File 1a NWIRP Bethpage Site1 OMPlan Revised Final rev2 0.pdf

Revision Date Prepared By Approved By Pages Affected

2.0 11/06/2023 R.G. Gregory P.J. Schauble All

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

Contract No. N40085-16-D-2288 Contract Task Order No. N4008517F4042

Issued:

November 2023

Prepared for:

Naval Facilities Engineering Systems Command Mid-Atlanti 9324 Virginia Avenue

Norfolk, VA 23511

Revised by:

KOMAN Government Solutions, LLC 180 Gordon Drive, Suite 110

Exton PA, 19341

(610) 363-3000

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

Contract No. N40085-16-D-2288

Contract Task Order No. N4008517F4042

Issued:

November 2023

Prepared for:

Naval Facilities Engineering Systems Command Mid-Atlantic 9324 Virginia Avenue

Norfolk, VA 23511

Revised by:

KOMAN Government Solutions, LLC 180 Gordon Drive, Suite 110 Exton, Pennsylvania 19341

11/06/2023

Patrick Schauble Date Program Manager

11/06/2023

Robert Gregory Date Project Manager

TABLE OF CONTENTS

Operation & Maintenance (O&M) Plan – Site 1 SVECS November 2023 NWIRP Bethpage, New York i

LIST OF ABBREVIATIONS AND ACRONYMS……………...……………………...……. .v

1.0 INTRODUCTION AND PURPOSE

1.1 Purpose

1.2 Organization of the O&M Plan

1.3 Using the O&M Plan

1.4 Site Location

1.5 Site History

1.6 Site Characteristics

1.7 Project Overview and Objectives

1.8 General Description of Site 1 SVECS

1.8.1 Design Flow and Influent Concentration

1.8.2 Soil Vapor Extraction

1.8.3 Soil Vapor Pressure Monitoring

1.8.4 Soil Vapor Treatment

1.8.5 Instrumentation Description

1.9 Site Security

1.10 Staffing and Training

1.10.1 Staffing

1.10.2 Training

1.11 Supporting Documentation

2.0 REGULATORY COMPLIANCE

2.1 Discharge of Treated Off-Gas

2.1.1 Air Emissions Criteria and Monitoring Requirements

2.2 Waste Storage, Transportation and Disposal

3.0 RECORDS MANAGEMENT

3.1 Introduction

3.2 Data Recording

3.2.1 Process Monitoring

3.2.2 Equipment Operation Monitoring

3.3 Laboratory Data

3.4 Inventory Monitoring and Recording

3.5 Personnel Management

4.0 PERFORMANCE MONITORING PROGRAM DESCRIPTION

4.1 Purpose

4.2 Sampling and Monitoring Objectives

4.3 Vapor Sampling Locations

4.3.1 SVEWs

4.3.2 Offsite SVPMs

5.0 HEALTH AND SAFETY

5.1 Introduction

5.2 Summary of Major Risks

5.3 Activity Hazard Analyses

5.4 Personal Protective Equipment

6.0 PROCESS DESCRIPTION AND OPERATION

NWIRP Bethpage, New York ii

6.1 System # 1 – Soil Vapor Extraction Wells

6.1.1 Major Equipment

6.1.2 System Functional Description

6.2 System #2 – Soil Vapor Monitoring

6.2.1 Major Equipment

6.2.2 System Functional Description

6.3 System #3 – Soil Vapor Treatment

6.3.1 Major Equipment

6.3.2 System Functional Description

6.3.3 Interlock Summary

7.0 OPERATIONS

7.1 Introduction

7.2 Soil Vapor Treatment

7.2.1 Equipment Specifications

7.2.2 Operation and Controls

7.3 Start-up and Shut-down Procedures

8.0 SYSTEM TROUBLESHOOTING

9.0 EQUIPMENT MAINTENANCE

9.1 Alarm Responses

9.2 Maintenance Procedures and Recording

9.2.1 Tools, Equipment, and Supplies

9.2.2 Housekeeping

9.2.3 Lubrication

9.2.4 Storage of Lubricants

9.2.5 Equipment Rotation

9.2.6 Electrical

9.3 Maintenance Schedule Matrix

9.4 Special Maintenance Procedures

9.4.1 Contaminated Condensate or Chemical Spill - Operational Response

9.4.2 Vapor-Phase Granular Activated Carbon Change-out

10.0 WASTE TRANSPORTATION AND DISPOSAL

10.1 Background

10.2 Waste Disposal Criteria and Methods

10.3 Waste Disposal Facilities

10.3.1 Disposal Facility for Hazardous Wastes

10.3.2 Disposal Facility for Non-Hazardous Wastes

10.4 Waste Transportation Contractor Requirements

10.4.1 Qualifications

10.4.2 Trucking Equipment

10.5 Waste Quantity Determination

10.6 Shipping Documentation

10.7 Safety

10.8 Spill Response and Contingency Plan

10.8.1 Spill Procedures

10.8.2 Notification

NWIRP Bethpage, New York iii

FIGURES

Figure 1-1 Site Location Map

Figure 1-2 Site 1 Area and Vicinity

Figure 1-3 Site Plan – Existing Layout

Figure 10-1 Uniform Hazardous Waste Manifest Form

Figure 10-2 Bill of Lading

Figure 10-3 Non-Hazardous Waste Label

Figure 10-4 Hazardous Waste Label

TABLES

Table 1-1 SVEW Flow and Vacuum Settings, September 2023

Table 1-2 SVEW Completion Details

Table 1-3 Trap and Cleanout Invert Depths

Table 1-4 SVPM Construction Details

Table 1-5 SVECS Emergency Telephone Numbers, Operational Years 2023-2024

Table 2-1 Air Effluent Limitations

Table 4-1 Sampling for Routine Operations

Table 4-2 Offsite Sampling / Monitoring for Routine Operations

Table 6-1 SVECS System Components

Table 6-2 System #1 SVEWs

Table 6-3 SVEW Flow and Vacuum Settings (September 2023)

