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45 CONGRESS STREET PRIME STORAGE SHETLAND PARTIAL TSS PARTNER 495 Old Connecticut Path, Suite 120, Framingham, Massachusetts 01701 Engineering and Science, Inc: 0(1w RECEIVED August 20, 2025 David Greenbaum, Health Agent AUG 2 5 2025 Board of Health CITY OFSALEM Salem City Hall BOARD OF HEALTH 98 Washington Street Salem, MA 01970 Subject: Partial Temporary Solution Statement Prime Storage Shetland 45 Congress Street Salem, Massachusetts 01970 Release Tracking Number (RTN): 3-35818 Dear Mr. Greenbaum: On behalf of Prime Storage Shetland, LLC, this letter is being sent to you to fulfill the public involvement provisions of the Massachusetts Contingency Plan (MCP) for the above-referenced Site. The public involvement provisions [310 CMR 40.1403(3)(f)] require that the Chief Municipal Officer and the Board of Health in the community in which a disposal site is located be notified that a Partial Temporary Solution Statement (TSS) has been completed for the above-named property. A copy of the Summary and Conclusions of the Partial TSS is enclosed which contains information about the Disposal Site and completed remedial activities. The Partial TSS was submitted electronically to the Massachusetts Department of Environmental Protection. It is available for review using the following link: https://eeaonline.eea.state.ma.usi portal/dep/wastesite/results?queryString=rtn:3-0035818 If you have any questions concerning this letter, please contact the undersigned at (508) 876- 2660. Sincerely, Partner Engineering and Science, Inc. "�I A 0 1 WV Tom A. Campbell, LSP Susan O'Brian Senior Project Manager Senior LSP—Site Mitigation Enclosure More than just assessments-solutions. 8.0 CONCLUSIONS In 2019,elevated concentrations of chlorinated volatile organic compounds(CVOCs)were initially identified in groundwater, sub-slab soil gas and indoor air at the property with an address of 45 Congress Street. The sub-slab soil gas and indoor air exceedances were identified at Building 4, an industrial and commercial use building which is located at the 45 Congress Street property. Additional investigations were subsequently performed to delineate the extent of contamination. The Disposal Site Boundary includes a portion of the property at 45 Congress Street, as well as 11 off-site residential/commercial properties west of the 45 Congress Street property along Pingree Street, Palmer Streets, and Leavitt Street. In general, groundwater flow in the shallow overburden is to the east toward Salem Harbor. However, groundwater flow in the eastern portion of the Site is affected by the tides and flows in a westerly direction at certain tidal cycles. Therefore, migration of CVOCs to the off-site properties to the west are likely from the tidal changes and utility preferential pathways. The source of oil and/or hazardous material (OHM) contamination was eliminated when the former industries who released CVOCs into the environment ceased operations, likely by the 1970s or 1980s. A specific source or sources of OHM have not definitively been identified. Since the releases of CVOCs have occurred more than 50 years ago,the CVOCs in groundwater have reached a steady state. To mitigate the vapor intrusion pathway, in 2022, seven sub-slab depressurization systems (SSDSs) were installed at Building 4 located within the Subject Property, and, in 2024, an SSDS was installed at 40 and 44 Pingree Street and 78 Palmer Street. AULs are required for Building 4 at the Subject Property,40 Pingree Street,44 Pingree Street and 78 Palmer Street