File 6a NWIRP Bethpage Site 1 Q3 2024 Quarterly Ops Report.pdf

Quarterly Operations Report Third Quarter 2024

Soil Vapor Extraction Containment System

Site 1, Former Drum Marshalling Yard Naval Weapons Industrial Reserve Plant

Bethpage, New York

Contract No. N40085-23-D-0073 Contract Task Order No. N4008524F4472

December 2024

Prepared for:

Naval Facilities Engineering Systems Command Mid-Atlantic

9324 Virginia Avenue Norfolk, VA 23511

Prepared by:

KOMAN Government Solutions, LLC 180 Gordon Drive, Suite 110

Exton PA, 19341

(610) 363-3000

Site 1 Third Quarter 2024 Operations Report NWIRP Bethpage, NY December 2024 ii

Quarterly Operations Report

Naval Weapons Industrial Reserve Plant

Contract No. N40085-23-D-0073 Contract Task Order No. N4008524F4472

December 2024

Prepared for:

Naval Facilities Engineering Systems Command Mid-Atlantic 9324 Virginia Avenue

Norfolk, VA 23511

1/2/2024

Patrick Schauble Date Program Manager

1/2/2024

Robert Gregory Date Project Manager iii

TABLE OF CONTENTS

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

1.1 Site Location .............................................................................................................. 1-1

1.2 Background ................................................................................................................ 1-1

1.3 Project Overview and Objective ................................................................................ 1-2

1.4 SVECS Overview ...................................................................................................... 1-2

2.0 SVECS OPERATION AND MAINTENANCE ............................................................ 2-1

2.1 Routine Maintenance Activities ................................................................................. 2-1

2.2 Non-Routine Maintenance / Site Activities ................................................................ 2-1

3.0 SVECS MONITORING ................................................................................................. 3-1

3.1 Monthly Air Quality Monitoring ............................................................................... 3-1

3.2 Quarterly Air Quality Monitoring of SVEWs ........................................................... 3-1

3.3 Quarterly Soil Vapor Pressure Monitoring of SVEWs and Off-site SVPMs ............ 3-2

3.4 Annual Vapor Quality Monitoring of Off-site SVPMs .............................................. 3-2

3.5 Soil Vapor Quality Concentration Trends .................................................................. 3-2

4.0 CONCLUSIONS AND RECOMMENDATIONS ........................................................ 4-1

5.0 REFERENCES ................................................................................................................ 5-1

FIGURES

FIGURE 1 Site Location Map

FIGURE 2 Site 1 Area and Vicinity

FIGURE 3 Site Plan – Existing Layout – Soil Vapor Extraction Containment System

FIGURE 4 Soil Vapor Extraction Containment System Layout Plan

FIGURE 5 Third Quarter 2024 Vapor Analytical Map – Select VOC Concentrations – SVEWs

FIGURE 6 Third Quarter 2024 Offsite Soil Vapor Pressure Monitoring – SVPMs

TABLES

TABLE 1 Vapor Monitoring Results – July 2024

TABLE 2 Vapor Monitoring Results – August 2024

TABLE 3 Vapor Monitoring Results – September 2024

TABLE 4 Third Quarter 2024 Vapor Monitoring Results Summary of SVE Wells

TABLE 5 Quarterly Vapor Monitoring Results of SVE Wells First Quarter 2023 through

TABLE 6 Third Quarter 2024 Off-Site Soil Vapor Pressure Monitoring of SVPMs iv

APPENDICES

APPENDIX A NYSDEC Air Discharge Limit Documentation

APPENDIX B Historical SVE Monitoring Results through Fourth Quarter 2022

APPENDIX C Vapor Concentration Trend Graphs of Select VOCs – SVEWs v bgs

CTO

DAR

DCA

DCE

DoD

ELAP

FMS

GOCO

i.w.

KGS

NAVFAC

Navy

NELAC

NG

NWIRP

NYSDEC

NYSDOH

O&M

PCB

PCE

PID

scfm

SVE

SVECS

SVEW

SVOC

SVPM

TCA

TCE

TCL

TtNUS μg/m3

VC

VGAC

VOC

Acronyms and Abbreviations below ground surface

Contract Task Order

Division of Air Resources dichloroethane dichloroethene

Department of Defense

Environmental Laboratory Accreditation Program

Flow Monitoring Station

Government Owned Contractor-Operated inches of water column

KOMAN Government Solutions, LLC

Naval Facilities Engineering Systems Command

United States Department of the Navy

National Environmental Accreditation Conference

Northrop Grumman

Naval Weapons Industrial Reserve Plant

New York State Department of Environmental Conservation

New York State Department of Health

Operation and Maintenance polychlorinated biphenyls tetrachloroethene photoionization detector standard cubic feet per minute soil vapor extraction soil vapor extraction containment system soil vapor extraction well semi-volatile organic compound soil vapor pressure monitor trichloroethane trichloroethene target compound list

Tetra Tech NUS, Inc.

micrograms per cubic meter vinyl chloride vapor–phase granular activated carbon volatile organic compound

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1.0 INTRODUCTION

KOMAN Government Solutions, LLC (KGS) has prepared this Third Quarter 2024 Operations Report for the Soil Vapor Extraction Containment System (SVECS) at Site 1, Former Drum Marshalling Area, at the

Naval Weapons Industrial Reserve Plant (NWIRP) in Bethpage, New York. This report has been prepared for the United States Department of the Navy (Navy), Naval Facilities Engineering Systems

Command (NAVFAC), Mid-Atlantic, under Contract No. N40085-23-D-0073, Contract Task Order

(CTO) No. N4008524F4472. This Third Quarter 2024 Operations Report details activities that occurred from July 2024 to September 2024. Data were collected and operational activities were performed by

KGS in accordance with the following documents:

Final Tier II Sampling and Analysis Plan, Operations, Maintenance, and Monitoring of the SVECS, Site 1, Naval Weapons Industrial Reserve Plant, Bethpage, New York, prepared by KGS in January 2023 (KGS, 2023a).

Revised Final Operation & Maintenance Plan for Soil Vapor Extraction Containment System Site 1, Former Drum Marshalling Yard at Naval Weapons Industrial Reserve Plant Bethpage, New York, Revision 2.0, prepared by KGS in November 2023 (KGS, 2023b), hereafter referred to as the “O&M Manual.”

1.1 Site Location

NWIRP Bethpage is located in east central Nassau County, Long Island, New York, approximately 30 miles east of New York City. In the late 1990s, the Navy's property totaled approximately 109.5 acres and was formerly a Government Owned Contractor-Operated (GOCO) facility that was operated by

Northrop Grumman (NG) until September 1998. NWIRP Bethpage was bordered on the north, west, and south by property owned, or formerly owned, by NG that covered approximately 550 acres, and on the east by a residential neighborhood. The Navy currently retains approximately nine acres of the former

NWIRP, including Site 1, which lies within the fenced area of NWIRP Bethpage and is located east of

Plant No. 3, west of 11th Street, and north of Plant 17 South (Figures 1 and 2).

1.2 Background

NWIRP Bethpage was established in 1943. Since inception, the primary mission of the facility was the research, prototyping, testing, design engineering, fabrication, and primary assembly of military aircraft.

Historical operations that resulted in hazardous material generation at the facility included metal finishing processes, maintenance operations, painting of aircraft and components, and other activities that involve aircraft manufacturing. Wastes generated by plant operations were disposed of directly into drainage sumps, dry wells, and/or on the ground surface, resulting in the disposal of a number of hazardous wastes, including volatile organic compounds (VOCs), semi-volatile organic compounds (SVOCs), polychlorinated biphenyls (PCBs), and inorganic analytes (chromium and cadmium) at the site. Some of these contaminants have migrated from the source area to surrounding areas, including the soils at these sites and the groundwater beneath and downgradient of the NWIRP Bethpage property. NWIRP

Bethpage is currently listed by the New York State Department of Environmental Conservation

(NYSDEC) as an “inactive hazardous waste site” (#1-30-003B).

