ross environmental associates, inc

ROSS ENV IRONMENTAL ASSOC IATES , I NC .

Hyd r og eo l o g y , Wa t e r Qu a l i t y , G I S P l a n n i n g , R emed i a ti o n , R eg u l a t o r y

C omp l i a n c e & P e rm i t t i n g , E n v i r o nmen t a l S i t e A s s e s smen t s , P e t r o l e um

I n v e s t i g a t i o n s , Geo t h e rma l T e ch n o l o g y a n d R ad on M i t i g a t i o n

MA IN OFF I C E ° P .O . Bo x 1 533 ° S t owe , V e rmon t 0 5672 ° p h on e 8 0 2 . 2 53 . 4 280 ° f a x 8 0 2 . 2 53 . 4 258 R EG IONAL OFF I C E ° P .O . Bo x 7 86 ° Newp o r t , V e rmon t 0 5855 ° p h on e 8 0 2 . 3 34 . 9 982 ° p a g e r 8 0 2 . 2 40 . 1 151

Initial Site Investigation Report

Vermont Department of Labor

5 Green Mountain Drive

Montpelier, Vermont

SMS Site #: 2008-3878

Site Coordinates: 44o 15’ 30.05” N 72

o 35’ 24.65’’ W

7 October 2011

Prepared For:

Mr. Tom Tomasi

5 Green Mountain Drive

Montpelier, Vermont 05601-0488

Phone: (802) 828-4000

Prepared By:

Ross Environmental Associates, Inc.

P.O. Box 1533

Stowe, Vermont 05672

Phone: (802) 253-4280

Fax: (802) 253-4258

R.E.A. Project No. 28-118

R.E.A. Document #: 28118ISI

TABLE OF CONTENTS

Page

Executive Summary .................................................................................................................................. i

Site Profile .... .......................................................................................................................................... ii

1.0 Introduction ................................................................................................................................ 1

1.1 Site Location and Setting .................................................................................................... 1

1.2 Site History ......................................................................................................................... 2

1.3 Land Use and Adjacent Property Ownership ....................................................................... 2

2.0 Field Investigation Results and Procedures ........................................................................... 3

2.1 Contaminants of Concern .................................................................................................. 3

2.2 Source Area Evaluation ...................................................................................................... 3

2.3 Soil Boring and Monitoring Well Installation .................................................................... 3

2.4 Ground-Water Elevations and Flow Direction ................................................................... 5

2.5 Ground-Water Sampling and Analysis ............................................................................... 5

2.6 Investigation Procedures.......................................................................................................... 6

3.0 Sensitive Receptor Identification and Risk Assessment ......................................................... 7

3.1 Receptor Identification ....................................................................................................... 7

3.2 Risk Assessment .................................................................................................................. 7

4.0 Data Evaluation and Conceptual Model.................................................................................... 7

5.0 Recommendations ...................................................................................................................... 8

6.0 Limitations .................................................................................................................................. 8

7.0 References ................................................................................................................................... 8

List of Appendices

Appendix A Figures and Tables

Appendix B Photographs

Appendix C Soil Boring/Monitoring Well Logs

Appendix D Laboratory Reports

EXECUTIVE SUMMARY

ISI Report – VT Dept. of Labor page i

Ross Environmental Associates, Inc. 28118ISI

Ross Environmental Associates, Inc. (R.E.A.) has conducted an initial site investigation (ISI) at the

Vermont Department of Labor building, located at 5 Green Mountain Drive in Montpelier, Vermont.

Field investigation included: completion of five soil borings, the installation of four groundwater

monitoring wells, sampling and analysis of groundwater from four on-site monitoring wells, and a

receptor survey to identify potential risks to the environment and human health.

Five soil borings (SB-1, SB-2, SB-3, SB-4, and SB-5) were installed on the property to evaluate the

degree and extent of subsurface contamination that was discovered in the vicinity of a 10,000-gallon fuel-

oil underground storage tank (UST), during the tank replacement in October 2008. Soils mainly consisted

of grey clay, coarse to medium brown sand with and gravel layers. Four monitoring wells (MW-1, MW-

2, MW-3, and MW-4) were installed on the property to evaluate the degree for potential groundwater

contamination in relation to the former 10,000-gallon fuel-oil underground storage tank (UST). Available

information indicates that groundwater beneath the site has not been impacted by residual petroleum

contamination. No volatile petroleum compounds or total petroleum hydrocarbons (TPH) were detected

above laboratory method detection limits in the groundwater samples collected from the onsite

monitoring wells. Based on available information, the extent of subsurface contamination has been

adequately determined and no downgradient sensitive receptors appear to be impacted or threatened.

On the basis of the results of this investigation, R.E.A. makes the following recommendation.

1. The on-site monitoring wells should be closed in accordance with VT DEC guidelines.

2. A summary report should be completed following the closure of the monitoring wells, which

will include recommendations for Site Management Activities Completed (SMAC) status.

SITE PROFILE

ISI Report – VT Dept. of Labor page ii


Site Information

Site Name: Vermont Department of Labor

SMS Site #: 2008-3878

Site Address: 5 Green Mountain Drive, Montpelier, VT

Mailing Address: P.O. Box 488, Montpelier, VT 05601-0488

Telephone: (802) 828-4000

Contact/Owner: Mr. Tom Tomasi

Coordinates: latitude 44o 15’ 29.69” N, and longitude 72

o 35’ 25.77’’ W.

