site investigation report - vermont · 2016-07-27 · 2.0 field methods on june 9, 2015 s&c...

Stonecipher & Clark Environmental Solutions, LLC

Site Investigation Report Former Discount Motors

2523 Portland Street St. Johnsbury, Vermont

SMS #20002772

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Site Investigation Report Former Discount Motors

2523 Portland Street St. Johnsbury, Vermont

Prepared For:

RHT&L Partners, LLC Crosstown Motors

PO Box 409 Littleton, New Hampshire 03561

Prepared By: Stonecipher & Clark Environmental Solutions, LLC

111 Saranac Street, Studio 15 Littleton, NH 03561

Project# 2015-021 Stonecipher & Clark Environmental Solutions, LLC

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Project: 2015-021

August 5, 2015

Mr. Tim Cropley Hazardous Materials Specialist Agency of Natural Resources, Waste Management Division 103 South Main Street/West Building Waterbury, VT 05671-0404 Subject: Site Investigation Report – Former Discount Motors, 2523 Portland Street, St. Johnsbury, Vermont SMS #20002772

Dear Mr. Cropley:

Stonecipher & Clark Environmental Solutions, LLC, (S&C) has completed a Site Investigation at the 2523 Portland Street Property located in St. Johnsbury, VT (the “Site”) per the requirements of the approved State of VT Agency of Natural Recsources, Department of Environmental Conservation (VTDEC) workplan dated April 29, 2015. This report summarizes our field and research methods, results, and recommendations. As part of this assessment, seven soil borings were documented and three monitoring wells installed in an effort to assess potential soils and groundwater impacts to the Site associated with one former gasoline underground storage tank (UST).

Soil boring and monitoring well locations were chosen by S&C and approved by the VTANR prior to installation. Soil samples were not collected. The Site location is shown on the Site Locus Map which is appended to this report. An aerial photo, which has also been provided, shows the approximate current configuration of the Site. Photos of the Site are included.

1.0 Site Description/History

A Site Investigation was performed by Griffin International, Inc. in March 2001. The investigation related to one UST previously located on the site as listed by the VTANR DEC. The former UST was reportedly installed around 1970 in the vicinity of the west side of the building, and subsequently removed in the 1990s. The UST was reportedly between 500 gallons and 1,000 gallons and contained gasoline. The UST was removed without VTANR DEC notification which prompted the request by VTANR DEC for subsurface investigation that occurred in 2001. Four monitoring wells were installed on-site and groundwater contamination was discovered in the vicinity of the former tank area. The Site Investigation Report prepared by Griffin International, dated March 2001,

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recommended annual sampling of the four on-site monitoring wells. No records documenting the recommended annual sampling have been found.

Two of the previously installed monitoring wells were located; MW-1 and MW-4. Monitoring wells MW-2 and MW-3 were not located.

The Site consists of one lot of record referred to as St. Johnsbury Tax ID 011-001-067-000. The Site contains approximately 5.49 acres and is operated by RHT&L Partners LLC, c/o L & T Auto Group as Autosaver Outlet. The Site was purchased by the current owner in 2005.

The Site is located on the north side of Portland Street.

The abutting property to the west is the site of a currently unoccupied commercial building which operated as the Former JJ Nissen Bakery Outlet. Property located to the north is an 82 acre lot classified as residential. Property located to the south of the site (across Portland Street) is a 167 acre parcel classified as residential.

Land in the general vicinity slopes gradually to the southwest toward Route 2 where the northern, slope portion of the site meets the paved area of the developed portion of the Site. Surface water runoff on the Site flows southerly toward the Moose River..

The subject Site, as well as neighboring properties, are connected to municipal water and sewer.

2.0 Field Methods

On June 9, 2015 S&C observed the drilling of seven soil borings and installation of three monitoring wells at the Site. All wells were located west of the Site structure and north of Portland Street. The installation of the three wells was performed by Eastern Analytical, Inc. of Concord, New Hampshire utilizing a track mounted drill rig. The monitoring well locations were selected in an effort to assess the extent of gasoline related impacts on the western end of the Site. The monitoring well locations were selected by S&C personnel and approved by the VTANR prior to installation. The locations of the monitoring wells are shown on the attached Site Plan.

