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Study Area FeasibilityStudy

Operable Unit 3 (Former Grumman Settling Ponds),

Bethpage, New York

NYSDEC Site # 1-30-003A

November 10, 2010, Revised April 7, 2011

Study Area Feasibility StudyOperable Unit 3 (Former Grumman Settling Ponds), Bethpage, New YorkNYSDEC Site # 1-30-003ADavid Stern

Senior Hydrogeologist

Kenneth Zegel, P.E.Senior Engineer

Carlo San GiovanniProject Manager

Michael F. WolfertProject Director

Prepared for:

Northrop Grumman Systems Corporation

Prepared by:

ARCADIS of New York, Inc.Two Huntington QuadrangleSuite 1S10MelvilleNew York 11747Tel 631.249.7600Fax 631.249.7610

Our Ref.:

NY001496.0811.FS0D4

Date:

November 10, 2010,Revised: April 7, 2011

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Table of Contents

Certification viii

Acronyms and Abbreviations ix

EXECUTIVE SUMMARY xii

1. Purpose 1

2. Study Area Description 1

2.1 Study Area 1

2.2 Groundwater Use 2

3. Summary of RI and Current Remedial Operations 3

3.1 Previous/Other Investigations 3

3.2 Study Area Geology 3

3.3 Study Area Hydrogeology 4

3.4 Nature and Extent of Groundwater Contamination in Study Area 4

3.5 Study Area Conceptual Site Model 5

3.6 Impacted Groundwater 5

3.7 Current Remedial Operations 6

4. Remedial Goals and Remedial Action Objectives 7

4.1 Standards, Criteria, and Guidance 7

4.2 Remedial Goals 8

4.3 Remedial Action Objectives 8

5. Identification and Screening of Remedial Technologies 9

6. Development and Analysis of Remedial Alternatives 9

6.1 Modeling 9

6.2 Description and Analysis of Alternatives 11

6.3 Preliminary Assessment of Remedial Process Closure Requirements 13

7. Recommended Remedy for Study Area 13

7.1 Summary of Recommended Remedy for Study Area 13

7.2 Sustainable Practices for the Recommended Alternative 15

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8. Summary of Comprehensive Recommended Remedy 16

9. References 20

Tables

Table 4-1 Potential Chemical-, Action-, and Location-Specific Standards, Criteria, and Guidelines (SCGs) Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3 (Former Grumman Settling Ponds) Bethpage, New York.

Table 5-1 Screening of Remedial Technologies: Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3 (Former Grumman Settling Ponds) Bethpage, New York.

Table 6-1 Evaluation Criteria for Remedial Alternatives, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3 (Former Grumman Settling Ponds) Bethpage, New York.

Table 6-2 Detailed Evaluation of Remedial Alternatives, Study Area FeasibilityStudy, Northrop Grumman Systems Corporation, Operable Unit 3 (Former Grumman Settling Ponds) Bethpage, New York.

Table 8-1 Summary of Comprehensive Recommended Remedy for Site and Study Areas, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3 (Former Grumman Settling Ponds) Bethpage, New York.

Figures

Figure 2-1 Study Area Showing Well and Vertical Profile Boring Locations and Line of Section A-A’, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3 (Former Grumman Settling Ponds) Bethpage, New York.

Figure 3-1 Study Area Conceptual Site Model, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3 (Former Grumman Settling Ponds) Bethpage, New York.

Figure 3-2 Concentrations of TVOCs in Regional Area Groundwater - PlanView, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3 (Former Grumman Settling Ponds) Bethpage, New York.

Figure 3-3 Concentrations of TVOCs in Groundwater (Cross Section A-A’),Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3 (Former Grumman Settling Ponds) Bethpage, New York.

Figure 6-1 Alternative 2 – Baseline/Continued Action Conceptual Site Layout, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3 (Former Grumman Settling Ponds) Bethpage, New York.

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Figure 6-2 Alternative 3 – Alternative 2 Plus One New Remedial WellConceptual Site Layout, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3 (Former Grumman Settling Ponds) Bethpage, New York.

Figure 6-3 Alternative 4 – Alternative 2 Plus Two New Remedial WellsConceptual Site Layout, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3 (Former Grumman Settling Ponds) Bethpage, New York.

Figure 6-4 Alternative 5 – Alternative 2 Plus One New Remedial Well and BWD Plant 4 as a Remediation System Conceptual Site Layout, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3 (Former Grumman Settling Ponds) Bethpage, New York.

Figure 6-5 Alternative 6 – Alternative 2 Plus Five New Remedial WellsConceptual Site Layout, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3 (Former GrummanSettling Ponds) Bethpage, New York.

Figure 6-6 Comparison of Model-Predicted TVOC Concentrations at BWD Well 4-1 by Remedial Alternative, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3, Bethpage, New York.

Figure 6-7 Comparison of Model-Predicted TVOC Concentrations at BWD Well 4-2 by Remedial Alternative, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3, Bethpage, New York.

Figure 6-8 Comparison of Model Predicted TVOC Concentrations at BWD Well5-1 by Remedial Alternative, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3, Bethpage, New York.

Appendices

A Groundwater Model Results

1. Introduction

2. Modeling Approach

2.1 Model Updates

2.1.1 Pumping and Recharge Rates

2.1.2 Contaminant Mass Distribution

2.1.3 Dual Domain Mass Transport

2.2 Particle Tracking Analysis

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2.2.1 Potentially Impacted Wells

2.3 Solute Transport

3. Simulation of Remedial Alternatives

4. Modeling Results

4.1 Alternative 2 – Baseline/Continued Action

4.2 Alternative 3 – Alternative 2, Plus One New Remedial Well

4.3 Alternative 4 – Alternative 2, Plus Two New Remedial Wells

4.4 Alternative 5 – Alternative 2, Plus Operate BWD Plant 4 as Remediation System, plus One New Remedial Well (RW-20)

4.5 Alternative 6 – Alternative 2, Plus Five New Remedial Wells

5. References

Tables

Table A-1 Comparison of Remedial Well Pumpage/Recharge by Alternative Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3 (Former Grumman Settling Ponds), Bethpage, New York.

Table A-2 Summary of Model-Predicted TVOC Mass Removed from Groundwater at the End of the 30 Year Period of Operation, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3 (Former Grumman Settling Ponds), Bethpage, New York.

Table A-3 Proposed Remedial Well Details, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3 (Former Grumman Settling Ponds), Bethpage, New York.

Figures

Figure A-1 Groundwater Model Domain, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3 (Former Grumman Settling Ponds), Bethpage, New York.

Figure A-2 Model Layers, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3 (FormerGrumman Settling Ponds), Bethpage, New York.

Figure A3 Current Extent of Regional TVOC Plume and Area of Interest, Study Area Feasiblity Study, Northrop Grumman Systems Corporation, Operable Unit 3 (Former Grumman Settling Ponds), Bethpage, New York.

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Figure A-4 Particle Tracking, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3 (FormerGrumman Settling Ponds), Bethpage, New York.

Figure A-5 Maximum Extent of TVOCs in Study Area Groundwater, Initial Conditions, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3 (Former Grumman Settling Ponds), Bethpage, New York.

Figure A-6 Alternative 2- Baseline/Continued Action Maximum Extent of TVOCs in Study Area Groundwater After 30 Years, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3 (Former Grumman Settling Ponds), Bethpage, New York.

Figure A-7 Alternative 3- Maximum Extent of TVOCs in Study Area Groundwater After 30 Years, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3 (Former Grumman Settling Ponds), Bethpage, New York.




Figure A-11 Model Predicted TVOC Concentrations in Existing Northrop Grumman Remedial Well under Alternative 2, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3, Bethpage, New York.

Figure A-12 Model Predicted TVOC Concentrations in Existing and Proposed Northrop Grumman Remedial Wells under Alternative 3, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3, Bethpage, New York.

Figure A-13 Model Predicted TVOC Concentrations in Existing and Proposed Northrop Grumman Remedial Wells under Alternative 4 Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3, Bethpage, New York.

Figure A-14 Model Predicted TVOC Concentrations in Existing and Proposed Northrop Grumman Remedial Wells under

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Alternative 5 Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3, Bethpage, New York.

Figure A-15 Model Predicted TVOC Concentrations in Existing and Proposed Northrop Grumman Remedial Wells under Alternative 6, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3, Bethpage, New York.

Figure A-16 Comparison of Model-Predicted TVOC Concentrations at BWD Well 4-1 by Remedial Alternative, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3, Bethpage, New York.

Figure A-17 Comparison of Model-Predicted TVOC Concentrations at BWD Well 4-2 by Remedial Alternative, Study Area FeasibilityStudy, Northrop Grumman Systems Corporation, Operable Unit 3, Bethpage, New York.

Figure A-18 Comparison of Model Predicted TVOC Concentrations at BWD Well 5-1 by Remedial Alternative, Study Area Feasibility Study, Northrop Grumman Systems Corporation, OperableUnit 3, Bethpage, New York.

Figure A-19 Alternative 2- Baseline/Continued Action Conceptual Site Layout, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3 (Former Grumman Settling Ponds), Bethpage, New York.

Figure A-20 Alternative 3- Alternative 2 Plus One New Remedial Well Conceptual Site Layout, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3 (Former Grumman Settling Ponds), Bethpage, New York.

Figure A-21 Alternative 4- Alternative 2 Plus Two New Remedial Wells Conceptual Site Layout, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3 (Former Grumman Settling Ponds), Bethpage, New York.

Figure A-22 Alternative 5- Alternative 2 Plus One New Remedial Well and BWD Plant 4 as a Remedial System Conceptual Site Layout, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3 (Former Grumman Settling Ponds), Bethpage, New York.

Figure A-23 Alternative 6- Alternative 2 Plus Five New Remedial WellsConceptual Site Layout, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3 (Former Grumman Settling Ponds), Bethpage, New York.

B Remedial Alternatives Detailed Cost Estimates

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Table B-1 Summary of Systems Operation Periods, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3 (Former Grumman Settling Ponds), Bethpage, New York.

Table B-2 Detailed Costs of Remedial Alternatives: Study Area Groundwater Alternative 3, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3 (Former Grumman Settling Ponds), Bethpage, New York.

Table B-3 Detailed Costs of Remedial Alternatives: Study Area Groundwater Alternative 3, Present Worth Calculations, Study Area Feasibility Study, Northrop Grumman Systems Corporation, Operable Unit 3 (Former Grumman Settling Ponds), Bethpage, New York.







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Certification

I, Kenneth Zegel, certify that I am currently a New York State registered professional engineer and that this Feasibility Study Report was prepared in accordance with all applicable statutes and regulations and in substantial conformance with the DER-10Technical Guidance for Site Investigation and Remediation (NYSDEC 2010).

Kenneth Zegel, P.E.Senior EngineerLicense # 081598-1

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Acronyms and Abbreviations

Access Road Former Grumman Plant 24 Access Road

ARCADIS ARCADIS of New York. Inc.

BethpageCommunity Park

The entire area that constitutes the present day Bethpage Community Park property

bls below land surface

BWD Bethpage Water District

COPCs Constituents of Potential Concern

CSM Conceptual site model

DCA Dichloroethane

DCE Dichloroethene

Freon 12 Dichlorodifluoromethane

FS Feasibility Study

ft feet

ft/day feet per day

GAC Granular activated carbon

gpm gallons per minute

Grumman Grumman Aerospace Corporation

HHRA Human Health Risk Assessment

IRM Interim Remedial Measure

ISTD In-situ thermal desorption

LEED Leadership in Energy and Environmental Design

Main Facility Northrop Grumman Main Facility, used to refer to current remedial systems associated with OU2 (Tower 96 and Tower 102)

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ft msl feet above mean sea level

Navy United States Navy

NorthropGrumman

Northrop Grumman Systems Corporation

NWIRP Naval Weapons Industrial Reserve Plant

NYCRR New York Code of Rules and Regulations

NYSDEC New York State Department of Environmental Conservation

NYSDOH New York State Department of Health

OCC Occidental Chemical Corporation

OM&M Operation, maintenance, and monitoring

OU2 Operable Unit 2

OU3 Operable Unit 3

Park Portion of the Bethpage Community Park not subject to soil removal during Town redevelopment activities

PCE Tetrachloroethene (a/k/a perchloroethene)

ppm parts per million

RAO Remedial action objective

RI Remedial Investigation

ROD Record of Decision

RSE Remedial System Evaluation

SCGs Standards, Criteria and Guidance Values

SCO Soil Cleanup Objective

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Site Area Portion of the Bethpage Community Park not subject to soil removal during Town of Oyster Bay (Town) redevelopment activities plus the Former Grumman Plant 24 Access Road. For the media soil gas and groundwater, the Site Area includes the entire Bethpage Community Park and the Former Grumman Plant 24 Access Road.

Study Area The area of Volatile Organic Compound (VOC)-impacted groundwater hydraulically downgradient (i.e., south and southeast) of and impacted by the Site Area, plus the peripheral area (i.e., an area of significantly lower to non-detect concentrations of VOCs) that was used to delineate the impacted groundwater

TCA Trichloroethane

TCE Trichloroethene

Town Town of Oyster Bay

TVOCs Total volatile organic compounds

USGS United States Geological Survey

µg/L micrograms per liter

USEPA United States Environmental Protection Agency

VC Vinyl chloride

VOCs Volatile organic compounds

VPB Vertical profile boring

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EXECUTIVE SUMMARY

This Study Area Feasibility Study (FS) was prepared by the Northrop Grumman Systems Corporation (Northrop Grumman) to identify and screen remedialtechnologies and evaluate remedial alternatives for constituents in groundwater in theStudy Area, located in Bethpage, New York. This FS also presents a summary of the Comprehensive Remedy for OU3, which includes both the Site Area FS (ARCADIS of New York, Inc. 2011) recommended remedy and the Study Area recommended remedy.

The term “Study Area” hereinafter refers to the area of volatile organic compound (VOC)-impacted groundwater hydraulically downgradient (i.e., south and southeast) of and impacted by the Site Area, plus the peripheral area (i.e., an area of significantly lower to non-detect concentrations of VOCs) that was used to delineate the impacted groundwater. The term “Site Area” hereinafter refers to the portion of the Bethpage Community Park not subject to soil removal during Town of Oyster Bay (Town)redevelopment activities plus the Former Grumman Plant 24 Access Road.

Investigations conducted by Northrop Grumman within the Study Area and previous investigations conducted by others identified a regional area of VOC-impactedgroundwater hydraulically downgradient of the Site Area, and the adjacent formerGrumman Facility, the Naval Weapons Industrial Reserve Plant (NWIRP), and the Occidental Chemical Corporation (OCC) site, located west of the Site Area. The constituents of potential concern (COPCs) identified in the Study Area groundwater are VOCs.

This Study Area FS was developed consistent with New York State Department of Environmental Conservation (NYSDEC) requirements. Potential remedial technologies were screened using applicable Standards, Criteria, and Guidelines (SCGs). Remedial technologies that were retained after screening were assembled into remedial alternatives that were evaluated against the remedy selection criteria in Title 6 of the New York Code of Rules and Regulations (NYCRR), Part 375-1.8(f).

Study Area Recommended Remedy

Based on the evaluations conducted, the Study Area Recommended Remedy is presented in this FS and is summarized below:

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Baseline Remedial Elements

• Remediate Site Area VOC source areas (i.e., total VOCs (TVOCs) greater than 10 parts per million (ppm) in soil and groundwater) using in-situ thermal desorption (ISTD) to reduce TVOC concentrations to 1 ppm or less.

• Continue operation, maintenance, and monitoring (OM&M) of the existing groundwater interim remedial measure (IRM) (four wells; total 210 gallons per minute (gpm)) to prevent groundwater from migrating off site. For cost estimating purposes, the Groundwater IRM is estimated to operate for 15 years.

• Continue to operate the following remedial systems to reduce VOC mass in the Study Area:

o Main Facility Tower 102 remedial system (three wells; total 2,300 gpm) and

o GM-38 Area Groundwater Remedy (two wells; total 1,100 gpm).

The above remedial systems include ex-situ groundwater treatment via air stripping (with off-gas treatment) and discharge to local recharge basins and one injection well (GM-38 Area remedy only).

• Continue to operate the existing wellhead protection systems at Bethpage Water District (BWD) Plants 4 and 5.

New Remedial Elements

• Install one new remedial well (Well RW-21, pumping at 1,000 gpm) to reduce VOC mass in the Study Area groundwater and pipe the recovered water to the Northrop Grumman Main Facility for treatment. Upgrade the Main Facility Remedial System (Tower 102) with a new air stripper blower to treat water from RW-21 and to achieve groundwater effluent discharge limits at the increased hydraulic loading rate. Discharge treated water into the South Basins.

• Install new monitoring wells and use with existing wells to perform plume management, performance monitoring, and effectiveness monitoring.

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• Develop and implement an OM&M plan or similar document, following remedial construction completion.

• Operate Remedial Well RW-21 full-time for 20 years, followed by 5 years of pulsed operation, followed by 5 years of post-remediation groundwater monitoring/naturalattenuation for residual VOCs. Actual operating times, shut down criteria, and post-remediation monitoring requirements will be determined over time based on field data.

The new remedial elements, combined with the baseline remedial elements described above, represent the integral components of a comprehensive solution to VOCs in the regional groundwater.

Comprehensive Recommended Remedy

This FS discusses several remedial systems that are currently in place to address the regional area of VOC-impacted groundwater and recommends further groundwater remedies to provide a comprehensive solution to the regional area of VOC-impactedgroundwater. Additionally, as detailed in the Site Area FS, remedies are also recommended to address impacted soils, soil gas, and source areas. Those remedies, in combination with the recommended groundwater remedies, create a comprehensive, integrated solution to contamination present in both the Site Area and Study Area. The various remedial elements of the Comprehensive Recommended Remedy are summarized below:

Soils

• Alternative S-P2: Excavate upper 2 feet (ft) of soil across Park where Site Area-related COPCs exceed restricted-residential soil cleanup objectives (SCOs) and replace with clean fill.

• Alternative S-AR2: Install gravel cap over Access Road soils where Site Area-related COPCs exceed restricted-residential SCOs.

Source Areas

• Alternative SA-3: Remediate VOC source areas in the Park (i.e., areas exceeding 10 ppm TVOCs) using ISTD to minimize potential migration of VOCs to groundwater and soil gas.

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Soil Gas

• Alternative SG-2: Operate Soil Gas IRM to prevent off-site migration of soil gas until shut down criteria are met.

Groundwater

• Alternative GW-2 (Site Area FS) and Alternative 3 (Study Area FS):

• Continue to operate the Groundwater IRM to prevent off-site migration of groundwater; transition to natural attenuation with monitoring to address residual VOC impacts once Groundwater IRM system shut down criteria are met.

• Continue to operate other groundwater remedial systems to reduce VOC mass in Study Area, specifically the Northrop Grumman Main Facility and GM-38 Area remedial systems.

• Continue to operate wellhead protection systems at BWD Plants 4 and 5.

• Install and operate one new remedial well to reduce VOC mass in Study Area groundwater; treat extracted groundwater in existing Main Facility remedial system. Operate well full-time for 20 years, followed by 5 years of pulsed operation, followed by system shut down and 5 years of post-remediationgroundwater monitoring. Actual operating times, shut down criteria, and post-remediation monitoring requirements will be determined over time based on field data.

• Use existing and newly installed monitoring wells to perform regular monitoring of remedial system performance and for reporting on remedial system effectiveness.

Additional Components of the Comprehensive Remedy

• Perform regular performance monitoring and reporting of remedial system effectiveness. As applicable, implement OM&M plans following remedial construction completion.

• Where applicable, environmental easements for institutional and engineering controls will be incorporated into the recommended alternative to help ensure that

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the Recommended Remedy for the Site and Study Areas is maintained and is protective of human health for reasonably anticipated future land uses.

The total estimated cost for the Comprehensive Recommended Remedy is $64.5 million.

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Study Area Feasibility Study

Operable Unite 3 (Former Grumman Settling Ponds), Bethpage, New YorkNYSDEC Site # 1-30-003A

1. Purpose

The purpose of this FS is to identify and screen remedial technologies and evaluate remedial alternatives for contaminants in groundwater in the Study Area. This FS also presents the Comprehensive Recommended Remedy for OU3 which incorporates theexisting remedial measures, the Site Area recommended remedy and the Study Area recommended remedy. The technology and alternatives evaluations for the Site Area are presented in the Site Area FS. (ARCADIS of New York, Inc. 2011)

This report was prepared by ARCADIS on behalf of Northrop Grumman. It is being submitted pursuant to Section II of the Administrative Order on Consent between the NYSDEC and Northrop Grumman, effective July 4, 2005 (NYSDEC 2005).

2. Study Area Description

2.1 Study Area

For the purposes of this FS, the “Study Area” is defined as the area of VOC-impactedgroundwater hydraulically downgradient (i.e., south and southeast) of and impacted by the Site Area, plus the peripheral area (i.e., an area of significantly lower to non-detectconcentrations of VOCs) that was used to delineate the impacted groundwater (Figure2-1). The Study Area is contained within a larger region of VOC-impacted groundwater.Remedial measures already in place to address this larger region of VOC-impactedgroundwater are discussed below in Section 3.7.

The term “Site Area” hereinafter refers to a portion of the Bethpage Community Park not subject to soil removal during Town redevelopment activities, plus the Former Grumman Plant 24 Access Road (Access Road). For the media soil gas and groundwater, the Site Area includes the entire Bethpage Community Park and the Access Road. A detailed description of the Site Area was presented in the Site Area RI Report (ARCADIS U.S., Inc. 2011b) and the Site Area FS. The Site Area FS addresses remediation of impacted groundwater, source areas, soil, and soil gas. NorthropGrumman implemented a Groundwater IRM in 2009, which is further described in Section 3.7 of this report. In accordance with design objectives, the Groundwater IRM is successfully controlling off-site migration of VOCs to downgradient locations.

The Study Area land surface elevation ranges from approximately 120 feet above mean sea level (ft msl) to 85 ft msl and, topographically, is generally flat. Natural surface water features do not exist in the Study Area, although man-made stormwater recharge




basins are present that receive runoff from paved surfaces and then recharge the groundwater system. Land use currently and historically is primarily residential with some commercial and industrial development. Surface features are shown on Figure2-1.

2.2 Groundwater Use

The BWD operates five public supply wells in three wellfields in the Study Area (Plant 4[Wells 4-1 and 4-2], Plant 5 [Well 5-1], and Plant 6 [Wells 6-1 and 6-2]) (Figure 2-1).Available information indicates that all residents in the Study Area receive water supplyfrom BWD. BWD Plants 4, 5, and 6 are equipped with treatment systems that are operated by BWD to remove VOCs. BWD’s wells are located in the area of regional VOC-impacted groundwater.

Northrop Grumman entered into an agreement with BWD on June 17, 1994 for BWDPlant 4 to fund the design and construction of a wellhead protection system using an air stripping tower. In addition, Northrop Grumman has been funding operation of the Plant 4 treatment system for the past 16 years. The agreement provides for NorthropGrumman’s funding of wellhead protection to treat up to a concentration of 600 micrograms per liter (µg/L) TVOCs down to drinking water standards.

In the first half of 2010, liquid phase granular activated carbon (GAC) polishing was added to the existing wellhead protection system at BWD Plant 4. According to the “Engineering Report/Well Head Treatment Improvements For VOC Removal At Plant No. 4” (H2M 2008), the combined air stripper and GAC polishing system at BWD Plant 4 can treat a design influent TVOC concentration of 5,498 µg/L down to a concentration of less than 0.5 µg/L, while operating at its peak flow rate.

Similar to BWD Plant 4, the Navy entered into an agreement with BWD for Plant 5. The agreement provides for Navy’s funding of wellhead protection up to a concentration of 600 µg/L down to a concentration of 5 µg/L for known contaminants (Fly. 2010).