Contaminants of Concern: Petroleum compounds, characteristic of fuel oil.

Source: Former 10,000-gallon fuel oil UST.

Aquifer Characteristics

Soil Type: The soils at the site consisted of clay, coarse to medium sand and gravel.

Effective Porosity: 0.4

Hydraulic conductivity: 0.5 to 5.7 ft/day

Ground-water flow direction: northwest

Horizontal hydraulic gradient: 1.5 % (10/1/2011)

Average ground water velocity: 0.225 to 2.5 ft/day.

Ground-water depth bgs: 12.48 to 15.01 feet bgs.

Saturated thickness: 5.52 to 4.99 feet.

Depth to Bedrock: Refusal from 16.5 to 20 feet bgs.

Receptors

Drinking water: Drinking water for the site and the surrounding properties is provided by the

Montpelier Water System (WSID #5722)

Ground water: No volatile organic compounds or total petroleum hydrocarbons (TPH) were

detected above laboratory method detection limits in samples collected from the

monitoring wells. (Table 2, Appendix A).

Surface water: The nearest surface water feature is the Winooski River, which is located

approximately 500 feet north of the former UST.

Buildings: The property is occupied by the Vermont Department of Labor offices.

Underground utilities: The building utilizes the Montpelier municipal wastewater treatment system.

ISI Report – VT Dept. of Labor page 1


1.0 INTRODUCTION

On 22 August 2011, Mr. Tom Tomasi, retained the services of Ross Environmental Associates, Inc.

(R.E.A.) to complete an initial site investigation (ISI) at the property in Montpelier, Vermont in

accordance with Vermont Department of Environmental Conservation (VT DEC) guidelines. The ISI

was completed to address the presence of petroleum contamination discovered in the former location of a

10,000-gallon fuel oil underground storage tank (UST), which was removed in October 2008. This

report has been prepared by R.E.A. under the direction of Mr. Tom Tomasi, unauthorized use or

reproduction of this report is prohibited without written authorization from R.E.A., or Mr. Tomasi.

1.1 Site Location and Setting

The Vermont Department of Labor (VT DOL) building is located at 5 Green Mountain Drive in

Montpelier, Vermont (Figure 1, Appendix A). The property is occupied by a state government

office, and is located in a commercial area of the Montpelier. Drinking water for the site and

surrounding properties is provided by the Montpelier Water System (WSID #5722). Based on

review of the VT Agency of Natural Resources (ANR) Private Well GIS database, is one supply well

located within a 0.5 mile radius of the release area. Wastewater disposal for the property is provided

by the Montpelier municipal wastewater system.

The ground surface of the Site slopes northward with an average elevation of approximately 530 feet

above mean sea level (Google Earth, 2011). The Winooski River is located approximately 500 feet

north and in the apparent downgradient direction from the former UST. The geographic coordinates

of the site are: latitude 44° 15’ 29.69” N, and longitude 72° 35’ 25.77” W.

The surficial geology in the vicinity of the site is mapped as a glaciolacustrine deposits consisting of

lake bottom sediments composed predominately of silt, silty clay and clay (Stewart and MacClintock,

1970). Bedrock in the area is mapped as the Missisquoi formation, Moretown member (Omm)

consisting of quartzite and quartz plagioclase granulite in layers and is of Ordovician age (Doll,

1961). No bedrock outcrops were observed on the site or adjacent properties, however, bedrock was

encountered during soil boring activities.

An orthophotograph showing the site and surrounding properties is included as Figure 2 (Appendix

A) and photographs of the site and surrounding area taken during the initial site investigation are

included in Appendix B.



1.2 Site History

On 7 October 2008, Ross Environmental Associates, Inc. (R.E.A.) provided oversight for the closure

of one 10,000-gallon fuel oil underground storage tank (UST) located at 5 Green Mountain Road in

Montpelier, Vermont. Excavation, cutting and cleaning of the UST was completed by FPH Tank

Installation and Service (FPH) of Orleans, Vermont. The age of the tank was approximately 43 years

old and was discovered to be was found to be in fair/poor condition upon removal, with some rust

and minor pitting, with observable weeps but no observable holes. A replacement 10,000-gallon

UST was installed within the open excavation. Soils in the immediate UST excavation consisted of

medium brown sand with gravel, cobbles and boulders from ground surface to approximately ten feet

below ground surface (bgs). Native soil surrounding the immediate soils consisted of grey clay from

ground surface to ten feet bgs. Additionally, organic matter with a rotting odor (presumed to be an

old wetland) was encountered at approximately 8.0 feet bgs. Groundwater was not observed in the

excavation, which extended to approximately ten feet bgs. Soils in the tank excavation were

screened for the possible presence of volatile organic compounds (VOCs) with a RAE Systems,

MiniRae 2000 photo-ionization detector (PID). PID readings on soils from the UST excavation

ranged between 0.0 to 259 parts per million per volume (ppmv), which is above the VT DEC action

level of 10 parts per million-volume (ppmv) for fuel oil contaminated soils. The highest PID

readings came from soils collected from the eastern end of the excavation below the tank at ten feet

bgs just above the concrete tank tie-down pad. The limits of soil and groundwater contamination

could not be defined during the UST closure; therefore, the VT DEC requested additional work to

identify possible impacts to the groundwater, soil, and drinking water in the vicinity of the former

UST.

