
7. Section 63.7800 is amended by revising paragraph (a) and the 
introductory text of paragraph (b) and adding paragraph (b)(8) to read 
as follows:


Sec.  63.7800  What are my operation and maintenance requirements?

    (a) As required by Sec.  63.7810(c), you must always operate and 
maintain your affected source, including air pollution control and 
monitoring equipment, in a manner consistent with good air pollution 
control practices for minimizing emissions at least to the levels 
required by this subpart.
    (b) You must prepare and operate at all times according to a 
written operation and maintenance plan for

[[Page 42742]]

each capture system or control device subject to an operating limit in 
Sec.  63.7790(b). Each plan must address the elements in paragraphs 
(b)(1) through (8) of this section.
* * * * *
    (8) The compliance procedures within the operation and maintenance 
plan shall not include any periods of startup or shutdown in emissions 
calculations.
0
8. Section 63.7810 is amended by revising paragraphs (a) and (c) to 
read as follows:


Sec.  63.7810  What are my general requirements for complying with this 
subpart?

    (a) You must be in compliance with the emission limitations, 
standards, and operation and maintenance requirements in this subpart 
at all times.
* * * * *
    (c) At all times, you must operate and maintain any affected 
source, including associated air pollution control equipment and 
monitoring equipment, in a manner consistent with safety and good air 
pollution control practices for minimizing emissions. Determination of 
whether a source is operating in compliance with operation and 
maintenance requirements will be based on information available to the 
Administrator which may include, but is not limited to, monitoring 
results, review of operation and maintenance procedures, review of 
operation and maintenance records, and inspection of the source.
0
9. Section 63.7821 is amended by revising paragraph (a) and adding 
paragraph (e) to read as follows:


Sec.  63.7821  When must I conduct subsequent performance tests?

    (a) You must conduct subsequent performance tests to demonstrate 
compliance with all applicable emission and opacity limits in Table 1 
to this subpart at the frequencies specified in paragraphs (b) through 
(e) of this section.
* * * * *
    (e) For each BOPF Group, if complying with the mercury emission 
limit in Table 1, you must conduct subsequent performance tests 
annually at the outlet of the control devices for the BOPF Group, with 
no two consecutive annual performance tests occurring less than 3 
months apart or more than 15 months apart.
0
10. Section 63.7822 is amended by revising paragraphs (a) and (b)(1) to 
read as follows:


Sec.  63.7822  What test methods and other procedures must I use to 
demonstrate initial compliance with the emission limits for particulate 
matter?

    (a) You must conduct each performance test that applies to your 
affected source based on representative performance (i.e., performance 
based on normal operating conditions) of the affected source for the 
period being tested, according to the conditions detailed in paragraphs 
(b) through (i) of this section. Representative conditions exclude 
periods of startup and shutdown. You shall not conduct performance 
tests during periods of malfunction. You must record the process 
information that is necessary to document operating conditions during 
the test and include in such record an explanation to support that such 
conditions represent normal operation. Upon request, you shall make 
available to the Administrator such records as may be necessary to 
determine the conditions of performance tests.
    (b) * * *
    (1) Determine the concentration of particulate matter according to 
the following test methods:
    (i) Method 1 in appendix A-1 to part 60 of this chapter to select 
sampling port locations and the number of traverse points. Sampling 
ports must be located at the outlet of the control device and prior to 
any releases to the atmosphere.
    (ii) Method 2 or 2F in appendix A-1 to part 60 of this chapter or 
Method 2G in appendix A-2 to part 60 of this chapter to determine the 
volumetric flow rate of the stack gas.
    (iii) Method 3, 3A, or 3B in appendix A-2 to part 60 of this 
chapter to determine the dry molecular weight of the stack gas. The 
voluntary consensus standard ANSI/ASME PTC 19.10-1981--Part 10 
(incorporated by reference--see Sec.  63.14) may be used as an 
alternative to the manual procedures (but not instrumental procedures) 
in Method 3B.
    (iv) Method 4 in appendix A-3 to part 60 of this chapter to 
determine the moisture content of the stack gas.
    (v) Method 5 or 5D in appendix A-3 to part 60 of this chapter or 
Method 17 in appendix A-6 to part 60 of this chapter, as applicable, to 
determine the concentration of particulate matter (front half 
filterable catch only).
* * * * *
0
11. Section 63.7823 is amended by revising paragraphs (a), (c)(1), 
(d)(1)(i) through (iii), (d)(2)(i), and (e)(1) to read as follows:


Sec.  63.7823  What test methods and other procedures must I use to 
demonstrate initial compliance with the opacity limits?

    (a) You must conduct each performance test that applies to your 
affected source based on representative performance (i.e., performance 
based on normal operating conditions) of the affected source for the 
period being tested, according to the conditions detailed in paragraphs 
(b) through (d) of this section. Representative conditions exclude 
periods of startup and shutdown. You shall not conduct performance 
tests during periods of malfunction. You must record the process 
information that is necessary to document operating conditions during 
the test and include in such record an explanation to support that such 
conditions represent normal operation. Upon request, you shall make 
available to the Administrator such records as may be necessary to 
determine the conditions of performance tests.
* * * * *
    (c) * * *
    (1) Using a certified observer, determine the opacity of emissions 
according to Method 9 in appendix A-4 to part 60 of this chapter.
* * * * *
    (d) * * *
    (1) * * *
    (i) Using a certified observer, determine the opacity of emissions 
according to Method 9 in appendix A-4 to part 60 of this chapter except 
as specified in paragraphs (d)(1)(ii) and (iii) of this section.
    (ii) Instead of procedures in section 2.4 of Method 9 in appendix 
A-4 to part 60 of this chapter, record observations to the nearest 5 
percent at 15-second intervals for at least three steel production 
cycles.
    (iii) Instead of procedures in section 2.5 of Method 9 in appendix 
A-4 to part 60 of this chapter, determine the 3-minute block average 
opacity from the average of 12 consecutive observations recorded at 15-
second intervals.
    (2) * * *
    (i) Using a certified observer, determine the opacity of emissions 
according to Method 9 in appendix A-4 to part 60 of this chapter.
* * * * *
    (e) * * *
    (1) Using a certified observer, determine the opacity of emissions 
according to Method 9 in appendix A-4 to part 60 of this chapter.
* * * * *
0
12. Section 63.7824 is amended by revising the introductory text of 
paragraph (e), paragraphs (e)(1) and (2), and the defined term 
``Mc'' in Equation 1 in paragraph (e)(3) to read as follows:

[[Page 42743]]

Sec.  63.7824  What test methods and other procedures must I use to 
establish and demonstrate initial compliance with operating limits?

* * * * *
    (e) To demonstrate initial compliance with the alternative 
operating limit for volatile organic compound emissions from the sinter 
plant windbox exhaust stream in Sec.  63.7790(d)(2), follow the test 
methods and procedures in paragraphs (e)(1) through (5) of this 
section. You must conduct each performance test that applies to your 
affected source based on representative performance (i.e., performance 
based on normal operating conditions) of the affected source for the 
period being tested. Representative conditions exclude periods of 
startup and shutdown. You shall not conduct performance tests during 
periods of malfunction. You must record the process information that is 
necessary to document operating conditions during the test and include 
in such record an explanation to support that such conditions represent 
normal operation. Upon request, you shall make available to the 
Administrator such records as may be necessary to determine the 
conditions of performance tests.
    (1) Determine the volatile organic compound emissions according to 
the following test methods:
    (i) Method 1 in appendix A-1 to part 60 of this chapter to select 
sampling port locations and the number of traverse points. Sampling 
ports must be located at the outlet of the control device and prior to 
any releases to the atmosphere.
    (ii) Method 2 or 2F in appendix A-1 to part 60 of this chapter or 
Method 2G in appendix A-2 to part 60 of this chapter to determine the 
volumetric flow rate of the stack gas.
    (iii) Method 3, 3A, or 3B in appendix A-2 to part 60 of this 
chapter to determine the dry molecular weight of the stack gas. The 
voluntary consensus standard ANSI/ASME PTC 19.10-1981--Part 10 
(incorporated by reference--see Sec.  63.14) may be used as an 
alternative to the manual procedures (but not instrumental procedures) 
in Method 3B.
    (iv) Method 4 in appendix A-3 to part 60 of this chapter to 
determine the moisture content of the stack gas.
    (v) Method 25 in appendix A-7 to part 60 of this chapter to 
determine the mass concentration of volatile organic compound emissions 
(total gaseous nonmethane organics as carbon) from the sinter plant 
windbox exhaust stream stack.
    (2) Determine volatile organic compound (VOC) emissions every 24 
hours (from at least three samples taken at 8-hour intervals) using 
Method 25 in 40 CFR part 60, appendix A-7. Record the sampling date and 
time, sampling results, and sinter produced (tons/day).
    (3) * * *
    Mc = Average concentration of total gaseous nonmethane 
organics as carbon by Method 25 (40 CFR part 60, appendix A-7), 
milligrams per dry standard cubic meters (mg/dscm) for each day;
* * * * *
0
13. Sections 63.7825 and 63.7826 are redesignated as Sec. Sec.  63.7826 
and 63.7827, respectively, and a new Sec.  63.7825 is added to read as 
follows:


Sec.  63.7825  What test methods and other procedures must I use to 
demonstrate initial compliance with the emission limit for mercury?

