[Federal Register Volume 84, Number 126 (Monday, July 1, 2019)]
[Proposed Rules]
[Pages 31281-31286]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2019-14018]


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ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 300

[EPA-HQ-SFUND-1994-0009; FRL-9995-91-Region 1]


National Oil and Hazardous Substances Pollution Contingency Plan; 
National Priorities List: Partial Deletion of the U.S. Coast Guard 
(USCG) Buoy Depot of the South Weymouth Naval Air Station Superfund 
Site

AGENCY: Environmental Protection Agency (EPA).

ACTION: Proposed rule; notice of intent.

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SUMMARY: The Environmental Protection Agency (EPA) Region 1 is 
publishing a Notice of Intent for Partial Deletion of the U.S. Coast 
Guard (USCG) Buoy Depot, the South Weymouth Naval Air Station (NAS) 
Superfund Site (the Site) (MA2170022022) in Weymouth, Massachusetts, 
from the National Priorities List (NPL) and requests public comments on 
this proposed action. The NPL, promulgated pursuant to section 105 of 
the Comprehensive Environmental Response, Compensation, and Liability 
Act (CERCLA) of 1980, as amended, is an appendix of the National Oil 
and Hazardous Substances Pollution Contingency Plan (NCP). This partial 
deletion is being published by EPA with the concurrence of the 
Commonwealth of Massachusetts, through the Massachusetts Department of 
Environmental Protection (MassDEP), because EPA has determined that all 
appropriate response actions at the identified parcel under CERCLA have 
been completed. However, this partial deletion does not preclude future 
actions under Superfund.
    This partial deletion pertains to the USCG Buoy Depot, Operable 
Unit 10, located at 65 Trotter Road, South Weymouth, Massachusetts. The 
remaining Operable Units of the South Weymouth NAS will remain on the 
NPL and are not being considered for deletion as part of this action.

DATES: Comments must be received by July 31, 2019.

ADDRESSES: Submit your comments, identified by Docket ID no. EPA-HQ-
SFUND-1994-0009, by one of the following methods:
     http://www.regulations.gov. Follow on-line instructions 
for submitting comments. Once submitted, comments cannot be edited or 
removed from Regulations.gov. The EPA may publish any comment received 
to its public docket. Do not submit electronically any information you 
consider to be Confidential Business Information (CBI) or other 
information whose disclosure is restricted by statute. 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.
     Email: lim.robert@epa.gov.
     Mail: Robert Lim, U.S. EPA Remedial Project Manager, 5 
Post Office Square, Suite 100 (Mail code: 07-3), Boston, MA 02109-3912.
     Hand delivery: Robert Lim, U.S. EPA Remedial Project 
Manager, 5 Post Office Square, Suite 100 (Mail code 07-3), Boston, MA 
02109-3912. Such deliveries are only accepted during the Docket's 
normal hours of operation, and special arrangements should be made for 
deliveries of boxed information.
    Instructions: Direct your comments to Docket ID no. EPA-HQ-SFUND-
1994-0009. EPA's policy is that all comments received will be included 
in the public docket without change and may be made available online at 
http://www.regulations.gov, including any personal information 
provided, unless the comment includes information claimed to be 
Confidential Business Information (CBI) or other information whose 
disclosure is restricted by statute. Do not submit information that you 
consider to be CBI, or otherwise protected, through http://www.regulations.gov. or email. The http://www.regulations.gov. Website 
is an ``anonymous access'' system, which means 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 EPA without 
going through http://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, EPA recommends that you include your name 
and other contact information in the body of your comment and with any 
disk or CD-ROM you submit. If EPA cannot read your comment due to 
technical difficulties and cannot contact you for clarification, EPA 
may not be able to consider your comment. Electronic files should avoid 
the use of special characters, any form of encryption, and be free of 
any defects or viruses.
    Docket: All documents in the docket are listed in the http://www.regulations.gov index. Although listed in the index, some 
information is not publicly available, e.g., CBI or other information 
whose disclosure is restricted by statue. Certain other material, such 
as copyrighted material, will be publicly available only in hard copy. 
Publicly available docket materials are available either electronically 
in http://www.regulations.gov, or on disk or physical copy at:

EPA Region 1 Records Center, 5 Post Office Square, Suite 100, 1st 
Floor, Boston, MA 02109, Phone: 1-617-918-1440. Hours: Mon-Fri 8 a.m. 
to 5 p.m., excluding federal holidays
Navy Caretaker Site Office, 223 Shea Memorial Drive, South Weymouth,

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MA 02190 (Records may be viewed by appointment only. Contact Mr. David 
Barney at 781-626-0105 or David.a.barney@navy.mil to schedule an 
appointment)
Tufts Library, 46 Broad Street, Weymouth, MA 02188

FOR FURTHER INFORMATION CONTACT:
Robert Lim, Remedial Project Manager, U.S. Environmental Protection 
Agency, Region 1, 5 Post Office Square, Suite 100 (Mail code 07-3), 
Boston, MA 02109-3912, (617) 918-1392, email: lim.robert@epa.gov.