To investigate the possible impacts to sensitive receptors in the vicinity of the former UST, R.E.A.

completed an Initial Site Investigation (ISI) in accordance with VT DEC guidelines. Based on this

information, R.E.A. contacted the VT DEC project manager (Mr. Ashley Desmond) and received

permission to install monitoring wells to properly characterize site conditions.

1.3 Land Use and Adjacent Property Ownership

The subject property is located at 5 Green Mountain Drive in the town of Montpelier, Vermont. The

Green Mountain Drive roadway abuts the property to the south, Montpelier High School abuts the

property to the east and a commercial property abuts the property to the west. The Winooski River



bounds the property to the north. An attached aerial photograph shows adjacent property site

features (Figure 2, Appendix A).

2.0 Field Investigation Results and Procedures

R.E.A.’s field investigation included: the installation of five soil borings (SB-1, SB-2, SB-3, SB-4

and SB-5) with four borings completed as groundwater monitoring wells (MW-1, MW-2, MW-3, and

MW-4); field screening of subsurface soil samples for the possible presence of volatile organic

compounds (VOCs) using a portable photo-ionization detector (PID); collection and analysis of

water samples from the four on-site monitoring wells, and a receptor survey to identify potential risks

to the environment and human health. Approximate monitoring well/soil boring locations and

significant site features are shown on Figure 3 (Appendix A).

The objectives of this initial site investigation were to:

� Evaluate the degree and extent of petroleum contamination in soils and ground water;

� Qualitatively assess the risks to environmental and public health via relevant sensitive receptors

and potential contaminant migration pathways.

� Identify the need for further site characterization, appropriate monitoring, and/or remedial

actions based on the site conditions.

2.1 Contaminants of Concern

Based on available information, the contaminants of concern (COC) at the VT Dept. of Labor

building are petroleum compounds related to No. 2 fuel oil. A summary of various regulatory

standards and chemical properties for petroleum compounds typically associated with No. 2 fuel oil

is included on Table 1, Appendix A.

2.2 Source Area Evaluation

Based on the review of the UST closure report and information collected during the Initial Site

Investigation, the presence of the subsurface petroleum contamination discovered on-site is related to

the former UST, which was removed in October 2008. No other upgradient sources of petroleum

contamination were identified during the Initial Site Investigation.

2.3 Soil Boring and Monitoring Well Installation

On 6 September 2011, R.E.A. provided oversight during the installation of five soil borings (SB-1,

SB-2, SB-3, SB-4 and SB-5) four of which were completed as monitoring wells (SB-1/MW-1, SB-



2/MW-2, SB-4/MW-3, and SB-5/MW-4). MW-1 was installed approximately 30 feet southeast of

the UST pad, MW-2 was installed approximately 10 feet east of the UST pad, MW-3 was installed

approximately 5 feet to the southwest of the UST pad and MW-4 was installed approximately 170

northwest of the UST pad. Monitoring well/soil boring locations are shown on Figure 3, Appendix

A.

Subsurface soils at the site consisted primarily of clay, coarse to medium brown sand and gravel.

Groundwater was encountered at from approximately 12 to 17 feet below ground surface (bgs) at the

time of drilling. Soil boring SB-1/MW-1 and SB-2/MW-2 were advanced to 20 feet bgs, and SB-3,

SB-4/MW-3 and SB-5/MW-4 were advanced to 16.5, 19 and 18 feet bgs, respectively, where refusal

was met.

Photo-ionization detector (PID) readings on the soil samples collected from the soil borings ranged

between 0.0 to 0.1 ppmv. None of the soil samples exceed the VT DEC action level of 10 ppmv for

fuel-oil contaminated soil. PID screening results are included on the soil boring logs in Appendix C.

Each monitoring well was constructed using 1.0-inch-diameter schedule 40 polyvinyl chloride (PVC)

with flush threaded joints and 0.01-inch factory-slotted well screens. All of the monitoring wells

were completed with five-foot well screens. Solid PVC risers, extending to ground surface, were

used to complete each well. A clean sand pack was placed around the screened section of each

monitoring well extending one to two feet above the top of the screen, with a bentonite seal placed

above the sand pack. Flush-mounted road-box protective casings were installed over each

monitoring well. Each well was developed after installation by removing eight to ten standing

volumes of water using a peristaltic pump. Soil descriptions and monitoring well construction details

are included on the soil boring logs in Appendix C. Technical Drilling Services (TDS) of Sterling,

Massachusetts installed the soil borings and monitoring wells with a Geoprobe Drill under direct

supervision of R.E.A.

R.E.A.’s Scientist screened soil samples from the soil borings for the possible presence of volatile

organic compounds (VOCs) using a RAE Systems mini-RAE 2000 portable PID. The PID was

calibrated with an isobutylene standard gas to a benzene reference on the day of drilling.

After installation of the soil boring/monitoring wells, R.E.A. surveyed the locations of the

boring/wells in relation to existing site features. Each boring/well was located in azimuth to an

accuracy of ± 1.0 feet, and in elevation with an accuracy of ± 0.01 feet relative to an on-site

benchmark of 100.00 feet.



2.4 Ground Water Elevations and Flow Direction

On 13 September, ground-water flow in the unconfined surficial aquifer at the site was toward the

northwest with an estimated hydraulic gradient of approximately 1.5 percent (MW-2 to MW-4).