    (a) If you choose to comply with the mercury emission limit for 
each BOPF Group in Table 1 to this subpart, you must conduct a 
performance test to demonstrate initial compliance with the emission 
limit. You must conduct each performance test that applies to your 
affected source based on representative performance (i.e., performance 
based on normal operating conditions) of the affected source for the 
period being tested, according to the conditions detailed in paragraphs 
(b) through (f) of this section. Representative conditions exclude 
periods of startup and shutdown. You shall not conduct performance 
tests during periods of malfunction.
    (1) You must record the process information that is necessary to 
document operating conditions during the test and include in such 
record an explanation to support that such conditions represent normal 
operation. Upon request, you shall make available to the Administrator 
such records as may be necessary to determine the conditions of 
performance tests.
    (2) For sources with multiple emission units ducted to a common 
control device and stack, compliance testing must be performed either 
by conducting a single compliance test with all affected emissions 
units in operation or by conducting a separate compliance test on each 
emissions unit. Alternatively, the owner or operator may request 
approval from the permit authority for an alternative testing approach. 
If the units are tested separately, any emissions unit that is not 
tested initially must be tested as soon as is practicable.
    (b) To determine compliance with the emission limit for mercury in 
Table 1 to this subpart, follow the test methods and procedures in 
paragraphs (b)(1) and (2) of this section.
    (1) Determine the concentration of mercury according to the 
following test methods:
    (i) Method 1 in appendix A-1 to part 60 of this chapter to select 
sampling port locations and the number of traverse points. Sampling 
ports must be located at the outlet of the control device and prior to 
any releases to the atmosphere.
    (ii) Method 2 or 2F in appendix A-1 to part 60 of this chapter or 
Method 2G in appendix A-2 to part 60 of this chapter to determine the 
volumetric flow rate of the stack gas.
    (iii) Method 3, 3A, or 3B in appendix A-2 to part 60 of this 
chapter to determine the dry molecular weight of the stack gas. The 
voluntary consensus standard ANSI/ASME PTC 19.10-1981--Part 10 
(incorporated by reference--see Sec.  63.14) may be used as an 
alternative to the manual procedures (but not instrumental procedures) 
in Method 3B.
    (iv) Method 4 in appendix A-3 to part 60 of this chapter to 
determine the moisture content of the stack gas.
    (v) Method 29 or 30B in appendix A-8 to part 60 of this chapter to 
determine the concentration of mercury from each unit of the BOPF Group 
exhaust stream stack.
    (2) Collect a minimum sample volume of 60 dscf of gas during each 
mercury test run. Three valid test runs are needed to comprise a 
performance test of each BOPF Group unit. If the emission testing 
results for any of the emission points yields a non-detect value, then 
the minimum detection limit (MDL) must be used to calculate the mass 
emissions (lb) for that emission unit and, in turn, for calculating the 
sum of the emissions (in units of pounds of mercury per ton of steel 
scrap) for all BOPF Group units subject to the emission standard for 
determining compliance. If the resulting mercury emissions are greater 
than the MACT emission standard, the owner or operator may use 
procedures that produce lower MDL results and repeat the mercury 
emissions testing one additional time for any emission point for which 
the measured result was below the MDL. If this additional testing is 
performed, the results from that testing must be used to determine 
compliance (i.e., there are no additional opportunities allowed to 
lower the MDL).
    (c) Calculate the mercury mass emissions, based on the average of 
three test run values, for each BOPF Group unit (or combination of 
units that are ducted to a common stack and are tested when all 
affected sources are operating pursuant to paragraph (a) of this 
section)

[[Page 42744]]

using Equation 1 of this section as follows:
[GRAPHIC] [TIFF OMITTED] TP16AU19.247

Where:

E = Mass emissions of mercury, pounds (lb);
Cs = Concentration of mercury in stack gas, gr/dscf;
Vmstd = Standard meter volume, dscf; and
K = Conversion factor, 7,000 gr/lb.

    (d) You must install, calibrate, maintain and operate an 
appropriate weight measurement device, to measure the tons of steel 
scrap input to the BOPF cycle simultaneous with each BOPF Group unit's 
stack test.
    (e) You must maintain the systems for measuring weight within 
5 percent accuracy. You must describe the specific 
equipment used to make measurements at your facility and how that 
equipment is periodically calibrated. You must also explain, document, 
and maintain written procedures for determining the accuracy of the 
measurements and make these written procedures available to your 
permitting authority upon request. You must determine, record, and 
maintain a record of the accuracy of the measuring systems before the 
beginning of your initial compliance test and during each subsequent 
quarter of affected source operation.
    (f) Calculate the emissions from each new and existing affected 
source in pounds of mercury per ton of steel scrap to determine initial 
compliance with the mercury emission limit in Table 1. Sum the mercury 
mass emissions (in pounds) from all BOPF Group units calculated using 
Equation 1 of this section. Divide that sum by the sum of the total 
amount of steel scrap charged to the BOPFs (in tons).
0
14. Section 63.7831 is amended by revising paragraph (f)(4) to read as 
follows:


Sec.  63.7831  What are the installation, operation, and maintenance 
requirements for my monitors?

* * * * *
    (f) * * *
    (4) Each system that works based on the triboelectric effect must 
be installed, operated, and maintained in a manner consistent with the 
guidance document, ``Fabric Filter Bag Leak Detection Guidance,'' EPA-
454/R-98-015, September 1997 (incorporated by reference, see Sec.  
63.14). You may install, operate, and maintain other types of bag leak 
detection systems in a manner consistent with the manufacturer's 
written specifications and recommendations.
* * * * *
0
15. Section 63.7833 is amended by revising paragraph (g)(3) and adding 
paragraphs (h) and (i) to read as follows:


Sec.  63.7833  How do I demonstrate continuous compliance with the 
emission limitations that apply to me?

* * * * *
    (g) * * *
    (3) For purposes of paragraphs (g)(1) and (2) of this section, in 
the case of an exceedance of the hourly average opacity operating limit 
for an electrostatic precipitator, measurements of the hourly average 
opacity based on visible emission observations in accordance with 
Method 9 (40 CFR part 60, appendix A-4) may be taken to evaluate the 
effectiveness of corrective action.
* * * * *
    (h) If you choose to comply with Sec.  63.7791 by complying with 
the mercury emissions limits in Table 1 for BOPF Groups, you must 
conduct annual mercury performance tests in accordance with Sec.  
63.7821(e) and calculate the emissions from each new and existing 
affected source in pounds of mercury per ton of steel scrap to 
determine annual compliance with the mercury emission limits in Table 
1. Sum the mercury mass emissions (in pounds) from all BOPF Group units 
calculated using Equation 1 of Sec.  63.7825. Divide that sum by the 
sum of the total amount of steel scrap charged to the BOPFs (in tons).
    (i) If you choose to comply with Sec.  63.7791 by using the NVMSRP 
or another EPA- approved mercury program, or by using scrap not likely 
to contain mercury, you must obtain and certify the use of steel scrap 
per Sec.  63.7791(a), (b), or (c), as applicable, to demonstrate 
continuous compliance with the standard.
0
16. Section 63.7835 is revised to read as follows:


Sec.  63.7835  What other requirements must I meet to demonstrate 
continuous compliance?

