File 2 Final Bethpage Offsite SVI Monitoring Plan.pdf

FINAL SUPPLEMENTAL

OFFSITE SOIL VAPOR INTRUSION MONITORING

PLAN FOR THE

SOIL VAPOR EXTRACTION CONTAINMENT

SYSTEM

SITE 1 – FORMER DRUM MARSHALLING AREA

NWIRP BETHPAGE

Bethpage, New York

Naval Facilities Engineering Command

Mid-Atlantic

Contract No. N62470-08-D-1001 Contract Task Order WE06

FEBRUARY 2012

i

TABLE OF CONTENTS

SECTION PAGE

ACRONYMS ............................................................................................................................................ A-1

1.0 INTRODUCTION ......................................................................................................................... 1-1

2.0 OFFSITE SVPM INSTALLATION ............................................................................................... 2-1

3.0 SVE CONTAINMENT SYSTEM OFFSITE VACUUM FIELD MONITORING ............................. 3-1

4.0 OFFSITE SOIL GAS MONITORING ........................................................................................... 4-1

5.0 REPORTING ............................................................................................................................... 5-1

REFERENCES ........................................................................................................................................ R-1

APPENDICES

A NYSDEC Letter B SVPM and SVE Construction Logs C SVE, SVPM Vacuum Measurement, and Soil Gas Sampling Log Sheets D Termination of Mitigation System Operations - Enclose from NYSDEC letter

(January 24, 2012)

TABLES

NUMBER

1 SVE and SVPM Construction Details 2 Offsite Soil Gas Monitoring Sample Nomenclature and Analytical Method

FIGURES

NUMBER

1 General Location Map 2 Site Location Map 3 SVE/SVPM Location Map ii

ACRONYMS

APU air purification unit

AS/SVE air sparging/soil vapor extraction

CLEAN Comprehensive Long-Term Environmental Action Navy

CTO contract task order

DCA 1, 1-dichloroethane

DCE 1, 1-dichloroethene

DPT direct-push technology

ELAP Environmental Laboratory Approval Program

GAC granular activated carbon in-wc inches of water column mL milliliter mL/min milliliter per minute

NFA no further action

NWIRP Naval Weapons Industrial Reserve Plant

NYSDEC New York State Department of Environmental Conservation

NYSDOH New York State Department of Health

OM&M Operation, Maintenance, and Monitoring

PCE Tetrachloroethene

SSD sub-slab depressurization

SVE soil vapor extraction

SVI soil vapor intrusion

SVPM Soil Vapor Pressure Monitor

TCA 1, 1, 1-trichloroethene

TCE trichloroethene

Tetra Tech Tetra Tech NUS, Inc.

VOC volatile organic compound

USEPA United States Environmental Protection Agency µg/m micrograms per cubic meter

1-1

1.0 INTRODUCTION

Tetra Tech NUS Inc. (Tetra Tech) under Contract Task Order (CTO) WE06 prepared this

Supplemental Offsite Soil Vapor Intrusion (SVI) Monitoring Plan for the Naval Facilities

Engineering Command Mid-Atlantic under the Comprehensive Long-Term Environmental Action

Navy (CLEAN) contract number N62470-08-D-1001. This plan presents the additional soil vapor pressure and analytical monitoring to evaluate the effectiveness of the Soil Vapor Extraction

(SVE) Containment System at Site 1 – Former Drum Marshalling Area, Naval Weapons Industrial

Reserve Plant (NWIRP) Bethpage, Long Island, New York in controlling potential SVI. This plan details the installation of additional Soil Vapor Pressure Monitoring (SVPM)/soil gas monitoring points and the vacuum field and soil gas monitoring to be conducted in the residential neighborhood east of Site 1 at NWIRP Bethpage (Figures 1 and 2). This monitoring plan supplements the Final Operation, Maintenance, and Monitoring (OM&M) plan submitted in June

2010 (Tetra Tech EC, 2010) that addresses onsite actions.

