National Oil and Hazardous Substances Pollution Contingency Plan; National Priorities List: Partial Deletion of the Allied Chemical & Ironton Coke Superfund Site, 37763-37777 [2020-13302]

Agencies

• ENVIRONMENTAL PROTECTION AGENCY

[Federal Register Volume 85, Number 122 (Wednesday, June 24, 2020)]
[Rules and Regulations]
[Pages 37763-37777]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2020-13302]


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ENVIRONMENTAL PROTECTION AGENCY

40 CFR Part 300

[EPA-HQ-SFUND-1983-0002; FRL-10010-67-Region 5]


National Oil and Hazardous Substances Pollution Contingency Plan; 
National Priorities List: Partial Deletion of the Allied Chemical & 
Ironton Coke Superfund Site

AGENCY: Environmental Protection Agency (EPA).

ACTION: Direct final rule.

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SUMMARY: The Environmental Protection Agency (EPA) Region 5 is 
publishing a direct final Notice of Partial Deletion of soil (land), 
lagoon, and sediment portions of the Allied Chemical & Ironton Coke 
Superfund Site (Site), in Ironton, Ohio, from the National Priorities 
List (NPL). 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. This direct final 
partial deletion is being published by EPA with the concurrence of the 
State of Ohio, through the Ohio Environmental Protection Agency, 
because all appropriate response actions for these Site media under 
CERCLA have been completed. However, this partial deletion does not 
preclude future actions under Superfund. This partial deletion does not 
include the OU2 ROD Soils Area 2 or the groundwater portions of the 
Site, which will remain on the NPL.

DATES: This direct final partial deletion is effective August 24, 2020 
unless EPA receives adverse comments by July 24, 2020. If adverse 
comments are received, EPA will publish a timely withdrawal of the 
direct final partial deletion in the Federal Register informing the 
public that the partial deletion will not take effect.

ADDRESSES: Submit your comments, identified by Docket ID No. EPA-HQ-
SFUND-1983-0002 by one of the following methods:
    https://www.regulations.gov. Follow the 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 https://www.epa.gov/dockets/commenting-epa-dockets.
    Email: [email protected].
    Written comments submitted by mail are suspended and no hand 
deliveries will be accepted. We encourage the public to submit comments 
via email or at https://www.regulations.gov.
    Instructions: Direct your comments to Docket ID no. EPA-HQ-SFUND-
1983-0002. 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 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. The https://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 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, 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 https://www.regulations.gov index. Although listed in the index, some 
information is

[[Page 37764]]

not publicly available, e.g., CBI or other information whose disclosure 
is restricted by statute. Certain other material, such as copyrighted 
material, will be publicly available only in hard copy. Publicly 
available docket materials are available electronically at https://www.regulations.gov and at https://www.epa.gov/superfund/allied-chemical-ironton or you may contact the person identified in the FOR 
FURTHER INFORMATION CONTACT section for additional availability 
information.
    The EPA is suspending its Docket Center and Regional Records 
Centers for public visitors to reduce the risk of transmitting COVID-
19. In addition, many site information repositories are closed and 
information in these repositories, including the deletion docket, has 
not been updated with hardcopy or electronic media. For further 
information and updates on EPA Docket Center services, please visit us 
online at https://www.epa.gov/dockets.
    The EPA continues to carefully and continuously monitor information 
from the Centers for Disease Control and Prevention (CDC), local area 
health departments, and our Federal partners so that we can respond 
rapidly as conditions change regarding COVID-19.

FOR FURTHER INFORMATION CONTACT: Karen Cibulskis, NPL Deletion 
Coordinator, U.S. Environmental Protection Agency Region 5, at (312) 
886-1843 or via email at [email protected].

SUPPLEMENTARY INFORMATION:

Table of Contents

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

I. Introduction

    EPA Region 5 is publishing this direct final Notice of Partial 
Deletion of the Allied Chemical & Ironton Coke Superfund Site (Allied 
Chemical Site or Site), from the NPL. The Allied Chemical Site covers 
129 acres and includes three operable units (OUs). The Goldcamp 
Disposal Area (GDA) is OU1. The former Coke Plant/Lagoon Area (CPLA) is 
OU2. The former Tar Plant is OU3. See Figures 1 and 2 in the Docket. 
Groundwater contamination is present below all three OUs, but is 
addressed as part of the OU1 and OU2 cleanup remedies.
    This partial deletion pertains to the soil (land) portion of OU1 
(GDA); the soil (land) and lagoons portion of OU2 (CPLA) except for the 
OU2 ROD Soils Area 2 located within the bermed area of the East Tank 
Farm (see Figure 3 in the Docket); and all of OU3 (which only addressed 
contaminated soil and sediment at the Tar Plant and in the adjacent 
Ohio River). The OU2 ROD Soils Area 2 located within the bermed area of 
the East Tank Farm contains components of the groundwater treatment 
system and will not be remediated until after the groundwater cleanup 
is complete. Therefore, the OU2 ROD Soils Area 2 is not being 
considered for deletion as part of this action. The contaminated 
groundwater at the Site, which is present below all three OUs but is 
being addressed as part of the OU1 and OU2 cleanup remedies, is 
undergoing a long-term cleanup and is also not being considered for 
deletion as part of this action. The OU2 ROD Soils Area 2 and the 
groundwater portions of the Allied Chemical Site (i.e., the groundwater 
portion of OU1 and OU2, which includes the contaminated groundwater 
below OU3) will remain on the NPL.
    The NPL constitutes Appendix B of the National Oil and Hazardous 
Substances Pollution Contingency Plan (NCP), which EPA promulgated 
pursuant to 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 Allied Chemical 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 40 CFR 300.425(e)(3) of the NCP, 
a portion of a site deleted from the NPL remains eligible for Fund-
financed remedial actions if future conditions warrant such actions.
    Section II of this document explains the criteria for deleting 
sites from the NPL. Section III discusses the procedures that EPA is 
using for this action. Section IV discusses the soil, lagoons, and 
sediment portions of OU1, OU2, and OU3 of the Allied Chemical Site 
included in this partial deletion and demonstrates how these media/
areas meet the deletion criteria. Section V discusses EPA's action to 
partially delete the soil, lagoons, and sediment in OU1, OU2, and OU3 
of the Allied Chemical Site (except for the soil in OU2 ROD Soils Area 
2) from the NPL unless adverse comments are received during the public 
comment period.

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, or portions 
thereof, 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.
    Pursuant to CERCLA Section 121(c) and the NCP, EPA conducts five-
year reviews to ensure the continued protectiveness of remedial actions 
where hazardous substances, pollutants, or contaminants remain at a 
site above levels that allow for unlimited use and unrestricted 
exposure. EPA conducts such five-year reviews even if a site or a 
portion of a site is deleted from the NPL. EPA may initiate further 
action to ensure continued protectiveness at a deleted site if new 
information becomes available that indicates it is appropriate. 
Whenever there is a significant release from a site deleted from the 
NPL, the deleted site may be restored to the NPL without application of 
the hazard ranking system.

III. Partial Deletion Procedures

    The following procedures apply to the deletion of the soil, 
lagoons, and sediment portions of OU1, OU2, and OU3 of the Allied 
Chemical Site, excluding the OU2 ROD Soils Area 2:
    (1) EPA consulted with the State of Ohio prior to developing this 
direct final Notice of Partial Deletion and the Notice of Intent for 
Partial Deletion co-published in the ``Proposed Rules'' section of the 
Federal Register.
    (2) EPA has provided the State 30 working days for review of this 
notice and the parallel Notice of Intent to Partially Delete prior to 
their publication today, and the State, through the Ohio Environmental 
Protection Agency (OEPA), concurred on the partial deletion of the 
Allied Chemical Site from the NPL on March 6, 2020.
    (3) Concurrent with the publication of this direct final Notice of 
Partial Deletion, an announcement of the availability of the parallel 
Notice of Intent for Partial Deletion is being published in a major 
local newspaper,

[[Page 37765]]

the Ironton Tribune. The newspaper notice announces the 30-day public 
comment period concerning the Notice of Intent for Partial Deletion of 
the Allied Chemical Site from the NPL.
    (4) 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 https://www.regulations.gov and at 
https://www.epa.gov/superfund/allied-chemical-ironton.
    (5) If adverse comments are received within the 30-day public 
comment period on this partial deletion action, EPA will publish a 
timely notice of withdrawal of this direct final Notice of Partial 
Deletion before its effective date and will prepare a response to 
comments and continue with the deletion process on the basis of the 
Notice of Intent for Partial Deletion and the comments already 
received.
    Deletion of a portion of a site from the NPL does not itself 
create, alter, or revoke any individual's rights or obligations. 
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 Partial Site Deletion

    The following information provides EPA's rationale for deleting the 
soil, lagoons, and sediment portions of OU1, OU2, and OU3, except for 
the soil in OU2 ROD Soils Area 2, of the Allied Chemical Site from the 
NPL.

Site Background and History

    The Allied Chemical Site (OHD043730217) is 129 acres and is located 
at 3330 South Third Street in Ironton, Lawrence County, Ohio (see 
Figure 1 in the Docket). The Site is surrounded by industries, 
businesses, private residences, waterways, and wetlands. Part of the 
Site is adjacent to, and includes, a portion of the Ohio River.
    The Allied Chemical Site is divided into three OUs (see Figure 2 in 
the Docket). OU1 is the Goldcamp Disposal Area (GDA) and is 10 acres in 
size. The GDA is a former sand and gravel pit that was used to dispose 
waste from the Site's Tar Plant, as well as waste from the Goldcamp 
Gravel Company and foundry sand from a nearby iron works.
    OU2 is the former Coke Plant/Lagoon Area (CPLA). The CPLA covers 91 
acres and contained the former Coke Plant and five lagoons. The CPLA is 
bordered by Ice Creek to the east and south. Ice Creek flows into the 
Ohio River and portions of the CPLA are within the 100 year floodplain. 
Eastern portions of the CPLA extend into the adjacent Village of Coal 
Grove, Ohio.
    OU2 includes groundwater below the CPLA and in the former Tar Plant 
area (OU3). Limited areas of soil contamination in OU3 were also 
evaluated and addressed as part of OU2.
    OU3 is the former Tar Plant area. The Tar Plant OU is 28 acres and 
consists of two parcels, the Main Parcel and the River Parcel. The Main 
Parcel is 16 acres and contained the former Tar Plant facility. The 
River Parcel is 12 acres and includes seven acres of the Ohio River 
(this varies with river elevation). The Main Parcel and the River 
Parcel of OU3 are separated by an active railroad track.
    Initial operations at the Allied Chemical Site began with the 
Ironton Solvay Coke Company (Ironton) Coke Plant (OU2). In 1926, 
Ironton and other companies united to form the Allied Chemical & Dye 
Corporation (Allied Chemical). From 1981 to 1999, Allied Chemical went 
through additional name changes, mergers and acquisitions and is 
currently Honeywell International Inc. (Honeywell).
    The Coke Plant operated from 1917 to 1982. Products from the coking 
operations included: Crude tar, coke, light oil, and ammonia. From 1920 
through the 1960s, the facility discharged wastewater and solid wastes 
generated during the coking process into the marshy area east of the 
plant adjacent to Ice Creek. The waste streams included process 
wastewater, coke and coal fines, tar decanter sludges, boiler ash, and 
weak ammonia liquor. Specific constituents present in the waste streams 
included: Ammonia, benzene, cyanide, metals, naphthalene, phenolics, 
and polynuclear aromatic hydrocarbons (PAHs).
    In the early 1970s, Allied Chemical constructed a wastewater 
treatment plant (WWTP) and a series of lagoons in the marshy area of 
the Coke Plant to treat the waste streams from the Coke Plant and the 
Tar Plant. The treated wastewater discharged to the Ohio River through 
two permitted outfalls, Outfall 001 and Outfall 002. Outfall 002 was 
taken out of service in 2001.
    In 1977, Allied Chemical sold the Coke Plant to the McClouth Steel 
Corporation (McClouth Steel). In 1982, McClouth Steel filed for 
bankruptcy and the Coke Plant was shut down.
    Iron City Fuels, Inc. (Iron City Fuels) purchased the Coke Plant 
property for salvaging after the Coke Plant closed. In 1984, Allied 
Chemical re-purchased the Coke Plant property, excluding the surface 
facilities, from Iron City Fuels. Iron City Fuels retained the surface 
facilities at the Coke Plant for salvaging until 1985.
    Iron City Fuels completed their salvage operations and transferred 
the surface facilities back to Allied Chemical in 1985. In 1987, Allied 
Chemical entered into a CERCLA Section 106(a) Administrative Order on 
Consent (AOC) with EPA and OEPA to remove six remaining above-ground 
storage tanks, 4,700 cubic feet of tar decanter sludge (a K087 
hazardous waste), and the material in the #4 weak liquor storage tank 
from the CPLA for off-site disposal.
    Allied Chemical operated the Tar Plant (0U3) from 1945 until 2000 
when the Tar Plant closed. The Tar Plant manufactured products from the 
crude tar produced at the Coke Plant. The Tar Plant contained 124 above 
ground storage tanks for various coal tar derivatives and chemicals, 
and numerous buildings housing administrative, laboratory, storage, and 
maintenance activities. After the Tar Plant closed, the Tar Plant 
facilities were demolished. The Tar Plant property demolition was 
completed in 2003.
    Specific products from the Tar Plant included: Phthalic anhydride, 
creosotes, pitches, naphthalene, road tar, driveway sealer, roofing 
pitch, and anthracene. The Tar Plant disposed the wastes and residues 
generated during the manufacturing processes to the adjacent GDA (OU1). 
These wastes included: Anthracene residues and salts, coal tar pitch 
scrap, and phthalic anhydride residues.
    The GDA was a former sand and gravel pit that was approximately 40 
feet deep. The GDA received waste from the Tar Plant, as well as waste 
from the sand and gravel company and foundry sand from a nearby iron 
foundry.
    Allied Chemical purchased the GDA property in 1955. In 1961, the 
construction of the Greenup Dam on the Ohio River raised the water 
levels of the river and adjacent groundwater, causing the waste at the 
bottom of the GDA to be in direct contact with the groundwater.
    Allied Chemical stopped using the GDA for waste disposal in 1977 
and developed a plan for closing the GDA in consultation with OEPA. The 
closure included: Removing standing liquid from the GDA for off-site 
disposal, filling the GDA to surface grade, and

