FIFTH FIVE-YEAR REVIEW REPORT FOR
LINEMASTER SWITCH CORPORATION SUPERFUND SITE
WINDHAM COUNTY, CONNECTICUT
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Prepared by
U.S. Environmental Protection Agency
Region 1
BOSTON, MASSACHUSETTS
Digitally signed by BRYAN
BRYAN OLSON ^2024.09.23 18:27:13
-04W
Bryan Olson, Division Director Date
Supcrfund and Emergency Management Division
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Table of Contents
LIST OF ABBREVIATIONS & ACRONYMS 3
I. INTRODUCTION 5
Site Background 5
II. RESPONSE ACTION SUMMARY 6
Basis for Taking Action 6
Response Actions 7
1993 Record of Decision Remedy Components 7
2004 Explanation of Significant Differences (ESD) 7
Status of Implementation 8
Systems Operations/Operation & Maintenance 11
III. PROGRESS SINCE THE LAST REVIEW 11
IV. FIVE-YEAR REVIEW PROCESS 13
Community Notification, Involvement & Site Interviews 13
Data Review 14
Soil Monitoring 14
Air Monitoring 14
Hydraulic Containment 14
Groundwater Monitoring 15
VOCs 15
PFAS 18
Arsenic 19
VOCs Mass Recovery and Groundwater Extraction Rates 20
Site Inspection 20
V. TECHNICAL ASSESSMENT 21
QUESTION A: Is the remedy functioning as intended by the decision documents? 21
Question A Summary: 21
QUESTION B: Are the exposure assumptions, toxicity data, cleanup levels, and remedial action
objectives (RAOs) used at the time of the remedy selection still valid? 22
Question B Summary: 22
Changes in Standards and TBCs 22
Safe Drinking Water Act (SDWA) 23
Connecticut Remediation Standard Regulations (Section 22a-13 3k-1 through 22a-133k-3 of
the Regulations of Connecticut State Agencies) 23
PFAS Activities at Linemaster Switch Corporation Superfund Site 23
PFAS Toxicity Values 24
2024 Cancer and Non-cancer Toxicity Values for PFOA and PFOS 24
2023 Non-cancer Toxicity Values for PFODA, PfTetA, PFDoDA, PFUDA, PFHxA, PFPrA,
HQ-115 24
2022 Non-cancer Toxicity Values for PFBA 24
PFAS State Standards 24
Summary of Site PFAS Activities 25
1,4-Dioxane at Linemaster Switch Corporation Superfund Site 25
Floodplain 26
Changes in Toxicity and Other Contaminant Characteristics 26
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2022 cis-l,2-Dichloroethene Non-Cancer Toxicity Value 26
2020 Trans- 1,2-dichloroethene non-cancer toxicity value 27
Changes in Risk Assessment Methods 27
Changes in Exposure Pathways 27
EPA Regional Screening Levels 27
Methods for Evaluating Vapor Intrusion 28
EPA Guidance on Vapor Intrusion 28
EPA VISL Calculator 28
Vapor Intrusion Investigations for the Linemaster Switch Corporation Superfund Site 28
QUESTION C: Has any other information come to light that could call into question the
protectiveness of the remedy? 28
Question C Summary: 28
VI. ISSUES/RECOMMENDATIONS 29
OTHER FINDINGS 30
VII. PROTECTIVENESS STATEMENT 31
VIII. NEXT REVIEW 31
APPENDIX A - Reference List
APPENDIX B - Historical Figures, Tables and Charts
APPENDIX C - Interviews
APPENDIX D - Five-Year Review Site Inspection Checklist and Photograph Log
APPENDIX E - Five-Year Review Press Release
APPENDIX F - Site Chronology
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LIST OF ABBREVIATIONS & ACRONYMS
1,2-DCA 1,2-Dichloroethane
1,2-DCE 1,2-Dichloroethene
cis-1,2-DCE cis-1,2-Dichloroethene
trans-1,2-DCE trans-1,2-Dichloroethene
1.1.1-TCA 1,1,1-Trichloroethane
1.1.2-TCA 1,1,2-Trichloroethane
ARAR Applicable or Relevant and Appropriate Requirement
AWQC Ambient Water Quality Criteria
CASRN Chemical Abstracts Service Registry Number
CERCLA Comprehensive Environmental Response, Compensation, and Liability Act
CFR Code of Federal Regulations
COC Contaminants of Concern
CSF Cancer Slope Factor
CSM Conceptual Site Model
CT Connecticut
CT DEEP Connecticut Department of Energy and Environmental Protection
CT DPH Connecticut Department of Public Health
CVOC Chlorinated VOC
DVE Dual Vapor Extraction
EPA United States Environmental Protection Agency
ESD Explanation of Significant Differences
FFS Focused Feasibility Study
FS Feasibility Study
ft bgs Feet Below Ground Surface
FYR Five-Year Review
GAC Granular Activated Carbon
gpm Gallons per Minute
GWPC Groundwater Protection Criteria
GWVC Groundwater Volatilization Criteria
HFPO-DA Hexafluoropropylene Oxide Dimer Acid
HHRA Human Health Risk Assessment
HI Hazard Index
HQ Hazard Quotient
HQ-115 Lithium bis[(trifluoromethyl)sulfonyl]azanide
HBWC Health-Based Water Concentrations
lb Pound
ICs Institutional Controls
IRA Interim Removal Action
IRIS Integrated Risk Information System
IRTS Interim Removal Treatment System
IRTSINF IRTS Air Stripper Influent
IRTSEFF IRTS Air Stripper Effluent
IUR Inhalation Unit Risk Factors
LSC Linemaster Switch Corporation
LTMP Long-Term Monitoring Program
MCL Maximum Contaminant Levels
mg/kg Milligrams per kilogram (equals ppm)
mg/m3 Milligrams per cubic meter (equals ppb)
jxg/L Micrograms per liter (equals ppb)
ng/L Nanograms per liter (equals ppt)
MOM Management of Migration
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ND
Non-Detect
NCP
National Oil and Hazardous Substances Pollution Contingency Plan
NRWQC
National Recommended Water Quality Criteria
NPL
National Priorities List
O&M
Operation and Maintenance
OHHRRAF
OLEM's Human Health Regional Risk Assessment Forum
OLEM
Office of Land and Emergency Management
ORD
Office of Research and Development
PCE
T etrachloroethene
PFAS
Per- and Polyfluoroalkyl Substances
PFBA
Perfluorobutanoic Acid
PFBS
Perfluorobutanesulfonic Acid
PFOA
Perfluorooctanoic Acid
PFODA
Perfluorooctadecanoic Acid
PFDoDA
Perfluorododecanoic Acid
PFOS
Perfluorooctane Sulfonic Acid
PFHxA
Perfluorohexanoic Acid
PFHpA
Perfluoroheptanoic Acid
PFHxS
Perfluorohexane Sulfonic Acid
PFNA
Perfluorononanoic Acid
PFPrA
Perfluoropropanoic Acid
PFTetA
Perfluorotetradecanoic Acid
PFUDA
Perfluoroundecanoic Acid
PPRTV
Provisional Peer Reviewed Toxicity Value
ppm
parts per million
ppb
parts per billion
ppt
parts per trillion
PRP
Potentially Responsible Party
RAO
Remedial Action Objectives
RfC
Reference Concentrations
RfD
Reference Doses
RI
Remedial Investigation
ROD
Record of Decision
RPM
Remedial Project Manager
RSL
Regional Screening Levels
RSR
Remediation Standard Regulation
sc
Source Control
SDWA
Safe Drinking Water Act
SFO
Oral Cancer Slope Factors
SL
Screening Levels
SWC
Soil Vapor Volatilization Criteria
SWPC
Surface Water Protection Criteria
TBC
To be Considered
TCE
Trichloroethene
TFSI
1,1,1 -Trifluoro-N-(trifluoromethanesulfonyl)methanesulfonamide
TOP
Total Oxidizable Precursor
USGS
United States Geological Survey
UU/UE
Unlimited Use and Unrestricted Exposure
VISL
Vapor Intrusion Screening Level
voc
Volatile Organic Compound
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I. INTRODUCTION
The purpose of a Five-Year Review (FYR) is to evaluate the implementation and performance of a remedy in
order to determine if the remedy is and will continue to be protective of human health and the environment. The
methods, findings, and conclusions of reviews are documented in five-year review reports such as this one. In
addition, FYR reports identify issues found during the review, if any, and document recommendations to address
them.
The U.S. Environmental Protection Agency (EPA) is preparing this five-year review pursuant to the
Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) Section 121, consistent
with the National Oil and Hazardous Substances Pollution Contingency Plan (NCP) (40 CFR Section
300.430(f)(4)(ii)) and considering EPA policy.
This is the fifth FYR for the Linemaster Switch Corporation (LSC) Superfund Site. The triggering action for this
statutory review is the fourth FYR completed on September 24,2019. The FYR has been prepared due to the fact
that hazardous substances, pollutants, or contaminants remain at the Site above levels that allow for unlimited use
and unrestricted exposure (UU/UE).
The LSC Superfund Site Five-Year Review was led by John Bryant, Remedial Project Manager (RPM).
Participants included Courtney Carroll, EPA Human Health Risk Assessor; Charlotte Gray, EPA Community
Involvement Coordinator; Eve Vaudo, EPA Enforcement Counsel; Micheal Senyk, Connecticut Department of
Energy & Environmental Protection (CT DEEP); and EPA contractor representatives (EA Engineering and
Sanborn, Head & Associates). The LSC and the CT DEEP were notified of the initiation of the five-year review.
The review began on 2/1/2024. Documents reviewed in support of this FYR are listed in Appendix A. Appendix
B provides select figures, tables, and charts.
Site Background
The Site consists of a 92-acre parcel that is bordered by Connecticut State Route 171 to the south, Plaine Hill
Road to the west, and a mix of residential and undeveloped properties to the north and east. The LSC
manufacturing facility is located near the center of the parcel on a topographic high with approximately 160 feet
(ft) of vertical relief between high and low points (See Appendix B.l).
Prior to 1952, the Site was used for residential purposes and small-scale farming. Beginning in 1952, LSC began
manufacturing foot-operated switches. Currently, LSC occupies a 45,525-square-foot facility where electrical
power switches, air valves, electrical cord sets, and metal nameplates are manufactured. In addition to the
manufacturing facility, there is also an active bed and breakfast (B&B), a banquet hall, and four residential
dwellings located on the property.
The aquifer underlying the Site has a CT DEEP Class GA groundwater classification; a GA classification
indicates that water is considered suitable for drinking water without treatment. Groundwater is used for potable
water at the LSC Site and by all surrounding residences and facilities. There is no municipal supply or public
water system servicing this area. Domestic drinking water wells are located within close proximity to the LSC
Site. A Site chronology through mid-2024 and additional background information can be viewed in Appendix F.
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FIVE-YEAR REVIEW SUMMARY FORM
SITE IDENTIFICATION
Site Name: Linemaster Switch Corporation (LSC) Superfund Site
EPA ID: CTDOO1153923
Region: 1
State: CT
City/County: Woodstock/Windham
NPL Status: Final
Multiple OUs?
No
Has the site achieved construction completion?
Yes
Lead agency: EPA
[If "Other Federal Agency", enter Agency name]'.
Author name (Federal or State Project Manager): John Bryant
Author affiliation: U.S. Environmental Protection Agency
Review period: 9/12/2019 - 9/12/2024
Date of site inspection: 4/24/2024
Type of review: Statutory
Review number: 5
Triggering action date: 9/25/2019
Due date (fiveyears after triggering action date)'. 9/25/2024
II. RESPONSE ACTION SUMMARY
Basis for Taking Action
LSC began manufacturing foot-operated switches at the Site in May 1952. As part of the manufacturing
operations, trichloroethene (TCE) was used between 1969 and 1979 as a parts degreaser. Other chemicals used
included 1,1,1-trichloroethane (1,1,1-TCA); acetone; toluene; xylene; and various alcohols (Fuss & O'Neill,
1992). Some of these chemicals, including TCE, were reportedly released to a dry well located directly east of the
LSC production facility. The dry well was removed in June 1989 (TRC, 2018b).
The remedial investigation/feasibility study (RI/FS) for the Site was completed in 1992. The RI/FS concluded that
the disposal of TCE and other hazardous substances into the dry well had contaminated soil and groundwater at
concentrations above state and federal standards. Soil in the source area is a continuing source of contamination to
groundwater. The human health risk assessment (HHRA), performed during the Remedial Investigation (RI),
identified the following potential exposure pathways: (1) ingestion of groundwater; (2) ingestion of soil; and (3)
inhalation of vapors during excavation of soil within the Site. In addition, the HHRA concluded that groundwater
volatile organic compound (VOC) concentrations posed an unacceptable risk to human health and the
environment given the present and potential future use of Site groundwater as a source of drinking water. The
LSC Site was listed on the National Priorities List (NPL) on February 21, 1990.
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Response Actions
Following the RI completion, LSC installed an Interim Removal Action (IRA) groundwater extraction and
treatment system in June 1992 to contain VOC-impacted groundwater and to prevent its migration off site. The
IRA system consists of six deep bedrock extraction wells and the Interim Removal Treatment System (IRTS),
which uses a packed-tower air stripper and granular activated carbon (GAC) filtration. Although not considered
part of the IRA system, the LSC water supply well (GW08DB), located in the southern portion of the Site, also
extracts groundwater from the deep bedrock portion of the aquifer and is treated for on-Site potable use. LSC tests
the wells as part of the Long-Term Monitoring Program (LTMP) and maintains the treatment systems.
The Remedial Action Objectives (RAOs) identified in the 1993 Record of Decision (ROD) are:
Source Control Response Objectives:
• Prevent or mitigate the continued release of hazardous substances to the groundwater and surface water by
removing the opportunity for contact between precipitation and groundwater and the contaminated soils; and
• Reduce the concentrations of VOCs in the soil within the Zone 1 area so that concentrations of VOCs in the
groundwater will not exceed drinking water standards and will not pose a risk to human health and the
environment.
Management of Migration Response Objectives:
• Eliminate or minimize the threat posed to human health and the environment by preventing exposure to
groundwater contaminants;
• Prevent further migration of groundwater contamination beyond its current extent; and
• Restore contaminated groundwater to drinking water standards, and to a level that is protective of human
health and the environment, as soon as practicable.
1993 Record of Decision Remedy Components
The 1993 ROD selected a remedy that included these source control and management of migration (MOM)
components:
• In-situ vacuum extraction of contaminated soil to remove VOCs.
• Removal of contaminated groundwater from the overburden and bedrock using extraction wells.
• Treatment of contaminated groundwater using air stripping with activated carbon for emissions control.
• Environmental monitoring of soil, groundwater, surface water, and private residential wells.
• Institutional controls (ICs) in the form of deed restrictions to prohibit the use of the groundwater until the
cleanup levels are met.
• Five-Year Reviews.
Following several pilot tests, a Dual Vapor Extraction (DVE) system was designed and installed to extract soil
vapors while simultaneously dewatering groundwater. Dewatering of the Phase 1A area commenced in April
1998 and the DVE system was constructed and became operational in December 1998.
2004 Explanation of Significant Differences (ESD)
In 2003, EPA concluded that low-permeability soil was preventing further dewatering and, as a result,
contributing to low rates of removal for VOC within the Phase 1A Area. EPA subsequently determined that the
vapor extraction component of the DVE system was no longer significantly contributing to the remediation of the
Site and should be discontinued. In December 2004, EPA signed an Explanation of Significant Differences (ESD)
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(USEPA, 2004). The remedy was modified to only continue groundwater extraction and treatment. However, the
cleanup objectives of the 1993 ROD remained unchanged. The vapor extraction component of the DVE system
was permanently decommissioned in 2004 and 2005.
Status of Implementation
All components of the source control and management of migration response actions specified in the 1993
ROD, as modified by the 2004 ESD, have been constructed and are operational. ICs were placed on the Site
in 2005 and then updated in 2008 (see Table 1 below).
Tabic 1: Summary of Implemented ICs
Media, engineered
controls, and areas that do
not support UU/UE based
on current conditions
ICs
Needed
ICs Called
for in the
Decision
Documents
Impacted
Parccl(s)
IC
Objective
Title of IC
Instrument
Implemented and
Date (or planned)
Groundwater
Yes
Yes
Map 5781,
Block 51,
Lots 2,2-1
Restrict groundwater
withdrawal or
consumption unless the
groundwater attains
drinking water standards
or is used for treatment
or monitoring of
groundwater for the
performance of the
Remedial Action.
Declaration of
Restriction and
Grant Easement,
between Monaco
and USA, August
17,2004
Groundwater
Yes
Yes
Map 5781,
Block 51,
Lots 2,2-1
Groundwater supply well
GW-9 shall not be used
to extract more than
60,000 gallons per
month; no additional
water supply wells
should be installed, and
GW-36 should be and
remain locked.
Declaration of
Restriction and
Grant Easement,
between Monaco
and USA, Aug. 17,
2004
Soil/Bedrock
Yes
Yes
Map 5781,
Block 51,
Lots 2,2-1
No excavation or
construction activities
shall be undertaken
within the bedrock under
the Property.
Declaration of
Restriction and
Grant Easement,
between Monaco
and USA, Aug. 17,
2004
Groundwater
Yes
Yes
Map 5781,
Block 51,
Lot 1
Restrict groundwater
withdrawal or
consumption unless
groundwater is being
used for treatment or
monitoring of
groundwater for the
performance of the
Remedial Action.
Declaration of
Restriction and
Grant Easement,
between Blakely
and USA, Aug. 17,
2004
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Media, engineered
controls, and areas that do
not support UU/UK based
on current conditions
ICs
Needed
ICs Called
for in the
Decision
Documents
Impacted
Parccl(s)
IC
Objective
Title of IC
Instrument
Implemented and
Date (or planned)
Groundwater
Yes
Yes
Map 578 1,
Block 51,
Lot 1
Water supply well GW-
30 shall only be used
from April 1st - Sept.
30th of each year and
may only be used for
non-potable uses. No
additional water supply
wells shall be installed.
GW-12 should be
locked.
Declaration of
Restriction and
Grant Easement,
between Blakely
and USA, Aug. 17,
2004
Soil/Bedrock
Yes
Yes
Map 5781,
Block 51,
Lot 1
No excavation or
construction activities
shall be undertaken
within the bedrock under
the Property.
Declaration of
Restriction and
Grant Easement,
between Blakely
and USA, Aug. 17,
2004
Vegetation/Wetland
No
No
Map 5781,
Block 51,
Lot 1
Alteration of vegetation
or hydrology of the
Northwest Wetland Area
is prohibited.
Declaration of
Restriction and
Grant Easement,
between Blakely
and USA, Aug. 17,
2004
Groundwater
Yes
Yes
Map 5781,
Block 51,
Lot 1A
Restrict groundwater
withdrawal or
consumption unless the
groundwater attains
drinking water standards
or is used for treatment
or monitoring of
groundwater for the
performance of the
Remedial Action.
Declaration of
Restriction and
Grant Easement,
between LSC and
USA, Aug. 17,
2004
Groundwater
Yes
Yes
Map 5781,
Block 51,
Lot 1A
Water supply well
GW08DB shall not be
used to extract more than
160,000 gallons per
month. LSC is
responsible for
monitoring and reporting
the volume of water
extracted from GW-9.
No additional water
supply wells shall be
installed.
Declaration of
Restriction and
Grant Easement,
between LSC and
USA, Aug. 17,
2004; and
Approval Under
Para. 2(b)(i) of
Declaration of
Restriction and
Grant of Easement,
Sep. 16,2008.
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Media, engineered
controls, and areas that do
not support UU/UK based
on current conditions
ICs
Needed
ICs Called
for in the
Decision
Documents
Impacted
Parccl(s)
IC
Objective
Title of IC
Instrument
Implemented and
Date (or planned)
Land Use
Yes
Yes
Map 5781,
Block 51,
Lot 1A
The Soil Restriction
Area shall be used solely
for commercial and
industrial activity. Iron
monument markers shall
be maintained to mark
the boundaries of the
Soil Restriction Area.
Declaration of
Restriction and
Grant Easement,
between LSC and
USA, Aug. 17
2004
Soil/Bedrock
Yes
Yes
Map 5781,
Block 51,
Lot 1A
No excavation or
construction activities
shall be undertaken
within the Property.
Declaration of
Restriction and
Grant Easement,
between LSC and
USA, Aug. 17,
2004
Vegetation/Wetland
Yes
No
Map 5781,
Block 51,
Lot 1A
Alteration of vegetation
or hydrology of the
Northwest Wetland Area
is prohibited.
Declaration of
Restriction and
Grant Easement,
between LSC and
USA, Aug. 17,
2004
A vapor intrusion investigation was completed on March 30, 2011, for two residential dwellings located at the
LSC facility. A site plan of the two dwellings, referred to as buildings #105 and #111 is included in Appendix
B.l.
An initial evaluation of the potential for vapor intrusion at the Site was conducted by the PRPs in 2004. This
investigation not only included the two dwellings noted above but included the LSC facility as well. The results of
this sampling event indicated that only one VOC had been detected (trichloroethylene) underneath the facility
building at a concentration well below the applicable EPA screening level. There were no detections under the
two residential dwellings. Although sub-slab soil vapor samples were collected during this investigation, indoor
air samples were not concurrently collected and analyzed to determine the existence of a completed soil vapor
pathway.
The overall objectives of the 2011 vapor intrusion investigation were to (1) determine if there is a complete
migration pathway present between Site-related VOCs in groundwater, subsurface soil vapor, and indoor air in
overlying structures, (2) to quantify the specific VOCs and their concentrations in indoor air, and (3) to evaluate
whether the concentrations are elevated above background concentrations and/or may pose a health risk to
building occupants.
Vapor sampling activities were conducted between March 29 and 30,2011. A total of six sub-slab vapor samples,
three indoor air samples, and one outdoor (ambient) air sample were collected during the sampling activities. The
sampling activities are summarized and are provided in more detail in the Vapor Intrusion Report by Woodard &
Curran, dated July 11,2012.
All six sub-slab vapor samples collected at the two residences were collected concurrently with the three indoor
air samples and one outdoor air sample. Only one target VOC (TCE) was detected in the sub-slab vapor samples
analyzed. Detections of TCE were reported in four of the six sub-slab soil vapor samples collected at
concentrations ranging from 0.537 to 10.6 1 p,g/m3. All reported detections of TCE were below the estimated soil
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vapor screening value of 4.3 1 p,g/m3, except for one sample in Residence #105 (based on 10 times the 2012
USEPA Region 9 Screening Level for Residential (indoor) Air for TCE of 0.43 p,g/m3 and the Target Shallow Soil
Gas Concentration from the Vapor Intrusion Screening Level (VISL) calculator). This one detection does not,
however, exceed EPA's acceptable risk range of 10"4 to 10"6 for Superfund sites, at a risk calculation of 2.7 X 10"6.
Target VOCs were detected in only one indoor air sample at residence #105, which included 1,2-dichloroethane
(1 ,2-DCA) at 0.210 p,g/m3 and TCE at 1.16 p,g/m3. Both of these detected concentrations exceeded their
respective 2012 USEPA Region 9 and VISL Target Indoor Air Concentrations of 0.094 p,g/m3 (1 ,2-DCA) and
0.43 ng/m3 (TCE). While 1 ,2-DCA was not detected in the sub-slab soil vapor samples, it is a groundwater COC
detected in the underlying contaminated plume on-site.
The outdoor air sample collected indicated that no target VOCs were detected above lab reporting limits.
Because maximum site groundwater TCE and vinyl chloride concentrations continue to exceed residential
groundwater VISLs, a vapor mitigation system and vapor barrier have been put in place at buildings #105 and
#111 to prevent any possible exposure pathway.
A review of current Site information does not identify any current vapor intrusion concerns; however, if there is a
change in site conditions or land use that suggest a VI pathway could develop, a re-evaluation may be needed.
Systems Operations/Operation & Maintenance
Currently the treatment system is maintained and is operating as designed. There were no major operational
difficulties encountered during the review period (2019-2024) with the exception of the failure to reinstall a pump
at extraction well MW17DB (lowest yielding well in the extraction network) between June and October 2021 due
to it becoming stuck within the well itself during reinstallation. The Potentially Responsible Party (PRP)
discussed potential options with the EPA following this event and it was concluded that further actions should
wait until EPA selected an amended remedy for the Site (TRC, 2022).
LSC personnel inspect and record measurements for both IRA and reconfigured Phase 1A remedial systems on a
regular basis. Inspection reports for the IRA system are completed weekly. Routine maintenance procedures are
performed by LSC to limit system problems and corresponding system down time. As of2020, the PRP initiates
inspection requests of off-Site domestic wells.
The treatment systems for the potable supplies are being maintained by the PRPs for the current on-Site
production well (GW08DB) and off-Site private wells. GAC is replaced when analytical data indicate
breakthrough of chlorinated VOCs (CVOCs) has occurred. The IRTS GAC filters were replaced by LSC staff on
November 7,2019 due to low concentrations of CVOCs being detected in the final treatment samples.
Additionally, the Woodstock Townhall replaced the GAC filters of the treatment system associated with their
potable well, GW40DB, on December 5,2020 independent of input from LSC (TRC, 2021b). Lastly, the facility
is currently prepping the conversion of extraction well MW14DB to be the on-Site production well instead of
GW08DB due to not having high enough yields for the facility during the summer months (TRC, 2024a).
III. PROGRESS SINCE THE LAST REVIEW
This section includes the protectiveness determinations and statements from the last five-year review as well as
the recommendations from the last five-year review and the current status of those recommendations.
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Table 2: Protectiveness Determinations/Statements from the 2019 FYR
ou#
Protectiveness
Determination
Protectiveness Statement
1
Short-term Protective
The remedy is protective of human health and the environment
in the short term. There are no current unacceptable exposure
risks to Site contaminants. Additionally, ICs to restrict
groundwater use and prohibit excavation at the facility have
been established. Contaminated groundwater used for potable
supply are treated as necessary. For the remedy to be
protective in the long-term the following actions need to be
taken to ensure protectiveness; 1) evaluate additional source
control and groundwater response actions to identify
alternative measures to ensure the RAOs established in the
ROD will be attained, 2) identify potential PFAS use at the
Site to determine whether sampling and analysis for these
contaminants should be added to the long term monitoring
program, and 3) evaluate and verify the RI determination of
elevated background arsenic levels in groundwater exceeding
MCLs at the Site to clarify whether arsenic should be a COC
and whether an arsenic cleanup value is appropriate for the
Site.
Table 3: Status of Recommendations from the 2019 FYR
OU#
Issue
Recommendations
Current
Status
Current Implementation Status
Description
Completion
Date (if
applicable)
1
Remedy
Performance
Evaluate additional
source control and
MOM options in the
FFS.
Completed
The final FFS report was submitted by
TRC in October 2023 (with the initial
FFS report submitted in January 2020)
and evaluates a multitude of source
control and management of migration
options. EPA issued a "Proposed Plan"
in December 2023 that presented its
preferred Remedial Alternatives for the
modified remedy and sought public
comment. EPA is preparing an
amended ROD.
10/20/2023
1
Monitoring -
PFAS
Perform a review of
current and past
industrial practices and
chemical use at the
facility to assess whether
PFAS may have been
manufactured or used. If
the review indicates
possible sources, then
PFAS sampling and
analysis should be added
to a future monitoring
event.
Ongoing
TRC collected PFAS samples from
select wells on-Site and off-Site in
January 2021 and November 2021
(TRC, 2021a). Total oxidizable
precursor (TOP) analyses were
performed as part of the November
2021 Annual Progress Report.
Additional PFAS sampling occurred at
the Site at source area wells MW10SB,
FW-E, FW-I, and MW26T and
extraction well MW14DB in May
2023. PFAS sampling continues to
occur at the Site during normal
sampling events.
N/A
1
Remedy
Performance
Evaluate and verify the
RI determination of
elevated background
arsenic levels in
groundwater exceeding
MCLs at the Site to
Ongoing
TRC conducted an evaluation of the
arsenic background concentration
established in the RI compared to
arsenic data collected in 2021 and 2022
at the Site, which also included
locations previously used in the arsenic
N/A
12
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ou#
Issue
Recommendations
Current
Status
Current Implementation Status
Description
Completion
Date (if
applicable)
clarify whether arsenic
should be a Site COC
and whether an arsenic
cleanup value is
appropriate for the Site.
background concentration in the RI,
and concluded that the previously
established arsenic background
concentration of 188 |xg/L was still
valid (TRC, 2022a); however, EPA
subsequently determined that not
enough data has been collected to
support the calculation of an updated
background arsenic concentration for
the Site and requested additional
arsenic sampling. TRC collected
additional arsenic data at the Site
throughout 2022 and 2023. Arsenic
sampling will continue until enough
information has been collected to
support an updated background arsenic
concentration for the Site.
IV. FIVE-YEAR REVIEW PROCESS
Community Notification, Involvement & Site Interviews
EPA published a press release (see Appendix E) on February 1st, 2024, to announce the start of the Five Year
review "EPA to Review Cleanup at Woodstock, Connecticut Superfund Site this Year" (USEPA, 2024) The
results of the review and the report will be made available at the Site information repository located on the site
profile page: www.epa.gov/superfund/linemaster
The public can access the information repository from any device that has internet or go to the Woodstock Town
Hall for internet access.
During the FYR process, interviews were conducted to document any perceived problems or successes with the
remedy that has been implemented to date. Formal interviews were conducted with Diane Stallings (TRC, LSC's
consultant), Michael Senyk (CT DEEP), and Chandler Paquette (Woodstock First Selectman). No operational
issues were identified during the interviews. The results of these interviews are summarized below, and records
found in Appendix C.
• Diane Stallings, TRC, was interviewed via email on May 22,2024. She stated that her overall impression
of the Site was good, but it would be difficult to achieve current soil and groundwater remedial goals
without addressing remaining source area impacts. The current performance of the Focused Feasibility
Study for source control and management of migration to determine the most cost-effective means of
resolving remaining contaminant issues while protecting the public and environment should be a top
focus. Diane believes the remedy is functioning as expected apart from the detection and migration of
contaminants to two off-site domestic water supply wells to the south of the Site. She states that the site's
remedial systems are well operated and discharges from the system meet applicable discharge criteria.
She is not aware of any community concerns and feels very well informed of the site's activity and
progress.
• Chandler Paquette, First Selectman Town of Woodstock, was interviewed via email on April 29,2024.
He stated that the Town's overall impression of the Site is that it's always maintained, neat and clean. He
is in a new role as the First Selectman of the Town of Woodstock and isn't aware of any issues the review
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should focus on. He is not aware of any issues at the site and believes he feels well informed about the
Site's activities and progress. There have been no complaints or incidents that required a response from
the Town of Woodstock.
• Michael Senyk, CTDEEP, was interviewed via email on June 5,2024. Mike's overall impression of the
project is that the Site remedial activities are improving conditions at the Site and that continued
cooperation with the PRP, and surrounding community, are encouraging. He believes the FYR should
focus on preventing further off-site migration of groundwater contamination to protect those currently
using the groundwater for drinking purposes and to protect the drinking water resource for future
development potential. Mike believes that the current remedy has been acceptable. He is not aware of any
community concerns but land surrounding the site could be developed for residential use in the future. He
is not aware of any complaints of incidents related to the Site that required a response from the State in
the last 5 years. Mike believes that groundwater used by the surrounding community for drinking water
has been impacted by historic site operations. He feels CTDEEP has been well informed about Site
activities.
Data Review
Data from the previous 5 years were reviewed. Select analytical data, figures, and tables presented in the PRPs
October 2023 finalized FFS report and 2019,2020,2021,2022, and 2023 annual reports, are included in
Appendix B. Key observations regarding analytical data collected since 2019 are summarized in the following
sections.
Soil Monitoring: Soil VOC concentrations have not been monitored in the source area since the 2017 Site
Investigation (TRC, 2018a); however, there still appears to be an untreated source of contamination in soil near
the plume that has not been remedied, per fluctuations in VOC concentrations in the overburden and shallow
weathered bedrock on Site. Further discussion of contaminant migration in groundwater is provided in the
following sections.
Air Monitoring: Although air monitoring is not performed at the Site currently, shallow groundwater
concentrations in the vicinity of the buildings were compared to applicable vapor criteria. VOCs in shallow
groundwater beneath the manufacturing facility exceed applicable vapor criteria; however, vapor intrusion
studies, including sub-slab soil gas and indoor air sampling at the two residential buildings located to the north of
the LSC facility, and an associated risk assessment, were completed in 2011 and concluded there were no
unacceptable human health risks (Woodard & Curran, 2011).
Hydraulic Containment: Hydraulic containment of site-related contaminated groundwater in deep bedrock is
provided by the IRA system, which consists of six deep bedrock extraction wells (MW01DB, MW06DB,
MW14DB, MW15DB, MW17DB, and GW10DB), with extraction well MW17DB having been inactive (with
EPA's concurrence) as of 2021 (TRC, 2022). The facility's current water supply well GW08DB is included in the
evaluation of hydraulic containment since it is a deep bedrock supply well used to service the facility; however,
MW14DB is currently being converted to replace GW08DB as the facility's water supply well in the near future
as previously noted in Section II. Additionally, the reconfigured Phase 1A Area remedial system was installed in
1998 and removes VOC impacted groundwater from 5 overburden wells FW-E, FW-H, FW-1, FW-J, and FW-35,
and 1 shallow bedrock well MW10SB within the source area (see Appendix B.l).
Groundwater in deep bedrock at the Site appears to generally flow to the south and southeast on different portions
of the Site, with the groundwater extraction wells generally influencing the flow direction throughout the
property. Groundwater in shallow bedrock appears to be flowing to the north, east, and southeast of the Site, with
overburden groundwater flow direction being primarily to the north and east based on a more limited data set.
Groundwater contours from the November 2023 sampling round are included in Appendix B.l.
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TCE isopleths for groundwater contamination in overburden and shallow bedrock indicate that shallow
groundwater contamination does not extend beyond the Site's property boundary, and more specifically extends
to the immediate area surrounding the reconfigured Phase 1A source area and facility. Historically, VOCs were
migrating off the property to the north, east, and south and towards private domestic water supply wells prior to
activation of the IRA system in 1992.
Since the last Five-Year Review, groundwater elevation data and groundwater analytical results collected indicate
that pumping within the deep bedrock portion of the aquifer continues to prevent off-site migration of site-related
contaminants to the north, east and southeast of the Site. In these directions, nearly all off-site domestic wells and
Site perimeter deep bedrock monitoring wells either do not exhibit detectable levels of Site-related VOCs or
detected VOCs are within applicable drinking water standards. South and southwest of the Site, detections of
VOCs in deep bedrock monitoring well MW35DB and domestic wells GW14 and GW76DB (since 2013/2014)
indicate that Site-related VOCs have migrated off-site. However, no exceedances of screening criteria were
detected in water samples collected from these wells in the last 5 years. These wells further exhibit a short-term
stable trend in total VOCs and probably decreasing trend in TCE.
Further discussion of VOC concentrations detected on-Site and off-Site and analytical trends is provided in the
following section. Isopleths of TCE groundwater concentrations in bedrock, shallow bedrock, and overburden,
and a contaminant distribution map for 1,4-dioxane data spanning the last 5 years is provided in Appendix B.l.
Groundwater Monitoring: A summary of VOC trends in groundwater and discussion of arsenic and PFAS data
is provided in the following sections. Select data tables for groundwater analytical results (2023 results for VOCs,
2021 and 2023 results for PFAS, and 2021 through 2023 results for arsenic), Mann-Kendall (MK) Trends
summary tables for TCE, 1,4-dioxane, and total VOCs, the current 2023 Monitoring Program Table and 2024
Recommended Monitoring Program, and a 2024 Arsenic Sampling Schedule are included in Appendix B.2. VOC
concentration plots showing data from the last 5 years for the IRA system and reconfigured Phase 1A remedial
system are included in Appendix B.3. Additionally, groundwater data from the 2024 Quarterly Progress Report -
January to March 2024 were reviewed and taken into consideration while analyzing VOC trends.
VOCs
Below is a general summary of key VOC analytical data trends in groundwater at on-Site and off-Site locations
since 2019. Analytical tables summarizing VOC detections and exceedances from the most recent report (2023
Summary Report) are provided in Appendix B.2.
Deep Bedrock VOCs
TCE was not detected in the majority of the deep bedrock monitoring wells located immediately along the
northern, eastern, and southern property boundaries during the monitoring period, with the exception of
monitoring well MW35DB, located in the southwest part of the Site, where TCE was detected at concentrations of
24.0 |ig/L and 62.4 (j,g/L in 2023. In addition, cis-l,2-DCE was detected during both the May 2023 semi-annual
and November 2023 annual sampling events at property boundary well MW11DB (located east-northeast of
extraction wells MW15DB and MW01DB) at levels well below applicable screening criteria.
Changes in short-term concentration trends for bedrock extraction wells in 2023, when compared to 2022 short-
term trends, generally reflected changes to decreasing, probably decreasing, stable or no trend for total VOC or
TCE concentrations, specifically at wells GW08DB, MW01DB, MW14DB and MW17DB. For deep bedrock
monitoring wells, the most significant trend change was seen at well MW35DB, which changed from a decreasing
to stable condition for the total VOCs from decreasing to probably decreasing TCE concentrations and at well
MW08DB which changed from no trend for total VOC concentrations to non-detect (ND) and from stable
TCE concentrations to ND over the short term.
15
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TCE and total VOC concentrations for monitoring well MW28DB have been increasing through approximately
2016, but recent evaluations have indicated decreasing trends in total VOC and TCE concentrations. In 2023, the
total VOC concentrations were below 100 ng/L for the second year in a row since 2012. The groundwater
extraction system appears to influence groundwater in this area, based on the volume extracted by nearby
extraction well GW10DB and the notable decrease in groundwater elevation in MW28DB when compared to pre-
IRA conditions. The reductions in total VOC and TCE concentrations in deep bedrock monitoring well MW28DB
since August 2016 may be partly attributable to the placement of a Jaswell seal in and redevelopment of deep
bedrock extraction well GW10DB in August 2016.
TCE continues to be detected at MW29DB, located north-northwest of MW28DB, with one detection (0.402
|j,g/L) during the November 2023 event. The TCE concentrations in this well will continue to be monitored to
evaluate if it could be indicative of potential off-site migration.
To the north of the source area, extraction well MW15DB exhibits short-term decreasing total VOC and TCE
concentration trends. After the redrilling of the well in December 2020, well MW15DB was returned to service in
mid-May 2021, with significantly increased yields. Over 5 million gallons of water were extracted from
MW15DB in 2023, making it the second highest producing well of all the IRTS extraction wells, slightly less than
well MW14DB.
After an increase in TCE and cis-l,2-DCE concentrations at extraction well MW01DB in 2019, concentrations
from 2020 to 2023 have been consistently between 1 (j,g/L and 5 p,g/L for both TCE and cis-l,2-DCE.
Concentrations in 2023 were ND or less than 1 (j,g/L for TCE and approximately 1 ng/L for cis-l,2-DCE.
In the deep bedrock south of the source area, well MW35DB exhibited a change from decreasing to stable total
VOC concentrations and from decreasing to probably decreasing TCE concentrations. Downgradient domestic
wells GW14 and GW76DB continued to exhibit decreasing trends in total VOC/TCE concentrations over the
2019 to 2023 period. Drinking water screening criteria were not exceeded in groundwater samples collected at
these two well locations in 2023, continuing a trend first observed in August 2021.
1,4-Dioxane continues to be detected in deep bedrock including wells GW08DB, GW10DB, GW12DB,
MW01DB, MW15DB, MW21DB, MW28DB, and MW35DB. Of the two off-site domestic wells subject to low-
level 1,4-dioxane analysis (GW14 and GW76DB), 1,4-dioxane was detected in the water samples collected at
GW76DB at an estimated concentration but was not detected in the water sample collected from GW14. The
collection of annual water samples with analysis for 1,4-dioxane at GW14 and GW76DB will continue. The only
deep bedrock wells where 1,4-dioxane was detected above the 3 ng/L CTDPH screening level in 2023 were wells
GW10DB, the IRTS extraction well located beneath the main facility building, and MW35DB, to the south of the
manufacturing facility. A MK analysis of short-term (2019 through 2023) 1,4-dioxane concentrations in select
deep bedrock wells indicate no trends except for wells MW15DB and MW28DB which indicate decreasing
concentrations, and MW35DB, where the concentrations were stable.
Shallow Bedrock VOCs
Elevated VOC concentrations continued to be reported within the shallow bedrock portion of the aquifer within or
near the Phase 1A source area (i.e., at wells MWEPAASB, MW15SB, MW10SB, DW-01SB, OW-01SB and
OW-04SB). The maximum total VOC concentration detected in well DW-01SB in 2023, (347,364 p,g/L), was less
than the maximum level detected in Phase LA Area (487,142 (j,g/L at overburden extraction well FW-F35) which
was a change from 2022. However, current and historical data indicate that VOC concentrations within the
shallow bedrock portion of the aquifer decrease significantly with distance from the Phase 1A area with the
exception of MWEPAASB, located in the immediate vicinity of the source area, and MW17SB, located just to the
southeast of the source area. The MK statistics performed on historical groundwater results from shallow bedrock
wells do not display short- or long-term increasing or probably increasing trends for TCE and/or total VOCs. In
2023, VOC results at well MWEPAASB were consistent with a recent trend of increasing TCE and total VOC
concentrations that has been observed since 2010. Over that period, total VOC concentrations have increased
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from less than 50 ng/L to over 2,900 p,g/L. These concentrations, in general, remain less than the concentrations
detected in adjacent overburden well MWEPAATD but exceed the concentrations detected in well MWEPAATS.
Perimeter shallow bedrock monitoring wells did not exhibit the presence of VOCs at levels exceeding applicable
screening criteria. However, well MW29SB, located approximately 400 feet from the western property boundary
exhibited TCE at an elevated concentration of 6.74 (j,g/L in 2023. MW11SB continued to exhibit variable but
relatively low levels of TCE, with an estimated 0.349 ng/L detected in 2023. The chlorinated VOC levels at these
shallow bedrock wells will continue to be monitored closely in future sampling events.
1,4-Dioxane historically has been detected in shallow bedrock wells MWEPAASB and MW17SB, both located
near the source area. From 2015 through 2023, the detected concentrations have consistently exceeded the 0.46
Hg/L screening level in each of these wells. 1,4-Dioxane has also been detected at a level exceeding the 0.46 ng/L
screening level in well MW15SB through 2023. A MK analysis of short-term 1,4-dioxane concentrations in select
shallow bedrock wells indicates continued decreasing concentrations in well MWEPAASB and stable
concentrations in wells MW15SB and MW17SB.