Table 6-4 System #2 – Major Equipment

Table 6-5 System #2 – Instrumentation and Controls

Table 6-6 System #3 – Major Equipment

Table 6-7 System #3 – Instrumentation and Controls

Table 6-8 System #3 – Interlock Summary

Table 8-1 Soil Vapor Extraction Troubleshooting

Table 8-2 Moisture Separator Troubleshooting

Table 8-3 Blower Troubleshooting

Table 8-4 Vapor-Phase Carbon Absorber Troubleshooting

NWIRP Bethpage, New York iv

APPENDICES

Appendix A NYSDEC Air Discharge Limit Documentation

Appendix B Report Forms

Appendix C-1 Final Record Drawings – Design-Build Construction for Interim Remedial Action 2010

Appendix C-2 Drawings – Site 1 Modifications September 2011

Appendix C-3 Remedial Design – Site 1 SVECS Modifications 2020

Appendix D Manufacturers’ Specifications/Operating Manuals

Appendix E Maintenance and Monitoring Equipment and Tool List

Appendix F Preventative Maintenance Matrix

LIST OF ABBREVIATIONS AND ACRONYMS

NWIRP Bethpage, New York v

AGVIQ AGVIQ, LLC

AHA Activity Hazard Analysis APP Accident Prevention Plan APTIM Aptim Federal Services, LLC AS Air Sparge bgs Below Ground Surface CAA Clean Air Act cfm Cubic Feet per Minute COC Chain of Custody DAR Division of Air Resources DCA Dichloroethane DCE Dichloroethene DoD Department of Defense DOT Department of Transportation EHS Environmental Health and Safety ELAP Environmental Laboratory Accreditation Program FMS Flow Monitoring Station GOCO Government Owned Contractor-Operated hp Horsepower HNUS Halliburton NUS ID Identification lb/hr Pound per Hour i.w. Inches of Water LCP Local Control Panel LO/TO Lock-out and Tag-out μg/m3 Micrograms per Cubic Meter mg/kg Milligrams per Kilogram NAAQS National Ambient Air Quality Standards NAVFAC Naval Facilities Engineering Systems Command Navy United States Department of the Navy NCPD Nassau County Police Department NELAC National Environmental Laboratory Accreditation Conference NFPA National Fire Protection Association NG Northrop Grumman Corporation NTCRA Non-Time Critical Removal Action NWIRP Naval Weapons Industrial Reserve Plant NYS New York State NYSDOH New York State Department of Health NYSDEC New York State Department of Environmental Conservation O&M Operation & Maintenance OSHA Occupational Safety and Health Administration OU Operable Unit PCB Polychlorinated Biphenyl PCE Tetrachloroethene PLC Programmable Logic Controller PPE Personal Protective Equipment PVC Polyvinyl Chloride

LIST OF ABBREVIATIONS AND ACRONYMS

NWIRP Bethpage, New York vi

RCRA Resource Conservation and Recovery Act ROD Record of Decision rpm Revolutions per Minute SAP Sampling and Analysis Plan SDS Safety Data Sheet SHSO Site Health and Safety Officer SPDES State Pollution Discharge Elimination System SSD Subslab Depressurization SSHP Site Safety and Health Plan SVE Soil Vapor Extraction SVECS Soil Vapor Extraction Containment System SVEW Soil Vapor Extraction Well SVPM Soil Vapor Pressure Monitor SVOC Semi-Volatile Organic Compound TCA Trichloroethane TCE Trichloroethene TCRA Time Critical Removal Action Tetra Tech Tetra Tech, Inc.

TtEC Tetra Tech EC, Inc.

TtNUS Tetra Tech NUS US United States USEPA United States Environmental Protection Agency VC Vinyl Chloride VGAC Vapor-Phase Granular Activated Carbon VOC Volatile Organic Compound

NWIRP Bethpage, New York 1

1.0 INTRODUCTION AND PURPOSE

This Operation & Maintenance (O&M) Plan Revision 2.0 for the Soil Vapor Extraction Containment System (SVECS) for Site 1, Former Drum Marshalling Area (Figure 1-1) at the Naval Weapons Industrial Reserve Plant (NWIRP) in Bethpage, New York has been prepared for the United States Department of the Navy (Navy), Naval Facilities Engineering Systems Command (NAVFAC), Mid-Atlantic, under Contract No. N40085-16-D-2288, Task Order No.

N40085-17-F-4042. The SVECS was originally designed for the remediation of contaminated soils and shallow groundwater within the Upper Glacial Formation at Site 1 containing chlorinated volatile organic compounds (VOCs) that are present in a clay unit near the water table [Tetra Tech EC, Inc. (TtEC), 2010]. Construction of the original SVECS was performed by TtEC in 2009. Multiple modifications and expansions of the SVECS were subsequently performed by various contractors to optimize containment of VOCs in soil vapor in order to mitigate migration of VOC vapors as well as to effect remediation of contaminated soils at the site. The SVECS vacuum blower and associated vapor-phase granular activated carbon (VGAC) treatment operations are conducted in the Treatment Building (existing unoccupied building number 03-35) located within the fenced area of NWIRP Bethpage (Figure 1-2). The soil vapor that is extracted from onsite intermediate and deep soil vapor extraction wells (SVEWs) is treated in the Treatment Building to meet the monitoring requirements and emission discharge limitations contained in the New York State Department of Environmental Conservation (NYSDEC) Division of Air Resources (DAR) Permit Equivalent accepted by NYSDEC on 6 October 2011. A subsequent authorization was received from DAR to connect the Site 4 Soil Vapor Extraction (SVE) system to the Site 1 SVECS without modifications to the existing discharge limitations. The Air Permit Equivalent and subsequent related documentation and authorizations are included in Appendix A.

1.1 Purpose

This O&M Plan was written to provide the methods and procedures required to maintain and operate the Site 1 SVECS. This Plan includes information pertaining to the operation and maintenance of the SVECS, site security, regulatory requirements for plant operation, management of plant records, qualifications of plant personnel, sampling and analysis requirements, health and safety procedures, and waste handling procedures.

This O&M Plan is supplemented by equipment manufacturer O&M manuals for each equipment component. Additional equipment manufacturer O&M information may be added as future modifications may warrant. This Plan is considered a living document that will require periodic updating to reflect current conditions.

