Appendix M: Installation Narrative Summaries - denix

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Bergstrom Air Force Base (AFB) began operations in 1942,
maintaining troop carrier units. In July 1991, the BRAC
Commission recommended closure of the installation and
retirement of the assigned RF-4 aircraft. The installation closed
in late FY93, and the local redevelopment authority (LRA)
began to convert the installation to a civilian airport. Site types
identified at the base include underground storage tanks
(USTs), landfills, fuel spill areas, a pesticide evaporation pit,
firing ranges, a sludge weathering pit, aboveground storage
tanks (ASTs), oil/water separators, a fire training area, and a
radioactive waste disposal area. Interim remedial actions (RAs)
have included removal of 106 USTs, removal of contaminated
soil and low-level radioactive wastes, and closure of 45 ASTs.
A BRAC Cleanup Team (BCT) and a Restoration Advisory
Board (RAB) were formed in FY94. The RAB was disbanded in
FY97 because of the successful remediation efforts at the
installation. Also in FY97, the latest Environmental Baseline
Survey (EBS) was completed. The installation updated the
community relations plan (CRP) in FY05 and completed the first
5-year review in FY06.
Environmental studies since FY83 have identified 30 CERCLA
sites and 454 RCRA areas of concern (AOCs). To date, 478 out
of a total of 484 sites and AOCs have been designated for no
further action and all 3,197 acres have been transferred to the
LRA. The cleanup progress at Bergstrom AFB for FY02 through
FY05 is detailed below.
In FY02, the installation submitted a deed certification for Solid
Waste Management Unit (SWMU) 216 to regulatory agencies
for approval. The installation also submitted a finding of
suitability to transfer (FOST) and supplemental EBS (SEBS) for
five sites, and incorporated regulator comments. The
pump-and-treat, air sparging, and soil vapor extraction (SVE)
systems for the trichloroethylene (TCE) groundwater plume
operated throughout the year, which lowered TCE plume levels
from an average of 230 parts per billion (ppb) to an average of
35 ppb. The semiannual long-term monitoring of the combined
Southeast Landfills (LFs) 3 through 7 (56 acres) was completed
and included cutting the grass, repairing erosion as necessary,
and inspecting the RCRA landfill caps to ensure their integrity
was maintained. The BCT met to determine a cleanup strategy
based upon the TCE plume remediation systems results. An
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Explosive Ordnance Disposal (EOD) RA project was conducted
to clear 200 anomalies that were identified during the
investigative project. A draft final report for the EOD RA project
was submitted for review and comment.
In FY03, the Air Force began processing the FOST/SEBS for
the SWMU 76 Area 2 TCE plume (SS 032). Operation of the
existing pump-and-treat, air sparging, and SVE remediation
systems continued for the SWMU 76 Area 1 TCE Plume (SS
031). Long-term management (LTM) continued for the
combined Southeast LFs 3 through 7 and documentation was
developed to achieve operating properly and successfully
(OP&S) determinations for the five sites. The EOD area (56
acres) Residential Clearance Certification was submitted to the
Air Force Safety Center for processing, and to the DoD
Explosive Safety Board (DDESB) for their review and approval.
The DDESB safety clearance was approved, allowing for
transfer of the EOD area.
In FY04, the installation transferred 161 acres. The Air Force
produced SEBS, FOST, and deed for the 56-acre EOD area
and the 59-acre SWMU 76 Area 2 TCE plume. Both properties
were transferred to the City of Austin. Bergstrom AFB prepared
FOST and OP&S documents for the combined Southeast LFs 3
through 7 and the SWMU 76 Area 1 TCE Plume. Operation and
maintenance (O&M) and LTM were conducted for the combined
Southeast LFs 3 through 7 and the Area 1 TCE plume. The Air
Force conducted an inventory of Military Munitions Response
Program (MMRP) sites. MMRP sites were identified at this
installation.
In FY05, the installation obtained EPA approval of the FOST
and OP&S documents for the SWMU 76 Area 1 TCE plume
and the combined Southeast LFs 3 through 7. The Air Force
transferred the remaining two parcels (361 acres), and
deactivated the SWMU 76 Area 1 SVE systems. O&M and LTM
for the combined Southeast LFs 3 through 7 and the Area 1
TCE plume continued under a fixed-price remediation contract.
The installation updated the CRP to indicate the status of
remediation efforts and identify ongoing opportunities for
community involvement. The Air Force completed the draft of
the first 5-year review and submitted it for signature. The Air
Force began evaluating requirements at MMRP sites at this
installation.
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Bergstrom AFB completed the first 5-year review, which
concluded that all remedies remaining at the base continue to
be protective of human health and the environment. The
installation awarded the annual regional fixed-price contract to
continue O&M and LTM for the combined Southeast LFs 3
through 7, and the SWMU 76 Area 1 TCE plume continued
under a regional fixed-price remediation contract. Bergstrom
AFB deactivated the SWMU 76 air sparge system and collected
quarterly hot spot groundwater samples to demonstrate no
rebound in TCE concentrations as a result of system
deactivation.
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The installation completed evaluation of MMRP sites.
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Plan of action items for Bergstrom Air Force Base are grouped
below according to program category.
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0 Award the annual regional fixed-price
contract to continue LTM and O&M of the
combined Southeast LFs 3 through 7 and the
SWMU 76 Area 1 TCE plume in FY07.
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0 Prepare and submit documentation to DDESB to
obtain administrative closure for seven MMRP
sites in FY07.
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