Overburden VOCs
Within the overburden monitoring wells, groundwater VOC concentrations remain the highest in the vicinity of
the Phase 1A area and LSC building (e.g., at well MW26T), with total VOCs and TCE concentrations decreasing
with distance from the facility. Chlorinated VOCs have continually been detected from about 13 of the 26
overburden monitoring wells sampled in the source area. Detections of VOCs in the overburden portion of the
aquifer were predominantly at wells located in the central portion of the Site. Since the summer of 2018 when the
analytical laboratory for the LSC project was switched from Accutest to Alpha, the detection limits for most VOC
compounds have decreased to 0.5 p,g/L. Periodic detections of low-level chlorinated VOCs in Site perimeter wells
(e.g., wells MW1 IT, MW12T, MW27T and MW29T) since then may be a result of these lower detection limits.
While none of these wells exhibited any chlorinated VOC detections in 2023, the chlorinated VOC levels detected
at perimeter overburden wells will continue to be monitored closely in future sampling events.
The MK statistics performed on historical groundwater results from nearly all overburden wells displayed a
stable, decreasing, probably decreasing or no trend over the long and short terms. Monitoring well MWEPAATD
was the only overburden well which displayed a statistically increasing trend in TCE and total VOC
concentrations, with well MW17TD exhibiting an increasing long-term trend in total VOC concentrations, but a
decreasing trend in long-term TCE concentrations. Although TCE and total VOC groundwater concentrations at
overburden well MWEPAATD historically exhibits a statistically increasing trend, total VOC and TCE
concentrations in this well are now decreasing over the short term and overburden wells located further
downgradient from MWEPAATD, near the western and northern property boundaries (e.g., MW02T, MW27T,
and MW29T), have generally exhibited low or non-detectable VOC concentrations, with no trends, or stable
trends, indicating the overburden VOC plume continues to be controlled within the Site boundaries in this area.
Over the past five years, the only overburden monitoring wells that exhibited increasing total VOC and TCE
trends were wells MW04T, which is located near the source area and MW06T which changed from no trend to an
increasing concentration trend for both total VOCs and TCE.
1,4-Dioxane was detected in those overburden wells where low level 1,4-dioxane analysis was conducted, namely
MW04T, MW17TD, MW30TD, MW33T, MWEPAATS and MWEPAATD, with exceedances of the 0.46 jig/L
screening level detected in each of these wells except for MW30TD, MW33T and MWEPAATS.
Domestic Water Wells and Surface Water VOCs
While domestic water supply wells GW14 and GW76DB to the south of the property have exhibited some of the
only exceedances of drinking water standards in recent years, no exceedances were detected in groundwater
samples collected in 2023. Three of the four quarterly groundwater samples collected in 2023 from GW14 and all
of the quarterly samples collected from GW76DB in 2023 contained TCE but at concentrations below the
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CTDPH action level of 1 ng/L and well below the EPA Maximum Contaminant Level (MCL) concentration of 5
Hg/L. Cis-1,2-DCE was the only other CVOC present in the samples from these two wells at levels below the
screening criteria. 1,4-Dioxane was also detected in the water sample collected from GW76DB at an estimated
concentration (0.0522 p,g/L) well below the applicable screening criteria. Both wells are fitted with GAC systems
that treat the groundwater prior to use. The MK statistics performed on groundwater results from GW14 displayed
an increasing TCE and total VOC concentration trend for historical concentrations but decreasing trends for TCE
and total VOCs over the 2019 through 2023 period. At well GW76DB, the MK statistical analysis indicated a
stable trend for the historical total VOCs concentrations and a decreasing trend for the historical TCE
concentrations. For the short-term trends at this location, total VOCs and TCE both exhibit decreasing
concentrations trends.
Surface water samples exhibited no VOCs other than 1,4-dioxane during the review period. While 1,4-dioxane
has been detected at each of the three surface water sample locations throughout the review period, its
concentrations did not exceed screening level criteria (0.46 |ig/L).
The analytical data from the last 5 years of monitoring continues to suggest that the reconfigured Phase 1A
remedial system in the source area limits groundwater contamination in overburden and shallow bedrock from
migrating off Site. However, the IRTS has not resulted in any substantial remediation of the plume itself in these
(more) shallow aquifers and it has not prevented the migration of VOCs in deep bedrock groundwater off Site.
Detections of VOCs are consistently being observed at deep bedrock perimeter monitoring locations on Site and
at domestic bedrock water supply wells off Site to the south/southwest.
PFAS
The Fourth FYR recommended that a review be conducted to assess the potential for current and past industrial
practices at the LSC facility to contribute to potential PFAS contamination at the Site. As recommended in the
Fourth FYR, the PRP's contractor collected PFAS samples from select monitoring wells on-Site and off-Site in
January 2021 and November 2021 (TRC, 2021a). Results of the January 2021 sampling indicated that elevated
PFAS concentrations within the source area in the overburden and shallow bedrock are likely due to past disposal
activities related to the former dry-well located within the source area.
Additionally, the November 2021 Annual Monitoring Report included a total oxidizable precursor (TOP)
analysis. This TOP analysis was performed on a total of 18 wells (both on Site and off Site) to evaluate whether
oxidation produced any PFAS precursors. Trends of the TOP analysis were somewhat limited, but overall, the
analysis concluded that PFAS precursors were unlikely once oxidation was introduced. Following both sampling
events in 2021, EPA requested quarterly PFAS sampling for the reconfigured Phase 1A IRA system extraction
wells MW10SB, FW-E, and FW-I, source area overburden well MW26T, and deep bedrock extraction well
MW14DB starting in May 2023. A combination of perfluorooctane sulfonic acid (PFOS), perfluorooctanoic acid
(PFOA), and perfluorohexane sulfonic acid (PFHxS) were detected above EPA's April 2024 established MCLs1
in one or more of the reconfigured Phase 1A IRA system extraction wells. PFOS was the most predominant
chemical detected at these locations, followed by PFOA, and then PFHxS.
PFAS are present in source area till and shallow bedrock wells at levels exceeding federal and state guidance
levels. Monitoring well FW-I exceeded a sum of PFAS in 2023 of 350 ng/1. However, PFAS detections generally
do not extend beyond the source area (with the exception of relatively low-level detections at extraction well
MW14DB), and sentinel well results do not indicate that site-related PFAS are migrating off-site or impacting
1 On April 26, 2024, the EPA published its final rule on establishing individual maximum contaminant levels (MCLs) for
perfluorooctanoic acid (PFOA) and perfluorooctane sulfonic acid (PFOS) at 4.0 nanograms per liter (ng/L) and for perfluorohexane
sulfonic acid (PFHxS), perfluorononanoic acid (PFNA), and hexafluoropropylene oxide dimer acid (HFPO-DA) at 10 ng/L. In addition
to the individual MCLs, the EPA established a Hazard Index (HI) of 1 (unitless) as the MCL for any mixture containing two or more of
PFHxS, PFNA, HFPO-DA, and perfluorobutanesulfonic acid (PFBS). This final rule became effective on June 25, 2024.
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surface waters or sediment. Additional data will continue to be evaluated and collected for seasonal or other
trends and EPA will consider adding PFAS as a COC in a future decision document.
Arsenic
Arsenic data for select on-Site and off-Site locations was gathered during several sampling events between May
2021 and October 2023 to provide an updated evaluation of the established Site-specific arsenic background
concentration in groundwater originally calculated as part of the RI for the Site. The background concentration
established by the RI is 188 p,g/L. EPA initially requested additional arsenic sampling at the Site in May 2021 due
to limited arsenic data being available at that time, and the need for more data to define baseline arsenic
conditions to support an updated background concentration calculation (TRC 2022b).
Following the 2021 arsenic sampling, EPA requested continued arsenic data collection in 2022, to include the
locations originally used to define background concentrations during the RI, along with additional, select on-Site
and off-Site well locations. TRC conducted an evaluation of the arsenic background concentration established in
the RI compared to the arsenic data collected in 2021 and 2022 at the Site and concluded that the previously
established arsenic background concentration of 188 ng/L was still valid (TRC, 2022a). However, EPA
determined that the background arsenic data collected on and off Site is insufficient to conduct an evaluation of
the Site-established arsenic background concentration. EPA subsequently requested the addition of quarterly and
annual sampling of arsenic at the Site going forward, with TRC implementing arsenic sampling at select locations
on and off Site in February, May, and October in 2022 and 2023 (arsenic sampling occurred in August 2023 in
addition to the other sampling events listed for 2023).
Arsenic results from sampling events between May 2021 and October 2023 were compared to the MCL of 10
|j,g/L, the ROD cleanup level of 50 p,g/L, and the established background concentration of 188 p,g/L. Results from
these sampling events that exceeded the ROD cleanup level and/ or the established background concentration are
listed below:
• MW14DB at a concentration of204.6 p,g/L in February 2023:
o This concentration is anomalous when compared to historical results that were typically below the MCL.
The pitless adapter seal may have been compromised during replacement of the well's pump in January
2023, which could have caused the pump discharge to enter the well and influenced the concentration
detected during the February 2023 sampling round. This pitless adapter was changed in May 2023 as part of
ongoing work to convert this location into a potable water source for LSC, with arsenic concentrations in
groundwater samples collected after this change being consistent with concentrations observed below the
MCL before the January 2023 pump replacement.
• MW10SB at a concentration of 449.1 ng/L in May 2021 and 465.8 ng/L in October 2022:
o MW10SB is a shallow bedrock extraction well that is part of the reconfigured Phase 1A remedial system
located within the source area. This location was sampled in October 2023 and had a concentration above
the MCL, but below both the ROD Cleanup Level and the Site-established RI value.
• DW-01SB, OW-01SB, and OW-04SB at concentrations of 123.6 |ig/L, 798.3 |ig/L, and 310.2 (j,g/L (duplicate
was 321.3 p,g/L), respectively, in November 2021;
o All 3 locations are shallow bedrock wells within the source area and are some of the locations originally
used as part of the original background concentration calculations used in the RI.
Deep bedrock samples collected since May 2021 do not indicate concentrations of arsenic generally above MCLs
or risk to potable, deep bedrock water supply wells off Site outside of GW14 (where both treated and untreated
samples had concentrations above the MCL and the owner declined installation of a point-of-use system in 2022
and 2023). Furthermore, the highest detections of arsenic at the Site have been within or near the source area in
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overburden and shallow bedrock groundwater and could be affected by ongoing remedial actions from the Phase
1A remedial system.
EPA has requested that arsenic sampling continue per the 2024 Arsenic Sampling Schedule (See Appendix B.2)
until enough data is collected to support an updated calculation of the Site-established arsenic background
concentration in groundwater.
VOCs Mass Recovery and Groundwater Extraction Rates
VOC mass removal and groundwater extraction rates for the reconfigured Phase 1A remedial system extraction
wells improved after completion of updates to the pumping/extraction system in 2016; however, the initial
improvement of the reconfigured Phase 1A remedial system extraction rates and total VOC mass removal has
remained relatively steady since 2019. Extraction rates and VOC mass recovery for the IRA system over the last 5
years appear to be generally stable, with a slight decrease in total VOC mass removed from deep bedrock since
2019 that has since appeared to have leveled out through 2023. Table 3 summarizes VOC mass removal in both
the reconfigured Phase 1A remedial system extraction wells and the deep bedrock extraction wells part of the IRA
system. Table 4 summarizes the average extraction rates of both systems since 2019.
Table
i. Summary of VOC Mass Removal
Year
Deep Bedrock
TCE Mass
Removed (lb)
Deep Bedrock
Total VOCs
Mass Removed
(lb)
Reconfigured
Phase 1A TCE
Mass Removed
(lb)
Reconfigured
Phase 1A Total
VOCs Mass
Removed (lb)
Total
Cumalitive
VOCs Mass
Recovered (lb)
2019
2.88
26.70
16.68
33.70
2,499
2020
2.00
15.13
21.26
37.56
2,552
2021
3.22
15.96
22.20
44.07
2,612
2022
2.65
11.91
19.06
36.35
2,660
2023
2.56
14.03
30.51
46.11
2,720
Table 5. Summary of Extraction Rates
Year
Sum of Average
Extraction Rates for
IRA System (gpm)
Sum of Average
Extraction Rates for
Reconfigured Phase
1A Wells (gpm)
Sum of Average
Extraction Rates for
Both IRA and
Reconfigured Phase
1A Systems (gpm)
2019
0.30
28.20
28.50
2020
0.23
28.32
28.56
2021
0.29
31.05
31.34
2022
0.27
29.79
30.06
2023
0.34
28.30
28.64
Site Inspection
The inspection of the Site was conducted on April 24,2024. In attendance were John Bryant and Courtney Carroll
(EPA), Michael Senyk (CT DEEP), Diane Stallings and Chris Carlson (TRC), Joseph J. Carlone Sr., Joseph J.
Carlone Jr., Tim Carlone, Steve Whitney, and Steve Radcliffe (LSC), A1 Smith and Rich Basile (Murtha Cullina,
hired by LSC), Angela McGinty (EA Engineering), and Chris Vignola (Sanborn, Head & Associates). The
purpose of the inspection was to assess the protectiveness of the remedy.
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No problems were noted during the Site inspection. John Bryant reached out to LSC and TRC on April 26,2024
and June 13,2024 regarding remaining questions2 from the Site Inspection form prepared as part of the April 24,
2024 site visit. This information was not provided; however, this does not bring into question the effectiveness of
the remedy. The system is operating properly and appears to be well maintained. The asphalt paving in the
reconfigured Phase 1A source area is worn in places and shows moderate weathering though still appears to be
protective of the source area. Appendix D includes a completed Site Inspection form and a photolog.
V. TECHNICAL ASSESSMENT
QUESTION A: Is the remedy functioning as intended by the decision documents?
Question A Summary:
No. Similar to the Fourth-Five Year Review, the current configuration of the IRTS is not fully effective in
preventing the migration of contaminants in deep bedrock from the source area. Although there has been
consistent removal of contaminants from groundwater, contaminated groundwater on-Site has not been restored to
drinking water standards and, in some cases, concentrations have either increased or remained constant. Due to
the low air permeability of the source area's subsurface soil, active vacuum extraction of the VOCs from source
area soil was discontinued and documented in the 2004 ESD. While the IRTS system does remove aqueous VOCs
within the source area, VOCs in unsaturated soil remain unaddressed, prolonging the time until RAOs can be
achieved. Also, groundwater contaminated with VOCs continues to migrate beyond the Site's property boundary
impacting private wells to the south/southwest. Additional investigations were performed in 2017 to better
characterize contaminant migration in the deep bedrock to the south and provide current characterization of VOCs
within the source area soil. This information was used by LSC to submit a finalized FFS report in October 2023
that evaluated options to improve source control and management of migration.
Following the finalized FFS submittal, EPA released a Proposed Plan for public comment in December 2023 that
presented its preferred Remedial Alternative which involves chemical oxidation in deep soils through direct soil
mixing with oversized augers and utilizing direct injection of the chemical oxidizer in the source area under the
manufacturing building. Expansion of the IRA system was also proposed, and upon implementation, it would
further limit, capture, and extract impacted groundwater closer to the source area to limit contaminant migration
from shallow soil and bedrock to deeper bedrock. In addition, implementation of an expanded set of institutional
controls was proposed that requires a vapor intrusion evaluation be performed if there is construction of a new
building at the Site, or if an existing building is renovated over the source area. The expanded set of institutional
controls would also include a requirement that existing residential point-of-use treatment systems continue to be
operated and maintained until final groundwater cleanup levels are achieved. Additionally, groundwater
monitoring is proposed to continue, with the potential for new monitoring wells to be installed to monitor and
assess the performance of the final remedy in the source area and management migration area. Lastly, Five-Year
Reviews would continue to be implemented to assess protectiveness and the progress of the final remedy. EPA
has reviewed the comments received during the public comment period and is in the process of drafting a decision
document that will amend the 1993 ROD.
As mentioned above, the IRTS system is operating, and current procedures exist and are being followed for the
continued function of the extraction and treatment systems. As detailed previously, there have been no major
equipment breakdowns that occurred during the review period and all necessary maintenance was performed
promptly. Routine maintenance procedures are performed by LSC to limit system problems and corresponding
2 The remaining questions involve O&M and OSHA Training Records, Air and/or Water (effluent) Discharge Compliance
Records, and information involving O&M costs and record availability.
21
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system downtime. LSC personnel inspect and record measurements for both IRA and reconfigured Phase IA
remedial systems on a regular basis. No O&M cost information was obtained.
ICs are in place to limit or prohibit the use of untreated groundwater on the Site and prohibit exposure to
contaminated soils. During the Site inspection, there were no indications of potential exposure to contaminated
soil or use of untreated water. Fencing and signage are in place and effective to the degree designed. Based on the
data review, Site inspection, and Site interviews, no immediate threats have been identified.
QUESTION B: Are the exposure assumptions, toxicity data, cleanup levels, and remedial action objectives
(RAOs) used at the time of the remedy selection still valid?
Question B Summary:
No. Not all the exposure assumptions and toxicity data used at the time of the remedy selection are currently
valid. Some toxicity values, exposure assumptions, exposure pathways to be considered, methods of evaluating
risk, and potential standards have changed since the time of the remedy selection. These changes described in the
sections below do not affect the current protectiveness of the remedy, because the IRTS system continues to
remove aqueous VOCs within the source area and ICs are in place which prevent use of impacted groundwater.
Additionally, EPA expects to modify the remedy to further limit potential for contaminant migration. Any
decision document modifying the 1993 ROD will consider whether the RAOs and any potential standards need to
be updated.
Changes in Standards and TBCs
New standards (federal or state statutes and/or regulations), as well as new TBC guidances, should be considered
during the five-year review process as part of the protectiveness determination. Under the NCP, if a new federal
or state statute and/or regulation is promulgated or a new TBC guidance is issued after the ROD is signed, and, as
part of the five-year review process it is determined that the standard needs to be attained or new guidance
procedures followed to ensure that the remedy is protective of human health and the environment, then the five-
year review should recommend that a future decision document be issued that adds the new standard as an ARAR
or guidance as a TBC to the remedy.
EPA guidance states:
"Subsequent to the initiation of the remedial action new standards based on new scientific information or
awareness may be developed and these standards may differ from the cleanup standards on which the remedy was
based. These new ... [standards] should be considered as part of the review conducted at least every five years
under CERCLA §121 (c) for Sites where hazardous substances remain on-site. The review requires EPA to assure
that human health and the environment are being protected by the remedial action. Therefore, the remedy should
be examined in light of any new standards that would be applicable or relevant and appropriate to the
circumstances at the Site or pertinent new [standards], in order to ensure that the remedy is still protective. In
certain situations, new standards or the information on which they are based may indicate that the Site presents a
significant threat to health or environment. If such information comes to light at times other than at the five-year
reviews, the necessity of acting to modify the remedy should be considered at such times." (See CERCLA
Compliance with Other Laws Manual: Interim Final (Part 1) EPA/540/G-89/006 August 1988, p. 1-56.)
As part of this FYR, ARARs and To Be Considered guidance (TBCs) set forth in the 1993 ROD were reviewed to
identify any newly promulgated or modified standards that may affect the protectiveness of the remedy. The
following paragraphs discuss only those ARARs (including any newly promulgated standards) or TBCs that have
changed since issuance of the ROD.
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Safe Drinking Water Act (SDWA)
The MCL for arsenic has been reduced from 50 \ig/L to 10 \ig/L since issuance of the 1993 ROD.
As discussed above, background levels of arsenic were identified in the 1992 RI Report as being above the MCL
of 50 ug/L. As a result, no treatment for arsenic was incorporated into the ROD. Additional sampling is
underway to collect sufficient data to be used to calculate an updated Site-specific background concentration for
arsenic in groundwater. Once the arsenic background concentration is determined, EPA will consider whether to
modify the cleanup level for arsenic in a future decision document. Other than arsenic, no additional changes to
existing or newly developed MCLs have occurred since the time of the remedy selection for existing ROD
COCs.
Connecticut Remediation Standard Regulations (Section 22a-133k-l through 22a-133k-3 of the Regulations of
Connecticut State Agencies)
The Connecticut Remediation Standard Regulations (RSRs) were promulgated in 1996 and amended in 2013
and 2021 (CT DEEP, 2021). While the RSRs were not included as an ARAR at the time of the ROD, they are
currently being used at the LSC Site for monitoring and evaluation purposes. The RSR criteria being evaluated
for groundwater include the Groundwater Protection Criteria (GWPC), the Surface Water Protection Criteria
(SWPC), and the Groundwater Volatilization Criteria (GWVC). The 2023 FFS includes an evaluation of the
existing 1993 ROD COCs and their respective RSR criteria. As part of the evaluation of potential modifications
to the source control and management of migration components of the remedy, EPA also evaluated the existing
ROD COCs and their cleanup levels and whether any new COCs should be incorporated into the remedy. EPA
intends to finalize this evaluation in a future decision document selecting a modified remedy for the Site.
PFAS Activities at Linemaster Switch Corporation Superfund Site
The purpose of this section is to present current information related to PFAS activities at the Site and to evaluate
whether there are any potential impacts to remedy protectiveness from PFAS. The following subsections discuss
the relevant PFAS toxicity values and standards that are currently available, followed by a discussion of Site
activities related to PFAS and protectiveness conclusions.
On April 10,2024, EPA issued MCLs for six PFAS contaminants, including PFOA, PFOS, PFNA, HFPO-DA
(Gen-X), PFHxS, and PFBS:
PFAS compound
MCL
Maximum Detected Concentrations
(February 2024)
Perfluorohexanesulfonic acid (PFHxS)
10
ng/L
25.4 ng/1 in IRTS Monitoring Well
Perfluorononanoic acid (PFNA)
10
ng/L
6.31 ng/1 in FW-E
Perfluorooctanoic acid (PFOA)
4 ng/L
66.4 ng/1 in FW-E
Perfluorooctanesulfonic acid (PFOS)
4 ng/L
160 ng/1 in FW-E
Hexafluoropropylene oxide dimer acid (HFPO-DA)
10
ng/L
Not sampled
Mixtures containing two or more of PFHxS, PFNA, HFPO-
DA, and PFBS
HI = 1
IRTS Monitoring Well HI = 2.5 (PFBS,
PFHxS)
23
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The comparison table is based on information provided in the 2024 Q1 Progress Report for the Site. HFPO-DA is not included in the
comparison table because sampling results for HFPO-DA were not provided in the 2024 Q1 Progress Report.
PFAS Toxicity Values
This section presents the toxicity values that EPA currently has available for PFAS compounds.
2024 Cancer and Non-cancer Toxicity Values for PFOA and PFOS
On April 10,2024, EPA issued new MCLs for PFOA and PFOS (4 ppt individually) which utilize updated
toxicity values for cancer and non-cancer effects developed by EPA Office of Water. The new oral cancer slope
factors (SFOs) are 2.93 x 10"4 [mg/kg/day]1 and 3.95 x 101 [mg/kg/day]1. For non-cancer, the new oral reference
dose (RfD) values are 3 x 10"8 (mg/kg/d) for PFOA and 1 x 10"7 (mg/kg/d) for PFOS. It is noted that toxicity
values for PFHxS, PFNA, HFPO-DA (Gen-X), and PFBS are not changed with the new MCLs.
2023 Non-cancer Toxicity Values for PFODA, PfTetA, PFDoDA, PFUDA, PFHxA, PFPrA, HQ-115
In November 2023, EPA adopted new RfD values for multiple PFAS compounds based on toxicity values
developed by the State of Wisconsin Department of Health Services which include: Perfluorooctadecanoic acid
(PFODA) 4 x 10"2 mg/kg-day, Perfluorotetradecanoic acid (PFTetA) 1 x 10"3 mg/kg-day, Perfluorododecanoic
acid (PFDoDA) 5 x 10"5 mg/kg-day, and Perfluoroundecanoic acid (PFUDA) 3 x 10"4 mg/kg-day.
Additionally, new oral RfD values were released for two PFAS compounds based on toxicity values published by
the EPA Office of Research and Development (ORD) which include Perfluoropropanoic acid (PFPrA) 5 x 10"4
mg/kg-day and Lithium bis[(trifluoromethyl)sulfonyl]azanide (HQ-115) 3 x 10"4 mg/kg-day, also known as 1,1,1-
Trifluoro-N-(trifluoromethanesulfonyl)methanesulfonamide (TFSI).
These values were determined to be based on similar methods and procedures as those used for other Tier 3
toxicity values. It is noted that currently there are no analytical methods available for the two ORD compounds
PFPrA and HQ-115/TFSI.
In April 2023, EPA released a new RfD of 5 x 10"4 mg/kg-day for Perfluorohexanoic acid (PFHxA) based on an
Integrated Risk Information System (IRIS) value.
Analytical results for these PFAS compounds were not included in the 2024 Q1 Progress Report for the Site; thus,
comparative Site data is not available for the most recent Site sampling results. However, the current
protectiveness of the remedy is not affected because ICs are in place to prohibit the use of the groundwater until
the cleanup levels are met.
2022 Non-cancer Toxicity Values for PFBA
In December 2022, EPA released a new RfD of 1 x 10"3 mg/kg-day for Perfluorobutanoic acid (PFBA) based on a
new IRIS value.
Analytical results for PFBA were not included in the 2024 Q1 Progress Report for the Site; thus, comparative Site
data is not available for the most recent Site sampling results. However, the current protectiveness of the remedy
is not affected because ICs are in place to prohibit the use of the groundwater until the cleanup levels are met.
PFAS State Standards
Connecticut has not promulgated drinking water or groundwater standards for PFAS. In June 2022, CT DPH
updated its guidance on drinking water action levels to include four PFAS compounds and added six additional
compounds in June 2023.
• PFOA (16 ng/L)
• PFOS (10 ng/L)
24
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• PFNA (12 ng/L)
• PFHxS (49 ng/L)
• PFHxA (240 ng/L)
• GenX (19 ng/L)
• PFBS (760 ng/L)
• PFBA (1,800 ng/L)
• 6:2 chloropolyfluoroether sulfonic acid (2 ng/L)
• 8:2 chloropolyfluoroether sulfonic acid (5 ng/L)
Summary of Site PFAS Activities
Initial sampling and analysis of PFAS was conducted in January 2021 and November 2021. Results of the 2021
sampling events indicate that elevated concentrations of PFAS are present in overburden and bedrock wells.
Following these sampling events, EPA requested quarterly PFAS sampling for reconfigured Phase 1A remedial
system extraction wells MW10SB, FW-E, and FW-I, source area overburden well MW26T, and deep bedrock
extraction well MW14DB starting in May 2023. PFOS, PFOA, and PFHxS were detected above current EPA
MCL values during PFAS sampling in 2023 and 2024. Additionally, results for 2024 Q1 indicate that mixtures of
PFBS and PFHxS exceed HI 1 in the IRTS monitoring well. The detections of PFAS above MCLs do not impact
remedy protectiveness because impacted groundwater is not being used as drinking water.
The PFAS data collected to date indicates that site-related PFAS in groundwater is limited to shallow bedrock and
overburden within the source area. There is no indication that these or other site contaminants are migrating to
surface water or sediment in Pond 3 or the wetlands to the West of the source area. Ecological receptors are not
likely to be affected because site contaminants are not reaching ecologically relevant media (i.e., surface water or
sediment).
To monitor any change in PFAS conditions, additional data collection to support delineation of PFAS
contamination on Site is scheduled to continue per the 2023 Monitoring Program with modifications from the
2024 Recommended Monitoring Program. EPA will continue to evaluate PFAS contamination on Site and
consider whether to add it as a COC in a future decision document.
1,4-Dioxane at Linemaster Switch Corporation Superfund Site
There is no current federal MCL for 1,4-dioxane. Using 2013 updated IRIS toxicity information and the standard
Superfund risk assessment approach, EPA's carcinogenic risk range of 10"6 to 10"4 for 1,4-dioxane equates to a
concentration range of 0.46 to 46 |xg/L (parts per billion, or ppb).
1,4-Dioxane was not identified as a COC in the 1993 ROD. Following the 2009 FYR, 1,4-dioxane was added to
the reporting list for VOC analyses for the annual monitoring events beginning in May 2010, using a reporting
limit consistent with the then available RSR proposed GWPC of 21 |xg/L. 1,4-Dioxane has historically only been
detected in the monitoring wells at the center of the Site, adjacent to the LSC facility and the groundwater
treatment system.
In February 2012, Connecticut Department of Public Health (CT DPH) set a new drinking water Action Level of
3 |xg/L. Because of this new value, all of the residential wells were re-sampled in April 2012 using a method
detection limit of 3 |xg/L. The results of this sampling indicated no detections above the action limit of 3 (xg/L in
the residential wells.
1,4-Dioxane has been detected in overburden, shallow bedrock, and deep bedrock groundwater at concentrations
above EPA's carcinogenic risk range. The most recent concentrations of 1,4-dioxane range from below detection
limits to 161 jxg/L in monitoring well MW17SB during the November 2023 sampling event. 1,4-Dioxane does not
exceed EPA's carcinogenic risk range in any residential production well. As reported in the 2024 Quarter One
Progress Report, untreated and post treatment samples from the on-Site production well GW08DB were the only
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samples analyzed for 1,4-dioxane during the February 2024 monitoring event. 1,4-Dioxane was detected in both
samples at concentrations of 0.264 |ig/L (primary) and 0.282 |ig/L (duplicate) in the untreated sample, and 0.257
(xg/L in the post-treatment sample. The detection of 1,4-dioxane does not affect the current protectiveness of the
remedy because ICs are in place to prohibit the use of the groundwater until the cleanup levels are met. However,
as a result of the 2021 Supplemental Risk Assessment indicating that concentrations exceed the EPA cancer risk
range, 1,4-dioxane should be added as a COC.
Floodplain
Federal Floodplain Management: Federal regulations at 40 CFR Part 6, Appendix A identified in the ROD were
withdrawn. Furthermore, these regulations, and therefore the current CERCLA remedy, only addressed potential
floodplain impacts up to the 100-year flood elevation. Current federal floodplain regulations at 40 CFR Part 9
require a greater assessment of potential floodplain impacts, including preventing the release of contamination
from waste management units and other remedial infrastructure up to the 500-year floodplain elevation. EPA has
assessed potential floodplain impacts from a 500-year flood event on the extent of the Site including subsurface
features (i.e., monitoring wells, extraction wells, and other elements of the remedial system).
Because EPA has not identified any floodplain-related protectiveness issues at this time, we do not include a
recommendation to add this requirement as an ARAR in a future determination.
Changes in Toxicity and Other Contaminant Characteristics
Since the baseline HHRA was conducted as part of the RI, EPA has re-examined and updated toxicity factors,
including RfDs, RfCs, CSFs, and IURs for some of the evaluated contaminants. These toxicity factors were used
in the calculations of risk in the baseline HHRA (conducted as part of the RI) and the supplemental HHRA
(2021).
The following table provides current toxicity factors for COCs identified in the ROD and found in the 2021
Supplemental HHRA:
COC
RfD
RfC
CSF
IUR
2019
2024
2019
2024
2019
2024
2019
2024
Arsenic
3.0E-04
3.0E-04
1.5E-05
1.5E-05
1.5E+00
1.5E+00
4.3E-03
4.3E-03
Carbon tetrachloride
4.0E-03
4.0E-03
1.0E-01
1.0E-01
7.0E-02
7.0E-02
6.0E-06
6.0E-06
1,2-Dichloroethane
6.0E-03
6.0E-03
7.0E-03
7.0E-03
9.1E-02
9.1E-02
2.6E-05
2.6E-05
1,1 -Dichloroethene
5.0E-02
5.0E-02
2.0E-01
2.0E-01
-
-
-
-
cis-1,2-Dichloroethene
2.0E-03
2.0E-03
-
4.0E-02
-
-
-
-
trans-1,2-Dichloroethene
2.0E-02
2.0E-02
-
4.0E-02
-
-
-
-
1,2-Dichloropropane
4.0E-02
4.0E-02
4.0E-03
4.0E-03
3.7E-02
3.7E-02
3.7E-06
3.7E-06
1,4-Dioxane
3.0E-02
3.0E-02
3.0E-02
3.0E-02
1.0E-01
1.0E-01
5.0E-06
5.0E-06
Ethylbenzene
1.0E-01
5.0E-02
1.0E+00
1.0E+00
1.1E-02
1.1E-02
2.5E-06
2.5E-06
T etrachloroethene
6.0E-03
6.0E-03
4.0E-02
4.0E-02
2.1E-03
2.1E-03
2.6E-07
2.6E-07
Toluene
8.0E-02
8.0E-02
5.0E+00
5.0E+00
-
-
-
-
1,1,2-T richloroethane
4.0E-03
4.0E-03
2.0E-04
2.0E-04
5.7E-02
5.7E-02
1.6E-05
1.6E-05
Trichloroethene
5.0E-04
5.0E-04
2.0E-03
2.0E-03
4.6E-02
4.6E-02
4.1E-06
4.1E-06
Vinyl chloride
3.0E-03
3.0E-03
1.0E-01
1.0E-01
7.2E-01
7.2E-01
4.4E-06
4.4E-06
Xylenes
2.0E-01
2.0E-01
1.0E-01
1.0E-01
-
-
-
-
The compounds listed below include contaminants identified in the ROD or detected in recent (February 2024)
monitoring for which new toxicity values are now available.
2022 cis-1,2-Dichloroethene Non-Cancer Toxicity Value
In October 2022, EPA released a non-cancer RfC of 4.00E-02 mg/m3 for cis-1,2-DCE, based on a provisional peer
reviewed toxicity value (PPRTV) screening value. Previously, no RfC was available for Cis-1,2-DCE. The
interim cleanup level in the 1993 ROD for cis-1,2-DCE is the federal MCL which is 70 |xg/L.
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As reported in the 2024 Q1 Progress Report, the sampling and analysis of cis-l,2-DCE was included in the
February 2024 monitoring event. During this monitoring event, cis-l,2-DCE was detected in samples collected
from the IRTS influent and the IRTS final discharge at concentrations of 50 |j,g/L and 0.28 p,g/L, respectively;
however, it was not detected (at a reporting limit of 1.0 p,g/L) in the sample collected from the IRTS effluent. Cis-
1,2-DCE was detected in samples collected from five of the six deep bedrock extraction and monitoring wells at
concentrations ranging from 0.314 (j,g/L (MW06DB) to 1,140 |j,g/L (GW10DB). Cis-1,2-DCE was detected in the
untreated sample collected from the production well (GW08DB) at a concentration of 18.2 (xg/L; however, it was
not detected (at a reporting limit of 0.50 p,g/L) in the three post-treatment samples. Lastly, cis-l,2-DCE was
detected in samples collected from two of the fourteen domestic water supply wells: a concentration of 4.6 |j,g/L
was detected in the sample collected from GW14, and concentrations of 6.8 |j,g/L and 7.0 |j,g/L (primary,
duplicate) were detected in the samples collected from GW76DB.
As detailed above, results of the February 2024 monitoring event indicate one exceedance of the MCL in the
sample collected from the deep bedrock extraction well GW10D. However, the single MCL exceedance and other
detections of cis-l,2-DCE do not impact the current protectiveness of the remedy because ICs are in place to
prohibit the use of the groundwater.
2020 Trans-l,2-dichloroethene non-cancer toxicity value
In November 2020, EPA finalized a new RfC for trans-1,2-DCE based on a new PPRTV. There previously was
no RfC for trans-1,2-DCE. 1,2-DCE is a potential future COC based on detections in groundwater. The federal
MCL is 100 |J,g/L.
As reported in the 2024 Q1 Progress Report, the sampling and analysis of trans-1,2-DCE was included in the
February 2024 monitoring event. During this monitoring event, trans-1,2-DCE was detected in the sample
collected from the IRTS influent at a concentration of 1.6 jxg/L; however, it was not detected (at a reporting limit
of 1.5 p,g/L) in the samples collected from the IRTS effluent and the IRTS final discharge. Trans-1,2-DCE was
detected in samples collected from three of the six deep bedrock extraction and monitoring wells at concentrations
of ranging from 0.295 |j,g/L (MW15DB) to 30.3 p,g/L (GW10DB). Trans-1,2-DCE was detected in the untreated
sample collected from the on-Site production well (GW08DB) at a concentration of 0.595 jxg/L; however, it was
not detected (at a reporting limit of 0.50 p,g/L) in the three post-treatment samples. Lastly, trans-1,2-DCE was not
detected in samples collected from the fourteen domestic water supply wells.
Detections of trans-1,2-dichloroethene do not impact the current protectiveness of the remedy because ICs are in
place to prohibit the use of groundwater.
Changes in Risk Assessment Methods
There have been no notable changes in risk methodologies since the previous FYR.
Changes in Exposure Pathways
There have been no notable changes in exposure pathways since the previous FYR.
EPA Regional Screening Levels
EPA Regional Screening Levels (SLs) are risk-based concentrations derived by combining exposure information
assumptions with EPA toxicity data. EPA RSLs are updated twice a year. The most up-to-date tables as available
at: https://www.epa.gov/risk/regional-screening-levels-rsls-generic-tables.
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Methods for Evaluating Vapor Intrusion
EPA Guidance on Vapor Intrusion
The most current guidance available to evaluate risk from vapor intrusion is the EPA 2015 Vapor Intrusion
Technical Guide. The guidance emphasizes the use of multiple lines of evidence to evaluate the potential for
vapor intrusion. This guidance was considered when assessing the potential for vapor intrusion during the FYR
process. This resource can be found at: https://www.epa.gov/sites/default/files/2015-09/documents/oswer-vapor-
intrusion-technical-guide-final.pdf
EPA VISL Calculator
The EPA online VISL calculator is a web-based tool which can be used to obtain risk-based screening level
concentrations for groundwater, sub-slab soil gas, and indoor air. The VISL calculator uses the same database as
the Regional Screening Levels for toxicity values and physiochemical parameters and is automatically updated
during the semi-annual RSL updates. Please see the User's Guide for further details on how to use the VISL
calculator, https://www.epa.gov/vaporintrusion/vapor-intrusion-screening-level-calculator
Vapor Intrusion Investigations for the Linemaster Switch Corporation Supetfund Site
The vapor intrusion indoor air inhalation pathway was not included in the baseline human health risk assessment
submitted for consideration in the ROD. A vapor intrusion investigation, including sub-slab and indoor air
sampling at two residential buildings (referred to as building #105 and #111) located to the north of the LSC
facility, was conducted in 2011. A risk evaluation was performed using the sub-slab and indoor air data that was
collected in 2011, which concluded that there were no unacceptable human health risks due to vapor intrusion.
However, due to detections of TCE in the sub-slab, a vapor mitigation system was installed in building #105 and
a vapor barrier was installed in building #111.
Although maximum site groundwater TCE and vinyl chloride concentrations continue to exceed residential
groundwater VISLs, the vapor mitigation system and vapor barrier are in place at Building #105 and #111 to
prevent a complete exposure pathway. A review of current Site information does not identify any current vapor
intrusion concerns; however, if there is a change in site conditions or land use that suggest a VI pathway could
develop, a re-evaluation may be needed.
QUESTION C : Has any other information come to light that could call into question the protectiveness
of the remedy?
Question C Summary:
The expected impacts of climate change in New England pose increasing risks to contaminated sites.
Increases in air and water temperature, precipitation, flooding, and periods of drought may result in
altered fate and transport pathways and exposure assumptions, impaired aquatic habitats, dispersal of
contaminants, damage to remediation related structures, and ultimately ineffective remedies. At coastal
sites, saltwater impacts made more likely by sea-level rise may cause corrosion of remediation
equipment and impair restoration efforts. Increased frequency of extreme weather events may cause
damage or releases at sites, impairing remedial efforts where remedies have not been adequately
designed to protect against these risks.
EPA will continue to protect human health and the environment by reducing risks from climate change
impacts. Potential Site impacts from climate change have been evaluated, and the performance of the
remedy is currently not at risk due to the expected effects of climate change in the region and near the
Site. The Site is located outside of the FEMA Zone A 100-year flood zone. Climate change in New
England is not expected to alter the protectiveness of the remedy at the Site because the remedy is
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relying on a groundwater extraction and treatment system, institutional controls, and groundwater
monitoring.
VI. ISSUES/RECOMMENDATIONS
OL'(s) without Issucs/Rccommcndations Identified in the Five-Year Review:
None
Issues and Recommendations Identified in the Five-Year Review:
OU(s):
Issue Category: Remedy Performance
Issue: Contaminated groundwater continues to migrate south of the Site and
contaminant concentrations remain elevated in the Source Area. Improved source
control and management of migration measures would accelerate soil and
groundwater remediation and more effectively capture groundwater contaminant
migration to reduce exposure risk at off-Site potable wells.
Recommendation: Modify the source control and management of migration
components of the existing remedy through a future decision document.
Affect Current
Protectiveness
Affect Future
Protectiveness
Party
Responsible
Oversight Party
Milestone Date
No
Yes
EPA
EPA/State
12/31/2025
OU(s):
Issue Category: Monitoring
Issue: PFAS contaminants have been detected in groundwater monitoring and
extraction wells above federal MCLs.
Recommendation: Continue to conduct PFAS sampling in groundwater at the
Site. EPA will evaluate whether any PFAS contaminants should be incorporated
into the remedy as COCs.
Affect Current
Protectiveness
Affect Future
Protectiveness
Party
Responsible
Oversight Party
Milestone Date
No
Yes
PRP
EPA/State
12/31/2026
29
-------
OU(s):
Issue Category: Monitoring
Issue: 1,4-Dioxane has been detected in groundwater monitoring and extraction
wells at concentrations above EPA's carcinogenic risk range.
Recommendation: Continue to conduct 1,4-dioxane sampling in groundwater at
the Site and incorporate into the remedy as a COC.
Affect Current
Protectiveness
Affect Future
Protectiveness
Party
Responsible
Oversight Party
Milestone Date
No
Yes
PRP
EPA/State
12/31/2025
OU(s):
Issue Category: Remedy Performance
Issue: The Rl-established arsenic background concentration for groundwater at
the Site needs to be updated.
Recommendation: Continue to conduct arsenic sampling in groundwater at the
Site until enough data is collected to support an updated evaluation and
calculation of the appropriate background arsenic concentration for the Site.