Field screening was performed during installation of all monitoring wells and advancement of all soil borings. Materials largely consisted of tan or grey medium to coarse sands in the first five feet (see attached soil boring and mintoring well logs) at all soil borings, and then grey to dark grey (black at SB3) coarse sands, some silt in the following five feet. Groundwater was encountered between four and five feet below grade across the Site. Wells ranged in depth from 8.5 feet to thirteen feet below grade.

Soil samples were obtained from each split spoon sample and field screened for the presence of Volatile Organic Compounds (VOCs) with a Photo Ionization Detector (PID), Mini-Rae 2000. The results from this field screening and a description of the soils are indicated on the Soil Boring Logs which are attached to this report. PID readings ranged from 0.3 ppm to 238 ppm.

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Groundwater samples were collected on July 6, 2015. A water level meter was utilized to measure depth to groundwater in all site wells prior to sampling. The new wells were developed prior to sampling and all site wells were purged of approximately three well volumes of water and allowed to recharge prior to collection of the groundwater sample. Samples were collected from the following locations: MW-1 (existing on-site well), MW-5, MW-6, and MW-7. Samples collected were analyzed for EPA Method 8021B. Groundwater was encountered at an average of 4.2 feet below grade during monitoring well sampling.

A water sample was previously collected from MW-1 onOctober 9, 2014 and analyzed for VOCs using EPA Method 8260B. S&C was unable to sample MW-4 as the PVC had been filled to within 2” of the top of the PVC with sediment (likely due to surface water run-off).

3.0 Results 3.1 Soil

Soils observed during the advancement of soil borings and monitoring wells consisted primarily of tan or grey medium to coarse sands in the first five feet (see attached soil boring and monitoring well logs) at all soil borings, and then grey to dark grey (black at SB3) coarse sands, some silt in the following five feet. The water table was generally encountered between 4 and 5 feet below ground surface. PID readings ranged from 0.3 to 238 ppm. The following soil boring locations had PID readings at greater than 10 ppm reflecting remaining soil impacts: SB-1 (42.6 ppm @ 4-5’), SB-3 (48 ppm @ 4.5-5’, 34 ppm @ 5’-9’, 238 ppm @ 9’-10’, 47 ppm @ 10’-14’, and 12 ppm @ 14’-15’), and SB-4 (104 ppm @ 4.5’-5’, and 184 ppm @ 5-8’). Soil borings were advanced until PID concentrations revealed <5 ppm, with the exception of SB-3 with a reading 12 ppm at 14'.

Soil samples were not submitted for laboratory analysis yet based on soil boring results (PID Concentrations) it appears that an area approximately 30 feet by 30 feet to an average depth of 9 feet below grade of impacted soils remain on the Site within the vicinity and downgradient of SB-1/MW-5.

3.2 Groundwater

The following wells had exceedances of the Vermont DEC Groundwater Quality Enforcement Standards for one or more constituents analyzed: MW-5 (Benzene, 1,2,4 Trimethylbenzene, 1,3,5 Trimethylbenzene and Naphthalene), and MW-7 (Benzene and 1,2,4 Trimethylbenzene).

The laboratory analysis for the sample collected on October 9, 2014 from MW-1 detected 1,2,4-Trimethylbenzene at a concentration of 38ug/L, exceeding the VTDEC Groundwater Quality Enforcement Standard of 5ug/L.

Groundwater appears to be flowing to the south/southwest at the site.

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4.0 Conclusions

Three monitoring wells were installed at the subject Site on June 9, 2015. Locations were approved by the VTANR prior to installation.