1.2 Organization of the O&M Plan

The following gives a brief overview of the remaining sections of this O&M Plan.

Section 2.0, Regulatory Compliance, outlines local, state and federal codes and regulations pertaining to the operation and maintenance of the SVECS.

The monitoring requirements and discharge limitations for emission of treated off-gas and other operational requirements are contained in this section.

Section 3.0, Records Management, describes record keeping forms and procedures for recording data from the operation and maintenance of the

NWIRP Bethpage, New York 2

SVECS. Samples of the required record keeping forms are contained in Appendix B, Report Forms.

Section 4.0, Performance Monitoring Program Description, outlines the schedule and procedures for sampling and analyzing the various influent, intermediate, and effluent process streams associated with the operation of the SVECS. This section along with the Sampling and Analysis Plan (SAP) provide the sampling and analytical procedures and associated quality control requirements and schedules to ensure that data quality objectives are achieved to demonstrate compliance with regulatory requirements.

Section 5.0, Health and Safety, contains a summary of general safety standards and procedures for operation and maintenance of the SVECS. This section along with the Operating Contractor Accident Prevention Plan (APP) and Site Safety and Health Plan (SSHP) must be consulted prior to the execution of any tasks performed by Operators and subcontractors to ensure they are performed in compliance with applicable safety procedures.

Section 6.0, Process Description and Operation, describes the functions and relationships of the equipment in the systems that comprise the SVECS.

Manual electronic controls and equipment interlocks are discussed in this section. Targeted set points and ranges of operational parameters for normal function of the soil vapor treatment process are provided in this section.

Section 7.0, Operations, contains procedures for the daily operation of process equipment. Start-up and shut-down procedures and equipment specifications for the major process equipment are provided in this section.

Section 8.0, System Troubleshooting, highlights procedures for diagnosing and solving problems with the major pieces of equipment in the SVECS.

Section 9.0, Equipment Maintenance, includes a matrix outlining the schedule and procedures for performing preventive maintenance on system equipment. This section also describes maintenance record keeping procedures and instructions for housekeeping and the general upkeep of the SVECS.

Section 10.0, Waste Transportation and Disposal, describes the requirements for onsite storage, marking, transportation, and disposal of all liquid and solid waste generated at the SVECS. This section includes the requirements for selecting and approving subcontractors to handle and dispose of the waste generated at the facility, as well as record keeping requirements for waste generation and disposal.

1.3 Using the O&M Plan

The purpose of this O&M Plan is to facilitate the understanding of key operations and maintenance features of the SVECS. A cursory review of this Plan by a new Operator will not qualify him/her to operate and maintain the facility. A transition period with an experienced Operator following a comprehensive review of this O&M Plan are recommended when training a new Operator.

NWIRP Bethpage, New York 3

This O&M Plan should be updated periodically to remain current. The Plan should be revised when SVECS modifications are performed, replacement equipment that differs from the original is installed, and when revised techniques are devised for operating and maintaining the SVECS.

1.4 Site Location

NWIRP Bethpage is located in east central Nassau County, Long Island, New York, approximately 30 miles east of New York City (Figures 1-1 and 1-2). NWIRP Bethpage was formerly a Government Owned Contractor-Operated (GOCO) facility that was operated by Northrop Grumman Corporation (NG) until September 1998, and is currently inactive. The Navy’s final land holdings at the termination of operations consisted of a main parcel of approximately 105 acres and a separate parcel of approximately 4.5 acres located north of the main parcel. The 4.5-acre parcel was transferred to Nassau County in 2002, followed by 96 acres transferred to Nassau County in 2008. The Navy currently leases the remaining nine acres to Nassau County but has retained ownership for environmental investigation and remediation.

Upon successful remediation of the nine-acre parcel, ownership of the parcel also will be transferred to Nassau County. NWIRP Bethpage is bordered on the north, west, and south by property currently owned and managed by Steel Equities Management, and, on the east, by a residential neighborhood.

1.5 Site History

NWIRP Bethpage is currently listed by NYSDEC as an “inactive hazardous waste site” (#1- 30-003B), as is NG (#1-30-003A) and the Hooker/RUCO site (#1-30-004) located less than 1/2 mile west of NWIRP Bethpage.

NWIRP Bethpage was established in 1941. Since inception, the primary mission of the facility was the research, prototyping, testing, design engineering, fabrication, and primary assembly of military aircraft. The facilities at NWIRP Bethpage included four plants (Nos. 3, 5, and 20, used for assembly and prototype testing; and No. 10, which contained a group of quality control laboratories), two warehouse complexes, a salvage storage area, water recharge basins, an industrial wastewater treatment plant, and several smaller support buildings.

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 directly into either drainage sumps, dry wells, and/or on the ground surface, resulting in the disposal of a number of hazardous wastes, including VOCs, semi-volatile organic compounds (SVOCs), polychlorinated biphenyl compounds (PCBs), and the inorganic analytes, chromium and cadmium, at the site. Some of these contaminants have migrated from the points of disposal to surrounding areas, including the soils of the site and the groundwater beneath and downgradient of the NWIRP Bethpage property.

Remedial Investigations conducted in the early 1990s identified VOC-contaminated soils and shallow groundwater at Site 1 that were contributing to a regional groundwater plume [Halliburton NUS (HNUS) 1993]. To address this contamination, a Record of Decision (ROD) (Navy, 1995) for Operable Unit (OU)-1 was prepared that included in-situ treatment of VOCs in soil by air sparge (AS) and SVE, excavation and offsite disposal of soils

NWIRP Bethpage, New York 4 contaminated with PCBs, and placement of a permeable cover to address other residual contaminants including cadmium, chromium, and VOCs. Between 1996 and 2002, the AS/SVE system treated VOC-impacted soil and shallow groundwater and removed approximately 4,500 pounds of VOCs. In October 2002, the Navy reported that the objectives of the AS/SVE system had been met and recommended removal of the system. In December 2003, NYSDEC concurred with this recommendation and operation of the AS/SVE system was discontinued.