Affect Current
Protectiveness
Affect Future
Protectiveness
Party
Responsible
Oversight Party
Milestone Date
No
Yes
PRP
EPA/State
12/31/2026
OTHER FINDINGS
None
30
-------
VII. PROTECTIVENESS STATEMENT
Protectiveness Determination:
Short-term Protective
Planned Addendum
Completion Date:
9/13/2024
Protectiveness Statement:
The remedy is protective of human health and the environment in the short term. There are no current
unacceptable exposure risks to Site contaminants. Institutional controls to restrict groundwater use and
prohibit excavation at the facility have been established. Contaminated groundwater used for potable
supply is treated as necessary. For the remedy to be protective in the long-term, the following actions
need to be taken to ensure protectiveness: 1) modify the remedy to address the continuing migration of
contaminated groundwater and elevated contaminant concentrations in the Source Area; 2) continue
PFAS sampling and analysis to determine whether any PFAS contaminants should be incorporated into
the remedy as COCs; 3) issue a future decision document to incorporate 1,4-dioxane into the remedy as
a COC; and 4) continue to collect arsenic sampling data to support an updated calculation of the
appropriate site-specific background concentration.
The next five-year review report for the Linemaster Switch Corporation Superfund Site is required five years from
the completion date of this review.
VIII. NEXT REVIEW
31
-------
Appendix A
Reference List
-------
APPENDIX A - REFERENCE LIST
Fuss & O'Neill, 1992. Draft Remedial Investigation/Feasibility Study, Linemaster Switch Corporation,
Woodstock, Connecticut. Fuss & O'Neill, August 1992, revised December 1992.
Fuss & O'Neill, 1999. 1998 Annual Monitoring Report, Interim Removal Action, Linemaster Switch
Corporation, Woodstock, Connecticut. Fuss & O'Neill, March 1999.
M. Grippo, J. Hayse, I. Hlohowskyj, and K. Picel. 2021. Derivation of PFAS Ecological Screening
Values, Environmental Science Division, Argonne National Laboratory, September 2021.
TRC, 2018a. 2017 Site Investigation Report - Deep Well Installation Source Area Investigation,
Conceptual Site Model Update, and Remedial Alternative Screening. TRC Environmental Corporation,
Linemaster Switch Corporation, Woodstock, Connecticut. February 2018.
TRC, 2018b. 2017 Annual Monitoring Report. TRC Environmental Corporation, Linemaster Switch
Corporation, Woodstock, Connecticut. March 2018.
TRC, 2020. 2019 Annual Monitoring Report. TRC Environmental Corporation, Linemaster Switch
Corporation, Woodstock, Connecticut. March 2020.
TRC, 2021a. Per- and Polyfluoroalkyl Substances (PFAS) Sampling Report. TRC Environmental
Corporation, Linemaster Switch Corporation, Woodstock, Connecticut. February 2021.
TRC, 2021b. 2020 Annual Monitoring Report. TRC Environmental Corporation, Linemaster Switch
Corporation, Woodstock, Connecticut. March 2021.
TRC, 2021c. Supplemental Human Health Risk Assessment. TRC Environmental Corporation,
Linemaster Switch Corporation, Woodstock, Connecticut. February 2021, revised June 2021.
TRC, 2022a. Evaluation of the Established Arsenic Background Concentration. Linemaster Switch
Corporation, Woodstock, Connecticut. January 2022.
TRC, 2022b. 2021 Annual Monitoring Report. TRC Environmental Corporation, Linemaster Switch
Corporation, Woodstock, Connecticut. March 2022.
TRC, 2023a. 2022 Annual Monitoring Report. TRC Environmental Corporation, Linemaster Switch
Corporation, Woodstock, Connecticut. March 2023.
TRC, 2023b. Focused Feasibility Study Report. TRC Environmental Corporation, Linemaster Switch
Corporation, Woodstock, Connecticut. January 2020, Revised October 2020, January, April, and
September 2023, Finalized October 2023.
TRC, 2024a. 2023 Annual Monitoring Report. TRC Environmental Corporation, Linemaster Switch
Corporation, Woodstock, Connecticut. March 2024.
TRC, 2024b. 2024 Quarterly Progress Report - January to March 2024. TRC Environmental Corporation,
Linemaster Switch Corporation, Woodstock, Connecticut. April 2024.
US ATSDR. 2021. Toxicological Profile for Perfluoroalkyls.
https://www.atsdr.cdc.gov/toxprofiles/tp200.pdf
-------
USEPA. 1988. CERCLA Compliance with Other Laws Manual: Interim Final (Part !) EPA/540/G-
89/006 August 1988.
USEPA, 1993. Superfund Record of Decision. Linemaster Switch Corporation Superfund Site,
Woodstock, Connecticut. July 1993.
USEPA, 2004. Explanation of Significant Differences, Linemaster Switch Superfund Site, Woodstock,
Connecticut. December 2004.
USEPA, 2014a. Third Five-Year Review Report for Linemaster Switch Corporation Superfund Site,
Woodstock, Connecticut. September 2014.
USEPA. 2014b. Human Health Evaluation Manual, Supplemental Guidance: Update of Standard Default
Exposure Factors Memorandum. OSWER Directive 9200.1-120.
USEPA. 2017. Transmittal of Update to the Adult Lead Methodology's Default Baseline Blood Lead
Concentration and Geometric Standard Deviation Parameters Memorandum, May 17, 2017. OLEM
Directive 9285.6-56.
USEPA. 2018. Vapor Intrusion Screening Level (VISL) Calculator. Office of Land and Emergency
Management, Office of Superfund Remediation and Technology Innovation (OSRTT), May 2018.
https://www.epa.gov/vaporintrusion/vapor-intrusionscreening- levels-calculator
USEPA, 2019. Fourth Five-Year Review Report for Linemaster Switch Corporation Superfund Site,
Woodstock, Connecticut. September 2019.
USEPA. 2021a. Provisional Peer-Reviewed Toxicity Values for Perfluorobutane Sulfonic Acid (PFBS)
and Related Compound Potassium Perfluorobutane Sulfonate. Office of Research and Development,
Center for Public Health and Environmental Assessment, EPA/690/R-21 /001F, 2021.
USEPA. 2021b. Recommendations on the Use of Chronic or Subchronic Non-cancer Values for
Superfund Human Health Risk Assessments Memorandum, May 26, 2021. Office of Land and
Emeigency Management, Washington, DC, 2021.
USEPA. 2021c. Human Health Toxicity Values for Hexafluoropropylene Oxide (HFPO) Dimer Acid and
Its Ammonium Salt (CASRN 13252-13-6 and CASRN 62037-80-3) Also Known as "Gen-X Chemicals."
Office of Water, Health and Ecological Criteria Division, Washington, DC, October 2021.
USEPA. 2023. Proposed Plan - Linemaster Switch Corporation Superfund Site, Woodstock, CT.
December 2023.
USEPA, 2024. PFAS National Primary Drinking Water Regulation. Code of Federal Regulations, 40 CFR
Parts 141 and 142. April 2024.
USEPA. Integrated Risk Information System (IRIS). Available at https://www.epa.gov/iiis
USEPA. Provisional Peer-Reviewed Toxicity Values. Available at https://www.epa.gov/portv
USEPA. Regional Screening Level Tables. Available at https://www.epa.gov/iisk/regioiial-screening-
ievels-rsls-generlc-tabies
-------
Woodard & Curran, 2011. Vapor Intrusion Investigation Report. 29 Plaine Hill Road, Woodstock,
Connecticut. June 2011.
P:\4900s\4967.00\Source Files\5-Year Review\Appendix A - References\References.docx
-------
Appendix B
Historical Figures, Tables and Charts
-------
Appendix B.l
Figures
D-l
-------
TRC 2023 Annual
Monitoring Report
Woodstock
CONNECTICUT
IE
SITE LOCATION
2000
Approximate Scale FT
Approximate Scale
MILE
1:24000
BASE CREATED WITH T0P0c>1996 WILDFLOWERS PRODUCTIONS,
www.topo.com 7.5' USGS TOPOGRAPHIC MAPS
PROJECT:
LINEMASTER SWITCH CORPORATION
PLAINS HILL RD„ WOODSTOCK, CI
TITLE:
SITE LOCATION MAP
DRAWN BY: JW
PROJECT NO.: 551782.000010.000041
CHECKED BY: CC
FIGURE 1-1
APPROVED BY: DS
DATE: 03/27/2024
<>TRC
21 Griffin Road North
Windsor, CT 06095
Phone: 880.298.9692
www.trcsolutions.com
FILE NO.
Figure 1-1 Site Location Map Woodstock.ai
-------
-------
-------
TRC 2023 Annual
Monitoring Report
NEMASTER
FACIL
LEGEND
EXISTING UNCONSOLIDATED DEPOSITS
MONITORING WELL
SUSPENDED DVE EXTRACTION WELL
ACTIVE GROUNDWATER
EXTRACTION WELL
Q EXISTING SHALLOW BEDROCK
MONITORING WELL
M FORMER DRY WELL
SOURCE:
- MAP TITLED 'FIGURE 2-1, 2014 ANNUAL
MONITORING REPORT, SITE PLAN, UNEMASTER
SWITCH CORPORATION, WOODSTOCK,
CONNECTICUT", DATED MARCH 2015, SCALE:
r-300* BY WOODARD & CURRAN.
UNEMASTER SMUTCH CORPORATION
29 Plain* HII Road
Woodstock, Connecticut
RECONFIGURED PHASE 1A AREA
SYSTEM EXTRACTION WELLS
Figure 1-4
Figure 1-4_03_07_24.dW9
FW-F20
FW—F27_5
FW-F1
-------
TRC 2023 Annual
Monitoring Report
LEGEND
EXTRACTION WELL
DEEP BEDROCK MONITORING
WELL
WATER SUPPLY WELL
O
375.89 GROUNDWATER ELEVATION
IN WELL IN FEET IN
NOVEMBER 2023 BASED ON
NGVD88 DATUM
400 GROUNDWATER ELEVATION
CONTOUR IN FEET IN
NOVEMBER 2023 BASED ON
NGVD88 DATUM
{DASHED WHERE INFERRED)
N/A NOT APPLICABLE
{NOT MEASURED)
NOTE:
* MW13DB WAS NOT INCLUDED IN
CONTOUR GENERATION AS IT DOES NOT
APPEAR TO BE HYDRAULICALLY
CONNECTED TO OTHER DEEP BEDROCK
WELLS.
UNEMASTER SWITCH CORPORATION
29 PLAJNE HILL ROAD
WOODSTOCK, CONNECTICUT
BEDROCK GROUNDWATER ELEVATION
CONTOURS - NOVEMBER 2023
Figure 3-2
21 Griffin Road North
y TRC jsSsS
Figure 3-2 Nov Z0Z3 Deep I
** MW17DB NOT MEASURED DUE TO AN
OBSTRUCTION IN THE WELL PREVENTING
WATER LEVEL MEASUREMENTS.
WATER LEVELS WERE MEASURED ON
OCTOBER 31,2022 AS PART OF THE
NOVEMBER ANNUAL MONITORING PROGRAM.
SOURCE:
- MAP TITLED "FIGURE 2-1, 2014 ANNUAL
MONITORING REPORT. SITE PLAN.
UNEMASTER SWITCH CORPORATION,
WOODSTOCK, CONNECTICUT*, DATED
MARCH 2015, SCALE: 1"=300' BY
WOODARD & CURRAN.
-------
-------
LEGEND
TRC 2023 Annual
Monitoring Report
451.26
OVERBURDEN MONITORING
WELL
GROUNDWATER
ELEVATION IN WELL IN
FEET IN NOVEMBER 2023
BASED ON NAVD88 DATUM
450 GROUNDWATER ELEVATION
CONTOUR IN FEET IN
NOVEMBER 2023 BASED ON
NAVD88 DATUM
(DASHED WHERE INFERRED)
N/A NOT APPLICABLE
(NOT MEASURED)
1) MWEPAATD AND MW17TD WAS NOT USED
FOR CONTOURING.
2) WATER LEVEL ELEVATION FOR MW26T IS
ADJUSTED TO REFLECT THE REPORTED 63 °
ANGLE OF THE WELL.
3) WATER LEVELS WERE MEASURED ON
OCTOBER 30,2023 AS PART OF THE
NOVEMBER ANNUAL MONITORING
PROGRAM.
4) WATER LEVEL MEASUREMENTS COULD
NOT BE MADE IN MW08T DUE TO AN
OBSTRUCTION IN THE WELL
MAP TITLED "FIGURE 2-1, 2014 ANNUAL
MONITORING REPORT, SITE PLAN,
LIN EM ASTER SWITCH CORPORATION,
WOODSTOCK, CONNECTICUT", DATED
MARCH 2015, SCALE: 1"-300' BY
WOODARD Ac CURRAN.
GRAPHIC SCALE
LMEMASTER SWITCH CORPORATION
28 PLAINE HILL ROAD
WOODSTOCK, CONNECTICUT
OVERBURDEN GROUNDWATER ELEVATION
CONTOURS - NOVEMBER 2023
R- HAKE-TOW
551782-0004-0000
Figure 3-6
<>TRC
-------
TRC 2019 Annual
Monitoring Report
OW75DB
<>NCX<0J)
LINEMASTER SWITCH CORPORATION
29 PLAINE HILL ROAD
WOODSTOCK, CONNECTICUT
DEEP BEDROCK TCE ISOPLETHS
-NOVEMBER 2019
Figure 3-8
<>TRC
2019 TCE CONTOUR.cMig
LEGEND
EXTRACTION WELL
DEEP BEDROCK MONITORING
~ WELL
-0- WATER SUPPLY WELL
580 TCE CONCENTRATION IN
GROUNDWATER IN WELL IN
NOVEMBER 2019 (ng/l)
— 100 TCE CONCENTRATION
ISOPLETH IN
NOVEMBER 2019 (ng/l)
(DASHED WHERE INFERRED)
ND(0.5) TCE NOT DETECTED AT
INDICATED REPORTING LIMIT
(Hg/I)
NS NOT SAMPLED
SOURCE:
- MAP TITLED "FIGURE 2-1, 2014 ANNUAL
MONITORING REPORT, SITE PLAN,
UN EM ASTER SWITCH CORPORATION,
WOODSTOCK, CONNECTICUT", DATED
MARCH 2015, SCALE: 1"=300* BY
WOODARD & CURRAN.
-------
-------
Ij
li
-------
TRC 2022 Annual
Monitoring Report
CW7BDB
<>HD(
-------
ND(<0,5)
TCE CONCENTRATION IN
GROUNDWATER IN WELL IN
NOVEMBER 2023
(Micrograms per liter or ng/l)
TCE CONCENTRATION
ISOPLETH IN
NOVEMBER 2023 (ng/l)
{DASHED WHERE INFERRED)
TCE NOT DETECTED AT
INDICATED REPORTING UMIT
(w/l)
NOT SAMPLED
MAP TITLED "FIGURE 2-1, 2014 ANNUAL
MONITORING REPORT, SITE PLAN,
UNEMASTER SWITCH CORPORATION,
WOODSTOCK. CONNECTICUT", DATED
MARCH 2015. SCALE: 1"-300' BY
WOODARD & CURRAN.
GRAPHIC SCALE
UNEMASTER SWITCH CORPORATION
ANNUAL DEEP BEDROCK TCE ISOPLETHS
551762.0004,0000
D. 8TALLIHG8
«>TRC
-------
LEGEND
"INSET A"
EXTRACTION WELL
SHALLOW BEDROCK
MONITORING WELL
241 TCE CONCENTRATION IN
GROUNDWATER IN WELL IN
NOVEMBER 2019 (^g/l)
— 100 TCE CONCENTRATION ISOPLETH
IN NOVEMBER 2019 (ng/l)
(DASHED WHERE INFERRED)
ND(<0.5) TCE NOT DETECTED AT INDICATED
REPORTING LIMIT (ng/l)
MAP TITLED "FIGURE 2-1, 2014 ANNUAL
MONITORING REPORT. SITE PLAN,
LINEMASTER SWITCH CORPORATION,
WOODSTOCK, CONNECTICUT", DATED
MARCH 2015, SCALE: 1"=300' BY
WOODARD & CURRAN.
LINEMASTER SWITCH CORPORATION
29 PLAINE HILL ROAD
WOODSTOCK, CONNECTICUT
ANNUAL SHALLOW BEDROCK TCE
ISOPLETHS - NOVEMBER 2019
Figure 3-10
<>TiRC
2019 TCE CONTOUR.cMig
-------
LEGEND
"INSET A"
EXTRACTION WELL
SHALLOW BEDROCK
MONITORING WELL
14.8 TCE CONCENTRATION IN
GROUNDWATER IN WELL IN
NOVEMBER 2020 (^g/l)
— 100 TCE CONCENTRATION ISOPLETH
IN NOVEMBER 2020 (ng/l)
(DASHED WHERE INFERRED)
ND(<0.5) TCE NOT DETECTED AT INDICATED
REPORTING LIMIT (ng/l)
MAP TITLED "FIGURE 2-1, 2014 ANNUAL
MONITORING REPORT. SITE PLAN,
LINEMASTER SWITCH CORPORATION,
WOODSTOCK, CONNECTICUT", DATED
MARCH 2015, SCALE: 1"=300' BY
WOODARD & CURRAN.
LINEMASTER SWITCH CORPORATION
29 PLAINE HILL ROAD
WOODSTOCK, CONNECTICUT
ANNUAL SHALLOW BEDROCK TCE
ISOPLETHS - NOVEMBER 2020
Figure 3-10
<>TiRC
Flgu» 3-10 NOV 2020 Shallow Bofrot* TCE iBopHtrtMig
-------
LEGEND
"INSET A"
EXTRACTION WELL
SHALLOW BEDROCK
MONITORING WELL
TCE CONCENTRATION IN
GROUNDWATER IN WELL IN
NOVEMBER 2021 (ng/l)
- TCE CONCENTRATION ISOPLETH
IN NOVEMBER 2021 (ng/l)
(DASHED WHERE INFERRED)
ND(<0.5) TCE NOT DETECTED AT INDICATED
REPORTING LIMIT (ng/l)
MAP TITLED "FIGURE 2-1, 2014 ANNUAL
MONITORING REPORT. SITE PLAN,
LINEMASTER SWITCH CORPORATION,
WOODSTOCK, CONNECTICUT", DATED
MARCH 2015, SCALE: 1"=300' BY
WOODARD & CURRAN.
LINEMASTER SWITCH CORPORATION
29 PLAINE HILL ROAD
WOODSTOCK, CONNECTICUT
ANNUAL SHALLOW BEDROCK TCE
ISOPLETHS - NOVEMBER 2021
Figure 3-10
<>TiRC
Flgu» 3-10 NOV 2021 Shallow Bofrot* TCE iBopHtrtMig
-------
LEGEND
"INSET A"
EXTRACTION WELL
A). SHALLOW BEDROCK
^ MONITORING WELL
7.02 TCE CONCENTRATION IN
GROUNDWATER IN WELL IN
NOVEMBER 2022 (ng/l)
100 TCE CONCENTRATION ISOPLETH
IN NOVEMBER 2022 (|Xg/l)
(DASHED WHERE INFERRED)
ND(<0.5) TCE NOT DETECTED AT INDICATED
REPORTING LIMIT (ng/l)
NS NOT SAMPLED
SOURCE:
- MAP TITLED "FIGURE 2-1, 2014 ANNUAL
MONITORING REPORT, SITE PLAN,
LINEMASTER SWITCH CORPORATION,
WOODSTOCK, CONNECTICUT", DATED
MARCH 2015, SCALE: 1"=300* BY
WOODARD & CURRAN.
UNEMASTER SWITCH CORPORATION
29 PLAJNE HILL ROAD
WOODSTOCK, CONNECTICUT
TITLE:
ANNUAL SHALLOW BEDROCK TCE
ISOPLETHS - NOVEMBER 2022
Figure 3-10
21 Griffin Road North
y TRC jsSsS
FILE HO.: Figure 3-10 Hoy2022 SH allow Bad rock TCE Homam.dWH
IKC 2022 Annual
Monitoring Report
-------
LEGEND
"INSET A"
EXTRACTION WELL
SHALLOW BEDROCK
MONITORING WELL
TCE CONCENTRATION IN
GROUNDWATER IN WELL IN
NOVEMBER 2023
(Micrograms per liter or ng/l)
TCE CONCENTRATION ISOPLETH
IN NOVEMBER 2023 (ng/l)
(DASHED WHERE INFERRED)
ND(<0.5) TCE NOT DETECTED AT INDICATED
REPORTING LIMIT (Mg/I)
NS NOT SAMPLED
SOURCE:
- MAP TITLED "FIGURE 2-1, 2014 ANNUAL
MONITORING REPORT, SITE PLAN,
LINEMASTER SWITCH CORPORATION,
WOODSTOCK, CONNECTICUT", DATED
MARCH 2015, SCALE: 1"=300* BY
WOODARD & CURRAN.
UNEMASTER SWITCH CORPORATION
29 PLAJNE HILL ROAD
WOODSTOCK, CONNECTICUT
TITLE:
ANNUAL SHALLOW BEDROCK TCE
ISOPLETHS - NOVEMBER 2023
Figure 3-10
21 Griffin Road North
y TRC jsSsS
FILE HO.: Figure 3-10 Hoy2023 Shallow Bedrock TCE IscplBUi.dwu
IKC 2023 Annual
Monitoring Report
-------
LEGEND
"INSET A"
ND(<0.5)
OVERBURDEN MONITORING
WELL
TCE CONCENTRATION IN
GROUNDWATER IN WELL IN
NOVEMBER 2019 (ng/l)
- TCE CONCENTRATION ISOPLETX
IN NOVEMBER 2019 (ng/l)
(DASHED WHERE INFERRED)
TCE NOT DETECTED AT
INDICATED REPORTING UMIT
(MS/I)
NOT SAMPLED
- MAP TITLED "FIGURE 2-1, 2014 ANNUAL
MONITORING REPORT, SITE PLAN,
UNEMASTER SWITCH CORPORATION,
WOODSTOCK, CONNECTICUT", DATED
MARCH 2015, SCALE: 1"=300' BY
WOODARD & CURRAN.
ECT:
LINEMASTER SWITCH CORPORATION
29 PLAINE HILL ROAD
WOODSTOCK, CONNECTICUT
Figure 3-12
<>TiRC
2019 TCE CONTOUR.cMig
-------
LEGEND
"INSET A"
ND(<0.5)
OVERBURDEN MONITORING
WELL
TCE CONCENTRATION IN
GROUNDWATER IN WELL IN
NOVEMBER 2020 (ng/l)
- TCE CONCENTRATION ISOPLETX
IN NOVEMBER 2020 (ng/l)
(DASHED WHERE INFERRED)
TCE NOT DETECTED AT
INDICATED REPORTING UMIT
(MS/I)
NOT SAMPLED
- MAP TITLED "FIGURE 2-1, 2014 ANNUAL
MONITORING REPORT, SITE PLAN,
UNEMASTER SWITCH CORPORATION,
WOODSTOCK, CONNECTICUT", DATED
MARCH 2015, SCALE: 1"=300' BY
WOODARD & CURRAN.
ECT:
LINEMASTER SWITCH CORPORATION
29 PLAINE HILL ROAD
WOODSTOCK, CONNECTICUT
Figure 3-12
<>TiRC
-------
LEGEND
"INSET A"
ND(<0.5)
OVERBURDEN MONITORING
WELL
TCE CONCENTRATION IN
GROUNDWATER IN WELL IN
NOVEMBER 2021 (ng/l)
- TCE CONCENTRATION ISOPLETX
IN NOVEMBER 2021 (ng/l)
(DASHED WHERE INFERRED)
TCE NOT DETECTED AT
INDICATED REPORTING UMIT
(MS/I)
NOT SAMPLED
- MAP TITLED "FIGURE 2-1, 2014 ANNUAL
MONITORING REPORT, SITE PLAN,
UNEMASTER SWITCH CORPORATION,
WOODSTOCK, CONNECTICUT", DATED
MARCH 2015, SCALE: 1"=300' BY
WOODARD & CURRAN.
ECT:
LINEMASTER SWITCH CORPORATION
29 PLAINE HILL ROAD
WOODSTOCK, CONNECTICUT
Figure 3-12
<>TiRC
-------
LEGEND
"INSET A"
OVERBURDEN MONITORING
WELL
TCE CONCENTRATION IN
GROUNDWATER IN WELL IN
NOVEMBER 2022 (^g/l)
¦ TCE CONCENTRATION ISOPLETH
IN NOVEMBER 2022 (ng/l)
{DASHED WHERE INFERRED)
ND(<0 5) TCE NOT DETECTED AT
INDICATED REPORTING LIMIT
(Hg/I)
NS NOT SAMPLED
SOURCE:
- MAP TITLED "FIGURE 2-1. 2014 ANNUAL
MONITORING REPORT, SITE PLAN.
UNEMASTER SWITCH CORPORATION,
WOODSTOCK, CONNECTICUT", DATED
MARCH 2015, SCALE: 1"=300' BY
WOODARD & CURRAN.
UNEMASTER SWITCH CORPORATION
29 PLAJNE HILL ROAD
WOODSTOCK, CONNECTICUT
Figure 3-12
21 Griffin Road North
y TRC jsSsS
FILE HO.: FlgirB 3-12 NCV2022 OvBrtxirdan TCE IscplBUi.dwu
-------
-------
SOURCE:
- MAP TITLED "FIGURE 2-1,
2014 ANNUAL MONITORING
REPORT, SITE PLAN,
LINEM ASTER SWITCH
CORPORATION. WOODSTOCK,
CONNECTICUT", DATED MARCH
2015, SCALE; 1"=300' BY
WOODARD it CURRAN.
LEGEND
*
-o
|TRC 2019 Annual
I Monitoring Report
EXISTING UNCONjuuumilu uu ujiij
MONITORING WELL
EXTRACTION WELL
SHALLOW BEDROCK MONITORING WELL
DEEP BEDROCK MONITORING WELL
1) MAXIMUM ANNUAL CONCENTRATION IS
SHOWN.
2) ONLY RESULTS FOR WELLS WHERE 8260
SIM OR 8270 SIM ANALYSES WERE
PERFORMED ARE SHOWN.
3) RESULTS FOR SOURCE AREA WELLS
FW-F35, FW-I, MW10SB, 0W-01SB,
0W-04SB, & DW-01SB ARE NOT SHOWN.
4) CONNECTICUT DEPARTMENT OF HEALTH
(CTDPH) ACTION LEVEL IS 3 ppb.
-0- SURFACE WATER SAMPUNG POINT
-0- WATER SUPPLY WELL
4.3 = 1,4—DIOXANE CONCENTRATION IN
PARTS PER BILLION (ppb)
GREEN = NOT DETECTED (ND)
BLUE = DETECTED BUT DOES NOT
EXCEED CTDPH ACTION LEVEL
YELLOW = DETECTED AND EXCEEDS CTDPH
ACTION LEVEL
NS = NOT SAMPLED
NA = NOT ANALYZED FOR 1,4-DIOXANE
BY USEPA METHOD B270SIM
LIN EH ASTER SWITCH CORPORATION
29 PLAINE HILL ROAD
WOODSTOCK, CONNECTICUT
SUMMARY OF 2016-2019 1,4 DIOXANE RESULTS
Figure 4-1
<>TRC
2019 <3W CONTOUR.flwg
-------
-------
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-------
OSWER No. 9355.7-03B-P
Appendix B.2
Tables
D-l
-------
TRC Focused Feasibility Study
Report, Revised October 2023
TABLE 2-6
SUMMARY OF GROUNDWATER COCS, ASSOCIATED CHEMICAL-SPECIFIC ARARs/TBCS, RISK-BASED LEVELS, QUANTITATION LIMITS, AND SELECTED PRGS
Line master Switch Corporation Site
Woodstock, Connecticut
CONTAMINANT OF CONCERN
2018 LTMP
Drinking Water Criteria
RSRs
USEPA RSLs
QL
(na/Q
Selecte
d PRG
(p«/L)
Basis
Minimum
Detected
Concentration
(wjA)
Maximum
Detected
Concentration
(wjA)
Impacted
Aquifer
Zone
Federal
MCL
(wjA)
State MCL
(wjA)
Promulgated
Tapwater
(HO/L)
GWPC
(pg/L)
SWPC
(p«/L)
Arsenic
Not Analyzed
in 2018
Not Analyzed
in 2018
TBD
10
10
50
4
0.052
188
Site-Specific
Background
Carbon tetrachloride
1.61
2.9
T
5
5
5
132
5
Fed/State MCL;
RSRs-GWPC
1,2-Dich loroethane
1.04
2.48
T
5
5
1
2,970
1
RSRs-GWPC
1,1-Dich loroet hen e
0.172
129
T,SB,DB
7
7
7
96
7
RSRs-GWPC
cis-l,2-Dichloroethene
0.201
62,800
T,SB,DB
70
70
70
70
Fed/State MCL;
RSRs-GWPC
tra ns-1,2- Dich loroet hene
0.2
1,020
T,SB,DB
100
100
100
100
Fed/State MCL;
RSRs-GWPC
1,2- Dich loropropane
0.335
10.6
T
5
5
5
5
Fed/State MCL;
RSRs-GWPC
1,4-Dioxane
0.135
166
T,SB
0.46
0.15
a 46
USEPA RSL
Ethylbenzene
70.2
206
SB
700
700
700
580,000
700
Fed/State MCL;
RSRs-GWPC
Tetrachloroethene
0.702
1,240
T
5
5
5
88
5
Fed/State MCL;
RSRs-GWPC
Toluene
103
9,810
T,SB
1,000
1,000
1,000
4,000,000
1,000
Fed/State MCL;
RSRs-GWPC
1,1,2-Trich 1 oroetha ne
ND
ND
T
5
5
5
1,260
5
Fed/State MCL;
RSRs-GWPC
Trichloroethene
0.191
598,000
T,SB,DB
5
5
5
2,340
5
Fed/State MCL;
RSRs - GWPC
Vinyl chloride
0.073
3,520
T,SB,DB
2
2
2
15,750
2
Fed/State MCU
RSRs-GWPC
Xylenes
77.2
2,760
SB
10,000
10,000
530
530
RSRs-GWPC
Italics Italic typeface indicates TBCs (i.e., criteria, advisories or guidance levels that are not promulgated and QLs), which are provided only for COCs without ARARs. Italic typeface is also used to
identify selected PRGs that are based on TBCs.
The following conventions are used for the presentation of maximum concentrations. Bold typeface is also used to identify selected PRGs that are exceeded by the maximum
detected concentrations.
Bold Bold typeface and blue-shaded cell indicates concentration exceeds at least one ARAR. T=Till
Bold Bold italic typeface with no shading indicates concentration exceeds at least one TBC. SB=Shallow Bedrock
LTMP = Long Term Monitoring Program DB=Deep Bedrock
PRG = Preliminary Remediation Goal
TBD: To be determined; while arsenic background level exceedances were detected in limited source area groundwater sampling conducted in 2017, additional arsenic sampling is underway to
determine current arsenic levels in groundwater and re-evaluate the background level originally developed during the Rl; PFOA and PFOS sampling is also underway to determine current levels in
groundwater.
- = standard not established
2018 minimum concentrations reflect the minimum detected concentration; listed com pounds were not detected in many samples.
2018 LTMP data from Table 3-4E and 3-4H (with the exception of MW10SB) of 2018 Annual Monitoring Report (TRC, 2019).
The 2018 LTMP analyses included m,p-xylenes and o-xylenes; the total of these is listed here.
Selected PRGs are based on the most conservative promulgated standard (ARAR).
Criteria:
MCL = Maximum Contaminant Level (USEPA, 2023 for federal MCLs; RCSA 19-13-B102 for Connecticut MCLs) (ARARs)
RSRs = Connecticut Remediation Standard Regulations (RSRs); promulgated standards at RCSA 22a-133k. (ARARs); as amended February 16, 2021.
GWPC = Groundwater Protection Criteria
SWPC = Surface Water Protection Criteria
USEPA RSL = Regional Screening Level (USEPA RSL Summary Table, May 2023, target cancer risk= 1.0; target hazard quotient = 1.0) (risk-based TBCs). Values reflect tapwater exposures.
QL = Quantitation Limit; values provided by Alpha Analytical 09/17/2020; 1,4-dioxane QL based on method 8270D SIM
While background wells were sampled for VOC analysis during the Rl, 1,4-dioxane was not included as an analyte; therefore background concentrations were not
considered as candidate PRGs.
-------
TRC Focused Feasibility Study
Report, Revised October 2023
TABLE 2-7
SUMMARY OF SOURCE AREA OVERBURDEN SOIL COCs, ASSOCIATED CHEMICAL-SPECIFIC ARARS/TBCS, AND SELECTED PRGS
Linemaster Switch Corporation Site
Woodstock, Connecticut
1992 Rl DATA SUMMARY
2017 SOURCE AREA INVESTIGATION
RSRs
Average
Minimum
Maximum
Minimum
Maximum
GA-PMC (ng/kg)
Detected
Detected
Detected
Detected
Detected
Selected
Concentration
Concentration
Concentration
Concentration
Concentration
PRG
CONTAMINANT OF CONCERN
(ng/kg)
(ng/kg)
(MS/kg)
(MS/kg)
(MS/kg)
Promulgated
(Hg/kg)
1,2-Dichloroethane
66.0
23
92
ND
ND
20
20
cis-l,2-Dichloroethene
134.7
2.6
1,800
0.59
6,150
1,400
1,400
Tetrachloroethene
150.5
4.6
984
2.5
2,680
100
100
Toluene
1,041.0
5.2
16,000
2.9
16,900
20,000
20,000
Trichloroethene
6,072.5
3.2
210,000
0.55
643,000
100
100
Xylenes
1,764.7
3.3
52,000
50.51
8,070'
19,500
19,500
Bold Bold typeface and blue-shaded cell indicates concentration exceeds an ARAR. Bold typeface is also used to identify selected PRGs that are exceeded by the
maximum detected concentrations.
ND = not detected
PRG = Preliminary Remediation Goal
Notes:
Rl = Remedial Investigation
Zone 11992 Rl data summary from Table 10-1 of FS Report (Fuss & O'Neill, 1992); unreported compounds assumed to be undetected.
2017 Source Area Investigation data from Table 3-2 of 2017 Site Investigation Report (TRC, 2018a).
Criteria:
RSRs/GA PMC = Connecticut Remediation Standard Regulations (RSRs), Groundwater Class GA Pollutant Mobility Criteria (PMC) applicable to soils;
promulgated standards at RCSA 22a-133k (ARARs), as amended February 16, 2021.
Footnotes:
1. Xylene data from 2017 Source Area Investigation based on combined concentrations of m,p-xylenes and o-xylenes.
-------
Table 1-1
2023 Monitoring Program
2023 Annual Monitoring Report
Llnemaster Switch Corporation
TRC 2023 Annual
Monitoring Report
Location
Sam0e Pofeit Grouphg
Analysed
¦Hud"
And' : Schedule
MontHy Quarterly Sanl-Amually Amualy
Monthly Quaitaiy Semi-Annudly(,) Annuity**
Reconfigured Phase IA Sy*tan - Extraction Hfel*
FW-F36
Rectnfigured Phase 1A System - Extractor Wels
826CD/8270SMB
X
X
COCs
COCs S 1,4-Dioxane6
MW10SE
Reconfigured Phase 1A System - Exiactiar Wels
826cd/827osmp1,
6020B, 537M
X
(3fdqfroriy)
X
X
SelsctPFAS
(3njqtreriy)
COCs, Select PFAS
COCs,1,40ioxane8, As, Sdect PFAS
FW-E
Rectnfigured Phase 1A System - Extraclor Wdls
826CD/8270SMP1,
537M
X
(3fdqfroriy)
X
X
SelsctPFAS
(3njqtreriy)
COCs, Select PFAS
COCs,1,4-Dioxane6, Select PFAS
FW-H
Rectnfigured Phase 1A System - Extraclor Wdls
826CD/827OS
X
X
COCs
COCs S 1,4-Dioxane8
FW-I
Rectnfigured Phase 1A System - Extractor! Wdls
826CD/8270SMP1,
537M
X
(3rd qfr oriy)
X
X
SelsctPFAS
(3rd qtr onlyj
COCs, Select PFAS
COCs,1,4-Dioxane6, SelectPFAS
FW-J
Rectnfigured Phase 1A System - Extraclor Wdls
8260D/8270SM(2)
X
X
COCs
RTSNF
RTS-System
624.1/8270SMP1
X
X
X
X
Ful list
Full List
Full List& 1,4-Dioxane
Ful ListS 1,4-Dioxane
RTSEFF
RTS-System
624.1/8270SMP1
X
X
X
X
Ful list
Full List
Full List& 1,4-Dioxane
Ful ListS 1,4-Dioxane
RTSfinal Discharge
RTS-System
624.1«270SMP1
X
X
X
X
Ful list
Full List
Full ListS 1,4-Dioxane
Ful ListS 1,4-Dioxane
GW1Q06
Deep Bedrock Extractor Wdls
826CD/8270SMB
X
X
X
COCs
COCs
COCs S 1,4-Dioxane6
MW31D6
Deep Bedrock Extraclor Wdls
826CD/8270SMb
X
X
X
COCs
COCs
COCs S 1,4-Dioxane6
MW3606
Deep Bedrock Extractor Wdls
826CD/8270SMB
X
X
X
COCs
COCs
COCs S 1,4-Dioxane6
MW14D6
Deep Bedrock Extractor Wdls
826CD/8270SMP1,
6020B, 537M
X
X
X
COCs, As,
SdectPFAS
(PFAS 3rd Qfr
COCs S1,4-Dit*wie, As, Sdect PFAS
COCs S 1,4-Dioxane, As, SelectPFAS
MW1506
Deep Bedrock Extractor Wdls
8260D«270SMP1
X
X
X
COCs
COCsS 1,4-Dioxane
COCs S1,4-Dit*wie
MW17D6
Deep Bedrock Extractor Wdls
826CD/8270SMB
X
X
X
COCs
COCs
COCs S 1,4-Dioxane6
X
1
I
1
1
1
ell*
GW12D6*
Deep Bedrock Moritoriig Wels
826CD/827OSM^
X
X
COCs
COCs S 1,4-Dioxane6
GW3606®
Deep Bedrock Moritoriig Wels
826CD
X
COCs
MTO8D6
Deep Bedrock Moritoriig Wels
826CD/827OSM^1
X
COCs S 1,4-Dioxane6
MW11D6
Deep Bedrock Moritoriig Wels
82600,60206
X
X
X
As
COCs, As
COCs, As
MW12D6
Deep Bedrock Moritoriig Wels
826CD,6020B
X
X
X
As
COCs, As
COCs,As
MW18D6
Deep Bedrock Moritoriig Wels
8260D
X
X
COCs
MW21DB
Deep Bedrock Moritoriig Wels
826CD/827OSM^1
X
X
COCs
COCs S 1,4-Dioxane6
MW22D6
Deep Bedrock Moritoriig Wels
8260D
X
X
COCs
COCs
MW27D6
Deep Bedrock Moritoriig Wels
8260D, 60206
X
X
COCs
COCs. As
MW28D6
Deep Bedrock Moritoriig Wels
8260O/827DSIM
X
X
X
COCs
COCs S 1,4-Dioxane
COCs S 1,4-Dit*aie
MW2906
Deep Bedrock Moritoriig Wels
82600,60206
X
X
COCs
COCs, As
MW3506
Deep Bedrock Moritoriig Wels
826CD/8270SMP1,
6020B
X
X
COCs S 1,4-Dioxane
COCs S1,4-Dioxane, As
DW-01S8
Stidlow Bedrock Morittring Wdls
82600
X
COCs
MTO1SB
Stidlow Bedrock Morittring Wdls
82600
X
COCs
MWJ5S8
Stidlow Bedrock Morittring Wdls
82600,60206
X
As
As
COCs, As
MW36S8
Stidlow Bedrock Morittring Wdls
826CD/8270SMB
X
COCs S 1,4-Dioxane6
MW38S8
Stidlow Bedrock Morittring Wdls
82600ffl270SIM«
X
COCs S 1,4-Dit*aie
MW11S6
Stidlow Bedrock Morittring Wdls
82600
X
COCs
MW12SB
Stidlow Bedrock Morittring Wdls
82600,60206
X
As
As
COCs. As
MW14SE
Stialow Bedrock Moritoriig Wels
82600827051^
X
COCs S 1,4-Ditxsie
MW15SB
Stidlow Bedrock Morittring Wdls
826CO/B270SIM1"''
X
COCs S 1,4-Dit*aie
MW17S8
Stidlow Bedrock Morittring Wdls
82600/8270^
X
X
COCs S 1,4-Dioxane
COCs S 1,4-Dit*aie
MW18SB
Stidlow Bedrock Morittring Wdls
82600,60206
X
X
As
As
COCs, As
MW27S8
Stialow Bedrock Monttring Wels
82600,60206
X
X
COCs
COCs, As
MW28S6
Stidlow Bedrock Morittring Wdls
82600
X
COCs
MW29S6
Stidlow Bedrock Morittring Wdls
82600,60206
X
COCs, As
MWEPAASB
Stidlow Bedrock Morittring Wdls
82600ffl270SIM«
X
COCs S 1,4-Dit*aie
0W-01S8
Stidlow Bedrock Morittring Wdls
82600
X
COCs
OW-MSB
Stidlow Bedrock Morittring Wdls
82600
X
COCs
<>TRC
Table 1-1
2023 Monitoring Program
-------
Table 1-1
2023 Monitoring Program
2023 Annual Monitoring Report
Llnemaster Switch Corporation
TRC 2023 Annual
Monitoring Report
And' : Schedule
Location
Sam0e Pofeit Grouphg
Analysed
MontHy Quarterly Sanl-Aiwiually Amualy
Monthly Quartoly Semi-Annualy1,) Annuity**
Owturden MonKortia HW
MW31T
Overburden Mtnitoring Wells
82600
X
COCs
MW32T
Overburden Mtnitoring Wells
8260tt8Z70SM(2)
X
COCs & 1,4-DioJtane6
MW33T
Overburden Mtnitoring Wells
826CD,6020B
X
X
X
As
As
COCs. As
MW34T
Ovaburdai Marittiing Wels
82K»8270SM(2),
6020B
X
X
COCs
COCs & 1,4-Ditaane, As
MTO6T
Overburden Mtnitoring Wells
82600
X
X
COCs
COCs
MW11T
Overburden Mtnitoring Wells
82600
X
X
COCs
COCs
MW12T
Ovwburdm Marittiing Wdls
826CD,6020B
X
X
As
As
COCs, As
MW15T
Overburden Mtnitoring Wells
82600
X
COCs
MW17TD
Overburden Mtnitoring Wdls
82600827081^
X
X
COCs & 1,4-Dioxane
COCs & 1,4-Ditjtaie
MW17T5
Overburden Mtnitoring Wells
8260D
X
X
COCs
COCs
MW18T
Overburden Mtnitoring Wells
8260D
X
X
COCs
MW23T
Overburden Mtnitoring Wells
8260D
X
X
COCs
COCs
MW24T
Overburden Mtnitoring Wells
8260D
X
COCs
MW25T
Overburden Mtnitoring Wells
8260D
X
COCs
MW26T
OvBburdai Marittiing Wels
azHorazTosM",
6020B.S37M
X (3rd qfrtnly)
X
X
SelsctPFAS
(3rd qtr onlyj
COCs, PFAS
COCs, 1,40ioxane. As, Select PFAS
MW27T
Overburden Mtnitaring Wells
82600,80206
X
COCs. As
MW28T
Overburden Mtnitaring Wells
8260D®70SMb
X
COCs & 1,4-Dioxane8
MW29T
Overburden Mtnitoring Wells
82600
X
COCs
MW30TD
Overburden Mtnitaring Wdls
8260Dra27tlSMB
X
COCs & 1,4-DioJtane6
MW30T5
Overburden Mtnitaring Wells
82600
X
COCs
MW31T
Overburden Mtnitaring Wdls
82600
X
COCs
MW32T
Overburden Mtnitoring Wdls
82600
X
COCs
MW33T
Oraburdm Marittiing Wdls
82600SI270SM'1'
X
X
COCs & 1,4-Dioxane
COCs & 1,4-Ditjtaie
MW34T
Overburden Mtnitoring Wells
82600
X
COCs
MWEPAATD
Overburden Mtnitoring Wdls
82600827081^
X
X
COCs & 1,4-Dioxane
COCs & 1,4-Ditjtaie
MWEPAATS
Overburden Mtnitoring Wells
8260D®70SMb
X
X
COCs
COCs & 1,4-DioJtane6
Dotnwi
*
GWM
Dtmeslc Water Suffily Wells
5242
X
COCs
Gwceoe®
Dtmeslc Water Su^ily Wfells
5242
X
COCs
GW08D64
Domeslc Watr SuRily Wells
82600827081^
X
X
X
COCs &
1,4-Diowne
COCs & 1,4-Dioxane
COCs & 1,4-Dit*wie
GW38TA
Domeslc Water Suwlv Wells TS
5242
X
X
X
COCs
COCs
COCs
GW38TB
5242
X
X
X
COCs
COCs
COCs
GTO8TC
Dtmeslc Water Su^ty Wills TS
5242827081#
X
X
X
COCs &
1,4-DioJtane
COCs & 1,4-Dioxane
COCs & 1,4-Dioxane7
GWM
Dtmeslc Water Su^ily Wells
5242/8270S1#,
2005
X
X
X
COCs
COCs7
COCs & 1,4-Dit*wie7, As
GW14E
Dtmeslc Water Suwlv Wells TS
5242
X
X
X
COCs
COCs
COCs
GW14T
Dtmeslc Water Suwlv Wells TS
521.2 2008
X
X
X
COCs
COCs
COCs, As
GW1606
5242
X
COCs
GW17D6
Dtmeslc Water SukJv Wells
5242
X
COCs
<>TRC
Table 1-1
2023 Monitoring Program
-------
Table 1-1
2023 Monitoring Program
2023 Annual Monitoring Report
Llnemaster Switch Corporation
TRC 2023 Annual
Monitoring Report
And' : Schedule
Location
Sam0e Pofeit Grouphg
Analytic^
¦Hud"
MontHy Quarterly Sanl-Amually Amualy
Monthly Quartaiy Semi-Annudly(,) Annuity**
Dcmeatle Water Sum* We
* (contbiuedl
GW24D6
Donaslc Water SukJv Walls
5242
X
COCs
GW250B
ttxnaslc Water SukJv Walls
5242
X
COCs
GW34D6®
Dunaslc Water SURily Mill
5242
X
COCs
GW43065
Dunaslc Water SURily Wfells
5242
X
X
X
COCs
COCs
COCs
GW40B
Donaslc Water Suwlv Walls TS
5242
X
X
X
COCs
COCs
COCs
GW40T
Danaslc Water Suwlv Walls TS
5242
X
X
X
COCs
COCs
COCs
GW6806
Donaslc Water Su»ly Walls
5242
X
COCs
GW73DB
Donas! c Water Su»ly Walls
5242
X
X
X
COCs
COCs
COCs
GW74DB
5242
X
X
X
COCs
COCs
COCs
GW750B
Dunes! c Water SukJv Walls
5242
X
X
X
COCs
COCs
COCs
GW76065
Donasic Water SURily Walls
5242ffl270SMp)
X
X
X
COCs
COCs
COCs & 1.40o*ane7
GW76B
Doneslc Water Su»lv Wells TS
5242
X
X
X
COCs
COCs
COCs
Surface Water
STO4
Surface Water
5242ffl270SMp)
X
COCs & 1,4-DaTRC
Table 1-1
2023 Monitoring Program
-------
Table 4-1
Recommended 2024 Monitoring Program
2023 Annual Monitoring Report
Llnemaster Switch Corporation
TRC 2023 Annual
Monitoring Report
Location
Sample Point Groupkig
Analytic*
Method1*1
Frequoicv^^^
Analytical Schedrie
Monthly Quotoriy
SemLAnnudly Amusly
Monthly Quarterly 8anl-A™iudly(*1 Annuity**
Reconfigured Phase IA Sy*tan - Extraction Wels
FWF35
Reconigijed Phase 1A System - Extactim Wells
8260D*
X
X
COCs
COCs8
MW1C6B
Reconfigured Phase 1A System - Exfractian Wels
X
X
X
SdsetPFAS
COCs, Select PFAS
COCs6, As, Select PFAS
FW€
Reconigured Phase lASystwn - Extracfon Wells
8260DI,S37M
X
X
X
SdsetFFAS
COCs, Select PFAS
COCs8, As, Select PFAS
FW+I
Reconigured Phase lASystan - Extractor Wells
8260D1
X
X
COCs
COCs8
FW-I
Reconigijed Phase 1A System - Extactim Wells
8260D',S37M
X
X
X
SdsetPFAS
COCs, Select PFAS
COCs8, As, Select PFAS
FWJ
Reconigured Phase lASystwn - Extracton Wells
8260D*
X
X
COCs
COCs8
FTS Sy«tem
IRTSINF
IRTS - Systan
624.1(8270S M'
X
X
X
X
Full List
Fiji List
Fiji List & 1,4-Dioxane
Full List & 1,40ioxane
IRTSEFF
IRTS - System
624.1(8270S M'
X
X
X
X
Full List
Fiji List
Fiji List & 1,4-Dioxane
Full List & 1,40ioxane
IRTSFinal Discharge
IRTS-System
624.1/8270S M'
X
X
X
X
Full List
Fiji List
Fiji List & 1,4-Dioxane
Full List & 1,40ioxane
Deep Bedrock Extraction W
GW10DB
Deep Bedrock Exfractim Wells
8260D*
X
X
X
COCs
COCs
COCs8
MW01DB
Deep Bedrock Exfractim Wells
8260D1
X
X
X
COCs
COCs
COCs8
mwo®b
Deep Bedrock Exfractim Wells
8260D*
X
X
X
COCs
COCs
COCs8
MW1®6
Deep Bedrock Exfractim Wells
82600f8270SM',
6O20B.S37M
X
X
X
COCs, As,
Select PFAS
COCs & 1,4-Dir*me, As, Sdect
PFAS
COCs & 1,4-Diwme, As, Select PFAS
MW13DB
Deep Bedrock Extractim Wells
8260O8270SMP1
X
X
X
COCs
COCs & 1,4-Dioxane
COCs & 1,4-Dioxane
MW17DB
Deep Bedrock Extractim Wells
8260D1
X
X
X
COCs
COCs
COCs8
Deep Bedrock MoritortigW
Ml*
GW12DB®
Deep Bedrock Mmitoring Wells
8260D1
X
X
COCs
COCs8
Gwaaie®
Deep Bedrock Mmitoring Wells
8260D*
X
COCs
MW08DB
Deep Bedrock Morittxing Wdls
8260D1
X
COCs8
MW11DB
Deep Bedrock Mmitoring Wells
82600/6020B*
X
X
X
As
COCs, As
COCs,As
MW1ZDB
Deep Bedrock Itaiitoring Wells
8260D/6020B2
X
X
X
As
COCs, As
COCs, As
MW1®B
Deep Bedrock Itaiitoring Wells
8260D*
X
X
COCs
MW21DB
Deep Bedrock Morittxing Wdls
8260D1
X
X
COCs
COCs8
MW2ZDB
Deep Bedrock Mmitoring Wells
8260D*
X
X
COCs
COCs
MW27DB
Deep Bedrock Itaiitoring Wells
8260D/6020B2
X
X
COCs
COCs.As
MW28DB
Deep Bedrock Itaiitoring Wells
82SDS270SIM*
X
X
COCs
COCs & 1,4-Dioxane
COCs & 1,4-Dioxane
MW290B
Deep Bedrock Itaiitoring Wells
8260D/6020B2
X
X
COCs
COCs,As
MW35DB
Deep Bedrock Itaiitoring Wells
8260tt8270SMI
A502QB
X
X
COCs & 1,4-Dioxane
COCs & 1,40ioxane, As
Shdbw Bedrock Mori tori no
DW-01S8
Shallow Bedrock Mmitoring Wells
82600
X
COCs
MW01SB
Shallow Bedrock Mmitoring Wells
82O0
X
COCs
MW05SB
Shallow Bedrock Mmitoring Wells
82SD/6CB0B*
X
As
As
COCs,As
MW06SB
Shallow Bedrock Mmitoring Wells
8260D1
X
COCs8
MW08SB
Shallow Befrxk Monitoring Wells
82600ffl270SIMP>
X
COCs & 1,4-Dioxane
MW11SB
Shallow Bedrock Mmitoring Wells
826®
X
COCs
MW12SB
Shallow Bedrock Mmitoring Wells
826CD/6CE0B1
X
As
As
COCs.As
MW14SB
Shallow Bedrock Mmitoring Wells
82600827081^
X
COCs & 1,4-Dioxane
MW16SB
Shallow Befrxk Monitoring Wells
82600ffl270SIMP>
X
COCs & 1,4-Dioxane
MW17SB
Shallow Bedrock Mmitoring Wells
82600/827051^
X
X
COCs & 1,4-Dioxane
COCs & 1,4-Dioxane
MW18SB
Shallow Bedrock Mmitoring Wells
826£D/6Q20Bi
X
X
As
As
COCs,As
MW27SB
Shallow Bedrock Mmitoring Wells
826CD/6CBQ6*
X
X
COCs
COCs,As
MW28SB
Shallow Bedrock Mmitoring Wells
826®
X
COCs
MW29S8
Shallow Bedrock Mmitoring Wells
8260)/6020BJ
X
COCs,As
~AVffMSe
Shallow Bedrock Mmitoring Wells
82600827081^
X
COCs & 1,4-Dioxane
OW-01SB
Shallow Bedrock Mmitoring Wells
826®
X
COCs
0W-Q4SB
Shallow Bedrock Mmitoring Wells
826®
X
COCs
1 of 3
Table 4-1
-------
Table 4-1
Recommended 2024 Monitoring Program
2023 Annual Monitoring Report
Llnemaster Switch Corporation
TRC 2023 Annual
Monitoring Report
Location
Sample Point Groupkig
Anal yd cd
Method1*1
Samdki
Frequoicv^^^
Analytical Scheme
Monthly Quarterly
Seml-Annudly Amusly
Monthly Quarterly 8anl-Aiwiudly(*1 Annuity**
Overland en MonKortig WW
MW01T
Overburden Monitoriig Wels
82600
X
COCs
MWOZT
Overburden Monitoriig Wels
8260D1
X
COCs8
MWOST
Overburden Monitoriig Wels
82600/6020B*
X
X
X
As
As
COCs.As
MW04T
Overburden Monitoriig Wels
826CD/8270SM3,
6020B
X
X
COCs
COCs & 1,40ioxane, As
Mwoer
Overburden Monitoriig Wels
82600
X
X
COCs
COCs
MW11T
Overburden Monitoriig Wells
82600
X
X
COCs
COCs
MW1ZT
Overburden Monitoriig Wells
826CD/6CB0B}
X
X
As
COCs,As
MW15T
Overburden Monitoriig Wels
82600
X
COCs
MW17TD
Overburden Monitoriig Wels
8360(W27DSIM(!1
X
X
COCs & 1,4-Dioxane
COCs & 1,4-Dioxane
MW17TS
Overburden Monitoriig Wels
82600
X
X
COCs
COCs
MW1ST
Overburden Monitoriig Wels
82600
X
X
COCs
MW23T
Overburden Monitoriig Wels
82600
X
X
COCs
COCs
MW24T
Overburden Monitoriig Wels
82600
X
COCs
MW25T
Overburden Monitoriig Wels
82600
X
COCs
MW2CT"
Overburden Monitoriig Wels
826CD/602CBS37M'
X
SdaetPFAS
COCs, PFAS
COCs, As, Select PFAS
MW27T
Overburden Monitoring Wells
82600,6020B
X
COCs.As
MW2ST
Overbuden Monitoring Wells
8260D1
X
COCs6
MW2STT
Overburden Monitoriig Wels
82600
X
COCs
MW3GTD
Overburden Monitoriig Wels
8260D1
X
COCs6
MW3OTS
Overburden Monitoriig Wels
82600
X
COCs
MW31T
Overburden Monitoriig Wels
82600
X
COCs
MW32T
Overburden Monitoriig Wels
82600
X
COCs
MW33T
Overburden Monitoriig Wels
82KD/8270SIM*
X
X
COCs & 1,4-Dioxane
COCs & 1,4-Dioxane
MW34T
Overburden Monitoriig Wels
82600
X
COCs
MWEPAATD
Overburden Monitoriig Wels
8260Offl27DSIM}
X
X
COCs & 1,4-Dioxane
COCs & 1,4-Dioxane
MWEPAAT5
Overburden Monitoriig Wels
8260D1
X
X
COCs
COCs6
Dome*ttcWatvSumlvWd
GW04
Domestic Water Supply Wdls
5242
X
COCs
GW58DB*
Domestic Water Supply Wdls
82SD/82TOSIM2
X
X
X
COCs &
1,4-Dioxane
COCs & 1,4-Dioxane
COCs & 1,4-Dioxane
GTO8TA
Domestic Water Supply Wels TS
5242
X
X
X
COCs
COCs
COCs
GW38TB
Domestic Water Supply Wels "TC3
5242
X
X
X
COCs
COCs
COCs
GW38TC
Domestic Water Supply Wels "TC3
5242ffl270SIMJ
X
X
X
COCs &
1,4-Dioxane
COCs & 1,4-Dioxane
COCs & 1,4-Dimwie7
GW14
Domestic Water Supply Wdls
5242ffl270SM},
2005
X
X
X
COCs
COCs7
COCs & 1,4-Dioxane7, As
GW14E
Domeslc Water Supply Wels IB
524.2
X
X
X
COCs
COCs
COCs
GW14T
Domestic Water Supply Wels IB
524.2,2005
X
X
X
COCs
COCs
COCs,As
Gwia»
Domestic Water Supply Wels
524 2
X
COCs
GW17DB
Domestic Water Suoplv Wels
524 2
X
COCs
2 of 3
Table 4-1
-------
Table 4-1
Recommended 2024 Monitoring Program
2023 Annual Monitoring Report
Llnemaster Switch Corporation
TRC 2023 Annual
Monitoring Report
Location
Sample Point Groupkig
Analytic*
Method1*1
Frequoicv^^^
Analytical Schedide
Monthly Quarterly
Semi-Annudly Amualy
Monthly Quarterly 8anl-Arwiudly(*1 Annuity**
Domestic Water Sro-Ji; Kiel
(continued)
GW240B
Domestic Water Supply Wdls
5242
X
COCs
GW250B
Domestic Water Si*ply Wels
5242
X
COCs
GW4£D6S
Domestic Water Sipply Wels
524 2
X
X
X
COCs
COCs
COCs
GW40E
Domestic Water SwplyWels IB
5242
X
X
X
COCs
COCs
COCs
GW40T
Domestic Water SwpIv Wels IB
5242
X
X
X
COCs
COCs
COCs
GW6906
Domestic Water Supply Wdls
5242
X
COCs
GW73D6
Domestic Water Supply Wdls
5242
X
X
X
COCs
COCs
COCs
GW74D6
Domestic Water Si*ply Wdls
5242
X
X
X
COCs
COCs
COCs
GW75DB
Domestic Water Si*ply Wdls
5242
X
X
X
COCs
COCs
COCs
GW76D65
Domestic Water Sipply Wels
524.2ffl270SIM}
X
X
X
COCs
COCs
COCs & 1,4-Dirj(aie7
GW76B
Domestic Water Si*ply Wels IB
524 2
X
X
X
COCs
COCs
COCs
GW76T
Domestic Water Supply Wdls TS
5242
X
X
X
COCs
COCs
COCs
GW1QCDB
Domestic Water Supply Wdls
5242
X
(1st qfr oily)
COCs
COCs
COCs
GW101DB
Domestic Water Supply Wdls
5242
X
(Istqfrtnly)
COCs
COCs
COCs
Surface Water
SW04
Suface Watw
524.2ffl270SIM}
X
COCs & 1,4-Dioxane
SW07
Suface Water
5242ffl270SIM}
X
COCs & 1,4-Dioxane
SW18
Sixface Water
5242ffl270SIM}
X
COCs& 1,4-Dioxane
(1) Monthly sampling is performed January fhrwigh December. On those month,: when qnarttrty, Mm.anm,al or anrraal sampling i, contacted, the monthly eampKnfi i, incorporated into ft<*e sampling evert,;. Qmrtedy sampling is performed m PAraary and Aufinst The wells mcluded m
lie of 1,1-DCA, 1,1-DCB or 1,2-DCA an
e monitored at dewngradient weidential wells GW14 and GW76DB. Doe to the detection of 1,4-dimane in untreated water at potable well GW08DB, fee'
(8) Per the recommendations in the Foorft Five-Year Review, manganese analyei! will no longer be conducted during fte annual sampling event prior to each Five-Year Review.
3 of 3
Table 4-1
-------
Table 4-2
Arsenic Sampling Schedule Summary-2024
2023 Annual Monitoring Report
Linemaster Switch Corporation
TRC 2023 Annual
Monitoring Report
Well ID
Background (B)
Site Conditions (SC)
Source Area (SA)
Quarterly
(Feb/Aug)
Semi-Annual
(May)
Annual
(Nov)
Overburden Monitoring Well
MW03T
B
X
X
X
MW04T
SA
-
-
X
MW12T
B
X
X
X
MW26T
SA
-
-
X
MW27T
SC
-
-
X
Shallow Bedrock Monitoring Wells
MW05SB
SC
X
X
X
MW12SB
B
X
X
X
MW18SB
B
X
X
X
MW27SB
SC
-
-
X
MW29SB
SC
-
-
X
Shallow Bedrock Extraction Wells
MW10SB
SA
-
-
X
Deep Bedrock Monitoring Wells
MW11DB
B
X
X
X
MW12DB
B
X
X
X
MW27DB
SC
-
-
X
MW29DB
SC
-
-
X
MW35DB
SC
-
-
X
Deep Bedrock Extraction Wells
MW14DB
SC
X
X
X
Off-Site Domestic Supply Well
GW14
(untreated)
Potable well
-
-
X
GW14T
(post-treatment)
Potable well
-
-
X
Notes:
Analytical Methods:
Monitoring Wells; Method 6020B
Domestic Supply Wells; Method 200.8
lof 1
-------
TRC 2023 Annual
Monitoring Report
Table 1-3
Summary of Monitoring Program Modifications Since 2000
Linemaster Switch Corporation
2023 Annual Monitoring Report
Summary of Monitoring Program Change(s)
Date
Implemented
Documentation
Reductions in the sampling frequencies at specific monitoring locations to focus and streamline
long-term monitoring and reporting requirements, based on a review of the monitoring program
results from the previous eight years of monitoring.
2001
Proposed in a letter to the USEPA entitled Proposed Project Changes for the Linemaster Switch
Superfund Site dated 7/28/00. Approved by USEPA in letter entitled Response to Project Changes
dated 11/15/00. Changes summarized in the November 2001 Semi-Annual Report
Annual monitoring event moved from November to June of each year
June
2001
Verbally requested and approved during telephone conversation between Woodard & Curran (W&C)
and USEPA on 6/5/01.
Water level gauging frequency of all monitoring wells increased to a semi-annual basis, at a
minimum, to provide sufficient groundwater elevation data for potentbmetric surface contour
mapping during each semi-annual period.
December 2002
Self-implemented increase to monitoring program, documented in October 2003 Semi-Ann ual
Report.
Annual sampling event tor domestic water supply wells changed from December to June of each
year to improve accessibility to residents' homes during sampling events and consistent with the
monitoring program's annual (June) and semi-annual (December) events.
December
2002
Verbally requested and approved during telephone conversation between W&C and USEPA, date
unrecorded. Documented in October 2003 Semi-Ann ual Report
Monitoring frequency of GW36DB increased from semi-annually to quarterly to facilitate its use
as a sentinel well for potential effects from approved increased water withdrawals from domestic
water supply well GW09DB.
May
2003
Proposed in a letter and technical memorandum titled Proposed Change in Groundwater Extraction
Rates for Linemaster Switch Corporation, Woodstock, CT dated 3/28/03 related to GW09DB.
Approved as part of institutional control for increased water withdrawal at GW09DB recorded in land
records on 8/17/04.
Suspension of vapor sampling of the SVE system, individual extraction wells, and piezometers;
discontinuation of water level gauging of the Phase 1A area piezometers; and suspension of
sampling from the DVE equalization tank and extraction wells FW-A, FW-G, FW-F12.5, FW-F20,
FW F27.5, and FW-F39.
December
2003
Based on the Final DVE Optimization Report dated 11/21/03 and associated proposal to
reconfigure the Phase 1A Area system dated 11/17/03, the USEPA issued a letter on 11/26/03
authorizing a moratorium on the operation of the DVE system. This letter authorized the suspension
of the ineffective DVE system components and approved the proposed modifications to the
monitoring program. A final reconfiguration proposal was submitted to the USEPA on 2/25/05
(revised 4/8/05), and approved via email correspondence on 4/11/05.
Groundwater monitoring program shifted one month toiwaid from the end of each quarter
(March, June, September, and December) to the middle of each quarter (February, May, August,
and November), respectively. Subsequent Semi-Annual Reports to cover six-month, semi-
annual intervals of January to June and July to December, respectively, and continue to be
submitted within three to four months following the close of the monitoring period.
November
2004
Proposed in an email from W&C to the USEPA and CTDEEP dated 8/13/04, with approval provided
via email on 8/23/14. Documented in the Monthly Progress Report dated 12/13/04.
Two new domestic water supply wells abutting the Site to the south/southwest at 350 Route 171
(GW-73DB) and 378 Rte 171(GW-74DB) added to the monitoring program on an annual basis at
the request of the US EPA Addition of a third well located at 10 Mill brook Lane was also
proposed, however the property owner did not responded to a request to include this well in the
program.
August
2009
Requested and approved by the USEPA in an email string dated between 6/23/09 and 7/8/09.
Table 1-3
Summary of Monitoring Program Modifications Since 2000
-------
TRC 2023 Annual
Monitoring Report
Tabls 1-3
Summary o Monitoring Program Modi icafont Sines 2000
insmastsrSwite Corporation
2023 Annual monitoring sport
Summary o Monitoring Program C ange(s)
gg
Implemented
Documentation
Based on a review of the monitoring program results from the previous twenty years of
monitoring and the results of the 2009 Five-Year Review, streamlining of the monitoring and
reporting program with reduced sampling frequencies at select wells, elimination of select wells
from the monitoring program, increased sampling frequency at one well (MW28DB), a change
analytical parameters from full list VOCs to chlorinated VOCs during the quarterly and semi-
annual monitoring events, a change in progress reporting frequency from monthly to quarterly, a
change in montoring report frequency from semi-annual to annual, and addition of low-level 1,4-
dtoxane analysis during semi-annual and annual monitoring events.
January
2013
Originally proposed in a letter to the USEPA entitled Proposed Long-Term Monitoring Program
Modifications dated 2/6/12. The USEPA responded with a \etodt entitled Draft Review of Proposed
Long-Term Monitoring Program Modification by Nobis Engineering, inc. dated 2/21/12. In general,
Nobis concurred with the proposed program changes with only a tew exceptions. Based on Nobis'
review and subsequent discussion with the USEPA, a follow-up letter was submitted on 10/19/12
entiled Revised Proposed Long-Term Monitoring Program Modifications. The program revisions
proposed in the 10/19/12 letter were approved by the USEPA in an email dated 12/14/12.
Monitoring frequency of residential wells GW-14, GW-73DB, and GW-74DB increased from
annual to quarterly to evaluate and monitor TCE detections reported from GW-14 in May and
August 2013.
August
2013
Formally proposed in the Quarterly Progress Report (October to December 2013) dated 2/15/14 an
implemented thereafter.
Two new domestic water supply wells abutting the Site to the south/southwest at 10 Millbrook
Lane (GW-76DB) and 15 Millbrook Lane (GW-75DB) added to the monitoring program on an
quarterly basis based on TCE detections of TCE in GW-14
November
2014
Formally proposed in the Quarterly Progress Report (July to September 2014) dated 11/14/14 and
incorporated into the monitoring program, as documented in the Quarterly Progress Report (October
to December 2014).
Significant changes to the scope were implemented, as described in more detail in the Sampling
and Analysis Plan for the Long-Term Monitoring Program issued and approved by EPA in 2015.
These included:
1) Annual monitoring event was moved from May to November each year.
2) Urtemaster personnel to conduct monthly sampling of the IRTS influent, effluent and final
discharge tor months that do not include a quarterly, semi-annual or annual sampling event
3) The Phase 1A system extraction well sampling frequency was changed from quarterly to semi-
annually.
4) Deep bedrock monitoring well MW21DB sampling frequency was changed from annually to
semi-annually, due to increasing VOC concentrations.
5) The sample locations and analytical methods tor 1,4-dtoxarte analysis were modfied.
8) The number of off-site domestic wells sampled during the annual event was reduced, based
on recent on-site results.
7) The surface water sample locations were revised.
8) The monitoring program was revised to reflect additional 1,4-dtoxarte and manganese
analyses during the annual sampling events conducted immediately before the performance of
Five-Year Reviews (i.e., every five years starting with the 2018 annual event) and to trigger future
1,4-dtoxarte analysis if specific CVOC compounds are detected.
May - November
2015
Aspartofa change in consultants from Woodard and CurrantoTRC Environmental Corporation, a
re-evaluation of the monitoring program was conducted as part of the development of TRCs
Sampling and Analysis Plan for the Long-Term Monitoring Program dated November 2015. These
changes were formally approved by USEPA via email on November 16,2015. Changes in the
sampling program implemented prior to this date (e.g., changing the annual sampling event from
May to November) were communicated to the USEPA verbally or via email prior to their
implementation and were conducted with USEPA concurrence.
1LTM> Rapufrg (OHy art AiroS)9BJSa2JAmuS(raJHrtl1_TaMM My ferRertwl
2 Of 5
Summary of
V TRC
Table 14
sgram Modifications Sines 2000
-------
TRC 2023 Annual
Monitoring Report
Tabls 1-3
Summary o Monitoring Program Modi ieaSons Sines 2000
insmastsrSwite Corporation
2023 Annual monitoring sport
Summary o Monitoring Program C ange(s)
gg
Implemented
Documentation
Changes to the monitoring program made in 2016 were associated w8h 1,4-dbxane analysis in
accordance with the commitments made in the 2015 Sampling and Analysis Plan described
above or recommendations made in fihe 2015 Annual Monitoring Report They included the
following:
1) The addition of 1,4-dbxane analysis at wells GW12DB, MW28DB, GW08DB, GW14, FW-F35
and FW-i due to the detection of 1,1-DCA, 1,2-DCEor 1,1-DCE in these wells in 2015 or 2016;
2) The temporary addition of 1,4-dioxane analysis at domestic wells GW06OB, GW20DB,
GW21DB, GW26, and GW270B due to detections of 1,4-dioxane at wells MW08DB and
MW21DB; and
3) The temporary addition of MW14SB to the semi-annual sampling event in May 2016, due to
the detection of 1,4-dbxane in this well in November 2016.
2016
Changes were documented in the EPA-approved 2015 Sampling and Analysis Plan for the Long-
Term Monitoring Program or within the 2015 Annual Sampling Report, upon which EPA provided
comments on June 7,2016. EPA comments were addressed in a submittal dated July 21,2016.
Changes to the monitoring program made in 2017 were associated w8h 1,4-dbxane analysis in
accordance with the commitments made in the 2015 Sampling and Analysis Plan described
above, or recommendations made in the 2016 Annual Monitoring Report. They included the
following:
1) The temporary addition of 1,4-dbxane analysis at wells GW24DB, GW250B and GW76DB
due to the continued detection of 1,4-dbxane in the samples collected from MW21 DB and the
detection of 1,4-dbxane in the GW08DB production well;
2) The discontinuation of 1,4-dbxane analysis at domestic wells GW06OB, GW21DB, GW26,
and GW270B, given that the presence of 1,4-dioxane in wells MW08SB or MW08DB was not
confirmed in 2016 and that 1,4-dbxane was not detected in the downgradient residential wells
(the only residential well to the southeast that was resampled in 2017 was residential well
GW20DB, as this well is downgradient of MW14SB);
3) The addition of the newly installed wells (deep bedrock well MW35DB and shallow bedrock
wells DW-01SB, OW-01 SB and OW-04SB).
2017
Changes were documented in the EPA-approved 2015 Sampling and Analysis Plan for the Long-
Term Monitoring Program or within the 2016 Annual Sampling Report. No comments on the 2016
Annual Sampling Report were issued.
Changes to the monitoring program made in 2018 were associated with commitments made in
the 2015 Sampling and Analysis Plan described above, or recommendations made in the 2017
Annual Monitoring Report They included the following:
1)The discontinuation of temporary 1,4-dioxane analysis at wells GW24DB and GW250Bdueto
the lack of detections in these two wells and the lack of exceedances of the CTDPH action level
at upgradbnt wells MW21 DB and GW08DB;
2) The incorporation of recently installed wells (deep bedrock well MW35DB and shallow bedrock
wells DW-01SB, OW-01 SB and OW-04SB) into the annual sampling program (MW35DB is also
sampled semi-annually).
3) The temporary performance of 1,4-dbxane analyses at three Phase 1A extraction wells and
the temporary performance of manganese analyses at select wells in support of the upcoming
2019 Five-Year Review.
2018
Changes were documented in the EPA-approved 2015 Sampling and Analysis Plan for the Long-
Term Monitoring Program or within the 2017 Annual Sampling Report. No comments on the 2017
Annual Sampling Report were issued.
1LTM> Repwffi^ (CHy aitf AiroS)9BJSa2JAmuS(raJHrtl1_TaMM My fcrRwtwl
3 Of 5
Summary of
TRC
Table 14
JEfleaiEong SEnee 2000
-------
TRC 2023 Annual
Monitoring Report
Table 1-3
Summary o Monitoring Program Modi ications Since 2000
inemasterSwitc Corporation
2023 Annual Monitoring eport
Summary o Monitoring Program C ange(s)
Date
Implemented
Documentation
Changes to the monitoring program made in 2019 were associated with commitments made in
the 2015 Sampling and Analysis Plan described above, or recommendations made in the 2018
Annual Monitoring Report They included the following:
(1) The reduction of the frequency of 1,4-dbxane analyses at select on-site wells and surface
water sample locations from annually to every five years (prior to each five-year review)
(2) The discontinuation of temporary 1,4-dbxane analyses at domestic well GW20DB and the
reduction of the frequency of 1,4-dioxane analyses at domestic well GW14from semiannually to
annually due to the lack of detections in this well since 2016.
(3) Due to the lack of detections of 1,4-dbxane in untreated rater at domestb well GW14 since
2016,1,4-dbxane analysis was continued only for untreated annual samples for domestb wells
GW17 and GW76DB.
2019
Changes were documented in the EPA-approved 2015 Sampling and Analysis Plan tor the Long-
Term Monitoring Program or within the 2018 Annual Sampling Report. No comments on the 2018
Annual Sampling Report were issued.
Changes to the monitoring program made in 2020 were associated with commitments made in
the 2015 Sampling and Analysis Plan described above, or recommendatbns made in the 2019
Annual Monitoring Report They included the following:
(1) The inclusion of deep bedrock monitoring well MW27DB and shallow bedrock monitoring well
MW27SB in the 1st quarterly sampling event of 2020 based on recent detectbris of CVOCs in
these wells. Well MW27SB and domestb wells GW04DB and GW17DB were included in the
May 2020 Semi-Annual event
(2) The additbn of temporary 1,4-dbxane analyses at potable supply well GW40DB on a semi-
annual schedule based on thedetectbn of 1,2-dbhloroethane in August 2019.
(3) The discontinuation of further sampling from surface water locatbns SW01, SW13 and SW14
based on the lack of historical detectbns of constituents of concern at these locations. Surface
rater samples will be limited to locations SW04, SW07 and SW18 on an annual basis.
(4) The additbn of 1,4-dbxane as an analyte at MW04T to provide a source area data point for
statistical analyses.
(5) Domestb well GW250B was sampled in February 2021 to verify that total trihalomethane
compounds detected above the drinking rater standard in 2020 were attributable to the
homeowner's "shocking" of the well and were only present temporarily.
(6) The formalization of a quarterly inspection of the domestic/potable water supply treatment
systems associated with four domestic/potable well sampled on a quarterly basis: GW08DB,
GW14, GW40DB and GW76DB.
2020
Changes were documented in the EPA-approved 2015 Sampling and Analysis Plan tor the Long-
Term Monitoring Program or within the 2019 Annual Sampling Report. EPA issued two comments
on the 2019 An n ual Sam pi in g Re port via emai I on J u ne 2,2020 regard in g the stuck pu m p in
MW22DB and the initiatbn of quarterly inspections of the domestic/potable rater supply treatment
systems.
HWMIIKTUi)niuMUnf>-T«m Maitolng PragimV-THPRspattigV-TliP Rapwthg (OtyuldAinitf)amM0ZIAlllutf-\
TbM> 1 -2 to 1 -UOEUM. Progsm end LTM» Ctim»*L2C2«31
4 of 5
<>TRC
Table 1-3
Summary of Monitoring Program Modifications Since 2000
-------
TRC 2023 Annual
Monitoring Report
Tabls 1-3
Summary o Monitoring Program Modi ieaSons Sines 2000
insmastsrSwite Corporation
2023 Annual monitoring sport
Summary o Monitoring Program C ange(s)
gg
Implemented
Documentation
Changes to the monitoring program made in 2021 were associated with commitments made in
the 2015 Sampling and Analysis Plan described above, or recommendations made in the 2020
Annual Monitoring Report They included the following:
(1) After increasing the sampling frequency of deep bedrock monitoring well MW27DB and
shallow bedrock monitoring well MW27SB in 2020 due to chlorinated VOC detections, sampling
frequency reverted back to semiannual and annual, respectively, in 2021. The temporary semi-
annual sampling of GW04 and GW17DB performed in 2020 due to these detections was also
eliminated in 2021.
(2) Based on the consistent lack of detection of site-related contaminants at levels of concern in
perimeter deep bedrock monitoring wells MW08DB, MW18DB and GW36DB, semi-annual
monitoring at these wells was eliminated. These wells continue to be sampled on an annual
basis.
(3) Based on the consistent lack of detection of site-related contaminants in select domestic
water supply wells and in sentinel/upgradient wells, domestic water supply wells GW07DB,
GW20DB, GW23DB, and GW70DB were eliminated from the LTMP.
(4) The temporary semi-annual 1,4-dioxane analyses at potable supply well GW40DB, initiated
duetoal ,2-dichloroethane detection in August 2019, was eliminated after 1,4-dfoxane was not
detected in 2020.
(5) Domestic well GW250B was sampled in February 2021 to verify that total trflialomethane
compounds detected above the drinking water standard in 2020 were attributable to the
homeowner's "shocking" of the well and were only present temporally.
(6) At the request of USEPA, additional characterization of groundwater tor per- and
polyfluoroalkyl substances (PFAS) and/or select metals (arsenic, beryllium and cadmium) was
conducted in January 2021 and as part of the semi-annual and annual sampling events.
2021
Changes to the LTMP were documented in the USEPA-approved 2015 Sampling and Analysis Plan
for the Long-Term Monitoring Program or within the 2020 Annual Sampling Report Additional
characterization for PFAS was conducted in accordance with a 2020 PFAS Sampling and Analysis
Plan and associated responses to USEPA comments approved by the USEPA via email on January
5,2021. In comments on the Supplemental Human Health Risk Assessment submittal received on
May 5,2021, the USEPA requested that select metals analyses, including arsenic, beryllium and
cadmium, be included within the May 2021 semi-annual sampling event Therefore, 34 on-site wells
were sampled and analyzed for these analytes during the May 2021 sampling event At USEPA's
request, TRC submitted a scope of work on October 12,2021, describing baseline sampling
(additional PFAS and arsenic analyses) to be incorporated into the November 2021 annual sampling
event USEPA comments were provided via emaB on October 19 and a teleconference was held
the same day to discuss the scope. A revised sampling plan table was submitted to USEPA via
email on October 20 and USEPA email concurrence was received the same day.
Changes to the monitoring program made in 2022 were associated with recommendations made
in the 2021 Annual Monitoring Report They included the following:
(1) Modification of the analyte list for all sample analyses except tor IRTS samples to only include
the new list of constituents of concern (COCs) identified in cooperation with USEPA based on a
supplemental human health risk assessment
(2) Incorporation of arsenic at select well locations in accordance with recommendations made in
the 2021 Annual Monitoring Report
2022
Changes to the LTMP were documented within the 2021 Annual Sampling Report (revision of
analyte list and add tonal arsenic analyses).
Changes to the monitoring program made in 2023 were associated with a request from USEPA
to include PFAS analysis on select wells. They included the following:
(1) Incorporation of PFAS at select well locations in accordance with a request made by USEPA
2023
Changes to the LTMP were documented within the 2022 Annual Sampling Report (additonal PFAS
analyses). Original request was made via email dated February 8,2023 with Subject line:
Linemaster Switch (PFAS)
V TRC
Table 14
-------
TRC 2023 Annual
Monitoring Report
Table 3-3a
Summary of Mann-Kendall Statistical Evaluation Results
VOC and ICE Concentrations
Linemaster Switch Corporation
2023 Annual Monitoring Report
Location
All Historic
2019 to 2023
Total VOCs | TCE
Total VOCs I TCE
Reconfigured Phase 1A System
- Extraction Weils
FW-E
Stable
No Trend
Stable
Stable
FW-F35
Stable
Stable
Probably Decreasing
Probably Decreasing
FW-H
Decreasing
Decreasing
Stable
No Trend
FW-I
Decreasing
Decreasing
No Trend
No Trend
FW-J
Decreasing
Decreasing
Increasing
Increasing
MW10SB
Decreasing
Decreasing
No Trend
No Trend
Deep Bedrock Extraction Wells
GW08DB
Decreasing
Decreasing
Decreasing
Decreasing
GW10DB
Decreasing
Decreasing
No Trend
Probably Increasing
MW01DB
Decreasing
Decreasing
Decreasing
Decreasing
MW06DB
Decreasing
Decreasing
Decreasing
Decreasing
MW14DB
Decreasing
Decreasing
Stable
Stable
MW15DB
Decreasing
Decreasing
Decreasing
Decreasing
MW17DB
Decreasing
Decreasing
No Trend
No Trend
Deep Bedrock Monitoring Wells
GW12DB
Decreasing
Decreasing
Stabie
Stable
GW36DB
Decreasing
Decreasing
No Trend
No Trend
MW08DB
No Trend
Decreasing
ND
ND
MW11DB
Decreasing
Decreasing
Probably Decreasing
ND
MW12DB
Decreasing
Decreasing
No Trend
ND
MW18DB
No Trend
Decreasing
ND
ND
MW21DB
No Trend
No Trend
Stable
Stable
MW22DB
No Trend
ND
ND
ND
MW27DB
Decreasing
Decreasing
Stable
Stable
MW28DB
Increasing
Increasing
Decreasing
Decreasing
MW29DB
Decreasing
Decreasing
Stable
Stable
MW35DB
Decreasing
Decreasing
Stable
Probably Decreasing
Shallow Bedrock Monitoring Wells
DW-01SB
No Trend
No Trend
No Trend
No Trend
MW01SB
Probably Decreasing
No Trend
N/A
N/A
MW05SB
No Trend
Decreasing
Stable
Stable
MW06SB
Decreasing
Decreasing
Stable
Stable
MW08SB
Decreasing
Decreasing
Stable
ND
MW11SB
Decreasing
Decreasing
Decreasing
Decreasing
MW12SB
No Trend
Decreasing
No Trend
ND
MW14SB
No Trend
Decreasing
ND
ND
MW15SB
Decreasing
Decreasing
Stable
Stable
MW17SB
Increasing
Decreasing
Decreasing
Decreasing
MW18SB
No Trend
ND
ND
ND
MW27SB
No Trend
Decreasing
Stable
Stable
MW28SB
No Trend
Decreasing
Stable
Stable
MW29SB
No Trend
No Trend
No Trend
No Trend
MWEPAASB
Increasing
Increasing
Increasing
Increasing
OW-01SB
Decreasing
No Trend
Stable
No Trend
OW-04SB
Decreasing
No Trend
Stable
No Trend
TRC
Table 3-3a
Summary of Mann-Kendall
Statistical Evaluation Results
Table 3-3 2023 mk Results 20240327 1 of 2 VOC and TCE Concentrations
-------
TRC 2023 Annual
Monitoring Report
Table 3-3a
Summary of Mann-Kendall Statistical Evaluation Results
VOC and ICE Concentrations
Linemaster Switch Corporation
2023 Annual Monitoring Report
Location
All Historic
2019 to 2023
Total VOCs | TCE
Total VOCs I TCE
g Weils
MW01T
Decreasing
Decreasing
Stable
Stable
MW02T
Decreasing
Decreasing
No Trend
No Trend
MW03T
Decreasing
Decreasing
ND
ND
MW04T
Decreasing
Decreasing
Increasing
Increasing
MW06T
Decreasing
Decreasing
Increasing
Increasing
MW11T
No Trend
Decreasing
No Trend
No Trend
MW12T
Stable
ND
No Trend
ND
MW15T
Decreasing
Decreasing
Increasing
Increasing
MW17TD
Increasing
Decreasing
Stable
Decreasing
MW17TS
Decreasing
Decreasing
No Trend
Probably Increasing
MW18T
No Trend
ND
Stable
ND
MW23T
Decreasing
Decreasing
Stable
No Trend
MW24T
Decreasing
Decreasing
Stable
Stable
MW25T
Decreasing
Decreasing
Stable
Stable
MW26T
Decreasing
Decreasing
Stable
Probably Decreasing
MW27T
No Trend
Decreasing
No Trend
Stable
MW28T
Probably Decreasing
Decreasing
Stable
Stable
MW29T
Probably Decreasing
Decreasing
No Trend
No Trend
MW30TD
Decreasing
Decreasing
Stable
No Trend
MW30TS
No Trend
Decreasing
ND
ND
MW31T
Decreasing
Decreasing
Stable
Stable
MW32T
No Trend
Decreasing
No Trend
ND
MW33T
Decreasing
Decreasing
Decreasing
Decreasing
MW34T
No Trend
Decreasing
ND
ND
MWHPAATD
Increasing
Increasing
Decreasing
Decreasing
MWEPAATS
Decreasing
Decreasing
Decreasing
Decreasing
Off-SRe Domestic
WiTii
QW14
increasing
Increasing
Decreasing
Decreasing
GW76DB
Stable
Decreasing
Decreasing
Decreasing
SUMMSry
42 Decreasing
18 No Trend
4 Stable
6 Increasing
OND
ON/A
54 Decreasing
7 No Trend
1 Stable
4 Increasing
4 ND
0 N/A
14 Decreasing
16 No Trend
26 Stable
5 Increasing
8 ND
1 N/A
16 Decreasing
14 No Trend
17 Stable
7 Increasing
15 ND
1 N/A
Notes:
VOCs = Volatile Organic Constituents
TCE = Trichloroethene
N/A = Not Sampled
ND = Not Detected
MW17DB short-term trends are based on data collected from 2019 to 2021, as well MW17DB was not sampled in 2022 or 2023.