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Soils at Site 1 consist mainly of unconsolidated sediments that overlie crystalline bedrock. A clay unit is present near the groundwater table (50 feet below ground surface [bgs]) at the southeast corner of the site.

This clay unit is suspected to be a source of chlorinated solvents that are migrating into the overlying soil gas and the source of off-site VOCs in soil vapor (KGS, 2023b).

Chlorinated solvents including trichloroethene (TCE), tetrachloroethene (PCE), and 1,1,1-trichloroethane

(TCA) have been identified as the VOCs of interest in soil gas at the site. Concentrations greater than

1,000 micrograms per cubic meter (μg/m3) of soil vapor have been directly associated with Site 1 activities and historical environmental data, and based on preliminary screening, exceed guidelines established by the New York State Department of Health (NYSDOH) for sub-slab soil vapor concentrations at the time as provided in Guidance for Evaluating Soil Vapor Intrusion in the State of

New York (NYSDOH, 2006). Updates to the evaluation matrices were established in May 2017

(NYSDOH, 2017). The 2017 updates lowered the sub-slab soil vapor screening value for TCE from 250 μg/m3 to 60 μg/m3; the screening values for PCE and 1,1,1-TCA remained at 1,000 μg/m3 (NYSDOH, 2017). Of these compounds, TCE is the primary VOC of concern. Mitigation of TCE contamination in accordance with NYSDOH guidance is expected to remediate other VOCs associated with the site.

PCBs, cadmium, and chromium have also been identified in site soils at concentrations requiring remediation. The majority of these chemicals have been detected in the central portion of Site 1 and are being addressed via a separate remedial action (KGS, 2023b).

Prior to implementation of the SVECS, the mean concentrations of VOCs in soil gas samples collected along the eastern fence-line were 41,128 µg/m3 of TCE, 381 µg/m3 of PCE, and 20,634 µg/m3 of 1,1,1-

TCA. The maximum concentrations of VOCs in the soil gas samples were 180,000 µg/m3 of TCE, 1,200 µg/m3 of PCE, and 90,000 µg/m3 of 1,1,1-TCA (KGS, 2023b).

1.3 Project Overview and Objective

The remedial objective for this project is to use an on-site soil vapor extraction (SVE) system to prevent further off-site migration of VOC-contaminated soil vapor and to the extent practical, capture contaminated soil vapor with a TCE concentration greater than 250 g/m3. A secondary objective of this project is to address soil vapor with a TCE concentration greater than 5 g/m3. The SVECS is an interim action intended to address migration of VOCs in contaminated soil vapors. It is expected to operate continuously 24 hours/day, seven days/week, with the exception of maintenance and adjustment periods, until the remedial objectives are met (KGS, 2023b).

1.4 SVECS Overview

The SVECS consists of soil vapor extraction, soil vapor monitoring, and soil vapor treatment. Twelve

SVE wells (SVEWs) are located along the eastern boundary of Site 1 in six clusters, each consisting of one intermediate well and one deep well. Intermediate wells SVE-101I, SVE-102I, SVE-103I, SVE-104I, SVE-105I, and SVE-106I have a screened interval between 25 and 35 feet bgs. Deep wells SVE-101D, SVE-102D, SVE-103D, SVE-104D, SVE-105D, and SVE-106D have a screened interval between 40 and

60 feet bgs. The groundwater table fluctuates between approximately 50 and 55 feet bgs. Each SVEW is operated at a flow rate such that the combined total flow rate is approximately 300-400 standard cubic feet per minute (scfm) of soil vapor. Each intermediate depth SVEW requires an approximate vacuum of

1-3 four inches of water column (i.w.) and each deep SVEW requires a vacuum of up to 20 i.w. in order to extract the targeted flow rates. The 12 SVEWs have been piped below the ground to the Flow Monitoring

Station (FMS), where flow, vacuum, and vapor quality are monitored. Within the FMS, the discharge lines from the individual SVEWs have been equipped with a 2-inch flow control butterfly valve, a vacuum gauge, and a sampling port. The sampling port is utilized to measure the flow rate from an individual well using a portable velocity meter and to collect vapor samples. All the SVE lines collect into a single manifold within the FMS and from this location a single underground pipeline has been routed approximately 1,400 linear feet to the Treatment Building (Building 03-35). Five additional

SVEWs (SVE-107D, SVE-108D, SVE-109D, SVE-110D, and SVE-111D) were installed in October

2011 to address potential VOCs under Plant No. 3 and the South Warehouse. These five wells were connected directly to the pipeline leading to the Treatment Building downstream of the FMS; no sampling ports were established for these wells. During the Second Quarter 2022, six additional SVEWs (SVE-

112D, SVE-113D, SVE-114D, SVE-115D, SVE-116D and SVE-117D) were brought online to address residual VOC concentrations in the central area of Site 1. A separate FMS was constructed in 2022 for these six SVEWs that includes sampling ports for each well. Sampling of these additional SVEWs began in September 2022. A site plan depicting all SVEW locations is included as Figure 3.

The SVECS is housed within the Treatment Building, an existing and unoccupied building designated as

Building 03-35. The treatment system consists of a moisture separator, two SVE blowers, and a 5,000-pound vapor-phase granular activated carbon (VGAC) unit for removal of chlorinated VOCs from the off-gas. Soil vapor that enters the Treatment Building first passes through the moisture separator tank where any condensate is separated. To date, no condensate has formed in this tank. The vapor is then passed through an air filter and SVE blower and then treated in the VGAC unit. The treated vapor is discharged from the VGAC via an exhaust stack. The SVECS has a control panel comprised of mechanical interlocks and relays for local operation. A System Layout Plan is presented in Figure 4.

The off-gas from the SVECS is monitored for chlorinated VOCs as identified in the NYSDEC Division of Air Resources (DAR) permit equivalent effluent limitations and updated approval documentation

(Appendix A) and monitoring requirements (KGS, 2023a). Samples are submitted to a NYSDOH-certified, National Environmental Laboratory Accreditation Conference (NELAC)-certified, and

Department of Defense (DoD) Environmental Laboratory Accreditation Program (ELAP)-accredited laboratory, Eurofins Air Toxics, LLC located in Folsom, California, for analysis of VOCs by modified

Method TO-15. Prior to January 2014, samples were analyzed for target compound list (TCL) VOCs. As of January 2014, upon approval by NYSDEC and NYSDOH, samples are analyzed for site-specific

VOCs. The site-specific VOCs are: 1,1,1-TCA, 1,1-dichloroethane (DCA), 1,1-dichloroethene (DCE), 1,2-DCA, cis-1,2-DCE, PCE, trans-1,2-DCE, TCE, and vinyl chloride (VC).

A total of 18 soil vapor pressure monitor (SVPM) / soil gas monitoring points have been installed in the residential neighborhood east of Site 1 at NWIRP Bethpage (Figure 3). These off-site monitoring points consist of eight previously existing SVPMs as well as 10 SVPMs installed in September 2012. Soil vapor pressure readings from the SVPMs are collected quarterly and used to evaluate the SVECS vacuum field.

In addition, analytical results of vapor samples collected annually from these locations and the soil vapor pressure readings are used to further evaluate the SVECS operation and the potential for vapor intrusion.

