green mountain power corporation

January 28, 2016Project No. 08-224345.00

Mr. John GreenanGreen Mountain Power Corporation2152 Post RoadRutland, VT 05701

Re: Initial 2015 Soil Sampling ResultsGraniteville Substation #35719 Graniteville Road, Barre Town, VT

Dear Mr. Greenan,

Environmental Compliance Services (ECS) is pleased to submit this summary report presenting theresults of the initial characterization of shallow subsurface conditions and building materials at the GreenMountain Power Corporation (GMP) Graniteville #35 Substation (Site) located at 719 Graniteville Roadin Barre Town, VT (Figure 1). This substation is being renovated and the building demolished as part ofthe proposed Graniteville Substation Upgrade project in 2016.

The purpose of the initial subsurface characterization is to determine if soil and building materials havebeen impacted by leakage from oil-filled electrical equipment. Potential contaminants of concernassessed in soil during the investigation were selected based on the historical site use as an activesubstation and included: total petroleum hydrocarbons (TPH) diesel range organics (DRO) by EPAMethod 8015C, polychlorinated biphenyls (PCBs) by EPA Method 8082 following extraction by EPAMethod 3540C, semi-volatile organic compounds (SVOCs) polycyclic aromatic hydrocarbon (PAH)fraction by EPA Method 8270D, and 8 Resource Conservation and Recovery Act (RCRA)-listed metalsby EPA Method 6020. Building samples were analyzed for PCBs only. Asbestos and lead paintsampling was being performed under separate contract with Clay Point Associates. Soil and buildingmaterials samples were submitted to Eastern Analytical, Inc. of Concord, New Hampshire under chain ofcustody protocol for analysis.

Table 1 presents a summary of laboratory results for eleven shallow soil samples (including background),one concrete pad sample, and seven building materials samples (concrete and brick) at the substation.The substation was temporarily de-energized between approximately 4 to 6 pm on December 7, 2015 as aprecautionary measure to provide safe sample collection. All soil sample laboratory results werecompared to the U.S. Environmental Protection Agency (EPA) Regional Screening Levels (RSLs) datedNovember 2015 for Industrial Soils and Vermont Department of Health (DOH) standards, if available.

The substation yard is mostly grassy with a gravel drive from Graniteville Road into the substation andunder the wooden structure. Composite soil samples were strategically located around the substationyard based on drainage areas, dead vegetation, and potential for historical storage of electrical oil-filledequipment (such as within the wooden structure and around the concrete pad) to a depth ofapproximately 0-0.5 feet bgs. One discrete soil sample was collected at a seep within the substationwhere sheening was observed. The historical configuration of oil-filled equipment at the substation isunknown.

Mr. John GreenanGreen Mountain Power Corporation

January 28, 2016

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Composite soil samples were collected from the east and west sides of the transformer pad, located westof the building. Composite samples consisted of three of four grab samples, placed in a ziplock baggie tobe homogenized before being transferred to laboratory-supplied 4-oz jars. One composite sample wascollected from the concrete pad west of the building. This sample as collected with a chisel from the topsurface within ½ inch.

Concrete samples within the substation building were collected utilizing a hammer drill bit to grindapproximately ½ inch into the concrete and the powder was placed with a disposable scoopula into alaboratory-supplied 4-oz jar. Samples were targeted around staining observed near transformer andbreaker locations. The brick sample was collected with a chisel. Approximate sample locations areshown on the Site Plan in Figure 3. All non-disposable sampling tools were decontaminated betweensample locations with an alconox scrub, fresh water rinse, hexane wipe and distilled water rinse.

Based on the results of soil and concrete sampling at the Graniteville substation, leakage from oil-filledequipment has impacted soil and concrete at the substation. Several soil samples exceed at least one ofthe State of Vermont’s soil screening values (SSVs) for industrial sites, including SS1 and SS2 near theconcrete pad and SS9 and SS10 located south of the building in the substation yard. Near the concretepad and at SS9, elevated levels of certain PAHs, lead and TPH were detected. PCBs were detected in sixsoil samples, with PCB concentrations ranging from 0.061 milligrams per kilogram (mg/Kg) to 1.2mg/Kg. TPH concentrations were detected in several soil samples, ranging from 16 mg/Kg to 1,300mg/Kg at SS2. Arsenic concentrations in this data set range from 2.8 mg/Kg to 7.1 mg/Kg, with thebackground soil sample at 4.7 mg/Kg. The EPA RSL standard for arsenic is 3.0 ppm for industrial sites;however, the State of Vermont considers values less than 10 mg/Kg to be indicative of naturallyoccurring concentrations. With the exception of lead, no other RCRA 8 metals were detected above theindustrial RSLs.