Similar to BWD Plant 4, Northrop Grumman entered into another agreement with BWDfor Plant 6 on May 22, 1990 (with three amendments, dated March 29, 1996, November 1999, and June 2005). The agreement provides for Northrop Grumman’s funding of wellhead protection up to a concentration of 300 µg/L down to a concentration of non-detect for TVOCs.




3. Summary of RI and Current Remedial Operations

3.1 Previous/Other Investigations

The Study Area is part of the larger region of VOC-impacted groundwater that has been previously investigated and documented by Northrop Grumman, the Navy, the U.S. Geological Survey (USGS), and the OCC (hereinafter referred to as the regional area of either VOC-impacted or TVOC-impacted groundwater). Remedial measures are currently in place to address this regional area of VOC-impacted groundwater, as discussed in Section 3.7. Investigations conducted within the Study Area include theNorthrop Grumman Study Area Rl, a number of investigations conducted by Northrop Grumman prior to 2004, and preceding investigations completed by the Navy, andthe USGS. Data from these investigations were incorporated, as applicable, into the conceptual site model (CSM) and the Study Area Rl Report (ARCADIS U.S., Inc.2010; 2011a).

The following subsections summarize the geology and hydrogeology of the Study Area, the nature and extent of Study Area groundwater impacts, and the CSM. More detailed discussions of these topics are provided in the Study Area Rl Report.

Figures 3-1, 3-2, and 3-3, originally included in the Study Area RI Report, are included in this report.

3.2 Study Area Geology

From land surface downward, the geologic sequence in the Study Area is as follows:

• Pleistocene-age (Upper Glacial) sands of varying grain size with silt, clay and gravel lenses in the unsaturated and saturated zones.

• Cretaceous-age (Magothy) interbedded fine to coarse sands and silts with discontinuous zones of lower permeability clays, sandy clays, and silty clays to a depth of approximately 820 feet below land surface (ft bls).

• Basal Magothy gravel zone, this was encountered during the Northrop Grumman Study Area RI drilling program in VP-104 (Figures 3-2) from 820 to 880 ft bls.

• Cretaceous age clay (Raritan Confining Unit) was encountered at 672 ft bls during the Study Area RI in VP-110R (Figure 3-2). Although it has been documented that regionally this unit underlies the Magothy formation and varies in depth, except for




at VP-110R, all VPBs that were drilled deep enough to reach this unit (based on USGS estimates of the depth of the clay) did not encounter it.

3.3 Study Area Hydrogeology

Groundwater in the Upper Glacial and Magothy aquifers occurs under unconfined conditions, with the Magothy aquifer exhibiting semi-confined to confined conditionswith increasing depth. Groundwater elevation data indicate a general south-southeasterly groundwater flow direction (consistent with the regional flow direction) and a slightly downward vertical gradient. Groundwater velocity in the Study Area ranges from approximately 0.85 to 2.56 feet per day (ft/day). The downward flow has been accentuated by industrial pumping and recharge on the former Grumman Facilityand the NWIRP, as well as by public supply well pumpage (ARCADIS 2009).

3.4 Nature and Extent of Groundwater Contamination in Study Area

Based on the Study Area RI, VOCs were determined to be COPCs in Study Area groundwater. Non-Site Area-related COPCs, consisting of Freons 12 and 22, were also detected in the Study Area and were attributed to a former ice rink operated by the Town. Figure 3-2 depicts the maximum extent of VOC-impacted groundwater in the region in plan view. This figure depicts the average concentration of VOCs from wellsfor the period of 2004 to 2007 or more recent data for wells installed after 2007 and themaximum VOC concentration from vertical profile borings (VPBs) in the Study Area (Northrop Grumman completed 22 VPBs from 2006 to 2009 and Navy completed six VPBs from 2000 to 2002). Well and VPB depths vary throughout the region; however, the data were plotted on a single figure regardless of depth. Therefore, this figure shows the maximum lateral extent and concentration of VOCs in groundwater (i.e., at any particular depth, the VOC concentration would be equal to or less than the value depicted). The maximum extent of VOC-impacted groundwater identified in the Study Area during the RI is approximately 8,300 ft in length and 2,100 ft in width, with a maximum depth of 670 ft bls and a maximum thickness of 430 ft.

Figure 3-3 shows the TVOC concentrations in cross section. The highest TVOCconcentrations observed in the Study Area were at depths ranging from approximately 75 ft bls (northern portion) to 590 ft bls (southern portion). VP-111 exhibited the maximum observed TVOC concentration in the Study Area (10,500 µg/L at a depth of 451 ft bls; TVOC concentrations are less than 500 µg/L at depths shallower than 411 ft bls and deeper than 531 ft bls). Trichloroethene (TCE) and cis-1,2-dichloroethene (cis-1,2-DCE) were determined to be the predominant VOCs detected (based on frequency




of detection and concentration) in groundwater above SCG values, followed by 1,1-dichloroethane (1,1-DCA); tetrachloroethene (PCE); 1,1-dichloroethene (1,1-DCE);vinyl chloride (VC); 1,2-dichloroethane (1,2-DCA); Freon 113; toluene, chloroform, 1,1,1-trichloroethane (1,1,1-TCA); and trans 1,2-dichlorothene (trans-1,2-DCE).

As detailed in the Study Area RI Report, the distribution and concentrations ofperchlorate in the Study Area indicate that this constituent is not Site Area-related. Thedistribution and concentrations of chromium detected in the Study Area (based on the Study Area RI Report) also indicate that this constituent is not Site Area-related.Although the results of the samples collected from Monitoring Well MW111-4 (three rounds) exceed the NYSDEC standard for chromium of 50 µg/L (most recent result from April 2010 was 399 µg/L), the data from surrounding wells are below the standardand suggest a local source of the elevated chromium in Monitoring Well MW111-4.Chromium data will be considered further during remedial design to determine if it might have an effect on the treatment system design and costs.

3.5 Study Area Conceptual Site Model

The CSM developed for the Study Area is shown on Figure 3-1 and is summarized as follows:

• VOC releases from the Site Area and industrial properties west and adjacent to the Site Area resulted in VOC impacts to groundwater.

• Historical pumping and recharge on the former Grumman and NWIRP propertiescaused mixing of VOCs and accentuated downward movement of VOC-impactedgroundwater, resulting in impacts at depths greater than 500 ft bls. The VOC-impacted groundwater that migrated south of the above properties was further influenced by the pumping of public supply wells.

• Several downgradient public supply wells are presently affected by VOC-impactedgroundwater.

• Wellhead treatment of public supply wells for VOCs results in no current humanexposure to VOCs in groundwater.

3.6 Impacted Groundwater

Based on the current understanding, (i.e., initial conditions), the estimated VOC mass in the area of regional TVOC-impacted groundwater (including the Study Area) is approximately 147,000 pounds (lbs), which results from sources originating at the Site




Area, the former Grumman Facility, the former NWIRP site, and the OCC site. Estimates of mass removal for the remedial alternatives presented in Section 6 and Appendix A of this report are based on this estimated initial mass.

3.7 Current Remedial Operations

Several remedial systems have already been implemented, under the oversight of the NYSDEC or U.S. Environmental Protection Agency (USEPA) that collectively address groundwater within the regional area of TVOC-impacted groundwater. These systems consist of the following, which are discussed below:

• Groundwater IRM (referred to in the tables and figures of this report as the Site IRM)

• Northrop Grumman Main Facility (Main Facility) Remedial Systems

• Navy GM-38 Area Remedial System

• Navy Air Sparge/Soil Vapor Extraction (SVE) System

• OCC Biosparge System

Northrop Grumman voluntarily implemented the Groundwater IRM in July 2009, to prevent off-site migration of Site Area-related COPCs in groundwater. This is accomplished by extracting groundwater from four wells (Wells RW-1 to RW-4)installed along the Access Road property, with subsequent treatment of VOCs using an air stripper. As of the end of June 2009, the system has removed from groundwater and treated approximately 700 lbs of VOCs and is predicted to eventually remove a total of approximately 7,800 lbs of VOCs from groundwater. Additional details regarding the Groundwater IRM are provided in the Groundwater IRM Final Design Report (ARCADIS of New York, Inc. 2008).

Northrop Grumman operates two other groundwater remedial systems on the Main Facility in the region that pump a total of approximately 5.5 million gallons per day (mgd). Specifically, Northrop Grumman operates five remedial wells (Wells 1, 3, 17, 18, and 19) and two groundwater treatment systems on the Main Facility (Towers 96 and 102) to prevent off-site migration of VOC-impacted groundwater from the formerGrumman facility and NWIRP site. The groundwater remedial treatment systems described above are effective in meeting their remedial objectives of preventing the off-




site migration of VOCs in groundwater and removing VOC mass from the regional area of VOC-impacted groundwater. As an example, TVOCs in a key monitoring well near the Main Facility have been reduced by 98 percent since system startup, and the Main Facility systems have removed and treated a total of approximately 150,000 lbs of VOCs since Tower 102 startup in 1998. The Tower 96 remedial system initiated operation in 1988.

The Navy operates the GM-38 Area VOC mass removal groundwater remedy, consisting of two remedial wells (GM-38 RW-1 and GM38 RW-3) which remove and treat a total of 1,100 gpm from the regional area of TVOC-impacted groundwater.

The above existing systems have been integrated into the development of the remedial alternatives presented in this FS as a component of the comprehensive solution to VOCs in regional groundwater.

As part of remediation of the NWIRP Bethpage facility, the Navy operated an air sparge/SVE system to address VOCs in shallow groundwater east of Plant 3. Thissystem was operated for several years in the 1990s and was shut down when it reached its shut-down criteria.

As part of the USEPA-issued Groundwater Record of Decision (ROD) for the OCC Site, a biosparge system was installed and is currently operating on the northwest corner of the former Grumman Facility. The purpose of this system is to remediate vinyl chloride in groundwater originating from the OCC site.

4. Remedial Goals and Remedial Action Objectives

This section summarizes the remedial goals and the RAOs for the Study Area.

4.1 Standards, Criteria, and Guidance

Potentially applicable or relevant and appropriate federal, state, and local SCGs form the basis for the remedial goals and objectives for the project, the appropriate remedial alternatives, and the scope and extent to which retained remedial alternatives can be implemented. The SCGs identified for this FS are summarized in Table 4-1.

“Standards and criteria” are cleanup standards, standards of control, and othersubstantive environmental requirements, criteria or limitations that are generally applicable, consistently applied, and officially promulgated under federal or state law




that are either directly applicable to a contaminant, remedial action, location or other circumstance, or that are not directly applicable but are relevant and appropriate.

“Guidance” consists of non-promulgated criteria, advisories, and/or other guidance that are not legal requirements and do not have the same status as “standards andcriteria”; however, remedial alternatives should consider guidance that, based on professional judgment, may be applicable to the project.

4.2 Remedial Goals

Section 27-1301 of the New York State Environmental Conservation Law states that the goals of the inactive hazardous waste disposal site remedial program are to "eliminate, remove, abate, control or monitor health and/or environmental hazards or potential hazards."

Pursuant to Title 6 NYCRR Part 375-2.8(a), (b), and (c) and the DER-10 guidance document (NYSDEC 2010), remedial goals for all remedial actions should include:

• Restoring the site to pre-disposal/pre-release conditions, to the extent feasible,

• Eliminating or mitigating all significant threats to public health and the environment through proper application of scientific and engineering principles,

• Removing sources of contamination to the extent feasible. “Feasible” is defined as suitable to site conditions, capable of being successfully carried out with available technology, implementable, and cost effective (6 NYCRR Part 375-1.2)

4.3 Remedial Action Objectives

RAOs developed for the Study Area to eliminate or mitigate all significant threats to human health and the environment are the following:

• Prevent exposure to Site Area-related VOCs in groundwater within the Study Area and

• Reduce VOC mass in Study Area groundwater to the extent feasible




5. Identification and Screening of Remedial Technologies

The purpose of this section is to identify and screen a range of remedial technologies to address groundwater. Selected technologies are developed into alternatives, which are then further evaluated during the detailed analysis of the remedial alternatives presented in Section 6 of this report.

The list of remedial technologies was developed in cooperation with the NYSDEC and is focused on those technologies that are considered by NYSDEC to be presumptive remedies for VOCs in groundwater. In accordance with NYSDEC guidance (2006), the identified technologies were screened using the following criteria:

• Effectiveness – Potential effectiveness in achieving RAOs; reliability of technology; and potential impacts to human health and the environment,

• Implementability – Technical and administrative feasibility of implementing the technology at the site, and

• Relative cost – Relative cost to implement the technology, including capital cost and cost for OM&M.

The results of the remedial technology screening conducted for Study Areagroundwater are presented in Table 5-1. The technologies that passed the screening step are baseline/continued action, extraction wells, air stripping, recharge basins, injection wells, and natural attenuation.

6. Development and Analysis of Remedial Alternatives

Remedial alternatives to meet the Study Area RAOs were developed using technologies retained from Section 5. Groundwater modeling was used to develop and evaluate the remedial alternatives, as described below.

6.1 Modeling

The updated regional groundwater model was used to evaluate the ability of various remedial alternatives to achieve the Study Area RAOs. The groundwater modeling included the following tasks:




1. The existing model was updated using current data for aquifer pumping and discharge rates, and TVOC distribution. The model was also updated to reflect dual domain advection-diffusion mass transport, which is a method of transport modeling that represents both the mobile and immobile phases of the contaminants.

2. Particle tracking (advective transport) analysis was conducted to identify wells potentially impacted by TVOCs in the Study Area and to evaluate various remedial alternative conceptual designs.

3. Solute transport modeling was conducted to predict TVOC mass loading and peak concentrations at potentially impacted wells and proposed remedial wells under different remedial alternatives and to evaluate changes over time in the extent of the TVOC-impacted groundwater.

The details of the modeling tasks and results are presented in Appendix A. Except for Alternatives 1 and 2, each evaluated remedial alternative included installation of one or more new remedial well(s).

Results of the baseline particle tracking concluded:

• Particles from the Study Area VOC-impacted groundwater do not migrate beyondthe most downgradient BWD well (i.e., Plant 5); and

• The following wells are either currently or potentially impacted in the future byVOCs in Study Area groundwater: BWD wells 4-1, 4-2, 5-1, and 6-2; Main Facility Wells 17, 18, and 19; and the GM-38 Area wells.

Main Facility Remedial Systems Wells 17 and 18, the GM-38 wells, and BWD Well 6-2were not retained for further evaluation in this FS, because these wells are (1)addressed under the Operable Unit 2 (OU2) ROD, which provides for the protection of public health and the environment and (2) the wells are relatively distant from or shallow relative to VOCs in the Study Area. Although the OU2 ROD also addresses Remedial Well 19, this well was retained for further evaluation in this FS because it is a key component of the remedial alternatives evaluated in this FS, given the extent of its zone of capture within the Study Area.

Solute transport modeling was used to estimate the TVOC mass removed by each remedial alternative and to analyze TVOC concentration trends in proposed remedial




wells and potentially impacted wells (Appendix A, Table A-2). The model results, as presented in Appendix A, indicate that all alternatives (except for Alternative 1- NoAction Alternative) achieve TVOC mass reduction in the Study Area and reduce peak concentrations of TVOCs at BWD Plants 4 and 5.

6.2 Description and Analysis of Alternatives

Using the results of the modeling efforts described in Appendix A and the screening of remedial technologies described in Section 5, remedial alternatives were developed and evaluated against the following two general criteria in 6 NYCRR Part 375-1.8:

a. Source Removal and Control Measures: Preference is for source removal and/or treatment. All sources, concentrated solid or semi-solid hazardous substances, dense non-aqueous phase liquid, light non-aqueous phase liquid, and/or grosslycontaminated media shall be removed and/or treated; provided however, if the removal and/or treatment of all such contamination is not feasible, such contamination shall be removed or treated to the greatest extent possible.

b. Groundwater Protection and Control Measures: Restoration of groundwater shall be evaluated to determine the feasibility of measures to restore groundwater quality to meet applicable standards and guidance.

Additionally, under 6 NYCRR Part 375-4.8, “…the remedy selected shall eliminate or mitigate all significant threats to the public health and to the environment…”. This criterion is considered a “threshold criterion” for selection of a remedy under DER-10(NYSDEC 2010). Based on the results of the baseline modeling (Figures 6-6 to 6-8)and the BWD’s stated treatment capacity of BWD Plants 4 and 5 (Section 2.2), protection of public health is satisfied under current and predicted future baseline conditions. That is, treatment of BWD supply wells at Plants 4 and 5 is common to allof the remedial alternatives evaluated (except for Alternative 1- the No Action Alternative) as detailed below:

• The conservative, design influent concentration to BWD Plant 4 is 5,498 µg/L TVOCs (H2M 2008). In comparison, the maximum TVOC concentrations predicted by the model are approximately 400 µg/L in Well 4-1 and 130 µg/L in Well 4-2under baseline conditions (see Figures 6-6 and 6-7). The maximum TVOC concentrations predicted by the model in Wells 4-1 and 4-2 under all the other active alternatives are lower than the predicted baseline concentrations.




Alternative 3 provides the greatest predicted reduction in TVOC concentrations in Wells 4-1 and 4-2, with concentrations attaining SCGs in approximately 20 years.

• The stated treatment capacity of BWD Plant 5 is 600 µg/L TVOCs (Fly 2010). In comparison, the maximum TVOC concentration predicted by the model is approximately 180 µg/L in Well 5-1 under baseline conditions (see Figure 6-8).The maximum TVOC concentrations predicted by the model in Well 5-1under all other active alternatives are lower than the predicted baseline concentration. Alternative 3 provides the greatest predicted reduction in TVOC concentrations in Well 5-1.

Because human health is protected under all alternatives (other than Alternative 1), the remainder of this FS focuses on the mitigation of threats to the environment to the extent feasible (i.e., bulk reduction of groundwater contamination, per DER-10 Section 6.4).

In accordance with 6 NYCRR Part 375–1.8, the remedial alternatives were evaluatedagainst seven remedial selection criteria and sustainability (as defined in Table 6-1).Six remedial alternatives were developed and, as summarized below, all alternatives are shown on Figures 6-1 through 6-5, except for Alternative 1.

1. Alternative 1 – No Action

2. Alternative 2 – Baseline/Continued Action

3. Alternative 3 – Alternative 2 Plus One New Remedial Well

4. Alternative 4 – Alternative 2 Plus Two New Remedial Wells

5. Alternative 5 – Alternative 2 Plus One New Remedial Well and Use of BWD Plant4 as a Remediation System

6. Alternative 6 – Alternative 2 Plus Five New Remedial Wells

Table 6-2 summarizes and evaluates the remedial alternatives developed for Study Area groundwater.




6.3 Preliminary Assessment of Remedial Process Closure Requirements

Remedial process closure requirements (i.e., shutdown criteria) for the selected remedy will be developed and provided in a future OM&M plan or similar document. Inaccordance with guidance provided in DER-10 Section 6.4(b) treatment systemshutdown criteria may include:

• Achieving asymptotic levels in remedial wells or water supply wells, and

• Achieving significant bulk reduction in contamination in groundwater.

Time versus concentration graphs developed from the modeling conducted, suggestthat the time to reach an asymptote will vary among the remedial alternatives (see Appendix A, Figures A-11 to A-15); however, 20 years represents a reasonable average timeframe for costing purposes. The exception is BWD Well 4-1 under Alternative 4, which does not reach asymptotic levels in the 30-year timeframe (seeAppendix A, Figures A-11 to A-15). A bulk reduction in VOCs in groundwater is alsoobserved for each alternative evaluated.

Mass removal and operating cost estimates for the alternatives are based on anassumed 20 years of full-time operation for new remedial wells, followed by 5 years of pulsed operation. The mass and cost estimates are based on an assumed 15 years of Groundwater IRM operation and 30 years of operation for other remedial wells and thepublic supply wells in the Study Area. Actual operating times, shutdown criteria, and post-remediation monitoring requirements will be determined over time based on field data.

7. Recommended Remedy for Study Area

This section summarizes the Recommended Remedy for the Study Area, as well as the sustainability practices that are incorporated into the remedial alternatives.

7.1 Summary of Recommended Remedy for Study Area

Based on the analyses conducted in this FS, the Recommended Remedy for the Study Area incorporates components of the FS Recommended Remedy for the Site Area related to groundwater, and is summarized below.




Baseline Remedial Elements:

• Remediate Site Area VOC source areas (i.e., TVOCs greater than 10 ppm (in soil and groundwater) using ISTD to reduce TVOC concentrations to 1 ppm or less.

• Continue OM&M of the existing Groundwater IRM (four wells; total 210 gpm) to prevent groundwater from migrating off site. For cost estimating purposes, theGroundwater IRM is estimated to operate for 15 years.

• Continue to operate the following remedial systems to reduce VOC mass in the Study Area:

o Main Facility Tower 102 remedial system (three wells; total 2,300 gpm) and

o GM-38 Area Groundwater Remedy (two wells; total 1,100 gpm).

The above remedial systems include ex-situ groundwater treatment via air stripping (with off-gas treatment) and discharge to local recharge basins and one injection well (GM-38 Area remedy only).

• Continue to operate the existing wellhead protection systems at BWD Plants 4 and 5.

New Remedial Elements:

• Install one new remedial well (Well RW-21, pumping at 1,000 gpm) to reduce VOC mass in the Study Area groundwater and pipe the recovered water to the Main Facility for treatment. Upgrade the Main Facility Remedial System (Tower 102)with a new air stripper blower to treat water from RW-21 and to achievegroundwater effluent discharge limits at the increased hydraulic loading rate.Discharge treated water into the South Basins.

• Install new monitoring wells and use with existing wells to perform plumemanagement, performance, and effectiveness monitoring.

• Develop and implement an OM&M plan or similar document, following remedial construction completion.




• Operate Remedial Well RW-21 full-time for 20 years, followed by 5 years of pulsed operation, followed by 5 years of post-remediation groundwater monitoring/natural attenuation for residual VOCs. Actual operating times, shutdown criteria, and post-remediation monitoring requirements will be determined over time based on field data.

The new remedial elements, combined with the baseline remedial elements described above, represent the integral components of a comprehensive solution to VOCs in the regional groundwater. A detailed rationale for selection of the Recommended Remedyfor the Study Area is provided in Table 6-2.

As presented in Table 6-2, the Recommended Remedy for the Study Area meets thefollowing criteria:

• Protects human health through treatment of BWD water supplies to meet drinking water standards,

• Protects the environment through TVOC bulk mass removal,

• Capable of achieving RAOs,

• Complies with SCGs, to the extent feasible,

• Technically and administratively implementable,

• Effective in short term and long term,

• Reduces the toxicity, volume, and mobility of contaminants through treatment, to the extent feasible, and

• Cost effective approach to comprehensive solution to VOCs in regional groundwater.

7.2 Sustainable Practices for the Recommended Alternative

In addition to the above regulatory-driven selection criteria, Northrop Grumman has considered alternatives that conserve energy and other resources and will continue to evaluate use of sustainable practices during the remedy design, construction, and operation phases, such as:




• Return treated water to the aquifer (currently practiced),

• Maximize use of existing equipment (e.g., use of Main Facility remedial system to treat RW-21 effluent),

• Specify energy-efficient equipment; use variable frequency drives to reduce energy demands,

• Reduce equipment footprints to minimize land disturbance,

• Use green structures for housing equipment (e.g., Leadership in Energy and Environmental Design [LEED]-certified materials), and

• Conduct remedial system evaluations (RSEs) to routinely assess and optimize system performance and evaluate opportunities to reduce energy needs and downsize or reduce equipment, as appropriate.