    Except as provided in Sec.  63.7833(g), you must report each 
instance in which you did not meet each emission limitation in Sec.  
63.7790 that applies to you. This includes periods of startup, 
shutdown, and malfunction. You also must report each instance in which 
you did not meet each operation and maintenance requirement in Sec.  
63.7800 that applies to you. These instances are deviations from the 
emission limitations and operation and maintenance requirements in this 
subpart. These deviations must be reported according to the 
requirements in Sec.  63.7841.
    (a) In the event that an affected unit fails to meet an applicable 
standard, record the number of failures. For each failure, record the 
date, time and duration of each failure.
    (b) For each failure to meet an applicable standard, record and 
retain a list of the affected sources or equipment, an estimate of the 
quantity of each regulated pollutant emitted over any emission limit 
and a description of the method used to estimate the emissions.
    (c) Record actions taken to minimize emissions in accordance with 
Sec.  63.7810(c), and any corrective actions taken to return the 
affected unit to its normal or usual manner of operation.
0
17. Section 63.7840 is amended by revising paragraph (e)(2) and adding 
paragraphs (f) through (h) to read as follows:


Sec.  63.7840  What notifications must I submit and when?

* * * * *
    (e) * * *
    (2) For each initial compliance demonstration that includes a 
performance test, you must submit the notification of compliance 
status, including the summary of performance test results, before the 
close of business on the 60th calendar day following the completion of 
the performance test according to Sec.  63.10(d)(2).
    (f) The notification of compliance status required by Sec.  63.9(h) 
must include each applicable certification of compliance, signed by a 
responsible official, in paragraphs (f)(1) and (2) of this section, 
regarding the mercury requirements in Sec.  63.7791.
    (1) ``This facility participates in and purchases scrap only from 
scrap providers who participate in a program for removal of mercury 
switches that has been approved by the EPA Administrator and has 
prepared a plan demonstrating how the facility participates in the EPA-
approved program, in accordance with Sec.  63.7791(a)(4) or (c)(4)''; 
or
    (2) ``This facility complies with the requirements for scrap that 
is not likely to contain motor vehicle scrap, in accordance with Sec.  
63.7791(b).''
    (g) Within 60 calendar days after the date of completing each 
performance test required by this subpart, you must submit the results 
of the performance test following the procedures specified in 
paragraphs (g)(1) through (3) of this section. Where applicable, you 
may assert a claim of EPA system outage, in accordance with Sec.  
63.7841(e), or force majeure, in accordance with

[[Page 42745]]

Sec.  63.7841(f), for failure to timely comply with this requirement.
    (1) Data collected using test methods supported by EPA's Electronic 
Reporting Tool (ERT) as listed on EPA's ERT website (https://www.epa.gov/electronic-reporting-air-emissions/electronic-reporting-tool-ert) at the time of the test. Submit the results of the 
performance test to the EPA via the Compliance and Emissions Data 
Reporting Interface (CEDRI), which can be accessed through EPA's 
Central Data Exchange (CDX) (https://cdx.epa.gov/). The data must be 
submitted in a file format generated through the use of EPA's ERT. 
Alternatively, you may submit an electronic file consistent with the 
extensible markup language (XML) schema listed on EPA's ERT website.
    (2) Data collected using test methods that are not supported by 
EPA's ERT as listed on EPA's ERT website at the time of the test. The 
results of the performance test must be included as an attachment in 
the ERT or an alternate electronic file consistent with the XML schema 
listed on EPA's ERT website. Submit the ERT generated package or 
alternative file to the EPA via CEDRI.
    (3) Confidential business information (CBI). If you claim some of 
the information submitted under paragraph (g) of this section is CBI, 
you must submit a complete file, including information claimed to be 
CBI, to the EPA. The file must be generated through the use of EPA's 
ERT or an alternate electronic file consistent with the XML schema 
listed on EPA's ERT website. Submit the file on a compact disc, flash 
drive, or other commonly used electronic storage medium and clearly 
mark the medium as CBI. Mail the electronic medium to U.S. EPA/OAQPS/
CORE CBI Office, Attention: Group Leader, Measurement Policy Group, MD 
C404-02, 4930 Old Page Rd., Durham, NC 27703. The same file with the 
CBI omitted must be submitted to the EPA via EPA's CDX as described in 
paragraph (g) of this section.
    (h) Within 60 calendar days after the date of completing each 
continuous monitoring system (CMS) performance evaluation (as defined 
in Sec.  63.2), you must submit the results of the performance 
evaluation following the procedures specified in paragraphs (h)(1) 
through (3) of this section. Where applicable, you may assert a claim 
of EPA system outage, in accordance with Sec.  63.7841(e), or force 
majeure, in accordance with Sec.  63.7841(f), for failure to timely 
comply with this requirement.
    (1) Performance evaluations of CMS measuring relative accuracy test 
audit (RATA) pollutants that are supported by EPA's ERT as listed on 
EPA's ERT website at the time of the evaluation. Submit the results of 
the performance evaluation to the EPA via CEDRI, which can be accessed 
through EPA's CDX. The data must be submitted in a file format 
generated through the use of EPA's ERT. Alternatively, you may submit 
an electronic file consistent with the XML schema listed on EPA's ERT 
website.
    (2) Performance evaluations of CMS measuring RATA pollutants that 
are not supported by EPA's ERT as listed on EPA's ERT website at the 
time of the evaluation. The results of the performance evaluation must 
be included as an attachment in the ERT or an alternate electronic file 
consistent with the XML schema listed on EPA's ERT website. Submit the 
ERT generated package or alternative file to the EPA via CEDRI.
    (3) Confidential business information (CBI). If you claim some of 
the information submitted under paragraph (h) of this section is CBI, 
you must submit a complete file, including information claimed to be 
CBI, to the EPA. The file must be generated through the use of EPA's 
ERT or an alternate electronic file consistent with the XML schema 
listed on EPA's ERT website. Submit the file on a compact disc, flash 
drive, or other commonly used electronic storage medium and clearly 
mark the medium as CBI. Mail the electronic medium to U.S. EPA/OAQPS/
CORE CBI Office, Attention: Group Leader, Measurement Policy Group, MD 
C404-02, 4930 Old Page Rd., Durham, NC 27703. The same file with the 
CBI omitted must be submitted to the EPA via EPA's CDX as described in 
paragraph (h) of this section.
0
18. Section 63.7841 is amended by:
0
a. Revising the introductory text of paragraph (b), paragraph (b)(4), 
the introductory text of paragraph (b)(8), and paragraphs (b)(8)(iv) 
and (vi);
0
b. Adding paragraphs (b)(9) and (10);
0
c. Revising paragraph (c);
0
d. Redesignating paragraph (d) as paragraph (g) and revising the newly 
redesignated paragraph; and
0
e. Adding new paragraphs (d) through (f).
    The revisions and additions read as follows:


Sec.  63.7841  What reports must I submit and when?

* * * * *
    (b) Compliance report contents. Each compliance report must include 
the information in paragraphs (b)(1) through (3) of this section and, 
as applicable, paragraphs (b)(4) through (10) of this section.
* * * * *
    (4) If you failed to meet an applicable standard, the compliance 
report must include the number of failures to meet an applicable 
standard and the date, time and duration of each failure. For each 
failure, the compliance report must include a list of the affected 
sources or equipment, an estimate of the quantity of each regulated 
pollutant emitted over any emission limit, and a description of the 
method used to estimate the emissions.
* * * * *
    (8) For each deviation from an emission limitation occurring at an 
affected source where you are using a continuous monitoring system 
(including a CPMS or COMS) to comply with the emission limitation in 
this subpart, you must include the information in paragraphs (b)(1) 
through (4) of this section and the information in paragraphs (b)(8)(i) 
through (xi) of this section. This includes periods of malfunction.
* * * * *
    (iv) The date and time that each deviation started and stopped, and 
whether each deviation occurred during a malfunction or during another 
period.
* * * * *
    (vi) A breakdown of the total duration of the deviations during the 
reporting period including those that are due to control equipment 
problems, process problems, other known causes, and other unknown 
causes.
* * * * *
    (9) Any deviation from the requirements in Sec.  63.7791(a) and the 
corrective action taken.
    (10) If there were no deviations from the requirements in Sec.  
63.7791(a), a statement that there were no deviations from the 
requirements during the reporting period.
    (c) Beginning on [date 6 months after date of publication of final 
rule in the Federal Register], submit all subsequent reports following 
the procedure specified in paragraph (d) of this section.
    (d) If you are required to submit reports following the procedure 
specified in this paragraph, you must submit reports to the EPA via 
CEDRI, which can be accessed through EPA's CDX (https://cdx.epa.gov/). 
You must use the appropriate electronic report template on the CEDRI 
website (https://www.epa.gov/electronic-reporting-air-emissions/compliance-and-emissions-data-reporting-interface-cedri) for this 
subpart. The date report templates become available will be listed on 
the CEDRI website. The report must be submitted by the deadline 
specified in this subpart, regardless of the method in