Site 1 – Former Drum Marshalling Area was impacted by the historic releases of chlorinated solvents and was initially remediated via an air sparging/soil vapor extraction (AS/SVE) system between 1998 and 2002. The treatment and remedial goals were based on protection of groundwater. Soil gas testing conducted in January 2008 indicated elevated concentrations of

Volatile Organic Compounds (VOCs) along the eastern boundary of Site 1 that could potentially affect the adjacent residential neighborhood (Tetra Tech, 2008). Additional soil gas testing was conducted in the Town of Oyster Bay right-of-ways from October 2008 through January 2009 to evaluate the potential migration of contaminated soil vapor off-site (Tetra Tech, 2009a). Based on evaluation of this soil gas data, sampling (indoor air, outdoor air, and sub-slab soil vapor) were conducted to evaluate potential vapor intrusion into residential homes.

From January through April 2009, soil vapor intrusion sampling was conducted in 18 residential homes located east and adjacent to Site 1 (Tetra Tech, 2009b). Between February and May

2011, as an interim measure, granular activated carbon (GAC)-based air purification units (APUs) and sub-slab depressurization systems (SSDs) were placed in homes to mitigate vapor intrusion concerns (Navy, 2009c).

From May through November 2009, indoor air monitoring was conducted to evaluate the mitigation measures implemented in homes and monitor air quality (Tetra Tech, 2009d and e, 2010). In December 2009, construction of the SVE Containment System along the eastern boundary of Navy property was completed. System start up activities began in late December

1-2 CTO-WE06

2009 and was finished in early January 2010. The SVE Containment System continues to operate at Site 1.

Indoor air monitoring activities continued through February 2011, with sampling events conducted in March, July, August, November 2010, and February 2011. The results are presented in the

June 2011 Data Summary Report and Home Evaluation (Tetra Tech, 2011b). By November

2010, all indoor air concentrations were below the New York State Department of Health

(NYSDOH) air guideline values (NYSDOH, 2006). Also, based on the comparison of the sub-slab soil vapor and indoor air results to the NYSDOH decision matrices, no further action (NFA) was the recommended action for all of the homes with only the SVE Containment System in operation. The VOC concentrations in soil gas (SVPMs) and the sub-slab samples collected in the homes have shown consistent decreasing trends. VOC reductions ranged from 99.98% to

99.99% for trichloroethene (TCE), tetrachloroethene (PCE), and 1, 1, 1-trichloroethane (TCA) in the sub-slab and corresponding soil gas locations.

The results of pressure measurements collected from the offsite SVPMs and from the sub-slab locations in the homes combined with the decrease observed in VOC concentrations indicate a vacuum field has been established throughout the study area. The pressure measurements collected from SVPMs along 11 th Street were consistent with the readings collected from the sub-slab sample points in the homes and demonstrated that a measurable vacuum field had been established. Vacuum measurements along 10 th Street were not as consistent, but when coupled with analytical data, confirm that the area is being effectively treated.

The June 2011 Data Summary Report and Home Evaluation provided recommendations to address and monitor offsite soil vapor intrusion, as follows:

Continue operation of the SVE Containment System

Add a shallow SVPM to each existing SVPM cluster located in the Town of Oyster Bay right-of ways to better monitor the SVE Containment System vacuum field and track soil vapor conditions under the homes. Install additional clusters of shallow, intermediate, and deep SVPMs in the northern portion of the residential block on both 10 th and 11 th

Streets and repair and/or replace SVPM-2007I on 10 th Street (Figure 3).

Conduct quarterly rounds of pressure measurements from the SVE/SVPMs to monitor the SVE Containment System vacuum field

Based on the vacuum field and onsite system monitoring, optimize the operation and flow distribution of the SVE Containment System.

1-3 CTO-WE06

Conduct annual SVPM soil gas sampling for VOCs until the source area has been remediated

If concentrations of TCE greater than 250 micrograms per cubic meter (µg/m ) or PCE and TCA greater than 1,000 µg/m are observed in the shallow or intermediate SVPM soil gas samples, re-evaluate SVE Containment System operation, attempt to determine if there is a new source for these detections, and if necessary, re-evaluate soil vapor intrusion sampling in select residential homes.

These conclusions and recommendations were outlined in the June 2011 “Data Summary Report and Home Evaluation, January to March 2011, Soil Vapor Intrusion Investigation, Site 1 – Former

Drum Marshalling Area, NWRIP Bethpage” (Tetra Tech 2011b). The report was reviewed by the

New York State Department of Environmental Conservation (NYSDEC) and the NYSDOH

(Appendix A). This Offsite Vapor Intrusion Monitoring Plan has been developed to ensure the offsite vacuum field is maintained and the SVE Containment System continues to function as the mitigation system for the impacted and potentially impacted homes in the neighborhood.