SUPPLEMENTARY INFORMATION:

Table of Contents

I. Introduction
II. NPL Deletion Criteria
III. Partial Deletion Procedures
IV. Basis for Site Partial Deletion

I. Introduction

    EPA Region 1 is publishing this Notice of Intent for Partial 
Deletion of the USCG Buoy Depot, designated Operable Unit 10 (OU10) 
within the South Weymouth Naval Air Station (NAS) Superfund Site (see 
Figure 1), from the NPL. This partial deletion pertains to all site 
media, including soil and groundwater associated with USCG Buoy Depot, 
which consists of approximately five acres and includes the following 
properties:

4.77 acres of property owned by the United States of America (United 
States Coast Guard) described in Quitclaim Deed dated October 30, 
1941 and recorded in book 6561, Page 513, also identified as Lot 
650-1 in Tax Map 58. Approximately 0.20 acres of property owned by 
the United States of America (United States Navy) described in 
Quitclaim Deed dated January 1, 1900, also identified as Plat 597-
152 in Tax Map 58. Approximately 0.04 acres of property owned by 
LSTAR Southfield, LLC, described in Quitclaim Deed dated July 2, 
2015 and recorded in book 33279, Page 51, also identified as Plat 
597-138 in Tax Map 58. Approximately 0.11 acres of property owned by 
LSTAR Southfield, LLC, described in Quitclaim Deed dated July 2, 
2015 and recorded in book 33279, Page 51, also identified as Plat 
597-137 in Tax Map 58.

    The properties are further depicted on Figure 2 of the ``Remedial 
Action Completion Report for the U.S. Coast Guard Industrial Production 
Detachment, South Weymouth, MA'' dated October 16, 2017 and will be 
referred to hereafter as ``the property proposed for deletion''. All 
tax map references are based on the Town of Weymouth 2015 Tax Maps.
    The NPL constitutes Appendix B of the NCP (40 CFR part 300), which 
EPA promulgated pursuant to Section 105 of the CERCLA. EPA maintains 
the NPL as the list of sites that appear to present a significant risk 
to public health, welfare, or the environment. Sites on the NPL may be 
the subject of remedial actions financed by the Hazardous Substance 
Superfund (Fund). This partial deletion of the USCG Buoy Depot within 
the Site is proposed in accordance with 40 CFR 300.425(e) and is 
consistent with the ``Notice of Policy Change: Partial Deletion of 
Sites Listed on the National Priorities List'' 60 FR 55466 (Nov. 1, 
1995). As described in 300.425(e)(3) of the NCP, a portion of a site 
deleted from the NPL remains eligible for Fund financed remedial action 
if future conditions warrant such actions.
    EPA will accept comments on the proposal to partially delete this 
site for thirty (30) days after publication of this document in the 
Federal Register.
    Section II of this document explains the criteria for deleting 
sites from the NPL. Section III discusses procedures that EPA is using 
for this action. Section IV discusses the property proposed for 
deletion and demonstrates how it meets the deletion criteria. Section V 
discusses EPA's proposal to delete the Site parcel from the NPL.

II. NPL Deletion Criteria

    The NCP establishes the criteria that EPA uses to delete sites from 
the NPL. In accordance with 40 CFR 300.425(e), sites may be deleted 
from the NPL where no further response is appropriate. In making such a 
determination pursuant to 40 CFR 300.425(e), EPA will consider, in 
consultation with the State, whether any of the following criteria have 
been met:
    i. Responsible parties or other persons have implemented all 
appropriate response actions required;
    ii. All appropriate Fund-financed response under CERCLA has been 
implemented, and no further response action by responsible parties is 
appropriate; or
    iii. The remedial investigation has shown that the release poses no 
significant threat to public health or the environment and, therefore, 
the taking of remedial measures is not appropriate.