[[Page 42746]]

which the report is submitted. If you claim some of the information 
required to be submitted via CEDRI is CBI, submit a complete report, 
including information claimed to be CBI, to the EPA. The report must be 
generated using the appropriate form on the CEDRI website. Submit the 
file on a compact disc, flash drive, or other commonly used electronic 
storage medium and clearly mark the medium as CBI. Mail the electronic 
medium to U.S. EPA/OAQPS/CORE CBI Office, Attention: Group Leader, 
Measurement Policy Group, MD C404-02, 4930 Old Page Rd., Durham, NC 
27703. The same file with the CBI omitted must be submitted to the EPA 
via EPA's CDX as described earlier in this paragraph.
    (e) If you are required to electronically submit a report through 
CEDRI in EPA's CDX, you may assert a claim of EPA system outage for 
failure to timely comply with the reporting requirement. To assert a 
claim of EPA system outage, you must meet the requirements outlined in 
paragraphs (e)(1) through (7) of this section.
    (1) You must have been or will be precluded from accessing CEDRI 
and submitting a required report within the time prescribed due to an 
outage of either EPA's CEDRI or CDX systems.
    (2) The outage must have occurred within the period of time 
beginning five business days prior to the date that the submission is 
due.
    (3) The outage may be planned or unplanned.
    (4) You must submit notification to the Administrator in writing as 
soon as possible following the date you first knew, or through due 
diligence should have known, that the event may cause or has caused a 
delay in reporting.
    (5) You must provide to the Administrator a written description 
identifying:
    (i) The date(s) and time(s) when CDX or CEDRI was accessed and the 
system was unavailable;
    (ii) A rationale for attributing the delay in reporting beyond the 
regulatory deadline to EPA system outage;
    (iii) Measures taken or to be taken to minimize the delay in 
reporting; and
    (iv) The date by which you propose to report, or if you have 
already met the reporting requirement at the time of the notification, 
the date you reported.
    (6) The decision to accept the claim of EPA system outage and allow 
an extension to the reporting deadline is solely within the discretion 
of the Administrator.
    (7) In any circumstance, the report must be submitted 
electronically as soon as possible after the outage is resolved.
    (f) If you are required to electronically submit a report through 
CEDRI in EPA's CDX, you may assert a claim of force majeure for failure 
to timely comply with the reporting requirement. To assert a claim of 
force majeure, you must meet the requirements outlined in paragraphs 
(f)(1) through (5) of this section.
    (1) You may submit a claim if a force majeure event is about to 
occur, occurs, or has occurred or there are lingering effects from such 
an event within the period of time beginning five business days prior 
to the date the submission is due. For the purposes of this section, a 
force majeure event is defined as an event that will be or has been 
caused by circumstances beyond the control of the affected facility, 
its contractors, or any entity controlled by the affected facility that 
prevents you from complying with the requirement to submit a report 
electronically within the time period prescribed. Examples of such 
events are acts of nature (e.g., hurricanes, earthquakes, or floods), 
acts of war or terrorism, or equipment failure or safety hazard beyond 
the control of the affected facility (e.g., large scale power outage).
    (2) You must submit notification to the Administrator in writing as 
soon as possible following the date you first knew, or through due 
diligence should have known, that the event may cause or has caused a 
delay in reporting.
    (3) You must provide to the Administrator:
    (i) A written description of the force majeure event;
    (ii) A rationale for attributing the delay in reporting beyond the 
regulatory deadline to the force majeure event;
    (iii) Measures taken or to be taken to minimize the delay in 
reporting; and
    (iv) The date by which you propose to report, or if you have 
already met the reporting requirement at the time of the notification, 
the date you reported.
    (4) The decision to accept the claim of force majeure and allow an 
extension to the reporting deadline is solely within the discretion of 
the Administrator.
    (5) In any circumstance, the reporting must occur as soon as 
possible after the force majeure event occurs.
    (g) Part 70 monitoring report. If you have obtained a title V 
operating permit for an affected source pursuant to 40 CFR part 70 or 
71, you must report all deviations as defined in this subpart in the 
semiannual monitoring report required by 40 CFR 70.6(a)(3)(iii)(A) or 
40 CFR 71.6(a)(3)(iii)(A). If you submit a compliance report for an 
affected source along with, or as part of, the semiannual monitoring 
report required by 40 CFR 70.6(a)(3)(iii)(A) or 40 CFR 
71.6(a)(3)(iii)(A), and the compliance report includes all the required 
information concerning deviations from any emission limitation, 
standard, or operation and maintenance requirement in this subpart, 
submission of the compliance report satisfies any obligation to report 
the same deviations in the semiannual monitoring report. However, 
submission of a compliance report does not otherwise affect any 
obligation you may have to report deviations from permit requirements 
for an affected source to your permitting authority.
0
19. Section 63.7842 is amended by:
0
a. Revising paragraph (a)(2);
0
b. Redesignating paragraph (a)(3) as paragraph (a)(5);
0
c. Adding new paragraphs (a)(3) and (a)(4);
0
d. Revising paragraph (b)(3); and
0
e. Adding paragraph (e).
    The revisions and additions read as follows:


Sec.  63.7842  What records must I keep?

    (a) * * *
    (2) Records of the date, time and duration of each failure to meet 
an applicable standard.
    (3) For each failure to meet an applicable standard, a list of the 
affected sources or equipment, an estimate of the quantity of each 
regulated pollutant emitted over any emission limit, and a description 
of the method used to estimate the emissions.
    (4) Records of the actions taken to minimize emissions in 
accordance with Sec.  63.7810(c), and any corrective actions taken to 
return the affected unit to its normal or usual manner of operation.
* * * * *
    (b) * * *
    (3) Previous (that is, superseded) versions of the performance 
evaluation plan required under Sec.  63.8(d)(2), with the program of 
corrective action included in the plan.
* * * * *
    (e) You must keep records to demonstrate compliance with the 
requirements for mercury in Sec.  63.7791(a) as applicable. You must 
keep records documenting compliance with Sec.  63.7791(b) for scrap not 
likely to contain motor vehicle scrap. If you are subject to the 
requirements for an approved mercury program under Sec.  63.7791(a), 
you must maintain records identifying each scrap provider and 
documenting the scrap provider's participation in an approved mercury 
switch removal program. If you purchase scrap from a broker, you must 
maintain records identifying each

[[Page 42747]]

broker and documentation that all scrap provided by the broker was 
obtained from other scrap providers who participate in an approved 
mercury switch removal program.
0
20. Section 63.7843 is amended by adding paragraph (d) to read as 
follows:


Sec.  63.7843  In what form and how long must I keep my records?

* * * * *
    (d) Any records required to be maintained by this part that are 
submitted electronically via EPA's CEDRI may be maintained in 
electronic format. This ability to maintain electronic copies does not 
affect the requirement for facilities to make records, data, and 
reports available upon request to a delegated air agency or the EPA as 
part of an on-site compliance evaluation.
0
21. Section 63.7851 is amended by revising the introductory text of 
paragraph (c) and adding paragraph (c)(5) to read as follows:


Sec.  63.7851  Who implements and enforces this subpart?

