45-49 CONGRESS STREET IRA STATUS REPORT #7 (6-6-23) jUN 0 9 2023
PAIrrNE:R CITY OF SALEM
Engineering and$ClenC@, Inc: BOARD OF HEALTH
June 6, 2023
David Greenbaum, Health Agent
Board of Health
Salem City Hall
98 Washington Street
Salem, MA 01970
Subject: Immediate Response Action (IRA) Status Report#7
Prime Storage Shetland— Building 4
45-49 Congress Street
Salem, Massachusetts 01970
RTN: 3-35818
Partner Project Number 19298406
Dear Mr. Greenbaum:
Partner Engineering and Science, Inc. (Partner) on behalf of Prime Storage Shetland, LLC (our client), anti
pursuant to the Massachusetts Contingency Plan (MCP), 310 CMR 40.1403(3)(b), is notifying you of the
submittal of an Immediate Response Action (IRA) Status Report for Prime Storage Shetland Park located at
45-49 Congress Street, Salem, Massachusetts (subject property) to the Massachusetts Department of
Environmental Protection (MassDEP)
Partner has been conducting assessment activities for a 120-day release condition related to the detection
of trichloroethene (TCE) and pyrene in groundwater above the Massachusetts Contingency Plan (MCP
RCGW-2 reportable concentrations. The release is tracked under release tracking number (RTN) 3-35818
Part of the assessment activities included an investigation of a potential vapor intrusion condition.
On January 30,2020 Partner conducted an indoor air quality sampling investigation for potential TCE impac,
to indoor air in the basement level of Building 4, Prime Storage Shetland Park. Laboratory results detected
TCE at a maximum concentration of 27.7 micrograms per cubic meter(pg/m3)which represents an Imminent
Hazard (IH) condition for sensitive receptors. Partner verbally notified the MassDEP on February 6, 2020
the IH condition. MassDEP subsequently assigned RTN 3-36124 to the detected IH condition.
On April 6, 2020, Partner submitted an IRA Plan to the MassDEP. The proposed objectives of the IRA Plain
were to continue the operation of air purifying units (APUs), limit access to the area of investigation foi
sensitive sub groups, seal preferential pathways, conduct a sub slab depressurization system (SSDS) pilot
test to aid in the design of the system to mitigate the vapor intrusion pathway, and to conduct additional
exterior assessment activities to determine the extent of groundwater impact, specifically towards thr
residential area west of Building 4.
800-419-4923 www.PARTNEResi.com
PARTNER
ngineeaft nd Science, Inc:
IRA Status Report #1 was submitted on June 5, 2020 which documented that APUs were installed in the
:jrea of investigation in basement area of Building 4, sealing of preferential pathways had been performed,
and continued access requests were made but without approval to date.
IRA Status Report #2 was submitted on December 7, 2020 which documented the installation of two
additional APU units in occupied tenant spaces in the basement of Building 4, the completion of an SSDS
pilot, the completion of a passive soil gas survey, an additional round of indoor air quality sampling, a
building survey, and on going residential sampling efforts.
On February 3, 2021, Partner linked RTN 3-36124 (daughter RTN) to RTN 3-35818 (parent RTN). RTN 3-
36124 is now closed and this and future submittals will be made under the parent RTN 3-35818.
IRA Status Report#3 was submitted on June 3, 2021, which documented on going IRA activities including
an additional Building 4 Indoor Air Quality(IAQ), residential IAQ sampling, an APU performance evaluation,
monitoring well gauging to determine groundwater flow direction, and a Building 4 survey for the
evaluation of a vapor mitigation strategy.
A Modified IRA Plan was submitted on October22,2021 for the proposed activities of sealing of preferential
pathways using concrete, the installation of a vapor barrier in a dirt floor hallway, and the installation of
sub-slab depressurization systems (SSDSs).
IRA Status Report #4 was submitted on December 6, 2021, which documented ongoing IRA activities
including SSDS pilot test and diagnostic testing in Building 4, interior and exterior source delineation, an
additional Building 4 IAQ sampling, residential access request efforts, and additional APUs installation in
the basement level of Building 4.
Phis IRA Status Report#5 was submitted on June 6,2022,which documented post APU Building 4 basement
IAQ sampling, Building 4 basement sealing activities, monitoring well gauging events, SSDS installation
activities, Pingree Street vapor intrusion pathway investigation and access efforts, additional interior and
exterior source delineation, SSDS O&M activities,and a post SSDS Building 4 basement IAQ sampling event.
IRA Status Report#6 was submitted on December 6, 2022, which summarized quarterly groundwater, soil
gas, and indoor air sampling, Salem Academy indoor air sampling, Building 4 basement sealing activities,
Pingree Street vapor intrusion pathway investigation and access efforts, and SSDS O&M activities.
This IRA Status Report #7 summarizes residential SSDS diagnostic testing, Building 4 SSDS diagnostic
testing, residential indoor air testing, quarterly groundwater, soil gas, and indoor air sampling, Salem
Academy indoor air sampling, Building 4 basement sealing activities, residential access efforts, and SSDS
O&M activities, bedrock well installation and logging activities, and additional TCE delineation.
800-419-4923 www.PARTNEResi.com
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PARTNER
Engineering.and Science, Inc:
Pursuant to Section 40.1403(9) of the Massachusetts Contingency Plan (MCP), local officials of a community
in which a disposal site is located or in any other communities which are, or are likely to be, affected by a
disposal site may request an opportunity for Public Involvement Activities related to any Immediate
Response Actions conducted pursuant to 310 CMR 40.0410 or Release Abatement Measures conducted
pursuant to 310 CMR 40.0440 and upon Tier Classification pursuant to 310 CMR 40.1404. Such request,
shall be made in writing to the person(s) conducting the response actions and copied concurrently t(
MassDEP.
If you have any questions concerning this letter, please contact the undersigned at (508) 876-2660.
Sincerely,
Partner Engineering and Science. Inc.
9
Tom A. Campbell, LSPA Jerry Ostrander
Project Manager Regional Director- Site Mitigation
cc: Robert J. Moser, CEO (Prime Storage Shetland, LLC)
MassDEP Northeast Region
City of Salem Mayors Office
800-419-4923 www.PARTNEResi.com
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