Presentation to the Moffett Restoration Advisory Board November 18, 2010: Petroleum Site 14 Update

1. WelcomeWelcome
Petroleum Site 14 UpdatePetroleum Site 14 Update
Former Naval Air StationFormer Naval Air Station
M ff tt Fi ldM ff tt Fi ldMoffett FieldMoffett Field
Wilson Doctor - Navy Project Manager
11/18/10 RAB meeting11/18/10 RAB meeting

2. Presentation OverviewPresentation Overview
• Site 14 background
Recent Site 14 activities• Recent Site 14 activities
• Site characteristics
• Upcoming cleanup activities
• Site strategy

3. Site 14 BackgroundSite 14 Background
• Former Department of Defense motor vehicle gasoline station
• Two former 5,000 gallon underground storage tanks (USTs)
removed in 1986
– Stored unleaded gasoline and diesel fuel
• 1986 to 2006: Navy conducted soil sampling groundwater• 1986 to 2006: Navy conducted soil sampling, groundwater
sampling, and treatability studies
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4. Recent Site 14 ActivitiesRecent Site 14 Activities
• 2008 to present: Additional sampling to characterize site
• March 2010: Discovered uncharacterized area of petroleum
constituents in groundwater
• June 2010: Conducted groundwater sampling
– Petroleum constituents related to Site 14Petroleum constituents related to Site 14
• Based on findings, air sparge treatment system design was modified to
treat this areatreat this area
– November 29: Begin field work
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5. Site CharacteristicsSite Characteristics
Extent of TPH-G
Concentrations
in Groundwater
Extent of Benzene
Concentrations in
Groundwater
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6. AirAir SpargingSparging))
• Inject air into the ground using air sparge
wells and an air compressor
• Injected air increases oxygen levels and
promotes biodegradation of petroleum
constituents in groundwater
• Sparge wells will inject air into sandy water-
bearing layer between 18 and 23 ft bgs to
achieve treatment
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• The system is expected to operate for one
year followed by a monitoring period

7. Well LocationsWell Locations
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8. Site StrategySite Strategy
S t
Biosparging System Operation
System
Operation/System
Optimization
Rebound
Within Acceptable
yes
no
no
Within Acceptable
Limits?
no
yes
Asymptotic
Conditions
Realized?
Remediation
Goals Achieved?
yes Shut Biosparging System
Down and Evaluate
ContaminantRebound
Implement MNA to
Achieve Cleanup Goals
Site Closure
Cleanup Goals
Achieved?
yes
8Monitored Natural Attenuation
no

9. Thank You!Thank You!
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