[[Page 37766]]

capping the GDA with clay. Allied Chemical completed the GDA closure in 
1980.
    EPA inspected the Allied Chemical Site and completed a Site 
Inspection Report in 1980. In 1982, OEPA sampled the five Coke Plant 
lagoons and collected groundwater samples from the Site. OEPA detected 
high concentrations of PAHs in the lagoon sludge [total PAH 
concentrations as high as 148,000 milligrams per kilogram (mg/kg) in 
Lagoon 5] and high levels of cyanide, arsenic, phenol, and metals in 
the liquid fractions of the lagoons. OEPA detected arsenic in the 
groundwater at concentrations as high as 120,000 micrograms per liter 
([micro]g/l) and benzene at concentrations as high as 1,200 [micro]g/l.
    EPA completed a Preliminary Assessment Report and a Remedial Action 
Master Plan for the Site in 1983. EPA proposed the Site to the NPL on 
December 30, 1982 (47 FR 58476) due to the potential for groundwater 
contaminants to affect private well supplies, as well as the Ohio River 
and Ice Creek, which supply municipal drinking water. EPA finalized the 
Allied Chemical Site on the NPL on September 8, 1983 (48 FR 40658).
    EPA finalized: Cleanup remedies for the Allied Chemical Site in 
Records of Decision (RODs) issued in 1988, 1990, and 2007; ROD 
Amendments in 1995, 1997, and 1998; and Explanations of Significant 
Differences (ESD) in 2015 and 2020. Allied Chemical/Honeywell 
implemented the EPA-selected cleanup actions for the Site from 1993 to 
2015. In 2016, EPA issued a Preliminary Close Out Report documenting 
that Allied Chemical/Honeywell constructed the cleanup remedies 
consistent with all requirements and that the cleanups were protective 
of human health and the environment.
    The OU1 property (GDA) is currently owned by Honeywell. The 
majority of the OU1 property is a capped landfill and the perimeter is 
fenced. There is presently no anticipated future use for the portion of 
OU1 located over the landfill. Honeywell split approximately 1.4 acres 
of OU1 near Third Street that is not part of the landfill from the 
original parcel, and this property is available for redevelopment.
    The OU2 property (Coke Plant/Lagoon Area) is divided into 17 
parcels of land. Allied Corporation (i.e., Honeywell) currently owns 
two of the 17 parcels: Parcel 2, located in the City of Ironton and 
Parcel 1 located in the Village of Coal Grove (see Figure 2 in the 
Docket). Parcel 2 contains the former lagoons which were converted into 
wetlands and the upgraded WWTP that treats the extracted groundwater 
from the Site prior to discharge to the Ohio River. Parcel 2 is under 
security and monitoring by a Honeywell contractor stationed at the WWTP 
seven days a week during business hours and via telemetry 24 hours per 
day. Parcel 1 contains a portion of the Lagoon Area and a portion of 
Ice Creek. A section of Parcel 1 has also been converted into wetlands. 
The entire perimeter of the WWTP and the lagoons is secured by a chain-
link fence with posted warning signs maintained by Honeywell's 
contractors.
    Honeywell donated Parcel 4 of OU2 to the Ironton Port Authority in 
2008. Honeywell sold the remaining OU2 parcels to the City of Ironton 
(City) for use as an industrial park in 2002. The City sold various 
parcels of OU2 for redevelopment.
    The two OU3 parcels, the Main Parcel and the River Parcel, are 
currently owned by Honeywell/Allied Chemical. The Main Parcel is 
covered by a low-permeability cover and the perimeter is fenced. The 
River Parcel has a 2-foot soil cover and a sediment cover. The access 
road is gated to prevent vehicles from entering the area.
    In 2011, EPA's contractor performed a reuse assessment to identify 
future land use considerations and opportunities and to coordinate 
reuse goals for the Site. On September 22, 2011, EPA and the City 
hosted a workshop to plan for Site reuse. Participants included Site 
owners and representatives from local businesses, adjacent properties, 
local educational and healthcare institutions, and local and state 
government. During the workshop, participants gave input regarding 
future uses and priorities for the Site.
    In 2012, EPA's contractor completed a ``Reuse Framework'' report, 
which summarized the outcomes of the workshop and the findings of a 
reuse suitability assessment for the Site. This document includes reuse 
considerations and opportunities for education, workforce development, 
and Site improvements that can position the Site for productive reuse.
    Several of the OU2 Site parcels have been redeveloped. The 
ownership information for the OU2 parcels is summarized on Figure 2 in 
the Docket. The active stakeholders, their interests, and their contact 
information is summarized in Table 1 of the 2020 Institutional Controls 
Implementation & Assurance Plan, which is available in the Docket.
    This partial deletion pertains to the soil (land) portion of OU1 
(GDA); the soil (land) and lagoons portion of OU2 (CPLA), except for 
the OU2 ROD Soils Area 2 located within the bermed area of the East 
Tank Farm (see Figure 3 in the Docket); and all of OU3 (which only 
addressed contaminated soil and sediment at the Tar Plant and in the 
adjacent Ohio River).
    The OU2 ROD Soils Area 2 located within the bermed area of the East 
Tank Farm contains components of the groundwater treatment system and 
will not be remediated until after the groundwater cleanup is complete. 
Therefore, the OU2 ROD Soils Area 2 is not being considered for 
deletion as part of this action. The contaminated groundwater at the 
Site, which is present below all three OUs but is being addressed as 
part of the OU1 and OU2 cleanup remedies, is undergoing a long-term 
cleanup and is also not being considered for deletion as part of this 
action. The OU2 ROD Soils Area 2 and the groundwater portions of the 
Allied Chemical Site (i.e., the groundwater portion of OU1 and OU2, 
which includes the contaminated groundwater below OU3) will remain on 
the NPL.

Remedial Investigation and Feasibility Study (RI/FS)

    Allied Chemical entered into an AOC with EPA and OEPA to conduct a 
Site-wide Remedial Investigation (RI) and Feasibility Study (FS) at the 
Allied Chemical Site in 1984. The purpose of the RI was to characterize 
the nature and extent of contamination associated with the Site and the 
impact of the contamination on human health and the environment. The 
purpose of the FS was to develop and evaluate cleanup alternatives to 
address the unacceptable risks posed by the Site.
    Allied Chemical conducted field investigations at the Site in 1984 
and finalized the RI Report in 1986. The 1986 RI included: (1) The 
installation and sampling of over 45 groundwater monitoring wells; (2) 
collection and analysis of over 200 groundwater samples; (3) collection 
and analysis of over 200 soil samples; (4) collection and analysis of 
over ten surface water samples; (5) continuous sampling and analysis of 
air samples during sampling and excavation; (6) excavation and sampling 
of waste in over 20 test pits; and (7) collection and analysis of over 
1000 samples of fish tissue. The soil and waste samples were analyzed 
for six Site-specific indicator chemicals: Phenolics, benzene, 
naphthalene, cyanide, ammonia, and chloride. The groundwater and 
municipal water samples were analyzed for the six indicator chemicals 
and EPA's Target Analyte List (TAL) inorganic and Target Compound List 
(TCL) chemicals.
    The 1986 RI determined that the 4-acre waste pit in the GDA 
contained

[[Page 37767]]