TRC
Table 3-3a
Summary of Mann-Kendall
Statistical Evaluation Results
Table 3-3 2023 mk Results 20240327 2 of 2 VOC and TCE Concentrations
-------
TRC 2023 Annual
Monitoring Report
Table 3-3b
Summary of Mann-Kendall Statistical Evaluation Results
1,4-Dioxane Concentrations
Linemaster Switch Corporation
2023 Annual Monitoring Report
2019 to 2023
Location
1,4-Dioxane
Deep Bedrock Extraction Wells
GW08DB
No Trend
MW14DB
No Trend
MW15DB
Decreasing
Deep Bedrock Monitoring Wells
MW28DB
Decreasing
MW35DB
Stable
Shallow Bedrock Monitoring Wells
MW15SB
Stable
MW17SB
Stable
MWEPAASB
Decreasing
Overburden Monitoring Wells
MW04T
Increasing
MW17TD
No Trend
MW33T
Decreasing
MWEPAATD
Decreasing
Domestic Supply Wells
GW14
No Trend
GW76DB
Stable
Summary
5 Decreasing
4 No Trend
4 Stable
1 Increasing
Table 3-3b
Summary of Mann-Kendall
Statistical Evaluation Results
Table 3-3_2023_ mk Resuits_202403i 1 .xisx 1 of 1 1,4-Dioxane Concentrations
-------
TRC 2023 Annual
Monitoring Report
<>TRC
-------
TRC 2023 Annual
Monitoring Report
<>TRC
-------
TRC 2023 Annual
Monitoring Report
<>TRC
-------
TRC 2023 Annual
Monitoring Report
Table 3-4B
Summary of Detected VOCs In Water Samples
Deep Bedrock Extraction Well
Llnemaster Switch Corporation
2023 Annual Progress Report
Location Group:
Deep Bedrock Extraction Well
Wefl Name:
GW10DB
MW
1DB
Sample Date:
02/14/2023
05/09/2023
08*18/2023
10/30/2023
02/14/2023
05/09/2023
08/08/2023
10/30/2023
Screening Criteria
Sample Event:
2023 February
Quarterly
2023 May Semi-
Annual
2023 August
Quarterly
2023 November
2023 February
Quarterly
2023 May Semi-
Annual
2023 August
Quarterly
2023 November
12307954
L2325815
12345941
12307954
L2325815
12345941
Note/Method:
8280 COCs
8280 COCs
8280 COCs
8280 COCs/
8270 SIM
8280 COCs
8280 COCs
8280 COCs
8280 COCs/
8270 SIM
Dilution Factor:
CTDEEP RSR Criteria
CTDPH
EPAVISL
ROD
SDWA
Human
10
10
10
10/1
1
1
1
1
SamjjleT^jje:
Action
Resid-
Com-
Cleanup
Health
Analyte
GWPC
SWPC
RES V/C
I/C V/C
Level
ential
mercial
Level
MCL
NRWQC
Result (Q)
Result
(U)
Result (Q)
Result (Q)
Result (Q)
Result
Result
Result (Q)
PCE-TCE and Associated Breakdown Compounds
Tetrachla-oethene
5
88
340
810
5
28.2
123
5
5
10
5.00
IJ
5.00
IJ
5.00
IJ
5.00
IJ
0.500
IJ
0.500
IJ
0.500
IJ
0.500 U
Trichliroetheiie
S
2,340
27
87
1
2.08
12.9
5
5
0.8
221
182
181
193
0.500
IJ
0.304 J
0.312 J
0.753
ds-1.2-DichlorDethene (ds-l,2-DCH5
70
NE
NE
NE
NE
418
1,750
70
70
NE
1,280
853
1,100
1,230
1.08
1.02
0.897
1.37
trars-l.^-lJIchlorDettiene (trans-l,2-DCE)
100
NE
NE
NE
NE
178
737
NE
100
100
40.0
24.8
33.4
34.2
0.750
U
0.750
U
0.750
u
0.750 U
Vinyl chloride (VQ
2
15,750
1.8
52
0.5
0.197
3.28
2
2
0.022
1.88 J
10.0
u
10.0
U
10.0
U
1.00
U
1.00
U
1.00
u
1.00 U
Remaining Method 8280 or 524.2 VOC Compo
mds
1,2-Dichloropropane
S
NE
7.4
58
1
11.8
50.7
5
5
0.9
17.5
U
17.5
u
17.5
U
17.5
U
1.75
U
1.75
U
1.75
u
1.75 U
Acetone
700
NE
50,000
50,000
NE
NE
NE
3,700
NE
NE
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Fthanol
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Ethylbenzene
700
580,000
50,000
50,000
NE
8.88
30
NE
700
88
5.00
U
5.00
u
5.00
u
5.00
U
0.500
u
0.500
u
0.500
u
0.500 U
m,p-Xylene
SSO
NE
21,300
50,000
NE
732
3,080
NE
10,000
NE
10.0
U
10.0
u
10.0
u
10.0
U
1.00
u
1.00
u
LOO
u
1.00 U
o-Xylene
530
NE
21,300
50,000
NE
988
4,140
NE
10,000
NE
10.0
IJ
10.0
IJ
10.0
IJ
10.0
IJ
1.00
IJ
1.00
IJ
1.00
IJ
1.00 U
Toluene
1,000
4,000,000
23.500
50,000
150
35,200
148,000
1,000
1,000
57
7.50
U
7.50
u
7.50
u
7.50
U
0.750
u
0.750
u
0.750
u
0.750 U
1.4-Dtorane and Associated Indicator Compounds
1,4-Dioxane (8270E Lw-Level SIM)
NE
NE
NE
NE
3
5,290
23.100
NE
NE
NE
N/A
4.85
N/A
0.0801 J
1,4-Dioxane (SW8280D)
NE
NE
NE
NE
3
5,290
23.100
NE
NE
NE
2,500
II
2,500
IJ
2,500
IJ
R
250
IJ
250
IJ
250
IJ
R
1,1,1-Trichliroethane (TCA)
200
82,000
8,500
18,000
200
NE
NE
200
200
10,000
N/A
N/A
N/A
N/A
l.l-Uichloroettiene (l.l-IJCh)
7
98
190
920
7
297
1,250
7
7
300
3.43 J
5.00
u
2.70 J
2.72 J
0.500
u
0.500
u
0.500
u
0.500 U
1,1-Dichloioethane (1,1-DCA)
70
NE
3.000
41,000
25
12.4
54.2
NE
NE
NE
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
1,2-Dichloroethane (1,2-DCA)
1
2,970
8.5
88
0.5
NE
NE
5
5
9.9
5.00
U
5.00
u
5.00
u
5.00
u
0.500
u
0.500
u
0.500
u
0.500 U
t» kUntlfl«d criurtu, MC3 or action l*v»l
I/C V/C: In.
nll&«
« of LO. Tk» KPA VTSI. are alogortud *»
Th» Sm. V/C and IPA VISLapplyto all off-iHa domMlc l^fly aj im0uMW34T«bI GW12DB,dwlo tfe*kpmiiffl*y
to lU ep-a» rrtna. lb« cf GWMDH (f»d% p«lil» w»D) aod GWIODH (WoodDock Hgmhall poobki**!).
Th»I/C V/C and ComnwclalEPA YISI. afply 10 all oin*» mon»(rtig and MacOoomlliai mlaiCWnDB (TitHy potafck w»H) and off
fu doowfllc l^ply ml GWIODH (Woodaock Towofcall polabk mil).
ROD: HKOid ofDoddm
NRWqC: Nttfe nal RKommandtd WMt Q«al*y CrtMrta (Updaad 2015). NKW)C a^plyto tmTtn rate
-------
TRC 2023 Annual
Monitoring Report
Table 3-4B
Summary of Detected VOCs In Water Samples
Deep Bedrock Extraction Well
Llnemaster Switch Corporation
2023 Annual Progress Report
Location Group:
Deep Bedrock Extraction Well
Wefl Name:
MW
6DB
MW14DB
Sample Date:
02/14/2023
05/09/2023
08/08/2023
10/30/2023
02/14/2023
06/02/2023
08/08/2023
10/30/2023
Screening Criteria
Sample Event:
2023 February
Quarterly
2023 May Semi-
Annual
2023 August
Quarterly
2023 November
2023 February
Quarterly
2023 June Semi-
Annual
2023 August
Quarterly
2023 November
12307954
L2325615
12345941
12307954
12330954
12345941
Note/Method:
8260 COCs
8260 COCs
8260 COCs
8260 COCs/
8270 SIM
8260 COCs
8260 COCs/8270
SIM
8260 COCs
8260 COCs/
8270 SIM
Dilution Factor:
CTDEEP RSR Criteria
CTDPH
EPAVISL
ROD
SDWA
Human
1
1
1
1
1
1
1
1
SamjjleT^jje:
Action
Resid-
Com-
Cleanup
Health
Analyte
GWPC
SWPC
RES V/C
I/C V/C
Level
ential
mercial
Level
MCL
NRWQC
Result (Q)
Result (Q)
Result
Reptrtlng (QWy and Annua I) \3033WW 3 Annua IVTablesWOC Swnmary\ Sumiaiy of Detected VOCs
303K»37_V0C swimwy Tables_SO33jVmu0_v3xisx In Deep BeOxc* Extraction Well Swnples
Deep Be<*oc* Extraction wei Page2of3
-------
TRC 2023 Annual
Monitoring Report
Table 3-4B
Summary of Detected VOCs In Water Samples
Deep Bedrock Extraction Well
Llnemaster Switch Corporation
2023 Annual Progress Report
Wefl Name:
MW15DB
Screening Criteria
Sample Event:
2023 February
Quarterly
2023 May Semi-
2023 May Semi-
2023 August
Quarterly
2023 November
2023 November
Lab Report:
12307954
L2325815
12325815
12345941
12384838
12384838
Note/Method:
8280 COCs
8280 COCs/8270
SIM
8280 COCs
8280 COCs
8280 COCs/
8270 SIM
8280 COCs/
8270 SIM
Dilution Factor:
CTDEEP RSR Criteria
CTDPH
EPA VISI.
ROD
SDWA
Human
1
1
1
1
1
1
Sample T^jje:
Acttui
Resid-
Com-
Cleanup
Health
Field Dup
Field Dup
Analyte
GWPC
SWPC
RES V/C
I/CV/C
Level
ential
mercial
Level
MCL
NRWQC
Result (Q)
Result
'4)
Result (Q)
Result (Q)
Result (Q)
Result
4)
PCE-TCE and Associated Breakdown Compounds
Tetrachloroethene
5
88
340
810
5
28.2
123
5
5
10
0.500
II
0.500
II
0.500
II
0.500
II
0.500
II
0.500
II
TricUonjeftene
5
2,340
27
87
1
2.08
12.9
5
5
0.8
14.8
20.4
17.8
21.1
23.8
24.0
ds-1.2-Dichloroethene (dj-l,2-DCE)
70
NE
NE
NE
NE
418
1,750
70
70
NE
23.0
18.5
18.2
13.8
11.3
11.5
trans-1.2-1)ichloroethene (trans-l,2-DCE5
100
NE
NE
NE
NE
178
737
NE
100
100
0.587 J
0.424 J
0.401 J
0.498 J
0.504 J
0.447 J
Vinyl chloride (VC)
2
15,750
1.8
52
0.5
0.197
3.28
2
2
0.022
0.282 J
0.287 J
0.184 J
0.107 J
1.00
U
0.095 J
Remaining Method 8280 or 524.2 VOC Cwnpo
inds
1,2-Dichloropropane
5
NE
7.4
58
1
11.8
50.7
5
5
0.9
1.75
U
1.75
u
1.75
U
1.75
U
1.75
U
1.75
u
Acetone
700
NE
50,000
50,000
NE
NE
NE
3,700
NE
NE
N/A
N/A
N/A
N/A
N/A
N/A
Fthanol
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
N/A
N/A
N/A
N/A
N/A
N/A
Ethylbenzene
700
580,000
50,000
50,000
NE
8.88
30
NE
700
88
0.500
U
0.500
u
0.500
U
0.500
U
0.500
U
0.500
u
m.p-Xyiene
530
NE
21,300
50,000
NE
732
3,080
NE
10,000
NE
1.00
U
1.00
u
1.00
U
1.00
U
1.00
U
1.00
u
o-Xylene
530
NE
21,300
50,000
NE
988
4,140
NE
10,000
NE
1.00
IJ
1.00
IJ
1.00
IJ
1.00
IJ
1.00
IJ
1.00
IJ
Toluene
1,000
4,000,000
23,500
50,000
150
35,200
148,000
1,000
1,000
57
0.750
u
0.750
u
0.750
u
0.750
u
0.750
U
0.750
u
1,4-Dioxane and Associated Indicator Compounds
1,4-Dioxane (8270E Low-Level SIM)
NE
NE
NE
NE
3
5,290
23,100
NE
NE
NE
N/A
0.174
N/A
N/A
0.23
0.238
1,4-Dioxane (SW8280D)
NE
NE
NE
NE
3
5,290
23,100
NE
NE
NE
250
II
250
II
250
II
250
II
R
R
1.1, l-Trlchloroethane (TCA)
200
82,000
8,500
18,000
200
NE
NE
200
200
10,000
N/A
N/A
N/A
N/A
N/A
N/A
1,1-Dichloroethene (1,1-DCHJ
7
98
190
920
7
297
1,250
7
7
300
0.500
u
0.500
u
0.500
u
0.500
u
0.500
u
0.500
u
1.1 -D ichloruethane (1,1-DCA)
70
NE
3.000
41,000
25
12.4
54.2
NE
NE
NE
N/A
N/A
N/A
N/A
N/A
N/A
1.2-Dichloroethane (1,2-DCA)
1
2,970
8.5
88
0.5
NE
NE
5
5
9.9
0.500
u
0.500
u
0.500
u
0.500
u
0.500
u
0.500
u
Total VOCs: 38.489 39.785 34.185 35.303 35.834 38.278
SWPC: Smha W«l«r Praxlta Cdurtt
r» IdwttiM crtwrt*. MCL or Mkm Unl.
b! 12S-QV
0. TU KPA VISI. rrf GW10DH (WooiBoti Tcwrfall pcubk w«U).
lt» IC V'C «nd Cammwdtl KPA VISI. apply lo dloMbnaflMtaguiMMfcaiNlbM wHmCWWDH (bcttypottUtmll) off-
i^ply ml GWMDB (WoofeWck Towufctll poufck mil).
KRWJC: NuBoral SiarauU WMwQuXyCrtw* (tfpfctd M15). NHMJC applyUisSiowalK nab only.
SDWA: Sab DrtAtog W*M Art. SDWA MCI. of* Igl. applM lo M*1 Irf
'TRC
Table 3-4H
H:\HAZMATUhemaster\Long-Temi Monitoring ProywrALTMP Report^LTHP Reptrtlng (QWy and Annua I) \3033WW 3 Annua IVTablesWOC Swnmary\ Slimiaiy of Detected VOCs
303K»37_V0C swimwy Tables _SO33jVmu0_v3xisx In Deep BeOxc* Extraction Well Swnples
Deep Be<*odt Extraction We! Page3of3
-------
nunlai Factor:
Sanjjle Type:
Location Group:
Well Name:
Sancle Date:
Deep
ledrock Mtrtttrim Well
CW12DB
GW38DB
MWWDB
MW
1DB
MW
2DB
05/102023
10/30/2023
10/30/2023
10/31/2023
11/01/2023
05/082023
10/30/2023
05/11/2023
10/31/2023
Screening Criteria
2023MaySemi-
2023 Novenber
2023 Novenber
2023 Novenfcer
2023 Novenfcer
2023MaySemi-
2023 Novenber
2023MaySemi-
2023Novenfcer
ate/Method:
1280 COCs
S28OCOCs/S270
SIM
S28OCOCs/S270
SIM
1280 COCs
1280 COCs/
1270 SIM
1280 COCs
1280 COCs
1280 COCs
1280 COCs
CTDEEP HSH Criteria
CTOPH
Action
Lewi
ROD
Level
SDWA
MCL
Human
Health
NRWQC
Resid-
Com-
Field Hop
GWPC
SWPC
EES V/C
VCV/C
PC E-TCE and Associated Breakdown Convoun
ds
TMracWoroMhHit
S
n
MO
110
5
2*2
123
5
5
10
a500 U
a500 U
a 500 u
a500 U
a500 U
a500 U
a500 U
a500 U
a500 U
TdcUoaKthew
5
2,340
27
87
2.08
12X
5
5
ae
102
83.0
84X
OJOO U
OJOO U
OJOO U
OJOO U
OJOO U
OJOO U
ds-U-DlchlonKdwc (ds-l^-DCB)
TO
NB
NB
NB
NE
418
1,750
70
70
NE
153
150
148
OJOO U
OJOO U
0X17
0.481 J
OJOO U
OJOO U
mmi-l,2-DicWoTRC
H^i*ZM*TVJr*TB8twV-tro-T«rn MorKtorine Pro^mV-TM> wp0rtliXpV™PR^*^(QW»8i^*i*«l)OT3Varo*i*<*W««6\V0CSimwry\
-------
TRC 2023 Annual
Monitoring Report
Dilution Factor:
SamjleType:
Location Group:
Wen Name:
SannleDate:
.Imlttrlm Well
MW1IDB
MW21DB
MW
2DB
MW
7DB
MW
IDB
10/31/2023
05/11/2023
11/02/2023
11/02/2023
05/11/2023
11/01/2023
05/10/2023
10/31/2023
02/14/2023
02/14/2023
05/10/2023
05/10/2023
Screening Criteria ^
ample Event:
2023 Novenber
2023 May Seml-
2023 Novenber
2023 Novenber
2023*feySeml-
2023Novenfcer
2023 May Seiml-
2023Novenfcer
2023 Febnaiy
Qnsvtedv
2023 Fehnaiy
Qasvtedv
2023*feySeml-
2023 May Seimi-
tote/Method:
1290 COCl
1290 COCl
1290 COCl/
1270 SIM
1290 COCl
1290 COCl
1290 COCl
1290 COCl
1290 COCl
1290 COCl
1290 COCl
1290 COCl/
1270 SIM
1290 COCl/
1270 SIM
CTDEEP BSRCriterla
t-TWH
Actlai
Level
SOD
Level
SDWA
MCI.
Human
Health
NEWQC
Hald-
Con-
Held Dap
Held Dap
Held Dap
^^nal]rt^^^_
GWPC
SWPC
KESVlC
I/CV/C
Besnlt CCD
Itenl! CO)
Itenl! CO)
Itenl! CCD
Itenl! CO)
Itenl! CO)
Itenl! CO)
Itenl! CCD
Itenl! CO)
Itenl! CO)
Itenl! CO)
Itenl! CCD
PCE-TCE and Ainclated Breakdown Comoro
S
u
340
110
i
212
123
i
5
10
OJOO U
OJOO u
OJOO u
OJOO u
OJOO u
OJOO u
OJOO u
OJOO u
OJOO u
OJOO u
OJOO u
OJOO u
rlchlo " nf
5
2.340
27
87
IM
12.9
5
5
0.9
OJOO U
17.4
HI
119
OJOO u
OJOO u
OJOO u
OJOO u
18.9
187
23.7
23.3
dl-U-I)ichIaw*i«it (df-U-DCE)
70
NE
NE
NE
NE
419
1,750
70
70
NE
OJOO U
3.M
35.5
39.9
OJOO u
OJOO u
OJOO u
OJOO u
203
201
14.7
14.2
bHU-l^-DlcUonxdmc (bsni-l,2-DCE)
100
NE
NE
NE
NE
179
737
NE
100
100
0.750 U
0X59 J
1J1
1.29
0.750 U
0.750 U
0.750 U
0.750 U
0X30 J
0X29 J
0X27 J
0J84 J
Vinyl chlwlde [VQ
2
15,750
IX
52
0J
0197
Ul
2
2
0.022
1X0 U
1X0 U
0.220 J
0.253 J
1X0 U
1X0 U
1X0 U
1X0 U
0.139 J
0.154 J
1X0 U
0X98 J
Remaining Method 1290 if 524.2 VOC Cwnoour
1,2-DtcUonvnjKue
5
NE
7.4
51
1
1L9
507
s
5
0.9
1.75 U
1.75 U
1.75 U
1.75 U
1.75 U
1.75 U
1.75 U
1.75 U
1.75 U
1.75 U
1.75 U
1.75 U
Acetone
700
NE
50,000
50,000
NE
NE
NE
3,700
NE
NE
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Ednnol
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
700
5*0.000
50.000
50.000
NE
9J9
30
NE
700
9*
OJOO u
OJOO u
OJOO u
OJOO u
OJOO u
OJOO u
OJOO u
OJOO u
OJOO U
OJOO U
OJOO U
OJOO U
ivp-Xylene
530
NE
21,300
50,000
NE
732
3,0*0
NE
10,000
NE
1X0 u
1X0 u
1X0 u
1X0 u
1X0 u
1X0 u
1X0 u
1X0 u
1X0 U
1X0 U
1X0 U
1X0 U
o-XyWit
530
NE
21,300
50,000
NE
9t9
4,140
NE
10,000
NE
1X0 u
1X0 u
1X0 u
1X0 u
1X0 u
1X0 u
1X0 u
1X0 u
1X0 U
1X0 U
1X0 U
1X0 U
Totaene
1,000
*000,000
23J00
50,000
150
35,200
141,000
1,000
1,000
57
0750 U
0750 U
0750 U
0750 U
0750 U
0750 U
0750 U
0750 U
0750 U
0750 U
0.750 U
0.750 U
1,4-Dloon (I270K Low-Lewi SIM)
NE
NE
NE
NE
3
5,290
23,100
NE
NE
NE
IX*
0.297
0J22
5,290
U-DlcUoioediene 11,1-DCE)
7
94
190
920
7
297
1,250
7
7
300
OJOO U
OJOO U
OJOO U
OJOO U
OJOO U
OJOO U
OJOO U
OJOO U
OJOO U
OJOO U
OJOO U
OJOO U
1,1-Dldiloioetiiaiie (1,1-DCA)
70
NE
3,000
41,000
25
12.4
54.2
NE
NE
NE
1
<>TRC
HAH«MATYJnwT»t®UlTi0-T»Tri MortMng Pro^wnlLTW ftporlngU-TMP R«porlti0 (Otlyand «musl)\202}\202}«™iusOT»bl«WOC Sunmwy\
2024CC27_VOC Surwnaiy T aU w^2023_Arr«l _y2. xtex
Dwp Bm*a* Mortlaing Wol
-------
Dilution Factor:
Sam>le Type:
.Imlttrlm Well
Wen Name:
MW
IDB
MW
8DB
MW
5DB
Screening Criteria
2023 Aagu*
2023 Anpm
2023 November
2023 November
2023*feySeml-
2023Novenber
2023*feySeml-
2023 November
Note/Method:
1280 COCl
1280 COCl
1280 COCl/
1270 SIM
1280 COCl/
1270 SIM
1280 COCl
1280 COCl
1280 COCl/
1270 SIM
1280 COCl/
1270 SIM
CTDEEP BSRCriterla
V.TUI"H
Actiwi
Level
SOD
Level
SDWA
MCI.
Health
NEWQC
2.5/1
Hald-
Cun-
Held Dap
Field 11 up
CWPC
SWPC
RESViC
I/CV/C
Besnlt CO)
Itenl! CO)
Itenl! CO)
Itenl! CO)
Itenl! CO)
Itenl! CCD
Banlt CO)
B«nK [Q
PCE-TCE and Aiiodatcd Breakdown Comoro
it
i
u
340
110
i
212
123
i
5
10
OJOO U
OJOO u
OJOO u
OJOO u
OJOO u
OJOO u
OJOO U
145 €
TrlcHoiwdwit
5
2.340
2T
87
IM
124
5
5
0.8
113
1T.T
14.2
14.T
OJOO u
a402 J
24.0
82.4
cU-U-I)ichIaw*i«it Iii-U-DCE)
70
NE
NE
NE
NE
418
1,750
TO
TO
NE
11.8
1L7
1X5
T.T8
OJOO u
OJOO u
81.0
325
bHU-l^-DlcUonxdmc (bsni-l,2-DCE)
100
NE
NE
NE
NE
1T8
T3T
NE
100
100
0401 J
0415 J
0.484 J
0.484 J
0.T50 U
0.T50 U
0477
348
Vinyl chlwlde [VC)
2
15.T50
14
52
0J
0.187
Ul
2
2
0.022
0.072 J
04)88 J
1X0 U
1X0 U
1X0 U
1X0 U
0.451 J
148 J
ifjiBlnlm Method 1280 w 5244 VOC Cwnoour
1 2-DtcUonvnvane
5
NE
T.4
51
1
1L8
50.7
s
5
0.8
1.T5 U
1.T5 U
1.T5 U
1.T5 U
1.T5 U
1.T5 U
1.75 U
441 U
Acetone
TOO
NE
50,000
50,000
NE
NE
NE
3.TOO
NE
NE
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Etfnnol
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
TOO
5*0.000
50.000
50.000
NE
648
30
NE
TOO
8*
0.500 U
a 500 u
a 500 u
a 500 u
a 500 u
a 500 u
a 500 u
145 U
ivp-Xylene
530
NE
21J00
50,000
NE
T32
3,0*0
NE
10,000
NE
1X0 U
1X0 u
1X0 u
1X0 u
1X0 u
1X0 u
1X0 u
2J0 U
o-Xjrlene
530
NE
21J00
50,000
NE
8S8
4,140
NE
10,000
NE
1X0 U
1X0 u
1X0 u
1X0 u
1X0 u
1X0 u
1X0 u
2J0 U
Totaene
1,000
*000,000
23J00
50,000
150
35,200
141,000
1,000
1,000
5T
0.T50 U
0.T50 U
0.T50 U
0.T50 U
0.T50 U
0.T50 U
0.750 U
141 U
1,4-Dlozane (12 TOR Low-Lewi SIM)
NE
NB
NB
NB
S
5,280
23,100
NB
NB
NB
0.1T2
0.184
1X4
34
l,4-Dio»iie (SW1280D)
NE
NE
NE
NE
S
5,280
23,100
NE
NE
NE
250 U
250 U
250 U
250 U
250 U
250 U
250 U
825 U
1,1-DlcUoni-Biitene 11,1-DCE)
T
88
190
820
T
28T
1,250
T
T
300
OJOO U
OJOO U
OJOO U
0.500 U
0.500 U
0.500 U
0.500 U
0425 J
U-DicUonttdmne (1,1-DCA)
TO
NE
3,000
41,000
25
12.4
54.2
NE
NE
NE
N/A
N/A
1
Total voc«: sars sain 22.no 23.111 nd 0.402 htjm smjos
IMm:
TRC 2023 Annual
Monitoring Report
<>TRC
H AH«MATYJnWTWt»UlIi0-T»Tri Morttalng FVo^ariYTkr ftporlngU-TMP Rjporttig (QHy and Arr«l)\202J\202J AmaMtUwWX SurfTBJyV Sumrwy of DstSChd VOCs
2024CBZ7.V0C SurrrBTy I»»s_203_/mjjljia*ta In Owp B«tw* Morttolng Wrt Sjirp»!
Dwp B»4ix* Mortlwing Mid Psg»JofJ
-------
TRC 2023 Annual
Monitoring Report
Table 3-4D
Summary of Detected VOCs In Water Samples
Shallow Bedrock onltorlng Well
Llnemaster Switch Corporation
2023 Annual Progress Report
Location Group:
Shallow Bedrock Monitoring Well
Well Name:
MW05SB
MwoeSB
MW08SB
MW11SB
MW12SB
MW14SB
MW15SB
MW17SB
Screening Criteria
Sample Event:
2023 November
Annual
2023Novembc
2023 November
Annual
2023Nwemlw
2023 November
Annual
2023 November
2023 November
Annual
2023 May Semi-
2023 November
Annual
Lab Report:
L2364846
12364846
L2364929
12364636
L2384848
12384648
12384929
12325980
12384929
ote/Method:
8280 COCs
8280 COCs/
8270 SIM
8280 COCs/
8270 SIM
8280 COCs
8280 COCs
8280 COCs/
8270 SIM
8280 COCs/
8270 SIM
8280 COCs/
8270 SIM
8280 COCs/
8270 SIM
Dilution Factor:
CTDEEP RSR Criteria
CTDPH
EPA VIS I.
ROD
SDWA
Human
1
1
1
1
1
1
1
1
1
Action
Resid-
Com-
Cleanup
Health
Analyte
GWPC
SWPC
RESV/C
I/CV/C
Level
ential
mercial
Level
MCL
NRWQC
Result (Q)
Result (Q)
Result (Q)
Result (Q)
Result (Q)
Result (Q)
Result (Q)
Result (Q)
Result (Q)
PCE-TCE and Associated Breakdown Compounds
Tetradiloroethene
5
88
340
810
5
28.2
123
5
5
10
0.500
u
0.500
u
0.500
u
0.500
U
0.500
u
0.500
u
0.500
u
0.500
U
0.500
U
I'richloroettietie
5
2,340
27
87
1
2.08
12.9
5
5
0.8
0.255 J
1.28
0.500
u
0.349 J
0.500
u
0.500
u
155
11.0
3.08
ds-l,2-Dichloroethene (cfc-l,2-DCE5
70
NE
NE
NE
NE
418
1,750
70
70
NE
0.500
u
0.500
u
0.190 J
0.500
u
0.500
u
0.500
u
128
18.4
12.8
trans-l,2-DichloiDethene (trans-L2-DCE3
100
NE
NE
NE
NE
17B
737
NE
100
100
0.750
u
0.750
u
0.750
u
0.750
u
0.750
u
0.750
u
8.50
1.89
0.987
Vinyl chloride (VC)
2
15,750
LB
52
0.5
0197
3.28
2
2
0022
1.00
u
LOO
u
1.00
u
LOO
u
1.00
u
LOO
u
2.17
0.1 IB J
0.352 J
Remaining Method 8280 or 524.2 VOC Compov
indj
l,2-Dichlon>iropane
5
NE
7.4
58
1
11.8
507
5
5
0.9
1.75
u
L75
u
1.75
u
L75
u
1.75
u
L75
u
0.230 J
L75
u
1.75
u
Acetone
700
NE
50,000
50,000
NE
NE
NE
3,700
NE
NE
NZA
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Kthflnol
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
Fltrylbciwt*
700
580,000
50,000
50,000
NE
888
30
NE
700
88
0.500
u
0.500
u
0.500
u
0.500
u
0.500
u
0.500
u
0.500
u
0.500
u
0.500
u
m,p-Xy1oie
530
NE
21,300
50,000
NE
732
3,080
NE
10,000
NE
1.00
u
1.00
u
1.00
u
1.00
u
1.00
u
1.00
u
1.00
u
LOO
u
1.00
u
o-Xylene
530
NE
21,300
50,000
NE
988
4,140
NE
10,000
NE
1.00
u
1.00
u
1.00
u
1.00
u
1.00
u
1.00
u
1.00
u
1.00
u
1.00
u
Toluene
1,000
4,000,000
23,500
50,000
150
35.200
148,000
1,000
1,000
57
0.750
u
0.750
u
0.750
u
0.750
u
0.750
u
0.750
u
0.750
u
0.750
u
0.750
u
1,4-Dioiene and Associated Indicator Compounds
1,4-Dioxane (8270E Low-Lewi SIM)
NE
NE
NE
NE
3
5.290
23,100
NE
NE
NE
N/A
0.144
u
0.139
u
N/A
N/A
0.139
u
2.35
149
138
1,4-Dioxane (SW82B0D)
NE
NE
NE
NE
3
5.290
23,100
NE
NE
NE
250
u
250
u
250
u
R
250
u
250
u
250
u
108 J
181 J
1,1,1-Trichloiueftane (TCA)
200
82,000
6,500
18,000
200
NE
NE
200
200
10,000
N/A
N/A
N/A
N/A
N/A
N/A
N/A
1,1-Dichloioethene (1,1-DCE)
7
98
190
920
7
297
1,250
7
7
300
0.500
u
0.500
u
0.500
u
0.500
u
0.500
u
0.500
u
0.748
20.0
242
1,1-Dichloroethane (1,1-DCA)
70
NE
3,000
41,000
25
12.4
542
NE
NE
NE
N/A
N/A
N/A
N/A
N/A
N/A
N/A
1,2-DicHoroethane (1,2-DCA)
1
2,970
B5
88
0.5
NE
NE
5
5
9.9
0.500
u
0.500
u
0.500
u
0.500
u
0.500
u
0.500
u
0.500
u
0.689
0.851
*11 nukl repottd ii microgmmi par littr ( f/Tf.
o r mor» IdnttM crittrta, MCL or a rtto lw»l
|M ta Hop V
n (RRft}la*»la1tlalealfcriitoaifarl,4-£oia»mrabbw
¦*» (H).
¦11E-M
tirgti oeor rilk or ttrgn hrord loflotofix. Tfc»H"A VISLmealcgaindiatoKMkiMtiiilaid Camm»rd»lertt»ri».
TbRKV/C ed Rni4iefl»lKPA VIS. Jpptylo nil doomtic i^plywwlliuirtll» MW34Tiuid GW12DB, de» lo *»lrproilD4y
B tht w*k (W Maptba ofCWOtDB (f«dl*y potabb wJI) tad CWUirn (WmtoxfcToniUlpolaUtmU).
lt»WC V/C«adCamm»rd»lH'AVISI.»pplyto»lloa-ill»ino«1tori«g«ad MradtoamUiBmUBGWIIDB (fadlty poofcUmlQudoff-
dl> ixnmtlc npply ml CW4SDB (Woodtiotfc Tom*»H pottfcl* ml).
ROD: Rteord of Didsioa
WWqC: Htflonl Wnttr QwSty Crittrt. (Upkld Ml 5). NKWJCupplylonrtiCTmttrrHilttoaly.
SDWA: S«f»Dri^g WHO Art. SDYVAMCL of SI a)
•>TRC
T»We 3-40
H :M 1A7M AT\Unemaster\Long-Term MorJttTlng PrograrMLTW RepaHng\LTMP Reportlrq (Qtrly and Amual)\3033\3033 AmualUablesVll .Tables Ready 10" Re vie \Revle Completes Summary of Detected VOCs
Table 3-4A-H_V0CSvnmary Tables InSalo Bedrock Monitoring Well Samples
S alio Bedrock Morttoft^ Weil Page 1 of 3
-------
TRC 2023 Annual
Monitoring Report
Table 3-4D
Summary of Detected VOCs In Water Samples
Shallow Bedrock onltorlng Well
Llnemaster Switch Corporation
2023 Annual Progress Report
Location Group:
Shallow Bedrock Monitoring Well
Well Name:
MW18SB
MW27SB
MW28SB
MW29SB
MWEPAASB
DW-01SB
OW-01SB
OW-04SB
Screening Criteria
Sample Event:
2023 November
Annual
2023 May Semi-
2023 November
Annual
2023Nwemlw
2023 November
Annual
2023Novembc
2023 November
Annual
2023Novembc
2023 November
Lab Report:
L2364636
12326330
L2384929
12384648
12364846
L2365119
12365119
L2365119
12365119
ote/Method:
8260 COCs
8260 COCs
8260 COCs
8260 COCs
8260 COCs
8260 COCs/
8270 SIM
8260 COCs
8260 COCs
8260 COCs
Dilution Factor:
CTDEEP RSR Criteria
CTDPH
EPA VIS I.
ROD
SDWA
Human
1
1
1
1
1
20^1
2000
25
25/100
Action
Resid-
Com-
Cleanup
Health
Analyte
GWPC
SWPC
RESV/C
I/CV/C
Level
ential
mercial
Level
MCL
NRWQC
Result (Q)
Result (Q)
Result (Q)
Result (Q)
Result (Q)
Result (Q)
Resuk (Q)
Result (Q)
Resuk (Q)
PCE-TCE and Associated Breakdown Compounds
Tetradiloroethene
5
88
340
810
5
28.2
123
5
5
10
0.500
u
0.500
U
0.500
u
0.500
U
0.500
u
10.0
u
1,000
u
5.38 J
12.5
U
Tricbloroethene
5
2,340
27
67
1
2.06
12.9
5
5
0.6
0.500
u
0.500
u
0.500
u
0.500
u
8.74
2,130
298,000
570
23.3
tis-l,2-Dichloniethene (cij-l,2-DCE3
70
NE
NE
NE
NE
416
1,750
70
70
NE
0.500
u
0.500
u
0.500
u
0.500
u
0.500
u
775
44,300
2,750
4,840
trans-l,2-DichloroekiM(l»laad Camniard»lerttari».
TWKM.V/C ed Rni4iefl»lKPA VIS. Jpptylo nil doomtic i^plywwlliuirtll» MW34Tiuid GW12DB, de» lo *»lrproilD4y
B (W w*k tha aaaptba ofCWOtDB (facility potobla wall) aad CWUirn (WmtoxfcTonaUlpoUUanaU).
ItaWC V/CaadCammardalH'AVISI. apply to all oa-ill»inoatori«gaad vdractioa walls » wall nGHTCIDR (fadlty poafcla wall) tad off-
illa ixnmtlc Hpplyml CW4SDB (Woodtiotfc Towa*aIl pottfcla ml).
ROD: Raeord of Dadsioa
WWqC: Halloaal Walar QwSty Crtwi. (Upkld Ml 5). NKM)CapplytOI»fa»watar>*ialt>oaly.
SDWA: SafaDrfaUag WHO Art. SDYVAMCL of SI a)
•>TRC
H:\HAZMAI\UncfnartcALong-TCTm Mortterfng ProgrBm\LTW RepcrtfngU-THP Reporting (QWysnd Annud)\2
-------
TRC 2023 Annual
Monitoring Report
Table 3-4E
Summary of Detected VOCs in Wata- Sanvles
O ertxrden ontormg Well
Lkiemaster Switch Corporation
2023 Annual PrageM Report
Location Group:
Overburden Monitoring Well
Well Name:
MW01T
MW02T
MW03T
MV,
04T
MV
fl»T
MV,
11T
Sample Date:
11/02/2023
11/01/2023
10/31/2023
05/11/2023
11/02/2023
05/11/2023
10/31/2023
05/09/2023
10/30/2023
Screening Criteria
Sample Event:
2023 November
2023 November
2023 Nove rter
2023M*ySeml-
2023 November
2023 MaySeml-
2023 Nove rter
2023M*ySeml-
2023 November
Lab Report:
L2365119
L2364929
L2364646
L2326330
L2365119
12326330
L2364646
L2325615
L2364636
Note/Method:
8260 COCs
8260 COCs/
8270 SIM
8260 COCs
8260 COCs
8260 COCs/
8270 SIM
8260 COCs
8260 COCs
8260 COCs
8260 COCs
Dilution Factor.