2-1 CTO-WE06

2.0 OFFSITE SVPM INSTALLATION

Based on an evaluation of the SVE Containment System conducted in February and June 2011, a vacuum field was established throughout the offsite study area (Tetra Tech, 2011b). The vacuum field was confirmed at all samples depths along 11 th Street and was more pronounced near the southeast corner of Site 1 and less pronounced near the northeast corner of Site 1.

However, the evaluation also determined that additional SVPMs are needed to more effectively monitor the offsite vacuum field. A vacuum field was also verified for the homes on 10 th Street, although the readings were close to the limit of the field instrument (0.01 inches of water column

[in-wc]).

Currently nine offsite SVPMs are present. Ten new SVPMs will be installed in the offsite residential neighborhood to enhance the SVPM vacuum field monitoring network (Figure 3).

Existing SVE and SVPM construction logs are provided in Appendix B and details are summarized on Table 1. The new SVPMs will be installed via direct push technology (DPT) to the targeted depths as described in Table 1. Each of the new locations correspond to soil boring locations advanced during the Phase II soil gas sampling conducted in October 2008 and

January 2009 (Tetra Tech, 2009a). The two new SVPM clusters (BPS1-SVPM-2001 and -2006) will be installed on 10 th and 11 th Streets in the northern portion of the residential block and consist of three SVPMs to depths of 10 feet (shallow – S), 25 feet (intermediate – I), and 45 feet (deep –

D). Three shallow SVPMs will be installed at existing SVPM clusters BPS1-SVPM-2003, -2004, and -2007. The existing SVPM, BPS1-SVPM-2007I, which appears to be damaged, will be replaced.

To facilitate the pressure readings and soil gas sampling, installation of each SVPM will consist of placement of a 6-inch long stainless steel soil gas implant to the targeted depths at each location.

High-density polyethylene tubing will extend from the implant to the ground surface for measurements and sampling. Between the existing and new SVPMs, implants will be placed at each location as presented on Table 1. The annular space just below and around each implant will be filled with No. 2 sand to a height of approximately 2 or 3 feet above the implant. Granular bentonite will be used as a seal and placed to a minimum thickness of approximately 2 or 3 feet and hydrated to provide a seal in between each soil gas implant. The remainder of the annulus above the shallow implant will be filled with bentonite/cement grout to the ground surface. The end of the poly tubing will have barbed fittings for attaching a pressure gauge and canisters, to obtain vacuum readings and to collect soil gas samples. Each SVPM will be completed with a flush mount well cover.

3-1 CTO-WE06

3.0 SVE CONTAINMENT SYSTEM OFFSITE VACUUM FIELD MONITORING

A total of eighteen offsite SVPMs will be used to monitor the SVE Containment System vacuum field and determine the effectiveness of the system in capturing and containing offsite soil vapors in the residential area east of Site 1. Table 1 presents SVPM construction details for the existing and new monitoring points. Vacuum readings for the existing SVE wells will also be monitored.

Pressure readings will be collected on a quarterly basis to confirm and monitor the SVE

Containment System vacuum field.

Vacuum/soil vapor pressure measurements will be recorded in inches of water column gauge pressure (in-wc). Field forms for recording pressure measurements, other system information, and soil gas sampling logs are provided in Appendix C.

Gauge pressure is used to evaluate the pressure gradient (pressure or vacuum). These vacuum/pressure readings in the subsurface can be temporarily effected by high and low pressure systems moving through an area. Decreasing atmospheric pressures can result in a temporary positive (or less negative) gauge reading in the subsurface. The time required for soil gas to equilibrate with the atmosphere is dependent on the depth of the sample point, the vertical conductivity of the soil, and the presence of low permeability surface features. As a result, changes in atmospheric pressure during the monitoring period must be considered during evaluation of the data.