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2.0 SVECS OPERATION AND MAINTENANCE

While designed to run autonomously, the SVECS requires regular visits by an operator to record and adjust operational parameters and to perform scheduled maintenance. The SVECS is equipped with telemetry that will alert an on-call operator in the event of a plant shutdown.

2.1 Routine Maintenance Activities

Routine maintenance activities at the SVECS were performed during the operator's weekly visits during this reporting period. These activities include general site inspections (of the grounds, buildings, doors, and locks), collection of operational data (vapor flowrates, pressures, vacuums, temperature, and photoionization detector [PID] readings), adjustment of system valves, collection of vapor samples (on a monthly and quarterly basis), collection/disposal of condensate if needed, cleaning of filters, switching of lead/lag blower assignments, and preventive maintenance of system equipment.

2.2 Non-Routine Maintenance / Site Activities

Non-routine activities / repair activities required for the SVECS during the Third Quarter 2024 reporting period are listed below:

There were no non-routine activities during the Third Quarter 2024.

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3.0 SVECS MONITORING

Several process vapor samples are collected on a monthly basis to monitor the SVECS operation. These samples consist of an influent sample (as well as a duplicate sample), located immediately prior to the

VGAC unit, and an effluent sample, located after the VGAC unit and before the exhaust stack. Vapor samples are also collected from the 18 active SVEWs on a quarterly basis to monitor the capture of the contaminated soil vapor by the SVEWs. In addition, quarterly pressure measurements are collected from the 18 SVEWs and the 18 SVPMs to monitor the SVECS vacuum field, and soil vapor sampling from the

18 SVPMs is conducted annually (generally in the winter) to evaluate the effectiveness of the SVECS.

The first annual soil vapor sampling event was conducted in the winter 2012-2013. The twelfth annual sampling event was conducted in February 2024.

3.1 Monthly Air Quality Monitoring

Analysis of influent and effluent vapor sample locations is performed to evaluate VOC mass removal and the effectiveness of the VGAC adsorption unit. Time-integrated vapor samples are collected using 6-liter summa canisters with 30-minute flow regulators.

Treated off-gas discharged at the exhaust stack is subject to emissions limitations. Initially, discharge goals were derived from calculations submitted by the Navy and accepted by the NYSDEC in the

February 2010 DAR permit equivalent application. In September 2011, the Navy submitted an evaluation proposing revised discharge goals (KGS, 2023b), which NYSDEC concurred with in October 2011. A copy of this documentation is included as Appendix A.

Summaries of the monthly treatment system influent and effluent vapor sampling results for July, August, and September 2024 (Third Quarter) are presented in Tables 1, 2, and 3, respectively. Emission rate calculations for both the influent stream (prior to VGAC treatment) and effluent stream (following VGAC treatment) and the computed monthly mass recoveries are also presented. Emission rates of the influent stream as well as mass recovery are calculated to monitor progress and determine when influent concentrations have reached levels at which vapor treatment via carbon adsorption is no longer required.

The data presented in Tables 1, 2, and 3 demonstrate that all constituents were within the effluent emission rate guidelines (Appendix A) during the current reporting period.

All raw analytical data are provided under a separate cover.

3.2 Quarterly Air Quality Monitoring of SVEWs

Time-integrated vapor samples are collected quarterly using 6-liter summa canisters with 30-minute flow regulators at six intermediate and twelve deep SVEWs. The samples are collected for the purpose of tracking and documenting the performance of the SVECS (KGS, 2023a). Table 4 presents the data collected on 17 September 2024 (Third Quarter 2024) for the 18 active SVEWs.

Analytical results of select VOCs (1,1,1-TCA, PCE, and TCE) detected at the 18 SVEWs active during the Third Quarter are presented on Figure 5. Historical analytical results of quarterly vapor samples collected from First Quarter 2023 through the Third Quarter 2024 for the 18 SVEWs are presented in

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Table 5; analytical results generated from December 2009 through the Fourth Quarter 2022 are presented in Appendix B.

3.3 Quarterly Soil Vapor Pressure Monitoring of SVEWs and Off-site SVPMs

Soil vapor pressure readings are collected quarterly from the 18 active SVEWs and 18 SVPMs to monitor the SVECS vacuum field. Soil vapor pressure readings from these locations were collected on 17

September. Results of the Third Quarter vapor pressure monitoring event are presented in Table 6.

The vapor pressure readings collected from the 18 SVEWs ranged between -1.0 to -10.0 i.w. Readings from the 12 SVEWs located along the boundary of the site (Table 6) ranged from -1.0 to -10.0 i.w.

indicating that a vacuum has been maintained along the fence line. The vapor pressure readings collected from the offsite SVPMs ranged between -0.06 to -0.45 i.w. indicating that a vacuum has also been maintained in the offsite areas. Pressure readings from the 18 SVPMs are presented on Figure 6.

3.4 Annual Vapor Quality Monitoring of Off-site SVPMs

Time-integrated vapor samples are collected annually using 6-liter summa canisters with 30-minute flow regulators at 18 SVPM locations. The annual 2024 SVPM samples were collected on 21 February 2024;

analytical results from the SVPM monitoring event were included in the First Quarter 2024 Operations report submitted in June 2024 (KGS, 2024). PCE was detected at 4 of the 18 sampling locations, ranging from 1.1 J µg/m3 at SVPM-2006D to 1.4 J µg/m3 at SVPM-2003D. TCE was detected at 8 of the 18 sampling locations, ranging from 1.9 J µg/m3 at SVPM-2002I to 29 µg/m3 at SVPM-2002D. All detected concentrations were below the NYSDOH sub-slab screening value of 1,000 µg/m3 for PCE, and 60 µg/m3 for TCE.

3.5 Soil Vapor Quality Concentration Trends

Historical vapor analytical results for 18 SVEWs (SVE-101I through SVE-106D and SVE-112D through

SVE-117D) through the Third Quarter are presented in Table 5 and in Appendix B. In addition, concentration trends of select VOCs for the SVECS combined influent (1,1,1-TCA, PCE, TCE, and total

VOCs) and each of the 18 SVEWs (1,1,1-TCA, PCE, and TCE) are presented in Appendix C.

Concentration trends observed in 18 SVEWs through the Third Quarter 2024 are discussed below.

Combined Influent: Overall VOC concentrations in the combined influent increased during the

Third Quarter 2024 relative to the Second Quarter 2024, with total VOC concentrations of 821 µg/m3 in July (Table 1), 942 µg/m3 in August (Table 2), and 905 µg/m3 in September (Table 3).

TCE, PCE and 1,1,1-TCA concentrations remain approximately one to two orders of magnitude below baseline concentrations measured in December 2009 (42,000 µg/m3 TCE, 7,900 µg/m3

PCE, and 13,000 µg/m3 1,1,1-TCA).

SVE-101I: Concentrations measured at this location (17 µg/m3 TCE, 13 µg/m3 PCE, and 0.90 J µg/m3 1,1,1-TCA) increased in the Third Quarter 2024 relative to concentrations measured in the

Second Quarter 2024 (Table 5). All concentrations are four to five orders of magnitude below baseline concentrations measured in December 2009 (180,000 µg/m3 TCE, 1,700 µg/m3 PCE, and

51,000 µg/m3 1,1,1-TCA).

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SVE-101D: Concentrations measured at this location (110 µg/m3 TCE, 12 µg/m3 PCE, and 1.4 J µg/m3 1,1,1-TCA) increased in the Third Quarter 2024 relative to concentrations measured in the

Second Quarter 2024 (Table 5). All concentrations are two to four orders of magnitude below baseline concentrations measured in December 2009 (100,000 µg/m3 TCE, 3,200 µg/m3 PCE, and

26,000 µg/m3 1,1,1-TCA).

