Appendix M: Installation Narrative Summaries - denix

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Larson Air Force Base (AFB) served as a Tactical Air
Command base, then as a military air transport facility, and
later as a Strategic Air Command base. The property was sold
to the Port of Moses Lake in 1966 and is now operated by the
Grant County Airport. Much of the former Larson AFB property
served as a regional aviation, industrial, and educational facility.
Environmental assessments, beginning in FY87, identified 4
sites that required further investigation: 11 underground storage
tanks and associated potentially contaminated soil, a
trichloroethylene (TCE)-contaminated groundwater plume, an
area potentially containing low-level radioactive waste, and 2
disposal areas potentially containing tetraethyl lead. EPA
placed the property on the NPL in October 1992, and the Army
and EPA signed an interagency agreement (IAG) in March
1999. The U.S. Army Corps of Engineers (USACE) established
a Restoration Advisory Board at this property.
USACE has identified four projects at this property. The
cleanup progress for Moses Lake for FY02 through FY05 is
detailed below.
In FY02, USACE initiated the interim remedial action to
construct and provide a replacement well for the community of
Skyline. The supplemental remedial investigation (RI) work was
scoped, awarded, and coordinated. USACE published a draft
RI report, with several field sites requiring more investigation.
In FY03, USACE completed the Skyline well replacement
project and handed the well over to the owner. USACE
completed the final RI report. USACE began a long-term
management (LTM) program for domestic well owners on the
southern edge of the plume. EPA continued to be an active
participant in the restoration process and partnered with
USACE and the public during all phases of the project.
In FY04, USACE continued the LTM program for domestic well
owners to determine the impact of TCE in groundwater to
residents with private wells in Moses Lake. USACE completed
planning and initiated the execution of the nature and extent
investigation (NEI) of TCE in the groundwater at Moses Lake.
The IAG required the NEI as a supplement to the completed RI.
USACE continued the surface soil operable unit (OU) feasibility
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study (FS). The groundwater OU FS preliminary work
continued.
In FY05, USACE completed the NEI of TCE in groundwater at
Moses Lake. The LTM/whole-house filter program for residents
with private wells in Moses Lake continued. USACE completed
the draft versions of the groundwater OU FS and shallow soils
OU FS and submitted the FSs to EPA. USACE submitted all
deliverables required in the IAG between USACE and EPA.
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USACE provided ongoing litigation support to the Department
of Justice regarding this property, and continued to work with
EPA in support of the proposed plan (PP) and Record of
Decision (ROD) process. Filters placed by USACE under the
LTM/ whole house filters program continued to operate for
residents with affected private wells in Moses Lake. USACE
revised the groundwater and shallow soils FSs; however,
regulatory issues delayed its final acceptance.
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USACE completed a draft Archives Search Report for the
project.
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Plan of action items for Moses Lake Wellfield Contamination
Site are grouped below according to program category.
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0 Continue to work with EPA and support the
proposed plan/ ROD process in FY07.
0 Revise groundwater FS and shallow soils FS as
necessary in FY07.
0 Continue LTM / whole-house filter program for
residential wells in FY07.
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There are no MMRP actions scheduled for FY07 or
FY08.
M-133
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