As a part of the SVE Containment System monitoring, valve positions will be recorded for each of the SVE wells. The valves are located in the Flow Monitoring Station located in the southeast corner of Site 1 (Figure 3). The Flow Monitoring Station consists of an 8 ft wide x 8 ft tall x 20 ft long Conex box in which all of the SVE lines from the fenceline SVE wells collect into a single manifold and from this location a single underground pipeline has been routed to the Treatment

Building. The valves for the five new SVE wells south of Plant #3 are located at each individual

SVE well location as presented in Figure 3. These new SVE wells are being operated to help address residual VOCs in onsite soils utilizing excess capacity of the SVE blowers.

In addition to quarterly recording of the pressure and valve positions for the SVE wells, the flow rate will be measured at the main manifold in the Flow Control Station and in the Treatment

Building. Data will also be collected on blower operation, pre-carbon temperature, pre-blower pressure, and the presence of condensate in the system piping inside the treatment building.

4-1 CTO-WE06

4.0 OFFSITE SOIL GAS MONITORING

Eighteen soil gas samples will be collected from the SVPMs annually to monitor the continued effectiveness of the SVE Containment System in reducing VOCs in offsite soil vapor in the residential area east of Site 1. Table 1 presents the SVPM construction details for the existing and proposed monitoring points. The SVPM locations are presented on Figure 3. The specific activities for the annual rounds of soil gas sampling will be as follows:

1. Collect flow rate from SVE Containment System at operations building

2. Collect an initial round of vacuum readings from the 18 SVPMs

3. Collect soil gas samples from the 18 SVPMs

4. Collect a second round of vacuum readings from the 18 SVPMs

Sample nomenclature and analysis for the soil gas sampling are presented in Table 2. The field sampling team will maintain a Soil Gas Sample Log Sheet, as presented in Appendix C, for each sample collected. Other pertinent information regarding sample identification or sample collection will be recorded in the field logbook.

The soil gas sampling procedures for each SVPM will be as follows:

1. Connect valve assembly to the sampling port of the SVPM.

2. Connect a vacuum pump to the valve assembly. Purge one to three tubing and implant volumes of soil gas (see table below for appropriate volumes) from the SVPM using the vacuum pump at a rate that should not exceed 200 milliliter per minute (mL/min).

Pre-Sample Purging Requirements

SVPM ¼-Inch Tubing Length (feet)

Purge Goal (1 to 3 Volumes - mL)

Purge Time at 100 mL/minute (minute)

Shallow (S) 10 97 to 290 1 to 3

Intermediate (I) 25 240 to 730 2.5 to 7

Deep (D) 45 440 to 1,300 4.5 to 13

3. Record on the Soil Gas Sample Log Sheet and/or field notebook the flow controller number with the appropriate SUMMA canister number. Isolate vacuum pump and collect soil gas sample with SUMMA canister.

SUMMA

canisters will be utilized for collecting all soil gas samples. The soil gas samples will be obtained over a 30-minute time period. SUMMA canisters will be shipped to the laboratory via overnight carrier (e.g., Federal Express) for analysis.

4-2 CTO-WE06

Ambient air samples will also be collected simultaneously during the soil gas sampling to evaluate potential chemicals in the local ambient air. The SUMMA canister will be positioned at an upwind location at a height of 4 ft above grade. The ambient air sample will be obtained over an eight-hour period. If SVPM sampling takes more than one day, an additional ambient air sample may be collected. Ambient air samples will be shipped to the laboratory as described above.

The soil gas samples will be analyzed for the site specific compound list: 1,1-dichloroethane

(DCA) , 1,1-dichloroethene (DCE), TCA, 1,2-dichloroethane, cis-1,2-dichloroethene, trans-1,2-dichloroethene, TCE, PCE, vinyl chloride; and in accordance to United States Environmental

Protection Agency (USEPA) Method TO-15 VOCs by an Environmental Laboratory Approval

Program (ELAP) certified laboratory (USEPA, 1999).

During the initial soil gas sampling event, or if there is evidence that the integrity of the SVPMs have been compromised (i.e., damaged well cover or tubing), tracer gas (helium) testing will be conducted in accordance with NYSDOH Soil Vapor Guidance Section 2.7.5.

5-1 CTO-WE06

5.0 REPORTING

SVPM readings will be reported in the quarterly OM&M reports. The results of the annual soil gas monitoring, including system performance details, field documentation, sampling sheets, and other operational information collected during the operation, monitoring, and maintenance of the SVE

Containment System will be reported in the annual monitoring report.