* * * * *
    (c) The authorities that will not be delegated to State, local, or 
tribal agencies are specified in paragraphs (c)(1) through (5) of this 
section.
* * * * *
    (5) Approval of an alternative to any electronic reporting to the 
EPA required by this subpart.
0
22. Section 63.7852 is amended by revising paragraph (1) under the 
definition of ``deviation'' and adding, in alphabetical order, 
definitions for ``basic oxygen process furnace group,'' ``mercury 
switch,'' ``motor vehicle,'' ``motor vehicle scrap,'' ``opening,'' 
``post-consumer steel scrap,'' ``pre-consumer steel scrap,'' ``scrap 
provider,'' and ``steel scrap.''


Sec.  63.7852  What definitions apply to this subpart?

* * * * *
    Basic oxygen process furnace group means the collection of BOPF 
shop steelmaking operation units including the BOPF primary units (BOPF 
emissions from oxygen blow iron refining), BOPF secondary units 
(secondary fugitive emissions in the shop from iron charging, tapping, 
and auxiliary processes not elsewhere controlled), ladle metallurgy 
units, and hot metal transfer, desulfurization and slag skimming units.
* * * * *
    Deviation means any instance in which an affected source subject to 
this subpart, or an owner or operator of such a source:
    (1) Fails to meet any requirement or obligation established by this 
subpart, including but not limited to any emission limitation 
(including operating limits), standard, or operation and maintenance 
requirement;
* * * * *
    Mercury switch means each mercury-containing capsule or switch 
assembly that is part of a convenience light switch mechanism installed 
in a motor vehicle.
    Motor vehicle means an automotive vehicle not operated on rails and 
usually operated with rubber tires for use on highways.
    Motor vehicle scrap means post-consumer scrap from discarded 
vehicles or automobile bodies, including automobile body hulks that 
have been processed through a shredder. Motor vehicle scrap does not 
include automobile manufacturing bundles or miscellaneous vehicle 
parts, such as wheels, bumpers or other components that do not contain 
mercury switches. Motor vehicle scrap typically is not sold separately 
but is combined with other steel scrap for sale.
    Opening means any roof monitor, vent, door, window, hole, crack or 
other conduit that allows gas to escape to the atmosphere from a BF 
casthouse or BOPF shop.
    Post-consumer steel scrap means steel scrap that is composed of 
materials made of steel that were purchased by households or by 
commercial, industrial, and institutional facilities in their role as 
end-users of the product and which can no longer be used for its 
intended purpose.
    Pre-consumer steel scrap means steel scrap that is left over from 
industrial or manufacturing processes and which is subsequently 
recycled as scrap. Other terms used to describe this scrap are new, 
home, run-around, prompt-industrial, and return scrap.
* * * * *
    Scrap provider means the company or person (including a broker) who 
contracts directly with a steel mill to provide steel scrap. Scrap 
processors such as shredder operators or vehicle dismantlers that do 
not sell scrap directly to a steel mill are not scrap providers.
* * * * *
    Steel scrap means pre-consumer and post-consumer discarded steel 
that is processed by scrap providers for resale (post-consumer) or used 
on-site (pre-consumer or run-around scrap from within a facility or 
company). Post-consumer steel scrap may or may not contain motor 
vehicle scrap, depending on the type of scrap. In regard to motor 
vehicle scrap, steel scrap only can be classified as ``scrap that is 
likely to contain motor vehicle scrap'' vs. ``scrap that is not likely 
to contain motor vehicle scrap,'' as determined by the scrap provider.
* * * * *
0
23. Table 1 to Subpart FFFFF of Part 63 is revised to read as follows:

    Table 1 to Subpart FFFFF of Part 63--Emission and Opacity Limits
 As required in Sec.   63.7790(a), you must comply with each applicable
           emission and opacity limit in the following table:
------------------------------------------------------------------------
                                      You must comply with each of the
             For . . .                         following . . .
------------------------------------------------------------------------
1. Each windbox exhaust stream at   You must not cause to be discharged
 an existing sinter plant.           to the atmosphere any gases that
                                     contain particulate matter in
                                     excess of 0.4 lb/ton of product
                                     sinter.
2. Each windbox exhaust stream at   You must not cause to be discharged
 a new sinter plant.                 to the atmosphere any gases that
                                     contain particulate matter in
                                     excess of 0.3 lb/ton of product
                                     sinter.
3. Each discharge end at an         a. You must not cause to be
 existing sinter plant.              discharged to the atmosphere any
                                     gases that exit from one or more
                                     control devices that contain, on a
                                     flow-weighted basis, particulate
                                     matter in excess of 0.02 gr/dscf;
                                     \12\ and
                                    b. You must not cause to be
                                     discharged to the atmosphere any
                                     secondary emissions that exit any
                                     opening in the building or
                                     structure housing the discharge end
                                     that exhibit opacity greater than
                                     20 percent (6-minute average).
4. Each discharge end at a new      a. You must not cause to be
 sinter plant.                       discharged to the atmosphere any
                                     gases that exit from one or more
                                     control devices that contain, on a
                                     flow weighted basis, particulate
                                     matter in excess of 0.01 gr/dscf;
                                     and
                                    b. You must not cause to be
                                     discharged to the atmosphere any
                                     secondary emissions that exit any
                                     opening in the building or
                                     structure housing the discharge end
                                     that exhibit opacity greater than
                                     10 percent (6-minute average).

[[Page 42748]]

 
5. Each sinter cooler at an         You must not cause to be discharged
 existing sinter plant.              to the atmosphere any emissions
                                     that exhibit opacity greater than
                                     10 percent (6-minute average).
6. Each sinter cooler at a new      You must not cause to be discharged
 sinter plant.                       to the atmosphere any gases that
                                     contain particulate matter in
                                     excess of 0.01 gr/dscf.
7. Each casthouse at an existing    a. You must not cause to be
 blast furnace.                      discharged to the atmosphere any
                                     gases that exit from a control
                                     device that contain particulate
                                     matter in excess of 0.01 gr/dscf;
                                     \2\ and
                                    b. You must not cause to be
                                     discharged to the atmosphere any
                                     secondary emissions that exit all
                                     openings in the casthouse or
                                     structure housing the blast furnace
                                     that exhibit opacity greater than
                                     20 percent (6-minute average).
8. Each casthouse at a new blast    a. You must not cause to be
 furnace.                            discharged to the atmosphere any
                                     gases that exit from a control
                                     device that contain particulate
                                     matter in excess of 0.003 gr/dscf;
                                     and
                                    b. You must not cause to be
                                     discharged to the atmosphere any
                                     secondary emissions that exit all
                                     openings in the casthouse or
                                     structure housing the blast furnace
                                     that exhibit opacity greater than
                                     15 percent (6-minute average).
9. Each BOPF at a new or existing   a. You must not cause to be
 shop.                               discharged to the atmosphere any
                                     gases that exit from a primary
                                     emission control system for a BOPF
                                     with a closed hood system at a new
                                     or existing BOPF shop that contain,
                                     on a flow-weighted basis,
                                     particulate matter in excess of
                                     0.03 gr/dscf during the primary
                                     oxygen blow; \23\ and
                                    b. You must not cause to be
                                     discharged to the atmosphere any
                                     gases that exit from a primary
                                     emission control system for a BOPF
                                     with an open hood system that
                                     contain, on a flow-weighted basis,
                                     particulate matter in excess of
                                     0.02 gr/dscf during the steel
                                     production cycle for an existing
                                     BOPF shop \23\ or 0.01 gr/dscf
                                     during the steel production cycle
                                     for a new BOPF shop; \3\ and
                                    c. You must not cause to be
                                     discharged to the atmosphere any
                                     gases that exit from a control
                                     device used solely for the
                                     collection of secondary emissions
                                     from the BOPF that contain
                                     particulate matter in excess of
                                     0.01 gr/dscf for an existing BOPF
                                     shop \2\ or 0.0052 gr/dscf for a
                                     new BOPF shop.
10. Each hot metal transfer,        You must not cause to be discharged
 skimming, and desulfurization       to the atmosphere any gases that
 operation at a new or existing      exit from a control device that
 BOPF shop.                          contain particulate matter in
                                     excess of 0.01 gr/dscf for an
                                     existing BOPF shop \2\ or 0.003 gr/
                                     dscf for a new BOPF shop.
11. Each ladle metallurgy           You must not cause to be discharged
 operation at a new or existing      to the atmosphere any gases that
 BOPF shop.                          exit from a control device that
                                     contain particulate matter in
                                     excess of 0.01 gr/dscf for an
                                     existing BOPF shop \2\ or 0.004 gr/
                                     dscf for a new BOPF shop.
12. Each existing BOPF shop.......  You must not cause to be discharged
                                     to the atmosphere any secondary
                                     emissions that exit any opening in
                                     the BOPF shop or any other building
                                     housing the BOPF or BOPF shop
                                     operation that exhibit opacity
                                     greater than 20 percent (3-minute
                                     average).
13. Each new BOPF shop............  a. You must not cause to be
                                     discharged to the atmosphere any
                                     secondary emissions that exit any
                                     opening in the BOPF shop or other
                                     building housing a bottom-blown
                                     BOPF or BOPF shop operations that
                                     exhibit opacity (for any set of 6-
                                     minute averages) greater than 10
                                     percent, except that one 6-minute
                                     period not to exceed 20 percent may
                                     occur once per steel production
                                     cycle; or
                                    b. You must not cause to be
                                     discharged to the atmosphere any
                                     secondary emissions that exit any
                                     opening in the BOPF shop or other
                                     building housing a top-blown BOPF
                                     or BOPF shop operations that
                                     exhibit opacity (for any set of 3-
                                     minute averages) greater than 10
                                     percent, except that one 3-minute
                                     period greater than 10 percent but
                                     less than 20 percent may occur once
                                     per steel production cycle.
14. Each BOPF Group at an existing  You must not cause to be discharged
 BOPF shop.                          to the atmosphere any gases that
                                     exit from the collection of BOPF
                                     Group control devices that contain
                                     mercury in excess of 0.00026 lb/ton
                                     of steel scrap input to the BOPF.
15. Each BOPF Group at a new BOPF   You must not cause to be discharged
 shop.                               to the atmosphere any gases that
                                     exit from the collection of BOPF
                                     Group control devices that contain
                                     mercury in excess of 0.00008 lb/ton
                                     of steel scrap input to the BOPF.
------------------------------------------------------------------------
\1\ This limit applies if the cooler is vented to the same control
  device as the discharge end.
\2\ This concentration limit (gr/dscf) for a control device does not
  apply to discharges inside a building or structure housing the
  discharge end at an existing sinter plant, inside a casthouse at an
  existing blast furnace, or inside an existing BOPF shop if the control
  device was installed before August 30, 2005.
\3\ This limit applies to control devices operated in parallel for a
  single BOPF during the oxygen blow.