PCBs were detected in six of the seven building samples, ranging from 0.15 mg/Kg under the breakersamples to 2.0 mg/Kg at BT2-concrete. No PCBs were detected from the concrete sample collected nearthe northern door of the building (Bdoor-concrete). Laboratory results are summarized on Table 1.

Summary of Results and Disposal Recommendations

Based on the results of soil and concrete sampling at the Graniteville #35 substation, ECS offers thefollowing summary of results and recommendations for disposal of contaminated materials.

• Arsenic concentrations in this data set range from 2.8 mg/Kg in soil at SS6 to 7.1 mg/Kg in SS9.Arsenic in the background sample was detected at 4.7 mg/Kg. The EPA RSL standard forarsenic is 3.0 ppm for industrial sites; however, the State of Vermont considers values less than10 mg/Kg to be indicative of naturally occurring concentrations.

• Lead was detected above the RSL for industrial soils at SS1 and SS2, located near the concretepad west of the building, at concentrations of 6,000 mg/Kg and 35,000 mg/Kg respectively.Additional characterization of lead in soil in this area is recommended to define limits and extentand determine toxicity characteristics (TCLP analysis) for disposal.


January 28, 2016

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• Several PAHs were detected in soil above the industrial RSL values at SS9. Benzo(a)pyrene wasdetected over industrial RSL values in SS1, SS2, and SS10. PAHs are present in most soilsamples at concentrations above the residential RSLs.

• TPH DRO concentrations were detected in two soil samples above the industrial RSL of 440mg/Kg at 1,300 mg/Kg in SS2 and 510 mg/Kg in SS9.

• A seep or possible drainage discharge area suggests groundwater could be fairly shallow. Soilsnear an observed seep within the substation yard at SS10 are impacted. Impact to groundwaterwill be evaluated during removal activities. If evidence of soil contamination is observed at thewater table, then groundwater testing may be recommended.

• PCBs were detected in six of the ten soil sample locations and six of the seven building materialssamples. Following the Environmental Protection Agency’s guidance, one soil sample and twoconcrete samples contained PCBs in excess of the EPA’s high occupancy standard of 1 part permillion (ppm). Given the anticipated age of the substation (<1978) and lack of documentationregarding PCB concentrations in transformer oil used historically in substation equipment,disposal of material from this substation should comply with the requirements of 40 CFR 761.

• GMP proposes to remove PCB contaminated materials from the substation and profile fordisposal at a TSCA approved disposal facility or a RCRA hazardous waste landfill in accordancewith the requirements of 40 CFR 761 (such as Waste Management’s Model City Landfill in NY).Following removal of this material, verification samples will be collected to ensure PCB cleanupgoals are achieved. Any remaining material proposed for removal from the substation will beprofiled for disposal at Casella’s Waste USA landfill in Coventry, VT to achieve RSLs forPAHs, metals, and TPH.

ECS recommends that this report be submitted to Mr. Gerold Noyes at the Vermont Department ofEnvironmental Conservation (VT DEC) Sites Management Section due to the presence of compoundsabove applicable standards. The EPA Region 1 Coordinator should be notified of the presence of PCBremediation waste at the Graniteville Substation for authorization to conduct a self-implementing clean-up and disposal plan.

This investigation was prepared exclusively for GMP and was undertaken to assess specificenvironmental conditions on the subject property as presented in the work plan prepared by ECS.Analytical assessment and testing locations were selected in accordance with generally acceptedengineering and environmental assessment practices within the substation. No other warranty, express orimplied, is provided with respect to any location not assessed, tested or analyzed. Absolute assurancethat any and all possible contamination at the site has been identified cannot be provided.


January 28, 2016

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Please contact us if you have any questions or comments about the report at 802-241-4131.

Sincerely,ENVIRONMENTAL COMPLIANCE SERVICES, INC.

Laura L. Woodard Joseph J. Hayes, C.P.G., P.G.Sr. Project Manager Branch Manager

Attachments: Figure 1 – Site Location MapFigure 2 – Site Plan with Soil Sample LocationsFigure 3 – Building Plan with Sample LocationsTable 1 – Initial Soil and Building Material Sample ResultsPhotodocumentationLaboratory Report

Environmental Compliance Services, Inc.

www.ecsconsult.comGMP Graniteville Substation719 Graniteville RoadGraniteville, VT 05654 Figure 1: SITE LOCUS

1 Elm Street, Suite 3

Waterbury, VT 05676

Phone 802-241-4131 Fax 802-244-6894

Base Map: U.S. Geological Survey; Quadrangle Location: Barre East, VT

Lat/Lon: 44 8' 54.63" NORTH, 72 28' 59.49" WEST - UTM Coordinates: 18 701280.9 EAST / 4891447.7 NORTH

