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1 COURAGEOUS COURT PIN, PHASE I ISI, TIER II CLASSIFICATION REPORT RECEIVE® ENVIRONMENTAL C O N E C O �/ l ; 5 Engineers & Scientists OCT 22 202 CIVIL CITY OF SALEM October 14, 2025 BOARD OF HEALTH Coneco Project No. 12873.002 Sara Moore, Board of Health Chair City of Salem 98 Washington Street Salem,Massachusetts 01970 RE: Public Involvement Notification Phase I Initial Site Investigation and Tier H Classification Report Non-PCB Mineral Oil Dielectric Fluid Release Pad-Mounted Electrical Transformer 1 Courageous Court Salem,Massachusetts Release Tracking Number 3-50926 Dear Ms. Moore: Pursuant to 310 CMR 40.1403 of the Massachusetts Contingency Plan(MCP),the following serves as written notification of the submittal of a Phase I Initial Site Investigation and Tier 11 Classification Report. This submittal is regarding a release of non-polychlorinated biphenyl (PCB)mineral oil dielectric fluid(MODF)from a pad-mounted electrical transformer located at the above-referenced location. A copy of the above-referenced report will be available for viewing on or about October 9, 2025, at the Massachusetts Department of Environmental Protection(MassDEP)Northeast Regional Office in Woburn,Massachusetts. A copy of this report may also be obtained by contacting the undersigned in writing. A copy of the Phase I Initial Site Investigation summary of findings and conclusions is appended to this notice. A legal notice regarding this release will be published in The Salem News on or about October 14,2025. A copy of this notice is included with this letter. A copy of the Disposal Site Plan is also attached for reference. Additional Public Involvement Activities may be requested pursuant to 310 CMR 40.1403(9). This submittal is being made on behalf of Massachusetts Electric Company,the party conducting response actions relating to this release. If you have any questions,please contact the undersigned. Respectfully Submitted, Coneco Engineers& Scientists, Incorporated Camille L.Billetter ZAMarc E. rochu, LSP Project Scientist Senior Project Manager Enclosures: Copy-Phase I Initial Site Investigation Summary of Findings and Conclusions Copy-Notice of Initial Site Investigation and Tier II Classification Disposal Site Plan cc: MassDEP-NERD Massachusetts Electric Company 4 First Street, Bridgewater,MA 02324 (508)697-3191 (800)548-3355 Coneco.com Summary of Findings and Conclusions of Phase I Initial Site Investigation Non-PCB Mineral Oil Dielectric Fluid Release Pad-Mounted Electrical Transformer 1 Courageous Court Salem,Massachusetts Release Tracking Number 3-50926 Conditions of the area impacted by the historical release of non-PCB MODF from a 150 kVA pad- mounted electrical transformer formerly in use at 1 Courageous Court in Salem,Massachusetts were evaluated in a manner consistent with applicable guidelines for a Phase I-ISI as presented in 310 CMR 40.0480 of the MCP. Response actions performed in association with RTN 3-50926 included a review of pertinent Disposal Site history,the removal of approximately 3 cubic yards of remediation waste, and the collection and laboratory analysis of soil samples. Based on the information and observations described herein,the following is a summary of the investigation findings: Based on the information and observations described herein,the following is a summary of the investigation findings: • On June 13, 2024, MECO was informed of a power outage at Courageous Court in Salem, Massachusetts. At that time, MECO identified staining indicative of a historical release of MODF that had occurred from a 150 kVA pad-mounted electrical transformer in use at that time. Coneco visited the Site and observed approximately 75 square-feet of surficial staining along the concrete transformer pad, landscaped grass,and underlying soil. No indication of a sudden release of MODF greater than the applicable RQ was observed by MECO or Coneco. • Original manufacturer's nameplate information present on the 150 kVA pad-mounted electrical transformer indicated that the MODF associated with the transformer contained less than 1 ppm PCBs at the time of manufacture. Therefore,MODF contained within the transformer was characterized as"non-PCB"pursuant to 40 CFR 761.3 and 310 CMR 40.0000. • In order to eliminate the source of the release and stabilize environmental conditions at the Site, MECO de-energized and removed the leaking transformer(i.e.,eliminated release source)on June 14,2024. • Following removal of the leaking pad-mounted electrical transformer,remedial actions were performed, including the cleaning of the concrete transformer pad and excavation of impacted soil located beneath and adjacent to the concrete transformer pad under an LRA. The final dimensions of the remedial excavation