III. Partial Deletion Procedures

    The following procedures apply to the partial deletion of the USCG 
Buoy Depot from the Site:
    (1) EPA has consulted with the Commonwealth of Massachusetts prior 
to developing this Notice of Intent for Partial Deletion.
    (2) EPA has provided the Commonwealth 30 working days for review of 
this notice prior to its publication.
    (3) In accordance with the criteria discussed above, EPA has 
determined that no further response is appropriate.
    (4) The Commonwealth, through MassDEP by a letter dated April 19, 
2019 has concurred on the proposal for partial deletion of the USCG 
Buoy Depot from the Site.
    (5) Concurrently, with the publication of this Notice of Intent for 
Partial Deletion in the Federal Register, a notice of the availability 
of the Notice of Intent for Partial Deletion is being published in the 
Patriot Ledger, a major local newspaper. The newspaper notice announces 
the 30-day public comment period concerning the Notice of Intent for 
Partial Deletion of the USCG Buoy Depot from the NPL.
    (6) The EPA placed copies of documents supporting the partial 
deletion in the deletion docket and made these items available for 
public inspection and copying at the Site information repositories 
identified above.
    If comments are received within the 30-day public comment period on 
this partial deletion action, EPA will evaluate and respond accordingly 
to the comments before making a final decision to delete the USCG Buoy 
Depot. If necessary, EPA will prepare a Responsiveness Summary to 
address any significant public comments received. After the public 
comment period, if EPA determines it is still appropriate to delete the 
USCG Buoy Depot of the South Weymouth Naval Air Station (NAS) Superfund 
Site, the EPA Regional Administrator will publish a final Notice of 
Partial Deletion in the Federal Register. Public notices, public 
submissions and copies of the Responsiveness Summary, if prepared, will 
be made available to interested parties and included in the site 
information repositories listed above.
    Deletion of a portion of a site from the NPL does not in any way 
alter EPA's right to take enforcement actions, as appropriate. The NPL 
is designed primarily for informational purposes and to assist EPA 
management. Section 300.425(e)(3) of the NCP states that the deletion 
of a site from the NPL does not preclude eligibility for further 
response actions, should future conditions warrant such actions.

IV. Basis for Site Partial Deletion

    The following information provides EPA's rationale for deleting the 
USCG Buoy Depot of the South Weymouth NAS Site from the NPL:

Site Location

    The USCG Buoy Depot is located on the South Weymouth NAS which

[[Page 31283]]

operated from 1942 to 1997, and is located approximately 15 miles 
southeast of Boston, Massachusetts, in Norfolk County in the Town of 
Weymouth. As of the 2010 census, Weymouth has a population of 55,643.

Site Description

    The USCG Buoy Depot, now currently operating as the USCG Industrial 
Production Detachment South Weymouth (IPDSW), is the USCG's principal 
facility in the northeast for storing, cleaning, repairing, and 
painting navigational buoys. The facility is owned and operated by the 
USCG.\1\ Within the IPDSW there is a two-story, steel and concrete 
block building occupying approximately 20,000 square feet on the 
northwestern portion of the property. Asphalt and concrete paved 
driveways surround the building. Most of the property is a dirt and 
gravel-covered buoy storage area to the south and east of the building. 
A drainage swale exists along the southern fence line of the property. 
The swale and a portion of a wetland on an adjacent property were 
impacted by past operations and are considered part of the site.
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    \1\ OU10 does include some limited areas of Navy and private 
property immediately adjacent to the USCG facility where 
contamination had historically migrated off the USCG facility as 
previously noted.
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Operational History

    On March 1, 1972, the USCG leased the property from the Navy which 
contains the Buoy Depot. Prior to development, the property was an 
undeveloped property of the South Weymouth NAS which closed in 1997 
under the Defense Base Realignment and Closure Act of 1990 (BRAC). In 
October 2000, the Buoy Depot property was transferred to the USCG from 
the Navy through a Federal Agency to Federal Agency Transfer. Upon 
transfer of the property from the Navy, the USCG also assumed 
responsibility for the CERCLA investigation of Buoy Depot.
    The USCG Buoy Depot was constructed in 1973 and is the USCG's 
principal facility in the northeast for the storing, cleaning, 
repairing, and painting navigational buoys. Its operations have 
included buoy rehabilitation (e.g., shot blasting to remove old paint, 
welding, painting, electrical wiring); minor vehicle and equipment 
maintenance; waste generation (steel shot blast residue, waste oils, 
paint-related waste) and fuel storage; warehousing; outdoor scrap metal 
storage; and administrative use.
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    The USCG stopped buying lead-based paint and primers for buoys in 
1986. Because buoys are refurbished every six-to-eight years, all the 
USCG buoys have been cycled through the system and repainted with non-
lead based paint.