CTDEEP HSR Criteria
CTT1PH
KPAV1SL
ROD
SDWA
Human
1
1
1
100
5/400/1
1
1
1
1
Action
Resid-
Com-
Cleanup
Health
Analyte
GWPC
SWPC
RES V/C
I/CV/C
Level
ential
mercial
Level
MCL
NRWQC
Result (Q)
Result (O)
Result (Q)
Result (Q)
Result (Q)
Result (O)
Result fQ)
Result (Q)
Result (Q)
PCE-TCE and Associated Breakdown Compounds
Tetrachloroethene
5
St
340
810
5
28.2
123
5
5
10
0.500
u
0.500 U
0.500 U
32.2 J
41.0
0.500 U
0.500 U
0.500
U
0.500
II
Trfchloroethene
5
2,340
27
67
1
2.06
12.9
5
5
0.6
0.259 J
0.354 J
0.500 U
10,800
15,700
0.500 U
0.500 U
0.500
U
0.500
U
cii-1,2-DicWotoethene (ds-l,2-DCE)
70
NE
NE
NE
NE
416
1,750
70
70
NE
0.477 J
0.500 U
0.500 U
509
561
0.500 U
0.500 U
0.500
U
0.500
u
trans-1,2-Dfchloroethene (traas-l,2-DCE)
100
NE
NE
NE
NE
176
737
NE
100
100
0.750
u
0.750
u
0.750
U
75.0
u
8.34
0.750
u
0.750
U
0.750
u
0.750
u
Vinyl chloride (VQ
2
15,750
1.6
52
0.5
0.197
3.28
2
2
0.022
1.00
u
1.00
u
1.00
u
100
u
0.585 J
1.00
u
1.00
U
1.00
u
1.00
u
Remalnlne Method 8260 or 524.2 VOC Compounds
1,2-Dlchloio propane
5
NE
7.4
58
11.6
50.7
5
5
0.9
1.75
u
1.75
u
1.75
11
175
u
8.75
U
1.75
u
1.75
U
1.75
11
1.75
u
Acetone
700
NE
50,000
50.000
NE
NE
NE
3,700
NE
NE
Ettanol
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Ethyl) enzene
700
mm
50,000
50,000
NE
6.86
30
NE
700
68
0.500
u
0.500 U
0.500 U
50.0
u
2.50
U
0.500 U
0.500 U
0.500
u
0.500
u
m,p-Xylene
530
NE
21,300
50,000
NE
732
3,080
NE
10,000
NE
1.00
u
1.00
u
1.00
u
100
u
5.00 U
1.00
u
1.00
u
1.00
u
1.00
u
o-Xylene
530
NE
21,300
50,000
NE
986
4,140
NE
10,000
NE
1.00
u
1.00
u
1.00
u
100
u
5.00 U
1.00
u
1.00
u
1.00
u
1.00
u
Toluene
1,000
4,000,000
23,500
50,000
150
35,200
148,000
1,000
1,000
57
0.750
u
0.750
u
0.750
u
75.0
u
3.75
u
0.750
u
0.750
u
0.750
u
0.750
u
1,4-Dlazane and Associated Indicator Compounc
1,4-Dloaute (827OF Low-Level SIM)
NE
NE
NE
NE
3
5,290
23,100
NE
NE
NE
0.139
u
60.3
N/A
1,4-Dtaone (SW8260D)
NE
NE
NE
NE
3
5,290
23,100
NE
NE
NE
250 U
250
u
250
u
25,000
u
1,250
u
250
u
250
u
250 U
R
1,1,1-Trichloroettane (TCA)
200
62,000
6,500
16,000
200
NE
NE
200
200
10,000
N/A
1,1-Dlchloroethene (1,1-DCE)
7
96
190
920
7
297
1,250
7
7
300
0.500
u
0.500 U
0.500 U
19.0 J
19.6
0.500 U
0.500 U
0.500
u
0.500
u
1,1-Dlchloroethtne (1,1-DCA)
70
NE
3,000
41,000
25
12.4
54.2
NE
NE
NE
N/A
l,2-Dichloroeth*ne (1,2-DCA)
1
2,970
6.5
68
0.5
NE
NE
5
5
9.9
0.500
u
0.500 U
0.500 U
50.0
u
2.50
u
0.500 U
0.500 U
0.500
u
0.500 U
<>TRC
H:WAZMAT\Lh«m8Stw\Long-T«rm Monitoring Rsp(rtig\LTM> Rspotlng (atrlywd Arnia)\2C23V3(B3 AmurtTrtteWOC S«nmsry\
203«237_VOC summery Tubl«s_2023Jnnud j<2.]ds»
Ovwtwd«r Morftwtig Wdl
T«W«3-4E
Summery if DetscWd VOCs
In Owrbud«r Morftwtig Wsll Sanies
Pegs 1 of 4
-------
TRC 2023 Annual
Monitoring Report
2023 Annual Proyess Report
Dilution Factor:
Location Group:
Well Name:
Sample Date:
Overburden Monitoring Well
MW12T
MW15T
MW17TS
MW17TTI
MW18T
MV,
I23T
MW24T
10/31/2023
11/01/2023
05/10/2023
11/01/2023
05/10/2023
11/01/2023
10/30/2023
05/11/2023
11/02/2023
11/01/2023
Screening Criteria „ , _
Sample Event:
2023 Noventer
2023 November
2023 M*y Seml-
2023 November
2023 May Seml-
2023 November
2023 November
2023 MaySeml-
2023 Noventer
2023 November
ate/Method:
8260 COCs
8260 COCs
8260 COCs
8260 COCs
8260 COCs/
8270 SIM
8260 COCs/
8270 SIM
8260 COCs
8260 COCs
8260 COCs
8260 COCs
CTI1HT RSR Criteria
CTOPH
Action
Level
ra>A vrsi.
ROD
Cleanup
Level
SDWA
MCL
Human
Health
NRWQC
1
1
1
1
1
1
1
1
1
1
Resld-
entlal
Com-
mercial
Analyte
GWPC
SWPC
RESV/C
TIC VIC
Result (Q)
Result (Q)
Result (Q)
Result (O)
Result (Q)
Result (Q)
Result (Q)
Result (O)
Result (Q)
Result tO)
PCE-TCE and Associated Breakdown Compounds
TetracMoroethene
5
St
340
310
5
28.2
123
5
5
10
0.500 U
0.500 U
0.500 U
0.500 U
0.500 U
0.500 U
0300 U
0.500 U
0.500 U
0.500 U
TrlcMoroethene
5
2,340
27
67
1
2.06
12.9
5
5
0.6
0.500 U
2.60
0300 U
0.500 U
3.62
2.72
0300 U
0.247 J
0.802
0.653
ds-l^-rUcUoroeUteiK (ds-l,2-DCE)
70
NE
NE
NE
NE
416
1,750
70
70
NE
0.500 U
0.546
0300 U
0.500 U
11.5
11.7
0300 U
0.500 U
0.500 U
0.298 J
tnro-12-rHdtloroetheiie (trans-12-DCF)
100
NE
NE
NE
NE
176
737
NE
100
100
0.750 U
0.750 U
0.750 U
0.750 U
0.750 U
0.750 U
0.750 U
0.750 U
0.750 U
0.750 U
Vinyl chloride (VC)
2
15,750
1.6
52
0.5
0.197
3.28
2
2
0.022
1-00 u
1.00 U
1.00 U
1.00 U
0.093 J
0.134 J
1.00 U
1.00 U
140 U
1.00 U
Remaining Method 8260 or 524.2 VOC Compounds
l,2-DlcMoroprop*ne
5
NE
7.4
53
114
50.7
5
5
0.9
1.75 U
1.75 U
1.75 U
1.75 U
1.75 U
1.75 U
1.75 U
1.75 U
1.75 U
1.75 U
Acetone
700
NE
50,000
50,000
NE
NE
NE
3,700
NE
NE
Etta mil
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
EthylbeiPtne
700
530,000
50400
50,000
NE
6.86
30
NE
700
68
0.500 U
0.500 U
0300 U
0.500 U
0.500 U
0.500 U
0300 U
0.500 U
0.500 U
0.500 U
m,p-Xylene
530
NE
21,300
50,000
NE
732
aoso
NE
10,000
NE
1-00 u
1.00 U
1.00 U
1.00 U
140 U
1.00 U
1.00 U
1.00 U
140 U
1.00 U
o-Xylene
530
NE
21,300
50,000
NE
936
4,140
NE
10,000
NE
1-00 u
1.00 U
1.00 U
1.00 U
140 U
1.00 U
1.00 U
1.00 U
140 U
1.00 U
Toluene
1,000
4,000,000
23300
50,000
150
35,200
148,000
1,000
1,000
57
0.750 U
0.750 U
0.750 U
0.750 U
0.750 U
0.750 U
0.750 U
0.750 U
0.750 U
0.750 U
1,4-Dlozane and Associated Indicator Compounc
1,4-LHaane (8270F Low-Level SIM)
NE
NE
NE
NE
3
5,290
23,100
NE
NE
NE
106
113
N/A
1,4-Dlozane (SW8260D)
NE
NE
NE
NE
3
5,290
23,100
NE
NE
NE
250 U
250 U
250 U
250 U
63.3 J
107 J
R
250 U
250 U
250 U
1,1,1-Trtchloroettane fTCA)
200
62,000
6,500
16,000
200
NE
NE
200
200
10,000
N/A
1,1-LHcMoroethene fl.l-DCR
7
96
190
920
7
297
1,250
7
7
300
0.500 U
0.500 U
0300 U
0.500 U
39.1
36.1
0300 U
0.500 U
0.500 U
0.500 U
1,1-DicMoroettane (1,1-DCA)
70
NE
3,000
41,000
25
12.4
54.2
NE
NE
NE
N/A
1,2-Dlchloroettane (1,2-DCA)
1
2,970
6.5
63
0.5
NE
NE
5
5
9.9
0.500 U
0.500 U
0300 U
0.500 U
138
1.46
0300 U
0.500 U
0.500 U
0.500 U
4l.*fe>I|oHjta.,knr_aF-U-< (fl. SWPC Srtc. WU^Protocfc. Qitak
BoUrdvriM Main cwlMMKkd *»¦ XU IrMlo bib H«j. V/C BaJMrf Cnwfeltv Vabtmahm CHhri.
Total VOCs: ND 3.146 ND ND 225.193 272.114 ND 1247 0.802 1951
jb MW34T ul CW12DB, da
W»M«kTnMpi>U
w*oGWMDBff-
<>TRC
H:WAZMAT\Lh«m8SW\Long-T«rm Monitoring Pm(r»nV_™> B«ort»ig\I TM> Rspotlng (atrlywd Arnia)\2C23V3(B3 Am»IVT«teWOC S«nmsry\
203«237_VOC summery Tubl«s_2023Jnnud j<2.]ds»
Ovwtwd«r Morftwtig Wdl
T«W«3-4E
Summery if DetscWd VOCS
In Owrbud«r Morftwtig Well Sanies
Pegs 2 of 4
-------
Table 3-4E
Summary of Detected VOCs in Wato- Sanvles
0 ertxrden ontormg Well
Lkiemaster Switch Corporation
2023 Annual PrageM Report
Dilution Factor:
Location Grow):
Overburden Monitoring Well
Screening Criteria ^
Well Name:
MW25T
MW
26T
MW27T
MW28T
MW29T
MW30TS
MW30TD
MW31T
MW32T
temple Date:
smple Event
11/02/2023
05/09/2023
10/30/2023
11/01/2023
10/31/2023
10/31/2023
11/02/2023
1 MB/2023
11/02/2023
11/01/2023
2023 Noventer
2023M*ySeml-
2023 November
2023 November
2023 Noventer
2023 November
2023 November
2023 November
2023 Noventer
2023 November
ate/Method:
8260 COCs
8260 COCs
8260 COCs/
8270 SIM
8260 COCs
8260 COCs/
8270 SIM
8260 COCs
8260 COCs
8260 COCs/
8270 SIM
8260 COCs
8260 COCs
CTI1HT RSR Criteria
CTOPH
Action
Level
ra>A vrsi.
ROD
Cleanup
Level
SDWA
MCL
Human
Health
NRWQC
1
400
250/1
1
1
1
1
1
1
1
Resld-
entlal
Com-
mercial
Analyte
GWPC
SWPC
RESV/C
TIC VIC
Result (Q)
Result (Q)
Result (Q)
Result (O)
Result (Q)
Result tO)
Result (Q)
Be suit (O)
Result (Q)
Result tO)
PCE-TCE and Associated Breakdown Compounds
TetracMoroethene
5
St
340
310
5
28.2
123
5
5
10
0.500 U
200 U
125 U
0.500 U
0.500 U
0.500 U
0400 U
0.500 U
0.500 U
0.500 U
TrichloroeUieiie
5
2,340
27
67
1
2.06
12.9
5
5
0.6
0.197 J
35,400
47,400
0.500 U
0.500 U
0.500 U
0400 U
0.500 U
5.74
0.500 U
ds-l i-lJichloroelliei*; (cls-l,2-l)CK)
70
NE
NE
NE
NE
416
1,750
70
70
NE
0.192 J
2,610
3470
0.500 U
0.500 U
0.500 U
0400 U
0.500 U
0.427 J
0.500 U
trans-1 ,2-LHcMoroethene (trans-12-DCF)
100
NE
NE
NE
NE
176
737
NE
100
100
0.750 U
319
577
0.750 U
0.750 U
0.750 U
0.750 U
0.750 U
0.228 J
0.750 U
Vinyl chloride (VC)
2
15,750
1.6
52
0.5
0.197
3.28
2
2
0.022
1-00 u
400 U
24.8 J
1.00 U
140 U
1.00 U
1.00 U
1.00 U
140 U
1.00 U
Remaining Method 8260 or 524.2 VOC Compounds
l,2-DlcMoroprop*ne
5
NE
7.4
53
114
50.7
5
5
0.9
1.75 U
700 U
438 U
1.75 U
1.75 U
1.75 U
1.75 U
1.75 U
1.75 U
1.75 U
Acetone
700
NE
50,000
50,000
NE
NE
NE
3,700
NE
NE
Etta mil
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
EthylbeiPene
700
530,000
50400
50,000
NE
6.86
30
NE
700
68
0.500 U
200 U
83.8 J
0.500 U
0.500 U
0.500 U
0400 U
0.500 U
0.500 U
0.500 U
m,p-Xylene
530
NE
21,300
50,000
NE
732
aoso
NE
10,000
NE
1-00 u
400 U
250 U
1.00 U
140 U
1.00 U
1.00 U
1.00 U
140 U
1.00 U
o-Xylene
530
NE
21,300
50,000
NE
936
4,140
NE
10,000
NE
1-00 u
400 U
250 U
1.00 U
140 U
1.00 U
1.00 U
1.00 U
140 U
1.00 U
Toluene
1,000
4,000,000
23300
50,000
150
35,200
148,000
1,000
1,000
57
0.750 U
300 U
220
0.750 U
0.750 U
0.750 U
0.750 U
0.750 U
0.750 U
0.750 U
1,4-Dloxane and Associated Indicator Compounc
1,4-Dtaane (8270F Low-Level SIM)
NE
NE
NE
NE
3
5,290
23,100
NE
NE
NE
0.3 UJ
0.144 U
0.213
1,4-nionme (SW8260D)
NE
NE
NE
NE
3
5,290
23,100
NE
NE
NE
250 U
100400 U
R
250 U
250 U
250 U
250 U
250 U
250 U
250 U
1,1,1-THcMoroettane fTCA)
200
62,000
6,500
16,000
200
NE
NE
200
200
10,000
1,1-LHcMoroethene fl.l-DCR
7
96
190
920
7
297
1,250
7
7
300
0.500 U
200 U
125 U
0.500 U
0.500 U
0.500 U
0400 U
0.500 U
0.500 U
0.500 U
1,1-DicMoroettane (1,1-DCA)
70
NE
3,000
41,000
25
12.4
54.2
NE
NE
NE
1,2-DlcMoroettane (1,2-DCA)
1
2,970
6.5
63
0.5
NE
NE
5
5
9.9
0.500 U
200 U
125 U
0.500 U
0.500 U
0.500 U
0400 U
0.500 U
0.500 U
0.500 U
4l.*feiIp»l>jta.,knr_aF-U-< (fl. SWPC Srtc. WU^Protocfc. Qitak
BoldulvriM Main cwlMMKkd *»¦ XU bib H«j. V/C BaJMrf Cnwfeltv Vabtmahm CHhri.
Total VOCs: 0.389 38,329 52,176 ND ND ND ND 1213 6.395 ND
rTRC
TsWe:HE
Surrrrery tf Detected VOCs
In Overbwden Moritwtig Well Swnples
Page 3 of 4
-------
TRC 2023 Annual
Monitoring Report
2023 Annual Proyess Report
Location Group:
Ove
turden Moiitortne Well
WeU Name:
MV
/33T
MW34T
MWEPAATS
Mwra>AATn
Sample Date:
05/10/2023
11/02/2023
11/01/2023
05/10/2023
11/02/2023
05/10/2023
11/02/2023
Screening Criteria
Sample Event:
2023M»ySemt-
2023 Noventer
2023 November
2023 M*y Seml-
2023 November
2023 M»y Seml-
2023 November
Lab Report:
12325980
L2385119
L2364929
12325980
12365119
L2325980
L2365119
Note/Method:
8260 COCs/
8270 SIM
8260 COCs/
8270 SIM
8260 COCs
8260 COCs
8260 COCs/
8270 SIM
8260 COCs/
8270 SIM
8260 COCs/
8270 SIM
Dilution Factor:
uiuKKF rsr Criteria
CITIPH
EPAVISL
ROD
SDWA
Human
2.5/1
2/1
1
25
4/1
25/10
250/1
Action
Resld-
Com-
Cleamp
Health
GWPC
SWPC
RES V/C
I/CV/C
Level
ertial
mercial
Level
MCI.
NRWQC
Resol (0)
Result (Q)
Result (Q)
Result (Q)
Result (0)
Result (Q)
Result (Q)
PCE-TCE and Associated Breakdown Compounds
TetacMoroethene
5
88
340
310
5
28.2
123
5
5
10
1.25 U
1.00
U
0.500
U
1.25 U
200
u
125
U
125 U
Trichloroetliene
5
2,340
27
67
1
2.06
12.9
5
5
0.6
293
272
0.500
u
292
648
2960
35,400
cls-l,2-nichloroe0«iK (ds-l,2-DCE)
70
NE
NE
NE
NE
416
1,750
70
70
NE
13.7
25.8
0.500
u
1.02 J
1.58 J
328
4,110
(nuts-l,2-UlchloroetlteK (tr»as-l,2-UCK)
100
NE
NE
NE
NE
176
737
NE
100
100
220
240
0.750
u
1.88
U
3.00 U
15.2 J
232
Vinyl chloride (VC)
2
15,750
1.0
52
0.5
0.197
3.28
2
2
0.022
2.50
U
2.00
U
1.00
u
250
U
4.00 U
25.0
U
19.8 J
Remaining Method 8260 or 524.2 VOC Compounds
l,2-Dldiloroprop)iK
5
NE
7.4
53
1
11.6
50.7
5
5
0.9
2.63 J
2.56 J
1.75
u
4.38
U
7.00
u
43.8
u
438
U
Acetone
700
NE
50,000
50,000
NE
NE
NE
3,700
NE
NE
Ethmol
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
Ethylbenzene
700
530,000
50,000
50,000
NE
6.86
30
NE
700
68
1.25 U
1.00
u
0.500
u
1.25 U
200
u
125
u
125 U
m,n-Xylene
530
NE
21,300
50.000
NE
732
3,080
NE
10,000
NE
2.50
U
2.00
11
1.00
u
250
U
4.00 U
25.0
11
250 U
o-Xylene
530
NE
21,300
50.000
NE
986
4,140
NE
10,000
NE
2.50
U
2.00
u
1.00
u
250
U
4.00 U
25.0
u
250 U
Toluene
1,000
4,000,000
23,500
50.000
150
35,200
148,000
1,000
1,000
57
1.88
u
1.50
u
0.750
u
1.88
U
3.00 U
18.8
u
188
I)
1,4-Dlozane and Associated Indicator Compounc
1,4-Dloane (8270E low-level SIM)
NE
NE
NE
NE
3
5,290
23,100
NE
NE
NE
2.19
2.38
0.216
126
11.9
1,4-Dloaue (SW8260D)
NE
NE
NE
NE
3
5,290
23,100
NE
NE
NE
625 U
500 U
250 U
625 U
1,000
u
6,250
11
62500
u
1,1,1-TrfcMoroettane (TCA)
200
02,000
6,500
16,000
200
NE
NE
200
200
10,000
1,1-DlcUoroetbene (1,1-DCE)
7
90
190
920
7
297
1,250
7
7
300
1.25 U
1.00
u
0.500
u
1.25 U
200
u
125
u
43.0 J
U-nichloroeUome (1,1-DCA)
70
NE
3,000
41,000
25
12.4
54.2
NE
NE
NE
U-Tllchloroetteiie (1,2-DCA)
1
2,970
6.5
63
0.5
NE
NE
5
5
9.9
1.25 U
1.00
u
0.500
u
1.25 U
200
u
125
u
125 U
Total VOCs: 531.52
HCV/CI«
HMVBbHari
taflA IVEPAVISLin
T^Bb. V/C —JB.*J^UIEPAVTSI.WJtU JCWl!nn,4»tolfc.»Fra«>'
m »in. *¦¦¦c*o> ¦> mIbGWWDB
-------
TRC 2023 Annual
Monitoring Report
I) anion Factor
Sample Type:
I
i
i
S
!
Well Name:
CW0IDB ntTMted
flethod I2WIW270 SIM
GW0ITA M
d-Treatment
Sample Date:
02'14«02S
05/09«02S
0MJV2023
0MJV2023
10/30/2023
02'14«02S
05fl8'2fl23
0MJV2023
10/30/2023
Screening Criteria
2D23fetnaiy
2023 Mnsuy
2023 Msrjr Seni-
2023 Aagnt
2023 A^a
2023 Novmiier
2023 Fcfcnvy
2023 MaySeml-
2023 A^a
2023 Novmiier
LabKepoit:
12307954
L2307954
lis 25115
L2345941
12345941
L2 314131
L23079V4
L2325I23
12345941
L2 314V 29
oteMethod:
•210 COCl/
1270 SIM
1270 SIM
I2M COCtl
1270 SIM
12(0 COC1/
1270 SIM
1270 SIM
•210 COCl/
1270 SIM
524,2 COCl
524.2 COCl
524.Z COCl
524,2 COCl
CTOEEP BSB Criteria
cniPH
Action
level
BOD
Cleanup
Lwnd AsodMed Breakdown Comm
Twscbkiiwtfwis
II
340
110
5
212
123
5
5
10
0.500 U
0.500 U
0.500 U
0.500 U
0.50 U
0.50 U
0.50 U
0.50 U
5
ZJ40
27
•7
2.01
12,9
5
5
0.1
151
5.27
5.71
155
0.50 U
0.50 u
0.50 U
0.50 U
-------
TRC 2023 Annual
Monitoring Report
r TRC
H:\HAZl«T\lJn»TOSw\LoiiB-T»m Urrr.jTQ PngpsMLlM) RaponfctfJ TW Rgpon^g [Olrl, »v1 «mnl\T*MV0C 5urt»*y\
2
-------
TRC 2023 Annual
Monitoring Report
Loc
Wei Name:
CW14 ntreated
CW14B Mld-Tzeatment
CW14T
Treated
Sample Date:
05^9^2023
0COMO23
10/30/2023
05/09S023
0COMO23
05/09«023
0COMO23
ltW 0*2023
Screening
Cnwrta
2023 Mxsuy
2023 MsySeml-
2023 Aa^n
2023Nowmb
-------
TRC 2023 Annual
Monitoring Report
T»blB 3-4
Mdvocahi
Water Supply WeB
Loc
Wei Name:
CW40DB ntreated
CW40B MM
l-TVMtemnt
CW40T Treated
Simple Due:
05fl9'202J
0COMO23
10/30/2023
05fl9'202J
0COMO23
10/30/2023
05fl9'202J
0COMO23
10/30/2023
Screening
Crittcla
2023 tetany
2023 MsySeml-
2023 A^n
2023 Nowmt*
2023 tetany
2023 MsySeml-
2023 Al^A
2023 Nowmt*
2023 tetany
2023 MsySeml-
2023 Aa^n
2023 Nowmttr
oft/Method:
524.2 COCi
524.Z COCi
524,2 COCi
524,2 COCi
524.2 COCi
524.Z COCi
524,2 COCi
524,2 COCi
524.2 COCi
524.Z COCi
524,2 COCi
524,2 COCi
Motion Fartor:
CTDPH
SOD
Sample Type
Action
Evid-
Com-
Cleanup
Health
Lewi
ential
nurclal
Lewi
MCL
NRWQC
Healt (CI)
Bealt (Q)
Healt (Q)
PCE-TCE and Asoclated Breakdown Compos
vij
TtwcUoniKhwt
5
u
M0
110
5
123
5
5
10
0.50 u
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 u
0.50 U
0.50 U
0.50 U
5
2.340
27
«7
2.01
119
5
5
0.1
0.50 u
0.50 U
0.50 U
0J0 u
0.50 U
0.50 U
0.50 U
0J0 u
0.50 u
0.50 U
0.50 U
0.50 U
dl-l.Z-nicUrroB*m (cU-l.Z-IlCF)
70
NE
NE
NE
NE
111
1.750
70
70
NE
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
tws-l^-Dlcliloioetafie (ram-1.2-DCE)
100
NE
NE
NE
NE
17V
737
NE
100
100
0.50 u
0.50 U
0.50 U
0.50 u
0.50 u
0.50 U
0.50 U
0.50 u
0.50 u
0.50 U
0.50 U
0.50 u
Wnyidilt«Hfe(VO
2
15.750
1.1
52
0.5
0.197
3JS
Z
z
0.022
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
l^-IHcUmFrrfi»«
$
NE
7.4
51
1
UJ
50.7
$
$
0.9
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
700
50.000
50.000
3.700
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
700
5M.000
50.000
50.000
NE
IM
30
NE
700
B
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 u
0.50 U
0.50 U
0.50 U
mji-XyVne
530
NE
21.3 00
50.000
NE
732
3.010
NE
10.000
NE
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
5 JO
NE
21.3 00
50.000
NE
911
4.140
NE
10.000
NE
0.50 U
0.50 U
0.50 U
0.50 u
0.50 U
0.50 U
0.50 U
0.50 u
0.50 u
0.50 U
0.50 U
0.50 u
Tolatot
1.000
4.000.000
. :.500
50.000
150
35 ,W0
141.000
1.000
1.000
57
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
0.50 U
idf
1.4-DUrane (I270E Low-Lwel SIM)
NE
NE
NE
NE
3
5.290
23.100
NE
NE
NE
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
U-DUmn* fSWiaiUl)
3
23.100
l.l.l--McUag>t«u» CTCA)
ZOO
•2,000
U00
11.000
200
NE
NE
200
200
10.000
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
91
190
920
297
1.250
300
l.l-nuMcro atone (1.1-DCA)
70
NE
9.000
11.000
25
12.4
54J
NE
NE
NE
I^-UKWohkAsw (1.2-DCA)
1
2.970
«4
•a
0.5
9.9
r TRC
H:\HAMKT\LI reirartB^Lcre-TBi
ar\LTM> Rq»it*e\LTM> Rqwtt^ (Qbly« *™al)\2[B3WS3ftvuglflttfcAVOC SUnrnirft
-------
TRC 2023 Annual
Monitoring Report
T«Mb 3-4
Mdvocahi
Water Supply WeB
Motion Faaor:
Location Croup:
NNin:
Sample Date:
Screening Criwrl*
Sample EnM:
Domestic Winer Somriv Wei 350 Bte 171
Domestic Winer Supply Wei 371 Bte 171
CW
F3DB
CW
4DB
CW
5DB
05AJSyz0Z3
owaaozs
10/30/Z0Z3
05AJSyz0Z3
owaaozs
10/30/Z0Z3
05AJSyz0Z3
owaaozs
10/30/Z0Z3
Z0Z3 Mnuy
Z0Z3 May Seml-
Z0Z3Aapjt
Z0Z3Novemi>««u» CTCA)
ZOO
•2,000
MOO
11.000
ZOO
NE
NE
ZOO
ZOO
10.000
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
91
190
9Z0
Z97
1.Z50
300
1,1-DldiloniMfciUie (1.1-DCA)
70
NE
3.000
11.000
Z5
1Z.4
54J
NE
NE
NE
I^-UKWohkAsw (1.Z-DCA)
1
Z.970
u
•a
04
9.9
r TRC
H:\HAMKT\LI reirartB^Lcre-TBi
ar\LTM> Rq»it*e\LTM> Rqwtt^ (Qbly« *™al)\2[B3WS3ftvuglflttfcAVOC SUnrnirft
-------
TRC 2023 Annual
Monitoring Report
¦>TRC
H:\HAZMKnUrwmsrtBALor6-TBni Mmtertie PrtS'wU-T*' RqxxtWTW Rqwthe (QWy w*l hrvtyWB&ia *roal\T*led|TOC Slmrwyi
-------
TRC 2023 Annual
Monitoring Report
¦>TRC
H:\HAZMKnUrwmsrtBALor6-TBni Mmtertie PrtS'wU-T*' RqxxtWTW Rqwthe (QWy w*l hrvtyWB&ia *roal\T*led|TOC Slmrwyi
-------
TRC 2023 Annual
Monitoring Report
Table 3-4
t acted VOO hr
Domertc Water Supply Wea
IB klO rai Factor:
Sample Type:
Location Group:
WeJIName:
Sample Date:
Scrwrtnj Criteria
Sample Event
Lib Report:
CVW4
GWOIOB
GW1IDB
GW17DB
GW24DB
GW250B
GW34DB
10*3 W 023
10/31/1023
1UJ1/2023
10*3 W 023
10/31« 023
10/31/1023
10/31/1023
2023 November
Anr*jl
2023 November
Anual
2023 November
Anwl
2023 November
Anwl
2023Novemb(r
Anwl
2023 November
Anual
2023 November
Anual
I £314145
L23*4*45
L23C4937
12 314145
L2 314145
L23*4*45
L23*4*45
oMMethod:
524,2 COCl
5242 COCl
524.2 COCl
524.Z COCl
5242 COCl
5242 COCl
524.2 COCl
CTDETO BSR Criurla
CTDPH
Anion
Lwel
ROD
CUamap
I«vel
SDWA
MCL
Health
NRW)C
ReHd-
merelal
Kealt fQ)
PCE-TCE and Aimciated Biealakwn Comma
vb
5
¦
310
110
5
212
123
5
5
10
0.50 U
0.50 u
0.50 U
0.50 U
0.50 U
0.50 u
0.50 U
5
2J40
27
«7
2.01
119
5
5
0.1
0.50 u
0.50 u
0.50 U
0.50 U
0.50 u
0.50 u
0.50 U
di-l^-IBf±loi»rtiwe (ds-l.Z-IXX)
70
NE
NE
NE
NE
411
1.750
70
70
NE
0.50 U
0.50 U
0.50 U
0.50 U
0.50 u
0.50 U
0.50 U
nni-1.2-DlcU(ro (ms-U-DCE)
100
NE
NE
NE
NE
171
IT!
NE
100
100
0.50 u
0.50 u
0.50 U
0.50 U
0.50 u
0.50 u
0.50 U
Vta* Rq»it*e\LTM> Rqwtt^ (Qbly« ftvuglflttfcAVOC SUnrnirft
-------
TRC 2023 Annual
Monitoring Report
Table 3-4
Summary of Detected VOCs In Water Samples
Llnemaster Switch Corporation
2023 Annual Progress Report
Location Group:
Sv
1
1
i
1
Well Name:
SW04
SW07
SW18
Sample Date:
11AI1/2023
11AI1/2023
11/0UW23
Screening Criteria
Sample Event:
2023 November
Annual
2023 November
Annual
2023 November
Annual
12364937
12364937
12364937
Note/Method:
524.2 COCs/
8270 SIM
524.2 COCs/
8270 SIM
524.2 COCs/
8270 SIM
Dihitioi Factor:
CTDEEP RSR Criteria
CTDPH
FPA VJSI.
ROD
SDWA
Human
1
1
1
SamgleT^jje:
Action
Resid-
Com-
Cleanup
Health
Analyte
GWPC
SWPC
RES V/C
I/CV/C
Lewi
ential
mercial
Level
MCI.
NRWQC
Result (Q)
Result (Q)
Result
[Q)
PCE-TCE and Associated Breakdown Con pounds
Tetrachla-oethene
5
88
340
810
5
28.2
123
5
5
10
0.50
IJ
0.50
IJ
0.50
IJ
Trichloroethene
S
2,340
27
87
1
2.06
12.9
5
5
0.6
0.50
II
0.50
IJ
0.50
IJ
cis-l.Z-IMchliroetheiie (ch-l.Z-IXJK)
70
NE
NE
NE
NE
418
1,750
70
70
NE
0.50
U
0.50
U
0.50
U
trans-l,2-Didiloioetiiene (trans-l,2-DCE)
100
NE
NE
NE
NE
178
737
NE
100
100
0.50
IJ
0.50
IJ
0.50
IJ
Vinyl chlirfde (VQ
2
15,750
1.6
52
0.5
0.197
3.28
2
2
0.022
0.50
U
0.50
U
0.50
U
Remaining Method 8280 or 524.2 VOC Compo.
1,2-DicUonnropaiie
S
NE
7.4
58
1
11.8
50.7
5
5
0.9
0.50
U
0.50
U
0.50
U
Acetone
700
NE
50,000
50,000
NE
NE
NE
3,700
NE
NE
FihanoJ
NE
NE
NE
NE
NE
NE
NE
NE
NE
NE
RhyJberwne
700
580,000
50,000
50,000
NE
6.86
30
NE
700
68
0.50
u
0.50
u
0.50
U
m,p-Xylene
530
NE
21,300
50,000
NE
732
3,080
NE
10,000
NE
0.50
u
0.50
u
0.50
U
o-Xyiene
530
NE
21,300
50,000
NE
986
4,140
NE
10,000
NE
0.50
IJ
0.50
IJ
0.50
IJ
Toluene
1,000
4,000,000
23.500
50,000
150
35,200
148,000
1,000
1,000
57
0.50
u
0.50
u
0.50
U
1,4-Dioraie and Associated Indicator Compounds
1,4-Dioxane (8270E Low-Level SIM)
NE
NE
NE
NE
3
5,290
23.100
NE
NE
NE
0.197
0.149 J
0.306
1,4-Diutane (SW8280D)
NE
NE
NE
NE
3
5,290
23.100
NE
NE
NE
1.1.1 -Trichloroethane (TCA)
200
62,000
6,500
18,000
200
NE
NE
200
200
10,000
N/A
N/A
N/A
1.1-IJichloroettiene (1.1-DCE)
7
96
190
920
7
297
1,250
7
7
300
0.50
u
0.50
u
0.50
U
1, l-DicMdoethane (1,1-DCA)
70
NE
3.000
41,000
25
12.4
54.2
NE
NE
NE
N/A
N/A
N/A
1,2-Dichlo roe thane (1,2-DCA)
1
2,970
8.5
68
0.5
NE
NE
5
5
9.9
0.50
u
0.50
u
0.50
U
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S*mm«ry of Delected VOCs
h Sirfrce Watw Sanpfcs
-------
TRC 2023 Annual
Monitoring Report
Dilution Factor:
Sanjjle Type:
Well Name:
Sanyle
Screening Criteria DrtK
Sample Event:
BeconBcuredPlmelA
FW
-E
FW-F35
FW
-H
FV
IM
FV
MW
0SB
05/09/2023
10/30/2023
05/09/2023
10/30/2023
05/09/2023
10/30/2023
05/09/2023
lOflO/2023
05/09/2023
lOflO/2023
05/09/2023
10/30/2023
2023 May Senl-
2023 November
2023 May Seimi-
2023Novenfcer
2023 May Sei^-
2023Novenfcer
2023 May Seimi-
2023 November
2023 May Seimi-
2023 Nwenfcer
2023 May Seml-
2023Nwenber
-
L2394939
-
L2394939
-
L2394939
!
L2394939
!
L2394939
!
L2394939
Me/Meflad:
1290 COCl
1290 COCl/
1270 SIM
1290 COCl
1290 COCl/
1270 SIM
1290 COCl
1290 COCl/
1270 SIM
1290 COCl
1290 COCl/
1270 SIM
1290 COCl
1290 COCl/
1270 SIM
1290 COCl
1290 COCl/
1270 SIM
CTDEEP BSRCriteria
CTDPH
Actiui
Level
SOD
Level
SDWA
MCI.
Health
NEWQC
250
ion
l.OOffS.OOO
2.500/1
2J
2/1
4
ion
5
5/1
500
100/1
R«ld-
Con-
^^nal]rt^^^_
GWPC
SWPC
RESViC
I/CV/C
Banlt K»
Iteiit CQ)
Benlt CO)
Bern* CCD
Bern* CCD
Bttnlt CCD
tall! CO)
tail! CCD
Itenlf CO)
Bttnlt CCD
Bern* CCD
Bern* CCD
PCE-TCE and Aiiodated Breakdown Comoro
Mrachkroftfwif
S
u
340
110
i
212
123
i
5
10
59.2 J
12.3
1,100
925 J
0715 J
0529 J
9X3
12.3
1J5 J
1X1 J
250 U
SOX U
Trichln. •" nf
5
2.340
27
87
IM
12.9
5
5
0.9
21200
1,180
492,000
319,000
112
701
579
tJOO
992
901
52,000
5,990
dl-U-I)icUoroMh«it (di-U-DCE)
70
NE
NE
NE
NE
419
1,750
70
70
NE
3,120
1,100
12,700
9,220
214
193
12.0
235
27.5
24.9
91,700
11,100
Mm-l.?-I)ichliTO«hHif (Iranj-l^ nCK)
100
NE
NE
NE
NE
179
737
NE
100
100
48.0 J
15.1
750 U
1M0 U
131
9.42
1X2 J
5J7 J
3J0
5X2
152
273
Vinyl chlwlde [VC)
2
15,750
IX
52
0J
0.197
3.21
2
2
0.022
250 U
2.19 J
139 J
2,500 U
54.1
3.15
4X0 U
1J3 J
5X0 U
5X0 U
2,550
22.2 J
HfjiBlnlm Method 1290 if 524.2 VOC Cwnoour
l^-DlcUorapnuMue
5
NE
7.4
51
1
1U
50.7
5
5
0.9
431 U
17J U
1,750 U
4,310 U
4JI U
3J0 U
7X0 U
17J U
175 U
175 U
175 U
175 U
TOO
510.000
50.000
50,000
NE
9J9
30
NE
700
91
125 U
5X0 U
293 J
1,250 U
1.25 U
1X0 U
2X0 U
5X0 U
2J0 U
2J0 U
250 U
50.0 U
mj>-XyWif
530
NE
21,300
50000
NE
732
3,0*0
NE
laooo
NE
250 U
1O0 U
2,010
951 J
0.172 J
2X0 U
4X0 U
10X U
5X0 U
5X0 U
500 U
100 U
o-XyWit
530
NE
21,300
50,000
NE
9t9
4,140
NE
10,000
NE
250 U
10.0 U
413 J
2,500 U
2J0 U
2X0 U
4X0 U
10X U
5X0 U
5X0 U
500 U
100 U
Totaene
1,000
*000,000
23,500
50,000
150
35,200
141,000
1,000
1,000
57
1» U
7J0 U
1.100
5,270
1M U
lJO U
3X0 U
7J0 U
3.75 U
3.75 U
2,040
75X U
1,4-Diorare (12 TOR Low-Lewi SIM)
NE
NB
NB
NB
S
5,290
23,100
NB
NB
NB
0.277
9.77 J-
0.241
0X917 J
0.117 J
144
1,4-DtoHme (5W1290D)
NE
NE
NE
NE
S
5,290
23,100
NE
NE
NE
92,500 U
B
250000 U
B
925 U
B
1,000 U
B
1,250 U
B
125,000 U
B
UMcUomdiene 11,1-DCE)
r
99
190
920
7
297
1,250
7
7
300
125 U
U7 J
210 J
1,250 U
1.11 J
0J49 J
2X0 U
5X0 U
2J0 U
2J0 U
140 J
17.5 J
1,1-IMcWoiDfrtmie (1,1-DCA)
70
NB
3,000
41,000
25
114
542
NB
NB
NB
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
N/A
1
Total VOC«: 31,425
<>TRC
H^I*ZM*TVJr*TB8twV-tro-T«rn P>roptimV-TM> R»portliXpV™PR^*^(QW»8i^*i*«l)OT3Varo*i*
-------
Table 3-4M
Summary of Detected Metals in Water Samples
May 2021 Semi-Annual Sampling Event
Linemaster Switch Corporation
2021 Annual Progress Report
TRC 2021 Annual
Monitoring Report
Analyte:
As
Be
Cd
CAS#:
7440-38-2
7440-41-7
7440-43-9
Unit:
ug/L
ug/L
ug/L
ROD Cleanup Level:
SO
4
5
Background:
188
NE
NE
Sample
Lab
Well Name:
Date
Report
Method
Result
(Q)
Result
(Q)
Result
(Q)
Reconfigured Phase IA Extraction Wells
FW-E
05/18/2021
L2126179
SW6020B
2.2
<0.5
u
<0.2
u
FW-F35
05/18/2021
L2126179
SW6020B
27.6
<0.5
u
<0.2
u
FW-H
05/18/2021
L2126179
SW6020B
6.90
<0.5
u
0.1
J
FW-I
05/18/2021
L2126179
SW6020B
1.5
<0.5
u
<0.2
u
FW-J
05/18/2021
L2126179
SW6020B
1.0
<0.5
u
<0.2
u
MW10SB
05/18/2021
L2126179
SW6020B
449.1
<0.5
u
<0.2
u
Deep Bedrock Extraction Wells
GW10DB
05/18/2021
L2126179
SW6020B
14.8
<0.5
u
<0.2
u
MW01DB
05/18/2021
L2126179
SW6020B
4.1
<0.5
u
<0.2
u
MW06DB
05/18/2021
L2126179
SW6020B
0.S
J
<0.5
u
<0.2
u
MW14DB
05/18/2021
L2126179
SW6020B
2.7
<0.5
u
<0.2
u
MW15DB
05/18/2021
L2126179
SW6020B
7.9
1.8
0.3
MW17DB
05/18/2021
L2126179
SW6020B
1.7
<0.5
u
<0.2
u
Deep Bedrock Monitoring Wells
GW12DB
05/19/2021
L2126499
SW6020B
33.4
<0.5
u
0.9
MW11DB
05/19/2021
L2126499
SW6020B
0.4
J
<0.5
u
<0.2
u
MW12DB
05/19/2021
L2126499
SW6020B
1.9
<0.5
u
<0.2
u
MW21DB
05/20/2021
L2126794
SW6020B
3.6
<0.5
u
0.6
MW22DB
05/19/2021
L2126499
SW6020B
<0.5
U
<0.5
u
<0.2
u
MW27DB
05/19/2021
L2126499
SW6020B
0.9
<0.5
u
0.2
MW28DB
05/19/2021
L2126499
SW6020B
6.7
<0.5
u
<0.2
u
MW28DB-D
05/19/2021
L2126499
SW6020B
6.8
<0.5
u
<0.2
u
MW29DB
05/20/2021
L2126794
SW6020B
4.8
<0.5
u
<0.2
u
MW35DB
05/20/2021
L2126794
SW6020B
12.1
<0.5
u
0.1
J
Shallow Bedrock Monitoring
Wells
MW17SB
05/18/2021
L2126179
SW6020B
2S.6
<0.5
u
0.2
MW27SB
05/19/2021
L2126499
SW6020B
8.4
<0.5
u
0.1
J
Overburden Monitoring Wells
MW04T
05/20/2021
L2126794
SW6020B
26.0
<0.5
u
<0.2
u
MW06T
05/19/2021
L2126499
SW6020B
0.4
J
<0.5
u
0.7
MW11T
05/19/2021
L2126499
SW6020B
2.5
<0.5
u
0.2
MW17TS
05/18/2021
L2126179
SW6020B
0.6
<0.5
u
0.2
MW17TD
05/18/2021
L2126179
SW6020B
27.8
<0.5
u
0.2
J
MW23T
05/20/2021
L2126794
SW6020B
4.1
0.4
J
0.3
MW26T
05/20/2021
L2126794
SW6020B
23.1
<0.5
u
0.1
J
MW33T
05/20/2021
L2126794
SW6020B
28.3
<0.5
u
0.3
MWEPAATS
05/20/2021
L2126794
SW6020B
0.3
J
<0.5
u
0.1
J
MWEPAATD
05/20/2021
L2126794
SW6020B
18.1
<0.5
u
<0.2
u
Facility Potable Supply Well
GW08DB
05/18/2021
L2126179
SW6020B
2.0
<0.5
u
<0.2
u
Notes:
All results reported in micrograms per liter (jig/1).
