Bid No. 01-26-01 Attachment B.PDF

AREA OF KNOWN GROUNDWATER CONTAMINATION

Downgradient of a nearby laundry facility in the area west of the George Street Bridge which is to be replaced, it is anticipated that the Contractor will encounter:

• Potentially contaminated soil and contaminated groundwater impacted by chlorinated volatile organic compounds (CVOCs), primarily tetrachloroethylene (PCE), trichloroethylene (TCE), and associated degradation byproducts. PCE and TCE are F-listed hazardous wastes.

NOTIFICATION REQUIREMENTS

The Contractor has the following notification requirements to the City of Keene:

• At least two weeks notification prior to the Contractor beginning excavation and/or dewatering in the area of known groundwater contamination identified herein; and

• Immediate notification if the Contractor encounters potentially contaminated soil and/or groundwater elsewhere within the Project Limits.

NOTIFICATION FLOW CHART

CONTACTS

Contacts Name Office Cell

City of Keene City of Keene’s Environmental Consultant

City of Keene’s Construction Inspector

Awarded Contractor

City of Keene Representative

City of Keene's Environmental

Consultant

City of Keene's Constuction

Inspector

NHDES Project Manager

SUMMARY OF WORK

Contact information to be provided by the City of Keene at a later date.

Soil and Groundwater Management Plan

GEORGE STREET BRIDGE

Keene, New Hampshire

NHDES Site #: 199802052 Project #: 43107

Prepared for McFarland Johnson, Inc.

File No. 5303.00

May 2025

5303.00 Page i

TABLE OF CONTENTS

1.0 INTRODUCTION

2.0 NHDES-LISTED SITES OF CONCERN

3.0 EXTENT OF SOIL AND GROUNDWATER CONTAMINATION

3.1 Area of Known Groundwater Contamination

3.2 Areas of Potential Soil and Groundwater Contamination

4.0 MANAGEMENT OF CONTAMINATED SOILS

4.1 Management Plan for Potentially Contaminated Soils

4.1.1 Screening and Segregation

4.1.2 Management of Potentially Contaminated Stockpiled Soil

4.1.3 Sampling of Potentially Contaminated Stockpiled Soil

4.2 Reuse Options

5.0 MANAGEMENT OF CONTAMINATED GROUNDWATER

5.1 Area of Known Groundwater Contamination

5.2 Management Plan for Contaminated Groundwater

6.0 DOCUMENTATION

6.1 Contaminated Soil Transportation and Disposal

6.2 Contaminated Groundwater Treatment and Discharge or Disposal

APPENDICES

Appendix A Environmental Data Summary Letter Appendix B April 2025 Sampling Summary Report Appendix C Milone & Macbroom November 2019 Data Submittal Appendix D Milone & Macbroom Groundwater Management Permit Application Appendix E Project Design Plans

1.0 INTRODUCTION

As requested, Sanborn, Head & Associates, Inc. (Sanborn Head) has prepared this Soil and Groundwater Management Plan (SGMP) to describe project-specific management procedures for contaminated soils and groundwater.

Key items that this document includes are:

• Existing state-listed sites of concern within Project Limits.

• Anticipated limits (vertical and horizontal extent) of known soil and groundwater contamination.

• Site-specific management procedures for contaminated soil and groundwater; and

• Contingency plans for management of potentially contaminated soil and groundwater, if encountered.

As there is a known area of contaminated groundwater on the west side of Beaver Brook that is anticipated to be encountered during construction of this Project, the Contractor shall propose procedures for working in this area. Based on the results of environmental sampling conducted in conjunction with this project, contaminated soil and groundwater are not expected to be encountered beneath or on the east side of Beaver Brook.

Due to the nature of the known contamination on the west side of Beaver Brook, soil from beneath the seasonal high water table and dewatered liquids from this area of the work are anticipated to be classified as hazardous waste in accordance with the United States Environmental Protection Agency’s (USEPA’s) Contained-in Policy for Soil and Debris Contaminated with Hazardous Waste. Therefore, the Contractor shall use a professional consulting firm or qualified in-house staff to develop a Hazardous Waste Management Plan which describes the means and methods for management of contaminated soil and groundwater. The Hazardous Waste Management Plan and means and methods shall include, but are not limited to:

• Reference to applicable rules and regulations and how the Contractor will comply.

• Contractor’s Health and Safety Plan.

• Handling and management of potentially contaminated soils that are excavated from below the seasonal high groundwater table within the area of known groundwater contamination.

The Hazardous Waste Management Plan shall identify staging areas, storage (i.e., stockpiles or rolloffs), storage management, dewatering procedures (including collection and management of dewatered liquids), and analytical sampling requirements. A contained-out determination may be required from the New Hampshire Department of Environmental Services (NHDES) if impacted soils will not be disposed off-site as hazardous waste.

• Handling and management of contaminated dewatering liquids, including identifying staging areas for storage (e.g., fractionation tank), treatment, discharge and/or disposal. A contained-out determination will be required from the NHDES if impacted groundwater is treated for discharge.

• Transport and disposal procedures and recommended disposal facilities at which impacted materials will be disposed, if necessary.

• Handling and management of potentially impacted soil and/or dewatering liquids encountered outside the known area of impacts.

No excavation or dewatering activities in contaminated areas may take place until the Hazardous Waste Management Plan and associated means and methods has been accepted by the City of Keene and/or their designated Environmental Consultant. Based on available data for the adjacent contaminated site, it is anticipated that the City of Keene will need to acquire a temporary Hazardous Waste ID prior to containerizing any impacted groundwater and/or soil generated as a result of the work.

2.0 NHDES-LISTED SITES OF CONCERN

A review of available NHDES files indicates that potentially contaminated soil and contaminated groundwater are present at the People’s Laundry Facility site tracked by NHDES Site #199802052. Previous water quality reports indicate that there are chlorinated volatile organic compounds (CVOCs), including tetrachloroethene (PCE), present in groundwater within the project limits on the west side of Beaver Brook. This contamination is anticipated to be encountered during construction of the George Street Bridge. Recent summary reports from the People’s Laundry site are attached for reference and show the approximate location of PCE impacted groundwater in relation to Beaver Brook. Although limited surface water sampling has been conducted, sampling has not indicated the presence of PCE or other CVOCs in Beaver Brook.