Conditions That Led to Placement on National Priorities List (NPL)

    In March 1988, the Navy conducted a Preliminary Assessment (PA) 
under the Installation Restoration Program. The PA consisted of a 
records search, site visit, and interviews. The PA Report identified 
five potential hazardous waste sites based on past practices: Site 1, 
the West Gate Landfill; Site 2, the RDA Site; Site 3, the Small 
Landfill (SL); Site 4, the Former Fire Training Area (FFTA); and Site 
5, the Tile Leach Field (TLF).

[[Page 31285]]

    The Navy completed a Site Inspection (SI) in December 1991. The SI 
investigated the five potential sites identified in the PA as well as 
three additional sites the Navy added to the program: Site 6, the Fuel 
Farm; Site 7, the former Sewer Treatment Plant (STP); and Site 8, the 
Abandoned Bladder Tank Fuel Storage Area. The SI included site 
walkovers; geophysical surveys; installation of monitoring wells; and 
analysis of soil, sediment, surface water, and groundwater samples.
    The USCG Buoy Depot was part of the NPL listing for South Weymouth 
NAS due to contamination from facility operations that was present in 
the surface soil of the storage area and in an adjacent drainage swale 
and wetland.

National Priorities List Designation

    The Site was proposed to the NPL on 6/23/1993 (58 FR 34018) and 
added to the NPL on 5/31/1994 (59 FR 27989). The listing included the 
USCG Buoy Depot. The CERCLIS ID for South Weymouth NAS is MA2170022022, 
and for USCG Buoy Depot is MA0690330758.

Ongoing Redevelopment

    While the former South Weymouth NAS (currently referred to as 
``Union Point'') undergoes redevelopment due to Base Realignment and 
Closure process with the Southfield Redevelopment Authority 
implementing plans for commercial, residential, and mixed uses, along 
with recreational areas and open space, the USCG Buoy Depot, currently 
named the USCG Industrial Production Detachment South Weymouth (IPDSW), 
continues to operate as the USCG's principal facility in the northeast 
for storing, cleaning, repairing, and painting navigational buoys.

Operable Units at the Site

    Beginning in 1995, remedial investigations at South Weymouth NAS 
have identified 27 operable units. The USCG Buoy Depot has been 
designated as Operable Unit 10 (OU10) and is described as follows:

OU10--Former U.S. Coast Guard Buoy Depot

    Beginning in 1972, former Buoy Depot operations have included buoy 
rehabilitation (e.g., ``shot blasting'' to remove old paint, welding, 
painting, and electrical wiring), minor vehicle and equipment 
maintenance, waste generation (steel shot blast residue, waste oils, 
paint-related waste) and fuel storage, warehousing, outdoor scrap metal 
storage, and administrative use. Most of the buoys are constructed of 
steel and range in size from three feet (ft) to greater than 30 ft in 
length and can weigh up to 20,000 pounds. Old or damaged buoys that are 
beyond repair are stored at the current IPDSW pending sale as scrap 
metal.
    As a result of prior facility operations (i.e., buoy storage, 
refurbishment, and scrapping), lead and paint chips were present in the 
surface soil of the buoy storage area. Due to stormwater runoff, 
surface soils in the downgradient and off-site drainage swale and 
wetland area were impacted with metals, primarily lead, from the former 
Buoy Depot. The USCG ceased purchasing lead-based paint (LBP) and 
primers for buoys in 1986. The USCG was required to deplete this 
existing paint inventory by 1988. Buoys are refurbished every six-to-
eight years. Therefore, most of the USCG's buoys that are now received 
at the current IPDSW have been cycled through the system and repainted 
with non-LBP multiple times.

Remedial Investigation and Feasibility Study (RI/FS)

    The RI investigated three areas of concern at USCG Buoy Depot in 
2001. It concluded that no further action was required for areas 
related to the septic system tank, piping, and leach field. The two 
other areas were addressed through removal actions in 1999, 2003, and 
from 2004 to 2005.
    In 1999, a time-critical removal action addressed lead-contaminated 
soil near a former dust collection system by removing 26 cubic yards of 
soil. In 2003, a non-time critical removal action addressed a floor 
drain system by removing 100 cubic yards of sludge piping and impacted 
soil. From 2004 to 2005, also as part of the non-time critical removal 
action beginning in 2003, the USCG excavated approximately 165 cubic 
yards of metals-contaminated soil from the offsite drainage swale and 
wetland area.
    The Human Health and Ecological Risk Assessments determined that 
lead in soil and sediment was the only contaminant of concern (COC) for 
which significant risks were identified in both adult and child lead 
modelling, and in ecological receptors. Groundwater quality was 
consistent with background conditions and, therefore, no groundwater 
risks were identified.