In addition, the annual report will evaluate the need for continued operation of the SVE Containment

System in accordance with NYSDOH “Termination of mitigation systems operations” (see Appendix

D).

R-1

REFERENCES

New York State Department of Health (NYSDOH), 2006. Final Guidance for Evaluating Soil Vapor Intrusion in the State of New York. October.

Tetra Tech EC, Inc. (Tetra Tech), 2010. Final Operation and Maintenance Plan for Soil Vapor Extraction Containment System, Site 1 – Former Drum Marshalling Yard. Naval Weapons Industrial Reserve Plant, Bethpage, New York. June.

Tetra Tech NUS, Inc. (Tetra Tech), 2008. Site 1-Soil Vapor Investigation. Naval Weapons Industrial Reserve Plant, Bethpage, New York. April.

Tetra Tech NUS, Inc. (Tetra Tech), 2009a. Site 1 – Phase II Soil Vapor Report, Site 1 – Former Drum Marshalling Area. Naval Weapons Industrial Reserve Plant, Bethpage, New York. August.

Tetra Tech NUS, Inc. (Tetra Tech), 2009b. Data Summary Report Soil Vapor Intrusion Investigation, Site 1 – Former Drum Marshalling Area. Naval Weapons Industrial Reserve Plant, Bethpage, New York. August.

Tetra Tech NUS, Inc. (Tetra Tech), 2009d. Quarterly Data Summary Report Indoor Air and SSD Monitoring (May, June, and July 2009) Site 1 - Former Drum Marshalling Area, Naval Weapons Industrial Reserve Plant, Bethpage, New York. October.

Tetra Tech NUS, Inc. (Tetra Tech), 2009e. Quarterly Data Summary Report Indoor Air and SSD Monitoring (August, September, and October 2009) Site 1 - Former Drum Marshalling Area, Naval Weapons Industrial Reserve Plant, Bethpage, New York. December.

Tetra Tech NUS, Inc. (Tetra Tech), 2010. Quarterly Data Summary Report Soil Vapor Intrusion Monitoring (November and December 2009, and January 2010). Site 1 - Former Drum Marshalling Area, Naval Weapons Industrial Reserve Plant, Bethpage, New York. February.

Tetra Tech NUS, Inc. (Tetra Tech), 2011a. Modification to Existing SVE Containment System, Site 1 – Former Drum Marshalling Area. Naval Weapons Industrial Reserve Plant, Bethpage, New York. September.

Tetra Tech NUS, Inc. (Tetra Tech), 2011b. Data Summary Report and Home Evaluation (January

- March 2011) Soil Vapor Intrusion Investigation Site 1 - Former Drum Marshalling Area Naval Weapons Industrial Reserve Plant, Bethpage, New York, June.

United States Environmental Protection Agency (USEPA), 1999. Compendium of Methods for the Determination of Toxic Organic Compounds in Ambient Air Second Edition Compendium Method TO-15 Determination Of Volatile Organic Compounds (VOCs) In Air Collected In Specially- Prepared Canisters And Analyzed By Gas Chromatography/ Mass Spectrometry (GC/MS).

January.

United States Environmental Protection Agency (USEPA), 2008. EPA Regional Screening Levels for Residential Air, Oak Ridge National Laboratory (ORNL), updated September 2008, retrieved from the EPA website, http://www.epa.gov/reg3hwmd/risk/human/rb-concentration_table/index.htm

U.S. Navy. (Navy), 2009c. Time Critical Removal Action – Off Site Soil Vapor Intrusion Site 1- Former Drum Marshalling Area Naval Weapons Industrial Reserve Plant Bethpage, New York, June.

http://www.epa.gov/reg3hwmd/risk/human/rb-concentration_table/index.htm http://www.epa.gov/reg3hwmd/risk/human/rb-concentration_table/index.htm