approximately 300,000 cubic yards of waste material, including 
hazardous substances disposed from the Tar Plant and the Coke Plant. 
The bottom five feet of the waste was below the water table and in 
direct contact with groundwater. The surface of the GDA was a source of 
contamination because contaminated substances oozed up through the 
existing cap and collected on the GDA surface. The contaminants of 
concern (COCs) in the GDA were: Benzene, naphthalene, phenolics, 
cyanide, ammonia, sulfate, chloride, and the PAHs benz(a)anthracene, 
benzo(a)pyrene, chrysene, and dibenz(a,h)anthracene.
    The groundwater below the GDA was contaminated. The groundwater 
contamination extended west to the Ohio River and to the production 
wells located at the Amcast company (formerly Ironton Iron Inc.) 
located 1,000 feet north of the GDA. Amcast Production Well No. 7 
contained benzene at concentrations as high as 36 [micro]g/l. These 
concentrations were above the Safe Drinking Water Act Maximum 
Contaminant Level (MCL) for benzene of 5 [micro]g/l. Dense non-aqueous 
phase liquid (DNAPL) was present on top of the bedrock below the GDA. 
Total petroleum hydrocarbon concentrations in the DNAPL were 100 to 250 
parts per million. Due to the groundwater contamination, Allied 
Chemical began providing bottled drinking water to Amcast for its 
employees in 1986.
    The 1986 RI found seven areas of soil contamination in the Coke and 
Tar Plant areas that required cleanup (see Figures 3 and 4 in the 
Docket). The soils were contaminated with benzo(a)pyrene, a 
carcinogenic PAH (PAHc). The maximum concentrations of benzo(a)pyrene 
detected in the contaminated soil were: 150 mg/kg in Area 1, 60 mg/kg 
in Area 2, 330 mg/kg in Area 3, 96 mg/kg in Area 4, and 39 mg/kg in 
Area 5. The total amount of soils requiring cleanup in the Coke Plant 
area was 38,000 cubic yards. Approximately 2,000 cubic yards of soil 
required cleanup in the Tar Plant area.
    The 1986 RI found that Lagoons 1 through 4 in the CPLA contained 
waste coal and coke, and general debris, including bricks, pieces of 
metal, and tar. Lagoons 1 and 3 also contained lime kiln sludge (K060), 
a listed hazardous waste under the Resource Conservation and Recovery 
Act (RCRA) based on the content of cyanide, naphthalene, phenolic 
compounds, and arsenic. The analytical sampling indicated that the 
material in Lagoons 1 through 4 was contaminated with widely varying 
concentrations of PAHs, ammonia, cyanide, phenolics, sulfate, benzene, 
and arsenic.
    Lagoon 5 in the CPLA was used to dispose decanter tank tar sludge 
(K087), a RCRA listed hazardous waste based on phenol and naphthalene 
content. Lagoon 5 was also believed to contain waste coal and coke 
materials. Lagoon 5 was approximately 40 feet deep and contained 
approximately 122,000 cubic yards of waste. About five to 15 feet of 
the waste was below the water table. Analytical sampling in Lagoon 5 
detected high concentrations of carcinogenic PAHs. Although the 
solubility and mobility of PAHs is low, the chemicals are potent 
carcinogens.
    The 1986 RI found that the sediments of Ice Creek downstream from 
the Site were contaminated from the discharge of wastewater from the 
Coke Plant operations. The sampling indicated that downstream sediments 
contained Site-related concentrations of phenolics, naphthalene, 
ammonia, and cyanide. An examination of 214 fish collected from Ice 
Creek and the Ohio River, however, did not show any neoplastic liver 
lesions in the fish. Surface water samples collected downstream of the 
Site contained higher concentrations of chloride and ammonia than 
upstream samples, but the concentrations were well below EPA's Water 
Quality Criteria.
    The groundwater in the CPLA and the Tar Plant area was contaminated 
with several contaminants, including phenolics, ammonia, cyanide, 
chloride, naphthalene, and benzene. The pattern of groundwater 
contamination indicated that the contamination was due to a number of 
localized on-site sources. The data also indicate that DNAPL was 
present above the surface of the bedrock at some locations.
    Groundwater modeling conducted during the RI indicated that the 
groundwater below the CPLA and Tar Plant flowed toward Ice Creek and 
the Ohio River. The modeling indicated that the Coal Grove well field 
located approximately 2,000 feet south of the CPLA, which provides 
drinking water to about 2,840 residents, obtains approximately 27 
percent of its water from Ice Creek leakage, 29 percent of its water 
from the Ohio River, 41 percent of its water from the aquifer southeast 
of the well field away from the Site, and three percent of its water 
from Site groundwater flowing underneath Ice Creek. The modeling and 
the actual analysis of the Coal Grove municipal water indicated that no 
drinking water standards were being exceeded in the Coal Grove 
wellfield as a result of the Allied Chemical Site.
    The 1986 RI concluded that contaminated groundwater from the CPLA 
and Tar Plant was discharging to the Ohio River, but the discharge was 
not detectable since the river contained contaminants similar to those 
found in Site groundwater upstream and downstream of the Site. 
Contaminant loading modeling indicated that the groundwater 
contaminants discharging to the Ohio River would not be detectable at 
the City of Ironton's drinking water intake.
    Allied Chemical conducted air sampling during the 1986 RI during 
worst-case conditions by collecting air samples when the most highly 
contaminated material at the Site, the tar sludge in Lagoon 5, was 
disturbed with a backhoe. Allied Chemical did not detect any 
discernible atmospheric volatile organic emissions at the perimeter of 
the tar sludge area during this sampling.
    After the 1986 RI was complete, EPA, OEPA, and Allied Chemical 
divided the Site into two OUs to expedite the completion of the FS for 
the GDA (OU1). Allied Chemical completed an Endangerment Assessment and 
a FS Report for the GDA in 1988. Allied Chemical completed an 
Endangerment Assessment and a FS Report for the remaining areas of the 
Site (OU2) in 1990. The OU2 Endangerment Assessment and FS addressed 
the CPLA, contaminated groundwater below the Tar Plant, and limited 
areas of soil contamination at the Tar Plant.
    Allied Chemical's EA for the GDA examined potential contaminant 
exposure pathways from the GDA including ground water, surface water 
(Ohio River contamination via ground water), soil, and air. The 
potential receptors included Amcast workers drinking contaminated 
groundwater from Amcast's wells (if bottled water was not supplied), 
recreational users in the Ohio River ingesting surface water, and 
workers at the closest business inhaling airborne contaminants. The GDA 
was covered and fenced, so direct contact with the wastes was not 
considered a major exposure pathway.
    The OU2 EA for the CPLA (and some portions of the Tar Plant) 
evaluated potential risks to current Coal Grove residents from: 
Inhalation of downwind dust and vapors; dermal contact with and the 
incidental ingestion of water in Ice Creek while swimming; using Coal 
Grove municipal water for drinking and showering; incidental ingestion 
of contaminated soil while trespassing; and eating fish from Ice Creek. 
The EA also evaluated potential risks to hypothetical future residents 
living on the CPLA property and using the

[[Page 37768]]

contaminated groundwater as a water supply.
    The EA for the GDA determined that the contaminated groundwater 
from the GDA posed an unacceptable risk to people using the groundwater 
as a source of drinking water. The excess lifetime cancer risk was 6.7 
x 10-\3\. This risk was greater than EPA's acceptable cancer 
risk range of 1 x 10-\4\ to 1 x 10-\6\. The 
noncancer hazard index (HI) calculated for exposure to the GDA 
groundwater was 3.0, which is greater than EPA's acceptable noncancer 
HI of 1.0.
    Recreational use of the Ohio River did not pose a risk since 
sampling results did not indicate a significant increase of Site-
related contaminants in the Ohio River downstream of the GDA. Air 
modeling also indicated that potential air releases from the GDA did 
not pose a significant risk via the air pathway (an excess lifetime 
cancer risk of 1.6 x 10-\6\).
    The OU2 EA for the CPLA and portions of the Tar Plant identified 
unacceptable potential future risks to hypothetical residents living on 
the CPLA property. The potential future cancer risk was 5.7 x 
10-\3\ for children and 3.4 x 10-\3\ for adults. 
The unacceptable noncancer HIs were 7.1 for children and 4.0 for 
adults. The cancer risks were primarily due to the concentrations of 
PAHs in the soil and to benzene and arsenic in the groundwater. The 
unacceptable noncancer risks were primarily due to cyanide 
contamination in the groundwater.
    The CPLA EA did not identify any unacceptable risks to current Coal 
Grove residents. The total excess lifetime cancer risk calculated for 
Coal Grove residents from all exposure pathways was 1.0 x 
10-\5\ for children and 2.6 x 10-\5\ for adults. 
The calculated noncancer HIs for Coal Grove residents for all pathways 
were well below 1.0, with a maximum HI of 0.163.
    At the time of the OU1 and OU2 RI/FS, the Tar Plant was an 
operating facility with limited accessibility. In 2003, after the Tar 
Plant closed and the area could be fully investigated, Honeywell 
(formerly Allied Chemical) entered into a separate AOC with EPA to 
conduct a RI/FS for the remaining areas of the Tar Plant (OU3) that 
were not addressed or remediated as part of OU2. Honeywell completed 
the Tar Plant OU3 RI/FS in 2007 and issued an OU3 RI Addendum in 2008.
    The 2007 OU3 RI included: (1) The collection and analysis of 235 
soil samples from 146 soil borings down to the water table; (2) 12 
paired soil vapor and ambient air samples at locations of highest 
contaminant concentrations; (3) the installation and sampling of 48 
groundwater monitoring wells installed from 28 to 90 feet below ground 
surface (with 21 locations nested) to horizontally and vertically 
delineate the groundwater contamination; (4) the installation of 12 
DNAPL wells to delineate the extent and thickness of the DNAPL and 
allow for possible future recovery; and (5) the collection and analysis 
of 37 Ohio River water and 29 sediment samples to evaluate impacts to 
the river. Honeywell analyzed the 2007 RI samples for VOCs, PAHs, 
polychlorinated biphenyls (PCBs), cyanide, arsenic, total phenols, and 
ammonia. The groundwater samples were also analyzed for nitrate.
    Honeywell's 2007 RI for the Tar Plant (OU3) found that the shallow 
and deep soil on the Main Parcel of the Tar Plant was contaminated with 
high levels of PAHs (as high as 44,100 mg/kg) and benzene, toluene, 
ethylbenzene, and xylene (BTEX) (a maximum concentration of 406 mg/kg 
BTEX). The distribution of PAHs and BTEX in the shallow soil was 
similar to the distribution of the DNAPL. The soil also contained 
lesser concentrations of arsenic (maximum concentration of 14.4 mg/kg), 
PCBs (maximum concentration of 7.7 mg/kg total PCBs), phenols (280 mg/
kg), cyanide, and ammonia.
    Shallow soil in the River Parcel contained high levels of PAHs and 
BTEX. High levels of PAHs were also detected in sediment samples 
collected from the Ohio River adjacent to the Site. The highest 
concentrations of PAHs in sediment were located downstream of Outfall 
001 and ranged from 184 mg/kg to 1,053 mg/kg.
    Soil vapor in the Tar Plant OU contained benzene at concentrations 
as high as 55,000 parts per billion/volume (ppbv) and other VOCs. 
Benzene (maximum concentration of 0.31 ppbv), toluene, and naphthalene 
were detected in ambient air.
    DNAPL is present in the southern half of the Main Parcel of the Tar 
Plant and has collected in depressions at the surface of the bedrock. 
The soil boring data indicates that the DNAPL has not, and is not 
likely to, migrate toward the Ohio River due to rises in the surface of 
the bedrock between the Site and the river.
    Honeywell completed a Human Health Risk Assessment (HHRA) and a 
Screening Ecological Risk Assessment (SERA) for the Tar Plant (OU3) in 
the 2007 Phase 1A RI Report. The HHRA evaluated risks to current 
trespassers and to future recreational visitors, indoor and outdoor 
commercial/industrial workers, and construction workers. The HHRA 
evaluated exposure pathways including dermal contact with and the 
incidental ingestion of surface and subsurface soil, dust inhalation, 
the inhalation of ambient air and indoor contaminants via vapor 
intrusion, dermal contact with and the incidental ingestion of surface 
water, dermal contact with sediment, and the ingestion of groundwater. 
The SERA evaluated potential impacts to ecological receptors from 
exposure to soil and to surface water and sediment in the Ohio River 
adjacent to the Site.
    Honeywell's 2007 OU3 HHRA indicated that the Tar Plant posed an 
unacceptable risk to current trespassers, future recreational users, 
future indoor and outdoor commercial/industrial workers, and future 
construction workers. The total excess lifetime cancer risks ranged 
from 8 x 10-\4\ to 8 x 10-\3\. The noncancer HIs 
ranged from 2 to 1201. The majority of the cancer and noncancer risks 
were posed by PAHs in the surface and subsurface soil and by 
concentrations of benzene, toluene, and naphthalene in soil vapor.
    The results of the 2007 OU3 SERA indicated that the concentrations 
of PAHs in the Tar Plant soil posed a hazard to soil invertebrates, 
worm-eating birds, and predatory birds. Ecological hazard quotients 
(HQs) greater than or equal to 100 were calculated in scattered areas 
across the Tar Plant. The SERA also indicated that the concentrations 
of COCs detected in surface water could cause adverse effects to 
aquatic receptors. Additionally, the concentrations of Site-related 
PAHs in sediment could cause adverse effects to benthic organisms 
(direct contact) and piscivorous birds (food chain).
    Allied Chemical and Honeywell conducted Feasibility Studies (FSs) 
to develop and evaluate cleanup alternatives to address the 
unacceptable risks associated with the GDA, the CLPA, and the Tar Plant 
OUs.
    The 1988 OU1 FS evaluated four cleanup alternatives for the GDA: No 
action; slurry wall and cap with groundwater recovery wells inside and 
outside of slurry wall; incinerate GDA waste and return residual 
material to GDA, with slurry wall with groundwater recovery wells 
inside and outside of slurry wall (no cap); and incinerate GDA waste 
and subsoils with one groundwater recovery well (no slurry wall or 
cap). All alternatives except the no-action alternative also included 
groundwater treatment at the on-site WWTP with discharge to the Ohio 
River under the existing or a modified NPDES permit, connecting Amcast 
to the

[[Page 37769]]

municipal water supply, and a DNAPL investigation.
    Allied Chemical completed the OU2 FS for the CPLA in 1990. The OU2 
FS evaluated varying combinations of cleanup options for the CPLA. 
Cleanup options for the lagoons and contaminated Coke Plant and OU2 Tar 
Plant soils included: No action; on-site incineration and off-site 
waste fuel recovery; partial bioremediation with on-site incineration; 
partial bioremediation and off-site waste fuel recovery; partial off-
site waste fuel recovery with solidification/stabilization of residual 
materials; and partial bioremediation with on-site waste fuel recovery 
of lagoon materials and an asphalt and plastic layered cap over the 
Coke Plant and OU2 Tar Plant soils.
    Ice Creek sediment cleanup options included: Monitoring with 
trigger levels for accelerated monitoring and groundwater remediation; 
excavation and bioremediation of Ice Creek sediments with lagoon 
materials; and solidification/stabilization of Ice Creek sediments. All 
cleanup alternatives included groundwater collection with treatment at 
the on-site WWTP with discharge to the Ohio River.
    Honeywell completed the Tar Plant OU3 FS in 2007. The 2007 FS 
evaluated eight cleanup alternatives for the contaminated Tar Plant 
soils, two cleanup alternatives for air, and five cleanup alternatives 
for Site-related sediment contamination in the Ohio River. The soil 
alternatives included: No further action; soil cover; low-permeability 
cover; limited excavation and off-site disposal with either a soil 
cover or a low-permeability cover; limited excavation with on-site 
consolidation and a soil cover or a low-permeability cover; and 
extensive excavation and off-site disposal.
    The cleanup alternatives evaluated for the contaminated sediment 
included: No further action; monitored natural recovery; in-situ 
capping; dredging and off-site disposal; and a combination of dredging, 
off-site disposal and in-situ capping. The cleanup alternatives 
evaluated for the air were no further action and institutional controls 
(ICs).