NE: Not Established
DUP: Duplicate sample collected from this location.
Bolded value indicates constituent detected above method detection limits.
Shaded results exceed the one or more identifdied criteria.
J: The result is an estimated quantity. The associated numerical value is
the approximate concentration of the analyte in the sample.
Q: Laboratory Qualifiers.
U: Indicates not detected.
ROD: Record of Decision
Background: Background concentration determined at the time of the 1992 Remedial Investigation.
lof 1
11 *indsor-fp2\SterexI\HAZMA T\LJhemaster\Long- Term Monitoring Pmgnm\LTMP Reporting\L TMP Reporting (Qtriy andAnnua!)\2021\2021 AnnuBi\ 7Mfes|
20220303_As Summary TBbte_3-4M art 3-4N_Dmftxlsx
<>TRC
-------
Table 3-4N
Summary of Detected Arsenic in Water Samples
November 2021 Sampling Event
Linemaster Switch Corporation
Notes:
All results reported in micrograms per liter (ng/1).
NA: Not Applicable
DUP: Duplicate sample collected from this location.
Bolded value indicates constituent detected above method detection limits.
Shaded results exceed the one or more identified criteria.
J: The result is an estimated quantity. The associated numerical value is
the approximate concentration of the analyte in the sample.
Q: Laboratory Qualifiers.
U: Indicates not detected.
ROD: Record of Decision
Site-Specific Background: Background concentration determined at the time of the 1992 Remedial Investigation.
H:\HAZMAT\Unemaster\Long-Term Monitoring Program\LTMP Reportlng\LTMP Reporting (Qtrly and Annual)\2021\2021 Annual\Tables\
20220314_As Summary Table_3-4M and 3-4N_Draft.xlsx
Table 3-4-N lofl
TRC 2021 Annual
Monitoring Report
Analyte:
CAS#:
Unit:
ROD Cleanup Level:
Site-Specific Background:
Arsenic
7440-38-2
ug/L
SO
188
Well Name:
Sample
Date:
Lab
Report:
Field
pH (su)
Field
ORP(mV)
Field
Temp (°C)
Turbidity
(NTU)
Result (Q)
Shallow Bedrock Monitoring Wells
DW-01SB
11/04/2021
L2160892
7.73
-126.1
14.22
5.81
123.6
OW-OISB
11/04/2021
L2160892
7.09
-118.4
17.97
1.00
798.3
OW-04SB
11/04/2021
L2160892
7.68
-29.5
13.44
3.84
310.2
DUP-1 As
11/04/2021
L2160892
7.68
-29.5
13.44
3.84
321.3
Domestic Water Supply Wells
GW14 (Raw)
11/01/2021
L2159904
NM
NM
NM
NM
17
GW14T (Treated)
11/01/2021
L2159904
NM
NM
NM
NM
14.6
GW14 (Raw)
11/22/2021
L2164705
NM
NM
NM
NM
14.76
GW14T (Treated)
11/22/2021
L2164705
NM
NM
NM
NM
13.1
GW40DB
11/01/2021
L2159904
NM
NM
NM
NM
<5 U
GW40T
11/01/2021
L2159904
NM
NM
NM
NM
2.1
GW76DB
11/01/2021
L2159904
NM
NM
NM
NM
<5 U
GW76T
11/01/2021
L2159904
NM
NM
NM
NM
0.8 J
Field Parameter Units
pH: Standard Units (su)
ORP: Oxidation/Reduction Potential; millivolts (mV)
Temp: Temperature in degrees Celsius (°C)
Turbidity: Nephelometric Turbidity unit (NTU)
,
-------
Table 3-41
Summary of Delected Arsenic in Water Samples
2022 Sampling Events
Linemaster Switch Corporation
2022 Annual Progress Report
TRC 2022 Annual
Monitoring Report
Analyte:
Arsenic
CAS#:
7440-38-2
Unit:
ug/L
ROD Cleanup Level:
50
Site-Specific Background:
188
Sample
Lab
Analytical
Field
Field
Field
Field
WeB Name:
Date:
Report:
Method
pH (su)
ORP (mV)
Temp (°C)
Turbidity (NTU)
Result
(Q)
Reconfigured Phase I System Extraction Well
MW10SB
10/31/2022
L2260896
6020B
6.62
-78.16
16.62
3.24
465.8
Deep Bedrock Monitoring Wells
GW36DB
05/11/2022
L2225016
200.7
7.2
-8.7
11.88
0.76
<5
U
GW36DB
11/01/2022
L2261149
6020B
7.1
-14.7
12.36
0
0.6
MW12DB
05/11/2022
L2225016
200.7
7.36
-66.1
11.79
0.68
<5
u
MW12DB
11/01/2022
L2261149
6020B
7.4
-82.7
12.36
0.63
2
DUP-1 As
11/01/2022
L2261149
6020B
7.4
-82.7
12.36
0.63
2
MW18DB
05/10/2022
L2224730
200.7
8.13
10.3
12.34
0.60
5
J
MW27DB
11/02/2022
L2261503
6020B
7.59
55
12.16
8.26
1.9
MW29DB
11/02/2022
L2261503
6020B
7.68
56.1
13.04
0.02
4.4
MW35DB
11/02/2022
L2261503
6020B
7.19
67.7
14.16
8.1
7.1
Shallow Bedrock Monitoring Wells
MW12SB
2/10/2022
L2207224
6010D
6.57
116.7
9.73
18.1
3
J
MW12SB
05/11/2022
L2225016
200.7
7.34
122.2
9.39
8.07
<5
u
MW12SB
11/01/2022
L2261149
6020B
6.7
180.1
13.55
42.9
3.5
MW18SB
05/10/2022
L2224730
200.7
8.50
100.7
10.49
3.36
25
MW27SB
11/01/2022
L2261149
6020B
9.29
-122.6
11.51
17.3
9.5
MW29SB
11/02/2022
L2261503
6020B
7.37
211.2
11.03
5.4
10.4
Overburden Monitorin;
Wells
MW03T
05/11/2022
L2225016
200.7
6.23
197.5
10.02
0.20
<5
u
MW03T
11/03/2022
L2261808
6020B
7.11
96.9
12.2
10.1
0.4
J
MW04T
11/03/2022
L2261808
6020B
9.41
89.9
13.58
7.48
27.6
MW12T
2/10/2022
L2207224
6010D
6.56
110.6
7.8
3.45
16
DUP-1 AS
2/10/2022
L2207224
6010D
6.56
110.6
7.8
3.45
17
MW12T
05/11/2022
L2225016
200.7
6.38
75.5
8.99
3.05
22
DUP-1 AS
05/11/2022
L2225016
200.7
6.38
75.5
8.99
3.05
32
MW12T
11/01/2022
L2261149
6020B
6.49
204.4
14.56
14.99
22.6
MW18T
05/10/2022
L2224730
200.7
6.46
177.1
9.36
0.36
<5
u
MW26T
11/03/2022
L2261808
6020B
7.73
-121.3
16.31
11.56
36.5
MW27T
11/01/2022
L2261149
6020B
8.44
47.2
11.55
19.9
6.3
Domestic Water Supply Wells
GW14 (Raw)
10/31/2022
L2260889
200.7
N/A
N/A
N/A
N/A
24.92
DUP-1 As 200.8
10/31/2022
L2260889
200.7
N/A
N/A
N/A
N/A
26.3
GW14T (Treated)
10/31/2022
L2260889
200.7
N/A
N/A
N/A
N/A
20.9
Notes:
All results reported in micrograms per liter (jig/1).
DUP: Duplicate sample collected from this location.
Bolded value indicates constituent detected above method detection limits.
Shaded results exceed one or more of the identified criteria.
Field Parameter Units
pH: Standard Units (su)
ORP: Oxidation/Reduction Potential; millivolts (mV)
J: The result is an estimated quantity. The associated numerical value is
the approximate concentration of the analyte in the sample.
Q: Laboratory Qualifiers.
U: Indicates not detected.
ROD: Record of Decision
Site-Specific Background: Background concentration determined at the time of the 1992 Remedial Investigation.
Temp: Temperature in degrees Celsius (°C)
Turbidity: Nephelometric Turbidity Unit (NTU)
lof 1
<>T*C
-------
Table 3-4
Summary of Detected Arsenic in Water Samples
Linemaster Switch Corporation
2023 Annual Progress Report
Analyte
CAS
nit
ROD Cleanup Level
Site-Specific Background
Well Name:
Sample
Date:
Lab
Report:
Field
pH su
Field
ORP mV
Field
Temp °C
Turbidity
NT
Deep Bedrock Extraction Wells
MW14DB
02/14/2023
L2307954
6.99
200.49
10.49
7.75
MW14DB (Total)
05/01/2023
L2323552
7.24
182.10
12.90
1.26
MW14DB (Dissol
05/01/2023
L2323552
N/A
N/A
N/A
N/A
MW14DB
06/02/2023
L2330954
7.11
NM
12.40
0.91
MW14DB
08/08/2023
L2 345941
7.26
39.37
13.87
MW14DB
10/30/2023
L2364636
7.39
132.14
12.86
2.54
Reconfigured Phase 1A Extraction Wells
MW-10SB | 10/30/2023 | L2364636 | 6.89 | 188.22 | 17.17
4.03
Deep Bedrock Monitoring Wells
MW11DB
02/14/2023
L2307954
7.32
11.39
0.56
MW11DB
05/09/2023
L2325615
7.25
99.53
12.28
3.20
MW11DB
08/08/2023
L2 345941
7.43
27.89
11.43
9.26
MW11DB
10/30/2023
L2364636
7.61
130.70
11.00
3.07
MW12DB
02/15/2023
L2308162
7.49
-96.40
12.05
0.90
MW12DB
05/11/2023
L2326330
7.36
-85.13
11.91
0.00
MW12DB
08/09/2023
L2345947
7.44
-100.85
11.78
1.79
MW12DB
10/31/2023
L2364646
-179.70
11.29
2.57
MW27DB
10/31/2023
L2364646
8.34
-113.31
ll.C
13.10
MW29DB
11/01/2023
L2364929
8.04
-62.10
11.95
3.36
MW35DB
11/02/2023
L2365119
7.44
-52.30
11.71
16.10
Shallow Bedrock Monitoring Wells
MW05SB
02/15/2023
L2308162
6.11
258.10
11.22
0.65
MW05SB
05/11/2023
L2326330
6.57
219.25
12.21
2.00
MW05SB
08/08/2023
L2345941
6.12
180.27
15.38
2.52
MW05SB
10/31/2023
L2364646
6.11
143.70
10.67
1.82
MW12SB
02/14/2023
L2307954
6.99
262.00
9.69
1.03
MW12SB
05/11/2023
L2326330
7.31
55.40
10.60
8.51
MW12SB
08/08/2023
L2 345941
7.04
74.43
16.51
0.79
MW12SB
10/31/2023
L2364646
6.84
141.00
12.57
18.00
MW18SB
02/14/2023
L2307954
8.25
185.00
10.50
0.08
MW18SB
05/11/2023
L2326330
8.58
-113.70
10.80
MW18SB
08/09/2023
L2345947
8.28
-63.00
15.36
0.00
MW18SB
10/30/2023
L2364636
8.17
-84.19
12.08
0.61
MW27SB
11/01/2023
L2364929
8.48
-120.00
ll.C
1.72
MW29SB
10/31/2023
L2364646
120.40
10.28
4.15
Overburden Monitoring Wells
MW03T
02/14/2023
L2307954
6.24
236.50
9.54
0.32
MW03T
05/10/2023
L2325980
6.27
203.23
10.36
4.70
MW03T
08/09/2023
L2345947
6.37
158.59
14.26
2.17
MW03T
10/31/2023
L2364646
6.42
122.80
11.32
8.56
MW04T
11/02/2023
L2365119
10.13
11.65
5.34
MW12T
02/14/2023
L2307954
L2307954
6J8
"6.28 "
214.50
"214.50 ~
8J>8
"8.58"
0.72
0.7~2~
DUP-1 AS
02/14/2023
MW12T
05/11/2023
L2326330
L2326330
644
"6.44"
2440
" 24.40
5K90
"9.90"
6.67
"6.67"
DUP-1 AS
05/11/2023
MW12T
08/08/2023
L2345941
L2345941
}J8
5.08 "
56J58
56.58
15J39
"15.39"
0.40
0.40 "
DUP-1 AS
08/08/2023
MW12T
10/31/2023
L2364646
L2364646
6J2
"6.12"
104.26
"104.26 ~
13J62
13.62"
4.27
"4.2V"
DUP-1 As
10/31/2023
MW26T
10/30/2023
L2364636
7.51
-123.00
15.44
0.27
MW27T
11/01/2023
L2364929
8.60
-74.27
11.07
3.85
Off-site Domestic Supply Wells
GW14
10/30/2023
L2364629
L2364629
NM
~NM~
NM
~NM~
NM
~NM~
NM _
" nm"
DUP-2 200
10/30/2023
GW14T
10/30/2023
L2364629
NM
NM
NM
NM
Notes:
All results reported in micrograms per liter ( g/1).
NA: Not Applicable
NM: Not Measured
DUP: Duplicate sample collected from this location.
Bolded value indicates constituent detected above method detection limits.
Shaded results exceed the one or more identified criteria.
J: The result is an estimated uantity. The associated numerical value is
the approximate concentration of the analyte in the sample.
Q: Laboratory Qualifiers.
ROD: Record of Decision
Site-Specific Background: Background concentration determined at the time of the 1992 Remedial Investigation.
Field Parameter Units
pH: Standard Units (su)
ORP: Oxidation/Reduction Potential millivolts (mV)
Temp: Temperature in degrees Celsius ( C)
Turbidity: Nephelometric Turbidity unit (NTU)
TRC 2023 Annual
Monitoring Report
lof 1
TRC
-------
Table 3-41
Summary of January 2021 PFAS Groundwater Investigation Results
Linemaster Switch Corporation
USEPA
CT DPH
Well Name
Analyte
Health Advisory
Action Level
MW10SB
FW-E
FW-I
GW10DB
MW01DB
MWD6DB
MW14DB
Perfluorobutanesulfonic add - PFBS
NE
NE
7.3
5.5
4.0
<3.9
<3.8
<3.9
<3.7
Perfluoroheptanoic add - PFHpA
NE
70
4.7
7.3
6.5
<3.9
<3.8
<3.9
<3.7
Peril uorohexanesulfonic add - PFHxS
NE
70
13
11
18
<3.9
<3.8
<3.9
5.4
Peril uorooctanoic add - PFOA
70
70
20
35
42
<3.9
<3.8
<3.9
<3.7
Perfluorononanoic add - PFNA
NE
70
<4.0
< 4.0
<3.8
<3.9
<3.8
<3.9
<3.7
Perfluorooctanesulfonic add - PFOS
70
70
43
170
190
<3.9
<3.8
<3.9
17
SumofPFOA+PFOS
70
NE
63
205
232
-
-
-
17
Sum of PFOA,PFOS,PFNA,PFHxS and PFHpA
NE
70
80.7
223.3
256.5
-
-
-
22.4
TRC 2021 Annual
Monitoring Report
Well ID
QA/QC Samples
MWEPAATD
USEPA Health
CT DPH
DUP-1
EQUIPMENT
Analyte
Advisory
Action Level
GW08DB
MWEPAATD
537.1
MW26T
MW35DB
LAB BLANK
TRIP BLANK
BLANK
Perfluorobutanesulfonic add - PFBS
NE
NE
< 4.0
<4.0
< 4.0
12
<3.9
<4.0
<4.0
< 4.0
Perfluoroheptanoic acid - PFHpA
NE
70
< 4.0
<4.0
<4.0
8.8
<3.9
<4.0
<4.0
< 4.0
Perfluorohexanesulfonic acid - PFHxS
NE
70
< 4.0
<4.0
<4.0
25
<3.9
<4.0
< 4.0
< 4.0
Periluorooctanoic add - PFOA
70
70
< 4.0
<4.0
<4.0
42
<3.9
< 4.0
< 4.0
< 4.0
Perfluorononanoic acid - PFNA
NE
70
<4.0
< 4.0
< 4.0
< 4.0
<3.9
< 4.0
< 4.0
<4.0
Perfluorooctanesulfonic acid - PFOS
70
70
<4.0
< 4.0
<4.0
51
<3.9
< 4.0
< 4.0
<4.0
SumofPFOA+PFOS
70
NE
-
-
-
93
-
-
-
-
Sum of PFOA,PFOS,PFNA,PFHxS and PFHpA
NE
70
-
-
-
126.8
-
-
-
-
Notes:
All concentrations in nanograms/liter (ng/L), equivalent to parts per trillion (ppt)
Gray shading and bold text indicate an exceedance of a listed regulatory action level.
< # = Not detected above reporting limit
NE = Level not established or not applicable.
USEPA DWHAL: U.S. Environmental Protection Agency (USEPA) Drinking Water Health Advisory Level of 70 ng/L for PFOA and PFOS, either individually or combined
CT DPH Action Level: Connecticut Department of Public Health drinking water Action Level of 70 ng/L applicable to the sum of the concentrations of PFOA, PFOS, PFNA, PFHxS and PFHpA.
H:\HAZMAT\Linemaster\Long-Term Monitoring Program\LTMP Reporting\LTMP Reporting (Qtrly and Annual)\2021 \2021 Annual\Tables\
20220314_PFA S Table 3-41 to 3-4K Analytical Results.xlsx
Table 3-41
<>TiRC
Table 3-41
Summary of January 2021 PFAS Groundwater Investigation Results
Page 1 of 1
-------
Table 3-4J
Summary of Detected PFAS Compounds in Water Samples
Reconfigured Phase IA Extraction Wells
Linemaster Switch Corporation
2021 Annual Progress Report
TRC 2021 Annual
Monitoring Report
Reconfigured Phase IA TOP Assay Summary
Sample Location:
FW-E
FW-I
MW10SB
FW-E
FW-E
FW-I
FW-I
DUP-1 TOP
DUP-1 TOP
MW10SB
MW10SB
Screening Criteria
Sample Name:
Pre-Oxidation
Post-Oxidation
Pre-Oxidation
Post-Oxidation
Pre-Oxidation
Post-Oxidation
Pre-Oxidation
Post-Oxidation
Sample Date:
11/01/2021
11/01/2021
11/01/2021
11/01/2021
Lab Report:
L2159898
L2159898
L2159898
L2159898
Sample Type:
N
N
FD
N
USEPA
CTDPH
Analyte
CAS
Health Advisory
Action Level
Result
(0)
Result
(0)
Result
(0)
Result
(0)
Result
(0)
Result
(0)
Result
(0)
Result
(0)
Perfl uorobutanes ul fonic acid (PFBS)
375-73-5
NE
NE
4.84
4.46
2.17
2.31
2.3
2
5.03
5.71
Perfluorobutanoic acid (PFBA)
375-22-4
NE
NE
5.43
<12.4
u
2.46
<9.67
IJ
239
<9.35
U
1.64
J
<11.3
U
Perfl uorodecanes ul fonic acid (PFDS)
335-77-3
NE
NE
<1.98
u
<1.96
u
<1.90
U
<1.87
IJ
<1.95
u
<1.87
u
<1.87
U
<1.88
U
Perfl uorodecanoic acid (PFDA)
335-76-2
NE
NE
4.14
<1.96
u
2.02
1.96
1.79
J
1.4
J
<1.87
U
<1.88
u
Perfl uorododecanoi c acid (PFDoA)
307-55-1
NE
NE
<1.98
u
<1.96
u
<1.90
U
<1.87
U
<1.95
u
<1.87
u
<1.87
u
<1.88
u
Perfl uoroheptanesul foni c acid (PFHpS)
375-92-8
NE
NE
<1.98
u
4.28
5.33
6.26
5.24
4.99
2.18
2.75
Perfl uoroheptanoic acid (PFHpA)
375-85-9
NE
70
9.42
11.3
5.11
5.74
5
5.44
5.38
6.19
Perfl uorohexanes ul fonic acid (PFHxS)
355-46-4
NE
70
9.94
11.3
8.85
9.88
8.47
9.22
13.9
16.9
Perfluorohexanoic acid (PFHxA)
307-24-4
NE
NE
<1.98
u
17.1
5.34
7.57
5.2
6.88
<1.87
u
10.6
Perfl uorononanesul fonic Acid (PFNS)
68259-12-1
NE
NE
<1.98
u
<1.96
u
<1.90
u
<1.87
U
<1.95
u
<1.87
u
<1.87
u
< 1.88
u
Perfluorononanoic acid (PFNA)
375-95-1
NE
70
11.4
6.02
2.58
2.35
2.34
2.19
J
0.704
J
0.834
J
Perfl uorooctanoic acid (PFOA)
335-67-1
70
70
61.2
68.4
37.4
46.5
36.2
36
28.1
32.8
Perfl uorooctanesul fonic acid (PFOS)
1763-23-1
70
70
212
170
225
284
217
222
37.3
49.4
Perfluoropentanesul fonic Acid (PFPeS)
2706-91-4
NE
NE
1.94
J
2.06
1J1
J
1.4
J
1.26
J
1.14
J
4.15
4.58
Perfl uoropentanoic acid (PFPeA)
2706-90-3
NE
NE
11.5
14
5.05
6.48
4.76
5.93
4.58
7.07
Perfluorotetradecanoic acid (PFTeA)
376-06-7
NE
NE
<1.98
u
<1.96
UJ
<1.90
u
<1.87
UJ
<1.95
u
<1.87
UJ
<1.87
UJ
<1.88
u
Perfl uorotridecanoic acid (PFTriA)
72629-94-8
NE
NE
<1.98
u
<1.96
u
<1.90
u
<1.87
u
<1.95
u
<1.87
u
<1.87
u
<1.88
u
Perfl uoroundecanoi c acid (PFUnA)
2058-94-8
NE
NE
0.672
J
<1.96
u
<1.90
u
<1.87
u
<1.95
u
<1.87
u
<1.87
u
<1.88
u
Sum of PFOA + PFOS
70
NE
273.2
238.4
262.4
330.5
253.2
258
65.4
82.2
Sum of PFOA, PFOS, PFNA, PFHxS + PFHpA
NE
70
303.96
267.02
278.94
348.47
269.01
274.85
85.384
106.124
Notes:
All results reported in nanograms per liter (ng/1).
re method detection limits.
criteria, MCI or action level
Q: Laboratory Qualifiers
U: Indicates not detected.
ited numerical value is the approximate concentration of the analyte in the sample,
Agency (USEPA) Drinking Water Health Advisory Level of 70 ng/L for PFOA and PFOS, either individually or combined
of Public Health drinking water Action Level of 70 ng/L applicable to the sum of the concentrations of PFOA, PFOS, PFNA, PFHxS and PFHpA.
TOP Assay; Total Oxidizable Precusors Assay Analysis
<>TRC
\\wlndsor-fp2\Shared\HAZMATV-lnefnasterV-ong-Term Monitoring Program\LTMP Report lng\LTMP Reporting (Qtrly andAnnual)\2021\2021Annual\Tables\
20220303_PFAS Table 3-41 to 3-4KAnalytltal Results.xlsx
Table 3-4J
Table 3-4J
Summary of Detected PFAS Compounds
in Reconfigured Phase IA Samples
Page 1 of 1
-------
Table 3-4K
Summary of Detected PFAS Compounds in Water Samples
Deep Bedrock IRTS Extraction/Monitoring Wells
Linemaster Switch Corporation
2021 Annual Progress Report
TRC 2021 Annual
Monitoring Report
Sample Location:
GW36DB
MW08DB
MW14DB
MW27DB
Sample Name:
GW36DB
MW08DB
MW14DB
MW27DB
Screening Criteria
Sample Date:
11/02/2021
11/02/2021
11/01/2021
11/02/2021
Lab Report:
L2160160
L2160160
L2159898
L2160160
Sample Type:
N
N
N
N
USEPA
CT DPH
Analyte
CAS
DWHAL
Action Level
Result
CO)
Result
CO)
Result
CO)
Result
CO)
Perfluorobutanesulfonic acid (PFBS)
375-73-5
NE
NE
<1.82
U
< 1.81
U
0.946
J
< 1.82
U
Perfluoroheptanoic acid (PFHpA)
375-85-9
NE
70
<1.82
U
< 1.81
U
0.867
J
< 1.82
U
Perfluorohexanesulfonic acid (PFHxS)
355-46-4
NE
70
<1.82
U
< 1.81
U
6.22
J
< 1.82
U
Perfluorononanoic acid fPFNA)
375-95-1
NE
70
<1.82
U
< 1.81
U
<1.97
UJ
<1.82
u
Perfluorooctanoic acid (PFOA)
335-67-1
70
70
<1.82
U
< 1.81
U
1.93
J
< 1.82
u
Perfluorooctane sulfonic acid (PFOS)
1763-23-1
70
70
<1.82
u
< 1.81
U
8.59
J
< 1.82
u
Sum ofPFOA +PFOS
70
NE
ND
ND
10.52
ND
Sum of PFOA, PFOS, PFNA, PFHxS + PFHpA
NE
70
ND
ND
17.607
ND
Notes:
All results reported in nanograms per liter (ng/1).
Bolded value indicates constituent detected above method detection limits. Q: Laboratory Qualifiers
Shaded results exceed one or more identified criteria, MCL or action level. |lJ: Indicates not detected.
< #: Not detected above reporting limit UJ: Estimated non-detect.
J: The result is an estimated quantity. The associated numerical value is the approximate concentration of the analyte in the sampl e.
NE: No Criteria Established
USEPA DWHAL: U.S. Environmental Protection Agency (USEP A) Drinking Water Health Advisory Level of 70 ng/L for PFOA and PFOS, either individually or combined
CT DPH Action Level: Connecticut Department of Public Health drinking water Action Level of 70 ng/L applicable to the sum of the concentrations of PFOA, PFOS, PFNA, PFHxS and PFHpA.
A
.
\\windsor-fp2\Shared\HAZMAT\Linemaster\Long-Term Monitoring Program\LTMP Reporting\LTMP Reporting (Qtrly and Annual)\2021\2021 AnnuaI\Tables\
20220303_PFA5 Table 3-41 to 3-4K Analytical Results.xlsx
Table 3-4K
Table 3-4K
Summary of Detected PFAS Compounds
in Deep Bedrock Well Samples
Page 1 of 1
-------
Table 3-4L
Summary of Detected PFAS Compounds in Water Samples
Domestic/Potable Water Supply Wells
Linemaster Switch Corporation
2021 Annual Progress Report
TRC 2021 Annual
Monitoring Report
Domestic Water Supply Well
Potable Water Supply Well
Domestic Water Supply Well
Sample Location:
(7 Millbrook Lane)
(Woodstock Town Hall)
(10 Millbrook Lane)
Screening Criteria
Sample Name:
GW14
(Untreated)
GW14T
(Treated)
GW40DB
(Untreated)
GW40T
(Treated)
GW76DB
(Untreated)
GW76T
(Treated)
Sample Date:
11/01/2021
11/01/2021
11/01/2021
11/01/2021
11/01/2021
11/01/2021
Lab Report:
L2159904
L2159904
L2159904
L2159904
L2159904
L2159904
Sample Type:
N
N
N
N
N
N
USEPA
CT DPH
Analyte
CAS
DWHAL
Action Level
Result
(0)
Result
(0)
Result
fO)
Result
(0)
Result
(0)
Result
(0)
Perfluorobutanesulfonic acid (PFBS)
375-73-5
NE
NE
<1.91
U
< 1.82
U
<1.90
U
<1.86
U
<1.84
U
<1.77
U
Perfluoroheptanoic acid (PFHpA)
375-85-9
NE
70
<1.91
U
< 1.82
U
<1.90
U
<1.86
U
<1.84
U
<1.77
U
Perfluorohexanesulfonic acid (PFHxS)
355-46-4
NE
70
<1.91
U
<1.82
u
1.21
J
<1.86
u
<1.84
U
<1.77
U
Perfluorononanoic acid (PFNA)
375-95-1
NE
70
<1.91
u
< 1.82
u
<1.90
u
<1.86
u
<1.84
u
<1.77
U
Perfluorooctanoic acid (PFOA)
335-67-1
70
70
<1.91
u
<1.82
u
1.86
J
<1.86
u
<1.84
u
<1.77
u
Perfluorooctanesulfonic acid (PFOS)
1763-23-1
70
70
<1.91
u
<1.82
u
0.911
J
<1.86
u
<1.84
u
<1.77
u
Sum ofPFOA +PFOS
70
NE
ND
ND
2.771
ND
ND
ND
Sum of PFOA PFOS, PFNA, PFHxS + PFHpA
NE
70
ND
ND
3.981
ND
ND
ND
Notes:
All results reported in nanograms per liter (ng/1).
BokJed value indicates constituent detected above method detection limits. Q: Laboratory Qualifiers
Shaded results exceed one or more identified criteria, MCI. or action level | U: Indicates not detected.
< #: Not detected above reporting limit
J: The result is an estimated quantity. The associated numerical value is the approximate concentration of the analyte in the sample.
NE: No Criteria Established
USEPA DWHAL; U.S. Environmental Protection Agency (USEPA) Drinking Water Health Advisory Level of 70 ng/L for PFOA and PFOS, either individually or combined
CT DPH Action Level: Connecticut Department of Public Health drinking water Action Level of 70 ng/L applicable to the sum of the concentrations of PFOA, PFOS, PFNA, PFHxS and PFHpA.
A
\\w(ndsor-fp2\shared\HAZMAT\Unemaster\Long-Term Monitoring Program\LTMP Reportlng\LTMP Reporting (Qtrly and Annual)\2021\2021 AnnuaI\Tables\
20220303_PFAS Table 341 to 34K Analytical Results.xlsx
Table 34L
Table 3-4L
Summary of Detected PFAS Compounds
in Domestic Water Supply Well Samples
Page 1 of 1
-------
Table 3-4
Summary of Detected P AS Compounds In Water Samples
Llnemaster Switch Corporation
2023 Annual Progress Report
TRC 2023 Annual
Monitoring Report
Reconfigured Phase IA Extraction Welb
Sample Location
FW-E
FW-I
MW10SB
Sample Name
FW-E
D P-1537M
FW-E
D P-l 537.1
FW-E
D P-1537M
FW-I
FW-I
FW-I
MW-10SB
MW-10SB
MW-10SB
Screening Criteria
Sample Date
05/09/2023
05/09/2023
08/08/2023
08/08/2023
10/30/2023
10/302023
05/09/2023
08/08/2023
10/30/2023
05/09/2023
08138/2023
10/30/2023
Lab Repot
L2325615
L2325615
L2345941
L2345941
12364636
12364636
12325615
12345941
12364636
12325615
12345941
12364636
Sample Type
N
FT)
N
FT)
N
FT)
N
N
N
N
N
N
Analyte
CAS
SFPA
DWHAL
SWA
Proposed
MCL
CTDPH
Actioi Level
Result (Q)
Result (Q)
Result (Q)
Result (Q)
Result (Q)
Result (Q)
Result (Q)
Result (Q)
Result (Q)
Result (Q)
Result (Q]
Result (Q)
Pwftiorobutanesulfbiiic add (PFBS)
375-73-5
2,000
NE
760
PerfliHnJieptanolc acid (PFHpA]
375-85-9
NE
NE
NE
13.4
12
8.86
10.2
7.64 J
7.42 J
7.8
5.65
5.41 J
5.76
8.67
7.32 J
PerflmnJiewniwul add fPFHxSl
355-46-4
NE
NE
49
11.4
10.9
4.48
4.3
7.67 J
7.18 J
14.3
9.2
9.42
18.2
10.3
10.3
PerfluirwioTiaTioic add fPFNAl
375-95-1
NE
NE
12
5.95
494
2.82
2.49 J
4.14 J
3.71 J
4.39
2.73 J
1.74 J
0.488 JF
3.92 J
3.94
Peifluirooctaiidc add (PTOA1
335-67-1
0.004
4
16
Perfluirooctaiiesulfbnic add (PFOS)
1763-23-1
0.02
4
10
147
123
66.7
49.8
185 J
155 J
242
307
219
40.9
125
166
Sum of PFAS: 236.52 208.67 105.35 85.15 247.13 213.82 322.94 361.6 275.71 104 458 190.9 236.24
None
N:N««in»l
<>TRC
H;\HAZMATVin«miwt«\UH*-Twm Monitoring Program\LTMP RflportlnsVLTMP R«portinB(CltHyiind Anr*jalJ\2C23\2023 Annuiil\Tiibl«\0I_Tiiblw Rwdyfor ltotfflw\RwiflwCofnplfltfl\
Tabla &4J_T HU Summary Tabb_.2in303l7.idH
pageic#2
-------
Table 3-4
Summary of Detected P AS Compounds In Water Samples
Llnemaster Switch Corporation
2023 Annual Progress Report
TRC 2023 Annual
Monitoring Report
IRTS
Monitwing Well
IRTS
Extractiui Well
Sample Location
MW28T
MW14DB
Sample Name
MW28T
MW28T
MW28T
MW14DB
MW14DB
MW14DB
Screening Criteria
Sample Date
05/09/2023
08AJ8/2023
10/30/2023
06/02/2023
08/08/2023
10/30/2023
Lab Repot
L2325815
12345941
12384838
12330954
12345941
12384838
Sample Type
N
N
N
N
N
N
Analyte
CAS
SFPA
DWHAL
SWA
Proposed
MCL
CTDPH
Actioi Level
Result (Q)
Result (Q)
Result (Q)
Result (Q)
Result (Q)
Result (Q)
Peiflunobutanesulfbiiic add (PFBS)
37S-73-S
2,000
NE
780
9.12
0.845 J
1.88 U
0.852 J
PerfliHnJieptanolc acid (PFHpA]
375-85-9
NE
NE
NE
10.2
9.31
10.3
0.898 J
0.889 J
0.723 J
PerflmnJiewniwul add fPFHxSl
355-48-4
NE
NE
49
23.8
28.5
24.9
4.22
4.09
3.97 J-
PerfluirwioTiaTioic add fPFNAl
375-95-1
NE
NE
12
1.21 J
1.2 J
0.538 J
1.90 U
1.88 U
1.88 U
Perfluirooctaiidc add (PTOA1
335-87-1
0.004
4
18
111
9.44
1.8 J
1.79 J
Perfluirooctaiiesulfbnic add (PFOS)
1783-23-1
0.02
4
10
39.8
38.3
45.1 J
1.78 J
7.17
8.84
SumofPFAS: 194.93 135.53 147.988 18.783 13.529 1S.77S
None
N:N««in»l
rn: Iltii DtpXau
<>TRC
H;\HAZMATVin«miwt«\UH*-Twm Monitoring Program\LTMP RflportlnsVLTMP R«portinB(CltHyiind Anr*jalJ\2C23\2023 Annuiil\Tiibl«\OI_Tiiblw Roadyfor ltotfflw\RwiflwCofnplfltfl\
Tabla &4J_T HU Summary Tabb_.2in303l7.idH
page 2 c# 2
-------
OSWER No. 9355.7-03B-P
Appendix B.3
Charts
D-l
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
GW08DB
Historical TCE and Total VOC Concentrations
Linemaster Switch Corporation
O
S 6,000
4,000
2,000
12,000
June 1992
IRTS Operation
Begins
Date
10,000
Total VOCs —•—TCE
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
GW08DB
Historical TCE and Total VOC Concentrations - Past Five Years
Linemaster Switch Corportation
Date
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
GW10DB
Historical TCE and Total VOC Concentrations
Linemaster Switch Coiporation
60,000
Oj" ^ $• ft ft
3 of 36
<>TRC
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
8,000
7,000
1,000
GW10DB
Historical TCE and Total VOC Concentrations - Past Five Years
Linemaster Switch Corporation
jP jy jy
JT of* & ef ^
Date
4 of 36
<>TRC
-------
IRA System Wells
Concentration VS Time Plots
GW12DB
Historical TCE and Total VOC Concentrations
Linemaster Switch Corporation
June 1992 r
IRTS Operation
Begins
Date
TRC 2023 Annual
Monitoring Report
5 of 36
<>TRC
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
GW12DB
Historical TCE and Total VOC Concentrations - Past Five Years
Linemaster Switch Corporation
Date
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
June 1992
IRTS Operation
Begins
GW36DB
Historical TCE and Total VOC Concentrations
Linemaster Switch Corporation
70
O)
a.
60
50
40
c
o
o 30
o
O
20
10
-Total VOCs
TCE
A
0>N ^ oj* $ cj
^ ^ # /¦
SbN jS1, S? J?
^
S? \N v3 J? & £ ^ j) ^ ;p>
^ ^ # # -s^ ^ ^ ^ ^ ^ ^ ^ ^
Date
7 of 36
<>TRC
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
MW01DB
Historical TCE and Total VOC Concentrations
Linemaster Switch Corporation
250
200
$8* & 5^
S>N & <& & & & <& sP & ,\° ,\N .<1- «?>
•$> &
3^' ^ ^ ^ ^ ^ ^ ^ ^ -j^'
Date
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
MW01DB
Historical TCE and Total VOC Concentrations - Past Five Years
Linemaster Switch Corporation
70
Date
-------
IRA System Wells
Concentration VS Time Plots
MW06DB
Historical TCE and Total VOC Concentrations
June 1992 Linemaster Switch Corporation
IRTS Operation
Begins
Date
TRC 2023 Annual
Monitoring Report
10 of 36
<>TRC
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
MW06DB
Historical TCE and Total VOC Concentrations - Past Five Years
Llnemaster Switch Coiporatlon
Date
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
June 1992
IRTS Operation
Begins
MW14DB
Historical TCE and Total VOC Concentrations
Linemaster Switch Corporation
700
600
500
O)
3 400
c
o
c
o
o
c
o
o
300
200
100
-Total VOCs
TCE
L
iiiSkuhh
°>N ,#• ft ft ft $ ft ft ft J5n s?' ft
^ ^ ^
^
ft J
$ jS> s?
^ ^ ^
Date
$$•' ¦s$"' ^ ^ ^ ^ •j#''
^ & & ft
¦sS>' ^ •jS"'
12 of 36
<>TRC
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
Total VOCs
2,000
June 1992
IRTS Operation
Begins
MW15DB
Historical TCE and Total VOC Concentrations
Linemaster Switch Corporation
2,500
O)
=L 1,500
Date
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
MW15DB
Historical and Total VOC Concentrations - Past Five Years
Linemaster Switch Corporation
Date
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
June 1992
IRTS Operation
Begins
MW17DB
Historical TCE and Total VOC Concentrations
Linemaster Switch Corporation
16,000
14,000
12,000
O) 10,000
3
c
o
& 8,000
+*
c
o
o
c
o
o 6,000
4,000
2,000
-Total VOCs
TCE
"» »|. I., ,n f\
°>NsJ's£
i mt»>
# # # # # ^ #
«.* ^ ^ -aO
N* ^ ^
s?> s§
„•$> »•?
N0 TRC
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
MW17DB
Historical TCE and Total VOC Concentrations - Past Five Years
Llnemaster Switch Coiporatlon
Date
-------
IRA System Wells
Concentration VS Time Plots
MW21DB
Historical TCE and Total VOC Concentrations
June 1992 Linemaster Switch Corporation
IRTS Operation
Begins
1
1
1
1
1
1
1
1
1
1
1
Total VOCs —•—TCE
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1,
1
1
1
I'
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
I
^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^ ^
Date
TRC 2023 Annual
Monitoring Report
17 of 36
<>TRC
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
MW21DB
Historical TCE and Total Concentrations - Past Five Years
Llnemaster Switch Corporation
Date
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
MW28DB
Historical TCE and Total VOC Concentrations
Linemaster Switch Corporation
2,250 i
2,000
$>y dp $
, „ rr ,
vvSO ,vS<> ^ ^ ,v\0 vvSO vv<> vO*> vO$> vv\0 vvSO vv<> vO*> vO$> v0*> vvSO
* ^
^ -jS-- NjS-- ^ ^ ^
Date
19 of 36
<>TRC
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
MW28DB
Recent TCE and Total VOC Concentrations - Past Five Years
Linemaster Switch Corporation
Date
-------
IRA System Wells
Concentration VS Time Plots
MW35DB
Recent TCE and Total VOC Concentrations - Past Five Years
Linemaster Switch Corporation
Date
TRC 2023 Annual
Monitoring Report
21 of 36
<>TRC
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
MW35DB
Historical TCE and Total VOC Concentrations
Linemaster Switch Corporation
Date
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
June 1992
IRTS Operation
Begins
MW15SB
Historical TCE and Total VOC Concentrations
Linemaster Switch Corporation
6,000
4,000
J*
I
c
o
^ 3,000
2,000
Date
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
June 1992
IRTS Operation
Begins
MW17SB
Historical TCE and Total VOC Concentrations
Linemaster Switch Corporation
700
Date
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
June 1992
IRTS Operation
Begins
MWEPAASB
Historical TCE and Total VOC Concentrations
Linemaster Switch Corporation
3,500 -i
3,000
2,500
2,000
c
o
*•>
c
g 1,500
c
o
o
1,000
500
Total VOCs —•—TCE
/ ,
/
/y
q>^ cp'
J? & 5? & J?
^ v0<> ^ 4
5^ ,
& j?
vv^'
Date
25 of 36
<>TRC
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
MW04T
Historical TCE and Total VOC Concentrations
June 1992 Line master Switch Corporation
IRTS Operation
Begins
Date
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
June 1992
IRTS Operation
Begins
300
MW17TD
Historical TCE and Total VOC Concentrations
Linemaster Switch Coiporation
27 of 36
<>TRC
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
MW26T
Historical TCE and Total VOC Concentrations
Linemaster Switch Corporation
6,000,000
-Total VOCs
TCE
Jy v5 ^ >$> »?> rji
Date
28 of 36
<>TRC
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
MW26T
Historical TCE and Total VOC Concentrations - Past Five Years
Linemaster Switch Corporation
Date
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
7,000
6,000
5,000
June 1992
IRTS Operation
Begins
MW33T
Historical TCE and Total VOC Concentrations
Linemaster Switch Coiporation
2
c 4,000
o
c
o
g 3,000
o
O
2,000
1,000
-Total VOCs
/ # & #
^ ^ ^ ^ ^
$ sP >N & & & & & & & !? rP & $y $
# # # ^ ^ # # # # # # # # # # # #
Date
30 of 36
<>TRC
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
120,000
100,000
80,000
June 1992
IRTS Operation
Begins
MWEPAATS
Historical TCE and Total VOC Concentrations
Linemaster Switch Corporation
o)
a.