In the years following discontinuation of the AS/SVE system, the New York State Department of Health (NYSDOH) finalized guidance to address vapor intrusion that may occur thorough volatilization of contamination from groundwater, through the vadose zone and then potentially into indoor air. The 1995 ROD did not identify the vapor intrusion pathway as a potential concern. In January 2008, the Navy initiated an investigation along the eastern edge of Site 1, adjacent to the residential neighborhood. The results of this investigation identified several VOCs including tetrachloroethene (PCE) and trichloroethene (TCE) in soil vapor that exceeded NYSDOH subslab screening values (NYSDOH, 2006) for evaluating potential vapor intrusion.

In 2009, as a Time-Critical Removal Action (TCRA), the Navy installed air purification systems and subslab depressurization (SSD) systems in several residential homes. As a Non- Time-Critical Removal Action (NTCRA), the SVECS was constructed, consisting of 12 SVEWs along the eastern boundary of the Navy property, with extracted vapor collected in a Flow Monitoring Station (FMS) located in the southeastern corner of Site 1, with vapors subsequent transferred along a 10-inch conveyance pipe to the treatment facility at Building 03-35 (Figure 1-3). Contaminated vapors are treated by processing them through a VGAC unit having a carbon capacity of 5,000 pounds. The initial 12 SVEWs were installed as six pairs with one well at an intermediate depth [screened interval between 25 and 35 feet below ground surface (bgs)] and one well at depth (screened interval between 40 and 60 feet bgs) per pair. Nine offsite soil vapor pressure monitoring (SVPM) points, in groups of three wells each (shallow, intermediate, and deep), were installed in the residential area to the east of Site 1 to monitor the vacuum field established by the system. Shallow SVPMs were screened at depths of approximately 10 feet bgs, intermediate SVPMs at approximately 25 feet bgs, and deep SVPMs at approximately 50 feet bgs. SVECs operations were initiated in December 2009 following startup.

By November 2010, offsite indoor air concentrations were below the current air guideline values (NYSDOH, 2006). Based on subsequent testing, it was concluded that no further in-home action was necessary to mitigate vapor intrusion while the SVECS was in operation.

By 2012, the in-home systems had been removed.

In 2011, the Navy implemented a program [Tetra Tech, Inc. (Tetra Tech), 2011] to install five additional SVEWs (SVE-107D through SVE-111D) located along the existing conveyance pipe from FMS-1 to the treatment system in Building 03-35 (Figure 1-3). These extraction wells were designed to facilitate the removal of residual contaminated soil vapor at Site 1, the southern portion of Plant No. 3, and the northern portion of the South Warehouses that may result in future offsite migration of VOCs. Because of the relatively impermeable nature of the ground surface in these areas (buildings and pavement), in the long term, the capture zones of the proposed wells would also affect areas further north and south. These wells were installed (Tetra Tech, 2011), tied in directly to the main conveyance pipe leading to the

NWIRP Bethpage, New York 5

VGAC treatment unit at Building 03-35, and set to operate at a reduced targeted rate of approximately five (5) cubic feet per minute (cfm) from each well to conform with the existing system flow capacity / extraction rates developed for the initial 12 SVEWs. No flow equipment or sampling ports were installed for these five SVEWs. Flow rates for these five wells cannot be directly measured but can be estimated by taking the difference between the system flow rate and the sum of the flow rates for the 18 other SVEWs.

In 2013, as a part of the 2009 NTCRA, the Navy installed ten additional SVPMs in the residential neighborhood abutting the NWIRP Bethpage. One of these ten SVPMs was a replacement for one of the originals that had been damaged. Three additional sets of three wells each were installed to monitor a greater area of the residential neighborhood, resulting in a total of 18 offsite SVPMs.

Soil delineation efforts within Site 1 following the 1995 ROD identified a substantial increase in the estimated volume of PCB-contaminated soil. As a result, the non-VOC portions of the OU-1 ROD consisting of excavation and offsite disposal and covering of residual impacted soil were not implemented. The final remedy implementation for Site 1, designated as OU-4, was addressed by a supplemental ROD (Navy, 2018), consisting of:

Excavation and offsite disposal of PCB-impacted soils with concentrations greater than 500 milligrams per kilogram (mg/kg), Placement of a permeable cover over the remaining residual soils impacted by PCB concentrations less than 500 mg/kg, and

Continued operation of the existing SVECS with additional SVEWs to be installed to accelerate cleanup of residual VOC contamination within the source area at Site 1 and to support the control of potential offsite migration of VOC-impacted soil vapors and vapor intrusion in offsite residential areas.

Implementation of the contaminated soil portion of the remedy presented in the 2018 ROD was conducted by Aptim Federal Services, LLC (APTIM) during the period 2019 to 2022 (APTIM, 2022). Following excavation of the PCB-impacted soils and placement of the permeable cover, six deep SVECs were installed in the central area of Site 1 [AGVIQ, LLC (AGVIQ), 2021]. Transfer piping from each SVEW was routed to a new FMS (FMS-2) located at the southeastern limit of the excavation, approximately 50 ft to the northwest of the original Site 1 FMS (FMS-1). The supplemental FMS-2 was connected directly into the main conveyance pipe leading to the VGAC treatment unit at Building 03-35. In response to the greater flow required by the addition of these SVEWs, the two blowers at the treatment unit in Building 03-35 were upgraded to support the increased flow demand.

With the most recent updates to the SVECS, there are currently a total of 23 SVEWs, with 18 of these capable of flow monitoring and vapor sampling the respective FMS. The current SVECS is described in Section 1.8.

1.6 Site Characteristics

Soils at Site 1 consist mainly of unconsolidated sediments that overlie crystalline bedrock.

The unconsolidated sediments consist of four distinct geologic units that in descending order are the Upper Glacial Formation, the Magothy Formation, the Raritan Clay, and the Lloyd Formation. For the SVECS at Site 1, the subsurface materials affected by the vapor jmynatt Highlight

NWIRP Bethpage, New York 6 extraction process consist of the Upper Glacial Formation, which is approximately 30 to 45 feet thick, and consists chiefly of coarse sands and gravels. A clay unit is present near the groundwater table 50 feet 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 offsite VOCs in soil vapor.