Selected Remedy

    EPA selected cleanup remedies for the Allied Chemical Site in RODs 
EPA issued in 1988, 1990, and 2007. EPA issued three ROD Amendments 
modifying the remedy in 1995, 1997, and 1998. EPA documented additional 
changes to the remedy in ESDs EPA issued in 2015 and 2020.
    EPA selected the OU1 GDA cleanup remedy in the 1988 ROD. The 
remedial action objectives (RAOs) for the GDA are to: Mitigate the 
future generation of contaminated leachate; mitigate the GDA-related 
contamination of the Amcast potable/sanitary water supply and any other 
private well supplies located north and northwest of the GDA; mitigate 
the migration of GDA-related contaminants above applicable Ohio River 
standards into the Ohio River (Ohio Administrative Code 3745-1-32); and 
mitigate the potential for direct or indirect contact by the public 
with hazardous substances in the buried GDA waste.
    The major components of the selected GDA remedy included: 
Constructing a low-permeability slurry wall around the GDA from the 
ground surface into the low-permeability bedrock; installing a multi-
media RCRA hazardous waste cap over the GDA; continuous extraction of 
groundwater within the containment system with treatment at the 
existing on-site WWTP located at the CPLA (to be upgraded) to create an 
inward groundwater gradient within the slurry wall boundaries; 
extraction and treatment at the on-site WWTP of contaminated 
groundwater outside the containment system until cleanup standards are 
achieved; municipal water hook-up for in-plant potable and sanitary 
uses at the Amcast facility until contaminant levels in groundwater 
meet the cleanup standards; deed restrictions to limit future uses of 
the disposal area portion of the property; and a supplemental RI/FS to 
identify the nature and extent of the DNAPL, develop and evaluate 
cleanup alternatives, and implement the EPA-approved DNAPL remedy, if 
different from the currently selected containment alternative.
    EPA selected the cleanup remedy for the CPLA in the 1990 ROD. The 
RAOs for the CPLA cleanup are to: Mitigate the potential for direct or 
indirect contact of the public with the lagoon area wastes; mitigate 
the potential for future mobilization of contaminants into the 
groundwater; mitigate the migration of CPLA-related contaminants into 
Ice Creek, the Ohio River, and the Coal Grove well field; and remediate 
all contaminated media to meet ARARs and acceptable risk-based levels 
for human health and the environment.
    The major components of the selected CPLA remedy in the 1990 ROD 
were: Excavate the entire volume of Lagoon 5 (122,000 cubic yards of 
material); on-site incineration and waste fuel recovery (heat reuse) of 
Lagoon 5 material and 31,000 cubic yards of waste coal excavated from 
the coal overburden area, with the ash to be disposed of at a permitted 
off-site solid waste facility; excavation and bioremediation on a 
prepared pad of 40,000 cubic yards of Coke and Tar Plant soils (OU2 ROD 
Soils Areas 1 to 7); in-situ bioremediation of the remaining volume of 
material in Lagoons 1 through 4 (475,000 cubic yards), the residual 
soil in Lagoon 5, and the adjacent inner and outer dikes; monitoring 
the Ice Creek area and developing a contingency plan in the event that 
contaminant migration is encountered; groundwater collection, on-site 
treatment with the groundwater from the GDA, and monitoring; and deed 
restrictions and fencing.
    The 1990 CPLA ROD stated that the cleanup standard for soil was 
0.97 mg/kg of PAHc. The standard was based on an excess lifetime cancer 
risk of 1 x10-\6\ assuming a direct contact residential land 
use exposure. The CPLA ROD also provided for an alternative cleanup 
standard of 97 mg/kg PAHc (a 1 x 10-\4\ cancer risk, which 
is still within EPA's acceptable risk range) if the threat of direct 
contact from lagoon soils through residential land use was eliminated 
by flooding Lagoons 1 through 4 to create a wetland. An assessment of 
Lagoons 1 through 4 indicated that this area was more likely to be an 
ecological area than a residential area due to its proximity to Ice 
Creek and the fact that this low-lying area has historically served as 
a flood water storage area.
    EPA issued ROD Amendments in 1995, 1997 and 1998 modifying the 
cleanup remedies for the GDA and CLPA based on additional information 
collected during the predesign and design phases of the project. The 
three ROD Amendments modified the OU1 and OU2 remedies as follows: 
Revised the groundwater clean-up standards for benzo(a)pyrene and 
dibenz(a,h)anthracene for OU1 and OU2 from 0.005 [micro]g/l total to 
the new MCLs of 0.2 [micro]g/l for benzo(a)pyrene and 0.3 [micro]g/l 
for dibenz(a,h)anthracene; selected excavation and on-site storage for 
eventual treatment or placement into the lagoon area for 135,000 
additional cubic yards of CPLA soil found to be contaminated with PAHs 
during the design phase; replaced prepared-pad bioremediation of 40,000 
cubic yards of CPLA soil with off-site disposal in an approved 
landfill; replaced in-situ bioremediation of 475,000 cubic yards of 
material in Lagoons 1 through 4 with excavation of materials above 97 
mg/kg PAHc and wetland development; and replaced incineration of Lagoon 
5 materials with recycling, treatment, and/or disposal of the K087 
listed waste in an approved off-site hazardous waste facility and the 
use of the remaining material, excluding debris, as an alternative 
fuel.

[[Page 37770]]

    In 2020, EPA issued an ESD for the OU2 CPLA remedy. EPA issued the 
ESD to formally document a previously accepted change in the soil 
cleanup standard for arsenic from a residential cleanup level of 0.56 
mg/kg selected in the 1990 OU2 ROD to a Site-specific background 
concentration of 15 mg/kg calculated during the remedial design (RD) 
phase of the project. See the Cleanup Levels section of this notice for 
additional information.
    EPA issued the Tar Plant OU3 ROD in 2007. The OU3 ROD addressed 
contaminated soil, sediment and air at the Tar Plant OU. The RAOs for 
OU3 assumed that future use of the Tar Plant property would be 
commercial/industrial and may include riverside parks or other 
recreational use.
    The RAOs for the Tar Plant soil are to: Prevent human ingestion and 
direct contact with soil containing PAHs at concentrations that exceed 
applicable NCP and Ohio EPA risk management criteria for applicable 
exposure scenarios; prevent terrestrial invertebrates from being 
exposed to PAHs at concentrations that may be harmful to invertebrates 
and worm-eating birds; prevent predatory birds from being exposed to 
unacceptable concentrations of PAHs; and reduce, to the extent 
practicable, contaminant leaching from soil that may contribute to 
groundwater contamination above NCP and/or Ohio EPA risk management 
criteria.
    The RAOs for sediment in the adjacent Ohio River are to prevent 
human direct contact with sediment containing PAHs that exceed 
applicable NCP and Ohio EPA risk management criteria for future 
exposure scenarios, and to prevent benthic invertebrates from direct 
contact with sediment containing PAHs that exceed preliminary 
remediation goals based on background toxicity levels. The RAOs for air 
are to prevent the inhalation of vapors in indoor air in future 
buildings in excess of NCP and Ohio EPA risk management criteria and to 
prevent the inhalation of vapors by construction workers during any 
future grading and/or excavation activities.
    EPA's selected cleanup remedy for soil in the 2007 OU3 ROD was the 
construction of an OEPA-compliant low-permeability solid waste cap over 
all contaminated portions of the Tar Plant (the entire 16-acre Main 
Parcel), a geotextile fabric and soil cover over all contaminated 
portions of the River Parcel (approximately four acres), ICs to protect 
the integrity of the cap and soil cover, and an IC implementation plan. 
EPA did not select a low-permeability cap for the River Parcel based on 
concerns with hydraulic instability caused by hydrostatic pressure 
differences between the groundwater and surface water which could cause 
a low-permeability cover to fail.
    The selected OU3 remedy for sediment consisted of dredging 
approximately 3,300 to 5,100 cubic yards of contaminated sediment from 
the Ohio River using appropriate dredging techniques and turbidity 
control measures; sediment dewatering and disposal at an approved off-
site landfill; evaluating the water from the dewatered sediment during 
the RD for disposal at the on-site WWTP; and installing an in-situ cap 
over approximately 0.7 acres of residual sediment contamination using 
earthen materials (sand, gravel and/or cobbles), engineered materials 
(geosynthetics or marine mattresses), or a combination of these 
materials to be determined during the RD. The exact areas and volume of 
sediment to be excavated and capped would be determined based on 
additional data collected and evaluated during the RD and post-dredging 
confirmation sampling.
    The selected OU3 remedy for air was ICs in the form of land use 
restrictions restricting the land to industrial/commercial use and 
requiring future buildings to include measures (e.g., physical 
barriers, venting, monitoring) to protect indoor workers against 
potential risks from vapor intrusion and outdoor workers during 
excavation or grading activities.
    In 2015, EPA issued an ESD modifying the sediment component of the 
OU3 remedy based on Honeywell's 2009 and 2011 predesign investigations. 
The predesign investigations indicated that the volume of sediment 
requiring excavation increased from 3,300 to 5,100 cubic yards to 
50,000 to 60,000 cubic yards, and that the area of sediment requiring 
capping was 2.3 acres, not 0.7 acres. Due to the significant increase 
in cost and concerns with potential river bank failure and the 
destabilization of the adjacent active railroad trackbed, the sediment 
component of the OU3 remedy was modified from dredging and capping to 
capping only.

Response Actions

    Allied Chemical completed the RD for the GDA remedy in 1992 and 
constructed the GDA remedial action (RA) from 1993 to 1995 (see Figures 
2 and 5 in the Docket). Allied Chemical constructed a soil-bentonite 
slurry wall around the GDA waste to provide a low-permeability barrier 
to ground water in-flow and contaminant migration out-flow. The slurry 
wall has a permeability of approximately 1 x 10-8 
centimeters per second (cm/sec), which exceeds the 1 x 10-7 
cm/sec permeability requirement. Allied Chemical did not key the slurry 
wall into the bedrock due to concerns that the keying efforts would 
fracture the bedrock and affect its competence and water-bearing 
capabilities.
    After the slurry wall was constructed, Allied Chemical installed a 
RCRA Subtitle C hazardous waste compliant cap over the GDA. The cap 
incorporated a geosynthetic clay liner to minimize future exposure of 
the buried waste and infiltration. The cap has a permeability of less 
than 1 x 10-7 cm/sec. The cap includes a passive gas venting 
system with capabilities for adding an emissions control system in the 
future, if needed.
    Allied Chemical installed two groundwater pumping wells inside the 
slurry wall (PW-3 and PW-4) to maintain an inward hydraulic gradient 
and prevent groundwater contaminants from migrating beyond the slurry 
wall, and two groundwater pumping wells outside the slurry wall (PW-1 
and PW-2) to intercept and extract contaminated groundwater outside the 
wall. Based on the 1992 Design Report and Allied Chemical's 1992 Design 
Report Response, EPA revised the groundwater drawdown required to 
maintain the inward gradient from ten feet to one foot. The groundwater 
pumped from inside and outside the slurry wall is treated at the on-
site WWTP at the CPLA, which was upgraded to add biological and carbon 
polishing treatment components to the system. The on-site WWTP was 
later upgraded again in 1997 during the OU2 RA. The treated groundwater 
is discharged to the Ohio River in compliance with the technical 
requirements of a Site-specific National Pollutant Discharge 
Elimination System (NPDES) permit administered by OEPA.
    Allied Chemical installed groundwater monitoring wells to monitor 
the performance of the GDA containment system and the migration of the 
dissolved and free phase contaminant plumes to assist with delineating 
the extent of DNAPL and to evaluate potential technologies to address 
the DNAPL. Allied Chemical also constructed a security fence around the 
perimeter of the GDA to prohibit trespassing. EPA conducted a final 
inspection of the OU1 GDA remedy on August 2, 1995. Allied Chemical 
submitted a final Remedial Design/Remedial Action (RD/RA) completion 
report for the GDA on September 14, 1995.