SVE-102I: Concentrations measured at this location (16 µg/m3 TCE, 4.0 J µg/m3 PCE, and 2.5 J µg/m3 1,1,1-TCA) increased in the Third Quarter 2024 relative to concentrations measured in the

Second Quarter 2024 (Table 5). All concentrations are one to two orders of magnitude below the maximum concentrations measured in June 2010 (300 µg/m3 TCE, 17 µg/m3 PCE, and 13 µg/m3

1,1,1-TCA).

SVE-102D: The concentrations measured at this location (17 µg/m3 TCE, 8.0 µg/m3 PCE, and

1.4 J µg/m3 1,1,1-TCA) increased in the Third Quarter 2024 relative to concentrations measured in the Second Quarter 2024 (Table 5). All concentrations are one to two orders of magnitude below baseline concentrations measured in December 2009 (440 µg/m3 TCE, 10 µg/m3 PCE, and

130 µg/m3 1,1,1-TCA).

SVE-103I: The concentration of 1,1,1-TCA measured at this location remained at the non-detect level while the concentrations of TCE (2.2 J µg/m3) and PCE (3.3 J µg/m3) increased slightly in the Third Quarter 2024 relative to concentrations measured in the Second Quarter 2024 (Table

5). All concentrations are two orders of magnitude below the baseline concentrations measured in December 2009 (900 µg/m3 TCE, 580 µg/m3 PCE, and 900 µg/m3 1,1,1-TCA).

SVE-103D: Concentrations of TCE and 1,1,1-TCA measured at this location remained at the non-detect level and the concentration of PCE (3.2 J µg/m3) increased in the Third Quarter 2024 relative to concentrations measured in the Second Quarter 2024 (Table 5). All concentrations remain approximately four orders of magnitude below baseline concentrations measured in

December 2009 (3,100 µg/m3 TCE, 20,000 µg/m3 PCE, and 3,000 µg/m3 1,1,1-TCA).

SVE-104I: Concentrations of TCE and 1,1,1-TCA measured at this location remained at the non-detect level and the concentration of PCE (1.8 J µg/m3) increased in the Third Quarter 2024 relative to the non-detect value measured in the Second Quarter 2024 (Table 5). All concentrations are three to four orders of magnitude below baseline concentrations measured in

December 2009 (710 µg/m3 TCE, 3,100 µg/m3 PCE, and 730 µg/m3 1,1,1-TCA).

SVE-104D: Concentrations of TCE, PCE, and 1,1,1-TCA measured at this location remained at the non-detect level in the Third Quarter 2024 (Table 5). All concentrations are three to four orders of magnitude below baseline concentrations measured in December 2009 (4,600 µg/m3

TCE, 20,000 µg/m3 PCE, and 3,600 µg/m3 1,1,1-TCA).

SVE-105I: The concentrations of 1,1,1-TCA and TCE measured at this location remained at the non-detect level while the concentration of PCE (4.5 J µg/m3) increased in the Third Quarter 2024 relative to the concentration measured in the Second Quarter 2024 (Table 5). All concentrations

3-4 are one to two orders of magnitude below baseline concentrations measured in December 2009

(76 µg/m3 TCE, 70 µg/m3 PCE, and 9.9 µg/m3 1,1,1-TCA).

SVE-105D: The concentrations of 1,1,1-TCA and TCE measured at this location remained at the non-detect level while the concentration of PCE (2.0 J µg/m3) increased slightly in the Third

Quarter 2024 relative to the concentration measured in the Second Quarter 2024 (Table 5). All concentrations are three to four orders of magnitude below baseline concentrations measured in

December 2009 (1,700 µg/m3 TCE, 2,100 µg/m3 PCE, and 550 µg/m3 1,1,1-TCA).

SVE-106I: Concentrations of TCE and 1,1,1-TCA measured at this location remained at the non-detect level while PCE decreased to non-detect in the Third Quarter 2024 (Table 5). All concentrations are three to four orders of magnitude below baseline concentrations measured in

December 2009 (1,900 µg/m3 TCE, 390 µg/m3 PCE, and 220 µg/m3 1,1,1-TCA).

SVE-106D: Concentrations of 1,1,1-TCA measured at this location remained at the non-detect level while the concentrations of TCE (1.3 J µg/m3) and PCE (3.9 J µg/m3) increased in the Third

Quarter 2024 relative to the non-detect levels measured in the Second Quarter 2024 (Table 5).

All concentrations are three to four orders of magnitude below baseline concentrations measured in December 2009 (3,400 µg/m3 TCE, 720 µg/m3 PCE, and 340 µg/m3 1,1,1-TCA).

SVE-112D: Concentrations measured at this location (78 µg/m3 TCE, 48 µg/m3 PCE, and 7.7 µg/m3 1,1,1-TCA) increased in the Third Quarter 2024 relative to concentrations measured in the

Second Quarter 2024 (Table 5). All concentrations are below baseline concentrations measured in September 2022 (160 µg/m3 TCE, 160 µg/m3 PCE, and 16 µg/m3 1,1,1-TCA).

SVE-113D: The concentration measured at this location (20 µg/m3 TCE, 23 µg/m3 PCE, and 4.0 µg/m3 1,1,1-TCA) increased in the Third Quarter 2024 relative to concentrations measured in the

Second Quarter 2024 (Table 5). All concentrations are below baseline concentrations measured in September 2022 (39 µg/m3 TCE, 72 µg/m3 PCE, and 24 µg/m3 1,1,1-TCA).

SVE-114D: Concentrations measured at this location (4,200 µg/m3, 200 µg/m3 PCE, and 1,200 µg/m3 1,1,1-TCA) increased in the Third Quarter 2024 relative to concentrations measured in the

Second Quarter 2024 (Table 5). The concentration of PCE is an order of magnitude below the baseline concentration measured in September 2022 (1,400 µg/m3) while the concentrations of

TCE (4,200 µg/m3) and 1,1,1-TCA (1,200 µg/m3) are, respectively, at or below their maximum concentrations (4,200 µg/m3 of TCE measured in October 2022 and 1,400 µg/m3 1,1,1-TCA measured in November 2023).

SVE-115D: Concentrations measured at this location (130 µg/m3 TCE, 180 µg/m3 PCE, and 11 µg/m3 1,1,1-TCA) increased notably in the Third Quarter 2024 relative to concentrations measured in the Second Quarter 2024 (Table 5). All concentrations are below baseline concentrations measured in September 2022 (200 µg/m3 TCE, 190 µg/m3 PCE, and 21 µg/m3

1,1,1-TCA).

SVE-116D: Concentrations of two VOCs measured at this location (400 µg/m3 TCE and 4,000 µg/m3 PCE) increased in the Third Quarter 2024 relative to concentrations measured in the

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Second Quarter 2024; the measured 1,1,1-TCA concentration decreased slightly in the Third

Quarter 2024 (310 µg/m3) (Table 5). All concentrations are below the baseline concentrations measured in September 2022 (700 µg/m3 TCE, 7,800 µg/m3 PCE, and 510 µg/m3 1,1,1-TCA).

SVE-117D: Concentrations of two VOCs measured at this location (70 µg/m3 TCE and 21 µg/m3

PCE) increased in the Third Quarter 2024 relative to the concentration measured in the Second

Quarter 2024 while the concentration of 1,1,1-TCA decreased slightly to 2.3 J µg/m3 in the Third

Quarter (Table 5). All concentrations are below baseline concentrations measured in September

2022 (180 µg/m3 TCE, 86 µg/m3 PCE, and 8.1 µg/m3 1,1,1-TCA.

