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Hangar 1 Navy UpdateHangar 1 Navy Update

Restoration Advisory BoardRestoration Advisory BoardFormer NAS Moffett FieldFormer NAS Moffett Field

May 13, 2010 May 13, 2010

Kathryn Stewart, PEBRAC Environmental Coordinator

BRAC Program Management Office West

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Background Background –– Former NAS Moffett FieldFormer NAS Moffett Field

• Commissioned in 1933• Recommended for closure

in 1991• Transfer to NASA in 1994

– 1992 MOU• Navy responsible for

environmental restoration

Navy Photo

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Hangar 1Hangar 1

• Built in 1932 to house airship U.S.S. Macon

• 1,133 ft long, 308 ft wide, 198 ft high

• Contributing element to NAS Sunnyvale, CA Historic District

• Individually eligible for National Register

• Designated a “Navy historic site”

• Civil Engineering Landmark of Northern CA

Navy Photos

ChronologyChronology

• 1997- PCB contamination discovered in sediment

• Subsequently found in stormwater samples

• Determined a source was Hangar 1 in 2002

• Need to address source

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Navy Photos

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ChronologyChronology

• PCBs and asbestos within metal siding

• Metal siding and interior structure also painted with paint containing lead and PCBs

• Hangar closed for use in 2002 Navy Photo

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Cleanup ChronologyCleanup Chronology

• Identified as a CERCLA site, IR Site 29, in 2003

• Time Critical Removal Actions conducted in 2003– Cleaned out storm drain

sediments– Coated hangar with asphalt

emulsion

• Proceeded with Non-Time Critical Removal Action in 2005

Navy Photo

Engineering Evaluation/Engineering Evaluation/Cost Analysis (EE/CA)Cost Analysis (EE/CA)

• EE/CA drafted in May 2006– Recommended demolition

• Public Meeting – Late May 2006

• Structural Analysis and Seismic, Wind, and Gravity Study (July 2008)

• Revised EE/CA – July 2008• Public Meetings- Aug & Sep

2008

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Source: Moffett Users Website, www.nuqu.org

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Action MemorandumAction Memorandum

• Action Memorandum –December 2008

• Selected Alternative 10– Remove siding and

coat exposed surfaces• Contract awarded 25

September 2009– $22.3M

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ScheduleSchedule

• Work Plan approval Spring 2010• Start interior abatement/demolition Late Spring 2010• Start siding removal Winter 2010• Complete siding removal and coating Fall 2011• Complete confirmation sampling Fall 2011• Submit final report Winter 2012

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Other Considerations: HistoricOther Considerations: Historic

• National Historic Preservation Act– Section 106

• Coordination with Advisory Council on Historic Preservation (ACHP) and State Historic Preservation Office (SHPO)

• Removal Action Mitigation Measures– HAER documentation– Interactive CDs, Oral Histories– Preservation of Man Crane, etc.– Does not include re-siding

• Two undertakings– Navy’s Removal Action– NASA’s Reuse

Navy Photo

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Other Considerations: ResidingOther Considerations: Residing

• OMB Arbitration concluded March 2010– Navy - environmental cleanup actions– NASA - Hangar 1 reuse and residing

• Navy and NASA working together to determine the most appropriate path forward

• Investigating options for coordination• Recent Discussions – 27 April 2010• Recent Navy Correspondence

– To determine feasibility of combining under one contract, need plans, specs, funding

– Requirement for cleaning prior to new construction– Cannot delay removal action - interim coating showing signs of

failure– Lack of immediate plan not detrimental to Hangar frame

Other Considerations: Other Considerations: Deterioration/BirdsDeterioration/Birds

• Deterioration-– Structure in sound

condition– Coating service life of 20+

years– Proven at Vandenberg

launch tower– Routine inspection and

maintenance

• Roosting nest/bird air strike hazard-– BASH Mitigation– Temporary and permanent

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Photo of Hangar 1 Construction

Other Considerations: BiologicalOther Considerations: Biological

• Migratory Bird Treaty Act

• Burrowing Owl

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Other Considerations: Items for DeconOther Considerations: Items for Decon

• Navy allotted $75K in contract for decon of items identified by NASA

• List submitted by NASA and reviewed by contractor

• Includes various types of items

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Contact InformationContact Information

Kathy StewartBRAC Environmental CoordinatorBRAC Program Management Office West

Navy Caretaker Site Office1 Avenue of the Palms, Suite 161Treasure IslandSan Francisco, CA 94130-1807

Phone: (415)743-4715Fax: (415)743-4700

E-mail: Kathryn.Stewart@navy.mil

Backup Information

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Interim CoatingInterim Coating

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Interim CoatingInterim Coating

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36,000 ppm PCBs119 ppm PCBs

PCBs in SedimentPCBs in Sediment

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Upland PCBsUpland PCBs

• Navy addressing upland PCB Sources

• Aroclor 1260 • No Aroclor 1268

found

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