Appendix M: Installation Narrative Summaries - denix

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The mission of the former McClellan Air Force Base (AFB) was
to provide support for aircraft, missile, space, and electronics
programs. EPA placed the installation on the NPL in 1987 and
the Air Force signed an interagency agreement (IAG) in 1990.
In 1995, the BRAC Commission recommended the closure of
McClellan AFB. Environmental contamination at McClellan AFB
has resulted from sumps associated with industrial operations,
landfills, leaks from industrial waste lines, surface spills, and
underground storage tanks. Studies detected groundwater
contamination, leading to the closure of two on-base and three
off-base drinking water wells. In addition to 373 acres of
contaminated soil in the vadose zone, there are three large
plumes, totaling over 660 acres, consisting primarily of
trichloroethylene (TCE)-contaminated groundwater. The
installation converted its technical review committee to a
Restoration Advisory Board (RAB) in FY93. A BRAC cleanup
team (BCT) has been formed at this installation. Two 5-year
reviews have been completed for the NPL portion of the base
and one 5-year review has been completed for the Davis site,
which is located approximately 15 miles west of McClellan AFB.
Sites at the installation are grouped into 11 operable units
(OUs), including an installationwide groundwater OU. Interim
Records of Decision (RODs) have been signed for OU B 1 and
the groundwater OU and one soils ROD has been completed.
In addition, two no action RODs have been signed. To date, the
installation has transferred 387 acres. The cleanup progress at
McClellan AFB for FY02 through FY05 is detailed below.
In FY02, all groundwater and 14 soil vapor treatment systems,
covering 19 areas, operated effectively. A removal action at
PRL S 33 was completed. The time-critical removal action
(TCRA) continued at the large radiological CS 10 site.
Extensive work was completed on the initial parcel feasibility
study (FS), initial parcel finding of suitability for early transfer
(FOSET), and no action ROD. Two finding of suitability to
transfer (FOST) documents were completed, which allowed 177
acres to be deed transferred. A TCRA memorandum was
signed and a corrective action was initiated to address
hexavalent chromium issues at the groundwater treatment
plant. The RAB continued to meet regularly.
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In FY03, the installation completed the TCRA for the hexavalent
chromium treatment system and the six site no action ROD.
The TCRA at CS 10 resulted in the excavation of over 51,000
cubic yards of contaminated soil, with approximately one-third
of the excavated soil remaining safely on site. Operation of
groundwater and soil vapor treatment systems continued.
In FY04, the installation completed the local redevelopment
authority (LRA) Initial Parcel #1 ROD and associated FOSET
and FOST for 82 acres. A total of 154 acres were transferred by
deed. The interim ROD groundwater Phase III off-base design
was completed and the interim ROD groundwater Phase III
on-base design began. The installation completed the second
5-year review for the NPL portion of the base and also
completed the 5-year review for the Davis site. The Air Force
conducted an inventory of Military Munitions Response
Program (MMRP) sites. MMRP sites were identified at this
installation.
In FY05, the installation completed construction of the Phase III
groundwater system. The installation awarded the Davis site
cleanup guaranteed firm-fixed price contract to achieve site
closeout. The Air Force began evaluating requirements at
MMRP sites at this installation. BCT activities and active RAB
participation continued.
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McClellan AFB completed remedial actions for two of the three
action sites in the LRA Initial Parcel #1 ROD. The installation
continued to operate the biovent system at the third action site
in the LRA Initial Parcel #1 ROD. The Air Force completed the
focused strategic sites FS. The installation completed the
agreement on a new flow, fate, and transport model, minimizing
the time required for cleanup. The installation streamlined the
groundwater treatment system. The Air Force continued the soil
vapor extraction (SVE) program, and accelerated cleanup by
expanding the number of treatment systems from 14 to 16 to
increase contaminant extraction capacity. The installation
conducted verification sampling and completed initial
negotiations with regulators to close a completed SVE site. The
cost of completing environmental restoration has changed
significantly due to technical issues and changes in estimating
criteria.
Regulatory issues delayed the LRA Initial Parcel #2 ROD.
Technical issues delayed the Breakout Shallow Soil Gas ROD.
BCT activities and active RAB participation continued.
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McClellan AFB continued to evaluate MMRP requirements and
identified two MMRP sites: the former Skeet Range and a
suspected discarded military munitions (DMM) landfill site.
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Plan of action items for McClellan Air Force Base are grouped
below according to program category.
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0 Complete the focused strategic sites ROD in
FY07-FY08.
0 Resolve issues with regulators on shallow
soil gas and complete the LRA Initial Parcel
#2 ROD in FY07-FY08.
0 Complete the volatile organic compound (VOC)
groundwater ROD and its operating properly
and successfully determination in FY07-FY08.
0 Complete the 62-acre privatization pilot
project in FY07-FY08.
0 Complete the LRA Initial Parcel #3 FS in
FY07-FY08.
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0 Complete the intrusive field investigation of
the DMM site in FY07-FY08.
0 Closeout the DMM site based on field
investigation results, or add site to Small
Volume Site ROD in FY07-FY08.
0 Closeout the former Skeet Range site with no
further action as part of the focused
strategic sites ROD in FY07-FY08.
M-127