Presentation to the Moffett Field Restoration Advisory Board May 13, 2010: Hangar One Update, Kathryn Stewart, Navy

1. Hangar 1 Navy Update
Restoration Advisory Board
Former NAS Moffett Field
May 13, 2010
Kathryn Stewart, PE
BRAC Environmental Coordinator
BRAC Program Management Office West
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2. Background – Former 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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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
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4. Chronology
• 1997- PCB contamination
discovered in sediment
• Subsequently found in
stormwater samples
• Determined a source was
Hangar 1 in 2002
• Need to address source
Navy Photos
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5. Chronology
• 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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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
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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
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8. Action 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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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
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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
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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
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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
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13. Other Considerations: Biological
• Migratory Bird Treaty
Act
• Burrowing Owl
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14. Other 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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15. Contact Information
Kathy Stewart
BRAC Environmental 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
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16. Backup Information
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17. Interim Coating
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18. Interim Coating
36,000 ppm
PCBs
119 ppm PCBs
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19. PCBs in Sediment
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20. Upland PCBs
• Navy addressing
upland PCB Sources
• Aroclor 1260
• No Aroclor 1268
found
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