There is also the potential that other properties/parcels within the project area may have contaminated soil and/or groundwater due to site development, use, and/or practices (current and/or historic) that has not yet been identified. Therefore, it is possible that contaminated soil and/or groundwater may also be present at and in proximity to these sites or at other, yet unidentified, properties within the Project Limits.

3.0 EXTENT OF SOIL AND GROUNDWATER CONTAMINATION

In support of the proposed construction activities, Sanborn Head conducted two rounds of investigative sampling. The first investigation was completed in December 2022 and the second investigation was conducted in April 2025. Results from these sampling events are presented herein.

In December 2022, Sanborn Head collected three soil samples above the water table within the George Street Bridge project limits (two from the west side of the bridge, and one from the east side of the bridge). Based on laboratory analytical results, none of the samples contained detectable concentrations of volatile organic compounds (VOCs), including CVOCs, above NHDES soil standards. PCE was the only VOC detected above laboratory limits in the soil samples and was identified in only one sample collected from the western side of the bridge.

Sanborn Head’s Environmental Data Summary Letter is included in Appendix A.

Sanborn Head did not sample groundwater as part of its December 2022 investigation.

However, as discussed in further detail in Section 3.1, contaminated groundwater is known to be present within the project limits on the western side of the George Street Bridge. Further, it is assumed that potentially contaminated soil may also be encountered below the seasonal high-water table in this area.

In April 2025, Sanborn Head conducted additional sampling within Beaver Brook and on the eastern side of the bridge to confirm that PCE impacted groundwater has not migrated from the People’s Laundry site into or beneath the brook. Sanborn Head collected two soil samples from immediately above the water table and two groundwater samples within the Project Limits on the eastern side of the George Street Bridge. In addition, a soil sample and groundwater sample were collected from beneath Beaver Brook. Based on the analytical results, PCE and other VOCs were not detected in soil beneath the brook or on the east side of the bridge. Chloromethane was the only VOC detected in groundwater; however, the detected concentrations were below the applicable Ambient Groundwater Quality Standard (AGQS). As outlined in Sanborn Head’s April 2025 Sampling Summary Report (Appendix B), chloromethane in groundwater was determined to be unrelated to PCE contamination at the People’s Laundry site, is not a listed or characteristic hazardous waste, and does not require special handling or management requirements during construction.

The Contractor must notify the City when it anticipates working in the area of known CVOC groundwater contamination. The environmental consultant for the City, or the City’s representative must be on-site during work completed at or below the seasonal high-water table on the west side of Beaver Brook.

3.1 Area of Known Groundwater Contamination

An area of known groundwater contamination associated with the People’s Laundry (9 Griffin Street, NHDES Site No. 199802052) is present in the construction area for the George Street Bridge Replacement project on the west side of Beaver Brook. It is anticipated that the groundwater is impacted by CVOCs including PCE, trichloroethylene (TCE), and vinyl chloride, and these constituents will be encountered below the groundwater table (PCE and TCE are both F-listed hazardous wastes). The depth to the water table throughout the People’s Laundry site is anticipated to range from approximately 3 to 8 feet below ground surface (ft bgs). The approximate lateral extent of contaminated groundwater is shown in the figures included in Appendices C and D.

Based on the available analytical data, full-time construction observation by the City’s Environmental Consultant will not be required. However, the City’s Environmental Consultant must be present during excavation below the seasonal high water table and/or dewatering activities conducted on the west side of Beaver Brook. Dewatered liquids and excavated soil removed from below the seasonal high-water table (i.e., moist, or wet materials) within the area of known contamination must be handled in accordance with the Contractor’s approved means and methods for managing impacted materials. Based on available data, the seasonal high-water table within the Project Limits on the west side of Beaver Brook is assumed to be approximately 3 ft bgs.

3.2 Areas of Potential Soil and Groundwater Contamination

Unidentified contaminated soil and/or groundwater may also be present in proximity to this site or at other, as of yet unidentified areas in the Project Limits. If the Contractor encounters additional potentially contaminated (exhibiting visual or olfactory evidence of impacts) soil and/or groundwater outside of the known area of groundwater contamination (see Section 3.1), the Contractor shall STOP WORK and immediately contact the City of Keene.

Excavated soil from above the seasonal high-water table on the western side of Beaver Brook (i.e., dry materials shallower than 3 ft bgs) and excavated soil and/or dewatering liquids from the eastern side of Beaver Brook will not require handling as impacted materials. These materials can be managed as common excavation (e.g., reused within project limits, if necessary). Groundwater outside the zone of known groundwater contamination can be discharged to the ground surface or surface water, if necessary, with appropriate approvals. If visual and/or olfactory evidence of impacts is observed outside of the area of known contamination during construction, the City must be contacted immediately.

4.0 MANAGEMENT OF CONTAMINATED SOILS

Potentially contaminated soil requiring screening, segregation and management is anticipated to be encountered within the Project Limits below the seasonal high-water table on the western side of Beaver Brook. The Contractor shall contact the NHDES and the City of Keene’s Environmental Consultant at least two weeks prior to beginning excavation and/or dewatering in the area identified in Section 3.1. Additional information is provided below.

4.1 Management Plan for Potentially Contaminated Soils

The City of Keene’s Environmental Consultant will NOT be on-site full-time during the Contractor’s excavation activities but must be on-site while the Contractor is working at or below the seasonal high-water table in the known area of CVOC groundwater contamination.

Any soil excavated on the west side of Beaver Brook that is not dry and/or is located 3 ft bgs or deeper shall be considered potentially contaminated soil.

4.1.1 Screening and Segregation

When working within the known area of impacted groundwater and potentially contaminated soils, the City’s Environmental Consultant will visually observe the soils for the presence of moisture and will screen the soils for the presence of VOCs using a photoionization detector (PID) to segregate potentially contaminated soils (i.e., soils located below the seasonal high-water table, which is anticipated to be approximately 3 ft bgs). The City’s Environmental

Consultant will instruct the Contractor to segregate the potentially contaminated soils into stockpiles for temporary storage. The stockpiles of potentially contaminated soils must be kept separate from other on-site soil stockpiles.