[[Page 37771]]

    Allied Chemical conducted preliminary Site preparation activities 
for the OU2 CPLA RA from 1994-1995. In 1995, Allied Chemical 
constructed the CPLA Stormwater Collection/Management System to contain 
stormwater runoff during the RA. Allied Chemical conducted the OU2 CPLA 
RA construction activities from 1996 to 2002 (see Figures 3, 4 and 6 in 
the Docket).
    Allied Chemical completed the OU2 CPLA groundwater remedy in 1996 
and 1997. The RA for the groundwater remedy included: Installing five 
groundwater extraction wells and five new groundwater monitoring wells 
to supplement the existing system; connecting a sixth groundwater 
extraction well installed in 1992 to the system; and modifying the on-
site WWTP to allow for the handling and treatment of the extracted 
groundwater from the CPLA, the GDA, and the wastewater from the Tar 
Plant facility operations and to meet NPDES permit requirements. The 
WWTP modifications included: Installing an iron/suspended solids 
removal system consisting of aeration/pH adjustment, clarification, and 
sand filtration; a cyanide removal system using ultraviolet 
irradiation/oxidation; and flow modifications to the carbon towers 
organics treatment system. Formal system start-up of the OU2 CPLA 
groundwater treatment system occurred in June and July 1997.
    Allied Chemical conducted the Lagoon 5 remediation activities from 
1998 to 1999. Allied Chemical excavated the material in Lagoon 5 down 
to the underlying clay layer and removed approximately 120,000 tons of 
waste from the lagoon. Approximately 85,600 tons of coal/coke fines, 
16,000 tons of segregated hard tar, and 500 tons of exempted RCRA-K087 
listed waste from Lagoon 5 were shipped off-site to power generation 
plants for feedstock as part of approved alternative fuels programs. 
Allied Chemical disposed of the contaminated or unusable hard debris 
(10,800 tons) and soft debris excavated from Lagoon 5 at an off-site 
landfill. Allied Chemical stabilized 7,100 tons of soft-tar material 
(RCRA K087 listed waste) from Lagoon 5 on-site and disposed of it at an 
off-site landfill. Allied Chemical sent the scrap metal that was 
recovered from Lagoon 5 to a local recycler.
    Allied Chemical backfilled the Lagoon 5 excavation with clean, hard 
debris from previous Site remediation activities (e.g., concrete pipe 
supports, brick, and concrete) to an elevation above the water table. 
The hard debris was covered with 12,000 tons of crushed hard debris and 
27,200 tons of soil having PAHc and arsenic concentrations below the 97 
mg/kg and 15 mg/kg cleanup levels excavated from other Site areas. 
Allied chemical seeded and revegetated Lagoon 5, and placed rip-rap 
along the sides of the lagoon at the tie-ins with the City of Ironton 
Floodwall.
    Based on the results of additional sampling conducted in Lagoons 1 
to 4 in 1997, the Lagoon 2 materials were the only materials with PAHc 
concentrations above the alternate 97 mg/kg PAHc cleanup standard 
documented in ROD Amendment #3 that required excavation. Allied 
Chemical removed 8,300 tons of hard tar and 1,200 tons of coal/coke 
fine materials from Lagoon 2 in 1999 and shipped the material to off-
site energy generators for feedstock. Allied Chemical backfilled the 
excavated areas in Lagoon 2 with 2,000 tons of clay material excavated 
from Lagoon 5 that had PAHc concentrations less than 97 mg/kg and 
arsenic concentrations less than 15 mg/kg. Allied Chemical placed a 
six-inch layer of imported fill material over the excavated area then 
tapered and sloped the sidewalls of Lagoon 2 downward into the 
partially backfilled area to create a depression to facilitate the 
collection of standing water to aid in the development of the wetland 
ecosystem.
    Allied Chemical conducted a Reconnaissance Ecological Risk 
Assessment for Lagoons 1 to 4 in 1999 before the lagoons were converted 
into wetlands. The assessment evaluated potential ecological impacts 
from residual PAHc concentrations in the Lagoons 1 to 4 materials after 
the Lagoon 2 materials were removed. Allied Chemical's 1999 assessment 
followed EPA's Sediment Quality Triad Approach and included a 
vegetation study. The assessment indicated that residual concentrations 
of PAHc in Lagoons 1 to 4 at concentrations less than or equal to the 
alternate 97 mg/kg cleanup level would not significantly impact the 
planned wetland ecosystem or the aquatic or vegetative communities of 
the converted wetland areas.
    Allied Chemical completed the conversion of Lagoons 1 to 4 into 
wetlands in 2002. The wetland conversion included: Construction of an 
overflow weir adjacent to Lagoon 4 and placement of rip-rap (i.e., 
brick and concrete) in selected areas to minimize erosional effects 
during flood events; permanent modification of the sluice gate adjacent 
to Lagoon 3 to permit complete hydraulic connection with Ice Creek to 
allow for equalized inflow/outflow during flood events; and adoption of 
an annual monitoring program to evaluate the re-establishment of 
vegetation and assess the condition of the biological community.
    Allied Chemical completed the OU2 soil remediation of the CPLA and 
OU2 Tar Plant soils, with the exception of the soil in OU2 ROD Soils 
Area 2, in 2000 (see Figures 3 and 4 in the Docket). The contaminated 
CPLA soils (OU2 ROD Soils Areas 1, 3 and 4) were excavated to a maximum 
depth of ten feet. The OU2 Tar Plant soils (OU2 ROD Soils Areas 5 to 7) 
were excavated to five feet and were not fully characterized due to the 
ongoing Tar Plant operations. The remaining Tar Plant soils were later 
addressed by Honeywell during the OU3 Tar Plant investigation and 
cleanup.
    The CPLA OU2 ROD Soils Area 2 could not be remediated because this 
area is located within the bermed area of the East Tank Farm which 
contains components of the WWTP for the long-term OU1 and OU2 
groundwater cleanup. The soil within OU2 ROD Soils Area 2 will remain 
on the NPL and is not included in this partial deletion action. OU2 ROD 
Soils Area 2 is located within the fenced portion of CPLA Parcel 2 
which is owned by Allied Chemical/Honeywell. The area is planned for 
future characterization and remediation when decreased activity levels 
in this area will minimize potential disruption to the operations of 
the ongoing groundwater cleanup. It is expected that the OU2 ROD Soils 
Area 2 materials will be characterized, excavated, and disposed of at 
an off-site landfill.
    Allied Chemical disposed the excavated OU2 CPLA and Tar Plant soils 
as non-hazardous solid waste in an off-site landfill in accordance with 
ROD Amendment #2. The excavated soils included: 18,100 tons of soil 
from CPLA ROD Soils Area 1; 4,000 tons of soil from CPLA ROD Soils Area 
3 and the active Truck Scale Facility; 2,600 tons of soil from CPLA ROD 
Soils Area 4; and 4,700 tons of soil from OU2 Tar Plant ROD Soils Areas 
5 to 7.
    During the OU2 RA, Allied Chemical excavated contaminated soil and 
materials from additional areas of the CPLA in accordance with the 1995 
ROD Amendment #1 (see Figure 3 in the Docket). These included: 
Excavating 44,000 tons of surficial coal fines accumulated from the 
off-loading of feed materials for the coke oven batteries for off-site 
use as an approved alternative fuel at cement kiln facilities and power 
generation plants; excavating 17,700 tons of fuel-grade overburden 
materials from the western portions of Lagoons 2 and 4 for off-site 
energy

[[Page 37772]]