0
24. Table 2 to Subpart FFFFF of Part 63 is revised to read as follows:

  Table 2 to Subpart FFFFF of Part 63--Initial Compliance With Emission
                           and Opacity Limits
    As required in Sec.   63.7826(a)(1), you must demonstrate initial
    compliance with the emission and opacity limits according to the
                            following table:
------------------------------------------------------------------------
                                        You have demonstrated initial
             For . . .                       compliance if . . .
------------------------------------------------------------------------
1. Each windbox exhaust stream at   The process-weighted mass rate of
 an existing sinter plant.           particulate matter from a windbox
                                     exhaust stream, measured according
                                     to the performance test procedures
                                     in Sec.   63.7822(c), did not
                                     exceed 0.4 lb/ton of product
                                     sinter.
2. Each windbox exhaust stream at   The process-weighted mass rate of
 a new sinter plant.                 particulate matter from a windbox
                                     exhaust stream, measured according
                                     to the performance test procedures
                                     in Sec.   63.7822(c), did not
                                     exceed 0.3 lb/ton of product
                                     sinter.
3. Each discharge end at an         a. The flow-weighted average
 existing sinter plant.              concentration of particulate matter
                                     from one or more control devices
                                     applied to emissions from a
                                     discharge end, measured according
                                     to the performance test procedures
                                     in Sec.   63.7822(d), did not
                                     exceed 0.02 gr/dscf; and

[[Page 42749]]

 
                                    b. The opacity of secondary
                                     emissions from each discharge end,
                                     determined according to the
                                     performance test procedures in Sec.
                                       63.7823(c), did not exceed 20
                                     percent (6-minute average).
4. Each discharge end at a new      a. The flow-weighted average
 sinter plant.                       concentration of particulate matter
                                     from one or more control devices
                                     applied to emissions from a
                                     discharge end, measured according
                                     to the performance test procedures
                                     in Sec.   63.7822(d), did not
                                     exceed 0.01 gr/dscf; and
                                    b. The opacity of secondary
                                     emissions from each discharge end,
                                     determined according to the
                                     performance test procedures in Sec.
                                       63.7823(c), did not exceed 10
                                     percent (6-minute average).
5. Each sinter cooler at an         The opacity of emissions, determined
 existing sinter plant.              according to the performance test
                                     procedures in Sec.   63.7823(e),
                                     did not exceed 10 percent (6-minute
                                     average).
6. Each sinter cooler at a new      The average concentration of
 sinter plant.                       particulate matter, measured
                                     according to the performance test
                                     procedures in Sec.   63.7822(b),
                                     did not exceed 0.01 gr/dscf.
7. Each casthouse at an existing    a. The average concentration of
 blast furnace.                      particulate matter from a control
                                     device applied to emissions from a
                                     casthouse, measured according to
                                     the performance test procedures in
                                     Sec.   63.7822(e), did not exceed
                                     0.01 gr/dscf; and
                                    b. The opacity of secondary
                                     emissions from each casthouse,
                                     determined according to the
                                     performance test procedures in Sec.
                                       63.7823(c), did not exceed 20
                                     percent (6-minute average).
8. Each casthouse at a new blast    a. The average concentration of
 furnace.                            particulate matter from a control
                                     device applied to emissions from a
                                     casthouse, measured according to
                                     the performance test procedures in
                                     Sec.   63.7822(e), did not exceed
                                     0.003 gr/dscf; and
                                    b. The opacity of secondary
                                     emissions from each casthouse,
                                     determined according to the
                                     performance test procedures in Sec.
                                       63.7823(c), did not exceed 15
                                     percent (6-minute average).
9. Each BOPF at a new or existing   a. The average concentration of
 BOPF shop.                          particulate matter from a primary
                                     emission control system applied to
                                     emissions from a BOPF with a closed
                                     hood system, measured according to
                                     the performance test procedures in
                                     Sec.   63.7822(f), did not exceed
                                     0.03 gr/dscf for a new or existing
                                     BOPF shop;
                                    b. The average concentration of
                                     particulate matter from a primary
                                     emission control system applied to
                                     emissions from a BOPF with an open
                                     hood system, measured according to
                                     the performance test procedures in
                                     Sec.   63.7822(g), did not exceed
                                     0.02 gr/dscf for an existing BOPF
                                     shop or 0.01 gr/dscf for a new BOPF
                                     shop; and
                                    c. The average concentration of
                                     particulate matter from a control
                                     device applied solely to secondary
                                     emissions from a BOPF, measured
                                     according to the performance test
                                     procedures in Sec.   63.7822(g),
                                     did not exceed 0.01 gr/dscf for an
                                     existing BOPF shop or 0.0052 gr/
                                     dscf for a new BOPF shop.
10. Each hot metal transfer         The average concentration of
 skimming, and desulfurization at    particulate matter from a control
 a new or existing BOPF shop.        device applied to emissions from
                                     hot metal transfer, skimming, or
                                     desulfurization, measured according
                                     to the performance test procedures
                                     in Sec.   63.7822(h), did not
                                     exceed 0.01 gr/dscf for an existing
                                     BOPF shop or 0.003 gr/dscf for a
                                     new BOPF shop.
11. Each ladle metallurgy           The average concentration of
 operation at a new or existing      particulate matter from a control
 BOPF shop.                          device applied to emissions from a
                                     ladle metallurgy operation,
                                     measured according to the
                                     performance test procedures in Sec.
                                       63.7822(h), did not exceed 0.01
                                     gr/dscf for an existing BOPF shop
                                     or 0.004 gr/dscf for a new BOPF
                                     shop.
12. Each existing BOPF shop.......  The opacity of secondary emissions
                                     from each BOPF shop, determined
                                     according to the performance test
                                     procedures in Sec.   63.7823(d),
                                     did not exceed 20 percent (3-minute
                                     average).
13. Each new BOPF shop............  a. The opacity of the highest set of
                                     6-minute averages from each BOPF
                                     shop housing a bottom-blown BOPF,
                                     determined according to the
                                     performance test procedures in Sec.
                                       63.7823(d), did not exceed 20
                                     percent and the second highest set
                                     of 6-minute averages did not exceed
                                     10 percent; or
                                    b. The opacity of the highest set of
                                     3-minute averages from each BOPF
                                     shop housing a top-blown BOPF,
                                     determined according to the
                                     performance test procedures in Sec.
                                       63.7823(d), did not exceed 20
                                     percent and the second highest set
                                     of 3-minute averages did not exceed
                                     10 percent.
14. Each BOPF Group at an existing  The average emissions of mercury
 BOPF shop.                          from the collection of BOPF Group
                                     control devices applied to the
                                     emissions from the BOPF Group,
                                     measured according to the
                                     performance test procedures in Sec.
                                       63.7825, did not exceed 0.00026
                                     lb/ton steel scrap input to the
                                     BOPF.
15. Each BOPF Group at a new BOPF   The average emissions of mercury
 shop.                               from the collection of BOPF Group
                                     control devices applied to the
                                     emissions from the BOPF Group,
                                     measured according to the
                                     performance test procedures in Sec.
                                       63.7825, did not exceed 0.00008
                                     lb/ton steel scrap input to the
                                     BOPF.
------------------------------------------------------------------------