Water-level measurements and elevation calculations for 13 September 2011, are presented in Table

2 and the ground-water contour map prepared using this data is presented as Figure 4, Appendix A.

Static water-table elevations were computed for each monitoring well by subtracting measured depth-

to-water readings from the surveyed top-of-casing (TOC) elevations, which are relative to an

arbitrary site datum of 100.00 feet.

The effective porosity of the predominantly clayey silt encountered below the water-table is

presumably around 0.4, with hydraulic conductivities of 0.5 to 5.7 feet per day (Freeze & Cherry,

1979). Assuming Darcian flow, these estimates combine with the calculated horizontal gradient of

eight percent to yield an estimated range of ground-water flow velocities of between 0.225 to 2.5 feet

per day. Contaminant migration would be less accounting for retardation and dispersion of the

contaminants.

2.5 Ground Water Sampling and Analysis

Based on available information, groundwater in the immediate vicinity of the former UST system has

not been impacted by residual petroleum contamination. At this time, the extent of subsurface

petroleum contamination has been adequately defined and no off-site sensitive receptors have been

impacted or appear to be threatened by residual petroleum contamination.

No volatile petroleum compounds or total petroleum hydrocarbons (TPH) were detected above

laboratory method detection limits in the groundwater samples collected from the four on-site

monitoring wells. No petroleum compounds were detected in the trip-blank sample, and the

duplicate sample (MW-3) was equal to the original . The analytical results are summarized on Table

3 (Appendix A), and copies of the laboratory analytical reports are included as Appendix D.

Contaminant distribution, based on samples collected on 13 September 2011, is shown on Figure 5

in Appendix A.

Prior to sample collection, R.E.A field personnel measured the water level in each monitoring well

and purged approximately three to five standing volumes of water from each well. All of the



groundwater samples were collected using dedicated polyethylene tubing. Groundwater was pumped

directly into 40-milliliter glass vials with teflon-lined septum lids. Each sample vial was preserved

with hydrochloric acid to reduce the pH to less than 2 standard units.

Immediately after sample collection, field measurements were obtained for pH, specific conductivity,

temperature, total dissolved solids (TDS), and oxygen reduction potential (ORP). A summary of the

field measurement data is included on Table 4, in Appendix A.

On 13 September 2011, groundwater samples were collected from four on-site monitoring wells

(MW-1, MW-2, MW-3, and MW-4). Groundwater samples from the monitoring wells were analyzed

for the possible presence of volatile petroleum compounds and total petroleum hydrocarbons (TPH)

in accordance with U.S. EPA Methods 8021B, and 8015 DRO (diesel-range organics), respectively.

All samples were transported under chain-of-custody in an ice-filled cooler to AMRO Environmental

Laboratories of Merrimack, New Hampshire for laboratory analysis.

2.6 Investigation Procedures

The procedures used during the initial site investigation at the Vermont Department of Labor

building are consistent with the following guidance documents:

� “Underground Storage Tank Closure and Site Assessment Requirements.” Vermont Agency

of Natural Resources, Waste Management Division. June 2003.

� “Site Investigation Guidance.” Vermont Agency of Natural Resources, Waste Management

Division. June 2005.

� “Corrective Action Guidance.” Vermont Agency of Natural Resources, Waste Management

Division. November 1997.

� “Agency Guidelines for Petroleum Contaminated Soil and Debris.” Vermont Agency of

Natural Resources, Waste Management Division. August 1996.

� ASTM D 2488-93. “Standard Practice for Description and Identification of Soils (Visual-

Manual Procedure).” American Society for Testing and Materials.

� ASTM D 5092-90. “Standard Practice for Design and Installation of Ground Water

Monitoring Wells in Aquifers.” American Society for Testing and Materials.

� ASTM D 4750-87. “Standard Test Method for Determining Subsurface Liquid Levels in a

Borehole or Monitoring Well.” American Society for Testing and Materials.

� ASTM D 4448-85a. “Standard Guide for Sampling Ground Water Monitoring Wells.”

American Society for Testing and Materials.



3.0 SENSITIVE RECEPTOR IDENTIFICATION AND RISK ASSESSMENT

Based on available information, the onsite supply well and underlying groundwater formation have not

been impacted and are not threatened by the use of the former UST or residual petroleum contamination.

3.1 Receptor Identification

The following sensitive receptors were identified in the vicinity of the subject property.

� Soil and groundwater within the general vicinity of the former UST.

� Drinking water wells located within 1,000 feet of the former UST.

� The Winooski River, located approximately 400 feet north of the former UST.

3.2 Risk Assessment

On the basis of the information obtained during this investigation, R.E.A. has qualitatively assessed

the risks that the subsurface contamination poses to human health and the environment. The findings

are summarized as follows:

� Based on available information, groundwater beneath the site has not been impacted by

residual petroleum contamination or the past operation of the former UST system. No

petroleum contamination was detected in the groundwater samples collected from the on-site

monitoring wells on 13 September 2011.

� Based on available information, nearby drinking water wells are not threatened or likely to

be impacted by the use of the former UST located on the Vermont Department of Labor

building. No petroleum contamination was detected in the groundwater samples collected

from the on-site monitoring wells on 13 September 2011.

