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HomeMy WebLinkAboutMiscellaneous - 145 TURNPIKE STREET 2/17/2015 L C O N E C O I �.f>r U irAr Engineers & Scientists Su w[' Y February 17,2015 i.- Coneco Project No. 8145N h Mr.Thomas Trowbridge,Chairman Town of North Andover Health Department 1600 Osgood Street,Building 20;Unit 2035 North Andover,MA 01845 RE: Public Involvement Notification Phase I Initial Site Investigation and Tier Classification Non-PCB Mineral Oil Dielectric Fluid Release Pad-Mounted Electrical Transformer 145 Turnpike Street North Andover,Massachusetts Release Tracking Number 3-31980 Dear Mr.Trowbridge: 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 Classification Report. This submittal is regarding a release of non-polychlorinated biphenyls(PCB)mineral oil dielectric fluid(MODE)from a pad-mounted electrical transformer located at the above-referenced location. A copy of the above-referenced report will be available for viewing after February 17,2015 at the Department of Environmental Protection Northeast Regional Office(DEP-HERO)in Wilmington,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 su nmary of findings and conclusions is appended to this notice. A legal notice regarding this release will be published in the Eagle Tribune on or about February 23, 2015. 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 the Massachusetts Electric Company d/b/a National Grid,the party conducting response actions relating to this release. If you have any questions,please contact the undersigned. Respectfully Submitted, Coneco Engineers&Scientists,Incorporated 11A�effrey S.Hunter John .Aevazelis Senior Project Manager Seni r Project Manager ZEB:JSH:JDA:BFK;jd Z:\\8145N.Muil.Phasel.Tierl.2.17.15.doc Enclosures: Copy-Phase I Initial Site Investigation Summary of Findings and Conclusions Copy-Notice of Initial Site Investigation and Tier I Classification Disposal Site Plan cc: DEP-HERO Massachusetts Electric Company 4 First Street,Bridgewater,MA 02324 (508)697-3191 (800)548-3355 j .. ................. .__ _.. _..... _ . __.............. Bridgewater,MA Chelmsford,MA www.conoco.com Auburn, MA Glastonbury,CT I Summary of Findings and Conclusions of Phase I Initial Site Investigation Non-PCB Mineral Oil Dielectric Fluid Release Pad-Mounted Electrical Transformer 145 Turnpike Street North Andover,Massachusetts Release Tracking Number 3-31980 Conditions of the area impacted by the sudden release of approximately 42 gallons of non-PCB MODF from a 300 kVA pad-mounted electrical transformer located at 145 Turnpike Street in North Andover,Massachusetts were evaluated in a manner consistent with applicable guidelines for a Phase I Initial Site Investigation as presented in the MCP, 310 CMR 40.0000. Response actions performed in association with RTN 3-31980 include a review of pertinent Site history, the excavation of impacted soil,the advancement of three(3)Geoprobe®test borings, 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: • On February 16, 2014 a sudden release of non-PCB MODF from a 300 kVA pad-mounted electrical transformer was identified at the Site due to vehicular impact. Based on the reported quantity of MODF released at the Site(initially estimated by MECO personnel to be approximately 90 gallons), a situation representing a 2-hour reportable condition as described in 310 CMR 40.0311(3)was identified. On behalf of MECO, Coneco notified the DEP- NERO of the release conditions within two hours of the identification of a reportable condition in accordance with the specifications of 310 CMR 40.0332 and RTN 3-31980 was assigned. • Original manufacturer's nameplate information present on the damaged transformer indicated that the MODF within the transformer contained no concentrations of PCBs in excess of 1 ppm at the time of manufacture. As such,MODF associated with the transformer is characterized as "non-PCB" in accordance with 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 personnel de-energized and removed the damaged transformer on February 16, 2014. Prior to removal, CHESI personnel drained the remaining MODF from the transformer using a Cusco vacuum tank truck. CHESI personnel recovered approximately 132 gallons of MODF from transformer; based on the 174-gallon capacity of the damaged transformers and the volume of MODF, the estimated volume MODF released at the Site was revised to approximately 42 gallons. • Initial IRA activities were conducted at the Disposal Site between February 16 and 17, 2014, and