Selected Remedy

    A Record of Decision (ROD) was finalized in September 2006 and 
selected land use controls (institutional and engineering controls), 
long-term monitoring, and five-year reviews. This decision also took 
into consideration the completion of removal actions prior to 
finalization of the ROD.
    The Response Action Objectives in the ROD included both Removal 
Action Objectives and Remedial Action Objectives (RAO). The following 
goals were developed during the EE/CA for the non-time critical removal 
action completed in 2005:

 Prevention, to the extent practicable, of direct contact with 
and ingestion of surficial soil that presents unacceptable risks to 
human health and/or ecological receptors (i.e., the soil of the swale 
and wetlands)
 Prevention of potential future impacts to groundwater beneath 
the site through removal of impacted soil and sludge-associated with 
existing floor drains beneath the site building
 Prevent ongoing migration of metals (primarily lead) from the 
buoy storage area to the adjacent drainage ~wale and the downstream 
wetland, and prevention of future migration to the extent possible.

    The Feasibility Study presented the following response action 
objectives for the buoy storage area:

 Prevent future human (residential) exposure to lead and 
potential LBP chips in soil of the buoy storage area
 Prevent COCs in on-site soil from migrating off the Buoy Depot 
property

    The ROD consisted of the following elements:

 No Further Action for Area of Concern (AOC) 1 (i.e., building 
and adjacent areas to the south);
 No Action for AOC 2 (i.e., septic system tank, piping, and 
leach field);
 Implement LUCs for AOC 3 (area where buoy, equipment and scrap 
metal were stored) of the current USCG IPDSW property that include (1) 
Institutional Controls to prohibit current and future non-commercial/
industrial uses of the current IPDSW property, and (2) Engineering 
Controls to prevent the migration of contaminated soil from the buoy 
storage area.;
 Conduct Long-Term Monitoring of the surface soil in the 
stormwater drainage swale and downstream wetland area on adjacent 
property controlled by LSTAR Management, LLC and the Navy to ensure the 
long-term effectiveness of the remedy for protecting human health and 
the environment; and
 Five-Year Reviews for AOC 3 (i.e., buoy, equipment, and scrap 
metal storage area).

    The USCG attempted to reduce the potential for recontamination of 
the swale and wetland through the

[[Page 31286]]

construction of a stormwater management system, which reduced the 
transport of soil particles and paint chips from the buoy storage area. 
The surface soil was not remediated under the ROD because it did not 
pose an unacceptable risk for commercial/industrial use. After 
finalization of the ROD, the results of the long-term monitoring 
program determined a need for additional action which is discussed 
below.
    The USCG completed the first statutory Five-Year Review of the USCG 
Buoy Depot property in December 2011 which identified increasing 
concentrations of metals in the swale and wetland area downstream of 
the stormwater management system. The increasing trend in metals 
concentrations suggested that the stormwater management system was not 
containing the contaminants known to exist in surface soils in the buoy 
storage area. The Five-Year Review recommended continued O&M activities 
associated with the stormwater management system and continued 
monitoring to further evaluate contaminant concentration trends.
    Based on the increasing concentration trends found in the Five-Year 
Review, the USCG conducted a study to evaluate the effectiveness of the 
stormwater management system and to develop alternatives to enhance the 
control of contaminant discharge to the swale and wetland area. The 
report titled Evaluation of Alternatives for Minimizing Off-Site 
Transport of Contaminated Sediment from the Stormwater Management 
System (Watermark, 2014) included evaluation of the following five 
alternatives to effectively control contaminant discharge from the buoy 
storage area:
    1. Remove contaminated soil from the buoy storage area and replace 
with clean fill;
    2. Pave the remaining unpaved areas of the buoy storage area;
    3. Expand the upstream detention system;
    4. Install upstream filtration; and
    5. Install downstream filtration.
    Upon consideration of each alternative, the USCG determined that 
removal of contaminated soil in the buoy storage area and replacement 
with clean fill represented a permanent solution to the contaminant 
migration issue. The decision to conduct a soil removal action for the 
buoy storage area and drainage swale was based on an increasing trend 
in metals concentrations in a swale and wetland area which suggested 
that the stormwater management system was not containing the 
contaminants known to exist in surface soils in the buoy storage area. 
This study which was published in 2013 also contained alternatives to 
control the contaminant discharge to the swale and wetland area.
    The USCG produced an updated Engineering Evaluation/Cost Analysis 
(EE/CA) in February 2016 which provided a comparative analysis of the 
actions detailed in the 2014 Report. The EE/CA recommended Alternative 
1, the removal of contaminated soil from the buoy storage area and 
replacement with clean fill. A Removal Action Memorandum was prepared 
in April 2016 to support this determination.
    From December 2016 to February 2017, USCG performed a removal 
action to excavate subsurface soils from with the current IPDSW fence 
line, drainage swale, and wetland. Over 4,125 cubic yards of soil was 
excavated and disposed of at a licensed facility. No contaminated soil 
with metals exceeding the following clean-up criteria remain on the 
current IPDSW following this removal effort.
    The cleanup goals for the soil remediation project were:

 Arsenic 20 milligrams per kilogram (mg/kg)
 Chromium 16 mg/kg
 Copper 1,020 mg/kg
 Lead 200 mg/kg
 Nickel 230 mg/kg
 Zinc 738 mg/kg

    The Final Remedial Action Completion Report documented the post-
excavation soil sampling and analysis and that the soil remaining at 
the site meets the site cleanup criteria.
    An Explanation of Significant Differences (ESD) for the USCG Buoy 
Depot was finalized on September 27, 2017. The ESD documented no 
further action for the buoy storage area (AOC 3) of the USCG Buoy Depot 
because soil removal actions conducted from December 2016 to February 
2017 achieved cleanup levels allowing for unlimited use and 
unrestricted exposure. In addition, the ESD eliminated the future need 
of land use controls, performing long-term monitoring, and conducting 
five-year reviews.

Community Involvement

    USCG and EPA have kept the community and other interested parties 
informed throughout cleanup of the site. Notice of this proposal will 
be placed in the local newspaper, the Patriot Ledger. While the levels 
of community concern and involvement have been high for the South 
Weymouth Naval Air Station as a whole, especially with regard to 
redevelopment, levels of community concern have been low for Buoy 
Depot.

Determination That the Criteria for Deletion Have Been Met

    The NCP specifies that EPA may delete a site from the NPL if: All 
appropriate Fund-financed response under CERCLA has been implemented, 
and no further response action by responsible parties is appropriate; 
as required by 40 CFR 300.425(e)(1)(ii). This criteria was met, as 
described, for the partial deletion proposed at the USCG Buoy Depot 
Operable Unit from the South Weymouth NAS Superfund Site. A Remedial 
Action Completion Report was issued on October 16, 2017 to document the 
completion of the Remedial Action activities for the area subject to 
this partial de-listing. EPA, with the concurrence of the Commonwealth 
of Massachusetts through MassDEP by a letter dated April 19, 2019, 
believes these criteria for deletion have been satisfied. Therefore, 
EPA is proposing the deletion of USCG Buoy Depot operable unit (OU10) 
from the South Weymouth NAS Superfund Site. All of the completion 
requirements for the property proposed for deletion at the site have 
been met.
     The implemented remedies achieve the degree of cleanup or 
protection specified in the ROD and ESD for the area proposed for 
deletion.
     The selected remedial and removal action objectives and 
associated cleanup levels for the areas proposed for deletion are 
consistent with agency policy and guidance.
     No further Superfund response in the areas proposed for 
deletion are needed to protect human health and the environment.

List of Subjects in 40 CFR Part 300

    Environmental protection, Air pollution control, Chemicals, 
Hazardous waste, Hazardous substances, Intergovernmental relations, 
Penalties, Reporting and recordkeeping requirements, Superfund, Water 
pollution control, Water supply.

    Authority: 33 U.S.C. 1321(d); 42 U.S.C. 9601-9657; E.O. 13626, 
77 FR 56749, 3 CFR, 2013 Comp., p. 306; E.O. 12777, 56 FR 54757, 3 
CFR, 1991 Comp., p. 351; E.O. 12580, 52 FR 2923, 3 CFR, 1987 Comp., 
p. 193.

     Dated: June 18, 2019.
Deborah A. Szaro,
Acting Regional Administrator, Region 1.
[FR Doc. 2019-14018 Filed 6-28-19; 8:45 am]
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