8. Summary of Comprehensive Recommended Remedy

Section 3.7 of this FS discusses several remedial systems that are currently in place to address the regional area of VOC-impacted groundwater. As described in Section 7 ofthis FS, further groundwater remedies are recommended to supplement those already in place and provide a comprehensive solution to the regional area of VOC-impactedgroundwater. Additionally, as detailed in the Site Area FS, remedies are also recommended to address impacted soils, soil gas, and source areas. Those remedies in combination with the recommended groundwater remedies create a comprehensive, integrated solution to contamination present in both the Site Area and Study Area. Detailed descriptions and estimated costs for the various remedial elements of the Comprehensive Recommended Remedy are provided in Table 8-1 and are summarized below:

Soils

Park Soils - Alternative S-P2:

• Excavate upper 2 ft of soil across Park where Site Area-related COPCs exceedrestricted-residential SCOs and replace with clean fill.




• Install a demarcation layer between clean fill and remaining soils, where applicable.

Access Road Soils - Alternative S-AR2:

� Install gravel cap over Access Road soils where Site Area-related COPCs exceedrestricted-residential SCOs.

� Install fencing and signs to control access.

Source Areas

Alternative SA-3:

� Remediate Site Area VOC source areas (i.e., TVOCs greater than 10 ppm in soil and groundwater) using ISTD to reduce TVOC concentrations to 1 ppm or less.

Soil Gas

Alternative SG-2:

� Continue OM&M of the existing Soil Gas IRM to prevent the off-site migration of Site Area soil gas until IRM shutdown criteria are achieved (shutdown criteria will be provided in the OM&M Manual).

Groundwater

Alternatives GW-2 and 3:

� Continue to operate Groundwater IRM to prevent off-site migration of groundwater;transition to natural attenuation with monitoring to address residual VOC impacts once Groundwater IRM system shutdown criteria met.

� Continue to operate existing groundwater remedial systems to reduce VOC mass in the regional area of TVOC-impacted groundwater, including Main Facility andGM-38 Area groundwater remedial systems.

� Continue to operate wellhead protection systems at BWD Plants 4 and 5.




� Install and operate one new remedial well to reduce VOC mass in Study Area groundwater; treat extracted groundwater in existing Main Facility Tower 102 treatment system. Operate well full-time for 20 years, followed by 5 years of pulsed operation, followed by shutdown and 5 years of post-remediation groundwater monitoring. Actual operating times, shutdown criteria, and post-remediationmonitoring requirements will be determined over time based on field data.

� Use existing and newly installed monitoring wells to perform regular monitoring of remedial system performance and for reporting on remedial system effectiveness.

Additional Components of the Comprehensive Recommended Remedy

� Perform regular performance monitoring and reporting of remedial system effectiveness. As applicable, implement OM&M plans following remedial construction completion.

� Where applicable, environmental easements for institutional and engineering controls will be incorporated into the recommended alternative to help ensure that the Comprehensive Recommended Remedy is maintained and is protective of human health for reasonably anticipated future land uses.

The rationale for the Comprehensive Recommended Remedy is that it achieves the RAOs, satisfies the FS selection criteria, and offers the following benefits:

� Protection of human health and the environment;

� Prevention of exposure to COPCs above restricted residential SCOs in soils orimplementation of other approved approaches to eliminate or mitigate significant threats;

� Reduction of VOC concentrations in source areas to minimize potential migrationof VOCs to groundwater and soil gas;

� Prevention of on-site exposure to Site Area-related VOCs in soil gas exceedingNYSDOH air guidelines;

� Control of off-site migration of VOCs in groundwater and soil gas;




� Prevention of exposure to COPCs in groundwater including ingestion of groundwater exceeding SCGs; and

� Reduction in VOC mass in groundwater to the extent feasible.

Furthermore, based on the conclusions in the HHRA prepared by Northrop Grumman for OU3, there are no significant threats to human health from subsurface soils and theRecommended Remedy for the Site Area is fully protective of human health under current and expected future site use conditions.

The total estimated cost for the Comprehensive Recommended Remedy is $64.5million.




9. References

ARCADIS of New York, Inc. 2008. Final Design Report - Operable Unit 3 Groundwater Interim Remedial Measure, Former Grumman Settling Ponds, Bethpage, New York. NYSDEC Site # 1-30-003A. August 2008.

ARCADIS of New York, 2011. Site Area Feasibility Study, Operable Unit 3 (Former Grumman Settling Ponds), Bethpage, New York. March 4, 2011.

ARCADIS U.S., Inc. 2010. Supplement to the Remedial Investigation Report (Study Area Groundwater), Operable Unit 3 (Former Grumman Settling Ponds) Bethpage, New York. March 5, 2010.

ARCADIS U.S., 2011a. Remedial Investigation Report (Study Area Groundwater), Operable Unit 3 (Former Grumman Settling Ponds), Bethpage, New York. February7, 2011.

ARCADIS U.S., Inc. 2011b. Remedial Investigation Report (Site Area), Operable Unit 3 (Former Grumman Settling Ponds), Bethpage, New York. March 4, 2011.

Fly, Lora. 2010. Correspondence from Ms. Lora Fly (NAVFAC) to Mr. Kent Smith (Northrop Grumman). Re: Information. May 10, 2010.

H2M 2008. Engineering Report, Well Head Treatment Improvements for VOC Removal at Plant No. 4, Bethpage Water District, Town of Oyster Bay, Nassau County, New York. October 2008.

New York State Department of Environmental Conservation (NYSDEC). 2010. DER-10Technical Guidance for Site Investigation and Remediation. May 2010.

New York State Department of Environmental Conservation (NYSDEC). 2006. New York State Brownfield Cleanup Program, Development of Soil Cleanup Objectives, Technical Support Document. September.2006

New York State Department of Environmental Conservation (NYSDEC). 2005. Administrative Order on Consent Index # W1-0018-04-01, Site # 1-30-003A. July 4, 2005.

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tent

ially

app

licab

le d

epen

ding

on

desi

gnat

ed

wat

er u

se.

Nat

iona

lPrim

ary

Drin

king

Wat

er

Stan

dard

s

40 C

FR P

art 1

41S

Esta

blis

hes

max

imum

con

tam

inan

t lev

els

(MC

Ls) w

hich

are

hea

lth-b

ased

sta

ndar

ds

for p

ublic

wat

er s

uppl

y sy

stem

s.

Pote

ntia

lly a

pplic

able

for g

roun

dwat

er re

late

d re

med

iala

ctio

ns.

RC

RA

-Reg

ulat

edLe

vels

for T

oxic

C

hara

cter

istic

sLe

achi

ng P

roce

dure

(T

CLP

) Con

stitu

ents

40 C

FR P

art 2

61S

Thes

e re

gula

tions

spe

cify

the

TCLP

co

nstit

uent

leve

ls fo

r ide

ntifi

catio

n of

ha

zard

ous

was

tes

that

exh

ibit

the

char

acte

ristic

of t

oxic

ity.

Pote

ntia

lly a

pplic

able

to re

med

ial a

ctiv

ities

that

ge

nera

te w

aste

mat

eria

ls th

atm

ayre

quire

sam

plin

g/an

alys

isfo

r TC

LP c

onst

ituen

ts to

de

term

ine

if th

e m

ater

ials

are

haz

ardo

us(b

ased

on

the

char

acte

ristic

of t

oxic

ity)p

rior t

o di

spos

al.

Uni

vers

al T

reat

men

t St

anda

rds/

Land

Dis

posa

l Res

tric

tions

(U

TS/L

DR

s)

40 C

FR P

art 2

68S

Iden

tifie

s ha

zard

ous

was

tes

for w

hich

la

nd d

ispo

sal i

s re

stric

ted

and

prov

ides

a

set o

f num

eric

al c

onst

ituen

t con

cent

ratio

n cr

iteria

at w

hich

haz

ardo

us w

aste

is

rest

ricte

d fro

m la

nd d

ispo

sal (

with

out

treat

men

t).

Appl

icab

le if

was

te m

ater

ial i

s de

term

ined

to b

e ha

zard

ous

and

is d

esig

nate

d fo

r off-

site

land

di

spos

al.

Tabl

e4-

1.Po

tent

ial C

hem

ical

-, A

ctio

n-, a

nd L

ocat

ion-

Spec

ific

Stan

dard

s, C

riter

ia, a

nd G

uide

lines

(SC

Gs)

Stud

y A

rea

Feas

ibili

ty S

tudy

, Nor

thro

p G

rum

man

Sys

tem

s C

orpo

ratio

nO

pera

ble

Uni

t 3 (F

orm

er G

rum

man

Set

tling

Pon

ds),

Bet

hpag

e, N

ew Y

ork.

4/8/

2011

g:\a

proj

ect\n

orth

rop

grum

man

\sup

erfu

nd\2

011\

ou3\

ny00

1496

.081

1 ri

fs\re

vise

d st

udy

area

fs\fi

nal r

epor

t\tab

les\t

able

4-1

.doc

Page

2of

8

Reg

ulat

ion

Cita

tion

Pote

ntia

lSt

anda

rd (S

) or

Gui

danc

e (G

)Su

mm

ary

of R

equi

rem

ents

App

licab

ility

to th

e R

emed

ial D

esig

n/R

emed

ialA

ctio

n

New

Yor

k St

ate

Envi

ronm

enta

lR

emed

iatio

nPr

ogra

ms

6 N

YCR

R P

art 3

75,

as a

men

ded

12/1

4/06

S/G

Des

crib

es p

roce

ss fo

r the

dev

elop

men

t an

d ex

ecut

ion

of re

med

ial p

rogr

ams

inN

ew Y

ork

Stat

e (N

YS),

and

prov

ides

soi

l cl

eanu

p ob

ject

ives

(SC

Os)

for v

ario

us s

ite

usag

es.

Appl

icab

le fo

r site

inve

stig

atio

n, re

med

y se

lect

ion,

an

dsi

te re

med

iatio

n.

NYS

DEC

Am

bien

t W

ater

Qua

lity

Stan

dard

s an

d G

uida

nce

Valu

es

Div

isio

n of

Wat

er

Tech

nica

l and

Ope

ratio

nal

Gui

danc

e Se

ries

(TO

GS)

Sect

ion

1.0

(6/9

8, re

vise

d 4/

00)

S/G

Prov

ides

a c

ompi

latio

n of

am

bien

t wat

er

qual

ity s

tand

ards

and

gui

danc

e va

lues

for

toxi

c an

d no

n-co

nven

tiona

l pol

luta

nts

for

use

in th

e N

YSD

EC p

rogr

ams.

Thes

e st

anda

rds

and

guid

ance

val

ues

are

appl

icab

le to

site

rem

edia

l pro

gram

s an

d sh

ould

be

cons

ider

ed in

eva

luat

ing

grou

ndw

ater

and

sur

face

w

ater

qua

lity,

rem

edia

tion,

sta

ndar

ds, a

nd

rem

edia

tion

wat

er d

isch

arge

sta

ndar

ds.

Iden

tific

atio

n an

d Li

stin

g of

Haz

ardo

us

Was

tes

6 N

YCR

R P

art 3

71S

Out

lines

crit

eria

for d

eter

min

ing

if a

solid

w

aste

is a

haz

ardo

us w

aste

and

sub

ject

to

regu

latio

n un

der 6

NYC

RR

Par

ts 3

70th

ru37

6.

Appl

icab

le fo

r det

erm

inin

g if

was

te m

ater

ial

gene

rate

d du

ring

impl

emen

tatio

n of

rem

edia

l ac

tiviti

es a

re h

azar

dous

was

tes.

The

se re

gula

tions

do

not

set

cle

anup

sta

ndar

ds, b

ut a

re c

onsi

dere

d w

hen

deve

lopi

ng re

med

ial a

ltern

ativ

es.

New

Yor

k St

ate

Surf

ace

Wat

er a

nd

Gro

undw

ater

Qua

lity

Stan

dard

s

6 N

YCR

R P

arts

700

th

ru 7

06S

Esta

blis

hes

qual

ity s

tand

ards

for s

urfa

ce

wat

er a

nd g

roun

dwat

er.

Appl

icab

le fo

r ass

essi

ng w

ater

qua

lity

at th

e si

te

durin

g re

med

ial a

ctiv

ities

.

Pote

ntia

l Act

ion-

Spec

ific

SCG

s

Occ

upat

iona

l Saf

ety

and

Hea

lth A

ct

(OSH

A)-

Gen

eral

Indu

stry

Sta

ndar

ds

29 C

FR P

art 1

910

STh

ese

regu

latio

ns s

peci

fy th

e 8-

hour

tim

e-w

eigh

ted

aver

age

conc

entra

tion

for

wor

ker e

xpos

ure

to v

ario

us c

ompo

unds

.Tr

aini

ng re

quire

men

ts fo

r wor

kers

at

haza

rdou

s w

aste

ope

ratio

ns a

re s

peci

fied

in 2

9 C

FR 1

910.

120.

Appl

icab

le w

here

rem

edia

l con

stru

ctio

n,m

aint

enan

ce, o

r mon

itorin

gac

tiviti

es h

ave

the

pote

ntia

l to

expo

sure

wor

kers

to s

ite-r

elat

edco

ntam

inan

tsor

cre

ate

job

rela

ted

inju

ry.

Tabl

e4-

1.Po

tent

ial C

hem

ical

-, A

ctio

n-, a

nd L

ocat

ion-

Spec

ific

Stan

dard

s, C

riter

ia, a

nd G

uide

lines

(SC

Gs)

Stud

y A

rea

Feas

ibili

ty S

tudy

, Nor

thro

p G

rum

man

Sys

tem

s C

orpo

ratio

nO

pera

ble

Uni

t 3 (F

orm

er G

rum

man

Set

tling

Pon

ds),

Bet

hpag

e, N

ew Y

ork.

4/8/

2011

g:\a

proj

ect\n

orth

rop

grum

man

\sup

erfu

nd\2

011\

ou3\

ny00

1496

.081

1 ri

fs\re

vise

d st

udy

area

fs\fi

nal r

epor

t\tab

les\t

able

4-1

.doc

Page

3of

8

Reg

ulat

ion

Cita

tion

Pote

ntia

lSt

anda

rd (S

) or

Gui

danc

e (G

)Su

mm

ary

of R

equi

rem

ents

App

licab

ility

to th

e R

emed

ial D

esig

n/R

emed

ialA

ctio

n

OSH

A-S

afet

y an

d H

ealth

Sta

ndar

ds29

CFR

Par

t 192

6S

Thes

e re

gula

tions

spe

cify

the

type

of

safe

ty e

quip

men

t and

pro

cedu

res

to b

e fo

llow

ed d

urin

g si

te re

med

iatio

n.

Appl

icab

le w

here

rem

edia

l con

stru

ctio

n,

mai

nten

ance

, or m

onito

ring

activ

ities

hav

e th

e po

tent

ial t

o ex

posu

re w

orke

rs to

site

-rel

ated

cont

amin

ants

or c

reat

e jo

b re

late

d in

jury

. O

SHA

-Rec

ord-

keep

ing,

Rep

ortin

gan

d R

elat

ed

Reg

ulat

ions

29 C

FR P

art 1

904

STh

ese

regu

latio

ns o

utlin

e re

cord

-kee

ping

and

repo

rting

requ

irem

ents

for a

n em

ploy

er u

nder

OSH

A, a

nd a

pply

to th

e co

mpa

ny(s

) con

tract

ed to

inst

all,

oper

ate,

an

d m

aint

ain

rem

edia

l act

ions

at

haza

rdou

s w

aste

site

s.

Appl

icab

le w

here

rem

edia

l con

stru

ctio

n,

mai

nten

ance

, or m

onito

ring

activ

ities

hav

e th

e po

tent

ial t

o ex

posu

re w

orke

rs to

site

-rel

ated

cont

amin

ants

or c

reat

e jo

b re

late

d in

jury

.

RC

RA

-Pr

epar

edne

ss a

nd

Prev

entio

n

40 C

FR P

art 2

64.3

0-

264.

31S

Thes

e re

gula

tions

out

line

requ

irem

ents

fo

r saf

ety

equi

pmen

t and

spi

ll co

ntro

l w

hen

treat

ing,

han

dlin

g an

d/or

sto

ring

haza

rdou

s w

aste

s.

Pote

ntia

lly a

pplic

able

to re

med

ial a

ctiv

ities

.

RC

RA

-Con

tinge

ncy

Plan

and

Em

erge

ncy

Proc

edur

es

40 C

FR P

art2

64.5

0-

264.

56S

Prov

ides

requ

irem

ents

for e

mer

genc

y co

ntin

genc

y pl

anni

ng a

nd p

roce

dure

s to

be

use

d fo

llow

ing

expl

osio

ns, f

ires,

etc

. w

hen

stor

ing

haza

rdou

s w

aste

s.

Pote

ntia

lly a

pplic

able

to re

med

ial a

ctiv

ities

.

CW

A-D

isch

arge

to

Wat

ers

of th

e U

.S.,

and

Sect

ion

404

40 C

FR P

arts

403

, an

d 23

0 Se

ctio

n 40

4 (b

) (1)

;33

USC

134

4

SEs

tabl

ishe

s si

te-s

peci

fic p

ollu

tant

di

scha

rge

limita

tions

and

per

form

ance

st

anda

rds

that

are

desi

gned

to p

rote

ct

surfa

ce w

ater

qua

lity.

Typ

es o

f dis

char

ges

regu

late

d un

der C

WA

incl

ude:

indi

rect

di

scha

rge

to a

PO

TW, a

nd d

isch

arge

of

dred

ged

or fi

ll m

ater

ial i

nto

U.S

. wat

ers.

Pote

ntia

lly a

pplic

able

to re

med

ial a

ctiv

ities

.

Tabl

e4-

1.Po

tent

ial C

hem

ical

-, A

ctio

n-, a

nd L

ocat

ion-

Spec

ific

Stan

dard

s, C

riter

ia, a

nd G

uide

lines

(SC

Gs)

Stud

y A

rea

Feas

ibili

ty S

tudy

, Nor

thro

p G

rum

man

Sys

tem

s C

orpo

ratio

nO

pera

ble

Uni

t 3 (F

orm

er G

rum

man

Set

tling

Pon

ds),

Bet

hpag

e, N

ew Y

ork.

4/8/

2011

g:\a

proj

ect\n

orth

rop

grum

man

\sup

erfu

nd\2

011\

ou3\

ny00

1496

.081

1 ri

fs\re

vise

d st

udy

area

fs\fi

nal r

epor

t\tab

les\t

able

4-1

.doc

Page

4of

8

Reg

ulat

ion

Cita

tion

Pote

ntia

lSt

anda

rd (S

) or

Gui

danc

e (G

)Su

mm

ary

of R

equi

rem

ents

App

licab

ility

to th

e R

emed

ial D

esig

n/R

emed

ialA

ctio

n

RC

RA

-Gen

eral

Stan

dard

s40

CFR

Par

t 264

.111

SG

ener

al p

erfo

rman

ce s

tand

ards

requ

iring

m

inim

izat

ion

of n

eed

for f

urth

er

mai

nten

ance

and

con

trol;

min

imiz

atio

n or

el

imin

atio

n of

pos

t-clo

sure

esc

ape

of

haza

rdou

s w

aste

, haz

ardo

us c

onst

ituen

ts,

leac

hate

, con

tam

inat

ed ru

noff,

or

haza

rdou

s w

aste

dec

ompo

sitio

n pr

oduc

ts.

Also

requ

ires

deco

ntam

inat

ion

or d

ispo

sal

of c

onta

min

ated

equ

ipm

ent,

stru

ctur

es

and

soils

.

Pote

ntia

lly a

pplic

able

to re

med

ial c

onst

ruct

ion

mai

nten

ance

, and

mon

itorin

gac

tiviti

es.

Stan

dard

s A

pplic

able

to

Tra

nspo

rter

s of

A

pplic

able

Haz

ardo

us W

aste

-R

CR

A S

ectio

n 30

03

40 C

FR P

arts

170

-17

9,26

2, a

nd 2

63S

Esta

blis

hes

the

resp

onsi

bilit

y of

off-

site

trans

porte

rs o

f haz

ardo

us w

aste

in th

e ha

ndlin

g, tr

ansp

orta

tion

and

man

agem

ent

of th

e w

aste

. Req

uire

s m

anife

stin

g,

reco

rdke

epin

g an

d im

med

iate

act

ion

in

the

even

t of a

dis

char

ge.

Thes

e re

quire

men

tsar

eap

plic

able

to a

ny

com

pany

(s) c

ontra

cted

to tr

ansp

ort h

azar

dous

m

ater

ial.

Uni

ted

Stat

es

Dep

artm

ent o

f Tr

ansp

orta

tion

(USD

OT)

Rul

es fo

r Tr

ansp

orta

tion

of

Haz

ardo

us M

ater

ials

49 C

FR P

arts

107

an

d 17

1.1

-172

.558

SO

utlin

es p

roce

dure

s fo

r the

pac

kagi

ng,

labe

ling,

man

ifest

ing

and

trans

porti

ng o

f ha

zard

ous

mat

eria

ls.

Thes

e re

quire

men

ts a

reap

plic

able

to a

ny

com

pany

(s) c

ontra

cted

to tr

ansp

ort h

azar

dous

m

ater

ial.

Cle

an A

ir A

ct-

Nat

iona

l Am

bien

t Air

Qua

lity

Stan

dard

s

40 C

FR P

art 5

0S

Esta

blis

hes

ambi

ent a

ir qu

ality

sta

ndar

ds

for p

rote

ctio

n of

pub

lic h

ealth

.Ap

plic

able

to re

med

ial s

yste

ms

that

gen

erat

e ai

r em

issi

ons.

USE

PA-A

dmin

iste

red

Perm

it Pr

ogra

m: T

he

Haz

ardo

us W

aste

Pe

rmit

Prog

ram

RC

RA

Sect

ion

3005

; 40

CFR

Par

t 270

.124

SC

over

s th

e ba

sic

perm

ittin

g, a

pplic

atio

n,m

onito

ring

and

repo

rting

requ

irem

ents

for

off-s

ite h

azar

dous

was

te m

anag

emen

t fa

cilit

ies.

Any

off-s

ite fa

cilit

y ac

cept

ing

haza

rdou

s w

aste

m

ust b

e pr

oper

ly p

erm

itted

. Im

plem

enta

tion

of th

e re

med

y w

ill in

clud

e co

nsid

erat

ion

of th

ese

requ

irem

ents

.N

ew Y

ork

Air

Qua

lity

Cla

ssifi

catio

n Sy

stem

6 N

YCR

R P

art 2

56S

Out

lines

the

air q

ualit

y cl

assi

ficat

ions

for

diffe

rent

land

use

s an

d po

pula

tion

dens

ities

.

Air q

ualit

y cl

assi

ficat

ion

syst

em w

ill be

con

side

red

durin

g th

e tre

atm

ent p

roce

ss d

esig

n.

Tabl

e4-

1.Po

tent

ial C

hem

ical

-, A

ctio

n-, a

nd L

ocat

ion-

Spec

ific

Stan

dard

s, C

riter

ia, a

nd G

uide

lines

(SC

Gs)

Stud

y A

rea

Feas

ibili

ty S

tudy

, Nor

thro

p G

rum

man

Sys

tem

s C

orpo

ratio

nO

pera

ble

Uni

t 3 (F

orm

er G

rum

man

Set

tling

Pon

ds),

Bet

hpag

e, N

ew Y

ork.

4/8/

2011

g:\a

proj

ect\n

orth

rop

grum

man

\sup

erfu

nd\2

011\

ou3\

ny00

1496

.081

1 ri

fs\re

vise

d st

udy

area

fs\fi

nal r

epor

t\tab

les\t

able

4-1

.doc

Page

5of

8

Reg

ulat

ion

Cita

tion

Pote

ntia

lSt

anda

rd (S

) or

Gui

danc

e (G

)Su

mm

ary

of R

equi

rem

ents

App

licab

ility

to th

e R

emed

ial D

esig

n/R

emed

ialA

ctio

n

Nat

iona

l Em

issi

onSt

anda

rds

for

Haz

ardo

us A

ir Po

lluta

nts

(NES

HA

P)

40 C

FR P

art 6

1S

Prov

ides

aire

mis

sion

sta

ndar

ds fo

r ha

zard

ous

air p

ollu

tant

s.Ap

plic

able

to re

med

ial s

yste

ms

that

gen

erat

e ai

r em

issi

ons.