consisted of the excavation and proper disposal of impacted media located around the perimeter of the concrete transformer pad. Based on visual and olfactory observations made at the time of initial IRA activities, Coneco noted that non-PCB MODF had migrated to soil located beneath the concrete transformer pad via an electrical conduit cutout in the concrete pad. Due to customer energy demands, it was determined by MECO personnel that removal of the concrete pad and continued excavation activities were not feasible at that time. As such, initial response actions were terminated. • Upon completion of initial IRA activities, Coneco personnel composited discrete soil samples representative of the excavation area into four confirmatory soil samples, designated CS-01 through CS-04,which were submitted to Spectrum for laboratory analysis of EPH carbon fractions by the DEP Method. Results of laboratory analysis indicated that elevated concentrations of EPH carbon fractions in excess of the applicable Method 1 Risk Characterization standards remained beneath the pad-mounted electrical transformer. • As a result of initial IRA activities conducted between February 16 and 17,2014, a total of approximately 8 cubic yards of recovered non-PCB MODF and impacted media consisting of snow,trap rock, absorbent material, geotextile fabric, and soil,was generated at the Disposal Site. The remediation waste, as well as non-PCB MODF recovered from the transformer, was contained with the Cusco vacuum truck and transported on February 17, 2014 by CHESI under Uniform Hazardous Waste Manifest to the Clean Harbors of Braintree facility for proper disposal. • On April 17,2014, Coneco provided oversight for the advancement of three(3)Geoprobe® test borings, designated SB-1 through SB-3,to delineate the extent of potential impacts associated with the release of non-PCB MODF at the Disposal Site. Shallow refusal (on presumed bedrock)was encountered in all three boring locations. Groundwater was not observed prior to encountering refusal; therefore, groundwater monitoring wells were not installed and groundwater samples could not be collected. No visual or olfactory evidence of OHM impact were noted during pre-clearance or soil boring activities. • Select soil samples collected on April 17, 2014 from test borings SB-1 through SB-3 were submitted to Spectrum for laboratory analysis of EPH carbon fractions by the DEP Method. Results of laboratory analysis identified no concentrations EPH carbon fractions in excess of the laboratory detection limits, which are below the applicable Method 1 Risk Characterization Standards. • The results of a Method 1 Risk Characterization performed for the Disposal Site indicate that a condition of"No Significant Risk"does not currently exist for soil at the Disposal Site. Therefore, additional response actions are required to achieve a condition of"No Significant Risk"for soil at the Disposal Site. • No current or potential off-Site migrations pathways have been identified at the Disposal Site. Based on Disposal Site conditions,potential human exposure is considered unlikely. • Based on current Disposal Site conditions,IRA activities will be continued in accordance with the IRA Plan submitted to the DEP-NERO on April 17, 2014. NOTICE OF PHASE I INITIAL SITE INVESTIGATION AND TIER I CLASSIFICATION Non-PCB Mineral Oil Dielectric Fluid Release Pad-Mounted Electrical Transformer 145 Turnpike Street North Andover, Massachusetts Release Tracking Number 3-31980 A release of oil and/or hazardous materials 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 I pursuant to 310 CMR 40.0500. On February 17, 2015, 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 Brian F. Klingler, P.G., L.S.P., Coneco Engineers& Scientists, Incorporated, 4 First Street, Bridgewater, Massachusetts, 02324, (508) 697-3191. The Tier Classification Submittal and the disposal site file can be reviewed at the MassDEP Northeast Regional Office, 205B Lowell Street, Wilmington, Massachusetts, 01887, (978) 694-3200. Additional public involvement opportunities are available under 310 CMR 40.1403(9)and 310 CMR 40.1404. f, E 16 N7 a � ' W z W d' W v2 z LL. E'��W ° W E-4 Q H G4�WW z aUZGa z M > d, , W ,_ z ° I h. L) O m 99 a N I a 14 a w Z El ml ,Z wmw 0 P4 { I I zW N N �s J Z CL 4 n o 0 I C; Z f y' a 9ti I ( y W rJ U ........_._., 0 ° W 2 N L1...� Y SEE�. .: �_..:.:...: �,._.:.. " ... ._...._. 1,..:_..._.. _. .. _ _... O ....... 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