4.1.2 Management of Potentially Contaminated Stockpiled Soil

The Contractor will secure the potentially contaminated, stockpiled soil in such a manner as to prevent the soil from coming into contact with the ground, precipitation, and/or stormwater runoff. Specifically, the Contractor will stockpile the soil on and cover the stockpiles entirely with 6-mil polyethylene sheeting and will label the area of origin and date of its excavation.

Alternatively, the Contractor may store the soil in lined and covered roll-off containers. The Contractor will store the segregated soils onsite for a period up to, but not exceeding, four (4) months prior to disposal. Stockpiled soil shall only be uncovered when additional soil is being added or removed from the stockpile. The interim storage areas shall be surrounded with erosion and sediment control measures (e.g., silt fence, hay/straw bales) and public access shall be restricted utilizing caution flagging (or other equivalent means, as approved by the Engineer). If off-site storage of potentially contaminated soil is required, the City and its Environmental Consultant shall identify a proposed location and obtain NHDES approval to relocate the materials prior to doing so.

4.1.3 Sampling of Potentially Contaminated Stockpiled Soil

The City’s Environmental Consultant will be responsible for sampling and analysis of stockpiled soils. In accordance with NHDES Env-Or 611.04 (c), if the quantity of contaminated soil stockpiled is less than 50 tons, sampling and analysis shall not be required except as required by the receiving facility.

Typical acceptance criteria require one composite soil sample be collected per 200 cubic yards of soil. The City’s Environmental Consultant will collect samples for analysis and will obtain the composite samples from the stockpiled soils by homogenizing at least eight (8) discrete samples collected from newly exposed soil a minimum of 12 inches deep within the stockpile, in accordance with NHDES Env-Or-611.04(a).

For the VOC sample, the City’s Environmental Consultant will collect individual methanol preserved soil samples and have the laboratory composite the individual samples instead of compositing the soils in the field. The Environmental Consultant will submit the other field composited soil samples for analysis of waste characterization parameters consistent with the requirements of the receiving facility selected by the Contractor (and approved by the City) for disposal of the anticipated waste stream. These analyses may include the following parameters or a subset thereof: VOCs, petroleum hydrocarbons (TPH) gasoline range organics (GRO) and/or diesel range organics (DRO), total RCRA-8 metals (arsenic, barium, cadmium, chromium, lead, mercury, selenium, and silver), semi-volatile organic compounds (SVOCs), pesticides, herbicides, polychlorinated biphenyls (PCBs), ignitability/flashpoint, corrosivity/pH, reactive sulfide, and reactive cyanide. Approximately two weeks will be required for analysis of the soil (stockpile) samples.

Based on the results of the soil analyses, the City’s Environmental Consultant will determine if the soil requires off-site disposal as hazardous waste or can be disposed off-site as a non-hazardous waste per the NHDES’ Contained-Out Policy or can be reused within Project Limits. If the detected concentrations in the soil are above the NHDES’ Risk Characterization and Management Policy (RCMP) S-2 soil standards, the Environmental Consultant will make arrangements with the City’s Contractor for transport and proper disposal off-site. If the soil detected concentrations in the soil are below the NHDES’ RCMP S-2 Soil Standards, then the City and its Environmental Consultant will work with the NHDES to determine whether the Contractor can reuse the soils on-site in accordance with the guidelines provided in Section 4.2 below, or if the soil needs to be exported from the site for disposal.

If disposal of soil as hazardous waste is determined to be necessary, the City of Keene will obtain a temporary Hazardous Waste Generator ID.

4.2 Reuse Options

The City of Keene’s Environmental Consultant will review the analytical data and evaluate whether the soil can be reused on-site or whether the soil requires off-site disposal or recycling at a licensed facility.

5.0 MANAGEMENT OF CONTAMINATED GROUNDWATER

The Contractor shall contact the NHDES and the City of Keene’s Environmental Consultant at least two weeks prior to beginning excavation and/or dewatering in the area identified in Section 3.1. Based on available data, the seasonal high-water table within the area of known groundwater CVOC contamination is assumed to be approximately 3 ft bgs. It is expected that contaminated groundwater requiring dewatering will be encountered within the Project Limits on the western side of Beaver Brook. Additional information is provided below.

5.1 Area of Known Groundwater Contamination

An area of known groundwater contamination associated with the People’s Laundry (9 Griffin Street NHDES No. 199802052) is present and is further described in Section 3.1. Project Design Plans indicating the Project Limits are provided in Appendix E.

5.2 Management Plan for Contaminated Groundwater

The City of Keene’s Environmental Consultant will NOT be on-site full-time during the Contractor’s excavation activities but must be on-site while the Contractor is working at or below the seasonal high-water table in the known area of CVOC groundwater contamination.

Any groundwater encountered within the CVOC plume on the western side of Beaver Brook (refer to figures in Appendices C and D) shall be considered contaminated. Dewatered groundwater to the west of Beaver Brook is to be treated as contaminated. Handling of dewatered liquids from this portion of the site shall require appropriate material management methods such as fractionation tanks, treatment, and disposal/discharge, as appropriate.

Treatment and disposal methods for managing contaminated water shall be specified in the Contractor’s Hazardous Waste Management Plan.

If the Contractor encounters contaminated groundwater that requires dewatering, the Contractor shall dewater the contaminated groundwater and store the dewatering liquid in a fractionation tank (frac tank). The Contractor is responsible to secure the appropriate permits for treatment of (contained-out determination) and discharge (sewer) or disposal of the groundwater.

If disposal of dewatered liquids as hazardous waste is determined to be necessary, the City of Keene will obtain a temporary Hazardous Waste Generator ID.

6.0 DOCUMENTATION

Documentation of handling, management, sampling and analysis, transportation and off-site disposal performed by the Contractor shall be provided by the Contractor to the City of Keene Engineer as described below. This documentation does not include sampling and analysis, which may be performed by the City of Keene’s Environmental Consultant.