Soils observed during the advancement of soil borings and monitoring wells consisted primarily of tan or grey medium to coarse sands in the first five feet (see attached soil boring and mintoring well logs) at all soil borings, and then grey to dark grey (black at SB3) coarse sands, some silt in the following five feet, with groundwater encountered during drilling at between four and five feet below grade. PID readings ranged from 0.3 to 238 ppm. The following soil boring locations had PID readings at greater than 10 ppm reflecting remaining soil impacts: SB-1 (42.6 ppm @ 4-5’), SB-3 (48 ppm @ 4.5-5’, 34 ppm @ 5’-9’, 238 ppm @ 9’-10’, 47 ppm @ 10’-14’, and 12 ppm @ 14’-15’), and SB-4 (104 ppm @ 4.5’-5’, and 184 ppm @ 5-8’).

Soil samples were not submitted for laboratory analysis yet based on soil boring results (PID Concentrations) it appears that an area approximately 30 feet by 30 feet to an average depth of 9 feet below grade of impacted soils remain on the Site within the vicinity and downgradient of SB-1/MW-5.

Groundwater was encountered at an average of 4.2 feet below grade during monitoring well sampling. Groundwater samples were collected on July 6, 2015. Samples were collected from the following locations: MW-1 (existing well), MW-5, MW-6, and MW-7. Samples collected were analyzed for EPA Method 8021B.

The following wells had exceedances of the Vermont DEC Groundwater Quality Enforcement Standards for one or more constituents analyzed: MW-5 (Benzene, 1,2,4 Trimethylbenzene, 1,3,5 Trimethylbenzene and Naphthalene), and MW-7 (Benzene and 1,2,4 Trimethylbenzene).

Recommendations

S&C recommends bi-annual sampling at the Site at the following wells: MW-1, MW-5, MW-6, and MW-7.

Please contact the undersigned with any questions or concerns.

Sincerely,

Jennifer Stonecipher Project Manager Stonecipher & Clark Environmental Solutions, LLC

Soil Boring Logs

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DNR FORM 542-1392

SOIL BORING LOG AND MONITORING WELL CONSTRUCTION DIAGRAM Boring / Well Number:

SB-1/MW-5

Facility Name:

Discount Motors Facility Street Address:

2523 Portland Street, St. Johnsbury, VT

Boring Depth (ft) X Diameter (in): 9 x 1 Drilling Method: Geoprobe 7822DT

Well Contractor Name:

Registration Number:

Eastern Analytical, Inc. Logged by: J. Stonecipher

Ground Surface Top of Casing 99.56' Elevation (ASL): Elevation (ASL):

Date:

Start Time:

6/9/15

N/A

Date:

End Time:

6/9/15

N/A

UST Number: LUST Number:

Depth Well Construction Details Blow Count Sample PID / FID Rock Formations, Soil, Color and Classifications, Observations

(feet)

1

2

3

Natural material

Bentonite

Sand

Screen

if applicable

N/A

N/A

N/A

No.

1

2

3

Type*

SS

SS

SS

Reading

42.6

0-4

4-5

5-8

(moisture, odor, etc.) First column for USCS

Grey, coarse sand & silt

Wet, heavy odor, grey Medium sands

9 N/A 4 SS 8-9 Grey, coarse gravelRefusal at 9'

* SS (split spoon) HS (hollow stem auger)

Observations Date: 7/6/15

Water Levels (ASL) Level: 4.3'

Static Water Level Symbol Time: N/A

Dark grey silty clay,saturated

0.0

0.0

0.0

DNR FORM 542-1392


SB-2Facility Name:







Ground Surface Top of Casing

Elevation (ASL): Elevation (ASL):

Date:

Start Time:

6/9/15

N/A

Date:

End Time:

6/9/15

N/A



(feet) if applicable

N/A

N/A

N/A

No.

1

2

3

Type*

SS

SS

SS

Reading

3.6

0-5

5-10


tan, medium to coarsesand, wet at 4'

Grey sands, saturated

N/A 4 SS


Observations Date:

Water Levels (ASL) Level:

Static Water Level Symbol Time:

0.3

N/A

DNR FORM 542-1392


SB-3

Facility Name:









Date:

Start Time:

6/9/15

N/A

Date:

End Time:

6/9/15

N/A



(feet) N/A if applicable

N/A

N/A

N/A

No.