0
25. Table 3 to Subpart FFFFF of Part 63 is revised to read as follows:

Table 3 to Subpart FFFFF of Part 63--Continuous Compliance With Emission
                           and Opacity Limits
    As required in Sec.   63.7833(a), you must demonstrate continuous
    compliance with the emission and opacity limits according to the
                            following table:
------------------------------------------------------------------------
                                       You must demonstrate continuous
             For . . .                       compliance by . . .
------------------------------------------------------------------------
1. Each windbox exhaust stream at   a. Maintaining emissions of
 an existing sinter plant.           particulate matter at or below 0.4
                                     lb/ton of product sinter; and
                                    b. Conducting subsequent performance
                                     tests at the frequencies specified
                                     in Sec.   63.7821.
2. Each windbox exhaust stream at   a. Maintaining emissions of
 a new sinter plant.                 particulate matter at or below 0.3
                                     lb/ton of product sinter; and
                                    b. Conducting subsequent performance
                                     tests at the frequencies specified
                                     in Sec.   63.7821.

[[Page 42750]]

 
3. Each discharge end at an         a. Maintaining emissions of
 existing sinter plant.              particulate matter from one or more
                                     control devices at or below 0.02 gr/
                                     dscf; and
                                    b. Maintaining the opacity of
                                     secondary emissions that exit any
                                     opening in the building or
                                     structure housing the discharge end
                                     at or below 20 percent (6-minute
                                     average); and
                                    c. Conducting subsequent performance
                                     tests at the frequencies specified
                                     in Sec.   63.7821.
4. Each discharge end at a new      a. Maintaining emissions of
 sinter plant.                       particulate matter from one or more
                                     control devices at or below 0.01 gr/
                                     dscf; and
                                    b. Maintaining the opacity of
                                     secondary emissions that exit any
                                     opening in the building or
                                     structure housing the discharge end
                                     at or below 10 percent (6-minute
                                     average); and
                                    c. Conducting subsequent performance
                                     tests at the frequencies specified
                                     in Sec.   63.7821.
5. Each sinter cooler at an         a. Maintaining the opacity of
 existing sinter plant.              emissions that exit any sinter
                                     cooler at or below 10 percent (6-
                                     minute average); and
                                    b. Conducting subsequent performance
                                     tests at the frequencies specified
                                     in Sec.   63.7821.
6. Each sinter cooler at a new      a. Maintaining emissions of
 sinter plant.                       particulate matter at or below 0.1
                                     gr/dscf; and
                                    b. Conducting subsequent performance
                                     tests at the frequencies specified
                                     in Sec.   63.7821.
7. Each casthouse at an existing    a. Maintaining emissions of
 blast furnace.                      particulate matter from a control
                                     device at or below 0.01 gr/dscf;
                                     and
                                    b. Maintaining the opacity of
                                     secondary emissions that exit all
                                     openings in the casthouse or
                                     structure housing the casthouse at
                                     or below 20 percent (6-minute
                                     average); and
                                    c. Conducting subsequent performance
                                     tests at the frequencies specified
                                     in Sec.   63.7821.
8. Each casthouse at a new blast    a. Maintaining emissions of
 furnace.                            particulate matter from a control
                                     device at or below 0.003 gr/dscf;
                                     and
                                    b. Maintaining the opacity of
                                     secondary emissions that exit all
                                     openings in the casthouse or
                                     structure housing the casthouse at
                                     or below 15 percent (6-minute
                                     average); and
                                    c. Conducting subsequent performance
                                     tests at the frequencies specified
                                     in Sec.   63.7821.
9. Each BOPF at a new or existing   a. Maintaining emissions of
 BOPF shop.                          particulate matter from the primary
                                     control system for a BOPF with a
                                     closed hood system at or below 0.03
                                     gr/dscf; and
                                    b. Maintaining emissions of
                                     particulate matter from the primary
                                     control system for a BOPF with an
                                     open hood system at or below 0.02
                                     gr/dscf for an existing BOPF shop
                                     or 0.01 gr/dscf for a new BOPF
                                     shop; and
                                    c. Maintaining emissions of
                                     particulate matter from a control
                                     device applied solely to secondary
                                     emissions from a BOPF at or below
                                     0.01 gr/dscf for an existing BOPF
                                     shop or 0.0052 gr/dscf for a new
                                     BOPF shop; and
                                    d. Conducting subsequent performance
                                     tests at the frequencies specified
                                     in Sec.   63.7821.
10. Each hot metal transfer,        a. Maintaining emissions of
 skimming, and desulfurization       particulate matter from a control
 operation at a new or existing      device at or below 0.01 gr/dscf at
 BOPF shop.                          an existing BOPF or 0.003 gr/dscf
                                     for a new BOPF; and
                                    b. Conducting subsequent performance
                                     tests at the frequencies specified
                                     in Sec.   63.7821.
11. Each ladle metallurgy           a. Maintaining emissions of
 operation at a new or existing      particulate matter from a control
 BOPF shop.                          device at or below 0.01 gr/dscf at
                                     an existing BOPF shop or 0.004 gr/
                                     dscf for a new BOPF shop; and
                                    b. Conducting subsequent performance
                                     tests at the frequencies specified
                                     in Sec.   63.7821.
12. Each existing BOPF shop.......  a. Maintaining the opacity of
                                     secondary emissions that exit any
                                     opening in the BOPF shop or other
                                     building housing the BOPF shop or
                                     shop operation at or below 20
                                     percent (3-minute average); and
                                    b. Conducting subsequent performance
                                     tests at the frequencies specified
                                     in Sec.   63.7821.
13. Each new BOPF shop............  a. Maintaining the opacity (for any
                                     set of 6-minute averages) of
                                     secondary emissions that exit any
                                     opening in the BOPF shop or other
                                     building housing a bottom-blown
                                     BOPF or shop operation at or below
                                     10 percent, except that one 6-
                                     minute period greater than 10
                                     percent but no more than 20 percent
                                     may occur once per steel production
                                     cycle; and
                                    b. Maintaining the opacity (for any
                                     set of 3-minute averages) of
                                     secondary emissions that exit any
                                     opening in the BOPF shop or other
                                     building housing a top-blown BOPF
                                     or shop operation at or below 10
                                     percent, except that one 3-minute
                                     period greater than 10 percent but
                                     less than 20 percent may occur once
                                     per steel production cycle; and
                                    c. Conducting subsequent performance
                                     tests at the frequencies specified
                                     in Sec.   63.7821.
14. Each BOPF Group at an existing  a. Maintaining emissions of mercury
 BOPF shop.                          from the collection of BOPF Group
                                     control devices at or below 0.00026
                                     lb/ton steel scrap input to the
                                     BOPF; and
                                    b. Conducting subsequent performance
                                     tests at the frequencies specified
                                     in Sec.   63.7821.
15. Each BOPF Group at a new BOPF   a. Maintaining emissions of mercury
 shop.                               from the collection of BOPF Group
                                     control devices at or below 0.00008
                                     lb/ton steel scrap input to the
                                     BOPF; and
                                    b. Conducting subsequent performance
                                     tests at the frequencies specified
                                     in Sec.   63.7821.
------------------------------------------------------------------------