� Based on the findings of the Initial Site Investigation, the Winooski River is not threatened

by the residual petroleum contamination.

4.0 DATA EVALUATION AND CONCEPTUAL MODEL

Information collected during the Initial Site Investigation indicates that petroleum contamination

discovered during the October 2008 UST closure has not impacted the underlying groundwater formation

or onsite drinking water well. Based on available information, the extent of subsurface contamination

has been adequately determined, and no downgradient or off-site sensitive receptors have been impacted.

A summary of the significant findings of the ISI is outlined below:



� No volatile petroleum compounds or total petroleum hydrocarbons were detected above

laboratory method detection limits in groundwater samples collected from any of the onsite

monitoring wells.

� Subsurface soils at the site consisted of clay, coarse to medium sand and gravel.

� Photo-ionization detector (PID) readings on soil samples collected from the soil borings ranged

from 0.0 to 0.1 ppmv.

� Ground-water flow in the unconfined surficial aquifer at the site was toward the northwest.

5.0 RECOMMENDATIONS

On the basis of the results of this investigation and the conclusions stated above, R.E.A. makes the

following recommendations.

1. The on-site monitoring wells should be closed in accordance with VT DEC guidelines.

2. A summary report should be completed following the closure of the monitoring wells, which will

include recommendations for Site Management Activities Completed (SMAC) status.

6.0 LIMITATIONS

This report was completed by Ross Environmental Associates, Inc. (R.E.A.) for the sole use of Mr. Tom

Tomasi in connection with an assessment of on-site environmental conditions. Use of this report by any

other person or for any other use is not authorized except with prior written consent of R.E.A. or Mr.

Tomasi.

The work was undertaken to assess environmental conditions specifically on the subject property in

accordance with generally accepted engineering and hydrogeological practices. No other warranty,

express or implied, is made. Absolute assurance that any and all possible contamination at the site was

identified cannot be provided.

The report conclusions are based, in part, on information provided by the client, their agents, or third

parties, including state or local officials. R.E.A. assumes no responsibility for the accuracy and

completeness of the information. Where visual observations are included in the report, they represent

conditions at the time of the inspection, and may not be indicative of past or future site conditions.

7.0 REFERENCES

Doll, C.G. and others, 1961. “Geologic Map of Vermont”, Office of the State Geologist.

Freeze. R. A., and Cherry, J.A., 1976. Groundwater, Prentice-Hall, Inc., Englewood Cliffs, New Jersey,

29 p.



Fetter, C.W., 1994. Applied Hydrogeology, 3rd Ed., Prentice Hall, Englewood Cliffs, New Jersey, 98 p.

Google Earth, 2007. “544 Moscow Road, Moscow, Vermont.”

Stewart, D.P. and MacClintock, P., 1970. “Surficial Geologic Map of Vermont”, Office of the State

Geologist.

FIGURES AND TABLES

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residential Industrial

MtBE 1634-04-4 --- 40 -- 39 190 0.7404 2.89 1.20 51 g/L @ 25 oC

Benzene 71-43-2 5.0 5.0 1.2 1.1 5.6 0.8789 1.69 2.13 1,820 @ 22 oC

Toluene 108-88-3 1,000 1,000 6,800 5,000 46,000 0.8669 2.06 2.65 519.5 @ 25 oC

Ethylbenzene 100-41-4 700 700 3,100 5.7 29 0.8670 2.22 3.13 187 @ 25 oC

Total Xylenes 95-47-6 10,000 10,000 -- 600 2,600 0.8802 2.11 3.13 152 @ 20 oC

1,3,5-trimethylbenzene 526-73-8 -- -- 47 200 0.8944 2.80 3.55 75.2 mg/kg @ 25oC

1,2,4-trimethylbenzene 95-63-6 -- -- 67 280 0.8758 3.57 3.65 51.9 mg/kg @ 25 oC

Naphthalene 91-20-3 -- 20 -- 3.9 20 1.145 2.74 3.40 31.7 @ 25oC

Montgomery, J.H., 2000. "Groundwater Chemicals - Desk Refrence" Third Edition. Lewis Publishers, Boca Raton, Florida.

EPA MCL. U.S. Environmental Protection Agency - Maximum Contaminant Level. In micrograms per liter (ug/L).

Vermont Groundwater Enforcement Standards (VGESs). In micrograms per liter (ug/L).

Vermont Water Quality Criteria (WQC) for the protection of human health in Class B waters. In micrograms per liter (ug/L).

RSL - U.S. EPA Regional Screening Levels (RSL) for soil. In milligrams per kilogram (mg/Kg)

Soil sorption coefficient, log Koc

Octanol/water partition coefficient, log Kow

Montpelier, Vermont


Contaminants of Concern

TABLE 1

CASNParameterEPA MCL

(ug/L)

VGES

(ug/L)

350

water solubility (mg/L)

EPA Regional Screening Level-

soil (mg/kg)WQC

(ug/L)

density (g/cm3)

@ 20/4 oC

log Koc log Kow

R.E.A. 28118COCproperties

TABLE 2

GROUND WATER ELEVATION CALCULATIONS

Well I.D.Top of Casing

Elevation (ft)

Depth to

Water (ft)

Water Table

Elevation (ft)