1

2

3

Type*

SS

SS

SS

Reading

34

0-4.5

5-9'

10-14'


tan, coarse sand

black, coarse sands

N/A 4 SS 14-15' tan, fine sand


Observations Date:



coarse gravel, saturated

0

4.5-5 black, wet, fine sand...odor 48

238 9-10' dry spot, gray, concrete?

47

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DNR FORM 542-1392


SB-4Facility Name:









Date:

Start Time:

6/9/15

N/A

Date:

End Time:

6/9/15

N/A




N/A

N/A

N/A

No.

1

2

3

Type*

SS

SS

SS

Reading

184

0-4.5

5-8'


tan, coarse sand

dark gray coarse sand

N/A 4 SS


Observations Date:



4.5-5 black, silty sand & silt 104

4.8 8-10' tan fine sand

DNR FORM 542-1392

SOIL BORING LOG AND MONITORING WELL CONSTRUCTION DIAGRAM Boring / Well

Number: SB-5Facility Name:









Date:

Start Time:

6/9/15

N/A

Date:

End Time:

6/9/15

N/A




N/A

N/A

N/A

No.

1

2

3

Type*

SS

SS

SS

Reading

0-1


tan, fine sand

N/A 4 SS


Observations Date:



1-5 medium grey sand and silt, saturated at 5'

0.0

0.0

DNR FORM 542-1392


SB-6/MW-6

Facility Name:








Date:

Start Time:

6/9/15

N/A

Date:

End Time:

6/9/15

N/A



(feet)

2

3

4

Natural material

Bentonite

Sand

Screen

if applicable

N/A

N/A

N/A

No.

1

2

3

Type*

SS

SS

SS

Reading

3.5

0-2.5

5-8

10-13


tannish, coarse sand

grey, coarse sand, some silt. Wet.

13 N/A 4 SS



Water Levels (ASL) Level: 4.15'


2.5-5 grey, coarse sand, some silt. Wet.

0.3

8-10 Till0.0

Till refusal at 13'0.0

DNR FORM 542-1392

SOIL BORING LOG AND MONITORING WELL CONSTRUCTION DIAGRAM Boring / Well

Number: SB-7/MW-7

Facility Name:



Boring Depth (ft) X Diameter (in): 8.5 x 1 Drilling Method: Geoprobe 7822DT





Date:

Start Time:

6/9/15

N/A

Date:

End Time:

6/9/15

N/A



(feet)

0.5

1.5

2.5

Natural material

Bentonite

Sand

Screen

if applicable

N/A

N/A

N/A

No.

1

2

3

Type*

SS

SS

SS

Reading

3.5

0-2.5

5-8.5


tan sands

grey, coarse sands & silt. Refusal at 8.5'.

8.5 N/A 4 SS



Water Levels (ASL) Level: 4'


2.5-5 medium to coarse grey sand and silt, wet at 5'0.7

Groundwater Quality Data

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Groundwater Quality Analytical Results2014-047 Autosaver Outlet

VT DEC Groundwater Quality

Enforcement Standard

Preventive Action Level MW-1 (October 9, 2014)

Methyl-t-butyl ether(MTBE) 40 20 <5Benzene 5 0.5 31,2-Dichloroethane 5 0.5 <2Toluene 1,000 500 <11,2-Dibromoethane(EDB) 0.05 0.01 <1Ethylbenzene 700 350 <1mp-Xylene NA NA 5o-Xylene NA NA 5Tota Xylenes 10,000 5,000 101,3,5-Trimethylbenzene 4 2 <11,2,4-Trimethylbenzene 5 2.5 38Naphthalene 20 10 <5

Concentration (ug/L)

Groundwater Quality Analytical Results2015-021 Discount Motors

VT DEC Groundwater Quality Enforcement

Standard

Preventive Action Level MW-1 MW-5 MW-6 MW-7

Analytes 7/6/15 7/6/15* 7/6/15 7/6/15TOC 99.4 99.56 98.95 99.09Water Level 4 4.30 4.15 4.00Groundwater Elevation 95.4 95.26 94.8 95.09