Rem

edia

l sys

tem

des

ign

will

cons

ider

ap

prop

riate

air e

mis

sion

s co

ntro

ls to

mee

t the

se

regu

latio

ns.

New

Yor

k Pe

rmits

an

d C

ertif

icat

es6

NYC

RR

Par

t 201

SPr

ovid

es in

stru

ctio

ns a

nd re

gula

tions

for

obta

inin

g a

perm

it to

ope

rate

an

air

emis

sion

sou

rce.

Als

o pr

ovid

es

inst

ruct

ions

on

wha

t to

do in

cas

e of

m

alfu

nctio

n.

NYS

per

mits

are

not

requ

ired

for r

emed

ial a

ctio

ns

impl

emen

ted

unde

r Con

sent

Ord

er a

t NYS

Inac

tive

Haz

ardo

usW

aste

site

s; h

owev

er, d

ocum

enta

tion

will

be d

evel

oped

to a

ssur

e re

leva

nt a

nd

appr

opria

te p

erm

it co

nditi

ons

are

com

plie

d w

ith.

New

Yor

k Em

issi

ons

Test

ing,

Sam

plin

g,

and

Ana

lytic

al

Det

erm

inat

ions

6 N

YCR

R P

art 2

02S

Out

lines

requ

irem

ents

for e

mis

sion

s te

stin

g fo

r air

emis

sion

sou

rces

. St

ates

th

at in

depe

nden

t em

issi

ons

test

ing

can

be

orde

red

by th

e C

omm

issi

oner

of t

he

NYS

DEC

.

Appl

icab

le to

rem

edia

l sys

tem

s as

em

issi

ons

from

tre

atm

ent p

roce

dure

mus

t be

anal

yzed

.

New

Yor

k R

egul

atio

ns fo

r G

ener

al P

roce

ss

Emis

sion

s

6 N

YCR

R P

art 2

12S

Out

lines

the

proc

edur

e of

env

ironm

enta

l ra

ting.

The

Com

mis

sion

er d

eter

min

es a

ra

ting

of e

mis

sion

s ba

sed

on s

ampl

ing.

The

Com

mis

sion

er w

ill is

sue

an e

nviro

nmen

tal

ratin

g fo

r em

issi

ons

base

d on

this

regu

latio

n.

Prot

ectio

n of

Si

gnifi

cant

Det

erio

ratio

n of

Air

Qua

lity

(PSD

)

40 C

FR P

art 5

1.2

SN

ew m

ajor

sta

tiona

ry s

ourc

es m

ay b

e su

bjec

t to

PSD

revi

ew [i

.e.,

requ

ire b

est

avai

labl

e co

ntro

l tec

hnol

ogy

(BAC

T),

low

est a

chie

vabl

e de

tect

ion

limit

(LAE

L),

and/

or e

mis

sion

off-

sets

.

If ne

cess

ary,

PSD

pro

cedu

res

will

be in

clud

ed in

th

e re

med

ial d

esig

n/re

med

ial a

ctio

n pr

oces

s. T

he

proc

edur

es c

ould

be

expa

nded

to B

ACT

and

LAEL

ev

alua

tions

.

New

York

Air

Qua

lity

Stan

dard

s6

NYC

RR

Par

t 257

SPr

ovid

es a

ir qu

ality

sta

ndar

ds fo

r diff

eren

t ch

emic

als

(incl

udin

g th

ose

foun

d at

the

site

), pa

rticl

es, a

nd p

roce

sses

.

Appl

icab

le to

rem

edia

l sys

tem

s. E

mis

sion

s fro

m

treat

men

t pro

cess

es w

ill m

eet t

he a

ir qu

ality

stan

dard

s.La

nd D

ispo

sal

Res

tric

tions

40 C

FR P

art 2

68S

Res

trict

s la

nd d

ispo

sal o

f haz

ardo

us

was

tes

that

exc

eed

spec

ific

crite

ria.

Esta

blis

hes

Uni

vers

al T

reat

men

t St

anda

rds

(UTS

s) to

whi

ch h

azar

dous

w

aste

mus

t be

treat

ed p

rior t

o la

nd

disp

osal

.

Was

te m

ater

ials

that

dis

play

the

char

acte

ristic

of

haza

rdou

s w

aste

or t

hat a

re re

-cha

ract

eriz

ed a

fter

gene

ratio

n m

ust b

e tre

ated

to 9

0% c

onst

ituen

t co

ncen

tratio

n re

duct

ion

capp

ed a

t 10

times

the

UTS

.

Tabl

e4-

1.Po

tent

ial C

hem

ical

-, A

ctio

n-, a

nd L

ocat

ion-

Spec

ific

Stan

dard

s, C

riter

ia, a

nd G

uide

lines

(SC

Gs)

Stud

y A

rea

Feas

ibili

ty S

tudy

, Nor

thro

p G

rum

man

Sys

tem

s C

orpo

ratio

nO

pera

ble

Uni

t 3 (F

orm

er G

rum

man

Set

tling

Pon

ds),

Bet

hpag

e, N

ew Y

ork.

4/8/

2011

g:\a

proj

ect\n

orth

rop

grum

man

\sup

erfu

nd\2

011\

ou3\

ny00

1496

.081

1 ri

fs\re

vise

d st

udy

area

fs\fi

nal r

epor

t\tab

les\t

able

4-1

.doc

Page

6of

8

Reg

ulat

ion

Cita

tion

Pote

ntia

lSt

anda

rd (S

) or

Gui

danc

e (G

)Su

mm

ary

of R

equi

rem

ents

App

licab

ility

to th

e R

emed

ial D

esig

n/R

emed

ialA

ctio

n

RC

RA

Sub

title

C40

U.S

.C. S

ectio

n 69

01 e

t seq

.;40

CFR

Par

t 268

SR

estri

cts

land

dis

posa

l of h

azar

dous

w

aste

s th

at e

xcee

d sp

ecifi

c cr

iteria

.Es

tabl

ishe

s U

TSs

to w

hich

haz

ardo

us

was

tes

mus

t be

treat

ed p

rior t

o la

nd

disp

osal

.

Pote

ntia

lly a

pplic

able

to re

med

ial a

ctiv

ities

that

in

clud

e di

spos

al o

f gen

erat

ed w

aste

.

NYS

DEC

’sM

onito

ring

Wel

l D

ecom

mis

sion

ing

Gui

delin

es

NPL

Site

Mon

itorin

g W

ell

Dec

omm

issi

onin

gda

ted

May

199

5

GTh

is g

uida

nce

pres

ents

pro

cedu

re fo

r ab

ando

nmen

t of m

onito

ring

wel

ls a

t re

med

iatio

n si

tes.

This

gui

danc

e is

app

licab

le fo

r rem

edia

lal

tern

ativ

es th

at re

quire

the

deco

mm

issi

onin

g of

m

onito

ring

wel

ls.

Gui

delin

es fo

r the

C

ontr

ol o

f Tox

ic

Ambi

ent A

ir C

onta

min

ants

DAR

-1 (A

ir G

uide

1)

GPr

ovid

es g

uida

nce

for t

he c

ontro

l of t

oxic

am

bien

t air

cont

amin

ants

in N

ew Y

ork

Stat

e an

d ou

tline

s th

e pr

oced

ures

for

eval

uatin

g so

urce

s of

air

pollu

tion

This

gui

danc

e is

appl

icab

lefo

rrem

edia

lal

tern

ativ

es th

at re

sult

in a

ir em

issi

ons.

New

Yor

k H

azar

dous

W

aste

Man

agem

ent

Syst

em-G

ener

al

6 N

YCR

R P

art 3

70S

Prov

ides

def

initi

ons

of te

rms

and

gene

ral

inst

ruct

ions

for t

he P

art 3

70 s

erie

s of

ha

zard

ous

was

te m

anag

emen

t.

Appl

icab

le w

here

haz

ardo

us w

aste

is to

be

man

aged

.

Haz

ardo

us W

aste

M

anife

st S

yste

m a

nd

Rel

ated

Sta

ndar

ds

for G

ener

ator

s,

Tran

spor

ters

, and

Fa

cilit

ies

6 N

YCR

R P

art 3

72S

Prov

ides

gui

delin

es re

latin

g to

the

use

of

the

man

ifest

sys

tem

and

its

reco

rdke

epin

g re

quire

men

ts. I

t app

lies

to

gene

rato

rs, t

rans

porte

rs a

nd fa

cilit

ies

in

New

Yor

k St

ate.

This

regu

latio

n is

appl

icab

le to

any

com

pany

(s)

cont

ract

ed to

do

treat

men

t wor

k or

to tr

ansp

ort o

r m

anag

e ha

zard

ous

mat

eria

l gen

erat

ed.

New

Yor

k R

egul

atio

ns fo

r Tr

ansp

orta

tion

of

Haz

ardo

us W

aste

6 N

YCR

R P

art 3

72.3

a-

dS

Out

lines

pro

cedu

res

for t

he p

acka

ging

, la

belin

g, m

anife

stin

g an

d tra

nspo

rting

of

haza

rdou

s w

aste

.

Thes

e re

quire

men

ts a

reap

plic

able

to a

ny

com

pany

(s) c

ontra

cted

to tr

ansp

ort h

azar

dous

m

ater

ial.

Was

te T

rans

port

er

Perm

its6

NYC

RR

Par

t 364

SG

over

ns th

e co

llect

ion,

tran

spor

t and

de

liver

y of

regu

late

d w

aste

with

in N

ew

York

Sta

te.

Thes

e re

quire

men

ts a

reap

plic

able

to a

ny

com

pany

(s) c

ontra

cted

to tr

ansp

ort h

azar

dous

m

ater

ial.

NYS

DEC

Tec

hnic

al

and

Adm

inis

trat

ive

Gui

danc

eM

emor

andu

ms

(TA

GM

s)

NYS

DEC

TAG

Ms

GTA

GM

s ar

e N

YSD

EC g

uida

nce

that

are

to

be c

onsi

dere

d du

ring

the

rem

edia

l pr

oces

s.

Appr

opria

te T

AGM

s w

ill be

con

side

red

durin

g th

e re

med

ial p

roce

ss.

Tabl

e4-

1.Po

tent

ial C

hem

ical

-, A

ctio

n-, a

nd L

ocat

ion-

Spec

ific

Stan

dard

s, C

riter

ia, a

nd G

uide

lines

(SC

Gs)

Stud

y A

rea

Feas

ibili

ty S

tudy

, Nor

thro

p G

rum

man

Sys

tem

s C

orpo

ratio

nO

pera

ble

Uni

t 3 (F

orm

er G

rum

man

Set

tling

Pon

ds),

Bet

hpag

e, N

ew Y

ork.

4/8/

2011

g:\a

proj

ect\n

orth

rop

grum

man

\sup

erfu

nd\2

011\

ou3\

ny00

1496

.081

1 ri

fs\re

vise

d st

udy

area

fs\fi

nal r

epor

t\tab

les\t

able

4-1

.doc

Page

7of

8

Reg

ulat

ion

Cita

tion

Pote

ntia

lSt

anda

rd (S

) or

Gui

danc

e (G

)Su

mm

ary

of R

equi

rem

ents

App

licab

ility

to th

e R

emed

ial D

esig

n/R

emed

ialA

ctio

n

New

Yor

k R

egul

atio

ns fo

r H

azar

dous

Was

te

Man

agem

ent

Faci

litie

s

6 N

YCR

R P

art

373.

1.1

-373

.1.8

SPr

ovid

es re

quire

men

ts a

nd p

roce

dure

s fo

r ob

tain

ing

a pe

rmit

to o

pera

te a

haz

ardo

us

was

te tr

eatm

ent,

stor

age

and

disp

osal

fa

cilit

y. A

lso

lists

con

tent

s an

d co

nditi

ons

of p

erm

its.

Thes

e re

quire

men

ts a

reap

plic

able

to a

ny o

ff-si

tefa

cilit

y ac

cept

ing

was

te.

Land

Dis

posa

l of a

H

azar

dous

Was

te6

NYC

RR

Par

t 376

SR

estri

cts

land

dis

posa

l of h

azar

dous

w

aste

s th

at e

xcee

d sp

ecifi

c cr

iteria

.N

ew Y

ork

defe

rs to

USE

PA fo

r UTS

/LD

Rre

gula

tions

.N

atio

nal P

ollu

tant

D

isch

arge

Elim

inat

ion

Syst

em

(NPD

ES) P

rogr

am

Req

uire

men

ts,

Adm

inis

tere

d U

nder

N

ew Y

ork

Stat

e Po

llutio

n D

isch

arge

El

imin

atio

n Sy

stem

(S

PDES

)

40 C

FR P

arts

122

Su

bpar

t B, 1

25, 3

01,

303,

and

307

(Adm

inis

tere

d un

der

6 N

YCR

R75

0-75

8)

SEs

tabl

ishe

s pe

rmitt

ing

requ

irem

ents

for

poin

t sou

rce

disc

harg

es; r

egul

ates

di

scha

rge

of w

ater

into

nav

igab

le w

ater

s in

clud

ing

the

quan

tity

and

qual

ity o

f di

scha

rge.

Appl

icab

le to

rem

edia

l act

iviti

es th

at in

volv

etre

atm

ent/d

ispo

sal o

f wat

er.

Tabl

e4-

1.Po

tent

ial C

hem

ical

-, A

ctio

n-, a

nd L

ocat

ion-

Spec

ific

Stan

dard

s, C

riter

ia, a

nd G

uide

lines

(SC

Gs)

Stud

y A

rea

Feas

ibili

ty S

tudy

, Nor

thro

p G

rum

man

Sys

tem

s C

orpo

ratio

nO

pera

ble

Uni

t 3 (F

orm

er G

rum

man

Set

tling

Pon

ds),

Bet

hpag

e, N

ew Y

ork.

4/8/

2011

g:\a

proj

ect\n

orth

rop

grum

man

\sup

erfu

nd\2

011\

ou3\

ny00

1496

.081

1 ri

fs\re

vise

d st

udy

area

fs\fi

nal r

epor

t\tab

les\t

able

4-1

.doc

Page

8of

8

Reg

ulat

ion

Cita

tion

Pote

ntia

lSt

anda

rd (S

) or

Gui

danc

e (G

)Su

mm

ary

of R

equi

rem

ents

App

licab

ility

to th

e R

emed

ial D

esig

n/R

emed

ialA

ctio

n

NYS

DEC

Div

isio

n of

En

viro

nmen

tal

Rem

edia

tion

(DER

) N

umbe

red

Tech

nica

l G

uida

nce

Serie

s D

ocum

ents

DER

-10

(Tec

hnic

al

Gui

danc

e fo

r Site

In

vest

igat

ion

and

Rem

edia

tion)

, DER

-15

Pre

sum

ptiv

e/

Prov

en R

emed

ial

Tech

nolo

gies

,and

othe

r app

licab

le

docu

men

ts

GD

ER-1

0: P

rovi

des

guid

ance

on

NYS

DEC

-ac

cept

ed s

ite in

vest

igat

ion

and

rem

edia

tion

proc

esse

s.

DER

-15:

Prov

ides

brie

f des

crip

tions

of

gene

rally

acc

epte

d pr

esum

ptiv

e/pr

oven

re

med

ial t

echn

olog

ies.

Appl

icab

le to

rem

edy

eval

uatio

n pr

oces

s an

d si

te

rem

edia

l act

iviti

es.

Pote

ntia

l Loc

atio

n-Sp

ecifi

c SC

Gs

New

Yor

k Pr

eser

vatio

n of

H

isto

ric S

truc

ture

s or

A

rtifa

cts

Sect

ion

14.0

9Ap

plic

able

Req

uire

men

ts fo

r pre

serv

atio

n of

hi

stor

ical

/arc

heol

ogic

al a

rtifa

cts.

Activ

ities

mus

t be

done

to id

entif

y, p

rese

rve,

and

re

cove

r arti

fact

s if

the

site

has

bee

n id

entif

ied

as

cont

aini

ng s

igni

fican

t his

toric

al a

rtifa

cts.

Loca

l Bui

ldin

g Pe

rmits

N/A

SLo

cal a

utho

ritie

s m

ay re

quire

a b

uild

ing

perm

it fo

r any

per

man

ent o

r sem

i-pe

rman

ent s

truct

ure,

suc

h as

an

on-s

itew

ater

trea

tmen

t sys

tem

bui

ldin

g.

Subs

tant

ive

prov

isio

ns a

re p

oten

tially

app

licab

le to

re

med

ial a

ctiv

ities

that

requ

ire c

onst

ruct

ion

of

perm

anen

t or s

emi-p

erm

anen

t stru

ctur

es.

DEF

INIT

ION

S:C

FRC

ode

of F

eder

al R

egul

atio

nsU

TSU

nive

rsal

Tre

atm

ent S

tand

ards

EPA

US

Envi

ronm

enta

l Pro

tect

ion

Agen

cyLD

RLa

nd D

ispo

sal R

estri

ctio

nsN

YCR

RO

ffici

al C

ompi

latio

n of

New

Yor

k C

ode,

Rul

es a

nd R

egul

atio

nsN

/AN

ot A

pplic

able

NYS

DEC

New

Yor

k St

ate

Dep

artm

ent o

f Env

ironm

enta

l Con

serv

atio

nD

ERN

YSD

EC D

ivis

ion

of E

nviro

nmen

tal R

emed

iatio

nP

OTW

Publ

icly

-Ow

ned

Trea

tmen

t Wor

ksTA

GM

sN

YSD

EC T

echn

ical

and

Adm

inis

trativ

e G

uida

nce

Mem

oran

dum

sN

YSN

ew Y

ork

Stat

eD

AR-1

NYS

DEC

Div

isio

n of

Air

Res

ourc

esG

uide

lines

for t

he C

ontro

l of

Toxi

c Am

bien

t Air

Con

tam

inan

tsU

S D

OT

Uni

ted

Stat

ed D

epar

tmen

t of T

rans

porta

tion

NPL

Nat

iona

l Prio

ritie

s Li

st

Pag

e 1

of 3

Tabl

e 5-

1.Sc

reen

ing

of R

emed

ial T

echn

olog

ies

Stud

y Ar

eaFe

asib

ility

Stu

dy, N

orth

rop

Gru

mm

an S

yste

ms

Cor

pora

tion

Ope

rabl

e U

nit 3

(For

mer

Gru

mm

an S

ettli

ng P

onds

), B

ethp

age,

New

Yor

k.

Rem

edia

l Tec

hnol

ogy

Type

Proc

ess

Opt

ions

Tech

nolo

gy D

escr

iptio

nEf

fect

iven

ess

Impl

emen

tabi

lity

Rel

ativ

eC

ost

Ret

aine

d fo

r D

etai

led

Eval

uatio

n?

Bas

ed o

n pr

evio

us

regu

lato

ryac

tions

, sev

eral

gr

ound

wat

erte

chno

logi

es/re

med

ial

actio

ns a

re a

lread

yin

pla

ce

and

will

cont

inue

to o

pera

te.

Bas

ed o

n pr

evio

us

regu

lato

ryac

tions

, sev

eral

gr

ound

wat

erte

chno

logi

es/re

med

ial

actio

ns a

re a

lread

yin

plac

e an

d w

ill co

ntin

ue to

op

erat

e.

Bas

ed o

n pr

evio

us re

gula

tory

actio

ns,

the

follo

win

g gr

ound

wat

er

tech

nolo

gies

/rem

edia

l act

ions

are

al

read

yin

pla

ce a

nd w

ill co

ntin

ue to

op

erat

e:• S

ite IR

M &

Mai

n Fa

cilit

yR

emed

ial

Syst

ems.

• Wel

lhea

d tre

atm

ent a

t BW

D s

uppl

yw

ells

.• G

M-3

8 A

rea

Rem

edia

l Sys

tem

.

Effe

ctiv

e- E

xist

ing

tech

nolo

gies

/rem

edia

l ac

tions

are

cur

rent

lym

eetin

g th

eir

resp

ectiv

e R

AO

s an

d op

erat

ing

as

desi

gned

.

Impl

emen

tabl

e- A

lread

yIm

plem

ente

d

Hig

hYe

s

Gro

undw

ater

Ext

ract

ion

Ext

ract

ion

Wel

ls

Gro

undw

ater

pum

ped

from

ver

tical

ex

tract

ion

wel

ls a

nd c

onve

yed

to e

x-si

tu tr

eatm

ent s

yste

m.

Effe

ctiv

e- C

onve

ntio

nal t

echn

olog

yto

cont

rol m

igra

tion

of, a

nd e

xtra

ct,

cont

amin

ated

gro

undw

ater

from

the

aqui

fer.

Can

ach

ieve

RA

Os.

NY

SD

EC

pre

sum

ptiv

e re

med

yfo

r vol

atile

org

anic

com

poun

ds

(VO

Cs)

per

DE

R-1

5.

Impl

emen

tabl

e- R

eadi

lyim

plem

enta

ble,

conv

entio

nal,

prov

en te

chno

logy

in u

se a

t oth

er

area

rem

edia

l act

ions

. R

equi

res

mon

itorin

g pr

ogra

m to

con

firm

effe

ctiv

enes

s.M

oder

ate

Yes

Ex-

Situ

Gro

undw

ater

Tr

eatm

ent

Air

Stri

ppin

gP

acke

d to

wer

or t

ray

strip

per

phys

ical

lyst

rips

VO

Cs

from

wat

er.

Effe

ctiv

e- C

onve

ntio

nal t

echn

olog

yto

trea

t V

OC

sin

ext

ract

ed g

roun

dwat

er.

NY

SD

EC

pr

esum

ptiv

e re

med

yfo

r VO

Cs

per D

ER

-15.

Impl

emen

tabl

e- R

eadi

lyim

plem

enta

ble,

conv

entio

nal,

prov

en te

chno

logy

in u

se a

t oth

er

area

rem

edia

l act

ions

. M

ayre

quire

air

strip

per o

ff-ga

s tre

atm

ent t

o ac

hiev

e S

CG

s. R

equi

res

mon

itorin

g pr

ogra

m to

con

firm

com

plia

nce

with

S

CG

s.

Low

to

Mod

erat

eYe

s

Che

mic

al/U

V O

xida

tion

Che

mic

al o

xida

nts

used

with

or

with

out u

ltrav

iole

t (U

V) li

ght a

ctiv

atio

n to

dev

elop

stro

ng o

xida

nts

that

bre

ak

dow

n or

gani

c co

mpo

unds

into

non

-to

xic

com

poun

ds.

Effe

ctiv

e- C

onve

ntio

nal t

echn

olog

yfo

rtre

atin

g V

OC

s in

ext

ract

ed g

roun

dwat

er.

Cap

able

of a

chie

ving

SC

Gs

in tr

eate

d w

ater

. N

YSD

EC p

resu

mpt

ive

rem

edy

for

VO

Cs

per D

ER

-15.

Impl

emen

tabl

e- R

eadi

lyim

plem

enta

ble,

conv

entio

nal,

prov

en te

chno

logy

. S

ite-s

peci

fic

appl

icat

ion

requ

ires

use

of U

V li

ght a

ctiv

atio

n re

sulti

ng in

a s

igni

fican

t ene

rgy

dem

and

and

asso

ciat

ed u

tility

cost

.

Ver

yH

igh

No

Ads

orpt

ion

Liqu

id p

hase

gra

nula

r act

ivat

ed c

arbo

n (L

PG

AC

) use

d to

rem

ove

VO

Cs

from

gr

ound

wat

er.

Effe

ctiv

e- C

onve

ntio

nal t

echn

olog

yfo

rtre

atin

g V

OC

s in

ext

ract

ed g

roun

dwat

er.

