Appendix M: Installation Narrative Summaries - denix

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George Air Force Base (AFB) provided tactical fighter
operations support. The 1988 BRAC Commission
recommended closure of George AFB. In December 1992, the
installation closed. EPA placed the installation on the NPL in
February 1990 and the Air Force signed a federal facility
agreement (FFA) in October 1990. Environmental studies
conducted at George AFB have identified the following site
types: landfills, petroleum spill sites, underground storage tanks
(USTs), waste storage and disposal units, and fire training
areas. Interim actions at the installation have included removal
of more than 80 USTs and contaminated soil, and cleanup and
closure of a hazardous waste storage yard. In FY92, the
installation formed a BRAC cleanup team (BCT) and converted
its technical review committee to a Restoration Advisory Board
(RAB). The installation completed 5-year reviews in FY01 and
FY06.
Sites have been grouped into five operable units (OUs). OU 2,
the fuels and pesticide sites, has been removed from CERCLA.
To date, Records of Decision (RODs) have been signed for
OUs 1 and 3. The cleanup progress at George AFB for FY02
through FY05 is detailed below.
In FY02, the geologic conceptual site model (CSM) for the OU
1 groundwater treatment system and the draft OU 2 remedial
investigation and feasibility study were completed. Funding was
approved for the removal of polyaromatic hydrocarbons (PAHs)
and lead shot at the second skeet range.
In FY03, the Air Force and EPA agreed on a risk-based closure
of the second skeet range to unrestricted usage of the property.
A remedial process optimization study was conducted in
November 2002 to identify opportunities for enhancing the
effectiveness and efficiency of remediation efforts.
In FY04, George AFB completed the hydrogeologic CSM for
the OU 1 groundwater treatment system. The installation
completed aquifer testing and is using the information to update
the CSM. The installation converted three monitoring wells to
extraction wells to enhance the cleanup systems for the OU 1
treatment system. At OU 2, the Air Force continued to remove
over 20,000 pounds of petroleum vapor per month and average
over 1,000 gallons of free product per month. At OU 3, the Air
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Force continued to operate several soil cleanup systems. In
addition, landfill monitoring and landfill cap maintenance
continued. The Air Force conducted an inventory of Military
Munitions Response Program (MMRP) sites. MMRP sites were
identified at this installation.
In FY05, the installation shut down the bioventing system at
Site WP 017. The remedial equipment was decommissioned
and removed from the former site. The installation continued
operating the treatment systems at OUs 1, 2, and 3, and
continued landfill monitoring and landfill cap maintenance. The
Air Force established OU 4, which included nine areas of
concern. The OU 1 groundwater treatment system remained in
standby mode while groundwater fate and transport modeling
was conducted. The Air Force initiated preparation of the
second 5-year review. The OU 2 fuel plume was removed from
the interagency agreement; remediation continued under the
State corrective action program. The Air Force began
evaluating requirements at MMRP sites. The BCT met
frequently and the RAB held an annual meeting.
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George AFB continued groundwater modeling for OU 1. The
installation conducted preliminary fate and transport scenarios.
Additionally, OU 5 was identified, which consisted of two
volatile organic compound (VOC) sources found in the soil. Soil
vapor extraction (SVE) systems were installed as interim
remedies at both sites. Free product recovery and SVE
continued at the non-CERCLA fuel site. The installation
completed a 5-year review. The cost of completing
environmental restoration has changed significantly due to
technical issues, regulatory issues, and changes in estimating
criteria.
The installation submitted the proposed plan for the OU 4 ROD
to regulators; however, EPA delayed its approval pending a
focused feasibility study. Administrative issues delayed
completion of the OU 2 corrective action plan (CAP).
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The installation cleared and closed the explosive ordnance
disposal Proficiency Training Area.
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Plan of action items for George Air Force Base are grouped
below according to program category.
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0 Finalize the OU 4 ROD in FY07.
0 Fill data gaps for non-CERCLA fuel and
pesticide contamination sites and develop
CAPs in FY07-FY08.
0 Continue to operate existing SVE systems and
monitor the groundwater in FY07-FY08.
0 Complete groundwater modeling and identify an
appropriate long-term remedy for OU 1 in
FY07-FY08.
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0 Obtain administrative closure for eight MMRP
sites in FY07-FY08.
M-90