Benzene 5 0.5 <1 40 <1 8Toluene 1,000 500 <1 20 <1 <1Ethylbenzene 700 350 <1 300 <1 35mp-Xylene NA NA <1 590 <1 5o-Xylene NA NA <1 220 <1 19Tota Xylenes 10,000 5,000 <2 810 <2 24Total BTEX NA NA <5 1,170 <5 67Methyl-t-butyl ether (MTBE) 40 20 <5 <10 <5 <51,3,5 Trimethylbenzene 4 2 <1 690 <1 <11,2,4 Trimethylbenzene 5 2.5 <1 1,800 <1 2501,2-Dichloroethane 5 0.5 <2 <10 <2 <21,2-Dibromoethane (EDB) 0.05 0.01 <1 <10 <1 <1Naphthalene 20 10 <5 220 <5 <5

Notes:NA - no standard available

* dilution factor of 10

Concentration (µg/L)

< laboratory results below detectable limits

Concentrations in bold exceed standard

Site Aerial, Site Photos, Site Plan & Laboratory Results

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Stonecipher& Clark Environmental Solutions, LLC Tannery Marketplace

111 Saranac Street - Studio 15 Littleton, NH 03561

603.575.5154

Former Discount Motors 2523 Portland Street St. Johnsbury,

VT Project: 2014-021

Aerial Map

Site

Former Discount Motors 2523 Portland Avenue, St. Johnsbury, VT

Looking northeast toward building.

Facing easterly toward building at SB1/MW-5

SB1/MW-5 SB1/MW-5


Facing south toward SB3 Facing northeast/drilling SB3

SB3

SB3


Facing south, drilling SB4 Facing north, drilling SB7/MW-7

SB4 SB7/MW-7


Facing south, drilling SB5 Facing south, drilling SB6/MW-6

SB5 SB6/MW-6


Facing northeast toward SB6/MW-6 Soil boring location SB2

SB6/MW-6 SB2


Facing east toward building Facing northeast toward front of

building

SB4 SB5

PROJECT NOTES:

1) Underground Utilities from Dig Safe, June 2015.

2) Topography on this plan based on a field survey

using a Nikon NPL-350 Total Station in June 10, 2015

3) Soil Borings & Monitering Wells were drilled on

June 9, 2015.

4) All elevations based on an assumed elevation.

NOTE:

BASE PLAN INFORMATION DERIVED FROM PLAN

TITLED: "DISCOUNT MOTORS - FEB. 16, 2001 "

GENERATED BY: GRIFFIN INTERNATIONAL

TABLE 1 - MONITORING WELL ELEVATIONS

SCALE IN FEET: 1" = 20'

WHEN PLOTTED 11" X 17"

Groundwater Contour Plan

FORMER DISCOUNT MOTORS

2523 PORTLAND STREET

ST. JOHNSBURY, VERMONT

July 2015 GROUNDWATER SITE PLAN

BASED ON JULY 2015 DATA

SHEET 1 OF 2

Stonecipher & Clark

Environmental Solutions, LLC

PROJECT NOTES:

1) Underground Utilities from Dig Safe, June 2015.

2) Topography on this plan based on a field survey

using a Nikon NPL-350 Total Station in June 10, 2015

3) Soil Borings & Monitering Wells were drilled on

June 9, 2015.

4) All elevations based on an assumed elevation.

NOTE:

BASE PLAN INFORMATION DERIVED FROM PLAN

TITLED: "DISCOUNT MOTORS - FEB. 16, 2001 "

GENERATED BY: GRIFFIN INTERNATIONAL

TABLE 1 - MONITORING WELL ELEVATIONS

SCALE IN FEET: 1" = 20'

WHEN PLOTTED 11" X 17"

Soil Boring Locations/PID Values

FORMER DISCOUNT MOTORS

2523 PORTLAND STREET

ST. JOHNSBURY, VERMONT

July 2015 GROUNDWATER SITE PLAN

BASED ON JULY 2015 DATA

SHEET 2 OF 2

Stonecipher & Clark

Environmental Solutions, LLC

site investigation report - vermont · 2016-07-27 · 2.0 field methods on june 9, 2015 s&c...

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