MW-1 100.48 14.48 86.00

MW-2 100.88 15.01 85.87

MW-3 99.77 14.11 85.66

MW-4 95.46 12.48 82.98

All values reported in feet relative to arbitrary site datum of 100.00 feet


Montpelier, Vermont

Monitoring Date: 13 September 2011

R.E.A. 28118gwe

Parameter VGES MW-1 MW-2 MW-3 MW-4Dup

(MW-3)

%

DifferenceTrip Blank

MtBE 40 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 --- ND<1.0

Benzene 5.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 --- ND<1.0

Toluene 1,000 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 --- ND<1.0

Ethylbenzene 700 ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 --- ND<1.0

Total Xylenes 10,000 ND<2.0 ND<2.0 ND<2.0 ND<2.0 ND<2.0 --- ND<2.0

1,3,5-trimethylbenzene ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 --- ND<1.0

1,2,4-trimethylbenzene ND<1.0 ND<1.0 ND<1.0 ND<1.0 ND<1.0 --- ND<1.0

Naphthalene 20 ND<2.0 ND<2.0 ND<2.0 ND<2.0 ND<2.0 --- ND<2.0

Total VOCs -- ND ND ND ND ND --- ND

TPH (DRO) -- ND<0.054 ND<0.051 ND<0.051 ND<0.052 --- --- ---

Notes: All results reported as micrograms per liter (ug/L), unless indicated otherwise.

ND: None detected at indicated detection limit.

Shaded values indicate exceedance of Vermont Groundwater Enforcement

standard (VGES)

TPH: Total Petroleum Hydrocarbons

DRO: Diesel Range Organics


350

TABLE 3

GROUND-WATER ANALYTICAL RESULTS

Vermont Deptartment of Labor

Montpelier, Vermont

R.E.A. 28118btex

Well ID pH (su)temperature

(oC)

Specific

conductivity

(uS)

ORP (mV) DO TDS Comments

MW-1 6.08 14.28 2514 186.7 2.36 200.4 no odor, silty, poor recharge

MW-2 5.24 15.38 2539 280.8 4.30 206.0 no odor , some silt

MW-3 6.15 15.27 2340 195.7 5.07 188.0 no odor , some silt

MW-4 4.83 14.96 3478 204.1 3.75 236.1 some silt, no odor, good recharge

pH reported in standard units (s.u.).

Specific conductivity reported in microsiemens (uS) or millisiemens (mS).

Oxidation-reduction potential (ORP) reported in millivolts (mV).

Total dissolved solids (TDS) reported in parts per million (ppm) or parts per (ppt) thousand.

PID = photoionization detector, reported in parts per million per volume (ppmv)


TABLE 4

FIELD MEASUREMENT DATA

Vermont Dept. of Labor

Montpelier, Vermont

R.E.A. 28118ph

SITE PHOTOGRAPHS

AA

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PP

EE

NN

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II

XX

BB

VT Department of Labor 6 September 2011

Montpelier, Vermont R.E.A.

Photo 1.

(Overview of Site – View toward North)

Photo 3.

(View of MW-2 Location – View toward

Northwest)

Photo 5.

(View of MW-4 Near Completion – View

toward South)

Photo 2.

(View of MW-1 During Installation – View

toward West)

Photo 4.

(View of MW-3 & SB-3 During Installation–

View toward West)

Photo 6.

(View of Flush Mounted Road Box Covering

Well)

MW-4

MW-2

MW-1 Former & Current

UST Location

SB-3

MW-3

SOIL BORING

MONITORING WELL LOGS

AA

PP

PP

EE

NN

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II

XX

CC

Site Name:

Site Location:

Well Depth: 20.0' Boring Depth: 20.0' Installation Date:

6.0' Job Number:

Screen Diameter: 1" Depth: 15' REA Representative:

Screen Type/Size: Drilling Company:

Riser Diameter: 1" Depth: 5' Sampling Method:

Riser Type/Size: Reference Point (RP):

Depth (ft)Sample Depth

(ft)Recovery (%) PID (ppm) Well Profile Legend

0.0

0.1

0.1

5 0-5' 100% 0.0

0.0

10 5-10' 100% 0.0

0.0

15 10-15' 100%

0.0

0.0

20 15-20' 100% 0.0

25

AND 33-50% LITTLE 10-20% <2 VERY SOFT 8-15 STIFF 0-4 VERY LOOSE 30-50 DENSE

SOME 20-33% TRACE 0-10% 2-4 SOFT 15-30 VERY STIFF 4-10 LOOSE>50 VERY

DENSE

4-8 MEDIUM STIFF >30 HARD 10-30 MEDIUM DENSE

6-Sep-11

28-118

S. Feuer

PROPORTIONS USED NOTES:

Riser

Screen

Water Level

grey CLAY and SAND

miniRAE 2000

BLOW COUNT (COHESIVE SOILS) BLOW COUNT (GRANULAR SOILS)

Boring Terminated at 20.0' bgs.

Concrete

Native Material

ORGANICS

grey CLAY and GRAVEL

Bentonite

Filter Sand

BORING / WELL IDENTIFICATION: SB-1/MW-1

VOHSA Building

Montpelier, VT

Depth to Water (during drilling):

T.D.S.