Cap

able

of a

chie

ving

SC

Gs

in tr

eate

d w

ater

. NYS

DEC

pre

sum

ptiv

e re

med

yfo

rV

OC

s pe

r DE

R-1

5.

Impl

emen

tabl

e- R

eadi

lyim

plem

enta

ble,

conv

entio

nal t

echn

olog

y. G

ener

ates

larg

e vo

lum

e of

spe

nt G

AC

requ

iring

man

agem

ent a

nd/o

r re-

gene

ratio

n.

Hig

hN

o

Col

lect

ion/

Trea

tmen

t/D

isch

arge

Bas

elin

e/C

ontin

ued

Actio

n

Gen

eral

Res

pons

e Ac

tion

G:\A

PR

OJE

CT\

Nor

thro

p G

rum

man

\Sup

erfu

nd\2

011\

OU

3\N

Y00

1496

.081

1 R

I FS

\Rev

ised

Stu

dy A

rea

FS\F

inal

Rep

ort\T

able

s\Ta

ble

5-1.

xls

Pag

e 2

of 3

Tabl

e 5-

1.Sc

reen

ing

of R

emed

ial T

echn

olog

ies

Stud

y Ar

eaFe

asib

ility

Stu

dy, N

orth

rop

Gru

mm

an S

yste

ms

Cor

pora

tion

Ope

rabl

e U

nit 3

(For

mer

Gru

mm

an S

ettli

ng P

onds

), B

ethp

age,

New

Yor

k.

Rem

edia

l Tec

hnol

ogy

Type

Proc

ess

Opt

ions

Tech

nolo

gy D

escr

iptio

nEf

fect

iven

ess

Impl

emen

tabi

lity

Rel

ativ

eC

ost

Ret

aine

d fo

r D

etai

led

Eval

uatio

n?

Gen

eral

Res

pons

e Ac

tion

Rec

harg

e B

asin

Rec

harg

e ba

sin

rech

arge

s tre

ated

gr

ound

wat

er b

ack

into

aqu

ifer.

Effe

ctiv

e- C

onve

ntio

nal t

echn

olog

yto

rech

arge

trea

ted

grou

ndw

ater

bac

k to

the

aqui

fer.

Impl

emen

tabl

e- R

eadi

lyim

plem

enta

ble,

conv

entio

nal,

prov

en te

chno

logy

in u

se a

t oth

er

area

rem

edia

l act

ions

. R

equi

res

addi

tiona

l tre

atm

ent a

nd O

M&

M, i

f sig

nific

ant i

ron

is p

rese

nt

in th

e gr

ound

wat

er.

Low

to

Mod

erat

eYe

s

Inje

ctio

n W

ells

Inje

ctio

n w

ells

rech

arge

trea

ted

grou

ndw

ater

bac

k in

to a

quife

r.Ef

fect

ive

- Con

vent

iona

l tec

hnol

ogy

tore

char

ge tr

eate

d gr

ound

wat

er b

ack

to th

e aq

uife

r.

Impl

emen

tabl

e- R

eadi

lyim

plem

enta

ble,

conv

entio

nal,

prov

en te

chno

logy

in u

se a

t oth

er

area

rem

edia

l act

ions

. May

requ

ire s

igni

fican

t ad

ditio

nal t

reat

men

t and

OM

&M

com

pare

d to

re

char

ge b

asin

s.M

oder

ate

to H

igh

Yes

In-S

itu C

hem

ical

O

xida

tion

(ISC

O)

Che

mic

al o

xida

nt in

ject

ed in

to

grou

ndw

ater

to b

reak

dow

n V

OC

s in

to

non-

toxi

c co

mpo

unds

.

Effe

ctiv

e- C

onve

ntio

nal t

echn

olog

yto

trea

t V

OC

s in

gro

undw

ater

. C

an a

chie

ve R

AO

s.N

YS

DE

C p

resu

mpt

ive

rem

edy

for V

OC

s pe

r DE

R-1

5.

Impl

emen

tabl

e- D

iffic

ult t

o im

plem

ent.

Req

uire

s nu

mer

ous

deep

inje

ctio

n an

d m

onito

ring

wel

ls.

Req

uire

s a

sign

ifica

nt v

olum

e of

oxi

dant

for

mai

nten

ance

inje

ctio

ns d

ue to

the

size

and

dep

th

of th

e tre

atm

ent z

one

and

rela

tivel

yhi

ghgr

ound

wat

er fl

ow ra

te.

Req

uire

s st

orag

e, h

andl

ing,

an

d tra

nsfe

r of h

azar

dous

mat

eria

ls in

resi

dent

ial

area

s. A

cces

s to

con

stru

ct t

he re

med

ial w

ells

and

in

frast

ruct

ure

will

likel

yno

t be

obta

inab

le in

the

prim

arily

resi

dent

ial a

rea.

Ver

yH

igh

No

Air

Spa

rgin

gA

ir is

inje

cted

into

gro

undw

ater

en

ablin

g th

e tra

nsfe

r of d

isso

lved

ph

ase

VO

Cs

into

the

vapo

r pha

se.

Vola

tiliz

ed V

OC

s ar

e ca

ptur

ed b

ya

vapo

r ext

ract

ion

syst

em fo

r tre

atm

ent

prio

r to

disc

harg

e to

the

atm

osph

ere.

Not

Effe

ctiv

e - N

YS

DE

C p

resu

mpt

ive

rem

edy

for V

OC

s pe

r DE

R-1

5; h

owev

er,

tech

nolo

gyis

inef

fect

ive

in s

atur

ated

zon

es

grea

ter t

han

50 fe

et th

ick

(DE

R-1

5).

Will

not a

chie

ve R

AO

s.

Not

Impl

emen

tabl

e- N

ot im

plem

enta

ble

at th

e ta

rget

trea

tmen

t dep

ths

(>50

0 fe

et ).

Lik

ely

wou

ldge

nera

te u

ncon

trolle

d V

OC

vap

ors

in s

ubsu

rface

so

ils.

Ver

yH

igh

No

Col

lect

ion/

Trea

tmen

t/D

isch

arge

(Con

tinue

d)In

-Situ

Gro

undw

ater

Tr

eatm

ent

Trea

ted

Gro

undw

ater

D

isch

arge

G:\A

PR

OJE

CT\

Nor

thro

p G

rum

man

\Sup

erfu

nd\2

011\

OU

3\N

Y00

1496

.081

1 R

I FS

\Rev

ised

Stu

dy A

rea

FS\F

inal

Rep

ort\T

able

s\Ta

ble

5-1.

xls

Pag

e 3

of 3

Tabl

e 5-

1.Sc

reen

ing

of R

emed

ial T

echn

olog

ies

Stud

y Ar

eaFe

asib

ility

Stu

dy, N

orth

rop

Gru

mm

an S

yste

ms

Cor

pora

tion

Ope

rabl

e U

nit 3

(For

mer

Gru

mm

an S

ettli

ng P

onds

), B

ethp

age,

New

Yor

k.

Rem

edia

l Tec

hnol

ogy

Type

Proc

ess

Opt

ions

Tech

nolo

gy D

escr

iptio

nEf

fect

iven

ess

Impl

emen

tabi

lity

Rel

ativ

eC

ost

Ret

aine

d fo

r D

etai

led

Eval

uatio

n?

Gen

eral

Res

pons

e Ac

tion

In-W

ell A

ir S

tripp

ing

In-w

ell a

ir st

rippi

ng s

yste

m th

at u

ses

air l

ift p

umpi

ng to

vol

atili

ze V

OC

s fro

m

grou

ndw

ater

to th

e va

por p

hase

.Pu

mpe

d/pa

rtial

lytre

ated

wat

er is

di

scha

rged

to a

n up

per s

cree

n in

terv

al

whe

re a

por

tion

is re

circ

ulat

ed to

the

low

er s

cree

n, a

s re

quire

d, to

mee

t S

CG

s fo

r gro

undw

ater

. O

ff-ga

s is

co

llect

ed a

nd tr

eate

d th

roug

h a

varie

tyof

treat

men

t met

hods

.

Effe

ctiv

e- C

onve

ntio

nal t

echn

olog

yto

trea

t V

OC

s in

gro

undw

ater

. C

an a

chie

ve R

AO

s.N

YS

DE

C p

resu

mpt

ive

rem

edy

for V

OC

s pe

r DE

R-1

5.

Not

Impl

emen

tabl

e -R

equi

res

num

erou

s re

med

ial w

ells

and

ass

ocia

ted

infra

stru

ctur

e du

e to

th

e si

gnifi

cant

trea

tmen

t dep

ths,

requ

ired

wid

th o

f th

e tre

atm

ent z

one,

and

rela

tivel

yhi

gh g

roun

dwat

er

flow

rate

. A

cces

s to

con

stru

ct th

e re

med

ial w

ells

an

d in

frast

ruct

ure

likel

yno

t obt

aina

ble

in th

e pr

imar

ilyre

side

ntia

l are

a.V

ery

Hig

hN

o

Enh

ance

d B

iode

grad

atio

nO

rgan

ic s

ubst

rate

inje

cted

into

gr

ound

wat

er to

stim

ulat

e ex

istin

g m

icro

bial

com

mun

ities

that

deg

rade

V

OC

s th

roug

h re

duct

ive

dech

lorin

atio

n.

Effe

ctiv

e- C

onve

ntio

nal t

echn

olog

yto

trea

t V

OC

s in

gro

undw

ater

. C

an a

chie

ve R

AO

s.N

YS

DE

C p

resu

mpt

ive

rem

edy

for V

OC

s pe

r DE

R-1

5.

Impl

emen

tabl

e- D

iffic

ult t

o im

plem

ent.

Req

uire

s nu

mer

ous

deep

inje

ctio

n an

d m

onito

ring

wel

ls to

be

inst

alle

d. R

equi

res

a la

rge

volu

me

of o

rgan

ic

carb

on fo

r mai

nten

ance

inje

ctio

ns d

ue to

the

size

an

d de

pth

of th

e tre

atm

ent z

one

and

rela

tivel

yhi

gh g

roun

dwat

er fl

ow ra

te.

Cou

ld p

rodu

ce to

xic

VO

C d

augh

ter c

ompo

unds

suc

h as

vin

yl c

hlor

ide.

A

cces

s to

con

stru

ct t

he re

med

ial w

ells

and

in

frast

ruct

ure

will

likel

yno

t be

obta

inab

le in

the

prim

arily

resi

dent

ial a

rea.

Hig

hN

o

Nat

ural

Atte

nuat

ion

Nat

ural

lyoc

curri

ng p

roce

sses

(e.g

., di

lutio

n, d

ispe

rsio

n, s

orpt

ion,

bi

odeg

rada

tion)

use

d fo

llow

ing

activ

e re

med

iatio

nto

atte

nuat

e lo

w

conc

entra

tions

of c

onta

min

ants

.

Effe

ctiv

e- S

ite-re

late

d gr

ound

wat

er

cont

amin

ants

trea

tabl

e by

natu

ral

atte

nuat

ion

proc

esse

s. C

an a

chie

ve R

AO

s w

hen

used

in c

onju

nctio

n w

ith, o

r fol

low

ing

use

of a

ctiv

e re

med

ial a

ctio

ns.

Impl

emen

tabl

e- R

eadi

lyim

plem

enta

ble;

no

cons

truct

ion

requ

ired,

exc

ept f

or a

dditi

onal

m

onito

ring

wel

l ins

talla

tion.

Low

Yes

DEF

INIT

ION

S:B

WD

Bet

hpag

e W

ater

Dis

trict

Site

IRM

Inte

rim R

emed

ial M

easu

re (p

ump

& tr

eat s

yste

m) l

ocat

ed s

outh

of B

ethp

age

Com

mun

ityP

ark

Mai

n Fa

cilit

yN

orth

rop

Gru

mm

an M

ain

Faci

lity,

use

d to

refe

rred

to c

urre

nt re

med

ial s

yste

ms

asso

ciat

ed w

ith O

U2

(Tow

er 9

6 an

d To

wer

102

)G

M-3

8A

rea

whe

re p

ump-

and-

treat

sys

tem

rece

ntly

inst

alle

d b

yth

e N

avy.

RA

Os

Rem

edia

l Act

ion

Obj

ectiv

esN

YSD

ECN

ew Y

ork

Sta

te D

epar

tmen

t of E

nviro

nmen

tal C

onse

rvat

ion

DE

R-1

5N

YS

DE

C D

ivis

ion

of E

nviro

nmen

tal R

emed

iatio

n’s

Pre

sum

ptiv

e /P

rove

n R

emed

ial T

echn

olog

ies

Pol

icy

(dat

ed F

ebru

ary

27, 2

007)

OM

&M

Ope

ratio

n M

aint

enan

ce a

nd M

onito

ring

SC

Gs

Sta

ndar

ds, C

riter

ia, a

nd G

uida

nce

Col

lect

ion/

Trea

tmen

t/D

isch

arge

(Con

tinue

d)

In-S

itu G

roun

dwat

er

Trea

tmen

t (C

ontin

ued)

G:\A

PR

OJE

CT\

Nor

thro

p G

rum

man

\Sup

erfu

nd\2

011\

OU

3\N

Y00

1496

.081

1 R

I FS

\Rev

ised

Stu

dy A

rea

FS\F

inal

Rep

ort\T

able

s\Ta

ble

5-1.

xls

Table 6-1. Evaluation Criteria for Remedial AlternativesStudy Area Feasibility Study, Northrop Grumman Systems CorporationOperable Unit 3 (Former Grumman Settling Ponds), Bethpage, New York.

Overall Protectiveness of Public Health and the Environment

Ability to protect public health and the environment, assessing how risks posed by existing and potential exposure pathways are eliminated or reduced, through removal, treatment, engineering controls, or institutional controls.Ability to achieve the RAOs is also evaluated.

Standards, Criteria, & Guidance (SCGs)

Ability to meet requirements of environmental laws, regulations, standards and guidance. If one or more SCGs are not met upon implementation of a remedial alternative, evaluation of whether a waiver is required is provided.

Long Term Effectiveness & Permanence

If wastes or residuals will remain at the site after implementation, then the following are evaluated: (1) the magnitude and nature of the residual risks posed by the remaining wastes; (2) the adequacy of the controls intended to limit the risks; (3) the reliability of these controls; and (4) the ability of the remedy to continue to meet the RAOs in the future.

Reduction of Toxicity, Mobility, or Volume with Treatment

Ability of an alternative to permanently and significantly reduce toxicity, mobilityor volume of the wastes.

Short-Term Impacts and Effectiveness

Potential short-term impacts of a remedial action upon the community, the site workers, and the environment.The period of time required to achieve RAOs is estimated.

Implementability The technical and administrative feasibility of implementing a remedial alternative. For technical feasibility, the difficulties associated with the construction and operation of the alternative and the ability to monitor the effectiveness of the remedy are evaluated. For administrative feasibility, the availability of the necessary personnel and material is evaluated, along with the difficulties in obtaining permits, rights-of-way, and site access.

Sustainability The NYSDEC encourages the use of best management practices for sustainable remediation at contaminated sites. Sustainable practices result in cleanups that minimize the environmental and energy "footprints" of remedial actions taken during a project's duration. Examples of sustainable practices include reducing energy demands, minimizing waste generation, and minimizing land use and building footprints.

Cost Effectiveness Capital costs and O&M costs are estimated on a present worth basis.Although cost is the last criterion evaluated, where two or more alternatives have satisfied the other evaluation criteria, cost effectiveness should be used as the basis for final remedy selection.

DEFINITIONS:

RAOs Remedial Action ObjectivesO&M Operation & MaintenanceNYSDEC New York State Department of Environmental Conservation.

Evaluation Criteria Criteria Definition

G:\APROJECT\Northrop Grumman\Superfund\2011\OU3\NY001496.0811 RI FS\Revised Study Area FS\Final Report\Tables\Table 6-1.xls

Pag

e 1

of 3

Tabl

e 6-

2.D

etai

led

Eval

uatio

n of

Rem

edia

l Alte

rnat

ives

Stud

y Ar

ea F

easi

bilit

y St

udy,

Nor

thro

p G

rum

man

Sys

tem

s C

orpo

ratio

nO

pera

ble

Uni

t 3 (F

orm

er G

rum

man

Set

tling

Pon

ds),

Bet

hpag

e, N

ew Y

ork.

Alte

rnat

ive

1Al

tern

ativ

e 2

Alte

rnat

ive

3Al

tern

ativ

e 4

Alte

rnat

ive

5Al

tern

ativ

e 6

No

Actio

n.• S

hut d

own

all c

urre

nt g

roun

dwat

er

rem

edia

l sys

tem

s.

• Shu

t dow

n al

l pub

lic s

uppl

y w

ellh

ead

prot

ectio

n sy

stem

s.

Bas

elin

e C

ondi

tions

/Con

tinue

d Ac

tion.

• Con

duct

VO

C s

ourc

e re

med

iatio

n at

the

Site

.• C

ontin

ue to

ope

rate

the

follo

win

g re

med

ial/t

reat

men

t sys

tem

s to

pro

tect

wat

er

supp

ly w

ells

and

redu

ce V

OC

mas

s in

the

Stud

y Ar

ea (S

ee F

igur

e 6-

1):

- Exi

stin

g B

WD

wel

lhea

d pr

otec

tion

syst

ems.

- Site

IRM

(4 w

ells

; tot

al 2

10 G

PM).

- Mai

n Fa

cilit

y re

med

ial s

yste

ms,

incl

udin

g To

wer

96

(2 w

ells

; tot

al 1

,500

GPM

) and

To

wer

102

(3 w

ells

; tot

al 2

,300

GPM

). - G

M-3

8 Ar

ea (t

wo

wel

ls; t

otal

1,1

00 G

PM).

• Con

duct

cur

rent

mon

itorin

g.

Alte

rnat

ive

2, P

lus

One

New

Rem

edia

l Wel

l (W

ell R

W-2

1).

• Ins

tall

and

oper

ate

one

new

rem

edia

l wel

l (W

ell R

W-2

1) p

umpi

ng a

t 1,0

00 g

pm to

re

duce

VO

C m

ass

in S

tudy

Are

a gr

ound

wat

er

(See

Fig

ure

6-2)

.•T

reat

ext

ract

ed g

roun

dwat

er fr

om th

e ne

w

wel

l at t

he e

xist

ing

Mai

n Fa

cilit

y re

med

ial

syst

em (T

ower

102

- fo

ur w

ells

tota

l - 2

,800

G

PM).

• Dis

char

ge tr

eate

d w

ater

to N

orth

rop

Gru

mm

an S

outh

Bas

ins.

• Con

duct

exp

ande

d m

onito

ring.

Alte

rnat

ive

2, P

lus

Two

New

Rem

edia

l Wel

ls

(RW

-20

and

RW

-21)

.• I

nsta

ll an

d op

erat

e tw

o ne

w re

med

ial w

ells

(W

ell R

W-2

0 pu

mpi

ng a

t 500

gpm

and

Wel

l R

W-2

1 pu

mpi

ng a

t 500

gpm

) to

redu

ce V

OC

m

ass

in S

tudy

Are

a gr

ound

wat

er (S

ee F

igur

e 6-

3).

• Tre

at e

xtra

cted

gro

undw

ater

from

new

wel

ls

at th

e ex

istin

g M

ain

Faci

lity

rem

edia

l sys

tem

(T

ower

102

- 5

wel

ls to

tal -

2,8

00 G

PM).

• Dis

char

ge tr

eate

d w

ater

to th

e So

uth

Bas

ins.

• Con

duct

exp

ande

d m

onito

ring.

Alte

rnat

ive

2, P

lus

Ope

rate

BW

D P

lant

4 a

s R

emed

iatio

n Sy

stem

, plu

s O

ne N

ew R

emed

ial

Wel

l (R

W-2

0), p

lus

Rep

lace

BW

D P

lant

4

Cap

acity

.• I

nsta

ll an

d op

erat

e on

e ne

w re

med

ial w

ell

(Wel

l RW

-20

pum

ping

at 5

00 g

pm),

and

oper

ate

the

two

exis

ting

BW

D P

lant

4 w

ells

, pu

mpi

ng a

tota

l of 2

,700

GPM

, to

redu

ce V

OC

m

ass

in S

tudy

Are

a gr

ound

wat

er (S

ee F

igur

e 6-

4).

• Tre

at e

xtra

cted

gro

undw

ater

from

the

new

w

ell a

t the

exi

stin

g M

ain

Faci

lity

rem

edia

l sy

stem

(Tow

er 1

02 -

4 re

med

ial w

ells

- 2,

300

GPM

).• D

isch

arge

trea

ted

wat

er to

the

Sout

h B

asin

s.• D

isch

arge

trea

ted

wat

er fr

om B

WD

Pla

nt 4

to c

ombi

natio

n of

the

Arth

ur A

venu

e re

char

ge

basi

n an

d 3

new

sha

llow

inje

ctio

n w

ells

lo

cate

d ne

ar th

e ba

sin.

• Con

duct

exp

ande

d m

onito

ring.

Alte

rnat

ive

2, P

lus

Five

New

Rem

edia

l Wel

ls

(RW

-22

to -2

6).

• Ins

tall

and

oper

ate

5 ne

w re

med

ial w

ells

(RW

-22

to -2

6, p

umpi

ng a

tota

l of 4

,040

gpm

) and

5

new

trea

tmen

t sys

tem

s to

atte

mpt

retu

rnin

g St

udy

Area

gro

undw

ater

to p

re-d

ispo

sal

cond

ition

s (S

ee F

igur

e 6-

5).

• Dis

char

ge tr

eate

d w

ater

to 7

new

inje

ctio

n w

ells

(14

wel

ls to

tal:

7 op

erat

ing,

plu

s 7

back

up).

• Con

duct

exp

ande

d m

onito

ring.

Not

pro

tect

ive

of p

ublic

hea

th o

r the

en

viro

nmen

t.P

rote

ctiv

e of

pub

lic h

ealth

and

the

envi

ronm

ent.

BW

D w

ater

sup

plie

s tre

ated

to le

ss th

an th

e dr

inki

ng w

ater

sta

ndar

ds, t

here

fore

, pro

tect

ive

of

publ

ic h

ealth

(5) .

How

ever

, exi

stin

g w

ellh

ead

prot

ectio

n at

BW

D P

lant

5 m

ay n

ot b

e ca

pabl

e of

ac

hiev

ing

the

BW

D tr

eatm

ent g

oal o

f non

-det

ect.

TVO

C m

ass

rem

oved

from

gro

undw

ater

(1

00,0

00 lb

s) p

rote

ctiv

e of

the

envi

ronm

ent.

Sam

e as

Alte

rnat

ive

2 fo

r pro

tect

ion

of p

ublic

he

alth

. Exi

stin

g w

ellh

ead

prot

ectio

n at

BW

D

Plan

t 5 w

ill b

e ca

pabl

e of

ach

ievi

ng th

e B

WD

tr

eatm

ent g

oal o

f non

-det

ect(5

) . Add

ition

al

mas

s re

mov

ed fr

om g

roun

dwat

er u

nder

this

al

tern

ativ

e (3

,000

pou

nds;

see

dis

cuss

ion

belo

w)

rela

tive

to A

ltern

ativ

e 2

prov

ides

add

ition

al

prot

ectio

n of

the

envi

ronm

ent.

Sam

e as

Alte

rnat

ive

2 fo

r pro

tect

ion

of p

ublic

he

alth

. Exi

stin

g w

ellh

ead

prot

ectio

n at

BW

DP

lant

5 w

ill b

e ca

pabl

e of

ach

ievi

ng th

e B

WD

treat

men

t goa

l of n

on-d

etec

t(5) . A

dditi

onal

mas

s re

mov

ed fr

om g

roun

dwat

er u

nder

this

alte

rnat

ive

(7,0

00 p

ound

s; s

ee d

iscu

ssio

n be

low

) rel

ativ

e to

A

ltern

ativ

e 2

prov

ides

add

ition

al p

rote

ctio

n of

the

envi

ronm

ent.