Chlorinated solvents including TCE, 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 NYSDOH for subslab soil vapor concentrations, as updated in 2017. Of these chemicals, TCE is the primary VOC of concern. Addressing TCE contamination in accordance with NYSDOH guidance should address the other VOCs associated with the site (NYSDOH, 2017).

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. Based on limited data, these constituents are not expected to be present along the fence line at environmentally significant concentrations.

1.7 Project Overview and Objectives

The original 1995 ROD (Navy, 1995) states that the remedial objective for this project is to operate the SVECS to prevent further off-site migration of VOC contaminated soil vapor and to the extent practical, capture contaminated soil vapor internal to Site 1 with a TCE concentration greater than 250 μg/m3. A secondary objective of this project is to address soil vapor with a TCE concentration greater than 5 μg/m3 [Design Analysis Report for Soil Vapor Extraction Containment System, Tetra Tech NUS (TtNUS), April 2009]. In response to the 1995 ROD (Navy, 1995), the SVECS was designed as an interim action intended to primarily address migration of VOCs in contaminated soil vapors. In accordance with the supplemental OU-4 ROD (Navy, 2018), six additional deep SVEWs in the central area of Site 1 were installed to facilitate source control, which would also assist with the mitigation of potential offsite migration of impacted vapors. The SVECS 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.

1.8 General Description of Site 1 SVECS

The SVECS (Figure 1-3) consists of soil vapor extraction, soil vapor monitoring, and soil vapor treatment. Six SVEW clusters (each with one intermediate and one deep well) are located along the eastern boundary of Site 1, six individual deep SVEWs are located in the central area of Site 1, and five SVEWs are located along the main conveyance pipe to the Treatment Building (Building 03-35). All SVEWs are utilized for the extraction of soil vapors during system operation.

With the exception of the five SVEWs located along the main conveyance pipe, each SVEW has been piped below the ground to one of two FMS, where flow, vacuum, and vapor quality can be monitored. The original FMS-1 (12 SVEWs) consists of an 8 feet wide by 8 feet tall by 20 feet long Conex box located in the southeast corner of the Site. The supplemental FMS-2 (six SVEWs) consists of an 8 feet wide by 8 feet tall by 20 feet long Conex box located

NWIRP Bethpage, New York 7 approximately 50 feet to the northwest of the original FMS-1. All the SVEW lines collect into a single manifold within each FMS and from these locations are tied into a single 10-inch diameter underground conveyance pipe routed to the Treatment Building. The Treatment Building is a previously unoccupied building 31 feet wide by 60 feet long. The north side of the building is equipped with a 10 feet wide by 10 feet high overhead door. The Treatment Building also has three 3 feet by 7 feet doors on the north, east and west sides. The soil vapor treatment consists of moisture separation and off-gas treatment using VGAC to remove the chlorinated VOCs. All of the treatment operations within Building 03-35 are conducted in a 20 feet by 31 feet area on the eastern side of the building.

Eighteen SVPMs configured in nine clusters of three SVPMs each are located east and southeast of the SVEWs along 9th and 10th Streets and along Maple Avenue and Sycamore Avenue (Figure 1-3) and are used to monitor the effectiveness of the system in maintaining a vacuum field and capturing and containing the contaminated soil vapors in the residential area east of Site 1.

1.8.1 Design Flow and Influent Concentration

The SVECS was initially designed to provide for a nominal flow of 600 cfm and a maximum flow of 1,000 cfm of soil vapor extracted from the original six intermediate and six deep SVEWs. Flow rates for the initial 12 SVEWs were set to result in a total system influent rate of 315 to 400 cfm in the winter months and 450 to 500 cfm in the summer months, allowing for extra system capacity of approximately 130 to 200 cfm of flow. This additional system capacity was used to support the 2011 expansion of the SVEC (Tetra Tech, 2011) that incorporated five deep SVEWs (SVE-107D, SVE-108D, SVE-109D, SVE-110D, and SVE-111D) installed along the main conveyance pipe to the Treatment Building. These five SVEWs were set to operate with a flow rate of approximately 5 cfm each to fit within the available system capacity.

The more recent system expansion in 2022 (AGVIQ, 2021) added six deep SVEWs (SVE-112D, SVE-113D, SVE-114D, SVE-115D, SVE-116D, and SVE-117D) in the central area of Site 1 in response to the supplemental 2018 OU-4 ROD (Navy, 2018), to provide source control within the central area of Site 1. An upgrade was completed to both blowers in the Treatment Building, installing both larger fans and larger motors [a horsepower increase from 7.5 horsepower (hp) to 10 hp] to compensate for the additional system influent flow from the expansion wells.

Following the SVECS expansion, flow rates from individual SVEWs was balanced to provide a total flow of approximately 300 cfm at the 12 fence line SVEWs, a total of approximately 300 cfm for the central area SVEWs, along with the balance of flow estimated at 25 cfm coming from the five SVEWs along the main conveyance pipe. Table 1-1 lists the flow and vacuum readings for each 18 SVEWs following adjustment in September 2023.

At system initiation in 2010, the mean concentration of VOCs in the influent soil vapor consisted of 41,128 µg/m3 of TCE, 381 µg/m3 of PCE, and 20,634 µg/m3 of 1,1,1- TCA, with maximum concentrations of 180,000 µg/m3 of TCE, 1,200 µg/m3 of PCE, and 90,000 µg/m3 of 1,1,1- TCA. With continued extraction of VOCs during the years 2010 to present (July 2023), influent concentrations have decreased by two orders magnitude: TCE decreased to 435 µg/m3, PCE to 370 µg/m3, and 1,1,1-TCA to 130 µg/m3.

jmynatt Highlight

NWIRP Bethpage, New York 8

Table 1-1 SVEW Flow and Vacuum Settings September 2023

SVEW Flow Rate (cfm) Vacuum (i.w.)