Sample Description / Notes

0.01

0.01

GeoProbe

ROSS ENVIRONMENTAL ASSOCIATES

PHONE: (802) 253-4280 FAX: (802) 253-4258

638 Main St. Suite 1B, P.O. Box 1533

Stowe, VT 05672

Site Name:

Site Location:


6.0' Job Number:







0.0

0.0

0.0

5 0-5' 75% 0.0

0.0

0.0

0.0

0.0

10 5-10' 75% 0.0

0.0

0.0

15 10-15' 75%

0.0

0.0

20 15-20' 100% 0.0

25



DENSE



T.D.S. 0.01

GeoProbe

6-Sep-11

28-118Depth to Water (during drilling):

0.01

S. Feuer


VOHSA Building

Montpelier, VT


Riser

Screen

Water Level

coarse medium brown SAND and CLAY

coarse medium brown SAND with Clay

miniRAE 2000


Concrete

Native Material

Bentonite

Filter Sand

ORGANICS

Boring terminated at 20' bgs

grey CLAY with Gravel


PHONE: (802) 253-4280 FAX: (802) 253-4258


Stowe, VT 05672

Site Name:

Site Location:

Well Depth: N/A Boring Depth: 9.5' Installation Date:

8.0' Job Number:

Screen Diameter: 1" Depth: 9.5' REA Representative:






0.0

0.0

5 0-5' 75% 0.0

0.0

10 5-10' 75% 0.0

0.0

0.0

15 10-15' 75%

0.0

0.0

20 15-20' 25%

25



DENSE


miniRAE 2000


Concrete

Native Material

Bentonite

Filter Sand

coarse medium brown SAND and CLAY

Boring Refusal at 16.5' bgs

coarse medium brown SAND and CLAY little Gravel

0.01


Riser

Screen

Water Level

T.D.S.

BORING / WELL IDENTIFICATION: SB-3

VOHSA Building

Montpelier, VT

coarse medium brown SAND and GRAVEL

6-Sep-11

28-118

0.01

ORGANICS

GeoProbe

S. Feuer




PHONE: (802) 253-4280 FAX: (802) 253-4258


Stowe, VT 05672

Site Name:

Site Location:


6.0' Job Number:







0.0

0.0

5 0-5' 75% 0.0

0.0

0.0

10 5-10' 75% 0.0

0.0

15 10-15' 75% 0.0

0.0

20 15-20' 25% 0.0

25



DENSE



S. Feuer

0.01

GeoProbe

grey CLAY

ROCK


T.D.S.


VOHSA Building

Montpelier, VT

6-Sep-11

28-118

0.01


Riser

Screen

Water Level

coarse to medium brown SAND with Gravel

miniRAE 2000


Concrete

Native Material

Bentonite

Filter Sand

ORGANICS

Boring refusal at 19.0' bgs


PHONE: (802) 253-4280 FAX: (802) 253-4258


Stowe, VT 05672

Site Name:

Site Location:


6.0' Job Number:






(ft)Recovery (in) PID (ppm) Well Profile Legend

0.0

0.0

0.0

75% 0.0

5 0-5' 0.0

0.1

0.0

100%

0.0

10 5-10' 0.0

100% 0.1

15 10-15'

20 15-20'

25



DENSE



S. Feuer


T.D.S.


VOHSA Building

Montpelier, VT

6-Sep-11

28-118

0.01

0.01

GeoProbe


Riser

Screen

Water Level

medium to coarse brown SAND and GRAVEL

Boring refusal at 18.0' bgs

miniRAE 2000


Concrete

Native Material

Bentonite

Filter Sand

ORGANICS

medium to coarse brown SAND and CLAY


PHONE: (802) 253-4280 FAX: (802) 253-4258


Stowe, VT 05672

LABORATORY

ANALYTICAL REPORTS

AA

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II

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DD

16-Sep-11Date:AMRO Environmental Laboratories Corp.

Project: 28-118 VOSHACLIENT: Ross Environmental Associates

Lab Order: 1109027Work Order Sample Summary

Date Received: 9/14/2011

Lab Sample ID Client Sample ID Collection Date Collection Time

1109027-01A MW1 9/13/2011 11:15 AM1109027-01B MW1 9/13/2011 11:15 AM1109027-02A MW2 9/13/2011 10:55 AM1109027-02B MW2 9/13/2011 10:55 AM1109027-03A MW3 9/13/2011 10:40 AM1109027-03B MW3 9/13/2011 10:40 AM1109027-04A MW4 9/13/2011 12:00 PM1109027-04B MW4 9/13/2011 12:00 PM1109027-05A Dup 9/13/2011 12:00 AM1109027-06A Trip Blank 9/13/2011 10:00 AM

1

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DATA COMMENT PAGE

Organic Data Qualifiers

ND Indicates compound was analyzed for, but not detected at or above the reporting limit.

J Indicates an estimated value. This flag is used either when estimating a concentration for tentatively identified compounds where a 1:1 response is assumed, or when the data indicates the presence of a compound that meets the identification criteria but the result is less than the sample quantitation limit but greater than the method detection limit.

H Method prescribed holding time exceeded.

E This flag identifies compounds whose concentrations exceed the calibration range of the instrument for that specific analysis.

B This flag is used when the analyte is found in the associated blank as well as in the sample.

R RPD outside accepted recovery limits

RL Reporting limit; defined as the lowest concentration the laboratory can accurately quantitate.

S Spike Recovery outside accepted recovery limits.