Sam

e as

Alte

rnat

ive

2 fo

r pro

tect

ion

of p

ublic

he

alth

. Exi

stin

g w

ellh

ead

prot

ectio

n at

BW

DP

lant

5 w

ill b

e ca

pabl

e of

ach

ievi

ng th

e B

WD

treat

men

t goa

l of n

on-d

etec

t(5) . A

dditi

onal

mas

s re

mov

ed fr

om g

roun

dwat

er u

nder

this

alte

rnat

ive

(7,5

00 p

ound

s; s

ee d

iscu

ssio

n be

low

) rel

ativ

e to

A

ltern

ativ

e 2

prov

ides

add

ition

al p

rote

ctio

n of

the

envi

ronm

ent.

Mas

s re

mov

al is

sim

ilar t

o A

ltern

ativ

e 4.

Sam

e as

Alte

rnat

ive

2 fo

r pro

tect

ion

of p

ublic

he

alth

. Exi

stin

g w

ellh

ead

prot

ectio

n at

BW

D P

lant

5

will

be

capa

ble

of a

chie

ving

the

BW

D tr

eatm

ent

goal

of n

on-d

etec

t(5) .

Add

ition

al m

ass

rem

oved

fro

m g

roun

dwat

er u

nder

this

alte

rnat

ive

(38,

500

poun

ds; s

ee d

iscu

ssio

n be

low

) rel

ativ

e to

A

ltern

ativ

e 2

prov

ides

add

ition

al p

rote

ctio

n of

the

envi

ronm

ent.

Doe

s no

t mee

t drin

king

wat

er s

tand

ards

for

publ

ic s

uppl

y w

ells

. G

roun

dwat

er S

CG

s w

ill n

ot

be a

chie

ved

in th

e aq

uife

r; w

aive

r req

uire

d.

Pub

lic s

uppl

y w

ell p

rote

ctio

n sy

stem

s tre

at to

le

ss th

an d

rinki

ng w

ater

sta

ndar

ds(5

) . Rem

edia

l sy

stem

s op

erat

ed to

mee

t dis

char

ge S

CG

s.G

roun

dwat

er S

CG

s w

ill n

ot b

e ac

hiev

ed in

the

aqui

fer;

wai

ver r

equi

red.

Sam

e as

Alte

rnat

ive

2.S

ame

as A

ltern

ativ

e 2.

Sam

e as

Alte

rnat

ive

2.S

ame

as A

ltern

ativ

e 2.

Rem

edia

l wel

ls a

nd m

ajor

ity

of a

quife

r in

the

Stu

dy A

rea

mee

t SC

Gs.

Doe

s no

t mee

t RA

Os

and

leav

es s

igni

fican

t ris

k to

the

publ

ic a

nd th

e en

viro

nmen

t.P

rove

n an

d re

liabl

e re

med

ial t

echn

olog

ies

and

asso

ciat

ed c

ontro

ls th

at le

ave

no s

igni

fican

t ris

k to

the

publ

ic o

r the

env

ironm

ent a

nd w

ill c

ontin

ue

to m

eet R

AO

s, w

hen

prop

erly

ope

rate

d,

mai

ntai

ned,

and

mon

itore

d. E

xist

ing

wel

lhea

d pr

otec

tion

at B

WD

Pla

nt 5

may

not

be

capa

ble

of

achi

evin

g th

e B

WD

trea

tmen

t goa

l of n

on-

dete

ct(5

) .

Sam

e as

Alte

rnat

ive

2, e

xcep

t exi

stin

g w

ellh

ead

prot

ectio

n at

BW

D P

lant

5 w

ill b

e ca

pabl

e of

ach

ievi

ng th

e B

WD

trea

tmen

t goa

l of

non

-det

ect(5

) .

Sam

e as

Alte

rnat

ive

2, e

xcep

t exi

stin

g w

ellh

ead

prot

ectio

n at

BW

D P

lant

5 w

ill b

e ca

pabl

e of

ac

hiev

ing

the

BW

D tr

eatm

ent g

oal o

f non

-de

tect

(5) .

Sam

e as

Alte

rnat

ive

2, e

xcep

t exi

stin

g w

ellh

ead

prot

ectio

n at

BW

D P

lant

5 w

ill b

e ca

pabl

e of

ac

hiev

ing

the

BW

D tr

eatm

ent g

oal o

f non

-de

tect

(5) .

Sam

e as

Alte

rnat

ive

2, e

xcep

t exi

stin

g w

ellh

ead

prot

ectio

n at

BW

D P

lant

5 w

ill b

e ca

pabl

e of

ac

hiev

ing

the

BW

D tr

eatm

ent g

oal o

f non

-det

ect(5

) .

No

redu

ctio

n in

toxi

city

, mob

ility

, or v

olum

e of

co

ntam

inat

ion.

Red

uces

mob

ility

and

vol

ume

of V

OC

s in

the

Stu

dy A

rea

grou

ndw

ater

. R

emov

es a

nd tr

eats

(e

limin

ates

toxi

city

) app

roxi

mat

ely

144,

000

(3)

poun

ds o

f VO

Cs

(100

,000

lbs

from

gro

undw

ater

an

d 44

,000

lbs

from

the

Site

Are

a so

urce

are

a)

Red

uces

mob

ility

and

vol

ume

of V

OC

s in

the

Stud

y A

rea

grou

ndw

ater

. R

emov

es a

nd

trea

ts (e

limin

ates

toxi

city

) app

roxi

mat

ely

147,

000

(3)p

ound

s of

VO

Cs

(103

,000

lbs

from

gr

ound

wat

er a

nd 4

4,00

0 lb

s fro

m th

e S

ite A

rea

sour

ce a

rea)

. In

add

ition

, of a

ll th

e al

tern

ativ

es,

Alte

rnat

ive

3 ha

s th

e gr

eate

st c

olle

ctiv

e be

nefic

ial e

ffect

on

BW

D P

lant

s 4

and

5 (i.

e.,

low

est p

eak

VO

C c

once

ntra

tion

and

grea

test

ra

te o

f dec

reas

e in

VO

C c

once

ntra

tions

in th

e w

ells

).

Red

uces

mob

ility

and

vol

ume

of V

OC

s in

the

Stu

dy A

rea

grou

ndw

ater

and

als

o re

mov

es m

ore

mas

s th

an A

ltern

ativ

es 2

and

3.

Rem

oves

and

tre

ats

(elim

inat

es to

xici

ty) a

ppro

xim

atel

y 15

1,00

0 (3

)pou

nds

of V

OC

s (1

07,0

00 lb

s fro

m

grou

ndw

ater

and

44,

000

lbs

from

the

Site

Are

a so

urce

are

a). A

ltern

ativ

e 4

has

less

of a

cu

mul

ativ

e be

nefic

ial e

ffect

on

BW

D P

lant

s 4

and

5 (i.

e., l

owes

t pea

k V

OC

con

cent

ratio

n an

d gr

eate

st ra

te o

f dec

reas

e in

VO

C c

once

ntra

tions

in

the

wel

ls) t

han

Alte

rnat

ive

3.

Red

uces

mob

ility

and

vol

ume

of V

OC

s in

the

Stu

dy A

rea

grou

ndw

ater

and

als

o re

mov

es m

ore

mas

s th

an A

ltern

ativ

es 2

and

3. M

ass

rem

oval

is

sim

ilar t

o A

ltern

ativ

e 4.

Rem

oves

and

trea

ts

(elim

inat

es to

xici

ty) a

ppro

xim

atel

y 15

1,50

0 (3

) po

unds

of V

OC

s (1

07,5

00 lb

s fro

m g

roun

dwat

er

and

44,0

00 lb

s fro

m th

e S

ite A

rea

sour

ce a

rea)

.

Red

uces

mob

ility

and

vol

ume

of V

OC

s in

the

Stu

dy

Are

a gr

ound

wat

er a

nd a

lso

rem

oves

mor

e m

ass

than

oth

er a

ltern

ativ

es. R

emov

es a

nd tr

eats

(e

limin

ates

toxi

city

) app

roxi

mat

ely

182,

500

(3)

poun

ds o

f VO

Cs

(138

,500

lbs

from

gro

undw

ater

an

d 44

,000

lbs

from

the

Site

Are

a so

urce

are

a).

Alte

rnat

ive

6 ha

s le

ss o

f a c

umul

ativ

e be

nefic

ial

effe

ct o

n B

WD

Pla

nts

4 an

d 5

(i.e.

, low

est p

eak

VO

C c

once

ntra

tion

and

grea

test

rate

of d

ecre

ase

in

VO

C c

once

ntra

tions

in th

e w

ells

) tha

n A

ltern

ativ

e 3.

Alte

rnat

ives

Eval

uatio

n C

riter

ia

Ove

rall

Prot

ectiv

enes

s of

the

Publ

ic

Hea

lth a

nd th

e En

viro

nmen

t

Stan

dard

s, C

riter

ia, &

Gui

danc

e (S

CG

s)

Long

Ter

m E

ffect

iven

ess

&

Perm

anen

ce

Red

uctio

n of

Tox

icity

, Mob

ility

, or

Volu

me

of C

onta

min

atio

n th

roug

h Tr

eatm

ent(3

)

G:\A

PRO

JEC

T\N

orth

rop

Gru

mm

an\S

uper

fund

\201

1\O

U3\

NY0

0149

6.08

11 R

I FS\

Rev

ised

Stu

dy A

rea

FS\F

inal

Rep

ort\T

able

s\Ta

ble

6-2.

xls

- Tab

le 6

.2

Pag

e 2

of 3

Tabl

e 6-

2.D

etai

led

Eval

uatio

n of

Rem

edia

l Alte

rnat

ives

Stud

y Ar

ea F

easi

bilit

y St

udy,

Nor

thro

p G

rum

man

Sys

tem

s C

orpo

ratio

nO

pera

ble

Uni

t 3 (F

orm

er G

rum

man

Set

tling

Pon

ds),

Bet

hpag

e, N

ew Y

ork.

Alte

rnat

ive

1Al

tern

ativ

e 2

Alte

rnat

ive

3Al

tern

ativ

e 4

Alte

rnat

ive

5Al

tern

ativ

e 6

No

Actio

n.• S

hut d

own

all c

urre

nt g

roun

dwat

er

rem

edia

l sys

tem

s.

• Shu

t dow

n al

l pub

lic s

uppl

y w

ellh

ead

prot

ectio

n sy

stem

s.

Bas

elin

e C

ondi

tions

/Con

tinue

d Ac

tion.

• Con

duct

VO

C s

ourc

e re

med

iatio

n at

the

Site

.• C

ontin

ue to

ope

rate

the

follo

win

g re

med

ial/t

reat

men

t sys

tem

s to

pro

tect

wat

er

supp

ly w

ells

and

redu

ce V

OC

mas

s in

the

Stud

y Ar

ea (S

ee F

igur

e 6-

1):

- Exi

stin

g B

WD

wel

lhea

d pr

otec

tion

syst

ems.

- Site

IRM

(4 w

ells

; tot

al 2

10 G

PM).

- Mai

n Fa

cilit

y re

med

ial s

yste

ms,

incl

udin

g To

wer

96

(2 w

ells

; tot

al 1

,500

GPM

) and

To

wer

102

(3 w

ells

; tot

al 2

,300

GPM

). - G

M-3

8 Ar

ea (t

wo

wel

ls; t

otal

1,1

00 G

PM).

• Con

duct

cur

rent

mon

itorin

g.

Alte

rnat

ive

2, P

lus

One

New

Rem

edia

l Wel

l (W

ell R

W-2

1).

• Ins

tall

and

oper

ate

one

new

rem

edia

l wel

l (W

ell R

W-2

1) p

umpi

ng a

t 1,0

00 g

pm to

re

duce

VO

C m

ass

in S

tudy

Are

a gr

ound

wat

er

(See

Fig

ure

6-2)

.•T

reat

ext

ract

ed g

roun

dwat

er fr

om th

e ne

w

wel

l at t

he e

xist

ing

Mai

n Fa

cilit

y re

med

ial

syst

em (T

ower

102

- fo

ur w

ells

tota

l - 2

,800

G

PM).

• Dis

char

ge tr

eate

d w

ater

to N

orth

rop

Gru

mm

an S

outh

Bas

ins.

• Con

duct

exp

ande

d m

onito

ring.

Alte

rnat

ive

2, P

lus

Two

New

Rem

edia

l Wel

ls

(RW

-20

and

RW

-21)

.• I

nsta

ll an

d op

erat

e tw

o ne

w re

med

ial w

ells

(W

ell R

W-2

0 pu

mpi

ng a

t 500

gpm

and

Wel

l R

W-2

1 pu

mpi

ng a

t 500

gpm

) to

redu

ce V

OC

m

ass

in S

tudy

Are

a gr

ound

wat

er (S

ee F

igur

e 6-

3).

• Tre

at e

xtra

cted

gro

undw

ater

from

new

wel

ls

at th

e ex

istin

g M

ain

Faci

lity

rem

edia

l sys

tem

(T

ower

102

- 5

wel

ls to

tal -

2,8

00 G

PM).

• Dis

char

ge tr

eate

d w

ater

to th

e So

uth

Bas

ins.

• Con

duct

exp

ande

d m

onito

ring.

Alte

rnat

ive

2, P

lus

Ope

rate

BW

D P

lant

4 a

s R

emed

iatio

n Sy

stem

, plu

s O

ne N

ew R

emed

ial

Wel

l (R

W-2

0), p

lus

Rep

lace

BW

D P

lant

4

Cap

acity

.• I

nsta

ll an

d op

erat

e on

e ne

w re

med

ial w

ell

(Wel

l RW

-20

pum

ping

at 5

00 g

pm),

and

oper

ate

the

two

exis

ting

BW

D P

lant

4 w

ells

, pu

mpi

ng a

tota

l of 2

,700

GPM

, to

redu

ce V

OC

m

ass

in S

tudy

Are

a gr

ound

wat

er (S

ee F

igur

e 6-

4).

• Tre

at e

xtra

cted

gro

undw

ater

from

the

new

w

ell a

t the

exi

stin

g M

ain

Faci

lity

rem

edia

l sy

stem

(Tow

er 1

02 -

4 re

med

ial w

ells

- 2,

300

GPM

).• D

isch

arge

trea

ted

wat

er to

the

Sout

h B

asin

s.• D

isch

arge

trea

ted

wat

er fr

om B

WD

Pla

nt 4

to c

ombi

natio

n of

the

Arth

ur A

venu

e re

char

ge

basi

n an

d 3

new

sha

llow

inje

ctio

n w

ells

lo

cate

d ne

ar th

e ba

sin.

• Con

duct

exp

ande

d m

onito

ring.

Alte

rnat

ive

2, P

lus

Five

New

Rem

edia

l Wel

ls

(RW

-22

to -2

6).

• Ins

tall

and

oper

ate

5 ne

w re

med

ial w

ells

(RW

-22

to -2

6, p

umpi

ng a

tota

l of 4

,040

gpm

) and

5

new

trea

tmen

t sys

tem

s to

atte

mpt

retu

rnin

g St

udy

Area

gro

undw

ater

to p

re-d

ispo

sal

cond

ition

s (S

ee F

igur

e 6-

5).

• Dis

char

ge tr

eate

d w

ater

to 7

new

inje

ctio

n w

ells

(14

wel

ls to

tal:

7 op

erat

ing,

plu

s 7

back

up).

• Con

duct

exp

ande

d m

onito

ring.

Alte

rnat

ives

Eval

uatio

n C

riter

ia

No

shor

t-ter

m im

pact

s to

the

com

mun

ity, s

ite

wor

kers

, or t

he e

nviro

nmen

t. N

o sh

ort-t

erm

impa

cts

to th

e co

mm

unity

, site

w

orke

rs, o

r the

env

ironm

ent.

One

rem

edia

l wel

l and

ass

ocia

ted

pipe

line

wou

ld b

e in

stal

led

with

in a

resi

dent

ial

neig

hbor

hood

. Sh

ort-t

erm

impa

cts

to th

e co

mm

unity

, site

wor

kers

, and

the

envi

ronm

ent w

ill b

e co

ntro

lled

by: 1

) dus

t an

d tr

affic

con

trol

mea

sure

s w

ill b

e us

ed a

nd

2) p

oten

tial f

or e

xpos

ure

to c

onta

min

ated

w

ater

will

be

miti

gate

d by

util

izin

g po

rtab

le

vess

els

for c

onta

inm

ent a

nd tr

ansp

ortin

g w

ater

bac

k to

the

site

eac

h da

y. W

ater

from

op

erat

ing

rem

edia

l wel

l will

be

conv

eyed

with

du

al-w

all p

ipel

ine,

with

leak

det

ectio

n an

d ot

her e

ngin

eerin

g co

ntro

ls.

Two

rem

edia

l wel

ls a

nd a

ssoc

iate

d pi

pelin

es

wou

ld b

e in

stal

led

with

in a

resi

dent

ial

neig

hbor

hood

. S

ame

as A

ltern

ativ

e 3.

One

rem

edia

l wel

l, th

ree

inje

ctio

ns w

ells

, and

as

soci

ated

pip

elin

es w

ould

be

inst

alle

d w

ithin

a

resi

dent

ial n

eigh

borh

ood.

Sam

e as

Alte

rnat

ive

3 pl

us in

crea

sed

use

of a

dmin

istra

tive

and

engi

neer

ing

cont

rols

(e.g

., du

st c

ontro

l, tra

ffic)

to

min

imiz

e di

srup

tions

to th

e co

mm

unity

as

soci

ated

with

re-p

urpo

sing

BW

D P

lant

4 to

se

rve

as a

rem

edia

l sys

tem

and

for c

onst

ruct

ion

of a

new

wel

lfiel

d/fa

cilit

y at

ano

ther

loca

tion.

Five

rem

edia

l wel

ls, 1

4 in

ject

ions

wel

ls, f

ive

rem

edia

l sys

tem

s, a

nd a

ssoc

iate

d pi

pelin

es w

ould

be

inst

alle

d w

ithin

a re

side

ntia

l nei

ghbo

rhoo

d.S

ame

as A

ltern

ativ

e 3

plus

sub

stan

tially

incr

ease

d us

e of

adm

inis

trativ

e an

d en

gine

erin

g co

ntro

ls

(e.g

., du

st c

ontro

l, tra

ffic)

to m

inim

ize

disr

uptio

ns to

th

e co

mm

unity

ass

ocia

ted

with

con

stru

ctio

n of

five

ne

w re

med

ial s

yste

ms.

Not

app

licab

le; n

o ac

tiviti

es im

plem

ente

d.A

lread

y be

ing

Impl

emen

ted.

Tech

nica

lly a

nd a

dmin

istr

ativ

ely

impl

emen

tabl

e; p

rove

n te

chno

logy

and

co

nstr

uctio

n m

etho

ds; a

cces

s ag

reem

ents

w

ill b

e re

quire

d fo

r ins

talla

tion

of re

med

ial

wel

l and

pip

elin

e th

at is

not

on

Nor

thro

p G

rum

man

pro

pert

y.

Tech

nica

lly a

nd a

dmin

istra

tivel

y im

plem

enta

ble;

ac

cess

agr

eem

ents

will

be

requ

ired

for

inst

alla

tion

of re

med

ial w

ells

and

pip

elin

es th

at

are

not o

n N

orth

rop

Gru

mm

an p

rope

rty.

Tw

o ne

w lo

catio

ns fo

r wel

ls a

nd p

ipel

ines

will

pos

e si

gnifi

cant

add

ition

al a

cces

s di

fficu

lties

, co

mpa

red

to A

ltern

ativ

e 3.

Tech

nica

lly a

nd a

dmin

istra

tivel

y im

plem

enta

ble;

ac

cess

agr

eem

ents

will

be

requ

ired

for

inst

alla

tion

of re

med

ial w

ell,

inje

ctio

n w

ells

, and

pi

pelin

es th

at a

re n

ot o

n N

orth

rop

Gru

mm

an

prop

erty

. W

ill n

eed

to n

egot

iate

agr

eem

ent t

o le

ase

or a

cqui

re B

WD

Pla

nt 4

. W

ill n

eed

to

obta

in a

cces

s fo

r con

stru

ctio

n of

a n

ew w

ellfi

eld

to re

plac

e B

WD

Pla

nt 4

at a

n al

tern

ate

loca

tion.

Ther

e w

ill b

e a

sign

ifica

nt a

mou

nt o

f con

stru

ctio

n (fi

ve re

med

ial w

ells

, fiv

e tre

atm

ent p

lant

s,14

in

ject

ion

wel

ls, a

nd a

ssoc

iate

d pi

pelin

es) i

n a

resi

dent

ial a

rea,

requ

iring

num

erou

s ac

cess

ag

reem

ents

. It

will

be

very

diff

icul

t to

obta

in a

ll th

e re

quire

d ac

cess

agr

eem

ents

.

Not

app

licab

le; n

o ac

tiviti

es im

plem

ente

d.M

ost s

usta

inab

le w

hen

com

pare

d to

Alte

rnat

ives

3,

4, 5

, and

6; r

etur

ns tr

eate

d w

ater

to th

e aq

uife

r th

roug

h re

char

ge b

asin

s; m

axim

izes

use

of

exis

ting

rem

edia

l equ

ipm

ent a

nd re

quire

s no

ad

ditio

nal b

uild

ing

foot

prin

t; an

d, u

tiliz

es e

nerg

y-ef

ficie

nt e

quip

men

t and

/or v

aria

ble

frequ

ency

dr

ives

(e.g

., ex

istin

g sy

stem

blo

wer

and

di

scha

rge

pum

p) w

here

pos

sibl

e to

redu

ce

ener

gy d

eman

d. E

xist

ing

stea

m re

gene

rativ

e V

PG

AC

sys

tem

sig

nific

antly

min

imiz

es w

aste

vo

lum

e pr

oduc

ed fr

om a

ir tre

atm

ent.

Sim

ilar s

usta

inab

ility

to A

ltern

ativ

e 2,

ho

wev

er, h

ighe

r ene

rgy

dem

and

and

larg

er

foot

prin

t as

a re

sult

of th

e ad

ditio

n of

R

emed

ial W

ell R

W-2

1 an

d in

crea

se in

blo

wer

m

otor

siz

e; re

turn

s tr

eate

d w

ater

to th

e aq

uife

r thr

ough

rech

arge

bas

ins;

max

imiz

es

use

of e

xist

ing

rem

edia

l equ

ipm

ent a

nd

requ

ires

min

imal

add

ition

al fo

otpr

int f

or n

ew

reco

very

wel

l vau

lt; a

nd, u

tiliz

es e

nerg

y-ef

ficie

nt e

quip

men

t and

/or v

aria

ble

freq

uenc

y dr

ives

(e.g

., pr

opos

ed s

yste

m b

low

er,

exis

ting

syst

em d

isch

arge

pum

p an

d pr

opos

ed R

emed

ial W

ell R

W-2

1 w

ell p

ump)

w

here

pos

sibl

e to

redu

ce e

nerg

y de

man

d.Ex

istin

g st

eam

rege

nera

tive

VPG

AC

sys

tem

si

gnifi

cant

ly m

inim

izes

was

te v

olum

e pr

oduc

ed fr

om a

ir tr

eatm

ent.

Sim

ilar s

usta

inab

ility

to A

ltern

ativ

e 3,

how

ever

, hi

gher

ene

rgy

dem

and

and

larg

er fo

otpr

int a

s a

resu

lt of

the

addi

tion

of R

emed

ial W

ell R

W-2

0.

Less

sus

tain

able

whe

n co

mpa

red

to A

ltern

ativ

es

2, 3

, and

4.

