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Moffet Field RAB Hangar 1 Update
Hangar 1, a historical site from the former NAS Moffett Field, has been under environmental restoration due to contamination issues including PCBs and asbestos. The Navy has developed a cleanup plan, which includes demolition and siding removal, initiated in 2010, with ongoing coordination with NASA regarding the hangar's future use. Historic preservation considerations and biological factors, such as migratory birds, are also being addressed in the restoration process.
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Moffet Field RAB Hangar 1 Update
- 1. Hangar 1 NavyUpdate Restoration Advisory Board Former NAS Moffett Field May 13, 2010 Kathryn Stewart, PE BRAC Environmental Coordinator BRAC Program Management Office West 1
- 2. Background – FormerNAS Moffett Field • Commissioned in 1933 • Recommended for closure in 1991 • Transfer to NASA in 1994 – 1992 MOU • Navy responsible for environmental restoration Navy Photo 2
- 3. Hangar 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 Navy Photos • Individually eligible for National Register • Designated a “Navy historic site” • Civil Engineering Landmark of Northern CA 3
- 4. Chronology • 1997- PCBcontamination discovered in sediment • Subsequently found in stormwater samples • Determined a source was Hangar 1 in 2002 • Need to address source Navy Photos 4
- 5. Chronology • PCBs andasbestos within metal siding • Metal siding and interior structure also painted with paint containing lead and PCBs • Hangar closed for use in 2002 Navy Photo 5
- 6. Cleanup 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 Navy Photo 2005 6
- 7. Engineering Evaluation/ 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 Source: Moffett Users Website, www.nuqu.org 2008 7
- 8. Action Memorandum • ActionMemorandum – December 2008 • Selected Alternative 10 – Remove siding and coat exposed surfaces • Contract awarded 25 September 2009 – $22.3M 8
- 9. Schedule • 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 9
- 10. Other 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 10
- 11. Other 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 11
- 12. Other Considerations: Deterioration/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- Photo of Hangar 1 Construction – BASH Mitigation – Temporary and permanent 12
- 13. Other Considerations: Biological •Migratory Bird Treaty Act • Burrowing Owl 13
- 14. Other Considerations: Itemsfor 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 14
- 15. Contact Information Kathy Stewart BRACEnvironmental Coordinator BRAC Program Management Office West Navy Caretaker Site Office 1 Avenue of the Palms, Suite 161 Treasure Island San Francisco, CA 94130-1807 Phone: (415)743-4715 Fax: (415)743-4700 E-mail: Kathryn.Stewart@navy.mil 15
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- 18. Interim Coating 36,000 ppm PCBs 119 ppm PCBs 18
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- 20. Upland PCBs • Navy addressing upland PCB Sources • Aroclor 1260 • No Aroclor 1268 found 20