Generated By: Carol Farrington

Outside

SS1 SS2 SS3 SS4 SS5 SS6 SS7 SS8 SS9 SS10 Duplicate BackgroundBT1-

concrete

BT2-

concrete

BT3-

concrete

BB1-

concrete

BB3-

concrete

Bdoor-

concrete

Bbrick-

Breakers

Concrete

Pad

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0-0.5' 0-0.5' 0-0.5' 0-0.5' 0-0.5' 0-0.5' 0-0.5' 0-0.5' 0-0.5' 0-0.5' 0-0.5' 0-0.5' 0-0.5' 0-0.5' 0-0.5' 0-0.5' 0-0.5' 0-0.5' 0-0.5' 0-0.5'

VT DOH

Guidance Residential Industrial

PCB (µg/Kg)

PCB-1254 0.24 0.97 <0.03 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 0.036 <0.03 0.059 0.036 NA <0.08 0.52 <0.08 <0.08 <0.08 <0.08 <0.08 <0.08

PCB 1260 0.24 0.99 0.061 1.2 <0.02 <0.02 <0.02 0.092 <0.02 0.065 0.13 0.12 0.062 NA 0.53 1.5 1.0 0.15 <0.08 <0.08 0.35 <0.08

PCB 1262 -- -- <0.03 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.03 <0.03 <0.03 NA <0.08 <0.08 <0.08 <0.08 0.15 <0.08 <0.08 <0.08

SVOC PAHs (mg/Kg) .

Naphthalene 1.53 3.8 17 0.12 0.043 <0.0008 0.0095 0.016 <0.0008 <0.0008 <0.01 3.5 0.022 <0.01 NA NA NA NA NA NA NA NA NA

2-Methylnaphthalene -- 240 3,000 0.21 0.025 <0.0008 <0.009 0.013 <0.0008 <0.0008 <0.01 2.4 0.014 <0.01 NA NA NA NA NA NA NA NA NA

Acenaphthylene -- -- -- 0.51 0.13 <0.0008 0.035 0.090 0.017 <0.0008 <0.01 0.61 0.038 0.028 NA NA NA NA NA NA NA NA NA

Acenaphthene -- 3,600 45,000 0.11 0.036 <0.0008 <0.009 <0.01 <0.0008 <0.008 <0.01 3.2 0.036 <0.01 NA NA NA NA NA NA NA NA NA

Fluorene -- 2,400 30,000 0.33 0.047 <0.0008 0.012 0.015 <0.0008 <0.0008 <0.01 3.6 0.045 0.015 NA NA NA NA NA NA NA NA NA

Phenanthrene -- -- -- 4.4 0.54 0.059 0.16 0.15 0.30 0.052 0.061 27 0.58 0.17 NA NA NA NA NA NA NA NA NA

Anthracene -- 18,000 230,000 0.43 0.16 0.016 0.038 0.056 0.010 <0.008 0.017 8.0 0.13 0.050 NA NA NA NA NA NA NA NA NA

Fluoranthene -- 2,400 30,000 3.5 0.74 0.079 0.37 0.42 0.30 0.11 0.14 23 0.82 0.36 NA NA NA NA NA NA NA NA NA

Pyrene -- 1,800 23,000 3.2 0.65 0.063 0.29 0.37 0.16 0.060 0.12 21 0.65 0.29 NA NA NA NA NA NA NA NA NA

Benz(a)anthracene -- 0.16 2.9 1.1 0.30 0.034 0.15 0.20 0.015 0.0082 0.065 12 0.32 0.15 NA NA NA NA NA NA NA NA NA

Chrysene -- 1.6 290 1.6 0.49 0.037 0.18 0.24 0.066 0.035 0.087 12 0.34 0.17 NA NA NA NA NA NA NA NA NA

Benzo(b)fluoranthene -- 0.16 2.9 1.7 0.57 0.046 0.23 0.31 0.058 0.029 0.12 12 0.40 0.21 NA NA NA NA NA NA NA NA NA

Benzo(k)fluoranthene -- 1.6 29 0.59 0.18 0.015 0.076 0.12 0.021 0.0082 0.042 4.1 0.14 0.070 NA NA NA NA NA NA NA NA NA

Benzo(a)pyrene 0.01 0.016 0.29 0.99 0.32 0.032 0.18 0.26 0.016 <0.008 0.083 9.1 0.31 0.16 NA NA NA NA NA NA NA NA NA