6.1 Contaminated Soil Transportation and Disposal

Off-site transport and disposal of contaminated soil will be provided by the Contractor on this Project. The City of Keene’s Environmental Consultant will only be responsible for field screening and analytical sampling of soil to assist with the evaluation of the reuse or disposal options and requirements. Any documentation related to these efforts will need to be maintained by the Contractor and provided to the City. More specifically, documentation related to off-site transport and disposal of contaminated soil, including but not limited to, bills-of-lading/manifests, weigh tickets, analytical reports, and waste profiles, shall be provided by the Contractor to the City within five (5) business days of receipt.

6.2 Contaminated Groundwater Treatment and Discharge or Disposal Sampling, treatment, and discharge and/or disposal of contaminated groundwater will be provided by the Contractor on this Project. Any documentation related to on-site treatment of dewatering liquids, and discharge and/or off-site disposal provided by the Contractor on this Project, if it should occur, will need to be maintained and provided to the City.

More specifically, documentation related to on-site treatment system sampling and discharge, or transportation and off-site disposal of contaminated groundwater, including but not limited to, permits, bills-of-lading/manifests, confirmatory sampling analytical reports, discharge rates, and waste profiles, shall be provided by the Contractor to the City within five (5) business days of receipt.

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Appendix A

Environmental Data Summary Letter

20 Foundry Street Concord, NH 03301

Re: Environmental Data Summary - Sample Collection and Analysis George Street Bridge (State Bridge No. 142/092) Replacement Keene, New Hampshire

Dear Sam:

In support of proposed roadway construction activities, Sanborn Head personnel collected soil samples from three soil borings at the George Street Bridge in Keene, New Hampshire. The soil borings were completed by S.W. Cole Engineering, Inc. (S.W. Cole) on December 5th and 6th, 2022. Representative soil samples were collected from three depths in accordance with the approved scope of work. Samples were collected in accordance with the New Hampshire Department of Environmental Protection (NHDES) Soil Standards and the NHDES Contaminated Sites Risks Characterization and Management Policy (RCMP) before being analyzed by Eastern Analytical, Inc. of Concord, NH for volatile organic compounds (VOCs) in accordance with United States Environmental Protection Agency (USEP) test method 8260C. Enclosed is a Boring Location Site Plan, boring logs, a laboratory analysis summary table, and the Eastern Analytical Laboratory Report for the December 2022 sampling event.

Soil from the borings were field screened for visual and olfactory evidence of impacts and for total VOCs via use of a PID. Obvious staining and odors were not observed and PID readings were non-detect in all three borings. Based on the laboratory analytical results, tetrachloroethene (PCE) was the only VOC detected above laboratory reporting limits and was identified in only one soil sample. PCE was detected in borehole B-1 at the shallow soil sample interval between three and five feet below grade at a concentration 0.16 milligrams per kilogram (mg/kg) which is below the NHDES Soil Standard for PCE of 2.0 mg/kg. The laboratory analysis yielded no exceedances of the NHDES Soil Standards. However, due to the presence of detectable concentrations of PCE in soil and the suspected presence of PCE impacted groundwater (from the adjacent remediation site) within the limits of work, a Soil and Groundwater Management Plan should be prepared for the proper handling and management of these materials if they are encountered during the work.

Very truly yours, SANBORN, HEAD & ASSOCIATES, INC.

William T. Emmert Senior Project Engineer

Julie S. Scott Senior Vice President

Mr. Sam White McFarland Johnson, Inc.

53 Regional Drive Concord, NH 03301

March 15, 2023 File No. 5303.00

March 15, 2023 Environmental Data Summary

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Encl. Site Plan

Boring Logs Laboratory Analysis Summary Table Eastern Analytical Laboratory Report

P:\5300s\5303.00\Source Files\Environmental Data Summary Letter\Environmental Data Summary 20230315.docx

Site Plan

B-1

ENV-1

B-2

PROJECT NUMBER:

NOTES:

1. THE BASE MAP WAS TAKEN FROM GOOGLE EARTH. IMAGERY DATE: (2014)

LEGEND:

COMPLETED SAMPLE COLLECTION BORING

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DATE:

PROJECT NUMBER:

SHEET NUMBER:

GEORGE STREET BRIDGE

PRELIMINARY SOIL SAMPLING

BORING LOCATION

SITE PLANJANUARY 2023

D. DOMBROWSKY

Z. SAGENDORF

W. EMMERT

W. EMMERT

J. SCOTT

5303.00

KEENE, NEW HAMPSHIRE

B-1

GEORGE STREET

GRAPHICAL SCALE

40'20'0'10'20'

Boring Logs

PID: ND

PID: ND

PID: ND

PID: ND

PID: ND

S-1

S-2

S-3

1 - 3

3 - 5

5 - 7

7 - 9

10 - 12

-----1'-----

-----7'-----

-----12'-----

24/18

24/15

24/8

24/3

24/2

-----0'-----

ASPHALT

FILL

ASPHALT.

Dense, brownish gray, SAND, some Gravel, few Asphalt fragments. FILL.

S-1 (3 to 5'): Loose, brown Silty SAND, little Asphalt, trace Cobbles. Moist.

S-2 (5 to 7'): Medium dense, brown, SAND, some Cobbles. Moist. FILL.

S-3 (7 to 9'): Medium dense, brown Sandy GRAVEL, trace Cobbles. Wet.

Loose, medium to coarse SAND.

Boring observation completed at 12 feet bgs.

Drilling Method: Mobile Drill B-48

Sampling Method: Continuous

Date Started: 12/06/22

Logged By: Z. Sagendorf

Sanborn, Head & Associates, Inc.

Project: George Street Bridge Redesign

Location: Keene, NH

Project No.: 5303.00

Depth (ft)

Depth of Hole

Depth of CasingRef. Pt.

9'12/06/22

Stab.

Time

Drilling Company: S. W. Cole

Foreman: M. Bussey

Date Finished: 12/06/22

Checked By:

Groundwater Readings

Date 10:14 Time

Sheet: 1 of 1

Depth to Water

Log of Boring B-1 Ground Elevation: 490 ± feet Datum:

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Field Testing

Data

Sample No.