TABLES

TABLE 1

SVE AND SVPM CONSTRUCTION DETAILS

SITE 1 - FORMER DRUM MARSHALLING AREA

NWIRP BETHPAGE, NEW YORK

LOCATION LOCATION ID TYPE STATUS DEPTH

11th Street

BPS1-SVPM2001S SVPM New 8-10

BPS1-SVPM2001I SVPM New 23-25

BPS1-SVPM2001D SVPM New 43-45

11th Street

BPS1-SVPM2002S SVPM Existing 8-10

BPS1-SVPM2002I SVPM Existing 23-25

BPS1-SVPM2002D SVPM Existing 42-44

11th Street

BPS1-SVPM2003S SVPM New 8-10

BPS1-SVPM2003I SVPM Existing 23-25

BPS1-SVPM2003D SVPM Existing 43-45

Sycamore Avenue

BPS1-SVPM2004S SVPM New 8-10

BPS1-SVPM2004I SVPM Existing 23.5-25.5

BPS1-SVPM2004D SVPM Existing 40-42

10th Street

BPS1-SVPM2006S SVPM New 8-10

BPS1-SVPM2006I SVPM New 23-25

BPS1-SVPM2006D SVPM New 43-45

10th Street

BPS1-SVPM2007S SVPM New 8-10

BPS1-SVPM2007IR SVPM Replacement 23-25

BPS1-SVPM2007D SVPM Existing 40-42

Onsite Fenceline SVE 101I SVE Well Existing 25-35

Onsite Fenceline SVE 101D SVE Well Existingg 40-60

Onsite Fenceline SVE 102I SVE Well Existing 25-35

Onsite Fenceline SVE 102D SVE Well Existing 40-60

Onsite Fenceline SVE 103I SVE Well Existing 25-35

Onsite Fenceline SVE 103D SVE Well Existing 40-60

Onsite Fenceline SVE 104I SVE Well Existing 25-35

Onsite Fenceline SVE 104D SVE Well Existing 40-60

Onsite Fenceline SVE 105I SVE Well Existing 25-35

Onsite Fenceline SVE 105D SVE Well Existing 40-60

Onsite Fenceline SVE 106I SVE Well Existing 25-35

Onsite Fenceline SVE 106D SVE Well Existing 40-60

Onsite SVE 107 SVE Well Existing 33-53

Onsite SVE 108 SVE Well Existing 33-53

Onsite SVE 109 SVE Well Existing 34-54

Onsite SVE 110 SVE Well Existing 33-53

Onsite SVE 111 SVE Well Existing 38-58

SVE: Soil Vapor Extraction Well

SVPM: Soil Vapor Pressure Monitoring

(SVPM) BPS1 DUP01 Air 1

TABLE 2

OFFSITE SOIL GAS MONITORING

SAMPLE NOMENCLATURE AND ANALYTICAL METHOD

SITE 1 - FORMER DRUM MARSHALLING AREA

NWIRP BETHPAGE, NEW YORK

Location Sample ID Matrix VOCs-TO15A (1)

SVPM 2001

BPS1-SVPM2001S-XXXXXX Air 1

BPS1-SVPM2001I-XXXXXX Air 1

BPS1-SVPM2001D-XXXXXX Air 1

SVPM 2002

BPS1-SVPM2002S-XXXXXX Air 1

BPS1-SVPM2002I-XXXXXX Air 1

BPS1-SVPM2002D-XXXXXX Air 1

SVPM 2003

BPS1-SVPM2003S-XXXXXX Air 1

BPS1-SVPM2003I-XXXXXX Air 1

BPS1-SVPM2003D-XXXXXX Air 1

SVPM 2004

BPS1-SVPM2004S-XXXXXX Air 1

BPS1-SVPM2004I-XXXXXX Air 1

BPS1-SVPM2004D-XXXXXX Air 1

SVPM 2006

BPS1-SVPM2006S-XXXXXX Air 1

BPS1-SVPM2006I-XXXXXX Air 1

BPS1-SVPM2006D-XXXXXX Air 1

SVPM 2007

BPS1-SVPM2007S-XXXXXX Air 1

BPS1-SVPM2007IR-XXXXXX Air 1

BPS1-SVPM2007D-XXXXXX Air 1

Duplicate (SVPM)Duplicate BPS1 DUP01- Air 1

Duplicate (SVPM) BPS1-DUP02 Air 1

Field Blank BPS1-FB2001-XXXXXX Air 1

Field Blank BPS1-FB2002-XXXXXX Air 1

VOCs: Volatile organic compounds. (Site specific list: 1,1-dichloroethane, 1,1-dichloroethene, 1,1,1-trichloroethane, 1,2-dichloroethane, cis-1,2-dichloroethene, trans-1,2-dichloroethene, trichloroethene, tetrachloroethene, vinyl chloride)

XXXXXX: Sample date. For example, BPS1-SVPM2004D-082610, would be collected on August 26, 2010.