Indeno(1,2,3-cd)pyrene -- 0.16 2.9 0.92 0.35 0.026 0.14 0.22 0.023 0.0085 0.078 5.4 0.25 0.12 NA NA NA NA NA NA NA NA NA

Dibenz(a,h)anthracene 0.016 0.29 0.25 0.11 <0.0008 0.035 0.056 <0.0008 <0.0008 0.022 1.5 0.064 0.033 NA NA NA NA NA NA NA NA NA

Benzo(ghi)perylene -- -- -- 0.88 0.38 0.026 0.13 0.22 0.022 0.0084 0.083 4.7 0.23 0.11 NA NA NA NA NA NA NA NA NA

Metals (mg/Kg or ppm)

Arsenic -- 0.68 3.0 7.0 6.7 5.2 4.6 4.9 2.8 3.5 2.9 7.1 3.9 NA 4.7 NA NA NA NA NA NA NA NA

Barium -- 15,000 220,000 700 2,300 44 52 100 50 33 74 370 110 NA 74 NA NA NA NA NA NA NA NA

Cadmium 65.6 71 980 6.1 7.1 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 0.9 <0.5 NA <0.5 NA NA NA NA NA NA NA NA

Chromium (assume III) 34,500 120,000 1,800,000 170 49 23 26 27 12 13 22 31 19 NA 24 NA NA NA NA NA NA NA NA

Lead -- 400 800 6,000 35,000 10 20 50 13 7.9 25 650 53 NA 33 NA NA NA NA NA NA NA NA

Mercury -- 11 46 <0.1 0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 0.3 0.1 NA <0.1 NA NA NA NA NA NA NA NA

Selenium -- 390 5,800 0.7 1.0 <0.5 0.5 <0.5 <0.5 <0.5 <0.5 1.2 0.5 NA <0.5 NA NA NA NA NA NA NA NA

Silver -- 390 5,800 <0.5 0.6 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 NA <0.5 NA NA NA NA NA NA NA NA

TPH DRO C10-C28)

Unidentified oil -- 96 440 140 1,300 16 27 29 <8 <8 21 510 27 NA NA NA NA NA NA NA NA NA NA

Notes:

Metals by EPA Method 6010 (except Hg via method SW-7471)

TPH - total petroleum hydrocarbons by modified EPA Method 8100

ug/Kg - Microgram per Kilogram or parts per billion (ppb)

mg/Kg - Milligrams per Kilogram or parts per million (ppm)

ND - not detected to detection limit shown

NA - compound not analyzed

**There is no current RSL for Total Chromium; elevated Chromium levels should be speciated for Chromium III and Chromium VI.

Table 1 - Initial Soil and Building Sample Results

GMP Graniteville Substation #35

ECS Project No. 08-224345.00

Soil Sample ID

Analysis

Date

Depth (feet)

EPA RSLs - Nov 2015--

* = State of Vermont cleanup standard

--

ppm

ppm

-- -- -- -- ---- -- -- --

ppm

SVOCs - Semi-Volatile Organic Compounds by EPA Method 8270. PAH = Polycyclic Aromatic Hydrocarbons

RSL - EPA Region 9 Regional Screening Levels

Bold and yellow shaded values represent an exceedance of industrial RSL or Vermont industrial cleanup standard.

Bold and grey shaded values represent an exceedance of residential RSL or Vermont residential cleanup standard.

mg/kg or ppm

--

Substation Yard - Shallow Soil

--

0.12

Substation Building

---- -- -- -- ----

ECS 1/28/2016

PHOTOGRAPHIC LOG Environmental Compliance Services, Inc.1 Elm St., Suite 3

Waterbury, Vermont 05676Client Name:Green Mountain Power Corp

Site Location:Graniteville Substation #35

ECS Project #:08-224345.00

Photograph #1Description:View of theGranitevilleSubstation from thenorth, lookingapproximately south.

Photograph #2Description:Substation buildinglooking northwest.




ECS Project #:08-224345.00

Photograph #3Description:Concrete pad ondowngradient end ofthe building(northwest).

Photograph #4Description:Substation yard.




ECS Project #:08-224345.00

Photograph #5Description:Substation yard andstructure.

Photograph #6Description:Upgradient portion ofthe site – lookingsouth.




ECS Project #:08-224345.00

Photograph #7Description:Transformers in thebuilding.

Photograph #8Description:Concrete samplelocation nearTransformer 1 (T1).




ECS Project #:08-224345.00

Photograph #9Description:Breakers located inthe building. Stainingobserved on theconcrete floor wastargeted for sampling.

Photograph #10Description:Sample locations onconcrete floor underbreakers. Bricksample location inwall at the back of thephoto.

green mountain power corporation

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