Depth (ft)

Pen/ Rec (in)

Log

StratumSample Information

Description Spoon Blows per 6 in

Geologic Description Remarks

PID: ND

PID: ND

PID: ND

S-1

S-2

S-3

S-4

0 - 2

2 - 4

5 - 7

7 - 9

10 - 12

12 - 14

15 - 17

-----2'-----

-----17'-----

24/8

24/2

24/13

24/13

24/13

24/14

24/1

-----0'-----

TOPSOIL

Medium dense, brown TOPSOIL, some Organics, trace Cobbles, trace Sand. TOPSOIL.

Medium dense, brown, trace Clay, trace Cobbles, trace Organics.

S-1 (5 to 7'): Medium dense, brownish light gray, SAND, some Organics, trace Cobbles.

S-2 (7 to 9'): Medium dense, brown, SAND, trace Cobbles. Moist to wet.

S-3 (10 to 12'): Dense, brown, SAND, trace Cobbles. Moist to wet.

S-4 (12 to 14'): Dense, SAND, trace Cobbles.

Moist.

COBBLES.

Boring observation completed at 17 feet bgs.

Drilling Method: Mobile Drill B-48

Sampling Method: Continuous

Date Started: 12/05/22

Logged By: Z. Sagendorf

Sanborn, Head & Associates, Inc.

Project: George Street Bridge Redesign

Location: Keene, NH

Project No.: 5303.00

Depth (ft)

Depth of Hole

Depth of CasingRef. Pt.

8'12/05/22

Stab.

Time

Drilling Company: S. W. Cole

Foreman: M. Bussey

Date Finished: 12/05/22

Checked By:

Groundwater Readings

Date 12:30 Time

Sheet: 1 of 1

Depth to Water

Log of Boring B-2 Ground Elevation: 494 ± feet Datum:

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Field Testing

Data

Sample No.

Depth (ft)

Pen/ Rec (in)

Log

StratumSample Information

Description Spoon Blows

PID: ND

PID: ND

PID: ND

PID: ND

S-1

S-2

S-3

0 - 2

2 - 4

5 - 7

7 - 9

10 - 12

12 - 14

-----2'-----

-----14'-----

24/8

24/6

24/12

24/6

24/24

24/19

-----0'-----

TOPSOIL

Loose, brownish black TOPSOIL with Organics.

Medium dense, brown, trace Sand.

S-1 (5 to 7'): Medium dense, brown SOIL, trace Asphalt, trace Cobbles, trace Sand. Moist.

S-2 (7 to 9'): Medium dense, brown, trace Cobbles, trace Sand, trace Silt.

S-3 (10 to 12'): Loose, brown, fine SAND, trace Silt, trace Clay. Moist.

Medium stiff, CLAY, some Sand, trace Coal Ash.

Wet.

Boring terminated at 14 feet bgs.

Drilling Method: Mobile Drill B-48

Sampling Method: Continuous

Date Started: 12/05/22

Logged By: Z. Sagendorf

Sanborn, Head & Associates, Inc.

Project: George Street Bridge Redesign

Location: Keene, NH

Project No.: 5303.00

Depth (ft)

Depth of Hole

Depth of CasingRef. Pt.

12'12/05/22

Stab.

Time

14'Drilling Company: S. W. Cole

Foreman: M. Bussey

Date Finished: 12/05/22

Checked By:

Groundwater Readings

Date 11:00 Time

Sheet: 1 of 1

N/A

Depth to Water

Log of Boring ENV-1 Ground Elevation: 498 ± feet Datum:

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Field Testing

Data

Sample No.

Depth (ft)

Pen/ Rec (in)

Log

StratumSample Information

Description Spoon Blows

Laboratory Analysis Summary Table

Table 1

Summary of Soil Analytical Data

George Street Bridge Replacement

Keene, New Hampshire

SAMPLE LOCATION B-1 B-1 B-1 B-2 B-2 B-2 B-2 ENV-1 ENV-1 ENV-1

SAMPLE DATE 12/6/2022 12/6/2022 12/6/2022 12/5/2022 12/5/2022 12/5/2022 12/5/2022 12/5/2022 12/5/2022 12/5/2022

START DEPTH (ft.) 3 5 7 5 7 10 12 5 7 10

END DEPTH (ft.) 5 7 9 7 9 12 14 7 9 12

LABORATORY SAMPLE ID 253200.08 253200.09 253200.1 253200.04 253200.05 253200.06 253200.07 253200.01 253200.02 253200.03

Volatile Organic Compounds

AVOCs

Benzene 0.3 0.3 0.3 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Butylbenzene (n-) 110 110 110 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Butylbenzene (sec-) 130 130 130 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Butylbenzene (tert-) 100 100 100 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Ethylbenzene 120 140 140 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Isopropylbenzene (Cumene) 330 330 330 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Isopropyltoluene (4-) NS NS NS mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Naphthalene 28 28 28 mg/kg <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

Propylbenzene (n-) 85 85 85 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Styrene 17 17 17 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Toluene 100 100 100 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Trimethylbenzene (1,2,4-) 130 130 130 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Trimethylbenzene (1,3,5-) 96 96 96 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Xylene (m,p-) 500 1,000 1,500 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Xylene (o-) 500 1,000 1,500 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

CVOCs

Carbon tetrachloride 12 12 12 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Chlorobenzene (Monochlorobenzene) 6 6 6 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Chloroethane mg/kg <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

Chloroform (Trichloromethane) 3 3 3 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Chloromethane 3 3 3 mg/kg <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

Chlorotoluene (2-) 15 15 15 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Chlorotoluene (4-) 680 5,900 5,900 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Dichlorobenzene (1,2-) 88 88 88 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Dichlorobenzene (1,3-) 150 150 150 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Dichlorobenzene (1,4-) 7 7 7 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Dichloroethane (1,1-) 3 3 3 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Dichloroethane (1,2-) 0.1 0.1 0.1 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Dichloroethene (1,1-) 14 14 14 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Dichloroethene (cis-1,2-) 2 2 2 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Dichloroethene (trans-1,2-) 9 9 9 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Dichloropropane (1,2-) 0.1 0.1 0.1 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Dichloropropane (1,3-) NS NS NS mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Dichloropropane (2,2-) NS NS NS mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Dichloropropene (1,1-) NS NS NS mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Dichloropropene (cis-1,3-) NS NS NS mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Dichloropropene (trans-1,3-) NS NS NS mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Hexachlorobutadiene 17 53 120 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Methylene Chloride (Dichloromethane) 0.1 0.1 0.1 mg/kg <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