recovery; excavating 6,000 tons of petroleum hydrocarbon-contaminated 
soil from the former Coke Plant Ammonia Concentration Building for off-
site disposal as a non-hazardous solid waste; excavating 23,500 tons of 
PAH-contaminated soils west and south of the former coke oven batteries 
and other Site areas and disposing the soil with PAHc concentrations 
greater than 97 mg/kg or arsenic concentrations greater than 15 mg/kg 
at an off-site landfill as a non-hazardous wastes (3,700 tons) and 
backfilling the remaining soil into the Lagoon 5 excavation; excavating 
3,500 tons of contaminated soil from the Trucker's Parking Lot area and 
an area located adjacent to the East Tank Farm and backfilling the 
material into Lagoon 5; excavating 35,000 tons of coal and coke fines 
and 500 tons of hard tar from the slope of the City of Ironton 
floodwall for off-site use as alternative fuel; excavating 63,000 tons 
of material with measured concentrations of PAHc less than 97 mg/kg and 
arsenic less than 15 mg/kg from the East Side Batteries Area for use as 
backfill along the toe of the City of Ironton floodwall slope and 
excavating 8,600 tons of material from this area for off-site energy 
recovery; and disposing 13,000 tons of hard debris (brick and concrete) 
and 500 tons of soft debris (wood, plastic, trash, etc.,) encountered 
in excavated areas as a non-hazardous solid waste at an off-site 
landfill. Allied Chemical completed these cleanup actions in 2000.
    Documentation of the OU2 RA construction activities is provided in 
the October 23, 2002 Interim Remedial Action Report for Coke Plant/
Lagoon Area (CPLA) Operable Unit at the Honeywell-Ironton Facility, 
which is available in the Docket.
    Honeywell initiated OU3 construction activities (see Figure 7 in 
the Docket) in 2014 starting with the River Parcel. Honeywell conducted 
Site preparation activities and sealed eight groundwater monitoring 
wells. Honeywell cleaned out and demolished a concrete oil-water 
separator type structure at the top of the river bank and removed its 
associated piping and waste material for off-site disposal. Honeywell 
relocated the CPLA WWTP outfall, Outfall 001, which discharged to the 
Ohio River near the demolished structure, to a discharge located on 
Site at the south property boundary. Honeywell constructed a new storm 
water system for the Main Parcel with direct discharge to the Ohio 
River using former NPDES outfall structures 001 and 002.
    Honeywell stabilized the riverbank at the soil and sediment 
interface of the River Parcel with 35,150 square feet of one-foot thick 
stone-filled Polymeric Marine Mattresses (PMMs) and rip-rap mixed with 
soil staked with live plant stakes. The PMMs were installed from 
elevation 512 feet to 515 feet. The rip-rap was installed from 
elevation 515 feet to 519 feet with some overlap on the PMMs. Honeywell 
placed the live plant stakes in the rip-rap/soil every three feet on 
center.
    Honeywell removed 75 tons of debris from the Ohio River and 
installed three separate types of subaqueous sediment caps covering a 
total of 2.3 acres in the river. Cap A covers the majority of the area 
and consists of a minimum six-inch sand chemical isolation layer 
covered by a minimum six-inch gravel erosion protection and filter 
layer. Caps B and C have the same sand and gravel layers as Cap A but 
are covered with an additional 12-inches (Cap B) and 18-inches (Cap C) 
of a cobble erosion protection layer.
    Honeywell installed a soil cover over the upland portion of the 
River Parcel (i.e., the riverbank) to prevent direct contact with 
affected soils by humans and potential ecological receptors. The soil 
cover consisted of 18 inches of vegetative fill covered by six inches 
of topsoil. Honeywell installed an orange geogrid layer below the 
vegetative fill to demarcate the underlying subgrade material.
    Honeywell installed coir (coconut fiber) matting over the topsoil 
from the top of the upland slope to the rip-rap at the bottom of the 
slope and coir logs at the base of the slope, between the soil cover 
and the rip-rap, to prevent erosion until the vegetation was 
established. Honeywell installed a temporary irrigation system and 
planted a mixture of native grasses, sedges and forbs on the sloped 
soil cover from elevation 519 (the top of the rip-rap) to elevation 547 
(the bottom of the railroad embankment), and container plants (trees 
and shrubs) every ten feet on center from elevation 519 to elevation 
538. Honeywell installed a gravel access road and gate near the top of 
the slope just above the 10-year flood elevation (about 535 feet). 
Honeywell completed the River Parcel remediation and restoration in 
2015.
    Honeywell conducted the remedial action construction for the OU3 
Main Parcel in 2015. Honeywell demolished the remaining buildings and 
structures on the Main Parcel and sealed 51 groundwater monitoring 
wells and one pumping well. Honeywell installed a low-permeability 
solid waste-compliant cap over the entire 16-acre Main Parcel area (see 
Figure 7 in the Docket). The low permeability cap consists of a six-
inch sand cushion layer over the contaminated soil covered by (from the 
bottom up): A geosynthetic clay liner (GCL), a 40-mil low-density 
polyethylene (LDPE) geomembrane layer, a 12-inch sand drainage layer 
with lateral underground drains to remove water from the top of the 
LLDPE, a 12-inch protective soil cover layer for vegetative growth, and 
six inches of topsoil.
    Honeywell installed a gas venting system below the cover system to 
prevent any buildup of gas. The system includes lateral gas collection 
pipes installed under the six-inch bottom sand cushion layer that are 
connected to three gas vents along the western edge of the cover. 
Honeywell installed soil gas monitoring probes around the perimeter of 
the cap. The gas monitoring probes are spaced approximately 400 feet 
apart with screens set at 10 feet, 25 feet, and 40 feet below grade.
    Honeywell seeded and mulched the topsoil layer of the cover system, 
constructed a gravel access road along the southern and eastern 
boundaries of the Main Parcel to provide access to groundwater 
extraction wells, and constructed a chain-link fence along the 
perimeter of the Main Parcel, except along South Third Street where an 
ornamental fence was installed.
    EPA, OEPA, and Honeywell conducted a pre-final/final inspection of 
the River Parcel on November 13, 2014 and a pre-final/final inspection 
of the Main Parcel on December 16, 2015. Documentation of the OU3 RA 
construction activities is provided in the March 2016 Final Remedial 
Action Completion Report for OU3 which is available in the Docket.
    EPA, OEPA, and EPA's contractors provided oversight of the cleanup 
at the Allied Chemical Site throughout the OU1, OU2, and OU3 RD/RAs. 
EPA and OEPA conducted a pre-final inspection of the Allied Chemical 
Site on December 19, 2015. During the inspection EPA verified that all 
remedial actions were conducted in accordance with the approved RD 
plans and specifications. A punch list of outstanding activities was 
prepared during the inspection. Honeywell addressed and completed all 
of the punch list activities by May 4, 2016. A final OU3 inspection and 
Site walk-through was conducted on June 1, 2016. EPA completed a 
Preliminary Close Out Report for the Site documenting that the RA 
construction activities were complete on September 29, 2016.

Cleanup Levels

    The soil (land) remedy for the OU1 GDA is in-situ containment of 
the waste disposal area; therefore the 1988 OU1

[[Page 37773]]

ROD does not establish cleanup levels for the GDA waste.
    EPA established the cleanup levels for the OU2 CPLA soil in the 
1990 OU2 ROD. The OU2 soil cleanup levels applied to soil, the 
materials in Lagoons 1 to 4, the soil remaining in Lagoon 5 after the 
removal of the Lagoon 5 waste, and the adjacent dikes. The OU2 CPLA 
soil cleanup levels were a total PAHc concentration of 0.97 mg/kg and 
an arsenic concentration of 0.56 mg/kg. These cleanup levels are based 
on a hypothetical residential exposure, with the cumulative cancer risk 
level not to exceed 1 x 10-6. The 1990 OU2 ROD also required 
ICs in the form of deed restrictions to prevent any residential or 
recreational use of the Site.
    In March 1995, Allied Chemical submitted a petition to EPA and OEPA 
providing a statistical evaluation of arsenic concentrations measured 
at the Site during the 1994 CPLA predesign investigations compared to 
regionally established background concentrations of arsenic. This 
petition resulted in the Agencies' adoption of a revised cleanup level 
for arsenic in soil of 15 mg/kg. This revised cleanup standard for 
arsenic was identified in several Site reports including the EPA and 
OEPA-approved 2002 Interim Remedial Action Report for the Coke Plant/
Lagoon Area and EPA's 2004 Five-Year Review report for the Site.
    Allied Chemical recorded Environmental Deed Restrictions 
prohibiting residential and recreational use of the CPLA property with 
the Lawrence County Recorder's office on August 22, 2002 in Plat Book 
10/Page 181. EPA formally documented the revised soil cleanup standard 
for arsenic of 15 mg/kg in an ESD EPA issued in May 2020.
    EPA revised the PAHc cleanup level for the Lagoons 1 to 4 material 
in ROD Amendment #3 in 1998. ROD Amendment #3 selected the alternate 
cleanup level of 97 mg/kg for PAHc provided in the 1990 OU2 ROD. The 
1990 OU2 ROD allowed the 97 mg/kg PAHc alternate cleanup level if the 
threat of direct contact with the lagoon materials through residential 
use was eliminated by flooding Lagoons 1 to 4 to create a wetland. The 
1999 Reconnaissance Ecological Risk Assessment that Honeywell conducted 
before converting Lagoons 1 to 4 into a wetland further indicated that 
the residual concentrations of PAHc in Lagoons 1 to 4 at concentrations 
less than or equal to the alternate 97 mg/kg cleanup level would not 
significantly impact the planned wetland ecosystem or the aquatic or 
vegetative communities of the converted wetland areas.
    EPA selected cleanup levels for the OU3 Tar Plant soil and Ohio 
River sediment in the 2007 OU3 ROD. The cleanup level for soil on the 
Main Parcel and the River Parcel of the Tar Plant is 0.16 mg/kg of 
benzo(a)pyrene. This cleanup level is based on a cancer risk of 1 x 
10-6 under future industrial/commercial and recreational use 
of the property.
    The cleanup level for the Ohio River sediment in the 2007 ROD was 
total PAH concentrations that are equal to or less than background 
sediment toxicity levels for aquatic receptors (benthos) in sediment 
from upstream sources. That is, the ROD required the sum of 
Environmental Sediment Toxicity Benchmark Units (ESTBUs) for Site-
impacted sediment to be less than or equal to 10.0. During the RD 
process, and as allowed by the OU3 ROD, the ESTBU sediment cleanup 
values of 10, which are based on direct measurements of PAH 
concentrations in pore water and may overestimate PAH bioavailibity and 
pore water toxicity, were refined to use an Equilibrium Pore Water 
Toxic Unit (EPWTU) of 5 instead.
    Allied Chemical's OU2 RD/RA for the soil and lagoon remediation was 
conducted in accordance with the 1992 CPLA Quality Assurance Project 
Plan (QAPP). The 1992 CPLA QAPP was used as the governing document to 
guide the field sampling, treatability studies, and analytical 
activities performed throughout the CPLA RD/RA, including field and 
laboratory Quality Assurance/Quality Control (QA/QC) procedures and 
data validation protocols. In addition, task-specific work plans were 
prepared and followed for each significant activity, including: Pre-
Design Investigations for Bioremediation, Groundwater, and Waste Fuel 
Recovery; Coal Overburden Characterization and Removal; Site Soils and 
ROD Soils Characterization and Removal; Lagoon Materials Delineation; 
Floodwall Slope Restoration; East Side Batteries Characterization and 
Removal; Ice Creek Monitoring Program; and CPLA Compliance Monitoring 
Program and Stormwater Collection and Monitoring Program.
    QA/QC activities for the OU2 CPLA ROD Soils, including OU2 ROD 
Soils Area 1 (including the Neal Junkyard portion), Area 3 (including 
the Truck Scale portion), and Area 4, included field sampling to 
delineate the areal and vertical extent of the impacted areas, followed 
by excavation to the agreed upon maximum depth of 10 feet. The OU2 Tar 
Plant ROD Soils Areas 5 to 7 were similarly delineated and the impacted 
materials excavated to the agreed upon maximum depth of 5 feet.
    Allied Chemical collected soil samples from 0-1.0 foot, 1.0-2.5 
feet, and 2.5-5.0 feet below ground surface (bgs) in each of the OU2 
ROD Soils Areas to determine the final depth of the excavation. CPLA 
ROD Soils Areas 1, 3 and 4 were additionally sampled from 5.0-7.5 and 
7.5-10.0 feet bgs. The soil samples were analyzed for PAHc and arsenic 
in accordance with the approved USEPA Contract Laboratory Program (CLP) 
Statements of Work for Organics and Inorganics, respectively, which 
were in effect at the time of analysis.
    The most-highly contaminated sample from each of the excavated OU2 
ROD Soils Areas underwent additional testing prior to disposal. The 
additional tests included RCRA toxicity characteristic leaching 
procedure (TCLP) analysis, a paint filter test, and the RCRA hazardous 
characteristic tests for reactivity, corrosivity, and ignitability.
    Allied Chemical conducted an initial characterization of the 
additional CPLA soils identified for remediation in the 1995 ROD 
Amendment #1 in 1994 and 1995. The soil samples were collected in 
incremental one-foot intervals down to a maximum depth of 10 feet. In 
areas with coal and other fuel-grade overburden material, the overlying 
coal or fuel-grade layer was removed down to the ``visually-clean'' 
underlying native materials, and afterwards samples were collected from 
the top foot and then at the 4.0-5.0 feet depth of the native material. 
In 1997, the sampling protocol was revised to be consistent with the 
OU2 ROD Soils Areas sampling, with samples collected from 0.0-1.0 foot, 
1.0-2.5 feet, 2.5-5.0 feet, 5.0-7.5 feet, and 7.5-10.0 feet bgs. The 
samples were analyzed for PAHc and arsenic.
    The additional CPLA soils that required remediation based on the 
predesign investigation were excavated to a maximum depth of 10 feet 
and the materials were stockpiled on-site. Soil containing PAHc 
concentrations greater than 97 mg/kg or arsenic concentrations greater 
than 15 mg/kg were disposed off-site following TCLP and hazardous 
characteristic testing. Before the stockpiled materials were placed in 
the Lagoon 5 excavation, the materials were sampled again for PAHc and 
arsenic at a frequency of 1 sample for every 2,000 cubic yards to 
confirm they were below cleanup standards.
    CPLA soil materials in the area adjacent to the East Tank Farm were 
characterized using samples collected from 0.0-1.0 foot, 1.0-2.5 feet, 
2.5-5.0 feet, 5.0-7.5 feet, and 7.5-10.0 feet