Flow Monitoring Station 1

SVE-101I 25.5 2.3

SVE-101D 30.5 7.0

SVE-102I 34 2.2

SVE-102D 42.5 6.5

SVE-103I 36 5.5

SVE-103D 18 7.25

SVE-104I 17.5 3.2

SVE-104D 21 7.5

SVE-105I 19.5 2.25

SVE-105D 25 6.5

SVE-106I 15.75 2.5

SVE-106D 20 7.0

Flow Monitoring Station 2

SVE-112 43.5 7.1

SVE-113 54 8.45

SVE-114 71 7.5

SVE-115 62 7.0

SVE-116 61 7.0

SVE-117 75 7.25

i.w. - inches of water.

1.8.2 Soil Vapor Extraction

SVEWs are used to assess the performance of the SVECS and were installed in three separate events, with 12 SVEWs installed in 2009 (TtEC, 2009), five SVEWs installed in 2011 (Tetra Tech, 2011) and 6 SVEWs installed in 2022 (AGVIQ, 2021). Each group of SVEWs is discussed in separate sections below.

Eastern Boundary SVEW Clusters: The design and installation of these SVEWs are described in Appendix C-1, Drawing C-5. The six clusters each consist of one intermediate well and one deep well. All of these SVEWs are constructed with two-inch outside diameter Schedule 40 polyvinyl chloride (PVC) risers and 0.020-inch high-capacity machine slotted screens.

Intermediate Wells SVE-101I, SVE-102I, SVE-103I, SVE- 104I, SVE-105I, and SVE-106I (Figure 1-3) have screened intervals between 25 and 35 feet bgs (Table 1-2). Deep Wells SVE-

NWIRP Bethpage, New York 9

101D, SVE-102D, SVE-103D, SVE-104D, SVE-105D, and SVE-106D (Figure 1-3) have screened intervals between 40 and 60 feet bgs (Table 1-2). Each Eastern Boundary SVEW operates at a design flow rate of approximately 25 cfm for a total flow rate of approximately 300 cfm on the effluent side of FMS-1. SVE rates for each of these SVEWs are controlled by manual valves located at FMS-1. A portable velocity meter is used to measure air flow while adjusting the control valves.

Table 1-2 SVEW Completion Details

Location Location ID Type Depth

Onsite Fenceline SVE-101I SVEW 25-35

Onsite Fenceline SVE-101D SVEW 40-60

Onsite Fenceline SVE-102I SVEW 25-35

Onsite Fenceline SVE-102D SVEW 40-60

Onsite Fenceline SVE-103I SVEW 25-35

Onsite Fenceline SVE-103D SVEW 40-60

Onsite Fenceline SVE-104I SVEW 25-35

Onsite Fenceline SVE-104D SVEW 40-60

Onsite Fenceline SVE-105I SVEW 25-35

Onsite Fenceline SVE-105D SVEW 40-60

Onsite Fenceline SVE-106I SVEW 25-35

Onsite Fenceline SVE-106D SVEW 40-60

Onsite Conveyance Pipe SVE-107D SVEW 33-53

Onsite Conveyance Pipe SVE-108D SVEW 33-53

Onsite Conveyance Pipe SVE-109D SVEW 34-54

Onsite Conveyance Pipe SVE-110D SVEW 33-53

Onsite Conveyance Pipe SVE-111D SVEW 38-58

Onsite Central Area SVE-112D SVEW 37-57

Onsite Central Area SVE-113D SVEW 40-60

Onsite Central Area SVE-114D SVEW 40-60

Onsite Central Area SVE-115D SVEW 40-60

Onsite Central Area SVE-116D SVEW 40-60

Onsite Central Area SVE-117D SVEW 40-60

ID – Identification

Depth in feet bgs.

Trap and Cleanout System: The potential for moisture accumulation in the main conveyance pipe from FMS-1/FMS-2 to the Treatment Building is addressed by the presence of five trap and cleanout points (Numbers 1 through 5) along the conveyance pipe (Appendix C-2, NWIRP Bethpage, New York 10

Figures 4 and 5). The trap-inverts range in depth from approximately 4.5 to 7 feet bgs (Table 1-3).

Table 1-3 Trap and Cleanout Invert Depths

Trap and Cleanout Trap-Invert Depth

(feet bgs)

1 6

2 5.4

3 6.9

4 6.3

5 4.6

Moisture collected in this system is suspected to be derived from precipitation infiltration captured by the SVEWs and/or condensate from the moisture in the soil vapors. Because the moisture is observed primarily in the winter months (January to March), condensation is likely to be the primary source of the moisture. Moisture is typically evidenced by fluctuation or bouncing of vacuum measurements at a specific SVEW and can also be heard in the lines. The Operator is required to periodically check for the accumulation of moisture, and when detected, extract, and dispose of it, as appropriate.

Southern SVEWs (along main conveyance pipe): As shown in Table 1-2, depths for this set of SVEWs range from 53 to 58 feet bgs. Each SVEW is constructed with two-inch outside diameter Schedule 40 PVC risers with 10-feet of 0.020-inch high-capacity machine slotted screens and is tied into existing two-inch piping between the existing trap and cleanout piping and the 10-inch main conveyance pipe to the Treatment Building (Appendix C-2, Figure 4).

A six-inch diameter valve pit is installed at each SVEW (Appendix C-2, Figure 7) to allow access to a two-inch brass gate valve to control vapor flow. The current design for these SVEWs indicates a target flow at each well at approximately 5 cfm.

Central Area Individual SVEWs: Six deep SVEWs, SVE-112D, SVE-113D, SVE-114D, SVE-115D, SVE-116D and SVE-117D, were installed in the central area of Site 1 (Figure 1-

3) to provide additional source control as part of the overall Site 1/OU-4 remediation program in accordance with the OU-4 ROD (Navy, 2018). Well design information is presented in Appendix C-3, Drawing C-2 and completion details are provided in Table 1-2.

Two passive injection wells (PIW-001 and PIW-002) were installed in the eastern area of Site 1 (Appendix C-3, Drawing C-1) to induce atmospheric make-up air into the subsurface in response to the extraction of soil vapor by the SVEWs. This was done to enhance the air flow through the subsurface to promote the volatilization and extraction of VOCs from the subsurface. Each of these passive injection wells were completed at a depth of 60 feet bgs, with screened intervals from 30 to 60 feet bgs.

Influent from 18 of the SVEWs are collected at one of two FMS and transported approximately 1,400 linear feet to the Treatment Building via a 10-inch conveyance pipe.