Tetrachloroethane (1,1,1,2-) 0.8 0.8 0.8 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Tetrachloroethane (1,1,2,2-) 4 4 4 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Tetrachloroethene (PCE) 2 2 2 mg/kg 0.16 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Trichlorobenzene (1,2,3-) NS NS NS mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Trichlorobenzene (1,2,4-) 19 19 19 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Trichlorobenzene (1,3,5-) NS NS NS mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Trichloroethane (1,1,1-) 78 78 78 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Trichloroethane (1,1,2-) 0.1 0.1 0.1 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Trichloroethene (TCE) 0.8 0.8 0.8 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Units

NHDES Soil Standards

S-1 S-3S-2

P:\5300s\5303.00\Work\Tables\20221216 Summary of Soil Analytical Data.xlsx Page 1 of 2 Sanborn, Head & Associates, Inc.

George Street Bridge Replacement

Keene, New Hampshire

SAMPLE LOCATION B-1 B-1 B-1 B-2 B-2 B-2 B-2 ENV-1 ENV-1 ENV-1

SAMPLE DATE 12/6/2022 12/6/2022 12/6/2022 12/5/2022 12/5/2022 12/5/2022 12/5/2022 12/5/2022 12/5/2022 12/5/2022

START DEPTH (ft.) 3 5 7 5 7 10 12 5 7 10

END DEPTH (ft.) 5 7 9 7 9 12 14 7 9 12

LABORATORY SAMPLE ID 253200.08 253200.09 253200.1 253200.04 253200.05 253200.06 253200.07 253200.01 253200.02 253200.03

Units

NHDES Soil Standards

S-1 S-3S-2

Trichloropropane (1,2,3-) 0.1 0.1 0.6 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Vinyl chloride 1 7 9 mg/kg <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02

Other VOCs

Acetone 75 75 75 mg/kg <2 <2 <2 <2 <2 <2 <2 <2 <2 <2

Bromobenzene NS NS NS mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Bromochloromethane NS NS NS mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Bromodichloromethane 0.1 0.1 0.1 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Bromoform 0.1 0.1 0.1 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Bromomethane 0.3 0.3 0.3 mg/kg <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

Butanone (2-) (MEK) 51 51 51 mg/kg <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5

Carbon disulfide 460 460 460 mg/kg <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

Dibromo-3-chloropropane (1,2-) (DBCP) 0.1 0.1 0.1 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Dibromochloromethane 1 1 1 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Dibromoethane (1,2-) (Ethylene Dibromide) 0.1 0.1 0.1 mg/kg <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02 <0.02

Dibromomethane NS NS NS mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Dichlorodifluoromethane (CFC12) 1,000 2,500 5,000 mg/kg <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

Diethyl Ether (Ethyl Ether) 3,900 3,900 3,900 mg/kg <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05 <0.05

Diisopropyl Ether (DIPE) 10 10 10 mg/kg <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

Dioxane (1,4-) 5 5 5 mg/kg <1 <1 <1 <1 <1 <1 <1 <1 <1 <1

Ethyl tert butyl ether (ETBE) 0.7 0.7 0.7 mg/kg <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

Hexanone (2-) NS NS NS mg/kg <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

Methyl-2-pentanone (4-) (MIBK) 29 29 29 mg/kg <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5

Methyl-tert Butyl Ether (MTBE) 0.2 0.2 0.2 mg/kg <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

Tert Amyl Methyl Ether (TAME) 3 3 3 mg/kg <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

Tert Butyl Alcohol (TBA) (tert-Butanol) 2 2 2 mg/kg <2 <2 <2 <2 <2 <2 <2 <2 <2 <2

Tetrahydrofuran NS NS NS mg/kg <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5

Trichlorofluoromethane (CFC11) 1,000 2,500 5,000 mg/kg <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1 <0.1

Notes:

1. Soil samples were collected by Sanborn, Head, and Associates on the date indicated. Samples were analyzed by Alpha Analytical, Inc. of Mansfield and Westborough, Massachusetts.

2. "NHDES Soil Standards" "S-1", "S-2", and "S-3" refer to the Method 1 S-1, S-2, and S-3 Soil Standards established under the New Hampshire Department of Environmental Services (NHDES) "Contaminated Sites Risk Characterization and Management Policy" (RCMP) (January 1998, with 2000 through 2018 revisions/addenda). The S-1 Soil Standards are typically equivalent to the Soil Remediation Standards (SRSs) promulgated in Env-Or 600 (June 2015). For analytes where the S-1 and SRS differ, the values presented reflect the S-1 standards in the latest RCMP update.

3. "<" indicates the analyte was not detected above the indicated laboratory reporting limit.

"NS" indicates no value is listed in the source document for this analyte.

P:\5300s\5303.00\Work\Tables\20221216 Summary of Soil Analytical Data.xlsx Page 2 of 2 Sanborn, Head & Associates, Inc.

Eastern Analytical Laboratory Report

9 Eastern Analytical, Inc.

professional laboratory and drilling services

Eric Steinhauser Sanborn, Head & Associates, Inc. (NH) 20 Foundry Street Concord , NH 03301

Laboratory Report for:

Eastern Analytical, Inc. ID: 253200 Client Identification: George Street Bridge Replacement I 5303.00

Date Received: 12/6/2022

Enclosed are the analytical results per the Chain of Custody for sample(s) in the referenced project. All analyses were performed in accordance with our QA/QC Program, NELAP and other applicable state requirements. All quality control criteria was within acceptance criteria unless noted on the report pages. Results are for the exclusive use of the client named on this report and will not be released to a third party without consent.

The following information is contained within this report: Sample Conditions summary, Analytical Results/Data, Quality Control data (if requested) and copies of the Chain of Custody. This report may not be reproduced except in fu II, without the written approval of the laboratory.

