1. Five-Year Review Report
for Sites 1, 22, 26 and 28
Restoration Advisory Board
Former Naval Air Station Moffett Field
May 13, 2010
Wilson Doctor
Navy Project Manager
2. Five-Year Review Report
• Previous Five-Year Review Reports
– Site 1 Landfill 2002 and 2007
– Site 22 Landfill 2008
– Site 26 East Side Aquifers Treatment System (EATS) 2005
– Site 28 West Side Aquifers Treatment System (WATS) 2005
• 2010 Five-Year Review Report Schedule
– Draft report issued October 15, 2009
– Agency comments received mid-December
– Final February 12, 2010
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3. CERCLA Sites 1, 22, 26, and 28
Former NAS Moffett Field, CA
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4. Five-Year Review: Sites 1, 22, 26, and 28
Sites 1 and 22 Landfills
• Site 1 Record of Decision 1997
• Site 22 Record of Decision 2002
Landfill Remedies
• Construction and maintenance of landfill covers
• Groundwater and landfill gas monitoring
• Institutional controls (ICs)
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5. Five-Year Review: Sites 1, 22, 26, and 28
Sites 1 and 22 Landfills
Findings
• Landfill remedies are currently protective
– Landfill covers are functioning as intended
– Groundwater contaminant concentrations stable
– Landfill gas concentrations below threshold at landfill boundaries
Issue
• Need to complete institutional controls
Follow-up actions
• Incorporate institutional controls into NASA Ames land use planning
documents
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6. Five-Year Review: Sites 1, 22, 26, and 28
Site 26 East-side Aquifers Treatment System (EATS)
• Record of Decision 1996
Site 26 Remedy
• Groundwater extraction and treatment
• Groundwater monitoring
• Institutional controls
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7. Five-Year Review: Sites 1, 22, 26, and 28
Site 26 East-side Aquifers Treatment System (EATS)
• EATS operational 1999 to 2003
• 2003 to present EATS turned off to evaluate alternative treatment
methods
Findings
• Site 26 remedy is currently protective
– Although EATS has remained off, the groundwater contaminant
plumes are stable or decreasing
Issues
• Need to complete institutional controls
• EATS inefficient and ineffective treatment method
Follow-up Actions
• Incorporate institutional controls in NASA Ames land use planning
documents
• Continue implementing pilot test 7
8. Five-Year Review: Sites 1, 22, 26, and 28
Site 28 West-side Aquifers Treatment System (WATS)
• Record of Decision
– In 1993, Navy adopted EPA 1989 MEW ROD
Site 28 Remedy
• Groundwater extraction and treatment
• Remediation of unsaturated soil
• Groundwater monitoring
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9. Five-Year Review: Sites 1, 22, 26, and 28
Site 28 West-side Aquifers Treatment System (WATS)
• WATS operating 1998 to present
• Evaluating alternative treatment methods
Findings
• Site 28 remedy is currently protective
– WATS is functioning as intended
– Groundwater contaminant plumes are stable or decreasing
– No short-term health risks
– NASA implementing mitigation measures for vapor intrusion
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10. Five-Year Review: Sites 1, 22, 26, and 28
Site 28 West-side Aquifers Treatment System (WATS)
Issues
• Potential actions needed to ensure long-term protectiveness from vapor
intrusion
• The challenge of treating onsite and upgradient groundwater VOC sources
Follow-up Actions
• Incorporate ICs related to vapor intrusion in NASA Ames internal directive &
Incorporate relevant measures of EPA vapor intrusion pathway study in
NASA Ames construction permit process for buildings
• Continue to implement pilot test and to participate in a regional strategy to
address groundwater contamination
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