Req

uire

s ne

w w

ater

sup

ply

syst

em

and

asso

ciat

ed b

uild

ings

for r

epla

cem

ent o

f los

t ca

paci

ty; s

igni

fican

t inc

reas

e in

ene

rgy

dem

and

due

to in

effic

ient

reco

very

wel

l loc

atio

n (i.

e.,

requ

ires

sign

ifica

ntly

larg

er p

umps

to m

aint

ain

com

para

ble

grou

ndw

ater

con

trol w

hen

com

pare

d to

Alte

rnat

ives

2 a

nd 3

); re

quire

s in

stal

latio

n an

d us

e of

a n

ew V

PG

AC

con

trol s

yste

m re

sulti

ng in

ad

ditio

nal f

ootp

rint r

equi

rem

ents

and

incr

ease

d w

aste

vol

ume.

Leas

t sus

tain

able

whe

n co

mpa

red

to A

ltern

ativ

es

2, 3

, 4, a

nd 5

. R

equi

res

seve

ral n

ew re

med

iatio

n sy

stem

s an

d as

soci

ated

bui

ldin

gs; s

igni

fican

t in

crea

se in

ene

rgy

dem

and

due

to th

e us

e of

m

ultip

le n

ew re

med

ial w

ells

, ass

ocia

ted

air

strip

ping

blo

wer

s, a

nd d

isch

arge

pum

ps; r

equi

res

inst

alla

tion

and

use

of s

ever

al n

ew V

PG

AC

con

trol

syst

ems

resu

lting

in a

dditi

onal

foot

prin

t re

quire

men

ts a

nd in

crea

sed

was

te v

olum

e.

Shor

t-Ter

m Im

pact

s an

d Ef

fect

iven

ess

Impl

emen

tabi

lity

Sust

aina

bilit

y(4

)

G:\A

PRO

JEC

T\N

orth

rop

Gru

mm

an\S

uper

fund

\201

1\O

U3\

NY0

0149

6.08

11 R

I FS\

Rev

ised

Stu

dy A

rea

FS\F

inal

Rep

ort\T

able

s\Ta

ble

6-2.

xls

- Tab

le 6

.2

Pag

e 3

of 3

Tabl

e 6-

2.D

etai

led

Eval

uatio

n of

Rem

edia

l Alte

rnat

ives

Stud

y Ar

ea F

easi

bilit

y St

udy,

Nor

thro

p G

rum

man

Sys

tem

s C

orpo

ratio

nO

pera

ble

Uni

t 3 (F

orm

er G

rum

man

Set

tling

Pon

ds),

Bet

hpag

e, N

ew Y

ork.

Alte

rnat

ive

1Al

tern

ativ

e 2

Alte

rnat

ive

3Al

tern

ativ

e 4

Alte

rnat

ive

5Al

tern

ativ

e 6

No

Actio

n.• S

hut d

own

all c

urre

nt g

roun

dwat

er

rem

edia

l sys

tem

s.

• Shu

t dow

n al

l pub

lic s

uppl

y w

ellh

ead

prot

ectio

n sy

stem

s.

Bas

elin

e C

ondi

tions

/Con

tinue

d Ac

tion.

• Con

duct

VO

C s

ourc

e re

med

iatio

n at

the

Site

.• C

ontin

ue to

ope

rate

the

follo

win

g re

med

ial/t

reat

men

t sys

tem

s to

pro

tect

wat

er

supp

ly w

ells

and

redu

ce V

OC

mas

s in

the

Stud

y Ar

ea (S

ee F

igur

e 6-

1):

- Exi

stin

g B

WD

wel

lhea

d pr

otec

tion

syst

ems.

- Site

IRM

(4 w

ells

; tot

al 2

10 G

PM).

- Mai

n Fa

cilit

y re

med

ial s

yste

ms,

incl

udin

g To

wer

96

(2 w

ells

; tot

al 1

,500

GPM

) and

To

wer

102

(3 w

ells

; tot

al 2

,300

GPM

). - G

M-3

8 Ar

ea (t

wo

wel

ls; t

otal

1,1

00 G

PM).

• Con

duct

cur

rent

mon

itorin

g.

Alte

rnat

ive

2, P

lus

One

New

Rem

edia

l Wel

l (W

ell R

W-2

1).

• Ins

tall

and

oper

ate

one

new

rem

edia

l wel

l (W

ell R

W-2

1) p

umpi

ng a

t 1,0

00 g

pm to

re

duce

VO

C m

ass

in S

tudy

Are

a gr

ound

wat

er

(See

Fig

ure

6-2)

.•T

reat

ext

ract

ed g

roun

dwat

er fr

om th

e ne

w

wel

l at t

he e

xist

ing

Mai

n Fa

cilit

y re

med

ial

syst

em (T

ower

102

- fo

ur w

ells

tota

l - 2

,800

G

PM).

• Dis

char

ge tr

eate

d w

ater

to N

orth

rop

Gru

mm

an S

outh

Bas

ins.

• Con

duct

exp

ande

d m

onito

ring.

Alte

rnat

ive

2, P

lus

Two

New

Rem

edia

l Wel

ls

(RW

-20

and

RW

-21)

.• I

nsta

ll an

d op

erat

e tw

o ne

w re

med

ial w

ells

(W

ell R

W-2

0 pu

mpi

ng a

t 500

gpm

and

Wel

l R

W-2

1 pu

mpi

ng a

t 500

gpm

) to

redu

ce V

OC

m

ass

in S

tudy

Are

a gr

ound

wat

er (S

ee F

igur

e 6-

3).

• Tre

at e

xtra

cted

gro

undw

ater

from

new

wel

ls

at th

e ex

istin

g M

ain

Faci

lity

rem

edia

l sys

tem

(T

ower

102

- 5

wel

ls to

tal -

2,8

00 G

PM).

• Dis

char

ge tr

eate

d w

ater

to th

e So

uth

Bas

ins.

• Con

duct

exp

ande

d m

onito

ring.

Alte

rnat

ive

2, P

lus

Ope

rate

BW

D P

lant

4 a

s R

emed

iatio

n Sy

stem

, plu

s O

ne N

ew R

emed

ial

Wel

l (R

W-2

0), p

lus

Rep

lace

BW

D P

lant

4

Cap

acity

.• I

nsta

ll an

d op

erat

e on

e ne

w re

med

ial w

ell

(Wel

l RW

-20

pum

ping

at 5

00 g

pm),

and

oper

ate

the

two

exis

ting

BW

D P

lant

4 w

ells

, pu

mpi

ng a

tota

l of 2

,700

GPM

, to

redu

ce V

OC

m

ass

in S

tudy

Are

a gr

ound

wat

er (S

ee F

igur

e 6-

4).

• Tre

at e

xtra

cted

gro

undw

ater

from

the

new

w

ell a

t the

exi

stin

g M

ain

Faci

lity

rem

edia

l sy

stem

(Tow

er 1

02 -

4 re

med

ial w

ells

- 2,

300

GPM

).• D

isch

arge

trea

ted

wat

er to

the

Sout

h B

asin

s.• D

isch

arge

trea

ted

wat

er fr

om B

WD

Pla

nt 4

to c

ombi

natio

n of

the

Arth

ur A

venu

e re

char

ge

basi

n an

d 3

new

sha

llow

inje

ctio

n w

ells

lo

cate

d ne

ar th

e ba

sin.

• Con

duct

exp

ande

d m

onito

ring.

Alte

rnat

ive

2, P

lus

Five

New

Rem

edia

l Wel

ls

(RW

-22

to -2

6).

• Ins

tall

and

oper

ate

5 ne

w re

med

ial w

ells

(RW

-22

to -2

6, p

umpi

ng a

tota

l of 4

,040

gpm

) and

5

new

trea

tmen

t sys

tem

s to

atte

mpt

retu

rnin

g St

udy

Area

gro

undw

ater

to p

re-d

ispo

sal

cond

ition

s (S

ee F

igur

e 6-

5).

• Dis

char

ge tr

eate

d w

ater

to 7

new

inje

ctio

n w

ells

(14

wel

ls to

tal:

7 op

erat

ing,

plu

s 7

back

up).

• Con

duct

exp

ande

d m

onito

ring.

Alte

rnat

ives

Eval

uatio

n C

riter

ia

$0

Mai

n Fa

cilit

y S

yste

m O

&M

$

19.9

MG

roun

dwat

er IR

M O

&M

$

4.7M

Par

k S

ourc

e R

emed

iatio

n

$1

5.6M

Pla

nt 4

Wel

lhea

d Tr

eatm

ent

$

0.1M

Bas

elin

e To

tal

$4

0.3M

(2)

Bas

elin

e C

ost

$

40.3

MA

lt. 3

Cap

ital C

ost

$5.9

MA

lt. 3

O&

M C

ost

$7

.8M

Alt.

3 T

otal

$54.

0M

Bas

elin

e C

ost

$

40.3

MA

lt. 4

Cap

ital C

ost

$9.0

MA

lt. 4

O&

M C

ost

$9

.4M

Alt.

4 T

otal

$58.

7M

Bas

elin

e C

ost

$

40.3

MA

lt. 5

Cap

ital C

ost

$

22.3

MA

lt. 5

O&

M C

ost

$33

.4M

Alt.

5 T

otal

$96

.0M

Bas

elin

e C

ost

$

40.3

MA

lt. 6

Cap

ital C

ost

$

49.9

MA

lt. 6

O&

M C

ost

$87

.7M

Alt.

6 T

otal

$

177.

9M

NO

TES:

(1)

(2)

Incl

udes

30

year

pre

sent

wor

th c

ost f

or: O

M&

M o

f the

exi

stin

g M

ain

Faci

lity

Trea

tmen

t Sys

tem

, Site

IRM

(ass

umes

the

Site

IRM

ope

rate

s fo

r 15

year

s), a

nd P

lant

4 w

ellh

ead

prot

ectio

n; a

nd c

apita

l cos

t for

Par

k so

urce

redu

ctio

n.(3

)E

stim

ates

of T

VO

C m

ass

rem

oved

cal

cula

ted

for e

ach

alte

rnat

ive,

as

follo

ws:

Mod

el-p

redi

cted

TV

OC

mas

s (s

ee A

ppen

dix

A, T

able

A-2

) tha

t will

be

rem

oved

afte

r 30

yrs,

redu

ced

to a

ccou

nt fo

r pul

sed

oper

atio

n of

pro

pose

d re

med

ial w

ells

from

Yea

rs 2

0-25

and

shu

tdow

n of

pro

pose

d re

med

ial w

ells

from

Yea

rs 2

5-30

(per

6 N

YC

RR

6.4

, see

Sec

tion

6.3

of th

is R

epor

t),

plus

the

Par

k so

urce

are

a V

OC

mas

s to

be

rem

oved

(est

imat

ed to

be

44,0

00 lb

s).

(4)

In a

dditi

on to

the

regu

lato

ry-d

riven

sel

ectio

n cr

iteria

, Nor

thro

p G

rum

man

has

con

side

red

alte

rnat

ives

that

con

serv

e lim

ited

ener

gy a

nd o

ther

reso

urce

s (s

ee s

ectio

n 7)

.(5

)Th

e B

ethp

age

Wat

er D

istri

ct tr

eatm

ent g

oal i

s no

n-de

tect

for a

ll vo

latil

e or

gani

c co

mpo

unds

(H2M

200

8).

DEF

INIT

ION

S:P

ark

Por

tion

of th

e B

ethp

age

Com

mun

ity P

ark

not s

ubje

ct to

soi

l rem

oval

dur

ing

Tow

n re

deve

lopm

ent a

ctiv

ities

Mai

n Fa

cilit

yN

orth

rop

Gru

mm

an M

ain

Faci

lity,

use

d to

refe

rred

to c

urre

nt re

med

ial s

yste

ms

asso

ciat

ed w

ith O

U2

(Tow

er 9

6 an

d To

wer

102

)B

WD

Bet

hpag

e W

ater

Dis

trict

V

OC

sV

olat

ile O

rgan

ic C

ompo

unds

RA

Os

Rem

edia

l Act

ion

Obj

ectiv

esS

CG

sS

tand

ard,

Crit

eria

and

Gui

delin

esgp

mga

llons

per

min

ute

IRM

Inte

rim R

emed

ial M

easu

reR

emed

ial S

yste

mR

emed

ial w

ells

, air

strip

ping

tow

er, o

ff-ga

s ai

r tre

atm

ent (

VP

GA

C a

nd, i

n so

me

case

s, P

PZ)

, and

dis

char

ge to

loca

l bas

in(s

).P

PZ

Pot

assi

um p

erm

anga

nate

impr

egna

ted

zeol

iteV

PG

AC

Vap

or p

hase

gra

nula

r act

ivat

ed c

arbo

nE

xpan

ded

Plu

me

man

agem

ent,

perfo

rman

ce, a

nd e

ffect

iven

ess

mon

itorin

g (a

s de

scrib

ed in

NY

SD

EC

DE

R-1

0)M

onito

ring

NY

SD

EC

New

Yor

k S

tate

Dep

artm

ent o

f Env

ironm

enta

l Con

serv

atio

nD

ER

Div

isio

n of

Env

ironm

enta

l Rem

edia

tion

Cos

t Effe

ctiv

enes

s (1

)

Det

aile

d co

st e

stim

ates

are

pro

vide

d in

App

endi

x B

.

Rec

omm

ende

d A

ltern

ativ

e R

atio

nale

Alte

rnat

ive

3 is

reco

mm

ende

d be

caus

e it

is c

apab

le o

f ach

ievi

ng th

e R

AO

s, p

rovi

des

the

grea

test

cum

ulat

ive

bene

ficia

l effe

ct o

n B

WD

Pla

nts

4 an

d 5

(i.e.

, low

est p

eak

VOC

con

cent

ratio

n an

d gr

eate

st ra

te o

f dec

reas

e in

VO

C c

once

ntra

tions

in th

e w

ells

), is

effe

ctiv

e in

the

shor

t-ter

m

and

long

-term

, and

is c

ost e

ffect

ive.

Alte

rnat

ive

1 is

not

reco

mm

ende

d be

caus

e it

does

not

ach

ieve

RA

Os.

Alte

rnat

ive

2 is

not

reco

mm

ende

d be

caus

e it

rem

oves

the

leas

t am

ount

of V

OC

mas

s an

d ha

s th

e le

ast c

umul

ativ

e be

nefit

to B

WD

Pla

nts

4 an

d 5.

Alte

rnat

ive

4 is

not

re

com

men

ded

beca

use,

alth

ough

it re

mov

es a

slig

htly

gre

ater

qua

ntity

of V

OC

mas

s co

mpa

red

to A

ltern

ativ

e 3,

it h

as a

hig

her c

ost a

nd d

oes

not p

rovi

de a

s gr

eat a

cum

ulat

ive

bene

fit to

BW

D P

lant

s 4

and

5 as

Alte

rnat

ive

3. A

ltern

ativ

e 5

is n

ot re

com

men

ded

beca

use,

alth

ough

it

rem

oves

a s

light

ly g

reat

er q

uant

ity o

f VO

C m

ass

than

Alte

rnat

ive

3, it

s co

st is

nea

rly tw

ice

that

of A

ltern

ativ

e 3

and

it pr

ovid

es le

ss c

umul

ativ

e be

nefic

ial e

ffect

on

BW

D P

lant

s 4

and

5. A

ltern

ativ

e 6

is n

ot re

com

men

ded

beca

use,

alth

ough

it re

mov

es m

ore

VOC

mas

s th

an A

ltern

ativ

e 3,

its

cost

is th

ree

times

that

of A

ltern

ativ

e 3

and

it pr

ovid

es n

o ad

ditio

nal b

enef

it to

BW

D P

lant

s 4

and

5 co

mpa

red

to A

ltern

ativ

e 3.

G:\A

PRO

JEC

T\N

orth

rop

Gru

mm

an\S

uper

fund

\201

1\O

U3\

NY0

0149

6.08

11 R

I FS\

Rev

ised

Stu

dy A

rea

FS\F

inal

Rep

ort\T

able

s\Ta

ble

6-2.

xls

- Tab

le 6

.2

Tabl

e 8-

1.Su

mm

ary

of C

ompr

ehen

sive

Rec

omm

ende

d R

emed

y Fo

r Site

and

Stu

dy A

reas

,St

udy

Are

a Fe

asib

ility

Stu

dy, N

orth

rop

Gru

mm

an S

yste

ms

Cor

pora

tion

Ope

rabl

e U

nit 3

(For

mer

Gru

mm

an S

ettli

ng P

onds

), B

ethp

age,

New

York

.

Soils

Par

kS-

P2:

• Exc

avat

e up

per 2

ft o

f soi

l to

Res

trict

ed-R

esid

entia

l SC

Os

and

back

fill w

ith c

lean

soi

l. • I

nsta

ll de

mar

catio

n ba

rrie

r bet

wee

n th

e cl

ean

soil

and

the

unde

rlyin

g so

ils.

• Im

plem

ent l

and-

use

rest

rictio

n in

the

form

of a

n en

viro

nmen

tal e

asem

ent t

o lim

it si

te u

se w

here

resi

dual

soi

l im

pact

s ex

ist a

bove

Unr

estri

cted

Use

SC

Os.

8.0

Acc

ess

Roa

dS-

AR

2:• I

nsta

ll gr

avel

cap

ove

r are

as w

here

soi

l exc

eeds

Res

trict

ed R

esid

entia

l SC

Os.

• Im

plem

ent l

and-

use

rest

rictio

n in

the

form

of a

n en

viro

nmen

tal e

asem

ent t

o lim

it si

te u

se w

here

resi

dual

soi

l im

pact

s ex

ist a

bove

Unr

estri

cted

Use

SC

Os.

• Ins

tall

fenc

ing

and

sign

age

to li

mit

acce

ss.

0.6

Sour

ce A

reas

SA-3

:• R

emed

iate

VO

C s

ourc

e ar

eas

usin

g IS

TD.

15.6

Soil

Gas

SG-2

:• C

ontin

ue to

ope

rate

, mai

ntai

n, a

nd m

onito

r the

exi

stin

g S

oil G

as IR

M s

yste

m to

pre

vent

offs

ite m

igra

tion

of s

oil g

as fr

om th

e S

ite A

rea

until

term

inat

ion

crite

ria a

re a

chie

ved

(to b

e de

velo

ped

and

incl

uded

in th

e O

M&M

Man

ual)

.• E

stab

lish

envi

ronm

enta

l eas

emen

t tha

t req

uire

s in

stal

latio

n of

eng

inee

ring

cont

rols

to c

ontro

l vap

or in

trusi

on fo

r any

new

stru

ctur

es c

onst

ruct

ed o

nsite

. M

aint

ain

envi

ronm

enta

l eas

emen

t unt

il on

site

soi

l gas

m

eets

app

licab

le R

AO

s.

1.9

(2)

Gro

undw

ater

(3)

GW

-2:

• Con

tinue

to o

pera

te, m

aint

ain,

and

mon

itor t

he e

xist

ing

Gro

undw

ater

IRM

sys

tem

to p

reve

nt o

ffsite

mig

ratio

n of

VO

Cs

in g

roun

dwat

er th

at e

xcee

d 5

ug/L

tota

l VO

Cs

in th

e up

per 2

0 fe

et o

f the

aqu

ifer a

nd 5

0 ug

/L a

t dep

ths

belo

w th

e up

per 2

0 fe

et o

f the

aqu

ifer.

• Im

plem

ent g

roun

dwat

er u

se re

stric

tion

thro

ugh

an e

nviro

nmen

tal e

asem

ent t

o pr

even

t use

of o

nsite

gro

undw

ater

.• S

hut d

own

the

Gro

undw

ater

IRM

whe

n te

rmin

atio

n cr

iteria

are

ach

ieve

d (to

be

deve

lope

d an

d in

clud

ed in

the

OM

&M

Man

ual)

• Fol

low

ing

IRM

shu

tdow

n, c

ondu

ct n

atur

al a

ttenu

atio

n m

onito

ring

for r

esid

ual V

OC

s.

Alte

rnat

ive

3:• I

n ad

ditio

n to

GW

-2 a

bove

, con

tinue

to o

pera

te, m

aint

ain,

and

mon

itor t

he fo

llow

ing

rem

edia

l/tre

atm

ents

yste

ms

to p

rote

ct p

ublic

wat

er s

uppl

ies

and

redu

ce V

OC

mas

s in

the

Stu

dy A

rea:

1) B

WD

wel

lhea

d tre

atm

ent s

yste

ms;

2) M

ain

Faci

lity

rem

edia

l sys

tem

, and

3) G

M-3

8 A

rea

rem

edia

l sys

tem

.• I

nsta

ll an

d op

erat

e on

e ne

w re

med

ial w

ell (

Wel

l RW

-21)

to re

duce

VO

C m

ass

in S

tudy

Are

a gr

ound

wat

er.

Trea

t ext

ract

ed g

roun

dwat

er fr

om th

e ne

w w

ell a

t the

exi

stin

g M

ain

Faci

lity

rem

edia

l sys

tem

.

38.4

(2)

64.5

Not

es:

1. 2. 3. 4.S

ee S

ite A

rea

FS fo

r dis

cuss

ion

and

eval

uatio

n of

rem

edie

s fo

r Site

Are

a so

il, s

ourc

e ar

eas,

soi

l gas

, and

gro

undw

ater

.C

ost f

or A

ltern

ativ

e 3,

unl

ike

Tabl

e 6-

2, d

o no

t inc

lude

cos

ts fo

r sou

rce

rem

edia

tion

at th

e P

ark,

nor

the

Gro

undw

ater

IRM

, as

thes

e co

sts

are

alre

ady

incl

uded

abo

ve.

The

oper

atio

nal p

erio

ds o

f the

Gro

undw

ater

and

Soi

l Gas

IRM

s ar

e as

sum

ed to

be

sign

ifica

ntly

redu

ced

if V

OC

s so

urce

are

as a

re re

med

iate

d vi

a A

ltern

ativ

e S

A-3

. A

ccor

ding

ly, t

he c

osts

in th

is ta

ble

are

less

than

thos

e pr

ovid

ed in

Tab

les

7-6

and

7-7

in

the

Site

Are

a FS

and

refle

ct re

duce

d IR

M o

pera

tiona

l tim

efra

mes

and

a s

igni

fican

t red

uctio

n in

VO

C m

ass

treat

ed b

y th

e IR

Ms.

The

Soi

l Gas

IRM

is a

ssum

ed to

ope

rate

for 1

0 ye

ars

and

the

Gro

undw

ater

IRM

is a

ssum

ed to

ope

rate

for 1

5 ye

ars.

TOTA

L

Cos

t($

MM

) (1)

Rec

omm

ende

d A

ltern

ativ

e (4

)M

edia

/Are

a

Det

aile

d co

st b

reak

dow

ns a

re p

rovi

ded

in A

ppen

dix

B.

G:\A

PR

OJE

CT\

Nor

thro

p G

rum

man

\Sup

erfu

nd\2

011\

OU

3\N

Y001

496.