The following standard abbreviations and conventions apply to all EAi reports:

< : "less than" followed by the reporting limit > : "greater than" followed by the reporting limit

%R : % Recovery

Certifications:

Eastern Analytical, Inc. maintains certification in the following states: Connecticut (PH-0492), Maine (NH005), Massachusetts (M-NH005), New Hampshire/NELAP (1012), Rhode Island (269), Vermont (VT1012), New York ( 12072), West Virginia (991 OC) and Alabama (41620). Please refer to our website at www.easternanalytical.com for a copy of our certificates and accredited parameters.

References:

- EPA 600/4-79-020, 1983

- Standard Methods for Examination of Water and Wastewater, 20th, 21st, 22nd & 23rd edition or noted revision year.

- Test Methods for Evaluating Solid Waste SW 846 3rd Edition including updates IVA and IVB

- Hach Water Analysis Handbook, 4th edition, 1992

- ASTM International

If you have any questions regarding the results contained within, please feel free to contact customer service.

Unless otherwise requested, we will dispose of the sample(s) 6 weeks from the sample receipt date.

We appreciate this opportunity to be of service and look forward to your continued patronage.

Sincerely, Lorraine Olashaw, Lab Director

(z.,s.:z.2- Date

51 Antrim Avenue • Concord, NH 03301 • 800-287-0525 • www.easternanalytical.com Page 1 of 11

SAMPLE CONDITIONS PAGE

EAi ID#: 253200 Client: Sanborn, Head & Associates, Inc. (NH) Client Designation: George Street Bridge Replacement I 5303.00

Temperature upon receipt (°C): 2.1 Received on ice or cold packs (Yes/No): y Acceptable temperature range (°C): 0-6

Date Date/Time Sample % Dry Exceptions/Comments Lab ID Sample ID Received Sampled Matrix Weight (other than thermal preservation)

253200,01 ENV-1 S-1 12/6/22 12/5/22 09:47 soil 89,3 Adheres to Sample Acceptance Policy

253200.02 ENV-1 S-2 12/6/22 12/5/22 10:12 soil 89.2 Adheres to Sample Acceptance Policy

253200.03 ENV-1 S-3 12/6/22 12/5/22 10:44 soil 82.9 Adheres to Sample Acceptance Policy

253200.04 B-2 S-1 12/6/22 12/5/22 11:33 soil 93.2 Adheres to Sample Acceptance Policy

253200.05 B-2 $-2 12/6/22 12/5/22 11 :57 soil 89.3 Adheres to Sample Acceptance Policy

253200.06 B-2 $-3 12/6/22 12/5/22 12:18 soil 87.8 Adheres to Sample Acceptance Policy

253200.07 B-2 S-4 12/6/22 12/5/22 12:30 soil 89.3 Adheres to Sample Acceptance Policy

253200.08 B-1 S-1 12/6/22 12/6/22 10:05 soil 82.6 Adheres to Sample Acceptance Policy

253200.09 B-1S-2 12/6/22 12/6/22 10:15 soil 94.4 Adheres to Sample Acceptance Polley

253200.1 B-1S-3 12/6/22 12/6/22 10:21 soil 86,3 Adheres to Sample Acceptance Policy

253200.11 Trip Blank 12/6/22 12/5/22 00.00 soil 100.0 Adheres to Sample Acceptance Policy

All results contained in this report relate only to the above listed samples.

Unless otherwise noted:

- Hold times, preservation, container types, and sample conditions adhered to EPA Protocol.

- Solid samples are reported on a dry weight basis, unless otherwise noted. pH/Corrosivity, Flashpoint, lgnitability, Paint Filter, Conductivity and Specific Gravity are always reported on an "as received" basis.

- Analysis of pH, Total Residual Chlorine, Dissolved Oxygen and Sulfite were performed at the laboratory outside of the recommended 15 minute hold time.

- Samples collected by Eastern Analytical, Inc. (EAi) were collected in accordance with approved EPA procedures.

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LABORATORY REPORT

Client: Sanborn, Head & Associates, Inc. (NH) Client Designation: George Street Bridge Replacement I 5303.00

Sample ID: ENV-1 S-1 ENV-1 S-2 ENV-1 S-3 B-2 S-1

Lab Sample ID: 253200.01 253200.02 253200.03 253200.04 Matrix: soil soil soil soil Date Sampled: 12/5/22 12/5/22 12/5/22 12/5/22 Date Received: 12/6/22 12/6/22 12/6/22 12/6/22 Units: mg/kg mg/kg mg/kg mg/kg Date of Analysis: 12/7/22 12/7/22 12/7/22 12/7/22 Analyst: DGM DGM DGM DGM Method: 8260C 8260C 8260C 8260C Dilution Factor: 1 1 1