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4.0 CONCLUSIONS AND RECOMMENDATIONS

Section 1.3 notes that the objectives of the Site 1 SVECS are to prevent further off-site migration of VOC contaminated soil vapor and to the extent practical, capture soil vapor with elevated TCE concentrations.

As shown in Table 6 for SVEWs SVE-101(I/D) to SVE106 (I/D), a vacuum field has been maintained along the eastern property boundary, and the analytical data in Table 5 indicate that the primary VOCs at three (3) of the SVEWs (SVE-104I, -104D, -and -106D) have decreased to the non-detect or trace estimated levels. The VOC concentrations at the remaining SVEWs (with limited exceptions) were detected at trace (estimated) levels. These factors indicate that the SVECS is effectively controlling off-site migration of contaminated soil vapor.

For deep SVEWs SVE-112D to SVE-117D constructed to address residual VOC contaminant levels within the central source area of Site 1, elevated levels of VOCs continue to be extracted, with concentrations measured in the Third Quarter 2024 decreasing relative to the baseline levels measured at the time of construction/activation (September 2022).

For the offsite SVPMs, the vacuum field has been maintained at all depth intervals at all six (6) monitoring locations (Table 6). In previous 2023 Quarterly Reports, it was noted that the offsite vacuum field at SVPM2006I, SVPM2007I, and SVPM2007D was not being maintained. The data for the Third

Quarter 2024 indicate that the vacuum field has been re-established at these locations. During the annual

SVPM monitoring event conducted in February 2024, low or trace (estimated) levels of TCE were measured at eight (8) of the 18 SVPMs, trace (estimated) levels of PCE were measured at four (4) of the

18 SVPMs, and 1,1,1-TCA was not detected. All measured values of TCE and PCE were well below the sub-slab soil vapor screening values for TCE (60 μg/m3) and PCE (1,000 μg/m3) (NYSDOH, 2017).

These factors indicate that the SVECS is effectively mitigating concentrations of soil vapor contaminants greater than the applicable screening values in the offsite residential area.

Based on the site conditions identified in the Third Quarter 2024, the SVECS should continue to be operated on a full-time basis to achieve continued capture of contaminated soil vapor within the central area of Site 1 and to minimize offsite migration of contaminated soil vapor. Monthly monitoring of the combined influent and effluent as well as quarterly monitoring of individual SVEWs should continue.

Quarterly and annual monitoring of the SVPMs should also continue in order to ensure that a measurable vacuum field is being maintained and that the area is being effectively treated. Periodic system adjustments should be performed to focus on areas of elevated VOCs in soil vapor while maintaining a consistent vacuum field in the off-property area.

5-1

5.0 REFERENCES

KOMAN Government Solutions, LLC. (KGS). 2023a. Final Tier II Sampling and Analysis Plan, Operations, Maintenance, and Monitoring of the SVECS, Site 1, Naval Weapons Industrial Reserve Plant, Bethpage, New York. January.

KGS. 2023b. Revised Final Operation & Maintenance Plan for Soil Vapor Extraction Containment

System, Site 1, Former Drum Marshalling Yard at Naval Weapons Industrial Reserve Plant Bethpage, New York, Revision 2.0. November.

KGS. 2024. Quarterly Operations Report, First Quarter 2024, Soil Vapor Extraction Containment

System, Site 1, Former Drum Marshalling Yard, Naval Weapons Industrial Reserve Plant Bethpage, New

York. June.

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

NYSDOH. 2017. May 2017: Updates to Soil Vapor / Indoor Air Decision Matrices.

https://www.health.ny.gov/environmental/indoors/vapor_intrusion/update.htm

Tetra Tech NUS, Inc. (TtNUS). 2011. Modification to Existing Soil Vapor Extraction Containment

System at Site 1 – Former Drum Marshalling Area, Installation of Soil Vapor Extraction Wells SVE-107D to -111D, NWIRP Bethpage, Bethpage, New York. September.

TtNUS. 2012. Final Supplemental Offsite Soil Vapor Intrusion Monitoring Plan for the Soil Vapor

Extraction Containment System, Site 1, Former Drum Marshalling Yard at Naval Weapons Industrial

Reserve Plant, Bethpage, New York. February.

FIGURES

SITE 1 AREA

Fil e:

_B eth pa ge

Sit e1

_F 1_

SL

M.

mx d

Site Location Map

180 Gordon Drive, Suite 110, Exton, PA 19341 Figure

Date:

09/15/2022 0 2,0001,000

Feet

Department of the Navy Naval Facilities Engineering Systems Command, Mid-Atlantic

KOMAN Government Solutions, LLC

Map Reference: Copyright:© 2013 National Geographic Society, i-cubed USGS 7.5 Minutes Quadrangles: Amityville, Freeport, Hicksville, Huntington, New York µ

New York Site 1, Former Drum Marshalling Area Naval Weapons Industrial Reserve Plant

Quadrangle Location Map

WAREHOUSE F

WAREHOUSE C

WAREHOUSE I

WAREHOUSE E

WAREHOUSE A

WAREHOUSE B

PLANT 3

WAREHOUSE G

WAREHOUSE KWAREHOUSE J

WAREHOUSE N

WAREHOUSE D

WAREHOUSE H

WAREHOUSE M

WAREHOUSE LBUILDING 10

th

S T th

S T

9t h

ST

8t h

ST

Maple Ave

Sycamore Ave

SITE 1

BUILDING 03-35TREATMENT BUILDING

SITE ENTRANCE

ASSEMBLY POINT

MAIN ROAD-OLD SOUTH OYSTER BAY ROAD

EMERGENCY EVACUATION/EGRESS ROUTE TO

O ld South O yster Bay R oad

Site 1 Area and Vicinity

Site 1, Former Drum Marshalling Area Naval Weapons Industrial Reserve Plant

Bethpage, New York

FIGUREDATE

180 Gordon Drive, Suite 110, Exton, PA 19341

0 200

SCALE IN FEET

209/09/2022 BETHPAGE_0922_F2_Site1_Area_Vicinity.dwg

KOMAN Government Solutions, LLC

Department of the Navy Naval Facilities Engineering Systems Command, Mid-Atlantic

WAREHOUSE I

WAREHOUSE E

WAREHOUSE A

WAREHOUSE B

PLANT 3

WAREHOUSE G

WAREHOUSE KWAREHOUSE J

WAREHOUSE N

WAREHOUSE D

WAREHOUSE H

WAREHOUSE M

WAREHOUSE L

SITE 1

BUILDING 10

SITE 4

TREATMENT

BUILDING

FLOW MONITORING

SVE-102I

SVE-102D

SVE-103I

SVE-104I

SVE-105I

SVE-106I

SVE-103D

SVE-104D

SVE-105D

SVE-106D

SVE-101I

STATION

TRAP & CLEANOUT #3

TRAP & CLEANOUT #4

TRAP & CLEANOUT #5

TRAP & CLEANOUT #1

TRAP & CLEANOUT #2

SVE-107D

SVE-108D

SVE-109D

SVE-110D

SVE-111D

SVE-101D

SVPM-2003S

th

S T th

S T

9t h

ST

Maple Ave

Sycamore Ave

SVPM-2007S

SVPM-2007D

SVPM-2007I

SVPM-2001D

SVPM-2001I

SVPM-2001S

SVPM-2006D

SVPM-2006I

SVPM-2006S

SVPM-2004S

SVPM-2004I

SVPM-2004D

SVPM-2002S

SVPM-2002I

SVPM-2002D

SVPM-2003I

SVPM-2003D

SVE-112D

SVE-113D

SVE-114D

SVE-115D

SVE-116D

SVE-117D

BETHPAGE_0922_SVESiteLayout.dwg

LEGEND

SOIL VAPOR PRESSURE MONITOR (SVPM)