# See Case Narrative

Micro Data Qualifiers

TNTC Too numerous to count

Inorganic Data Qualifiers

ND or U Indicates element was analyzed for, but not detected at or above the reporting limit.

J Indicates a value greater than or equal to the method detection limit, but less than the quantitation limit.

H Indicates analytical holding time exceedance.

B Indicates that the analyte is found in the associated blank, as well as in the sample.

MSA Indicates value determined by the Method of Standard Addition

E This flag identifies compounds whose concentrations exceed the calibration range of the instrument for that specific analysis.

R RPD outside accepted recovery limits

RL Reporting limit; defined as the lowest concentration the laboratory can accurately quantitate.

S Spike Recovery outside accepted recovery limits.

W Post-digestion spike for Furnace AA analysis is out of control limits (85-115), while sample absorbance is less than 50% of spike absorbance.

* Duplicate analysis not within control limits.

+ Indicates the correlation coefficient for the Method of Standard Addition is less than 0.995

# See Case Narrative

Report Comments:1. Soil, sediment and sludge sample results are reported on a "dry weight" basis.2. Reporting limits are adjusted for sample size used, dilutions and moisture content, if applicable.



Project: 28-118 VOSHACLIENT: Ross Environmental Associates Lab Order: 1109027

AMRO Environmental Laboratories Corp. Date: 16-Sep-11

Client Sample ID: MW1

Lab ID: 1109027-01 Collection Date: 9/13/2011 11:15:00 AM

Matrix: GROUNDWATER

Analyses Result Qual Units Date AnalyzedRL DF

Collection Time:

EPA 8260B AROMATIC VOLATILES BY GC/MS SW8260B Analyst: SK

Methyl tert-butyl ether 9/15/2011 4:04:00 PM1.0 µg/L 1NDBenzene 9/15/2011 4:04:00 PM1.0 µg/L 1NDToluene 9/15/2011 4:04:00 PM1.0 µg/L 1NDEthylbenzene 9/15/2011 4:04:00 PM1.0 µg/L 1NDm,p-Xylene 9/15/2011 4:04:00 PM2.0 µg/L 1NDo-Xylene 9/15/2011 4:04:00 PM2.0 µg/L 1ND1,3,5-Trimethylbenzene 9/15/2011 4:04:00 PM1.0 µg/L 1ND1,2,4-Trimethylbenzene 9/15/2011 4:04:00 PM1.0 µg/L 1NDNaphthalene 9/15/2011 4:04:00 PM2.0 µg/L 1ND Surr: Dibromofluoromethane 9/15/2011 4:04:00 PM82-122 %REC 1114 Surr: 1,2-Dichloroethane-d4 9/15/2011 4:04:00 PM73-135 %REC 1122 Surr: Toluene-d8 9/15/2011 4:04:00 PM82-117 %REC 197.3 Surr: 4-Bromofluorobenzene 9/15/2011 4:04:00 PM77-119 %REC 193.4



Matrix: GROUNDWATER


Collection Time:









Matrix: GROUNDWATER


Collection Time:




Lab ID: 1109027-04 Collection Date: 9/13/2011 12:00:00 PM

Matrix: GROUNDWATER


Collection Time:







Client Sample ID: Dup

Lab ID: 1109027-05 Collection Date: 9/13/2011

Matrix: GROUNDWATER


Collection Time:


Methyl tert-butyl ether 9/15/2011 6:22:00 PM1.0 µg/L 1NDBenzene 9/15/2011 6:22:00 PM1.0 µg/L 1NDToluene 9/15/2011 6:22:00 PM1.0 µg/L 1NDEthylbenzene 9/15/2011 6:22:00 PM1.0 µg/L 1NDm,p-Xylene 9/15/2011 6:22:00 PM2.0 µg/L 1NDo-Xylene 9/15/2011 6:22:00 PM2.0 µg/L 1ND1,3,5-Trimethylbenzene 9/15/2011 6:22:00 PM1.0 µg/L 1ND1,2,4-Trimethylbenzene 9/15/2011 6:22:00 PM1.0 µg/L 1NDNaphthalene 9/15/2011 6:22:00 PM2.0 µg/L 1ND Surr: Dibromofluoromethane 9/15/2011 6:22:00 PM82-122 %REC 1118 Surr: 1,2-Dichloroethane-d4 9/15/2011 6:22:00 PM73-135 %REC 1123 Surr: Toluene-d8 9/15/2011 6:22:00 PM82-117 %REC 198.6 Surr: 4-Bromofluorobenzene 9/15/2011 6:22:00 PM77-119 %REC 1100

Client Sample ID: Trip Blank


Matrix: GROUNDWATER


Collection Time:









Matrix: GROUNDWATER


Collection Time:

DIESEL RANGE ORGANICS SW8015B Analyst: KAM

Diesel Range Organics 9/15/2011 5:09:00 PM0.054 mg/L 1ND Surr: o-Terphenyl 9/15/2011 5:09:00 PM38-122 %REC 198.3



Matrix: GROUNDWATER


Collection Time:





Matrix: GROUNDWATER


Collection Time:


Diesel Range Organics 9/15/2011 6:23:00 PM0.051 mg/L 1ND Surr: o-Terphenyl 9/15/2011 6:23:00 PM38-122 %REC 1101


Lab ID: 1109027-04 Collection Date: 9/13/2011 12:00:00 PM

Matrix: GROUNDWATER


Collection Time:





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