0811

RI F

S\R

evis

ed S

tudy

Are

a FS

\Fin

al R

epor

t\Tab

les\

Tabl

e 8-

1.xl

sx

BETHPAGEHIGH SCHOOL

EXISTING OU2TREATMENTSYSTEMS

PLANT25

WT

VP-106

VP-113

VP-110R

VP-117

VP-116

BCPMW-5-1

B24MW-3

MW-107-1

MW-108-1

MW-100-3MW-100-2MW-100-1

MW-102-1

MW-111-4

MW-116-5

MW-117-5

MW-64IMW-64D

MW-64S

MW-61IMW-61D1

MW-61S

MW-60IMW-60D

MW-60S

HN-28SHN-28I

HN-40SHN-40I

GM-73DGM-73D2

MW-200-1 MW-201-1

MW-202-1 MW-203-1

VP-118

MW-118-5

A'

A

ALL COORDINATES REFERENCED TONORTH AMERICAN DATUM 1983

STUDY AREA SHOWING WELL ANDVERTICAL PROFILE BORING LOCATIONS

AND LINE OF SECTION A-A'

STUDY AREA FEASIBILITY STUDYNORTHROP GRUMMAN SYSTEMS CORPORATION

OPERABLE UNIT 3 (FORMER GRUMMAN SETTLING PONDS)BETHPAGE, NEW YORK

PROPERTY BOUNDARY OF THE FORMERGRUMMAN AEROSPACE PROPERTY

PROPERTY BOUNDARY OF THE FORMERU.S. NAVY PROPERTY

PROPERTY BOUNDARY OF THE FORMEROCC PROPERTY

STUDY AREA LIMIT(APPROXIMATE)

APPROXIMATE LIMIT OF REGIONALAREA OF VOC-IMPACTED GROUNDWATER•• • • • • •• • •• • • • •• • • • • • • • • • •• • •• • •• •• • •• ••••••••••••••••••••••••••••••••••••••••

LONG ISLAND RAILROAD

DENOTES NORTHROP GRUMMAN OWNED PROPERTY

DENOTES FORMER U.S. NAVY OWNED PROPERTY

RECHARGE BASIN

LINE OF SECTION

SITE AREA

MICROGRAMS PER LITER

FIGURE

2-1

IMAGES:XREFS: offsite

PROJECTNAME: NY001493.0809.00008

CITY:Melville-NY DIV/GROUP:SER1 DB:A.Sanchez LD: PIC: PM:C.S.Giovanni TM:D.Stern LYR:ON=*;OFF=*REF*G:\ENVCAD\Melville-NY\ACT\NY001496\0811\FS0D4\00006\Fig 2-1 study area.dwg LAYOUT: 2-1 SAVED: 2/24/2011 3:27 PM ACADVER: 18.0S (LMS TECH) PAGESETUP: ANSI D PLOTSTYLETABLE: ARCADIS_MELVILLE.CTB PLOTTED: 4/6/2011 4:09 PM BY: SANCHEZ, ADRIAN

A

OBSERVATION, MONITORING WELL

INDUSTRIAL WELL

PUBLIC SUPPLY WELL

IRRIGATION WELL

INJECTION WELL

NORTHROP GRUMMAN OR NAVY PRODUCTION WELL

OU2 VERTICAL PROFILE BORING


ABANDONED WELL

A'

NOTES:

1. VERTICAL PROFILE BORING LOCATIONSBASED ON FIELD MEASUREMENTS.

2. HYDROGEOLOGIC ZONE BASED ON MODEL LAYERELEVATIONS PRESENTED IN COMPREHENSIVEGROUNDWATER MODEL (ARCADIS 2003).

EXPLANATION:

DEEP

DEEP2

DESIGNATION OF HYDROGEOLOGIC ZONE FORMONITORING WELL SCREENED INTERVALS

(ARCADIS 2003)

• • •• • • • •

INTERMEDIATE

SHALLOW

SITE AREA

STUDY AREA

CITY:MelviIIe-NY D1V/GROUP:SER1 DBASanchez LD: PIC: PM:C.S.Giovanni TM:D.Stem LYRON=*;OFF=*REF*G:\ENVCAD\Me]vilie-NY\ACT\NY001496\0811\FSOD4\00006\Fig 3-1 conceptual site modeI.dwg LAYOUT: 3-1 SAVED: 2/24/2011 3:21 PM ACADVER: 18.0$ (LMS TECH) PAGESETUP: PDF PLOTSTYLETABLE: ARCADIS_MELVILLE.CTB PLOTTED: 4/6/2011 8:38 PM BY: SANCHEZ, ADRIAN

XREFS: IMAGES: PROJECTNAME: NY001493.0B09.0000B

HISTORICALSOURCEAREAS

INDUSTRIALPROPERTIES

WEST ANDADJACENT TO

SITE

HISTORICALRELEASE

MECHANISM IMPACTED MEDIA TRANSPORT MECHANISMS PATHWAY

OFF-SITEEXPOSURE RECEPTOR

ROUTE HUMAN---

SITEAREA* --......-IPERCOLATIONI .. 1GROUNDWATER I ..

DIFFUSION(DUAL DOMAIN);

ADVECTIVETRANSPORT-

AND NORTHROPGRUMMAN INAVY I OCCPUMPING IRECHARGE

--....-1 GROUNDWATER I ..NONE

PUBLIC WATERSUPPLY WELL HEAD

TREATMENT INPLACE

* OFF-SITE MIGRATION OF VOCs NOWCONTROLLED BY INTERIM REMEDIALMEASURE SINCE JULY 2009



STUDY AREA CONCEPTUAL SITE MODEL

AR ISFIGURE

3-1

BETHPAGEHIGH SCHOOL

EXISTING OU2TREATMENTSYSTEMS

PLANT25

WT

VP-106

VP-113

VP-110R

VP-117

VP-116

BCPMW-5-1

B24MW-3

MW-107-1

MW-108-1

MW-100-3MW-100-2MW-100-1

MW-102-1

MW-111-4

MW-116-5

MW-117-5

MW-64IMW-64D

MW-64S

MW-61IMW-61D1

MW-61S

MW-60IMW-60D

MW-60S

HN-28SHN-28I

HN-40SHN-40I

GM-73DGM-73D2

MW-200-1MW-201-1

MW-202-1 MW-203-1

VP-118MW-118-5

A'

A

ALL COORDINATES REFERENCED TONORTH AMERICAN DATUM 1983

TVOC DATA DISPLAYED CONSISTS OF:

� AVERAGE OF MONITORING WELL AND PUBLICSUPPLY WELL DATA FROM 2004 THROUGH 2007

� NORTHROP GRUMMAN AND NAVYVERTICAL PROFILE BORING INFORMATION

CONCENTRATIONS OF TVOCsIN REGIONAL AREA GROUNDWATER -

PLAN VIEW



FIGURE

3-2

IMAGES:XREFS: offsite

PROJECTNAME: ----

CITY:(Reqd) DIV/GROUP:(Reqd) DB:(Reqd) LD:(Opt) PIC:(Opt) PM:(Reqd) TM:(Opt) LYR:(Opt)ON=*;OFF=*REF*G:\ENVCAD\Melville-NY\ACT\NY001496\0811\FS0D4\00006\Fig 3-2 tvoc conc gw_100603.dwg LAYOUT: 3-2 SAVED: 2/24/2011 4:41 PM ACADVER: 18.0S (LMS TECH) PAGESETUP: ANSI D PLOTSTYLETABLE: ARCADIS_MELVILLE.CTB PLOTTED: 4/6/2011 4:09 PM BY: SANCHEZ, ADRIAN

• • •• • •• • • • • • • •

DEFINITIONS OF TVOCCONCENTRATION CONTOURS IN

GROUNDWATER

50

500

5000

• • • •• • •• • • • • • • • •

• • • • •• • •• • • • • • • • • •

1000 • • • • •• • •• • • • • • • • • •

NOTE:

1. VPB LOCATIONS BASED ON FIELD MEASURMENTS.

PROPERTY BOUNDARY OF THE FORMERGRUMMAN AEROSPACE PROPERTY

PROPERTY BOUNDARY OF THE FORMERU.S. NAVY PROPERTY

PROPERTY BOUNDARY OF THE FORMEROCC PROPERTY


DENOTES NORTHROP GRUMMANOWNED PROPERTY

DENOTES FORMER U.S. NAVYOWNED PROPERTY

RECHARGE BASIN

LINE OF TVOC CROSS-SECTION

OBSERVATION, MONITORING WELL

INDUSTRIAL WELL

PUBLIC SUPPLY WELL

IRRIGATION WELL

INJECTION WELL

NORTHROP GRUMMAN ORNAVY PRODUCTION WELL



ABANDONED WELL

EXPLANATION:

• • •• • • • •

TVOC

VPB

(WELL 17)

A A'

• •• • •• • • • • • •5

TOTAL VOLATILE ORGANIC COMPOUND

MICROGRAMS PER LITER

VERTICAL PROFILE BORING

BETHPAGE OUTPOST WELL

REMEDIAL WELL

BETHPAGE WATER DISTRICT

SOUTH FARMINGDALE WATER DISTRICT

VILLAGE OF FARMINGDALE

TOWN OF HEMPSTEAD(LEVITTOWN WATER DISTRICT)

BPOW

RW

BWD

SFWD

VOF

TOH (LWD)

A SITE BOUNDARY

NORTHWEST!

STUDY AREA A'SOUTHEAST

FIGURE

.$,,,,,,,-

CONCENTRATIONS OF TVOCsIN GROUNDWATER

(CROSS SECTION A-A')


OPERABLE UNIT 3B\f-?HRp~~~~~~~~~~~ETTLING PONDS)

NOTES

1 HYDROGEOLOGIC ZONE BASED ON MODEL LAYER ELEVATIONS PRESENTEO IN COMPREHENSIVE GROUNDWATER MODEL (ARCADIS 2003)

VERTICAL PROFILE BORING LOCATIONS ARE BASED ON FIELD MEASUREMENTS

3 MONITORING WELLS SURVEYED TO NAD 1983

4 THE FIGURE UTILIZES DATA PRESENTED IN STUDY AREA REMEDIAL INVESTIGATION REPORT (ARCAOIS 2011)

5 LAND SURFACE ESTIMATEO FROM USGS QUADRANGLES (AMITYVILLE. HUNTINGTON, FREEPORT. AND HICKSVILLE)

THE GEOLOGICAL TERM "SAND" REFERENCED ABOVE IS DEFINED IN DETAn..IN THE STUDY AREA REMEDIAL INVESTIGATION REPORTLOCALIZED LENSES OF LOWER PERMEABILITY NOT SHOWN. REFER TO STUDY AREA REMEDIAL INVESTIGATION REPORT FOR THISINFORMATION (ARCADIS 2009)

A GROUNDWATER INTERIM REMEDIAL MEASURE WAS INSTALLED IN JULY 2009 TO CONTAIN ON SITE TOTAL VOLATILE ORGANICCOMPOUND PLUME. THE EFFECTIVENESS OF THE GROUNDWATER INTERIM REMEDIAL MEASURE WILL BE DOCUMENTED INOPERATION, MAINTENANCE AND MONITORING REPORTS

ESTIMATED WATERLEVEL ELEVATION(FTMSL)

WELLI-SCREENEDr INTERVAL

WELLI--SCREENED

.._ INTERVAL

VERTICAL PROFILEDESIGNATlONl

..§(:-<:;,"

:;~R~~~~~~~} ----r----------

:::::-----.-.~.--

~

-TYOC CONCENTRATION (IN ~gIL)J

OBTAINED FROM VPB HYDROPUNCH SAMPLES.THE 5.0 VALUE WHERE SHOWN WITHPURPLE HASH MARK REPRESENTS A

NON-DETECT ANALYTICAL RESULT [Le.• <5~gILlAT INDICATED SAMPLE COLLECTION DEPTH

VA~~~::~TEHE~R~~~ ~z:-~~~~AT SAMPLE COLLECTION DEPTH

LONG ISLAND RAILROAD CENTRAL AVENUE

,,.>! !

,~" I ,or I(

",,<I. , ..§(' ,.....§('eN""ReA" "' I ( i (~f I( (. ( ( -I' f I

I I I - l~~_~~'A"""R"""'UR"CA"'C"-'~---+f------

-

PUBLIC SUPPLY WELL



-DESIGNATION OF HYDROGEOLOGIC ZONE FOR

MONITORING WELL SCREENED INTERVALS(ARCADlS20031

A r------1 A I LINE OF SECTION

"

..§(~<:;,"

J'''O/

t,oo

I ... ! 'I '. --........ .'-..;:....... --If"'. ----=

-----_C_~ : I~---._-:_--- ~-~"%---~---.......:::: - ---::- .~-- -~

~~~:l.OOO 4,000 5,000 6,000 7,000 8,000 9,000 10,000 11,000 12,000 13,000

DIST~~~~I~~~C;;:~8~~1fgJ:~~ (FT)

~~

!~

~~

~~1,"9.fii~~~~

~~~::i

If5: g,,~

~"~~

~i~~~~

:! ~l~ ~ ~... ~~\ ~ 1-1't .-::- .~.. I :OCCQ"~OUR:o.:u ~ ,- 1. '\..l. _ f t ,.- -..,. - ~g RARITAN CLAY CONFINING UNIT6 ~ . ~ ..- ~~... -, __' __ 500 ~glL 7/7/// (ToP ELEVATION IS ESTIMATED)

~~ ~ ~ '- - .. . ., --- 1000~glL FT FEET

:~ • PLAN VIEW SHOWING LINE OF SECTION A-A' '. -""""', M'I M~""'\"" WEll ~ A-KlAUI' I 3-3~~ ". " '000' woo' ;voc m",vO\",IC __~,~~~~~~~Q A\\COOROI"TESREFEmCEDTO ~c\l: oJg~ ~i SC,l,lE IN fEET ORGANICCOMPOOND NORTH AMERICAN DATUM 1983



NOTE:

1. BASELINE CONDITIONS/CONTINUED ACTION. PLUS SOURCE AREA REMOVAL AT SITE AREA. CONTINUETO OPERATE SITE IRM, MAIN FACILITY, AND GM-38 REMEDIAL TREATMENT SYSTEMS. OPERATEEXISTING BWD WELL HEAD PROTECTION SYSTEMS.

FIGURE

6-1

ALTERNATIVE 2 - BASELINECONTINUED ACTION

CONCEPTUAL SITE LAYOUT

u 500' 1200'

""' • FEET

PROPERTY BOUNDARY OF THE FORMER U.S. NAVY SITE

PROPERTY BOUNDARY OF THE FORMER OCC SITE


IRM INTERIM REMEDIAL MEASURE

STUDY AREA PUBLIC SUPPLY WELL

RECHARGE BASIN

EXISTING SITE IRM GROUNDWATER TREATMENT SYSTEM

~ EXISTING MAIN FACILITY REMEDIAL WELL (TOWER 96)

LEGEND:

PROPERTY BOUNDARY OF THE FORMERGRUMMAN AEROSPACE CORPORATION SITE

~ EXISTING THIRD PARTY REMEDIAL WELL (GM-38 AREA)

EXISTING SYSTEM INFLUENT PIPELINE

TYOC ISO-CONCENTRATION CONTOUR INMICROGRAMS PER LITER (~g/L)

PUBLIC SUPPLY WELL

EXISTING THIRD PARTY REMEDIAL TREATMENT SYSTEM(GM-38 AREA)

EXISTING MAIN FACILITY REMEDIAL WELL (TOWER 102)

EXISTING MAIN FACILITY REMEDIAL TREATMENT SYSTEM(TOWER 102)

'* EXISTING SITE IRM REMEDIAL WELL

I

*

ALL COOROINATES REFERENCED TONORTH AMERICAN DATUM 1983

GPM GALLONS PER MINUTE

BWD BETHPAGE WATER DISTRICT

TYOC TOTAL VOLATILE ORGANIC COMPOUND

I't?L .._t-

-.TOWERS 96 & 102

DISCHARGE LOCATION(SOUTH BASINS)

\ ~.-....<::o

"I

·T

T \._

- -=-----:-:-.-~

I

~

~

i..§~.

~.i~:;go~§

i~~f

Ji.,..,.;;:

t:fg~

~!

II""~~~~

'O~g~

~~!2.'!!2:'5';1E~I~IUCl x



FIGURE

6-2

ALTERNATIVE 3 - ALTERNATIVE 2 PLUSONE NEW REMEDIAL WELLCONCEPTUAL SITE LAYOUT

u 500' 1200'

""' • FEET



• STUDY AREA PUBLIC SUPPLY WELL



LEGEND:






PUBLIC SUPPLY WELL

RECHARGE BASIN

I

*

EXISTING SYSTEM INFLUENT PIPELINE* PROPOSED REMEDIAL WELL

PROPOSED SYSTEM INFLUENT PIPELINE



EXISTING MAIN FACILITY REMEDIAL TREATMENT SYSTEM(TOWER 102)"* EXISTING SITE IRM REMEDIAL WELL





NOTE:

1. ALTERNATIVE 2 PLUS NEW REMEDIAL WELL RW-21 PUMPING AT 1,000 GPM TO REDUCE VOC MASS INSTUDY AREA GROUNDWATER. EXTRACTED GROUNDWATER WILL BE TREATED AT THE EXISTING MAINFACILITY REMEDIAL TREATMENT SYSTEM.

-+'

I't?L .._

t-

TOWERS 96 & 102DISCHARGE LOCATION

(SOUTH BASINS)

u

\ ~.-....<::o

'I

·T

-y-

T \._

- ~--=-,

I

~

~

i..§~.

~.i~:;go~§

i~~f

Ji.,..,.;;:

t:fg~

~!

II""~~~~

'O~g~

~~!2.'!!2:'5';1E~I~IUCl x

FIGURE

6-3

ALTERNATIVE 4 - ALTERNATIVE 2 PLUSTWO NEW REMEDIAL WELLSCONCEPTUAL SITE LAYOUT

EXISTING SITE IRM REMEDIAL WELL





u 500' 1200'

""' • FEET




EXISTING SYSTEM INFLUENT PIPELINE* PROPOSED REMEDIAL WELL



LEGEND:






PUBLIC SUPPLY WELL



STUDY AREA PUBLIC SUPPLY WELL

RECHARGE BASIN




I

*•*

NOTE:

1. ALTERNATIVE 2 PLUS TWO (2) NEW REMEDIAL WELLS: WELL RW-20 AND WELL RW-21 EACH PUMPING AT500 GPM, TO REDUCE VOC MASS IN STUDY AREA GROUNDWATER. EXTRACTED GROUNDWATER FROMNEW WELLS WILL BE TREATED AT THE EXISTING MAIN FACILITY REMEDIAL TREATMENT SYSTEM.

+

I't?L +_t-

MAIN FACILITYREMEDIAL SYSTEM

(TOWER 102)

WELL 17"

+-n-..

I

~

~

i..§~.

~.i~:;go~§

i~~f

Ji.,..,.;;:

t:fg~

~!

II""~~~~

'O~g~

~~!2.'!!2:'5';1E~I~IUCl x

FIGURE

6-4

ALTERNATIVE 5 - ALTERNATIVE 2 PLUSONE NEW REMEDIAL WELL AND

BWD PLANT 4 AS A REMEDIATION SYSTEMCONCEPTUAL SITE LAYOUT

PROPOSED SYSTEM EFFLUENT PIPELINE

PROPOSED REMEDIAL WELL



EXISTING SITE IRM REMEDIAL WELL








PUBLIC SUPPLY WELL


RECHARGE BASIN

u 500' 1200'

""' • FEET











*

I

*•-{;:(

NOTE:

1. ALTERNATIVE 2 PLUS NEW REMEDIAL WELL RW-20 PUMPING AT 500 GPM, AND THE TWO (2) BETHPAGEWATER DISTRICT (BWD) PLANT 4 WELLS PUMPING AT A COMBINED RATE OF 2,700 GPM TO REDUCE VOCMASS IN STUDY AREA GROUNDWATER. EXTRACTED GROUNDWATER FROM NEW WELL WILL BETREATED AT THE EXISTING MAIN FACILITY REMEDIAL TREATMENT SYSTEM. TREATED GROUNDWATERFROM BWD PLANT 4 WELLS WILL BE DISCHARGED TO A COMBINATION OF EXISTING RECHARGE BASINAND SHALLOW INJECTION WELLS LOCATED AT ARTHUR AVE. REPLACE BWD PLANT 4 CAPACITY.

-+'

&

PROPOSED PIPELINE CONNECTED"TO EXISTING SPARE PIPELINELOCATED ATWELL 19

Lo'oSWr WELL RW-20·T·

LEGEND:


iPROPOSED SYSTEM

,"'W,,,""~_

LOCATION OF BWD PLANT 4AS A REMEDIATION SYSTEMa.... ~\..

WELLBWD GM-38-RW-3

PLA"NT6V:. I~"

~"'--"'T-

1i' ARTHUR AVE BASIN<-: - AND INJECTION WELLS.. -

" PROPOSED SYSTEM~ ,', --t'V- • EFFLUENT PIPELINE \ .- '~ J

\ ~ t BWDj ~PLANT 5

o~

(Bf.-roo

~ ~

C-J L

-..

,.,,- 1

-~-,

I

~

~

i..§~.

~.i~:;go~§

i~~f

Ji.,..,.;;:

t:fg~

~!

II""~~~~

'O~g~

~~!2.'!!2:'5';1E~I~IUCl x

NOTE:

1. ALTERNATIVE 2 PLUS ATTEMPT TO RETURN STUDY AREA GROUNDWATER TO PRE-DISPOSALCONDITIONS USING FIVE (5) NEW REMEDIAL WELLS, SEVEN (7) OPERATING (SEVEN BACKUP) INJECTIONWELLS, AND FIVE (5) NEW REMEDIAL TREATMENT SYSTEMS.



FIGURE

6-5

ALTERNATIVE 6ALTERNATIVE 2 PLUS

FIVE NEW REMEDIAL WELLSCONCEPTUAL SITE LAYOUT

PROPOSED LOCATION OF INJECTION WELLS(ONE OPERATING/ONE BACKUP)

PROPOSED SYSTEM EFFLUENT PIPELINE

PROPOSED REMEDIAL WELL/TREATMENT SYSTEM


u 500' 1200'

""' • FEET







LEGEND:



PUBLIC SUPPLY WELL

RECHARGE BASIN



I

*

*tr



EXISTING MAIN FACILITY REMEDIAL TREATMENT SYSTEM(TOWER 102)"* EXISTING SITE IRM REMEDIAL WELL





PROPOSEDWELL IW-24

I't?

PROPOSED SYSTEMEFFLUENT PIPELINE(TYP.)

L .._t-

TOWERS 96 & 102DISCHARGE LOCATION

(SOUTH BASINS)

.....C§'-'z:

Q

'\

,

(

I

~

~

i..§~.

~.i~:;go~§

i~~f

Ji.,..,.;;:

t:fg~

~!

II""~~~~

'O~g~

~~!2.'!!2:'5';1E~I~IUCl x

Figureÿ6-6.ÿÿComparisonÿofÿModel-PredictedÿTVOCÿConcentrationsÿatÿBWDÿWellÿ4-1ÿbyRemedialÿAlternative,ÿ

StudyAreaÿFeasibilityStudy,ÿNorthropÿGrummanÿSystemsÿCorporation,ÿOperableÿUnitÿ3ÿ(FormerÿGrummanÿSettlingÿPonds),ÿBethpage,ÿNewÿYork.

G:\ENVCAD\Melville-NY\ACT\NY001496\0811\FS0D4\00006\7-6_7_8ÿComparisonÿofÿAlternativeÿPerformance.xlsxÿBWDÿ4-1

050100

150

200

250

300

350

400

450

05

1015

2025

30

TVOCÿConcentrationÿinÿmicrogamsÿperÿliterÿ(μg/L)

Timeÿ(years)

Alte

rnativeÿ2-

Baseline

Alte

rnativeÿ3

Alte

rnativeÿ4

Alte

rnativeÿ6

Figureÿ6-7.ÿÿComparisonÿofÿModel-PredictedÿTVOCÿConcentrationsÿatÿBWDÿWellÿ4-2ÿbyRemedialÿAlternative,ÿ



020406080100

120

140

160

180

200

05

1015

2025

30


Timeÿ(years)

Alte

rnativeÿ2-

Baseline

Alte

rnativeÿ3

Alte

rnativeÿ4

Alte

rnativeÿ6

Figureÿ6-8.ÿÿComparisonsÿofÿModel-PredictedÿTVOCÿConcentrationsÿatÿBWDÿWellÿ5-1ÿbyRemedialÿAlternative,ÿ



020406080100

120

140

160

180

200

05

1015

2025

30


Timeÿ(years)

Alte

rnativeÿ2-

Baseline

Alte

rnativeÿ3

Alte

rnativeÿ4

Alte

rnativeÿ5

Alte

rnativeÿ6

Date post:	16-May-2018
Category:	Documents
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