CURRENT NWIRP BOUNDARY

FORMER NWIRP BOUNDARY

SVE CONTAINMENT WELL LOCATION

SOIL VAPOR EXTRACTION WELL (SVEW)

Site Plan – Existing Layout, Soil Vapor Extraction Containment System

Site 1, Former Drum Marshalling Area Naval Weapons Industrial Reserve Plant

Bethpage, New York

FIGUREDATE

180 Gordon Drive, Suite 110, Exton, PA 19341

0 160

SCALE IN FEET

309/15/2022

KOMAN Government Solutions, LLC

Department of the Navy Naval Facilities Engineering Systems Command, Mid-Atlantic

ITEM

NUMBER

NUMBER

REQUIRED

M-1 1

F-1 1

F-2 1

B-1A, B-1B

VGAC-1 1

PROCESS EQUIPMENT LIST

NAME/DESCRIPTION

MOISTURE SEPARATOR

-CONFIGURATION: VERTICAL, CYLINDRICAL

-MATERIAL OF CONSTRUCTION: CARBON STEEL, EPOXY INTERIOR

COATING, PAINT EXTERIOR COATING

-CAPACITY: 400 GALLON CONDENSATE COLLECTION

-DIMENSIONS: 5 FT DIA X 6 FEET HT, 718 GALLON

MAKE-UP AIR FILTER

-CONFIGURATION: INTAKE FILTER/SILENCER COMBINATION HOUSING

-MATERIAL OF CONSTRUCTION: CARBON STEEL, CORROSION

RESISTANCE COATING

-CAPACITY: 500 CFM AT 20 IW, 4 INCH FLANGED CONNECTION

BLOWER AIR FILTER

-CONFIGURATION: INLINE VACUUM SERVICE FILTER

-MATERIAL OF CONSTRUCTION: CARBON STEEL, CORROSION

RESISTANCE COATING

-CAPACITY: 1,200 CFM AT 35 IW, 10 INCH FLANGED CONNECTION

VAPOR-PHASE GRANULAR ACTIVATED CARBON

-CONFIGURATION: RECTANGULAR TANK

-MATERIAL OF CONSTRUCTION: CARBON STEEL, EPOXY INTERIOR

COATING, EPOXY EXTERIOR COATING

-RATING: 1,600 CFM AT 3 IW, 2,000 CFM AT 6 IW

-CAPACITY: 5,000 LBS CARBON

-DIMENSIONS: 6' X 8' FOOTPRINT, 6' 8" HT

SOIL VAPOR EXTRACTION BLOWER

-CONFIGURATION: HORIZONTAL CENTRIFUGAL

-RATING: 600 CFM AT 40 IW

-MOTOR: 7.5 HP, 460V, 3PH, 60HZ, ODP

Figure 4 lapp Typewritten Text Figure 4 lapp Text Box

Robert Gregory Typewriter 700 CFM at 34 IW upgrade in June 2020 10 HP upgrade in June 2020

Robert Gregory Line

Robert Gregory Line

WAREHOUSE I

WAREHOUSE E

WAREHOUSE A

WAREHOUSE B

PLANT 3

WAREHOUSE G

WAREHOUSE KWAREHOUSE J

WAREHOUSE N

WAREHOUSE D

WAREHOUSE H

WAREHOUSE M

WAREHOUSE L

SITE 1

BUILDING 10

SITE 4

TREATMENT

BUILDING

FLOW MONITORING

SVE-102I

SVE-102D

SVE-103I

SVE-104I

SVE-105I

SVE-106I

SVE-103D

SVE-104D

SVE-105D

SVE-106D

SVE-101I

STATION

TRAP & CLEANOUT #3

TRAP & CLEANOUT #4

TRAP & CLEANOUT #5

TRAP & CLEANOUT #1

TRAP & CLEANOUT #2

SVE-107D

SVE-108D

SVE-109D

SVE-110D

SVE-111D

SVE-101D

th

S T th

S T

9t h

ST

Maple Ave

SVE-112D

SVE-113D

SVE-114D

SVE-115D

SVE-116D

SVE-117D

BETHPAGE_0922_SVESiteLayout.dwg FIGURE

5_VOCDATA

LEGEND

CURRENT NWIRP BOUNDARY

FORMER NWIRP BOUNDARY

SVE CONTAINMENT WELL LOCATION

SOIL VAPOR EXTRACTION WELL (SVEW)

1,1,1-TCA

PCE

TCE

SVE-102D 09/17/24

1,1,1-TCA

PCE

TCE

SVE-103I 09/17/24

1,1,1-TCA

PCE

TCE

SVE-103D 09/17/24

1,1,1-TCA ND

PCE 3.2 J

TCE

SVE-104I 09/17/24

1,1,1-TCA ND

PCE 1.8 J

TCE

SVE-105I 09/17/24

1,1,1-TCA

PCE

TCE ND

SVE-105D 09/17/24

1,1,1-TCA ND

PCE 2.0 J

TCE

SVE-106I 09/17/24

1,1,1-TCA ND

PCE ND

TCE ND

SVE-106D 09/17/24

1,1,1-TCA

PCE 3.9 J

TCE 1.3 J

NOT DETECTED ABOVE LABORATORY

METHOD DETECTION LIMIT

TETRACHLOROETHENE

1,1,1-TRICHLOROETHANE

TRICHLOROETHENE

ND

PCE

1,1,1-TCA

TCE

ALL CONCENTRATIONS REPORTED IN ug/m3.

ESTIMATED VALUEJ

SVE-112D 09/17/24

1,1,1-TCA

PCE

TCE

NOT SAMPLEDNS

SVE-113D

1,1,1-TCA

PCE

TCE 20

SVE-116D 09/17/24

1,1,1-TCA 310

PCE 4,000

TCE 400

SVE-114D 09/17/24

1,1,1-TCA

PCE

TCE

SVE-117D 09/17/24

1,1,1-TCA

PCE

TCE 70

PCE

TCE

2nd Quarter 2022 Vapor Analytical Map, Select VOC Concentrations – SVEWs

Site 1, Former Drum Marshalling Area Naval Weapons Industrial Reserve Plant

Bethpage, New York

FIGUREDATE

180 Gordon Drive, Suite 110, Exton, PA 19341

0 160

SCALE IN FEET

509/15/2022

KOMAN Government Solutions, LLC

Department of the Navy Naval Facilities Engineering Systems Command, Mid-Atlantic

ND

3rd Quarter 2024

12/042024

1,200

4,200

SVE-115D 09/17/24

1,1,1-TCA 11

7.7

2.3 J

ND

4.0

SVE-101D 09/17/24

1,1,1-TCA 1.4 J

PCE 12

TCE

1.4 J

8.0

ND

ND

09/17/24

ND

4.5 J

SVE-101I 09/17/24

1,1,1-TCA 0.90 J

PCE 13

TCE 17

SVE-102I 09/17/24

2.5 J

4.0 J

SVE-104D 09/17/24

1,1,1-TCA ND

PCE ND

TCE ND

ND

3.3 J

2.2 J

WAREHOUSE I

WAREHOUSE E

WAREHOUSE A

WAREHOUSE B

PLANT 3

WAREHOUSE G

WAREHOUSE KWAREHOUSE J

WAREHOUSE N

WAREHOUSE D

WAREHOUSE H

WAREHOUSE M

WAREHOUSE L

SITE 1

BUILDING 10

SITE 4

TREATMENT

BUILDING

TRAP & CLEANOUT #3

TRAP & CLEANOUT #4

TRAP & CLEANOUT #5

TRAP & CLEANOUT #2

SVPM-2003S

th

S T th

S T

9t h

ST

Maple Ave

Sycamore Ave

SVPM-2007S

SVPM-2007D

SVPM-2007I

SVPM-2001D

SVPM-2001I

SVPM-2001S

SVPM-2006D

SVPM-2006I

SVPM-2006S

SVPM-2004S

SVPM-2004I

SVPM-2004D

SVPM-2002S

SVPM-2002I

SVPM-2002D

SVPM-2003I

SVPM-2003D

BETHPAGE_0922_SVESiteLayout.dwg

LEGEND

SOIL VAPOR PRESSURE MONITOR (SVPM)

CURRENT NWIRP BOUNDARY

FORMER NWIRP BOUNDARY

ALL PRESSURE READINGS IN INCHES OF WATER COLUMN (i.w.)