[[Page 37774]]

intervals. Soil in the Truckers' Parking Lot was sampled incrementally 
at 0.5-foot intervals from the ground surface to the underlying native 
material (based on visual observations). Samples of the native material 
were then collected at 0.5-foot intervals until the analytical results 
indicated that the concentrations of PAHc and arsenic were below 0.97 
mg/kg and 15 mg/kg, respectively. The excavated materials from these 
areas were either disposed off-site or backfilled directly into Lagoon 
5 if they were below cleanup levels.
    Characterization of the CPLA East Side Batteries Area focused on 
the materials in the former Coke Plant processing areas and extending 
east to the City of Ironton Floodwall. Near-surface materials were 
removed to expose the underlying ``visually-clean'' native material. 
Samples were collected from the native material in 0.5-foot intervals 
until the concentration of PAHc was less than 0.97 mg/kg and arsenic 
was less than 15 mg/kg. Based on the analytical results, the materials 
were excavated and sent off-site for disposal (after TCLP and hazardous 
characteristic testing) or stockpiled to be placed along the toe of the 
floodwall in the Lagoon Area. The stockpiled materials were subjected 
to another round of sampling for PAHc and arsenic at a frequency of 1 
sample for every 2,000 cubic yards prior to placement along the 
floodwall.
    Allied Chemical discovered soil contamination in the CPLA Ammonia 
Concentration Building Area during other Site work due to the 
discoloration of the soil (a green tint) and a petroleum-like odor. 
This area was not specifically identified in the CPLA ROD or ROD 
Amendments. Allied Chemical sampled the material and detected elevated 
levels of total petroleum hydrocarbons (TPHC).
    Allied Chemical conducted a focused investigation in the Ammonia 
Concentration Building Area and collected soil samples at depth 
intervals corresponding to 0.0-5.0 feet and 5.0-10.0 feet at designated 
locations. The samples were analyzed for TPHC using EPA Method 418.1. 
Based on a review of State of Ohio cleanup standards for hydrocarbon-
contaminated soils that were in effect at the time, a Site-specific 
TPHC cleanup level of 100 mg/kg was adopted for the Ammonia 
Concentration Building Soils. Allied Chemical excavated the sampled 
material having TPHC concentrations greater than 100 mg/kg and disposed 
of it at an off-site landfill following TCLP and hazardous 
characteristic testing.
    The 1990 OU2 ROD and subsequent amendments required the entire 
contents of Lagoon 5 to be removed. Allied Chemical excavated all of 
the materials in Lagoon 5 (about 120,000 tons) down to the visually 
encountered clay layer. Allied Chemical then removed about 2,000 tons 
of the Lagoon 5 clay, sampled the material to confirm that 
concentrations of PAHc and arsenic were below the cleanup criteria of 
97 mg/kg PAHc and 15 mg/kg arsenic, and backfilled the clay into the 
excavated areas of Lagoon 2.
    The materials in Lagoon 2 that required excavation were delineated 
during Allied Chemical's 1997 Lagoon Materials Delineation Program. The 
program involved collecting samples from Lagoons 1 to 4 for PAHc 
analysis. The PAHc sample data was combined with other existing data 
for the lagoons and used in a statistical evaluation to determine which 
materials required removal in order to maintain an overall average 
concentration of PAHc less than 97 mg/kg to meet the 1998 ROD Amendment 
#3 requirement for converting the lagoons into a wetland system. The 
analysis indicated that only certain areas of Lagoon 2 required 
excavation. Additionally, potential ecological risks posed by the 
residual PAHc concentrations in the lagoons were evaluated in the 1999 
Reconnaissance Ecological Risk Assessment and through the performance 
of subsequent annual ecological assessments to confirm that the 
remedial action for the constructed wetlands met objectives.
    Honeywell conducted the OU3 Tar Plant RA in accordance with the 
2013 Construction Quality Assurance Plan, the 2013 Construction Quality 
Assurance Plan--Main Parcel, and the 2014 Construction Quality 
Assurance Plan--River Parcel. The RA for the Main Parcel was a low-
permeability solid waste cap containment remedy over the entire 16-acre 
Main Parcel. The RA for the upland area (riverbank slope) of the River 
Parcel was a geotextile fabric and soil cover over the entire 4-acre 
upland area of the River Parcel. Because these remedial actions were 
containment/cover remedies over the entire property, confirmation 
sampling was not required. Instead, surveys were conducted to confirm 
that the RAOs were attained.
    The areas of Ohio River sediment that exceeded the refined cleanup 
level of the sum of EPWTU of 5 or where tar was observed were 
identified as areas that required remediation during the RD based on 
the predesign investigation studies. Sediment within the design capping 
area had sums of EPWTU values that ranged from 5 to 40, while values 
outside the capped area were less than 5.
    The final capped area and thickness of the OU3 Ohio River sediment 
remedy was confirmed by comparing a baseline multi-beam bathymetric 
survey conducted prior to capping to verification multi-beam 
bathymetric surveys conducted after each layer of the cap was placed to 
check for areal extent and material thicknesses. Honeywell's 
construction managing contractor monitored the surveying results and 
verified that the quality and coverage of the cap met the specified 
design. The construction manager contractor notified the construction 
contractor of any deficiencies to be corrected during construction, and 
approved the final completion of areas post-construction.

Operation and Maintenance

    Operation and maintenance (O&M) activities at the Allied Chemical 
Site are extensive and include activities associated with groundwater/
wastewater operations, monitoring systems, engineered structure 
maintenance, landscaping, and security. Honeywell's O&M costs for the 
period 2014 to 2018 averaged over $1.1 million annually.
    Honeywell conducts the GDA groundwater monitoring in accordance 
with the 1994 GDA Remedial Action Monitoring Plan. The CPLA groundwater 
monitoring and Ice Creek monitoring is performed in accordance with the 
general protocols outlined in the 1995 CPLA Groundwater Compliance 
Sampling and Analysis Plan. Honeywell monitors and conducts O&M for the 
lagoons/wetlands in accordance with the 2000 Lagoon Area Wetlands/
Floodplain Conversion Plan. Honeywell conducts O&M on the Tar Plant 
River Parcel in accordance with the 2015 Operation, Maintenance and 
Monitoring Plan--River Parcel. The Tar Plant Main Parcel O&M is 
conducted in accordance with the 2016 Draft Main Parcel Operation, 
Maintenance, and Monitoring Plan.
    The O&M program includes comprehensive groundwater monitoring, 
potentiometric monitoring, chemical analysis, NPDES discharge 
monitoring, Site inspections, and any necessary repairs. The 
groundwater monitoring program includes monitoring contaminant 
concentrations and groundwater levels to assess the containment of the 
GDA waste, maintenance of Site-wide hydraulic control, and for the 
presence of DNAPL. Honeywell also conducts periodic bathymetric 
surveying in the Ohio River

[[Page 37775]]

to monitor the performance of the underwater sediment cap.
    Honeywell monitors methane gas semiannually at the Main Parcel. In 
2002, the Gas Vent Sampling Program at the GDA was terminated based on 
Honeywell's 2002 Air Emissions Evaluation Report. The 2002 Air 
Emissions Evaluation Report evaluated the analytical data from 14 
consecutive quarterly air monitoring events and determined that the 
emissions of volatile organic compounds from the four GDA vents was 
insignificant. The 2002 report also concluded that the ambient impact 
to the nearest public receptor due to emissions from the vents was 
orders of magnitude lower than the corresponding Maximum Allowable 
Ground Level Concentration. As stipulated by EPA and OEPA, Honeywell 
continues to maintain the gas vents in the event that future sampling 
is required. At this time, however, no further sampling is anticipated.
    Honeywell began annual lagoons/wetland monitoring in 2002. In 2012, 
Honeywell submitted the Lagoon Area Vegetation and Benthic Macro-
invertebrate Monitoring Report, which summarized the activities and 
findings from the annual wetlands/ecological assessments conducted 
within the Lagoon Area (Lagoons 1, 2, 3, 4, and 5). Based on 
consultation with OEPA, EPA informed Honeywell that the final decision 
to determine whether the re-establishment of the wetland/floodplain 
community has been achieved would be made after evaluating the field 
results using OEPA's Vegetation Index of Biotic Integrity (VIBI) 
Assessment Process.
    Honeywell agreed to perform the VIBI assessment on three categories 
of observed wetland vegetation--forested, scrub/shrub, and emergent--in 
order to properly represent and assess each vegetative community. 
Honeywell completed the VIBI Assessment in 2014. Based on this 
assessment, OEPA and EPA approved the discontinuation of monitoring in 
Lagoons 1, 3, 4, and 5. The VIBI assessment, however, identified the 
need to address Lagoon 2 to control the invasive species Purple 
Loosestrife.
    Honeywell completed three herbicide applications in Lagoon 2 in 
July 2015, 2016, and 2017. Honeywell conducted a follow-up VIBI 
Assessment of Lagoon 2 in August 2019. The results of the 2019 VIBI are 
being evaluated. The Lagoon 2 vegetation will continue to be monitored 
and maintained as part of ongoing O&M.
    The 1988, 1990, and 2007 RODs require ICs at the Site. The ICs are 
a protective measure used in conjunction with the containment and 
active treatment methods to restrict property use, maintain the 
integrity of the cleanup remedies, and to assure long-term 
protectiveness for Site areas which do not allow for unrestricted use/
unlimited exposure (UU/UE). The ICs implemented at the Allied Chemical 
Site include Environmental Covenants (ECs), Environmental Restrictions, 
city ordinances, and local zoning requirements. A 1989 Unilateral 
Administrative Order and a 2010 Consent Decree made the ICs a binding 
requirement on Allied Chemical/Honeywell. Copies of the ICs for the 
Allied Chemical Site are available in the February 2020 Updated 
Institutional Control Implementation and Assurance Plan (ICIAP) in the 
Docket.
    The IC for the 8.5-acre portion of the OU1 GDA that includes the 
landfill cap and slurry wall (see ID 18 on Figure 2 in the Docket) is 
an EC that was recorded with the Lawrence County Recorder's office on 
September 14, 2018. The EC requires isolation and containment of the 
waste pit and DNAPL, prohibits the use of groundwater, prohibits 
residential activities and exposure, and prohibits activities that 
would interfere with the slurry wall, cap and, groundwater extraction 
remedies.
    The EC for the remaining 1.5 acres of the GDA that are outside the 
boundaries of the cap and slurry wall, but above areas with groundwater 
contamination (Figure 2, IDs 22 and 23), restricts the land use to 
commercial/industrial activities, prohibits residential use and other 
residential-type activities such as schools, hospitals, assisted living 
and daycare facilities, food stores, restaurants and indoor and outdoor 
entertainment and recreational facilities, prohibits the consumption of 
groundwater, and prohibits food chain products, manufacturing, and 
warehousing. This EC was recorded with the County on September 14, 
2018.
    Land and groundwater use on the OU2 CPLA (Figure 2, IDs 1 to 17) is 
restricted by Environmental Deed Restrictions recorded with the 
Recorder's office on August 22, 2002 in Plat Book 10/Page 181. These 
deed restrictions: Prohibit residential and recreational exposure on 
the properties; prohibit future use that is incompatible with the 
remedial actions; prohibit the consumption of groundwater and 
interference with the remedy; and ensure proper maintenance.
    ECs are implemented on two on-site parcels of the Tar Plant OU3 and 
one off-site parcel (approximately 0.19 acres of the sediment cap on 
off-site property). The EC for the Tar Plant Main Parcel property, 
which consists of the 16-acre landfill cap (Figure 2, ID 19) and the EC 
for the 12-acre River Parcel property, which includes the soil cap on 
the river bank and part of the Ohio River sediment cap, permit the 
properties to be used only for commercial/industrial activities, 
prohibit residential use and other residential-type use, prohibit the 
use of groundwater, and prohibit future use that is incompatible with 
the remedial actions and any interference with the remedy. The EC for 
the River Parcel also prohibits drilling, dredging, and/or vessel 
anchoring on the capped sediment area. These ECs were recorded with the 
Lawrence County Recorder's office on September 14, 2018.
    The EC for the off-site sediment parcel in the Ohio River (Figure 
2, ID 21) was recorded with the Lawrence County Recorder's office on 
September 26, 2018. This EC prohibits any activities which would 
interfere with or adversely affect the integrity or the protectiveness 
of the sediment cap, and does not permit any drilling, dredging, and/or 
vessel anchoring on the property.
    Land and groundwater use on OU1, OU3, and most of OU2 (the portion 
of OU2 located within the City of Ironton) is additionally restricted 
by the City of Ironton Municipal Code Chapter 1272, 1977 and Code 
1046.35, 2013. Chapter 1272 prohibits the installation of groundwater 
wells within the City, with the exception of wells installed on 
commercial property used exclusively and solely for irrigation. Zoning 
ordinance Code 1046.35 restricts OU1, OU3 and the OU2 property located 
in Ironton to General Industrial Use.
    Long-term stewardship (LTS) is addressed at the Allied Chemical 
Site through the implementation of the ICIAP and IC monitoring, the 
ECs, Environmental Deed Restrictions, and local government controls, in 
conjunction with engineering controls, O&M, and routine Site 
inspections, to ensure that the remedy remains protective and continues 
to function as intended. The Allied Chemical Site achieved EPA's Site-
Wide Ready for Anticipated Use designation on October 2, 2018.