1 : 21-Day results from Navy-approved laboratory via method TO-15.

DUP: Duplicate sample

SVPM: Soil Vapor Pressure Monitoring

FB: Field Blank (Ambient Air Sample)

FIGURES

MELISSA.CUSHING

Text Box

SVE102D

SVE102I

SVE101D

SVE101I

SVE103D

SVE103I

SVE104D

SVE104I

SVE105D

SVE105I

SVE106D

SVE106I

BPS1SVPM2007S

BPS1SVPM2001S

BPS1SVPM2001I

BPS1SVPM2001D

BPS1SVPM2006S

BPS1SVPM2006I

BPS1SVPM2006D

BPS1SVPM2004S

Site 1

Plant 3

Plant 17

Flow Monitoring Station

SVE111D

SVE110D

SVE109D

SVE108D

SVE107D

Treatment Building

BPS1SVPM2007D

BPS1SVPM2004I

BPS1SVPM2004D

BPS1SVPM2003S

BPS1SVPM2003I

BPS1SVPM2003D

BPS1SVPM2002S

BPS1SVPM2002I

BPS1SVPM2007I

BPS1SVPM2002D

th

St th

St

Maple Ave

Sycamore Ave

³

125 1250 Feet

SVE AND SVPM LOCATION MAP

SITE 1 - FORMER DRUM MARSHALLING AREA

NAVAL WEAPONS INDUSTRIAL RESERVE PLANT

BETHPAGE, NEW YORK

DATE

AS NOTED

SCALE

DATECHECKED BY

DRAWN BY

MMC 12/6/11

RMS 12/6/11

DATEREVISED BY

CONTRACT NUMBER

APPROVED BY

REVFIGURE NO.

APPROVED BY

DATE

DATE

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CTO NUMBER

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APPENDICES

APPENDIX A

NYSDEC LETTER

New York State Department of Environmental Conservation Division of Environmental Remediation Remedial Bureau A, 11th Floor 625 Broadway, Albany, New York 12233-7015 Phone: (518) 402-9620· Fax: (518) 402-9022 Website: www.dec.ny.qov Joe Martens

Commissioner

July 27,2011

Lora Fly Naval Facilities Engineering Command MidLant Building Z-144 9742 Maryland Avenue Norfolk,VA 23511-3095

RE: Naval Weapons Industrial Reserve Plant Site Bethpage, Nassau County NYSDEC site No.1-30-003B.

Dear Ms. Fly:

The Naval Facilities Engineering Command Midlant has submitted a document entitled "Data Summary Report and Home Evaluation, January to March 2011, Soil Vapor Intrusion Investigation, Site I-Fonner Drum Marshalling Area, NWIRP Bethpage, June 2011." This report has been reviewed by the New York State Department of Environmental Conservation ( NYSDEC) and the New York State Department of Health (NYSDOH). By means of this letter, the NYSDEC approves the Data Summary Report and has the following comments to be included in the Operation, Maintenance and Monitoring (OMM) and ultimate removal of the air purifying units and sub-slab depressurization systems related to Site 1 Fonner Drum Marshalling Area of the NWlRP Bethpage facility.

1. Since the Site 1 Soil Vapor Extraction (SVE) system will be acting as the sole soil vapor intrusion mitigation system for impacted or potentially impacted homes, the engineer should include a system of periodic pressure differential measurements that confinns the potential for soil vapor intrusion to impact the homes continues to be mitigated.

2. The soil vapor extraction system in place at Site 1has a fonnal operations, monitoring and maintenance (OM&M) plan in place for the machinery associated with SVE system that does not include sampling to evaluate monitoring the SSD systems mitigation of the potential for soil vapor intrusion. Therefore, an OM&M plan should be developed and submitted documenting the basic procedures and schedule for conducting pressure measurements and sampling of the soil vapor pressure monitoring points, for the measurements of pressure differentials and/or any additional recommendations of the engineer.