0
26. Table 4 to Subpart FFFFF of Part 63 is revised to read as follows:

[[Page 42751]]



            Table 4 to Subpart FFFFF of Part 63--Applicability of General Provisions to Subpart FFFFF
  As required in Sec.   63.7850, you must comply with the requirements of the NESHAP General Provisions (40 CFR
                                part 63, subpart A) shown in the following table:
----------------------------------------------------------------------------------------------------------------
                                                               Applies to  subpart
              Citation                       Subject                  FFFFF                  Explanation
----------------------------------------------------------------------------------------------------------------
Sec.   63.1........................  Applicability.........  Yes...................
Sec.   63.2........................  Definitions...........  Yes...................
Sec.   63.3........................  Units and               Yes...................
                                      Abbreviations.
Sec.   63.4........................  Prohibited Activities.  Yes...................
Sec.   63.5........................  Construction/           Yes...................
                                      Reconstruction.
Sec.   63.6(a), (b), (c), (d),       Compliance with         Yes...................
 (e)(1)(iii), (f)(2)-(3), (g),        Standards and
 (h)(2)(ii)-(h)(9).                   Maintenance
                                      Requirements.
Sec.   63.6(e)(1)(i)...............  General Duty to         No....................  See Sec.   63.7810(c) for
                                      Minimize Emissions.                             general duty requirement.
Sec.   63.6(e)(1)(ii)..............  Requirement to Correct  No....................
                                      Malfunctions ASAP.
Sec.   63.6(e)(3)..................  SSM Plan Requirements.  No....................
Sec.   63.6(f)(1)..................  SSM Exemption.........  No....................
Sec.   63.6(h)(1)..................  SSM Exemption.........  No....................
Sec.   63.6(h)(2)(i)...............  Determining Compliance  No....................  Subpart FFFFF specifies
                                      with Opacity and VE                             methods and procedures for
                                      Standards.                                      determining compliance
                                                                                      with opacity emission and
                                                                                      operating limits.
Sec.   63.6(i).....................  Extension of            Yes...................
                                      Compliance with
                                      Emission Standards.
Sec.   63.6(j).....................  Exemption from          Yes...................
                                      Compliance with
                                      Emission Standards.
Sec.   63.7(a)(1)-(2)..............  Applicability and       No....................  Subpart FFFFF and specifies
                                      Performance Test                                performance test
                                      Dates.                                          applicability and dates.
Sec.   63.7(a)(3), (b)-(d), (e)(2)-  Performance Testing     Yes...................
 (4), (f)-(h).                        Requirements.
Sec.   63.7(e)(1)..................  Performance Testing...  No....................  See Sec.  Sec.
                                                                                      63.7822(a), 63.7823(a),
                                                                                      and 63.7825(a).
Sec.   63.8(a)(1)-(3), (b),          Monitoring              Yes...................  CMS requirements in Sec.
 (c)(1)(ii), (c)(2)-(3), (c)(4)(i)-   Requirements.                                   Sec.   63.8(c)(4)(i)-(ii),
 (ii), (c)(5)-(6), (c)(7)-(8),                                                        (c)(5)-(6), (d)(1)-(2),
 (d)(1)-(2), (e), (f)(1)-(5),                                                         and (e) apply only to
 (g)(1)-(4).                                                                          COMS.
Sec.   63.8(a)(4)..................  Additional Monitoring   No....................  Subpart FFFFF does not
                                      Requirements for                                require flares.
                                      Control Devices in
                                      Sec.   63.11.
Sec.   63.8(c)(1)(i)...............  General Duty to         No....................
                                      Minimize Emissions
                                      and CMS Operation.
Sec.   63.8(c)(1)(iii).............  Requirement to Develop  No....................
                                      SSM Plan for CMS.
Sec.   63.8(c)(4)..................  Continuous Monitoring   No....................  Subpart FFFFF specifies
                                      System Requirements.                            requirements for operation
                                                                                      of CMS.
Sec.   63.8(d)(3)..................  Written procedures for  No....................  See Sec.   63.7842(b)(3).
                                      CMS.
Sec.   63.8(f)(6)..................  RATA Alternative......  No....................
Sec.   63.8(g)(5)..................  Data Reduction........  No....................  Subpart FFFFF specifies
                                                                                      data reduction
                                                                                      requirements.
Sec.   63.9........................  Notification            Yes...................  Additional notifications
                                      Requirements.                                   for CMS in Sec.   63.9(g)
                                                                                      apply only to COMS.
Sec.   63.10(a), (b)(1), (b)(2)(x),  Recordkeeping and       Yes...................  Additional records for CMS
 (b)(2)(xiv), (b)(3), (c)(1)-(6),     Reporting                                       in Sec.   63.10(c)(1)-(6),
 (c)(9)-(14), (d)(1)-(4), (e)(1)-     Requirements.                                   (9)-(14), and reports in
 (2), (e)(4), (f).                                                                    Sec.   63.10(d)(1)-(2)
                                                                                      apply only to COMS.
Sec.   63.10(b)(2)(i)..............  Recordkeeping of        No....................
                                      Occurrence and
                                      Duration of Startups
                                      and Shutdowns.
Sec.   63.10(b)(2)(ii).............  Recordkeeping of        No....................  See Sec.   63.7842(a)(2)-
                                      Failures to Meet a                              (4) for recordkeeping of
                                      Standard.                                       (1) date, time and
                                                                                      duration of failure to
                                                                                      meet the standard; (2)
                                                                                      listing of affected source
                                                                                      or equipment, and an
                                                                                      estimate of the quantity
                                                                                      of each regulated
                                                                                      pollutant emitted over the
                                                                                      standard; and (3) actions
                                                                                      to minimize emissions and
                                                                                      correct the failure.
Sec.   63.10(b)(2)(iii)............  Maintenance Records...  Yes...................
Sec.   63.10(b)(2)(iv).............  Actions Taken to        No....................  See Sec.   63.7842(a)(4)
                                      Minimize Emissions                              for records of actions
                                      During SSM.                                     taken to minimize
                                                                                      emissions.
Sec.   63.10(b)(2)(v)..............  Actions Taken to        No....................  See Sec.   63.7842(a)(4)
                                      Minimize Emissions                              for records of actions
                                      During SSM.                                     taken to minimize
                                                                                      emissions.
Sec.   63.10(b)(2)(vi).............  Recordkeeping for CMS   Yes...................
                                      Malfunctions.
Sec.   63.10(b)(2)(vii)-(ix).......  Other CMS Requirements  Yes...................
Sec.   63.10(b)(2)(xiii)...........  CMS Records for RATA    No....................
                                      Alternative.
Sec.   63.10(c)(7)-(8).............  Records of Excess       No....................  Subpart FFFFF specifies
                                      Emissions and                                   record requirements; see
                                      Parameter Monitoring                            Sec.   63.7842.
                                      Exceedances for CMS.
Sec.   63.10(c)(15)................  Use of SSM Plan.......  No....................

[[Page 42752]]

 
Sec.   63.10(d)(5)(i)..............  Periodic SSM Reports..  No....................  See Sec.   63.7841(b)(4)
                                                                                      for malfunction reporting
                                                                                      requirements.
Sec.   63.10(d)(5)(ii).............  Immediate SSM Reports.  No....................
Sec.   63.10(e)(3).................  Excess Emission         No....................  Subpart FFFFF specifies
                                      Reports.                                        reporting requirements;
                                                                                      see Sec.   63.7841.
Sec.   63.11.......................  Control Device          No....................  Subpart FFFFF does not
                                      Requirements.                                   require flares.
Sec.   63.12.......................  State Authority and     Yes...................
                                      Delegations.
Sec.   63.13-Sec.   63.16..........  Addresses,              Yes...................
                                      Incorporations by
                                      Reference,
                                      Availability of
                                      Information and
                                      Confidentiality,
                                      Performance Track
                                      Provisions.
----------------------------------------------------------------------------------------------------------------

[FR Doc. 2019-17349 Filed 8-15-19; 8:45 am]
BILLING CODE 6560-50-P