Dichlorodifluoromethane < 0.1 < 0.1 < 0.1 < 0.1 Chloromethane < 0.1 < 0.1 <0.1 < 0.1 Vinyl chloride < 0.02 < 0.02 < 0.02 < 0.02 Bromomethane < 0.1 < 0.1 < 0.1 < 0.1 Chloroethane < 0.1 <0.1 <0.1 < 0.1 Trichlorofluoromethane < 0.1 < 0.1 < 0.1 < 0.1 Diethyl Ether < 0.05 < 0.05 < 0.05 < 0.05 Acetone <2 <2 <2 <2 1, 1-Dichloroethene < 0.05 < 0.05 < 0.05 < 0.05 tert-Butyl Alcohol (TBA} <2 <2 <2 <2 Methylene chloride < 0.1 < 0.1 < 0.1 < 0.1 Carbon disulfide < 0.1 < 0.1 < 0.1 < 0.1 Methyl-t-butyl ether(MTBE) < 0.1 < 0.1 < 0.1 < 0.1 Ethyl-t-butyl ether(ETBE) < 0.1 < 0.1 < 0.1 < 0.1 lsopropyl ether(DIPE) < 0.1 < 0.1 < 0.1 < 0.1 tert-amyl methyl ether(TAME) < 0.1 < 0.1 < 0.1 < 0.1 trans-1,2-Dichloroethene < 0.05 < 0.05 < 0.05 < 0.05 1, 1-Dichloroethane < 0.05 < 0.05 < 0.05 < 0.05 2,2-Dichloropropane < 0.05 < 0.05 < 0.05 < 0.05 cis-1,2-Dichloroethene < 0.05 < 0.05 < 0.05 < 0.05 2-Butanone(MEK) < 0.5 < 0.5 < 0.5 < 0.5 Bromochloromethane < 0.05 < 0.05 < 0.05 < 0.05 Tetrahydrofuran(TH F) < 0.5 < 0.5 < 0.5 < 0.5 Chloroform < 0.05 < 0.05 < 0.05 < 0.05 1, 1, 1-Trichloroethane < 0.05 < 0.05 < 0.05 < 0.05 Carbon tetrachloride < 0.05 < 0.05 < 0.05 < 0.05 1, 1-Dichloropropene < 0.05 < 0.05 < 0.05 < 0.05 Benzene < 0.05 < 0.05 < 0.05 < 0.05 1,2-Dichloroethane < 0.05 < 0.05 < 0.05 < 0.05 Trichloroethene < 0.05 < 0.05 < 0.05 < 0.05 1,2-Dichloropropane < 0.05 < 0.05 < 0.05 < 0.05 Di bromomethane < 0.05 < 0.05 < 0.05 < 0.05 Bromodichloromethane < 0.05 < 0.05 < 0.05 < 0.05 1,4-Dioxane < 1 < 1 < 1 < 1 4-Methyl-2-pentanone(MIBK) <0.5 <0.5 <0.5 <0.5 cis-1,3-Dichloropropene < 0.05 < 0.05 < 0.05 < 0.05 Toluene < 0.05 < 0.05 < 0.05 < 0.05 trans-1,3-Dichloropropene < 0.05 < 0.05 < 0.05 < 0.05 1,1,2-Trichloroethane < 0.05 < 0.05 < 0.05 < 0.05 2-Hexanone < 0.1 <0.1 <0.1 <0.1 Tetrachloroethene < 0.05 < 0.05 < 0.05 < 0.05 1,3-Dichloropropane < 0.05 < 0.05 < 0.05 < 0.05 Dibromochloromethane < 0.05 < 0.05 < 0.05 < 0.05 1,2-Dibromoethane(EDB) < 0.02 < 0.02 <0.02 < 0.02 Chlorobenzene < 0.05 < 0.05 < 0.05 < 0.05 1, 1, 1,2-Tetrachloroethane < 0.05 < 0.05 < 0.05 < 0.05

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Client: Sanborn, Head & Associates, Inc. (NH) Client Designation: George Street Bridge Replacement I 5303.00

Sample ID: ENV-1 S-1 ENV-1 S-2 ENV-1 S-3 B-2 S-1

Lab Sample ID:

Matrix:

Date Sampled:

Date Received:

Units:

Date of Analysis:

Analyst:

Method:

Dilution Factor:

Ethyl benzene mp-Xylene o-Xylene Styrene Bromoform lsoPropylbenzene Bromobenzene 1, 1,2,2-Tetrachloroethane 1,2,3-Trichloropropane n-Propylbenzene 2-Chlorotoluene 4-Chlorotoluene 1,3,5-Trimethylbenzene tert-Butylbenzene 1,2,4-Trimethylbenzene sec-Butyl benzene 1,3-Dichlorobenzene p-1 sopropyltoluene 1,4-Dichlorobenzene 1,2-Dichlorobenzene n-Butylbenzene 1,2-Dibromo-3-chloropropane 1,3,5-Trichlorobenzene 1,2,4-Trichlorobenzene Hexachlorobutadiene Naphthalene 1,2,3-Trichlorobenzene 4-Bromofluorobenzene (surr) 1,2-Dichlorobenzene-d4 (surr) Toluene-d8 (surr) 1,2-Dichloroethane-d4 (surr)

253200.01 soil

12/5/22 12/6/22 mg/kg 12/7/22

DGM

8260C

< 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 <0.1

< 0.05 99%R

100 ¾R 98%R 99%R

253200.02 soil

12/5/22 12/6/22 mg/kg 12/7/22

DGM

8260C

< 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05

< 0.1 < 0.05 98%R 99%R 98%R 99%R

253200.03 soil

12/5/22 12/6/22 mg/kg 12/7/22

DGM

8260C

< 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 <0.1

< 0.05 98%R 99%R 98%R

100 ¾R

253200.04 soil

12/5/22 12/6/22 mg/kg 12/7/22

DGM

8260C

< 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 < 0.05 <0.1

< 0.05 99%R

100 ¾R 97%R

100 ¾R

Vinyl Chloride, Diethyl Ether exhibited recovery below acceptance limits in the Quality Control sample(s). The analyte(s) were not detected in the sample(s).

Eastern Analytical, Inc. www.easteranalytical.com [ 800.287.0525 ] customerservice@easternanalytic?gef 4 of 11

Client: Sanborn, Head & Associates, Inc. (NH) Client Designation: George Street Bridge Replacement I 5303.00

Sample ID: B-2 S-2 B-2S-3 B-2 S-4 B-1S-1

Lab Sample ID: 253200.05 253200.06 253200.07 253200.08 Matrix: soil soil soil soil Date Sampled: 12/5/22 12/5/22 12/5/22 12/6/22 Date Received: 12/6/22 12/6/22 12/6/22 12/6/22 Units: mg/kg mg/kg mg/kg mg/kg Date of Analysis: 12/7/22 12/7/22 12/7/22 12/7/22 Analyst: DGM DGM DGM DGM Method: 8260C 8260C 8260C 8260C Dilution Factor: 1 1

Dichlorodifluoromethane < 0.1 < 0.1 < 0.1 < 0.1 Chloromethane < 0.1 < 0.1 < 0.1 < 0.1 Vinyl chloride < 0.02 < 0.02 < 0.02 < 0.02 Bromomethane < 0.1 < 0.1 < 0.1 < 0.1 Chloroethane < 0.1 < 0.1 < 0.1 < 0.1 Trichlorofluoromethane < 0.1 < 0.1 < 0.1 < 0.1 Diethyl Ether < 0.05 < 0.05 < 0.05 < 0.05…