Appendix M: Installation Narrative Summaries - denix
Appendix M: Installation Narrative Summaries - denix
Appendix M: Installation Narrative Summaries - denix
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EPA placed Williams Air Force Base (AFB) on the NPL in 1989,<br />
and the Air Force signed a federal facility agreement (FFA) in<br />
FY90. In July 1991, the BRAC Commission recommended<br />
closure of the installation. The installation closed in September<br />
1993. Sites identified at the installation include the liquid fuels<br />
storage area, Fire Protection Training Area No. 2, a collapsed<br />
stormwater line, and the old pesticide/paint shop. The<br />
installation updated the BRAC cleanup plan in FY97 and FY05.<br />
The Air Force completed a 5-year review in FY01.<br />
Before base closure, environmental studies identified 15 sites.<br />
These sites were consolidated into three operable units (OUs).<br />
In FY93, an environmental assessment of 30 additional areas<br />
resulted in the creation of two more OUs, including 17 new<br />
<strong>Installation</strong> Restoration Program (IRP) sites. A sixth OU was<br />
created by consensus statement. To date, Records of Decision<br />
(RODs) have been signed for OUs 1 through 5. Approximately<br />
3,856 acres have been transferred to date. The cleanup<br />
progress at Williams AFB for FY02 through FY05 is detailed<br />
below.<br />
In FY02, groundwater monitoring continued at OU 1 Landfill<br />
(LF) 004, OU 2 Site ST 012, and compliance site Building 760.<br />
The installation agreed to take more aggressive remedial<br />
actions at ST 012 and drafted an explanation of significant<br />
differences for the OU 2 ROD accordingly. The installation<br />
continued the removal action (landfarming of contaminated<br />
soils) at Spill Site 17 (SS 017).<br />
In FY03, the Air Force continued groundwater monitoring at OU<br />
1 LF 004, OU 2 Site ST 012, and compliance site Building 760,<br />
and initiated groundwater monitoring at OU 6 SS 017. In<br />
preparation for innovative thermal enhanced extraction (TEE)<br />
treatment at OU 2 Site ST 012, the installation obtained<br />
regulatory concurrence on a detailed conceptual site model of<br />
the complex site geology and facilitated a peer review of<br />
thermal technology through Arizona State University. The<br />
installation initiated an evaluation of the landfarming removal<br />
action at SS 017.<br />
In FY04, the installation transferred 39 acres and planned for<br />
the construction and operation of the initial phase of TEE at OU<br />
2 Site ST 012. The installation also conducted an engineering<br />
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evaluation and cost assessment for the Bullet Fragment area of<br />
concern (AOC). Regulators continued to review the OU 6 ROD.<br />
The Air Force conducted an inventory of Military Munitions<br />
Response Program (MMRP) sites. MMRP sites were identified<br />
at this installation.<br />
In FY05, the installation completed a removal action at the<br />
Bullet Fragment AOC and restored the site. The Air Force<br />
began evaluating requirements at MMRP sites at this<br />
installation.<br />
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Williams AFB initiated a thermal treatability study (TS) pilot at<br />
OU 2 (Site ST 012) and initiated construction. The Air Force<br />
installed additional groundwater monitoring wells and awarded<br />
a supplemental investigation at OU 1 (LF 004). The cost of<br />
completing environmental restoration has changed significantly<br />
due to technical issues, regulatory issues, and changes in<br />
estimating criteria.<br />
Technical issues delayed amending the OU 2 ROD.<br />
Administrative issues delayed property transfer and the OU 6<br />
ROD. The installation submitted the draft 5-year review to<br />
regulators; however, scheduling issues delayed completion.<br />
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Williams AFB continued to evaluate requirements for MMRP<br />
sites.<br />
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Plan of action items for Williams Air Force Base are grouped<br />
below according to program category.<br />
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0 Complete construction and implementation of<br />
pilot TS at OU 2 (Site ST 012) in FY07-FY08.<br />
0 Complete a ROD amendment for OU 3 (Site FT<br />
002) and a ROD for OU 6 (SS 017) in<br />
FY07-FY08.<br />
0 Conduct fieldwork for the supplemental<br />
investigation at OU 1 (LF 004) in FY07-FY08.<br />
0 Conduct long-term management at OU 1 (LF 004)<br />
and remedial action operations OU 2 (Site ST<br />
012) in FY07-FY08.<br />
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0 Implement guidance on the inventory of MMRP<br />
sites and evaluate the potential for other<br />
sites in FY07-FY08.<br />
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M-208
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