Overall the NYSDEC and the NYSDOH concur with the report's recommendations that there is no longer a need for the Navy to support the operation of air purifying units and sub-slab depressurization systems installed in these homes, and that these systems can be removed at the request of the home owner. The scope of activities and the sampling frequency cited are adequate, with the addition of the appropriate pressure differential readings and/or additional recommendations of the engineer, to be submitted in the OMM plan to be put in place, to ensure that the SVE system is functioning as the soil vapor intrusion mitigation system for the impacted and potentially impacted homes in the area.

In the meantime, if you have any questions, please contact me directly at (518)402-9620.

Sincerely, f5:c1:j~ Project Engineer .E/U Remedial Bureau A Division of Environmental Remediation ecc: J. Swartwout/So ScharflFile W. Parish, Region 1 S. Karpinski, NYSDOH J. De Franco NCDHS C. Stein, USEPA D. Brayack, Tetra Tech NUS R. Sok, Tetra Tech NUS

EDOCS: 13003B-VapoT Intrusion: June 2011 Data Summary Report Comment Letter

APPENDIX B

SVPM AND SVE CONSTRUCTION LOGS

APPENDIX C

SVE, SVPM VACUUM MEASUREMENT, AND SOIL

GAS SAMPLING LOG SHEETS

NWIRP BETHPAGE - SITE 1 - OFFSITE SOIL VAPOR MONITORING

SVPM VACUUM/PRESSURE MEASUREMENT SHEET

Site Name: Site 1 - Former Drum Marshalling Area Project /CTO No.:

Company: Personnel:

Weather Conditions: Measuring Device:

SVPM Date Time Pressure ID Number (inches of water)

BPS1-SVPM2001S

BPS1-SVPM2001I

BPS1-SVPM2001D

BPS1-SVPM2002S

BPS1-SVPM2002I

BPS1-SVPM2002D

BPS1-SVPM2003S

BPS1-SVPM2003I

BPS1-SVPM2003D

BPS1-SVPM2004S

BPS1-SVPM2004I

BPS1-SVPM2004D

BPS1-SVPM2006S

BPS1-SVPM2006I

BPS1-SVPM2006D

BPS1-SVPM2007S

BPS1-SVPM2007I

BPS1-SVPM2007D

Comments and Observations

NWIRP BETHPAGE - SITE 1 - OFFSITE SOIL VAPOR MONITORING

SVE CONTAINMENT SYSTEM MEASUREMENT SHEET

Site Name: Site 1 - Former Drum Marshalling Area Project /CTO No.:

Company: Personnel:

Weather Conditions: Measuring Device:

SVE Date Time Pressure ID Number (inches of water)

Conex Box - Main

SVE 101I

SVE 101D

SVE 102I

SVE 102D

SVE 103I

SVE 103D

SVE 104I

SVE 104D

SVE 105I

SVE 105D

SVE 106I

SVE 106D

SVE 107 NA

SVE 108 NA

SVE 109 NA

SVE 110 NA

SVE 111 NA

SVE System Data Date Time Measurement Comments and Observations

Blower Running

Flow Rate

Temp (Pre-Carbon)

Pressure (Pre-Blower)

Moisture In Header

Valve Position Comments and Observations

SOIL GAS SAMPLING LOG SHEET

Project Site Name: Sample ID No.:

Project/CTO No.: Sample Location:

Company: Sampled By:

SAMPLING DATA:

Date: Wind speed Wind

Direction Ambient temperature Barometric Pressure

Relative Humidity

Time: (Visual) (estimated) (°F) (in.) (%)

Container Type:

Duplicate Sample (if collected)

Canister # Filter Type/Flow

Start Time Vacuum in Hg in Hg End Time Vacuum in Hg in Hg

Purge Data (Time) Flow Rate

(mL/minute) Total volume

PID

Reading

(ppm)

Helium Reading

(ppm)

Notes:

Weather Description

Comments/Observations

NWIRP Bethpage Site 1

Canister # Filter Type/Flow

APPENDIX D

TERMINATION OF MITIGATION SYSTEM

OPERATIONS - ENCLOSURE FROM NYSDEC

LETTER (JANUARY 24, 2012)

SVE AND SVPM CONSTRUCTION DETAILS

TABLE 2 - OFFSITE SOIL GAS MONITORING