Five-Year Reviews

    The Allied Chemical Site requires statutory five-year reviews 
(FYRs) due to the fact that hazardous substances, pollutants, or 
contaminants remain at the Site above levels that allow for 
unrestricted use/unlimited exposure (UU/UE). EPA completed FYRs for the 
Allied Chemical Site in 1999, 2004, 2009, 2014, and 2019.
    EPA completed the most recent FYR for the Site in September 2019. 
EPA's

[[Page 37776]]

2019 FYR found that the Site-wide remedy protects human health and the 
environment. The exposure pathways that could result in unacceptable 
risks are being controlled and the cleanup remedies are operating as 
expected. Site-wide threats have been addressed through: Waste 
containment and isolation (through the slurry wall, low-permeability 
hazardous waste and solid waste-compliant caps, soil, and sediment 
covers, and wetlands conversion); excavation with off-site disposal or 
off-site energy recovery; on-site groundwater containment, extraction 
and treatment; and ICs that restrict land use, prohibit groundwater 
use, and prevent activities that could impair the integrity of the 
engineering controls.
    The 2019 FYR concluded that in order for the remedy to be 
protective in the long-term, an ICIAP needed to be completed and the 
LTS procedures from the ICIAP need to be incorporated into the O&M 
plans for OUs 1, 2, and 3. Honeywell submitted a revised ICIAP to EPA 
on March 11, 2019 and an updated ICIAP to EPA on February 14, 2020. EPA 
approved Honeywell's updated ICIAP on March 5, 2020. EPA and OEPA are 
currently evaluating whether the O&M Plans for the Site need to be 
amended to incorporate the ICIAP, or whether the ICIAP can be 
implemented as a stand-alone document in conjunction with the current 
O&M Plans for OU1, OU2 and OU3.
    Copies of EPA's 1999, 2004, 2009, 2014, and 2019 FYR Reports are 
available in the Docket. EPA expects to complete the next FYR for the 
Allied Chemical Site in 2024.

Community Involvement

    EPA satisfied public participation activities for the Allied 
Chemical Site as required by Sections 113(k)(2)(B)(i-v) and 117 of 
CERCLA, 42 U.S.C. 9613(k)(2)(B)(i-v) and 9617. In 1986, EPA developed a 
Community Relations Plan for the Allied Chemical Site. EPA established 
a local information repository for the Site at the Briggs Lawrence 
County Public Library in Ironton, Ohio. EPA maintains a copy of the 
administrative record documents for the Allied Chemical Site at the 
local information repository, at EPA's Region 5 office in Chicago, 
Illinois, and on EPA's web page for the Allied Chemical Site at https://www.epa.gov/superfund/allied-chemical-ironton.
    EPA distributed fact sheets to the community throughout the Site 
investigations and cleanups to inform the public about Site activities. 
In 1986, EPA held a public meeting to present the findings of the OU1 
and OU2 RI to the community. EPA released the FS Reports and proposed 
cleanup plans for the Site to the public in August 1988, September 
1990, and July 2007 at the start of the OU1, OU2, and OU3 public 
comment periods. EPA published newspaper announcements advertising 
EPA's proposed cleanup plans for the Site, the 30-day public comment 
periods, and the availability of public meetings, in the Ironton 
Tribune. EPA mailed fact sheets summarizing the proposed OU1, OU2 and 
OU3 cleanup plans to individuals on the Site mailing list.
    EPA and OEPA conducted public meetings on August 16, 1988 and 
October 23, 1990. At the meetings, EPA and OEPA explained the details 
of the Allied Chemical OU1 and OU2 FSs, discussed the proposed cleanup 
plans, answered questions from the community, and accepted public 
comments. A court reporter was present to record the meetings. EPA 
distributed copies of the Proposed Plan fact sheets at the meetings. 
EPA offered to hold a public meeting to present and discuss EPA's 
proposed cleanup plan for OU3, but a meeting was not requested.
    EPA received a request to extend the public comment period for the 
OU2 proposed cleanup plan during the October 23, 1990 meeting. As a 
result, EPA extended the comment period for 30 days. EPA published a 
notice of the public comment period extension in the Ironton Tribune. 
On November 7 and 8, 1990, EPA conducted interviews with local 
officials, residents, and a local environmental interest group to 
assess community concerns regarding the Site and to evaluate past 
community relations activities. EPA used the information collected 
during these interviews to update the 1986 Community Relations Plan and 
EPA's mailing list.
    On November 19, 1990, EPA and Ohio EPA appeared before the Ironton 
City Council and members of the public to answer additional questions 
about the Site and the proposed OU2 cleanup plan. EPA distributed a 
``Question & Answer'' fact sheet to provide easy-to-understand answers 
to the questions raised by the community. EPA mailed a copy of the 
``Question & Answer'' fact sheet to all individuals on the updated 
mailing list for the Site.
    EPA received three public comments during the proposed plan public 
comment period for OU1, 25 public comments and one concern during the 
comment period for OU2, and two public comments during the comment 
period for OU3. EPA responded to the comments in Responsiveness 
Summaries attached to the 1988, 1990, and 2007 RODs.
    EPA issued fact sheets summarizing the proposed ROD Amendments #1 
(1995), #2 (1997), and #3 (1998), and held thirty-day public comment 
periods to accept comments on the proposed ROD Amendments. EPA also 
held a public meeting on March 30, 1995 to discuss EPA's proposed ROD 
Amendment #1. EPA did not receive any public comments on proposed ROD 
Amendments #1 or #2, and only positive comments on EPA's proposed ROD 
Amendment #3.
    EPA placed a copy of the 2015 OU3 ESD and the 2020 OU2 ESD in the 
information repositories at the Briggs Lawrence Public Library and at 
EPA's Region 5 office, in the administrative record file, and on EPA's 
web page for the Allied Chemical Site at https://www.epa.gov/superfund/allied-chemical-ironton.
    EPA published advertisements announcing EPA's FYRs for the Allied 
Chemical Site in the local newspaper, the Ironton Tribune, at the start 
of the 1999, 2004, 2009, 2014, and 2019 FYRs. The newspaper 
announcements informed the community about the start and purpose of the 
FYRs and invited the public to submit comments and concerns about the 
Site to EPA. EPA placed copies of the FYR Reports in the local 
information repository at the Briggs Lawrence County Public Library and 
made them available on EPA's website.
    In 2011, EPA and the City hosted a workshop with Site property 
owners and representatives from local businesses, adjacent properties, 
local educational and healthcare institutions, and local and state 
government to plan for Site reuse. In 2018, EPA conducted interviews 
with the City of Ironton mayor, residents, and businesses as part of 
the 2019 FYR process, to document any perceived problems or successes 
with the remedy.
    EPA has satisfied public participation activities for this partial 
deletion of the Allied Chemical Site as required by CERCLA section 
113(k), 42 U.S.C. 9613(k), and CERCLA section 117, 42 U.S.C. 9617. EPA 
arranged to publish an advertisement announcing this proposed direct 
final Partial Deletion and the 30-day public comment period in the 
Ironton Tribune concurrent with publishing this partial deletion in the 
Federal Register. Documents in the deletion docket, which EPA relied on 
for recommending the partial deletion of the Allied Chemical Site from 
the NPL, are available to the public at https://www.regulations.gov and 
at https://www.epa.gov/superfund/allied-

[[Page 37777]]

chemical-ironton. Documents in the Docket include maps which identify 
the Allied Chemical Site; the locations of OU1, OU2 and OU3; areas of 
contamination and remediation; and the ICIAP, FYRs, and other Site 
reports.

Determination That the Criteria for Partial Deletion Have Been Met

    The soil (land) portion of OU1 (GDA); the soil (land) and lagoons 
portion of OU2 (CPLA), except for the OU2 ROD Soils Area 2 located 
within the bermed area of the East Tank Farm (see Figure 3 in the 
Docket); and all of OU3 (which only addressed contaminated soil and 
sediment at the Tar Plant and in the adjacent Ohio River), meet all of 
the site completion requirements specified in Office of Solid Waste and 
Emergency Response (OSWER) Directive 9320.2-22, Close Out Procedures 
for National Priorities List Sites. All cleanup actions and remedial 
action objectives for OU1 soil, OU2 soil and lagoons (except for OU2 
ROD Soils Area 2), and OU3 set forth in the 1988, 1990, and 2007 RODs, 
the 1995 to 1998 ROD Amendments #1 to #3, and the 2015 ESD have been 
implemented for all pathways of exposure. The selected remedial 
actions, RAOs, and associated cleanup levels for OU1 soil, OU2 soil, 
and lagoons (except for OU2 ROD Soils Area 2) and OU3 are consistent 
with EPA policy and guidance. No further Superfund response is 
necessary to protect human health or the environment from the soil 
portion of OU1, the soil and lagoons portion of OU2 (except for OU2 ROD 
Soils Area 2), or from OU3.
    Section 300.425(e) of the NCP states that a Superfund site or a 
portion of a site may be deleted from the NPL when no further response 
is appropriate. EPA, in consultation with the State of Ohio, has 
determined that all required response actions have been implemented for 
the soil portion of OU1, the soil and lagoons portion of OU2 (except 
for the OU2 ROD Soils Area 2), and all of OU3, and that no further 
response action is appropriate for these media/areas.

V. Deletion Action

    EPA, with concurrence of the State of Ohio, through the OEPA, has 
determined that all appropriate response actions under CERCLA, other 
than maintenance, monitoring, and five-year reviews, have been 
completed for the soil (land) portion of OU1 (GDA), the soil (land) and 
lagoons portion of OU2 (CPLA), except for the OU2 ROD Soils Area 2 
located within the bermed area of the East Tank Farm (see Figure 3 in 
the Docket), and all of OU3 (which only addressed contaminated soil and 
sediment at the Tar Plant and in the adjacent Ohio River) of the Allied 
Chemical Site. Therefore, EPA is deleting the soil portion of OU1, the 
soil and lagoons portion of OU2 except for the OU2 ROD Soils Area 2, 
and all OU3, of the Allied Chemical Site from the NPL.
    Because EPA considers this action to be noncontroversial and 
routine, EPA is taking it without prior publication. This action will 
be effective August 24, 2020 unless EPA receives adverse comments by 
July 24, 2020. If adverse comments are received within the 30-day 
public comment period, EPA will publish a timely notice of withdrawal 
of this direct final Notice of Partial Deletion before its effective 
date and the partial deletion will not take effect. EPA will prepare a 
response to comments and continue with the deletion process on the 
basis of the notice of intent to partially delete and the comments 
already received. There will be no additional opportunity to comment.

List of Subjects in 40 CFR Part 300

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

    Dated: June 11, 2020.
Kurt Thiede,
Regional Administrator, Region 5.

    For the reasons set out in this document, 40 CFR part 300 is 
amended as follows:

PART 300--NATIONAL OIL AND HAZARDOUS SUBSTANCES POLLUTION 
CONTINGENCY PLAN

0
1. The authority citation for part 300 continues to read as follows:

    Authority:  33 U.S.C. 1251 et seq.; 42 U.S.C. 9601-9675; 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.


0
2. Table 1 of appendix B to part 300 is amended by revising the entry 
under ``Allied Chemical & Ironton Coke'', ``OH'' to read as follows:

Appendix B to Part 300--[Amended]

                                       Table 1--General Superfund Section
----------------------------------------------------------------------------------------------------------------
                 State                             Site name                   City/county           Notes (a)
----------------------------------------------------------------------------------------------------------------
 
                                                  * * * * * * *
OH....................................  Allied Chemical & Ironton Coke  Ironton.................               P
 
                                                  * * * * * * *
----------------------------------------------------------------------------------------------------------------
(a) * * *
P = Sites with partial deletion(s).

* * * * *
[FR Doc. 2020-13302 Filed 6-23-20; 8:45 am]
BILLING CODE 6560-50-P