completed on June 14,2024,measured approximately 36 linear feet around the perimeter of the concrete pad,and extended to 1 to 4 feet deep. All impacted surficial soil was removed from the release area during initial response actions on June 13 and 14,2024. The LRA excavation was discontinued prior to reducing non-PCB MODF concentrations in soil to levels consistent with or approaching natural background conditions due to spatial and logistical constraints and customer electrical demands. • A total of nine confirmatory soil samples(CS-01 through CS-09)were collected from the base and sidewalls of the LRA excavation area to define in-situ soil conditions at the completion of soil removal activities. • On June 14,2024, approximately 3 cubic yards of impacted media were removed as part of LRA activities. Due to Disposal Site constraints and limitations at the time of LRA excavation activities, impacted soil located along the eastern and western sides and below the transformer pad could not be remediated to achieve or approach Background conditions at that time. • Based on laboratory analytical results for post-remedial excavation soil samples,which exhibited EPH concentrations in excess of the applicable MCP RCS-1 RCs,release conditions represented an MCP 120-day reportable condition, as defined in 310 CMR 40.0315(2). A BWSC-103: 120-Day Release Notification Form was submitted to MassDEP on October 7, 2024. MassDEP assigned RTN 3-50926 to the subject non-PCB MODF release. • No impacts to drinking water, indoor air, or surface water have been identified or are expected to occur as a result of the subject release. • The release occurred from a point source at a residential property. The potential routes for human exposure include inhalation, ingestion, and/or dermal contact with soil during activities such as landscaping, utility maintenance,or construction conducted within the limits of the Disposal Site. • No off-Site migration pathways have been identified at the Disposal Site; however, further assessment of potential pathways may be performed as part of ongoing response actions. Based on Disposal Site conditions,potential human exposure is considered unlikely except by utility workers performing subsurface construction or maintenance activities on the transformer within the Disposal Site boundary. • Based on current Disposal Site conditions,no conditions warranting an IRA are present; therefore,an IRA condition is not present. Future remedial actions will be conducted under a Release Abatement Measure(RAM)and/or as part of Comprehensive Response Actions. NOTICE OF PHASE I INITIAL SITE INVESTIGATION AND TIER II CLASSIFICATION Non-PCB Mineral Oil Dielectric Fluid Release Pad-Mounted Electrical Transformer 1 Courageous Court Salem, Massachusetts Release Tracking Number 3-50926 A release of oil and/or hazardous material has occurred at this location, which is a disposal site as defined by M.G.L. c. 21 E, § 2 and the Massachusetts Contingency Plan, 310 CMR 40.0000. To evaluate the release, a Phase I Initial Site Investigation was performed pursuant to 310 CMR 40.0480. As a result of this investigation, the site has been classified as Tier II pursuant to 310 CMR 40.0500. On or about October 9, 2025, the Massachusetts Electric Company filed a Tier Classification Submittal with the Department of Environmental Protection (MassDEP). To obtain more information on this disposal site, please contact Marc E. Brochu, LSP, Coneco Engineers & Scientists, Incorporated, 4 First Street, Bridgewater, Massachusetts, 02324, (508) 802-2014. The Tier Classification Submittal and the disposal site file can be reviewed at the MassDEP Northeast Regional Office, 150 Presidential Way, Woburn, Massachusetts, 01801, (978) 694-3200. Additional public involvement opportunities are available under 310 CMR 40.1403(9) and 310 CMR 40.1404. NOTE: THE LOCATION AND DIMENSIONS OF THE SUBJECT ASPHALT-PAVED PROPERTY AND VICINITY PARKING LOT FEATURES ARE APPROXIMATE r GRANITE CURBING AND BASED UPON CONECO FIELD OBSERVATIONS. 1 COURAGEOUS COURT BUILDING APPROXIMATELY 10 FEET b—G G--'-6-6-6-6 —G { -- _. CS-02 E�E 71 ROCKS C5' - --r--- i - I �I• ` - C I' - ASPHALT-PAVE DS-09 ROCK PARKING LOTL09 DUITWOODED AREA SHRUBBERY OUTS C-08 CS-01 CS04 CS-07 X X— - � x x x _ x CS-03 -X X X WOODED AREA 0 4' 8' LEGEND SCALE: 1" = 4' DISPOSAL SITE BOUNDARY APPROXIMATE LIMITS OF SURFICIAL STAINING DRAWN CHECKED NON-PCB MODF RELEASE APPROXIMATE LIMITS OF �� PAD-MOUNTED ELECTRICAL TRANSFORMER EXCAVATION _._.. UNDERGROUND ELECTRICAL C O N E C O BY WCB 11EB 1 COURAGEOUS COURT LINES SALEM, MASSACHUSETTS UNDERGROUND GAS LINES ,,, Engineers&SCientists DATE 9/4/24 9/20/24 CS-01 CONFIRMATORY SOIL SAMPLE � - '� �^'��•^^ • LOCATION AND IDENTIFICATION PROJECT NO. 12873.001 FIGURE 3 - DISPOSAL SITE PLAN