Appendix M: Installation Narrative Summaries - denix

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In July 1987, Mather Air Force Base (AFB) was placed on the
NPL. The BRAC Commission recommended closure in
December 1988 and the installation signed an interagency
agreement (IAG) the following year. Before becoming inactive
in FY93, the installation housed the 323rd Flying Training Wing,
a Strategic Air Command (SAC) wing, a Reserve air refueling
group, and an Army National Guard aviation unit. Site types
include landfills, underground storage tanks (USTs), fire training
areas, a trichloroethylene (TCE) disposal site, a weapons
storage area, wash rack areas, spill areas, and waste pits.
Interim actions included removing USTs and contaminated soil,
supplying an alternate water supply for nearby residents,
removing sludge from a former wastewater treatment plant,
removing petroleum product by soil vapor extraction (SVE), and
excavating pesticide contamination from drainage ditches. In
FY94, a Restoration Advisory Board (RAB) and a BRAC
cleanup team (BCT) were formed. In FY01, removal actions at
Sites 80 (ST 080), 85 (DD 085), 88 (SD 088), and 89 (OT 089)
were completed except for reclamation and reporting. The
installation also completed the draft remedial action report
(RAR) for Site 15 (SD 015) and the RAR for Site 62 (OT 062).
The installation completed 5-year reviews in FY00 and FY05.
Studies have identified 89 Installation Restoration Program
(IRP) sites at the installation, which were grouped into 6
operable units (OUs): OU 1, Aircraft Control and Warning Site;
OU 2, Groundwater; OU 3, Soil; OU 4, Landfill; OU 5,
Basewide; and OU 6, Supplemental Basewide. To date,
Records of Decision (RODs) have been approved for OUs 1
through 6. The cleanup progress at Mather AFB from FY02
through FY05 is detailed below.
In FY02, construction was completed for the Phase IV
groundwater remediation, and capture was expanded into
additional baseline areas. The Phase V project was planned to
evaluate the performance of the Phase IV extraction system, as
well as recommend the necessity of further extraction and any
additional cost-reducing enhancements. Sites 19 (WP 019), 56
(SD 056), and 60 (SD 060), as well as Facilities 2595 and
18015 (ST 075) completed in situ vadose-zone treatment.
RARs were completed for Sites 56 and 60 and the northeast
plume. Closure letters from the Regional Water Quality Control
Board were obtained for eight IRP sites and five UST sites. The
Air Force
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installation also underwent the performance and protectiveness
review, and remedial process optimization (RPO) evaluation.
In FY03, the installation began two performance and
protectiveness reviews/RPO evaluations: one for groundwater
monitoring, and one for groundwater remediation. RARs were
completed for Sites 69 (OT 069) and 86 (FR 086). The
installation discovered additional buried debris and fuel
contamination at Site 10C/68 (FT 010/ST 068).
In FY04, Mather AFB installed a new extraction well near the
toe of the main base/SAC area plume. One injection well was
redeveloped and two extraction wells were replaced. A
reduction of groundwater sampling frequency reduced
operation and maintenance costs. The installation initiated the
closure process for two CERCLA and two non-CERCLA sites.
The Air Force conducted an inventory of Military Munitions
Response Program (MMRP) sites. MMRP sites were identified
at this installation.
In FY05, the installation began operating the new extraction
well near the toe of the main base/SAC Area plume. Existing
groundwater, SVE, and treatment systems continued to
operate. The Air Force completed the second 5-year review
report and obtained concurrence. The Air Force began
evaluating requirements at MMRP sites at this installation. RAB
and BCT activities continued.
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Mather AFB continued to operate existing groundwater, SVE,
and treatment systems. The Air Force continued to collect site
information on the remaining 13 active SVE sites. The
installation completed the final OU 6 ROD and attained the last
remedy in place milestone. The cost of completing
environmental restoration has changed significantly due to
changes in estimating criteria.
The installation began reinstallation of the groundwater
remediation system at Site WP 007; however, scheduling
issues delayed completion.
RAB and BCT activities continued.
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The installation continued to evaluate requirements at MMRP
sites.
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Plan of action items for Mather Air Force Base are grouped
below according to program category.
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0 Install an additional extraction well at
southwest lobe of Main Base Plume to contain
plume in FY07.
0 Complete reinstallation of the groundwater
remediation system at Site WP 007 in FY07.
0 Conduct lead removal action at Site FT 010C
in FY07.
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0 Conduct MMRP investigation and closure of
Practice Grenade Range in FY07.
M-125