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24 FORT AVENUE PIN t RECEIVEDENVIRONMENTAL CO N E C O ECOLOGICAL SURVEY Engineers & Scientists O C T 2 2 2026 CIVIL CITY OF SALEM October 13,2026 BOARD OF HEALTH Coneco Project No. 5650.102.014 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 23 kV Rebuild Project-Power Bank Transformer Area Salem Harbor No. 45 Substation 24 Fort Avenue Salem,Massachusetts Release Tracking Number 3-52582 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 II Classification Report for the Salem Harbor No. 45 Substation property located at 24 Fort Avenue in Salem,Massachusetts. A copy of the above-referenced report will be available for viewing on or about October 13, 2026, 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 13, 2026. 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 New England Power 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 Nicholas R. Holtgrefe Brian gler,PG,LSP Project Manager Principal Geologist 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 New England Power 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 23 kV Rebuild Project-Power Bank Transformer Area Salem Harbor No. 45 Substation 24 Fort Avenue Salem, Massachusetts Release Tracking Number 3-52582 Conditions of the Disposal Site located at the Salem Harbor No.45 Substation, having an address of 24 Fort Avenue 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. Coneco has conducted a subsurface assessment to evaluate soil quality at the Disposal Site. Investigations at the Disposal Site included a review of pertinent Site history,the advancement of eighteen test pits,the collection and laboratory analysis of soil samples from the Disposal Site,and performance of RAM activities undertaken to facilitate substation construction activities at the Disposal Site. Based on the information and observations described herein,the following is a summary of the investigation findings: • Prior to proposed construction activities at the Site to facilitate substation upgrades,NEP contracted Coneco to perform pre-characterization activities within the proposed construction area to determine if response actions would be necessary in accordance with applicable state and/or federal regulations. Subsurface investigation activities conducted in May and June 2025 included the advancement of eighteen(18)test pits and collection of soil samples. • Analytical results for select soil samples indicated that TPH, lead, and PCBs were above the applicable RCS-2 reportable concentration. Therefore,conditions at the Site constituted a 120-day MassDEP Reportable Condition pursuant to 310 CMR 40.0315(1). In accordance with 310 CMR 40.0333(2), a Release Notification Form(BWSC-103)was submitted to MassDEP on October 10,2025, and RTN 3-52582 was assigned to the release condition. • On November 24, 2025,on behalf of NEP, Coneco submitted a RAM Plan to MassDEP detailing proposed RAM activities to facilitate substation construction activities. RAM activities conducted since November 2025 were documented in RAM Status Reports No. 1 and 2, submitted to MassDEP and dated March 24 and September 24,2026, respectively. • Coneco conducted additional soil sampling activities from the RAM excavation area between February and March 2026. Laboratory analysis of the soil samples did not identify any concentrations of lead or TPH in excess of the applicable MassDEP Method 1 S-2/GW-3 Risk Characterization Standards in the submitted soil samples. • As a result of RAM excavation activities conducted to date,a total of 99.45 tons (approximately 65 cubic yards)of soil generated during excavation activities within the RAM excavation area were loaded into dump trailers and transported under MassDEP BOL to Clean Earth for treatment via thermal processing. • No continuing sources of contamination are present at the Disposal Site and no current or potential migration pathways have been identified at the Disposal Site. Based on Disposal Site conditions,potential human exposure is considered unlikely and the initiation of Immediate Response Action activities is not warranted. NOTICE OF PHASE I INITIAL SITE INVESTIGATION AND TIER II CLASSIFICATION 23 kV Rebuild Project - Power Bank Transformer Area Salem Harbor No. 45 Substation 24 Fort Avenue Salem, Massachusetts Release Tracking Number 3-52582 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 13, 2026, the Massachusetts Electric Company filed a Tier II Classification Submittal with the Department of Environmental Protection (MassDEP). To obtain more information on this disposal site, please contact Briar F. Klingler, P.G., L.S.P., Coneco Engineers & Scientists, Incorporated, 4 First Street, Bridgewater, Massachusetts, 02324, (508) 697-3191. The Tier II 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. I DISPOSAL SITE BOUNDARY 5 � 7..�, ,; Lam: :,'1• , • ' , 1 4+� . ,. ,C -tip SEE FIGURE 4 FOR BANK 3 INSET 1,N — O ' N �' • 7y N : / v r v N •�_ i 0 50 1CC t a SCALE: 1" = 50' N DRAWN CHECKED SALEM HARBOR NO. 45 SUBSTATION 23 IiV REBUILD PROJECT BY BAB NRH 24 FORT AVENUE N C O N E C O SALEM, MASSACHUSETTS Engineers & Scientists DATE 10/2/2026 10/2/2026 RELEASE TRACKING NUMBER 3-52582 o www.coneco.com PROJECT NO. 5650.102.014 FIGURE 3 — DISPOSAL SITE PLAN cA 0 — I j THIS DOCUMENT IS INTENDED FOR GENERAL PLANNING Sc INFORMATION PURPOSE_ ONLY. ALL MEASUREMENTS & LOCATIONS ARE APPROXIMATE. x ❑ ❑ ❑ ❑ xc TRENWA x i FMR—BANK3—CS-02 S FMR—BANK3— FMR—BANK3— ? CS-05 A CS-04 r� FMR—BANK3—CS-06 � x FORMER 3 BANK C x jTRANSFORMER L' BANK3 CS— — — FMR 01 ' FMR—BANK3—CS-03 I FMR—BANK3—CS-09/CS-10 x FMR—BANK3—CS-11/CS-12 FORMER 13 BANK B TRANSFORMER x FMR—BANK3 LEGEND —CS-07/CS-08 DISPOSAL SITE BOUNDARY EXTENT OF SOIL DISTURBING ACTIVITIES DURING CURRENT REPORTING PERIOD ' I X CHAIN LINK FENCE I I I I I I TRAIN TRACKS ❑ CONCRETE FOUNDATIONS FORMER 3 BANK A x FMR—BANK3—CS-01 CONFIRMATORY SOIL SAMPLE TRANSFORMER ; LOCATION AND IDENTIFICATION 0 15' 30' I I SCALE: 1" = 15' x DRAWN CSECKED SALEM HARBOR NO. 45 SUBSTATION / 23 KV REBUILD PROJECT sY ECM NRH 24 FORT AVENUE C O N E C O SALEM, MASSACHUSETTS Engineers do Scientists DATE 3/10/26 3/13/26 RELEASE TRACKING NUMBER: 3-52582 PHOW- HOD-54a-3M YEMRE: PROJECT N0. 5650.102.014 FIGURE 4 — DISPOSAL SITE PLAN BANK 3 INSET S:\Salem MA--Salem No 45 Sub-24 Fort Ave\5650.102 — 23kV Rebuild & Transformer Replacement Project\Task 14 — State and Federal Environmental Regulatory Reporting\Figures\5650.102.014—Fig3_Site—Plan.dwg