INDICATES A POSITIVE PRESSURE READING*

SVPM-2001S 09/17/24

Pressure (i.w.) -0.25

SVPM-2001I 09/17/24

Pressure (i.w.) -0.25

SVPM-2001D 09/17/24

Pressure (i.w.) -0.20

SVPM-2002S 09/17/24

Pressure (i.w.)

SVPM-2002I 09/17/24

Pressure (i.w.)

SVPM-2002D 09/17/24

Pressure (i.w.)

SVPM-2003I 09/17/24

Pressure (i.w.)

SVPM-2003D 09/17/24

Pressure (i.w.)

SVPM-2004S 09/17/24

Pressure (i.w.) -0.15

SVPM-2004I 09/17/24

Pressure (i.w.) -0.10

SVPM-2004D 09/17/24

Pressure (i.w.) -0.10

SVPM-2006S 09/17/24

Pressure (i.w.) -0.10

SVPM-2006I 09/17/24

Pressure (i.w.) -0.10

SVPM-2006D 09/17/24

Pressure (i.w.) -0.06

SVPM-2007S 09/17/24

Pressure (i.w.) -0.10

SVPM-2007I 09/17/24

Pressure (i.w.)

SVPM-2007D 09/17/24

Pressure (i.w.) -0.20

2nd Quarter 2022 Offsite Soil Vapor Monitoring, Quarterly Soil Vapor Pressure Readings - SVPMs

Site 1, Former Drum Marshalling Area Naval Weapons Industrial Reserve Plant

Bethpage, New York

FIGUREDATE

180 Gordon Drive, Suite 110, Exton, PA 19341

0 160

SCALE IN FEET

609/15/2022

KOMAN Government Solutions, LLC

Department of the Navy Naval Facilities Engineering Systems Command, Mid-Atlantic

3rd Quarter 2024

12/04/2024

-0.10

SVPM-2003S FLOW MONITORING

TRAP & CLEANOUTPr #es 1sure (i.w.) -0.20 STATION

-0.20

-0.15

-0.20

-0.45

-0.30

09/17/24

TABLES

Table 1

Site 1, Former Drum Marshalling Yard Naval Weapons Industrial Reserve Plant - Bethpage, NY

Vapor Monitoring Results July 2024

(lbs/hr) (lbs/yr) (lbs/hr) (lbs/yr) (lbs)

1,1,1-Trichloroethane 130 120 125 0.0 0.0003 2.3494 0.0000 0.0000 0.1995 1,1-Dichloroethane 2.6 J 2.4 J 2.5 0.0 0.0000 0.0470 0.0000 0.0000 0.0040 1,1-Dichloroethene 0.0 0.0 0.0 0.0 0.0000 0.0000 0.0000 0.0000 0.0000 1,2-Dichloroethane 0.0 0.0 0.0 0.0 0.0000 0.0000 0.0000 0.0000 0.0000 cis-1,2-Dichloroethene 53 54 54 0.0 0.0001 1.0056 0.0000 0.0000 0.0854 Tetrachloroethene 280 270 275 0.0 0.0006 5.1688 0.0000 0.0000 0.4390 trans-1,2-Dichloroethene 0.0 0.0 0 0.0 0.0000 0.0000 0.0000 0.0000 0.0000 Trichloroethene 370 360 365 0.0 0.0008 6.8603 0.0000 0.0000 0.5827 Vinyl Chloride 0.0 0.0 0.0 0.0 0.0000 0.0000 0.0000 0.0000 0.0000

Total VOCs 0.0018 15.4311 0.0000 0.0000 1.3106

Notes:

All samples were analyzed for site-specific VOCs by modified method TO-15.

Average Monthly Vapor Temp (ºF) = 117 Average Monthly Flowrate (cfm) = 626 Average Monthly Flowrate (scfm) = 573

Operational Hours for the month = 744

(1) Emissions (lbs/hr) = Concentration (ug/m3)*(lb/454000000ug)*(0.3048^3m3/ft3)*exhaust flow (scfm)*(60min/hour)

(2) Emissions (lbs/yr) = Emissions (lbs/hour)*(8760hours/yr)

(3) Monthly Mass Removal = AVERAGE FLOWRATE (scfm) * 0.3048^3m3/ft3 * INF AVG CONC (ug/m3) * (lb/454000000ug) * 60 min/hr * OPERATIONAL TIME (hr)

Effluent

836 806 821 0.0

Compound Concentration Emission Rate (1),(2) Monthly Mass

Recovery (3)(ug/m3) Prior to Treatment Following Treatment Influent #1 Influent #2 Average

Table 2

Site 1, Former Drum Marshalling Yard Naval Weapons Industrial Reserve Plant - Bethpage, NY

Vapor Monitoring Results August 2024

(lbs/hr) (lbs/yr) (lbs/hr) (lbs/yr) (lbs)

1,1,1-Trichloroethane 140 140 140 0.0 0.0003 2.6054 0.0000 0.0000 0.2213 1,1-Dichloroethane 2.6 J 2.8 2.7 0.0 0.0000 0.0502 0.0000 0.0000 0.0043 1,1-Dichloroethene 0.0 0.0 0.0 0.0 0.0000 0.0000 0.0000 0.0000 0.0000 1,2-Dichloroethane 0.0 0.0 0.0 0.0 0.0000 0.0000 0.0000 0.0000 0.0000 cis-1,2-Dichloroethene 48 51 50 0.0 0.0001 0.9212 0.0000 0.0000 0.0782 Tetrachloroethene 320 300 310 0.0 0.0007 5.7691 0.0000 0.0000 0.4900 trans-1,2-Dichloroethene 0.0 0.0 0 0.0 0.0000 0.0000 0.0000 0.0000 0.0000 Trichloroethene 440 440 440 1.7 J 0.0009 8.1884 0.0000 0.0316 0.6955 Vinyl Chloride 0.0 0.0 0.0 0.0 0.0000 0.0000 0.0000 0.0000 0.0000

Total VOCs 0.0020 17.5344 0.0000 0.0316 1.4892

Notes:

All samples were analyzed for site-specific VOCs by modified method TO-15.