The five southern SVEWs are connected directly to the conveyance pipe; no FMS is associated with these SVEWs. Within both FMS-1 and FMS-2, the discharges from the individual SVEWs have been equipped with a 2-inch flow control butterfly valve, a vacuum

NWIRP Bethpage, New York 11 gauge, and a sampling port. The sampling port can be utilized to measure the flow rate from an individual well using a portable velocity meter and to collect vapor quality samples. The manifolds within FMS-1 and FMS-2 are a 12-inch diameter Schedule 40 PVC pipe equipped with a vacuum gauge and an air bleed port to allow flushing of any condensate that may accumulate in the conveyance line to the Treatment Building.

The Operator should plan to rebalance the flow from each SVEW within the system at least once per year to verify that vapor containment along the eastern boundary and vapor recovery/treatment within Site 1 is progressing in accordance with project objectives.

Review of quarterly SVEW vapor sample data and annual SVPM vapor sample data may indicate the need to rebalance the system more frequently.

Extraction well flow rates operation may be further optimized to focus efforts on areas or elevated VOCs concentration. This may include rotating vacuum to select SVEWs such that higher vacuums can be applied at fewer locations enhancing removal of VOCs while ensuring containment remains along the fence line at locations which continue to exhibit elevated VOCs concentrations.

1.8.3 Soil Vapor Pressure Monitoring

Eighteen SVPMs have been installed in the residential area to the east of Site 1 to monitor the effectiveness of the system maintaining the vacuum field and capturing and containing the contaminated soil vapors in the area east of Site 1. The SVPMs are constructed of one-inch outside diameter Schedule 40 PVC risers and 0.020-inch high-capacity machine slotted screens installed at various depths. The depths of individual SVPMs are shown in Table 1-4. Each SVPM is equipped with a sealed cap, valve, and threaded sample port.

1.8.4 Soil Vapor Treatment

The soil vapor treatment system (Appendix C-3, Drawing P-2) is housed within the Treatment Building and consists of a moisture separator, two soil vapor extraction blowers, and a VGAC unit for removal of chlorinated VOCs from the off-gas. Soil vapor that enters the Treatment Building will first pass through the moisture separator tank (M-1) where any condensate will be separated and removed by a portable pump into 55-gallon drums on a periodic basis, tested, and disposed of off-site. The vapor from M-1 is drawn through an air filter (F-2) by one of two soil vapor extraction blowers (B-1A or B-1B) and then treated in the VGAC unit (VGAC-1). If necessary, there is also a provision for adding make-up air via air filter-silencer (F-1) to the vapor stream after it leaves tank M-1, prior to air filter F-2. Under normal operation, only one blower will operate with the second blower in standby. The Operator will rotate use of the blowers monthly to maximize the service life of each blower. The treated vapor will be discharged from VGAC-1 via an exhaust stack. The SVECS treatment system has a local control panel (LCP) for local operation. The LCP consists of mechanical interlocks and relays; no Programmable Logic Controllers (PLCs) are used.

The moisture separator tank, M-1 is a 1,000-gallon, 5-foot diameter by 4-foot high sideshell carbon steel tank with a corrosion resistant coating and a visual sight glass supplied by Tetrasolv Filtration (Appendix D-1). It has an integral vacuum relief valve and is equipped with a high condensate level sensor/switch.

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Table 1-4

SVPM Construction Details

Location Location ID Type Depth

11th Street

BPS1-SVPM2001S SVPM 8-10

BPS1-SVPM2001I SVPM 23-25

BPS1-SVPM2001D SVPM 43-45

11th Street

BPS1-SVPM2002S SVPM 8-10

BPS1-SVPM2002I SVPM 23-25

BPS1-SVPM2002D SVPM 42-44

11th Street

BPS1-SVPM2003S SVPM 8-10

BPS1-SVPM2003I SVPM 23-25

BPS1-SVPM2003D SVPM 43-45

Sycamore Avenue

BPS1-SVPM2004S SVPM 8-10

BPS1-SVPM2004I SVPM 23.5-25.5

BPS1-SVPM2004D SVPM 40-42

10th Street

BPS1-SVPM2006S SVPM 8-10

BPS1-SVPM2006I SVPM 23-25

BPS1-SVPM2006D SVPM 43-45

10th Street

BPS1-SVPM2007S SVPM 8-10

BPS1-SVPM2007IR SVPM 23-25

BPS1-SVPM2007D SVPM 40-42

ID - Identification

The air filter-silencer F-1 is a Universal Silencer Model CS-4 flanged unit rated for 500 cfm and has a built-in silencing section equipped with a removable top plate for easy access to the filter element (Appendix D-2). Inline air filter F-2 is a Universal Silencer Model ILFV-8 rated for 2,200 cfm equipped with a removable top plate for easy access to the filter element (Appendix D-2). Filter F-2 is also equipped with a differential pressure gauge on the inlet and outlet of the filter (DPI-101) which provides a convenient and accurate means of monitoring the pressure drop across the filter as more and more dirt accumulates on the filter element.

Blowers B-1A and B-1B are National Turbine Corporation Millennium Series Model M24-319R equipped with a Baldor three-phase induction motor – squirrel cage rotor that is rated for 10 HP, 3,600 revolutions per minute (rpm), and 460 volts (Appendix D-3). These blowers are designed for a nominal flow rate of 700 cfm each at 34 inches of water (i.w.). Each blower has manual start and stop buttons and reset switches for interlock shutdown scenarios. The treatment system will have the following interlock shutdown scenarios:

Low vacuum switch in piping before the soil vapor extraction blowers;

NWIRP Bethpage, New York 13

High level switch for condensate collected in the Moisture Separator (M-1);

High temperature switch in the piping after the soil vapor extraction blowers; and

High pressure switch in the piping after the soil vapor extraction blowers.

In shutdown scenarios, the LCP will signal the existing Auto-Dialer in an adjacent building.

The VGAC unit is a 6 feet wide by 8 feet long by 6.67 feet high carbon steel rectangular tank, Tetrasolv Filtration Model VF-5000, containing 5,000 pounds of VGAC (Appendix D-4). It is designed to operate at a nominal flow rate of 600 cfm and a maximum flow rate of 1,000 cfm.