2 60,000
++
C
O
o
c
o
O
40,000
20,000
-Total VOCs
TCE
^ ^
^ vv^' ^ ^ ^ ^ ^
\N &
^
Date
31 of 36
<>TRC
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
MWEPAATS
Historical TCE and Total VOC Concentrations - Past Five Years
Linemaster Switch Corpration
Date
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
June 1992
IRTS Operation
Begins
MWEPAATD
Historical TCE and Total VOC Concentrations
Linemaster Switch Corporation
60,000
50,000
40,000
2 30,000
++
c
O
O
C
o
O
20,000
10,000
Date
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
MWEPAATS, MWEPAATD and MWEPAASB
Historical TCE and Total VOC Concentrations
Linemaster Switch Corporation
120,000
^ vv-S* v^1 ^ ^ vv-f1 v^1 v^1
A A A A A A A A rQ,
^ v^1 v^1 ^ ^ v^1 v^1 ^ ^
Date
34 of 36
<>TRC
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
Total VOCs —¦—TCE —cis-1,2-DCE
GW14
Recent TCE, cis-1,2-DCE and Total VOC Concentrations
Linemaster Switch Corporation
90.0
Date
-------
IRA System Wells
Concentration VS Time Plots
TRC 2023 Annual
Monitoring Report
GW76DB
Recent TCE, cis-1,2-DCE and Total VOC Concentrations (Since November 2014)
Linemaster Switch Corporation
Date
-------
Reconfigured Phase 1A Area
Extraction Wells Concentration
VS Time Plots
TRC 2023 Annual
Monitoring Report
FW-F35
Historical TCE and Total VOC Concentrations
Linemaster Switch Corporation
Date
1 of 10
<>TRC
-------
Reconfigured Phase 1A Area
Extraction Wells Concentration
VS Time Plots
TRC 2023 Annual
Monitoring Report
FW-E
Historical TCE and Total VOC Concentrations
Linemaster Switch Corporation
Date
2 of 10
<>TRC
-------
Reconfigured Phase 1A Area
Extraction Wells Concentration
VS Time Plots
TRC 2023 Annual
Monitoring Report
FW-H
Historical TCE and Total VOC Concentrations
Linemaster Switch Corporation
Date
3 of 10
<>TRC
-------
Reconfigured Phase 1A Area
Extraction Wells Concentration
VS Time Plots
TRC 2023 Annual
Monitoring Report
FW-H
Historical TCE and Total VOC Concentrations - Past Five Years
Linemaster Switch Corporation
1,200.000
Date
4 of 10
<>TRC
-------
Reconfigured Phase 1A Area
Extraction Wells Concentration
VS Time Plots
TRC 2023 Annual
Monitoring Report
FW-I
Historical TCE and Total VOC Concentrations
Linemaster Switch Corporation
Date
5 of 10
<>TRC
-------
Reconfigured Phase 1A Area
Extraction Wells Concentration
VS Time Plots
TRC 2023 Annual
Monitoring Report
FW-I
Historical TCE and Total VOC Concentrations Past Five Years
Linemaster Switch Corporation
Date
6 of 10
<>TRC
-------
Reconfigured Phase 1A Area
Extraction Wells Concentration
VS Time Plots
TRC 2023 Annual
Monitoring Report
FW-J
Historical TCE and Total VOC Concentrations
Linemaster Switch Corporation
300,000
250,000
200,000
April 1998
Phase 1A Operation
Begins
-Total VOCs
o)
A
C
O
2 150,000
c
o
o
c
o
O
100,000
50,000
&&&&&&&&&&&&
TRC
-------
Reconfigured Phase 1A Area
Extraction Wells Concentration
VS Time Plots
TRC 2023 Annual
Monitoring Report
FW-J
Historical TCE and Total VOC Concentrations - Past Five Years
Linemaster Switch Corporation
Date
8 of 10
<>TRC
-------
Reconfigured Phase 1A Area
Extraction Wells Concentration
VS Time Plots
TRC 2023 Annual
Monitoring Report
MW10SB
Historical TCE and Total VOC Concentrations
Linemaster Switch Corporation
600,000
500,000
400,000
1
c
o
2 300,000
++
c
a
o
c
o
O
200,000
100,000
5*> J* J*
Date
9 of 10
<>TRC
-------
Reconfigured Phase 1A Area
Extraction Wells Concentration
VS Time Plots
TRC 2023 Annual
Monitoring Report
MW10SB
Historical TCE and Total VOC Concentrations - Past Five Years
Linemaster Switch Corporation
Date
10 of 10
<>TRC
-------
Appendix C
Interviews
-------
INTERVIEW
RECORD
Site Name: Linemaster Switch
EPA ID No.:
Subject: Five Year Review
Time: 11 AM Date:
5/22/2024
Type: ^Telephone ~ Visit ¦ Other
Location of Visit: Diane Stallings provided written responses to these
questions and submitted them via email on May 22, 2024.
~ Incoming ~ Outgoing
Contact Made By:
Name:
Ashley James (EPA ESO Contractor)
Title:
Project Coordinator
Organization:
Sanborn Head & Associates
Individual Contacted:
Name: Diane Stallings
Title:
PRP Contractor
(TRC)
Organization: TRC
Telephone No: 978-656-3587
Fax No: N/A
E-Mail Address: dstallings@trccompanies.com
Street Address:
1. What is your overall impression of the project and site?
Response: The deep bedrock groundwater pump & treat system (the Interim Removal Action or IRA) has
been operating at the site for 32 years. The system has achieved significant reductions in groundwater
volatile organic compound (VOC) contaminant levels, although two off-site domestic water supply wells
have been impacted in recent years. A source area treatment system consisting of dual vacuum extraction
(DVE) became operational in December 1998. Operation of the vacuum extraction portion of the source
area treatment remedy was hampered by the existing geological conditions. After additional studies, the
vacuum extraction portion of the remedy was determined to be ineffective and, with USEPA's approval,
ceased operation in 2003. The groundwater extraction portion of the source area remedy (referred to as
the Phase 1A Area remedy) continues to operate and, with the replacement of extraction pumps in 2016,
Phase 1A area annual total VOC mass removal has increased more than tenfold. However, it will be
difficult to achieve current soil and groundwater remedial goals without addressing remaining source
area impacts. Source control and management of migration actions were evaluated in the 2023 Focused
Feasibility Studies (FFSs), with a goal of achieving a site cleanup in a timely fashion that protects the
public and the environment and is acceptable to USEPA, the State of Connecticut and Linemaster
Corporation.
2. Are you aware of any issues the five-year review should focus on?
Response: The current performance ofFFS for source control and management of migration to
determine the most cost-effective means of resolving remaining contaminant issues while protecting the
public and the
environment.
3. Is the remedy functioning as expected?
Response: With the exception of the detection of several site contaminants of concern (COCs) in two off-
site domestic water supply wells, the groundwater extraction and treatment system is functioning as
-------
expected. As noted in the response to #8, below, Linemaster has supplied point of service treatment
systems at these properties.
4. Do you have any comments or suggestions regarding the site's
management or operation?
Response: The site's remedial systems are well operated. Discharges from the treatment system meet
applicable discharge criteria.
5. Are you aware of any community concerns regarding the site or its operation and
administration?
Response: No.
6. Have there been any changes in the site or surrounding property in the last 5 years, or are
changes planned?
Response: Linemaster is in the process of reconfiguring the existing Interim Remedial Treatment System
(ITRS) extraction well MW14DB discharge from the ITRS to the existing potable water treatment system
and reconfiguring the current facility potable well (GW08DB) from the potable water treatment system to
the IRTS. The majority of the well reconfiguration was completed in 2023 but supply chain issues with
several plumbing parts have delayed the completion of the reconfiguration effort.
7. Have there been any complaints or incidents that required a response
by your team?
Response: There have not been any off-site complaints or incidents that have required a response. TRC
has assisted Linemaster in addressing on-site issues normally associated with the operation and
maintenance of pump-and-treat systems.
8. What effects have site operations had on the surrounding community?
Response: The on-site remedial operations do not affect the surrounding community. The two impacted
domestic water supply wells have been fitted with treatment systems, which are maintained by
Linemaster, and the water is monitored on a quarterly basis.
9. Do you feel well informed about the site's activities and progress?
Response: Yes.
10. Please describe the continuous onsite O&M presence, including personnel and activities. Also,
describe on-site presence of Linemaster personnel and frequency of site inspections and activities.
Response: The Linemaster facility is an active, operating facility and O&M is performed primarily by
on-site personnel, with the assistance of environmental consultants and subcontractors, as needed. The
pump-and-treat system requires minimal operator involvement. Weekly inspections and data gathering
are performed by Linemaster personnel. Replacement parts of critical components are stored on-site to
minimize any operational shutdowns due to equipment failure.
11. Please summarize any changes in the O&M requirements, maintenance schedules, or sampling
routines since start-up and any changes that have occurred within the last five years. How do they
affect the protectiveness or effectiveness of the remedy? Please describe changes and impacts.
Response: There have been no significant changes in O&M requirements or maintenance schedules in
the last five years. Changes to the scope of the sampling program are described in the annual reports and
include the following modifications made since 2019:
• As part of the FFS development, EPA determined that the Human Health Risk Assessment
(HHRA) required an update. The HHRA was submitted to EPA in 2021. At this time EPA agreed
-------
to a reduction of routinely monitored CVOCs and consisted of only contaminants that were
detected
above drinking water standards in recent years and the original COCs.
• In January 2021, at the request ofEPA, 11 wells were sampled for 6 PFAS compounds required
to be analyzed in water supply systems under the Safe Drinking Water Act's Unregulated
Contaminant Monitoring Rule (UCMR). PFAS detections were identified in four source area
wells and MW14DB, and exceedances of action levels were identified in three till wells and one
shallow bedrock well in the source area.
• In November 2021, groundwater samples were collected for TOP assay analysis (for the January
2021 PFAS analyte list) from three source area wells included in the January 2021 sampling, as
these wells are located in the source area and could be impacted by certain in situ remedial
actions. In addition, samples were collected from MW14DB, sentinel wells MW08DB, MW27DB,
and GW36DB and potable wells GW14, GW40DB and GW76DB (wells with treatment systems)
and submitted for PFAS analysis. The TOP assay indicated only slight increases in the detected
concentrations and, in some cases, reductions in concentrations were observed following
oxidation. The results indicated the following:
o Criteria were exceeded in source area wells
o Results from all sentinel wells reported non-detect values for PFAS
o For potable wells, only one detection of PFAS was detected in untreated sample from
town hall; however, the results from the treated sample reported non-detect.
• On November 3, 2022, USEPA submitted a letter to Linemaster directing that additional arsenic
data be collected using current sampling methods to support the establishment of an updated
background concentration for arsenic. These data will provide a baseline that will be used as a
benchmark to evaluate arsenic concentrations at the Site as a result of site remediation actions. This
testing is ongoing with the collection of a minimum of 10 rounds of sampling data to be collected. To
date, seven rounds of arsenic sampling have been completed. At the conclusion of this study a statistical
analysis will be conducted to update the arsenic background concentration and provide additional data
to assess seasonal variations in arsenic concentrations at the site.
12. Have there been any opportunities to optimize O&M or sampling efforts? Please describe
changes and resulting or desired cost savings or improved efficiencies.
Response: Each annual report includes recommendations for changes to the scope of the sampling
program, which have been implemented to optimize the sampling program where possible. These have
recently included incremental modifications to the scope of the 1,4-dioxane sampling program to reflect
the 1,4-dioxane monitoring results. In addition, the scope of the semi-annual sampling event was slightly
reduced in 2022 based on a review of historical data trends which supported the removal of two of the
deep bedrock monitoring wells from the event.
Due to a stuck pump in IRTS extraction well, MW17DB which occurred during a pump change out in July
2021, this well has not been sampled since May 2021 with EPA concurrence. A resolution to this issue
will be incorporated into modifications made to the extraction well system as part of the management of
migration remedy.
Further alterations and reductions in the sampling frequency and analytical requirements of the Long-
Term Monitoring Program will be considered once the source area and management of migration
remedies have been implemented.
13. What is your interpretation of the monitoring data (i.e. increasing trends, decreasing trends,
evidence of stability)?
-------
Response: Detailed evaluations of trends in the monitoring data are presented in the Mann- Kendall
analyses performed as part of the annual monitoring reports. Overall, VOC groundwater concentration
trends have been decreasing at the site over the long term.
Statistically increasing or probably increasing total VOC and trichloroethene (TCE) trends for several of
the Reconfigured Phase IA till and shallow bedrock extraction wells changed to no trend or probably
decreasing trends in recent short-term statistical analyses. Total VOC and TCE concentrations at
downgradient domestic wells GW14 and GW76DB (to the south-southwest of the facility) have
consistently indicated decreasing trends over the past several short-term statistical analyses. Chlorinated
VOC breakdown products contribute the majority of the total VOC concentrations in source area wells
OW-OISB, OW-04SB, MW10SB and GW10DB and in some downgradient wells (e.g., GW08DB,
GW12DB and MW35DB) as well as in untreated water from domestic wells GW14 and GW76DB. These
results indicate that natural dechlorination of TCE is occurring.
-------
INTERVIEW
RECORD
Site Name: Linemaster Switch
EPA ID No.:
Subject: Five Year Review
Time: 11 AM Date:
4/29/2024
Type: ^Telephone ~ Visit ¦ Other
Location of Visit: Chandler Paguette provided written responses to these
questions and submitted them via email on April 29, 2024.
~ Incoming ~ Outgoing
Contact Made By:
Name:
Ashley James (EPA ESO Contractor)
Title:
Project Coordinator
Organization:
Sanborn Head & Associates
Individual Contacted:
Name: Chandler Paquette
Title:
First Selectman
Organization: Town of Woodstock
Telephone No: N/A
Fax No: N/A
E-Mail Address: N/A
Street Address:
1. What is your overall impression of the project and site?
Response: They have always maintained a neat and clean site.
2. Are you aware of any issues the five-year review should focus on?
Response: No, lam not.
3. Do you have any comments or suggestions regarding the site's management or operation?
Response: Please continue the good work.
4. Are you aware of any community concerns regarding the site or its operations and
administration?
Response: No
5. Have there been any changes in the site or surrounding property in the last 5 years, or are
changes planned?
Response: No
6. Have there been any complaints or incidents that required a response by your office?
Response: None
7. What effects have site operations had on the surrounding community?
Response: None
8. Do you feel well informed about the site's activities and progress?
Response: Completely
-------
INTERVIEW
RECORD
Site Name: Linemaster Switch
EPA ID No.:
Subject: Five Year Review
Time: 11 AM Date: 6/5/2024
Type: ^Telephone ~ Visit ¦ Other
Location of Visit: Michael Senyk provided written responses to these
questions and submitted them via email on June 5, 2024.
~ Incoming ~ Outgoing
Contact Made By:
Name: Title:
Ashley James (EPA ESO Contractor) Project Coordinator
Organization:
Sanborn Head & Associates
Individual Contacted:
Name: Michael Senyk
Title:
Project
Manager
Organization: CTDEEP
Telephone No: 860-424-3782
Fax No: N/A
E-Mail Address: Michael.senyk@ct.gov
Street Address:
1. What is your overall impression of the project and site?
Response: Remedial activities are improving conditions at the site. Continued cooperation with the RP
and surrounding community are encouraging.
2. Are you aware of any issues the five-year review should focus on?
Response: Preventing further off-site migration of ground water contamination to protect those currently
using the ground water for drinking water purposes and to protect the drinking water resource for future
development potential.
3. Is the remedy functioning as expected?
Response: The remedy has been acceptable.
4. Do you have any comments or suggestions regarding the site's management or operation?
Response: Continued diligence protecting drinking water should be paramount.
5. Are you aware of any community concerns regarding the site or its operations and
administration?
Response: No.
6. Have there been any changes in the site or surrounding property in the last 5 years, or are
changes planned?
Response: Land surrounding the site could be developed for residential use in the future. Any
development would rely on ground water for drinking water.
7. Have there been any complaints or incidents that required a response by your office?
Response: CTDEEP is not aware of any complaints or incidents related to the site that required a
response in the last 5 years.
-------
8. What effects have site operations had on the surrounding community?
Response: Ground water used by the surrounding community for drinking water has been impacted by
historic site operations.
9. Do you feel well informed about the site's activities and progress?
Response: Yes. CTDEEP has been well informed about site activities.
-------
Appendix D
Five-Year Review Site Inspection Checklist
and
Photograph Log
-------
OSWER No. 9355.7-03B-P
Five-Year Review Site Inspection Checklist
(Working document for site inspection. Information may be completed by hand and attached to
the Five-Year Review report as supporting documentation of site status. "N/A" refers to "not
applicable.")
I. SITE INFORMATION
Site names Linemaster Switch Corporation Superfund
Date of inspection: April 24, 2024
Location and Region: Woodstock, CT - Region 1
EPA ID: CTD001153923
Agency, office, or company leading the five-year
review: EPA
Weather/temperature: p£||1|y C|0udy ^
Remedy Includes: (Check all that apply)
~ Landfill cover/containment
~ Access controls
J Institutional controls
/ Groundwater pump and treatment
~ Surface water collection and treatment
~ Other
Attachments: ~ Inspection team roster attached ~ Site map attached site prolog attached
EL INTERVIEWS (Check all that apply) No interviews performed during site inspection.
1. O&M site manager
Name Title Date
Interviewed ~ at site ~ at office ~ by phone Phone no.
Problems, suggestions; ~ Report attached Not interviewed during site inspection.
~ Monitored natural attenuation
/ Groundwater containment
~ Vertical barrier walls
D-3
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OSWER No. 9355.7-03B-P
2. O&M staff
Name Title
Interviewed ~ at site ~ at office ~ by phone Phone no.
Date
Problems, suggestions; ~ Report attached Not interviewed during site Inspection.
3. Local regulatory authorities and response agencies (i.e., State and Tribal offices, emergency response
office, police department, office of public health or environmental health, zoning office, recorder of
deeds, or other city and county offices, etc.) Fill in all that apply.
Agency
Contact
Name
Problems; suggestions; ~ Report attached
Title
Date Phone no.
Agency
Contact
Name
Problems; suggestions; ~ Report attached
Title
Date Phone no.
Agency
Contact
Name
Problems; suggestions; ~ Report attached
Title
Date Phone no.
Agency
Contact
Name Title Date Phone no.
Problems; suggestions; ~ Report attached Not interviewed during site inspection.
4. Other interviews (optional) ~ Report attached.
D-4
-------
OSWER No. 9355.7-03B-P
in. ON-SITE DOCUMENTS & RECORDS VERIFIED (Check all that apply)
1.
O&M Documents
[2 O&M manual ~ Readily available ~ Up to date ~ N/A
~ As-built drawings ~ Readily available ~ Up to date
12 Maintenance logs ~ Readily available ~ Up to date
Remarks The O&M manual is available digitally.
2 N/A
~ N/A
2.
Site-Specific Health and Safely Plan ~ Readily available [2 Up to date ~ N/A
~ Contingency plan/emergency response plan ~ Readily available ~ Up to date ~ N/A
Remarks Information not available at the time of the site inspection. It was requested subsequently by USEPA,
but to date has not been provided.
3.
O&M and OSHA Training Records ~ Readily available ~ Up to date
~ N/A
Remarks Information not available at the time of the site inspection. It was requested subsequently by USEPA, but to date has not been provided.
4.
Permits and Service Agreements
~ Air discharge permit ~ Readily available ~ Up to date
12 Effluent discharge ~ Readily available ~ Up to date
~ Waste disposal, POTW ~ Readily available ~ Up to date 2 N/A
~ Other permits ~ Readily available ~ Up to date
Remarks
2 N/A
~ N/A
2 N/A
5.
Gas Generation Records ~ Readily available ~ Up to date 2 N/A
Remarks
6.
Settlement Monument Records ~ Readily available ~ Up to date
Remarks
2 N/A
7.
Groundwater Monitoring Records ~ Readily available ~ Up to date
Remarks
2 N/A
8.
Leachate Extraction Records ~ Readily available ~ Up to date
Remarks
2 N/A
9.
Discharge Compliance Records
~ Air ~ Readily available ~ Up to date ~ N/A
~ Water (effluent) ~ Readily available ~ Up to date ~ N/A
Remarks Information not available at the time of the site Inspection. It was requested subsequently by USEPA,
but to date has not been provided.
10.
Daily Access/Security Logs ~ Readily available ~ Up to date
Remarks
2 N/A
D-5
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OSWER No. 9355.7-03B-P
IV. O&M COSTS
1. O&M Organization
~ State in-house
Itl PRP in-house
~ Federal Facility in-house
~ Other
~ Contractor for State
~ Contractor for PRP
~ Contractor for Federal Facility
2. O&M Cost Records
~ Readily available ~ Up to date
~ Funding mechanism/agreement in place
Original O&M cost estimate
Information not available at the time of the site
inspection. It was requested subsequently by USEPA,
but to date has not been provided.
~ Breakdown attached
Total annual cost by year for review period if available
From
To
~ Breakdown attached
From
Date
To
Date
Total cost
~ Breakdown
attached
From
Date
To
Date
Total cost
~ Breakdown
attached
From
Date
To
Date
Total cost
~ Breakdown
attached
From
Date
To
Date
Total cost
~ Breakdown
attached
Date
Date
Total cost
3. Unanticipated or Unusually High O&M Costs During Review Period
Describe costs and reasons.
Follow-up required for this section.
Information not available at the time of the site inspection. It was requested subsequently by USEPA,
but to date has not been provided.
V. ACCESS AND INSTITUTIONAL CONTROLS ~ Applicable DN/A
A. Fencing
1. Fencing damaged ~ Location shown on site map ~ Gates secured DN/A
Remarks Parts of the property are fenced and gated, but not regularly secured
during business hours.
B. Other Access Restrictions
1. Signs and other security measures ~ Location shown on site map
Remarks There are no-trespassing signs onsite.
~ N/A
D-6
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OSWER No. 9355.7-03B-P
C. Institutional Controls (ICs)
I. Implementation and enforcement
Site conditions imply ICs not properly implemented ~ Yes ft No DN/A
Site conditions imply ICs not being fully enforced ~ Yes ft No DN/A
Type of monitoring (e.g., self-reporting, drive by)
Frequency
Responsible party/agency
Contact
Name Title Date Phone no.
Reporting is up-to-date
~ Yes
~ No
ft N/A
Reports are verified by the lead agency
~ Yes
~ No
ft N/A
Specific requirements in deed or decision documents have been met
ft Yes
~ No
~ N/A
Violations have been reported
~ Yes
~ No
ft N/A
Other problems or suggestions: ~ Report attached
2. Adequacy ft ICs are adequate ~ ICs are inadequate ~ N/A
Remarks The pavement in the Phase IA Source Area is well-worn and has areas that are heavily
weathered.
D. General
1. Vandalism/trespassing ~ Location shown on site map ft No vandalism evident
Remarks
2. Land use changes on site ft N/A
Remarks
3. Land use changes off site ft N/A
Remarks
VI. GENERAL SITE CONDITIONS
A. Roads ft Applicable ON/A
1. Roads damaged ~ Location shown on site map ft Roads adequate^ N/A
Remarks Roads around the site are adequate, but show signs of moderate weathering/use.
D-7
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OSWER No. 9355.7-03B-P
B. Other Site Conditions
Remarks
Vn. LANDFILL COVERS ~ Applicable 0N/A
A. Landfill Surface
1. Settlement (Low spots)
Areal extent
Remarks
~ Location shown on site map ~ Settlement not evident
Depth
2. Cracks
Lengths_
Remarks
~ Location shown on site map ~ Cracking not evident
Widths Depths
3. Erosion
Areal extent_
Remarks
~ Location shown on site map ~ Erosion not evident
Depth
Holes
Areal extent_
Remarks
~ Location shown on site map ~ Holes not evident
Depth
5. Vegetative Cover ~ Grass ~ Cover properly established ~ No signs of stress
~ Trees/Shrubs (indicate size and locations on a diagram)
Remarks
6. Alternative Cover (armored rock, concrete, etc.) ~ N/A
Remarks
7. Bulges
Areal extent_
Remarks
~ Location shown on site map ~ Bulges not evident
Height
D-8
-------
OSWER No. 9355.7-03B-P
8.
Wet Areas/Water Damage
~ Wet areas
~ Ponding
~ Seeps
~ Soft subgrade
Remarks
~ Wet areas/water damage not evident
~ Location shown on site map Areal extent
~ Location shown on site map Areal extent
~ Location shown on site map Areal extent
~ Location shown on site map Areal extent
9.
Slope Instability ~ Slides
Areal extent
Remarks
~ Location shown on site map ~ No evidence of slope instability
B.
Benches ~ Applicable ~ N/A
(Horizontally constructed mounds of earth placed across a steep landfill side slope to interrupt the slope
in order to slow down the velocity of surface runoff and intercept and convey the runoff to a lined
channel.)
1.
Flows Bypass Bench
Remarks
~ Location shown on site map ~ N/A or okay
2.
Bench Breached
Remarks
~ Location shown on site map ~ N/A or okay
3.
Bench Overtopped
Remarks
~ Location shown on site map ~ N/A or okay
C.
Letdown Channels ~ Applicable ~ N/A
(Channel lined with erosion control mats, riprap, grout bags, or gabions that descend down the steep side
slope of the cover and will allow the runoff water collected by the benches to move off of the landfill
cover without creating erosion gullies.)
1.
Settlement ~ Location shown on site map ~ No evidence of settlement
Areal extent Depth
Remarks
2.
Material Degradation ~ Location shown on site map ~ No evidence of degradation
Material type Areal extent
Remarks
3.
Erosion ~ Location shown on site map ~ No evidence of erosion
Areal extent Depth
Remarks
D-9
-------
OSWER No. 9355.7-03B-P
4.
Undercutting ~ Location shown on site map ~ No evidence of undercutting
Areal extent Depth
Remarks
5.
Obstructions Type
~ Location shown on site map
Size
Remarks
~ No obstructions
Areal extent
6.
Excessive Vegetative Growth Type
~ No evidence of excessive growth
~ Vegetation in channels does not obstruct flow
~ Location shown on site map Areal extent
Remarks
D.
Cover Penetrations ~ Applicable ~ N/A
1.
Gas Vents ~ ActiveD Passive
~ Properly secured/locked ~ Functioning ~ Routinely sampled ~ Good condition
~ Evidence of leakage at penetration ~ Needs Maintenance
~ N/A
Remarks
2.
Gas Monitoring Probes
~ Properly secured/locked ~ Functioning
~ Evidence of leakage at penetration
Remarks
~ Routinely sampled ~ Good condition
~ Needs Maintenance ~ N/A
3.
Monitoring Wells (within surface area of landfill)
~ Properly secured/locked ~ Functioning ~ Routinely sampled ~ Good condition
~ Evidence of leakage at penetration ~ Needs Maintenance ~ N/A
Remarks
4.
Leachate Extraction Wells
~ Properly secured/locked ~ Functioning
~ Evidence of leakage at penetration
Remarks
~ Routinely sampled ~ Good condition
~ Needs Maintenance ~ N/A
5.
Settlement Monuments ~ Located ~ Routinely surveyed ~ N/A
Remarks
D-10
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OSWER No. 9355.7-03B-P
E.
Gas Collection and Treatment ~ Applicable ~ N/A
1.
Gas Treatment Facilities
~ Flaring ~ Thermal destruction ~ Collection for reuse
~ Good condition ~ Needs Maintenance
Remarks
2.
Gas Collection Wells, Manifolds and Piping
~ Good condition ~ Needs Maintenance
Remarks
3.
Gas Monitoring Facilities (e.g., gas monitoring of adjacent homes or buildings)
~ Good condition ~ Needs Maintenance ~ N/A
Remarks
F.
Cover Drainage Layer ~ Applicable ~ N/A
1.
Outlet Pipes Inspected ~ Functioning ~ N/A
Remarks
2.
Outlet Rock Inspected ~ Functioning ~ N/A
Remarks
G.
Detention/Sedimentation Ponds ~ Applicable ~ N/A
1.
SiltationAreal extent Depth DN/A
~ Siltation not evident
Remarks
2.
Erosion Areal extent Depth
~ Erosion not evident
Remarks
3.
Outlet Works ~ Functioning ~ N/A
Remarks
4.
Dam ~ Functioning ~ N/A
Remarks
D-ll
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OSWER No. 9355.7-03B-P
H.
Retaining Walls
~ Applicable ~ N/A
1.
Deformations
Horizontal displacement
~ Location shown on site map ~ Deformation not evident
Vertical displacement
Rotational displacement
Remarks
2.
Degradation
Remarks
~ Location shown on site map ~ Degradation not evident
I. Perimeter Ditches/Off-Site Discharge ~ Applicable DN/A
1.
Siltation ~ Location shown on site map ~ Siltation not evident
Area! extent Depth
Remarks
2.
Vegetative Growth ~ Location shown on site map ~ N/A
~ Vegetation does not impede flow
Areal extent Type
Remarks
3.
Erosion
Areal extent
Remarks
~ Location shown on site map ~ Erosion not evident
Depth
4.
Discharge Structure
Remarks
~ Functioning ~ N/A
Vni. VERTICAL BARRIER WALLS ~ Applicable DN/A
1.
Settlement
Areal extent
~ Location shown on site map ~ Settlement not evident
Depth
Remarks
2.
Performance Monitoring Type of monitoring
~ Performance not monitored
Frequency ~ Evidence of breaching
Head differential
Remarks
D-12
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OSWER No. 9355.7-03B-P
IX. GROUNDWATER/SURFACE WATER REMEDIES £ Applicable DN/A
A. Groundwater Extraction Wells, Pumps, and Pipelines 12 Applicable ~ N/A
1.
Pumps, Wellhead Plumbing, and Electrical
21 Good condition~ All required wells properly operating ~ Needs Maintenance ~ N/A
Remarks Deep bedrock extraction well MW06DB, future potable drinking water well MW14DB, and current potable
drinking water well GW08DB were observed. The Wells and pumps were not opened.
2.
Extraction System Pipelines, Valves, Valve Boxes, and Other Appurtenances
H Good condition ~ Needs Maintenance
Remarks Above -ground equipment to be in good condition, and piping is generally underground.
3.
Spare Parts and Equipment
12 Readily available ~ Good condition ~ Requires upgrade ~ Needs to be provided
Remarks Spare parts for repairs are kept on-site.
B. Surface Water Collection Structures, Pumps, and Pipelines 0 Applicable ~ N/A
1.
Collection Structures, Pumps, and Electrical
12 Good condition ~ Needs Maintenance
Remarks The collection structure at Pond 3 is in good condition (First effluent location after treatment).
2.
Surface Water Collection System Pipelines, Valves, Valve Boxes, and Other Appurtenances
12 Good condition ~ Needs Maintenance
Remarks
3.
Spare Parts and Equipment
0 Readily available 0 Good condition ~ Requires upgrade ~ Needs to be provided
Remarks
D-13
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OSWER No. 9355.7-03B-P
c.
Treatment System Ifl Applicable ~ N/A
1.
Treatment Train (Check components that apply)
~ Metals removal ~ Oil/water separation ~ Bioremediation
21 Air stripping 21 Carbon adsorbers
~ Filters
~ Additive (e.g., chelation agent, flocculent)
~ Others
21 Good condition ~ Needs Maintenance
21 Sampling ports properly marked and functional
21 Sampling/maintenance log displayed and up to date
21 Equipment properly identified
~ Quantity of groundwater treated annually See TRC's Annual Reports (2019-2023)
~ Quantity of surface water treated annually
Remarks
2.
Electrical Enclosures and Panels (properly rated and functional)
~ N/A 12 Good condition^ Needs Maintenance
Remarks
3.
Tanks, Vaults, Storage Vessels
~ N/A 2l Good condition^ Proper secondary containment ~ Needs Maintenance
Remarks
4.
Discharge Structure and Appurtenances
~ N/A 2l Good condition^ Needs Maintenance
Remarks
5.
Treatment Building(s)
~ N/A 2l Good condition (esp. roof and doorways) ~ Needs repair
~ Chemicals and equipment properly stored
Remarks
6.
Monitoring Wells (pump and treatment remedy)
2l Properly secured/locked 2l Functioning 2l Routinely sampled 2l Good condition
~ All required wells located ~ Needs Maintenance ~ N/A
Remarks
D. Monitoring Data
1.
Monitoring Data
2l Is routinely submitted on time 2l Is of acceptable quality
2.
Monitoring data suggests: See the 2023 Annual Report
~ Groundwater plume is effectively contained ~ Contaminant concentrations are declining
D-14
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OSWER No. 9355.7-03B-P
D.
Monitored Natural Attenuation
1.
Monitoring Wells (natural attenuation remedy)
~ Properly secured/locked ~ Functioning ~ Routinely sampled ~ Good condition
~ All required wells located ~ Needs Maintenance 21N/A
Remarks
X. OTHER REMEDIES
If there are remedies applied at the site which are not covered above, attach an inspection sheet describing
the physical nature and condition of any facility associated with the remedy. An example would be soil
vapor extraction.
XI. OVERALL OBSERVATIONS
A.
Implementation of the Remedy
Describe issues and observations relating to whether the remedy is effective and functioning as designed.
Begin with a brief statement of what the remedy is to accomplish (i.e., to contain contaminant plume,
minimize infiltration and gas emission, etc.).
The remedy is designed to limit contaminants in groundwater and surface water from migrating offsite. Issues
regarding the remedy are addressed in TRC's Focused Feasibility Study (FFS), which was finalized in October
2023. Furthermore, EPA published a Proposed Plan in December 2023 that summarizes the issues and proposes
their preferred solution based off the FFS.
B.
Adequacy of O&M
Describe issues and observations related to the implementation and scope of O&M procedures. In
particular, discuss their relationship to the current and long-term protectiveness of the remedy.
No issues were observed regarding the implementation and scope of O&M procedures. O&M at the site is
proactively performed and any issues with pumps/treatment system are documented and remedied quickly.
D-15
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OSWER No. 9355.7-03B-P
C.
Early Indicators of Potential Remedy Problems
Describe issues and observations such as unexpected changes in the cost or scope of O&M or a high
frequency of unscheduled repairs, that suggest that the protectiveness of the remedy may be
compromised in the future.
No issues were observed that would suggest that the protectiveness of the remedy may be compromised
in the future.
D.
Opportunities for Optimization
Describe possible opportunities for optimization in monitoring tasks or the operation of the remedy.
Please see EPA's 2023 proposed plan for a summary of future remedial activities at the site.
D-16
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Site Inspection Photograph Log
Photo 1: Phase IA Source Area and former dry well (light blue polymer cap in the center background).
Photo taken by Chris Vignola (Sanborn Head) facing northwest.
Photo 2: Phase IA Source Area. Photo taken by Angela McGinty (EA Engineering) facing west.
Sanborn, Head & Associates, Inc. sanbornhead.com
-------
June 2024
Site Inspection Photolog
Photo 3: Phase IA Source Area. Photo taken by Angela McGinty (EA Engineering) facing north.
Photo 4: Phase IA Source Area and the Linemaster Switch Corporation facility. Photo taken by Angela
McGinty (EA Engineering) facing southwest.
4967.00
Page 2 Sanborn, Head & Associates, Inc. sanbornhead.cor
-------
June 2024
Site Inspection Photolog
Photo 5: Deep bedrock extraction well MW06DB. Photo taken by Chris Vignola (Sanborn Head) facing
southeast.
Photo 6:
Deep bedrock extraction well (and future potable drinking water well for Linemaster Switch
Corporation) MW14DB. Photo taken by Chris Vignola (Sanborn Head) facing southwest.
4967.00
Page 3
Sanborn, Head & Associates, Inc.
-------
June 2024
Site Inspection Photolog
Photo 8: Potable water supply well GW08DB. Photo taken inside of the current potable water supply well
building by Chris Vignola (Sanborn Head).
4967.00
Page 4
Sanborn, Head & Associates, Inc.
sanbornhead.com
-------
June 2024
Site Inspection Photolog
Photo 9
Potable water supply well building that houses potable water supply well GW08DB, Photo taken
facing south by Chris Vignola (Sanborn Head).
Photo 10: Deep bedrock extraction well GW10DB. Photo taken by Angela McGinty (EA Engineering) inside
the Linemaster Switch Corporation facility.
4967.00
Page 5
Sanborn, Head & Associates, Inc.
sanbornhead.com
-------
June 2024
Site Inspection Photolog
Photo 11: IRTS Treatment Building (center background, 2-story red building) and the Linemaster Switch
Corporation facility in the background (center right, blue building). Photo taken by Chris Vignola
(Sanborn Head) facing south.
Photo 12: Groundwater treatment system within the IRTS Treatment Building. Photo taken inside of the
treatment building by Chris Vignola (Sanborn Head).
4967.00
Page 6
Sanborn, Head & Associates, Inc.
sanbornhead.com
-------
June 2024
Site Inspection Photolog
Photo 13: IRTS Treatment Building. Photo taken from the Phase IA Source area facing northeast by Angela
McGinty (EA Engineering).
Photo 14: Pond 3 (first effluent discharge from Treatment Building). Photo taken by Chris Vignola (Sanborn
Head) facing south.
4967.00
Page 7
Sanborn, Head & Associates, Inc.
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June 2024
Site Inspection Photolog
Photo 15: Pond 3 (first effluent discharge from Treatment Building) and the sampling area (covered by metal
grate on the concrete pad) for effluent sampling. Photo taken by Angela McGinty (EA Engineering)
facing south.
Photo 16: Pond 1 (second effluent discharge). Photo taken by Angela McGinty (EA Engineering) facing north.
4967.00
Page 8
Sanborn, Head & Associates, Inc.
-------
June 2024
Site Inspection Photolog
Photo 18: Final discharge from Pond 1 which forms a creek that flows south offsite. Photo taken by Chris
Vignola (Sanborn Head) facing south.
4967.00
Page 9
Sanborn, Head & Associates, Inc.
-------
June 2024
Site Inspection Photolog
Photo 19: Final discharge from Pond 1 which forms a creek that flows south offsite. Photo taken by Angela
McGinty (EA Engineering) facing south.
P:\4900s\4967.00\Source Files\5-Year Review\Appendix D - Site lnspectiori\2024O424 Site Inspection Photos\20240625_Photolog.docx
4967.00
Page 10
Sanborn, Head & Associates, Inc.
sanbornhead.com
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Appendix E
Five-Year Review Press Release
-------
8/29/24, 3:29 PM EPA to Review Cleanup at Woodstock, Connecticut Superfund Site this Year | US EPA
An official website of the United States government
(X menu
News Releases: Region 01 CONTACT US
EPA to Review Cleanup at
Woodstock, Connecticut
Superfund Site this Year
February 1,2024
Contact Information
James Anderson (anderson.james.r@epa.gov)
(617) 918-1401
BOSTON (Feb. 1,2024) - The U.S. Environmental Protection Agency (EPA) will conduct a
comprehensive review of completed cleanup work at the Linemaster Switch
Corporation National Priorities List (NPL) Superfund site in Woodstock, Connecticut this
year.
Each individual site will undergo a legally required Five-Year Review to ensure that
previous remediation efforts at the sites continue to protect public health and the
environment. Once the Five-Year Review is complete, its findings will be posted to EPA's
website in a final report.
"Every step of the process at a Superfund site is critical and reflects a commitment we
make with local communities to be as thorough as possible. Cleaning up hazardous
waste sites takes extensive time and effort, and these Five-Year Reviews allow EPA to
ensure our cleanup efforts continue to protect public health and the environment,
while keeping everyone informed and accountable, especially in those communities
that have been overburdened by industrial pollution." said EPA New England Regional
Administrator David W. Cash. "EPA continues to evaluate these cleanups, with the
overarching mission to protect public health and the environment and ensuring that
Connecticut communities will continue to be protected."
https://www.epa.gov/newsreleases/epa-review-cleanup-woodstock-connecticut-superfund-site-year
1/3
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8/29/24, 3:29 PM
EPA to Review Cleanup at Woodstock, Connecticut Superfund Site this Year | US EPA
In 2024 EPA will conduct Five-Year Reviews at the below listed sites. The included web
links provide detailed information on site status as well as past assessment and cleanu
activity.
Five-Year Reviews of Superfund site in Connecticut to be completed in 2024:
Linemaster Switch Corp., Woodstock
More information:
The Superfund program, a federal program established by Congress in 1980,
investigates and cleans up the most complex, uncontrolled, or abandoned hazardous
waste sites in the country and EPA endeavors to facilitate activities to return them to
productive use. In total, there are 123 Superfund sites across New England.
H Superfund and other cleanup sites in New England (pdf)
(91.4 KB)
EPA'S Superfund program
Contact Us to ask a question, provide feedback,
or report a problem.
LAST UPDATED ON FEBRUARY 1,2024
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8/29/24, 3:29 PM
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3/3
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Appendix F
Site Chronology
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Site Chronology
Event Date
LMS begins operating foot-operated switches at the Site
May 1952
CTDEP conducted Site inspection pursuant to RCRA
July 1980
EPA conducted Site Inspections
December 1985 &
February 1986
Administrative Order by Consent signed between EPA and LMS
September 1987
Proposed NPL Listing
June 24,1988
Final NPL Listing
February 21,1990
Groundwater extraction and treatment system (IRTS) is installed to
control contaminant migration off-Site
June 1992
RI/FS Complete
December 1992
ROD Signed
July 21,1993
Consent Decree signed by LMS and EPA
1994
First Pilot test to design dual vapor extraction (DVE) system
December 1994
Second Pilot test conducted
November 1995
Construction of the DVE remedial system completed
November 1998
Due to lack of performance DVE system is re-evaluated
November 21, 2003
EPA authorizes LMS to deactivate the vacuum extraction portion of
the DVE system
November 26, 2003
First FYR Complete
May 24, 2004
ESD to the ROD - allowing the deactivation of the vacuum extraction
system
December 13, 2004
Vapor extraction component of the DVE permanently
decommissioned
2004
Institutional Controls finalized
2005
Institutional Controls updated
September 2008
Second FYR Complete
July 2009
1,4-Dioxane begin sampling
May 2010
Vapor Intrusion Study
March 2011
Third FYR Complete
September 2014
Long Term Monitoring Plan updated
November 2015
New Monitoring wells installed (source investigation)
August - September 2017
-------
2017 Site Investigation Report, Deep Well Installation, Source Area
Investigation, CSM Update, and Remedial Alternative Screening
February 2018
Initial development of Focused Feasibility Study
2018
Fourth FYR Complete
September 2019
Final Focused Feasibility Study
October 2020
Supplemental HHRA
December 2021
Proposed Plan
November 2023
Fifth FYR Complete
September 2024
Interim ROD Complete
2024
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