Appendix M: Installation Narrative Summaries - denix
Appendix M: Installation Narrative Summaries - denix
Appendix M: Installation Narrative Summaries - denix
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Edwards Air Force Base (AFB) conducts aerospace research,<br />
development, testing, and evaluation, and provides support to<br />
the United States and its allies. In August 1990, EPA placed the<br />
installation on the NPL and in FY90, the Air Force signed a<br />
federal facility agreement (FFA). In 2005, the BRAC<br />
Commission recommended Edwards AFB for realignment.<br />
Interim remedial actions have included installing groundwater<br />
treatment systems to remove JP-4 jet fuel and solvents,<br />
removing over 350 underground storage tanks and numerous<br />
drums of hazardous waste, stabilizing soil to immobilize dioxin<br />
and heavy metals, capping the firefighting training facility,<br />
bioventing contaminated soil at 12 sites, and installing 7 soil<br />
vapor extraction treatment systems. The installation formed a<br />
Restoration Advisory Board (RAB) in 1995.<br />
Studies have identified 461 sites and areas of concern (AOCs)<br />
that are divided into 10 operable units (OUs). Fifty sites are in<br />
the study phase; 21 sites are in the cleanup, operations,<br />
construction, Record of Decision (ROD), or decision document<br />
stages; 1 site is in long-term monitoring; and 389 sites and<br />
AOCs require no further investigation. Over 1.9 million pounds<br />
of contaminants have been recycled or destroyed to date. The<br />
cleanup progress at Edwards AFB for FY02 through FY05 is<br />
detailed below.<br />
In FY02, the installation completed the work plan, design<br />
documents, and procurement activities for the Site 285<br />
full-scale treatability study (TS) for perchlorate. The installation<br />
field tested in-well sensor technologies for remote monitoring of<br />
remediation sites. Four trenches at Site 426 were excavated<br />
and no chemical warfare agent-impacted soil or debris were<br />
encountered. A successful steam-injection TS was performed<br />
at Site 61. Sixteen sites and AOCs achieved site closeout (SC)<br />
or response complete (RC) status. A remedial process<br />
optimization program was initiated for all treatment systems.<br />
The Site 13 landfill cover was completed. The RAB met<br />
quarterly, took site tours, and participated in a three-day<br />
training session.<br />
In FY03, the Air Force installed the Site 58 pilot-scale dual<br />
extraction system and began operation. Through a partnership<br />
with the Desert Research Institute, the installation completed<br />
soil testing and initiated moisture infiltration modeling to design<br />
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a new generic landfill cover for arid environments. Ecological<br />
and human health risk assessments were completed for three<br />
OUs. The installation's first proposed plan (PP) and ROD for<br />
OU 3 were completed. Nine sites and AOCs achieved SC or<br />
RC status, respectively.<br />
In FY04, pilot tests and TSs at Site 285 and various OU 4 sites<br />
continued. The installation initiated a pilot test to treat<br />
perchlorate effluent discharge in OU 4. The natural resource<br />
injury assessment process resumed. Well installation for the<br />
nano-scale zero-valent iron study at OU 5 was completed. At<br />
Site 325, several wells were installed, and microcosm studies<br />
began to determine the best method of in situ biological<br />
contaminant degradation. The RAB met four times, provided<br />
advice on perchlorate and technical impracticability (TI) issues,<br />
reviewed remediation methods proposed for TSs, and received<br />
training.<br />
In FY05, Edwards AFB began a PHOSter system TS of the<br />
Sites 5/14 groundwater contaminant plume. An in situ<br />
bioremediation TS utilizing whey powder injection was initiated<br />
at the Site 19 trichloroethene (TCE) plume in OU 1. The Air<br />
Force continued to operate the ion exchange (IX) system at<br />
Site 285 in OU 5. The installation initiated in situ biological and<br />
chemical treatment TSs at two locations at Site 282 in OU 5.<br />
Edwards AFB began in situ bioremediation TSs at Sites 162<br />
and 177 in OU 4 and Site 325 in OU 9. The Air Force finalized<br />
the PP for the TI waiver/containment zone designation strategy<br />
for groundwater plumes in OU 4. In addition, the installation<br />
tested the enhancement of hydraulic conductivity and fracture<br />
connectivity in bedrock aquifers by blast fracturing at Site 37 in<br />
OU 4. The installation completed removal actions at Sites 275<br />
and 278 in OU 10. Site 276 was removed from the CERCLA<br />
process because no contamination was found. The Air Force<br />
began the preliminary assessments (PAs) for all identified<br />
Military Munitions Response Program (MMRP) sites. The RAB<br />
met quarterly.<br />
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Edwards AFB continued the IX ex situ TS of perchlorate in<br />
groundwater at Site 285 and continued in situ biological or<br />
chemical treatment TSs at OUs 1, 2, 4, 5, and 9. The<br />
installation performed a bioaugmentation TS of the Site 86<br />
groundwater chlorinated solvent plume and a TS for in situ<br />
chemical oxidation at Site 14. The Air Force performed<br />
enhanced in situ bioremediation and bioaugmentation for<br />
treatment of the groundwater chlorinated solvent plume at Site<br />
3 in OU 7. The installation finalized the OU 2 South Base PP<br />
and submitted the draft OU 7 chemical warfare material (CWM)<br />
feasibility study (FS) report for agency review. The Air Force<br />
and EPA completed and signed the OU 6 ROD. The cost of<br />
completing environmental restoration has changed significantly<br />
due to changes in estimating criteria.<br />
The public reviewed a PP for four of the OU 4 sites and nine<br />
additional sites which included a management plan, land use<br />
controls, monitoring, and the shutdown of the Site 37 and Site<br />
133 groundwater extraction treatment system.<br />
The RAB met quarterly.<br />
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The Air Force continued the PAs at all identified sites. Cost<br />
estimates were updated and the initial Munitions Response Site<br />
Prioritization Protocol rating for each MMRP site was<br />
developed. The Air Force also began some site investigations<br />
(SIs) in FY06.<br />
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Plan of action items for Edwards Air Force Base are grouped<br />
below according to program category.<br />
22222s‚€<br />
0 Complete Site 5/14 in situ chemical oxidation<br />
TS work plan and install the system in FY07.<br />
0 Complete ROD for OU 2 in FY07.<br />
0 Initiate shut down of several ongoing<br />
treatment systems at OUs 2 and 4 in FY07.<br />
0 Complete the OU 1 and OU 7 CWM FS reports in<br />
FY07.<br />
0 Install treatment cells and a six-phase<br />
heating groundwater treatment system at Sites<br />
225 and 298 in FY07.<br />
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0 Complete PAs and SIs for all identified sites<br />
by the end of FY07 and FY10, respectively.<br />
M-55
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