1.8.5 Instrumentation Description

The components of the soil vapor treatment system are manually controlled and monitored by appropriate instrumentation. Each of the main components – the moisture separator, the air filters, and the VGAC unit are equipped with local vacuum/pressure gauges and/or differential pressure indicators. Additional instrumentation includes a high-level switch for the moisture separator, and a low vacuum switch, high temperature switch and a high-pressure switch for the soil vapor extraction blowers that will shut down the system and activate the Auto-Dialer.

The off-gas from the SVECS is monitored for chlorinated VOCs as identified in the NYSDEC/DAR permit equivalent effluent limitations and monitoring requirements. The samples will be analyzed by an analytical laboratory for PCE, TCE, 1,1,1-TCA, 1,1-dichloroethane (DCA), 1,2-DCA, 1,1-dichloroethene (DCE), cis-1,2-DCE, trans-1,2-DCE, and vinyl chloride (VC) in accordance with current DAR approval.

1.9 Site Security

The SVECS Treatment Building and the equipment inside are surrounded by the NWIRP property fence with locked gates to protect it from burglary and vandalism and to protect the public and property from the equipment and operations. The SVECS is also equipped with a Gamewell FCI GF505 commercial fire alarm panel with a 4G-LTE dedicated radio and an Ademco 4G-LTE Cellular Communicator with 6160 Alpha Numeric Keypad security system. In the event of a break-in, this alarm will activate the Auto Dialer and notify the security agency.

The security agency will notify the Nassau County Police Department (NCPD) and the on-call Operator. After the Operator has inspected the SVECS property and determined the extent of the damage (if any), he will notify NCPD and the Project Manager for the Operating Contractor. In the event of a fire at the SVECS, the local emergency services (including fire and police departments) will be automatically notified. The Operator will quickly initiate any necessary repairs to the SVECS and proceed to clean up any graffiti on the SVECS property caused by vandalism. All of these activities will be performed soon after seeking the necessary authorization from the Project Manager for the Operating Contractor. Emergency telephone numbers in effect for calendar years 2023 and 2024 are listed in Table 1-5.

NWIRP Bethpage, New York 14

1.10 Staffing and Training

1.10.1 Staffing

The SVECS has been designed to be operated on a long-term basis as an autonomous operation equipped with an Auto Dialer. It is anticipated that the Operator will monitor the SVECS operation at least once or twice a week. In the event of a plant shutdown, the Auto Dialer will dial an on-call Operator. The SVECS will be staffed by experienced operators. If necessary, technical support will be provided by specialty subcontractors for operational or equipment problems of a technical nature and additional operations support. A contracted maintenance crew or authorized equipment service representative will perform repairs of mechanical/electrical equipment which are beyond the Operator’s capabilities.

Table 1-5 Site 1 Soil Vapor Extraction Containment System Emergency Telephone Numbers

Operational Years 2023-2024

Contact Firm or Agency Telephone Number

Police Nassau County Police Department

516-573-6800

Fire Bethpage Fire Department

516-931-2660

Hospital St. Joseph Hospital 4295 Hempstead Turnpike Bethpage, New York 11714

516-579-6000

Ambulance Bethpage Ambulance

516-931-0666

Robert Gregory, PM KGS 1st Contact

KGS

Office – 610-400-0636

Cell – 610-659-9295

Randall Hoffmaster, Primary Operator KGS 2nd Contact

KGS Cell - 516-413-5099

Navy RPM - Scott Sokolowski NAVY MIDLANT 757-444-0781

Chris Shukis, Mechanical / Electrical Supervisory Engineer

Navy PWD FEAD Office - 860-694-4556

Cell - 860-235-2041

NWIRP Bethpage Facilities Manager Vin Varricchio

Tetra Tech, Inc. Cell - 516-680-1201

Poison Control Center 800-222-1222

National Response Center 800-424-8802

NWIRP Bethpage, New York 15

1.10.2 Training

The Operator will be required to participate in a field training program given by the current Operating Contractor and/or selected equipment manufacturer representatives. The training will address equipment operation, maintenance, equipment, safety requirements and troubleshooting and other subjects required to properly operate the SVECS including regular communication with the Site management.

1.11 Supporting Documentation

The following supporting documents and manual have been used as technical references for this O&M Manual. A copy of these documents can be found in the Treatment Building.

1. Final Work Plan for the Design, Installation and Operation of Soil Vapor Extraction System, Site 1, Former Drum Marshalling Area at NWIRP Bethpage, NY, October 15, 2009, by TtEC.

2. Final Construction Quality Control Plan for the Design, Installation and Operation of Soil Vapor Extraction System, Site 1, Former Drum Marshalling Area at NWIRP Bethpage, NY, September 24, 2009, by TtEC.

3. Final Operation & Maintenance Plan for Soil Vapor Extraction Containment System, Site 1 – Former Drum Marshalling Area at Naval Weapons Industrial Reserve Plant, Bethpage, Bethpage, New York, Revision 0, November 2010, by TtEC.

4. 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 2011, by Tetra Tech.

5. 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, February 2012, by Tetra Tech.

6. Guidance for Evaluating Soil Vapor Intrusion in the State of New York, Updates to Soil Vapor/Indoor Air Decision Matrices, May 2017, by New York State Department of Health.

7. Final Accident Prevention Plan, Long-Term Environmental Operations, Maintenance, and Monitoring, Naval Weapons Industrial Reserve Plant, Site 1, Bethpage, New York August 2017, by KGS.

8. Draft Post-Construction Operation and Maintenance Plan, Site 1 – Former Drum Marshalling Area, Naval Weapons Industrial Reserve Plant Bethpage, Bethpage, New York, August 2020, by APTIM.

9. Final Operation & Maintenance Plan for Soil Vapor Extraction Containment System, Site 1 – Former Drum Marshalling Area at Naval Weapons Industrial Reserve Plant, Bethpage, Bethpage, New York, Revision 1, October 2020, by Tetra Tech.

10. Final Remedial Action Work Plan,…