to ensure the SSDSs remain operational to mitigate the vapor intrusion pathway. AULs are also required at 16 Pingree Street and 85 Leavitt Street to ensure that the building slabs remain intact to prevent migration of soil gas to indoor air. Once the AULs are signed and recorded with the deed,these properties will be eligible for a Permanent Solution. With the operation of the SSDSs where necessary, it is confirmed that there are no current risks to human health and no current or future risks to public welfare, the environment or safety at the Disposal Site, with the exception of the Global Tots Childcare location and the 32 Pingree residence. For the Global Tots childcare location, an additional heating season indoor air sample is required at this location to further evaluate conditions. For the 32 Pingree residence, an SSDS system will be installed to mitigate a Critical Exposure Pathway. Per 310 CMR 40.1050 of the MCP, a Temporary Solution applies to this portion of the Disposal Site since: • A condition of No Substantial Hazard exists; • All sources of oil and/or hazardous materials (OHM) have been identified, characterized,and to the extent feasible, eliminated or controlled; • The level of OHM in the environment has been reduced to as close to background levels as feasible; • Control of plumes of dissolved OHM and groundwater and vapor phase OHM in the vadose zone has been achieved to the extent feasible;and Partial Temporary Solution Statement PARTNER 45 Congress Street,Salem, Massachusetts August 21,2025 Page 30 l£a6ed SZOZ 'LZ;sn6ny H3NiHVd s;;asnpesseW 'wades';aaJ;S ssaJ6uoD Sq ;uawa;e;S uoi;njoS lueaodwal leiIJed -uoi;nIoS;uauewJad e piemo; panui;um aq llegs pue algiseal aie uoi;nIoS ;ueuewiad a anaiyae o; suoipe asuodsod Legend and Notes: �.% ,�=•, Shallow Soil Boring and Monitoring Well Location ® Deep Overburden Soil Boring and Monitoring Well Location ® Bedrock Monitoring Well Location / ® Temporary Monitoring Well Location Soil Boring and/or Temporary Monitoring Well Location / Salem Harbor _�� Historic Fill Sample Location Disposal Site Boundary for RTN 3-35818_____ (dashed where inferred) J ®B/MW204 Eil Earthen Area Self Storage Units xvwwaFwwwNxw1Fx11wxAA0 ® Water Body ® F10 MW318 ® Building 4 B/MW313® I Water Supply Line ®B/MW321 B/MW311 I / ! I Storage Area 2 - ; ®B320 i a I Sewer Main l HF9 o' Storm Water i ( ®B/MW319 B/MW310 Natural Gas C� BJMW207 B/MW205 I t !aB5 0 r..�.. �'4 4 - i .' 4'4'49". 7+.:4444 ®� •¢ - Storage Area 3. rI' Y 7 B6 . / TWW303, Large Vacant Room FB ~C Former Aquaculture Area II '.� , B/MW314 ',Storage Area45outh /�p I 4 i Storage Area 1 % B/MW324 BBa — _.®' u . t /MW312—� ®B3 I L B/MW316® 1 �� 19B/MW317 r rv . L Storage Area 4 North. = �_ I C u U Ll y J` g \ 11N B �C1 � - MW3 ewer#1 ewe 2 i ®HF7 I 1 - �' - Palmer Cove B/MW 213® -; ' F, ® $ _ g/MW 209�B/MW703 : a% 8g/MW206 B/MW201 I 6 - $/MW202 > ®13/MW104 I 0 B1 _ B2 0 B/MW203 ED 1 ®HF3 B203 t FIT �. +- Parking Garage •- nuance v e - O �. = J ®B/MW211 i B/®101 ®B/MW100 ®HF4 e °o 16 �T� =5`� i 1 �r HF6_ W-µ 1 a 1 @ N I 6 W-406 i _ - ��_ ®B/MW-405 ®HFZ HFS B/MW21'2® B/MW-2'i0® z — N v P=I N=G R-E �-- 5� �-E - ul 78 85 Leavitt n s 20 22 i Rat 70' o' 70' N 0 14 .16 18 H 44 1I N %32, Harbor Sweets � rn Ln E I Approximate Scale rn ` a, 7 w 76 d Shop) Yacht Pp °t•- > Club — m a r IJ £ a m � Z y rev gg > m P- 29 ® ® ® I I I Title: J Site Plan PERKINS STREET r� Figure: Prepared By: Date: Project Number: b'I I M I 2 q� July 2025 19298406-EN Address: 45 Congress Street Salem' Massachusetts NER II - 1 'CONGR-E55_STREET� �w Engineering and Science Inc: i`� 1