Average Monthly Vapor Temp (ºF) = 119 Average Monthly Flowrate (cfm) = 622 Average Monthly Flowrate (scfm) = 568

Operational Hours for the month = 744

(1) Emissions (lbs/hr) = Concentration (ug/m3)*(lb/454000000ug)*(0.3048^3m3/ft3)*exhaust flow (scfm)*(60min/hour)

(2) Emissions (lbs/yr) = Emissions (lbs/hour)*(8760hours/yr)

(3) Monthly Mass Removal = AVERAGE FLOWRATE (scfm) * 0.3048^3m3/ft3 * INF AVG CONC (ug/m3) * (lb/454000000ug) * 60 min/hr * OPERATIONAL TIME (hr)

Compound Concentration Emission Rate (1),(2) Monthly Mass

Recovery (3)(ug/m3) Prior to Treatment Following Treatment Influent #1 Influent #2 Average Effluent

951 934 942 1.7

Table 3

Site 1, Former Drum Marshalling Yard Naval Weapons Industrial Reserve Plant - Bethpage, NY

Vapor Monitoring Results September 2024

(lbs/hr) (lbs/yr) (lbs/hr) (lbs/yr) (lbs)

1,1,1-Trichloroethane 150 150 150 0.0 0.0003 2.8494 0.0000 0.0000 0.2342 1,1-Dichloroethane 3.2 3.1 3.15 0.0 0.0000 0.0598 0.0000 0.0000 0.0049 1,1-Dichloroethene 0.95 J 0.83 J 0.9 0.0 0.0000 0.0169 0.0000 0.0000 0.0014 1,2-Dichloroethane 0.0 0.0 0.0 0.0 0.0000 0.0000 0.0000 0.0000 0.0000 cis-1,2-Dichloroethene 49 50 50 0.0 0.0001 0.9403 0.0000 0.0000 0.0773 Tetrachloroethene 290 290 290 0.0 0.0006 5.5088 0.0000 0.0000 0.4528 trans-1,2-Dichloroethene 1.6 J 1.2 J 1.4 0.0 0.0000 0.0266 0.0000 0.0000 0.0022 Trichloroethene 410 410 410 0.0 0.0009 7.7883 0.0000 0.0000 0.6401 Vinyl Chloride 0.0 0.0 0.0 0.0 0.0000 0.0000 0.0000 0.0000 0.0000

Total VOCs 0.0020 17.1900 0.0000 0.0000 1.4129

Notes:

All samples were analyzed for site-specific VOCs by modified method TO-15.

Average Monthly Vapor Temp (ºF) = 115 Average Monthly Flowrate (cfm) = 631 Average Monthly Flowrate (scfm) = 579

Operational Hours for the month = 720

(1) Emissions (lbs/hr) = Concentration (ug/m3)*(lb/454000000ug)*(0.3048^3m3/ft3)*exhaust flow (scfm)*(60min/hour)

(2) Emissions (lbs/yr) = Emissions (lbs/hour)*(8760hours/yr)

(3) Monthly Mass Removal = AVERAGE FLOWRATE (scfm) * 0.3048^3m3/ft3 * INF AVG CONC (ug/m3) * (lb/454000000ug) * 60 min/hr * OPERATIONAL TIME (hr)

905 905 905 0.0

Compound Concentration Emission Rate (1),(2) Monthly Mass

Recovery (3)(ug/m3) Prior to Treatment Following Treatment Influent #1 Influent #2 Average Effluent

Table 4

Site 1, Former Drum Marshalling Yard Naval Weapons Industrial Reserve Plant - Bethpage, NY

Third Quarter 2024 Vapor Monitoring Results Summary of SVE Wells

Sample ID 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 112D SVE 113D SVE 114D SVE 115D SVE 116D SVE 117D

Sample Date 09/17/24 09/17/24 09/17/24 09/17/24 09/17/24 09/17/24 09/17/24 09/17/24 09/17/24 09/17/24 09/17/24 09/17/24 09/17/24 09/17/24 09/17/24 09/17/24 09/17/24 09/17/24

Analysis by TO-15 (µg/m3)

1,1,1-Trichloroethane 0.90 J 1.4 J 2.5 J 1.4 J ND ND ND ND ND ND ND ND 7.7 4.0 1200 11 310 2.3 J

1,1-Dichloroethane ND ND ND ND ND ND ND ND ND ND ND ND ND ND 17 ND 8.9 J ND

1,1-Dichloroethene ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND

1,2-Dichloroethane ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND cis-1,2-Dichloroethene ND 5.8 ND ND ND ND ND ND ND ND ND ND 1.1 J ND 4.4 J ND 580 ND

Tetrachloroethene 13 12 4.0 J 8.0 3.3 J 3.2 J 1.8 J ND 4.5 J 2.0 J ND 3.9 J 48 23 200 180 4000 21 trans-1,2-Dichloroethene ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 9.6 J ND

Trichloroethene 17 110 16 17 2.2 J ND ND ND ND ND ND 1.3 J 78 20 4200 130 400 70

Vinyl Chloride ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND

Notes:

All samples were analyzed for site-specific VOCs by modified method TO-15.

µg/m3 = micrograms per cubic meter

ND = Not detected above method detection limit

Table 5

Site 1, Former Drum Marshalling Yard Naval Weapons Industrial Reserve Plant - Bethpage, NY

Quarterly Vapor Monitoring Results of SVE Wells First Quarter 2023 Through Third Quarter 2024

Sample ID

Sample Date 02/24/23 05/19/23 08/15/23 11/20/23 02/21/24 06/07/24 09/17/24 02/24/23 05/19/23 08/15/23 11/20/23 02/21/24 06/07/24 09/17/24

Analysis by TO-15 (µg/m3)

1,1,1-Trichloroethane 7.7 0.85 J 1.5 J ND ND ND 0.90 J 380 5.7 9.1 6.2 1.1 J ND 1.4 J

1,1-Dichloroethane ND ND ND ND ND ND ND 6.8 0.64 J 1.2 J ND ND ND ND

1,1-Dichloroethene ND ND ND ND ND ND ND ND ND 0.74 J ND ND ND ND

1,2-Dichloroethane ND ND ND ND ND ND ND ND ND ND ND ND ND ND cis-1,2-Dichloroethene ND ND ND ND ND ND ND 3.5 J 3.3 15 1.3 J 0.73 J 2.4 J 5.8

Tetrachloroethene 2.7 J 4.7 J 2.9 J 2.6 J 1.4 J 1.4 J 13 20 15 28 8.7 4.6 7.1 12 trans-1,2-Dichloroethene ND ND ND ND ND ND ND ND ND ND ND ND ND ND

Trichloroethene 30 8 20 9 2.4 J 2.8 J 17 1800 720 1000 490 97 52 110

Vinyl Chloride ND ND ND ND ND ND ND ND ND ND ND ND ND ND

Notes:

µg/m3= micrograms per cubic meter

NR = Not Recorded `

NA = Data not available

ND = Not detected above method detection limit NS = Not sampled

SVE 101DSVE 101I

Site 1, Former Drum Marshalling Yard Naval Weapons Industrial Reserve Plant - Bethpage, NY

Quarterly Vapor Monitoring Results of SVE Wells First Quarter 2023 Through Third Quarter 2024

Sample ID

Sample Date

Analysis by TO-15 (µg/m3)

1,1,1-Trichloroethane

1,1-Dichloroethane

1,1-Dichloroethene

1,2-Dichloroethane cis-1,2-Dichloroethene

Tetrachloroethene trans-1,2-Dichloroethene

Trichloroethene

Vinyl Chloride

Notes:

µg/m3= micrograms per cubic meter

NR = Not Recorded

NA = Data not available

ND = Not detected above method detection limit NS = Not sampled

02/24/23 05/19/23 08/15/23 11/20/23 02/21/24 06/07/24 09/17/24 02/24/23 05/19/23 08/15/23 11/20/23 02/21/24 06/07/24 09/17/24

ND 0.88 J 3.4 J ND ND 0.92 J 2.5 J ND ND 3.2 J 1.3 J ND ND 1.4 J

ND 1.0 J 0.63 J 0.65 J ND ND ND 0.75 J 0.67 J 0.80 J ND ND ND ND

ND ND ND ND ND ND ND…