ACTIVITY NAME

Five Year Review forInstallation Restoration Sites1, 22, 26 and 28Former Naval Air StationMoffett Field

Restoration Advisory Board Meeting, February 12, 2015

Wilson Doctor, Navy Project Manager

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Presentation Overview

•Purpose and Objective

•Background

•Five Year Review Sites, Locations, and Background–IR Site 1

–IR Site 22

–IR Site 26

–IR Site 28

•Site Specific Findings & Protectiveness Statements

•Schedule

•Questions

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Purpose and Objective of Five Year Review

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Purpose

• Under CERCLA §121(c), the Navy is required to review the progress ofCERCLA remedies at federal installations where hazardous substancesremain on the site at levels that do not allow for unlimited use andunrestricted exposure. This must be done at a minimum frequency of everyfive years.

Objective

• The fundamental objective of the Five Year Review is to ensure continuingprotectiveness of the remedies.

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Background

Trigger Date for Five Year Reviews

• A Five Year Review schedule is triggered by the start of the first remedialaction that leaves hazardous substances, pollutants or contaminants on siteat levels that do not allow for unlimited use and unrestricted exposure.

• This is the third Five Year Review for IR Sites 22, 26, and 28, and the fourthfor IR Site 1.

• After completion of the Five Year Review, the trigger for subsequent reviewsis the date of the previous Five Year Review.

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IR Sites – Five Year Review

•The Navy issued a Draft Five Year Review report datedNovember 21, 2014 for the following sites:

–IR Site 1 (Runway Landfill)

–IR Site 22 (Golf Course Landfill)

–IR Site 26 (East-Side Aquifer Treatment System [EATS]Area)

–IR Site 28 (West-Side Aquifers Treatment System [WATS]Area)

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Former NAS Moffett Field Five YearReview Sites

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IR Site 1 – Runway Landfill

•Decision Document

- Record of Decision (ROD) completed in 1997

•Chemicals of Concern (COCs)

- Dissolved metals

- Volatile organic compounds (VOCs)

- Semivolatile organic compounds (SVOCs)

- Pesticides

- Polychlorinated bi-phenyls (PCBs)

•Remedy

- Consolidate Site 2 waste into Site 1

- Installed a multi-layer cap

- Semiannual groundwater and land fill gas monitoring

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IR Site 1 - Runway Landfill (continued)

•Remedy (cont.)

- Post-closure maintenance of cap

- Institutional Controls (ICs) and Engineering Controls (ECs)

•Current Status

- Quarterly landfill site inspections by Navy and Santa Clara CountyDepartment of Environmental Health (DEH)

- Groundwater and landfill gas monitoring

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IR Site 1 – Runway Landfill

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IR Site 22 – Golf Course Landfill

•Decision Document

- Record of Decision (ROD) completed in 2002

•COCs

- VOCs

- SVOCs

- Pesticides

•Remedy

- Landfill cover

- Institutional controls

- Groundwater and landfill gas monitoring

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IR Site 22 – Golf Course Landfill (continued)

•Current Status

- Quarterly landfill site inspections by Navy and Santa Clara DEH

- Groundwater and landfill gas monitoring

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IR Site 22 – Golf Course Landfill

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IR Site 26 – East-Side Aquifer Treatment System(EATS)

•Decision Document

- ROD completed in 1996

- ROD Amendment completed in September 2014

•COCs

- VOCs

- 1,2-dichloroethane (1,2-DCA)

- 1,2-dichloroethene (1,2-DCE)

- 1,1-dichloroethene (1,1-DCE)

- tetrachloroethene (PCE)

- trichloroethene (TCE)

•Remedy- Groundwater monitoring

- EATS (extraction and ex-situ treatment) 1999-2003

- ICs

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IR Site 26 – EATS (continued)

• Investigations

- 2003–2010 Treatability Studies

- Focused Feasibility Study completed in 2012

•Current Status

- Annual groundwater monitoring event (Sept/Oct) and biannual wellgauging (March and September)

- ROD Amendment for biostimulation/bioaugmentation, monitorednatural attenuation, and ICs

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IR Site 26 - EATS

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IR Site 28 – West-Side Aquifers Treatment System(WATS)

•Decision Documents

- ROD completed in 1989

- Vapor Intrusion ROD Amendment completed in 2010

•COCs

- TCE

- 1,2-DCE

- PCE

- Vinyl Chloride

•Remedy

- WATS (extraction and ex-situ treatment) treating groundwater

- Vapor intrusion

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IR Site 28 – WATS (cont.)

• Investigations

- 2010 Supplemental Investigation – Former Building 88 and TrafficIsland Area

- 2010-2011 In-situ Bioremediation Pilot Study

- 2012-2014 Vapor Intrusion (VI) evaluation

- 2013-2014 Groundwater investigation of deep aquifer

•Current Status

- WATS operating

- Groundwater monitoring events (March and October)

- Vapor intrusion assessment and mitigation

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IR Site 28 - WATS

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Components of Five Year Review

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Components of Five Year Review (continued)

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Assess Protectiveness

• A technical assessment is performed with the objective of answering thefollowing three questions:

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Draft Site Specific Findings & ProtectivenessStatements

•All sites are functioning or will be functioning as intended bytheir Record of Decision.

•Exposure assumptions, cleanup levels, and Remedial ActionObjectives used at the time of the remedies are still valid.

•No other information has come to light that could call intoquestion the protectiveness of the remedies.

•Remedies are protective of human health and the environment.

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Schedule

•Issued Draft Five Year Review – November 2014

•Review of Draft Five Year Review – current

•Issue Final Five Year Review

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Questions

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