WelcomeWelcome

Petroleum Site 14 UpdatePetroleum Site 14 Update

Former Naval Air StationFormer Naval Air StationM ff tt Fi ldM ff tt Fi ldMoffett FieldMoffett Field

Wilson Doctor - Navy Project Manager11/18/10 RAB meeting11/18/10 RAB meeting

Presentation OverviewPresentation Overview

• Site 14 background

Recent Site 14 activities• Recent Site 14 activities

• Site characteristics

• Upcoming cleanup activities

• Site strategy

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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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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Site CharacteristicsSite Characteristics

Extent of TPH-G Concentrations in Groundwater

Extent of Benzene Concentrations in

Groundwater

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Air Air SpargingSparging))

• Inject air into the ground using air spargewells 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

Well LocationsWell Locations

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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

Contaminant Rebound

Implement MNA to Achieve Cleanup Goals Site ClosureCleanup Goals

Achieved?

yes

8Monitored Natural Attenuation

no

Thank You!Thank You!

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