Appendix M: Installation Narrative Summaries - denix

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Air Force Plant No. 44 (AFP 44), located adjacent to Tucson
International Airport, was constructed in 1951 to manufacture
Falcon air-to-air missiles. Over the years, industrial facilities
were constructed to support several other missile systems. EPA
placed the entire Tucson International Airport Area, including
AFP 44, on the NPL in 1983. Contaminants identified at the
installation include solvents, machine coolants and lubricants,
paint sludges and thinners, and heavy metals. The installation
formed a Restoration Advisory Board, which was later
converted to a Unified Community Advisory Board (UCAB). The
installation conducted a 5-year review for six soil sites in FY04.
AFP 44 occupies approximately 27.5 acres of the Tucson
International Airport, which totals 1,374 acres. To date, Records
of Decision (RODs) have been signed for three soil vapor
extraction (SVE) sites, three soil excavation sites, and one
groundwater remediation site. A no further action ROD was
signed for four sites. The cleanup progress at AFP 44 for FY02
through FY05 is detailed below.
In FY02, the installation completed the closeout of the Site 2
system and determined that the remaining trace concentrations
of trichloroethylene (TCE) would not adversely affect
groundwater quality. Operation and maintenance (O&M) of the
groundwater reclamation system, SVE systems, and
dual-phase extraction (DPE) systems continued. The
installation analyzed groundwater samples for the presence of
1,4-dioxane. A draft of the 5-year review was completed and
the installation awaited stakeholder comments on the document
before finalizing it. Several actions of the remedial process
optimization Phase III were implemented. The installation
maintained an active role in the joint UCAB that represents
parties responsible for the Tucson International Airport Area
Superfund Site (TIAASS). The Air Force issued an updated
draft community relations plan (CRP), and updated a workshop
and notebook that summarizes information about TIAASS.
In FY03, the installation conducted an expanded in situ pilot
project at Site 2 using potassium permanganate. EPA Region 9
submitted a limited draft risk assessment for 1,4-dioxane. O&M
of the groundwater reclamation system, SVE systems, and
DPE systems continued. The installation submitted the draft
final Site 2 closure report to regulators for review and
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concurrence. Comments were received from the regulators on
the draft final 5-year review, which was under revision.
In FY04, AFP 44 conducted an expanded in situ pilot project at
Site 3 and submitted a work plan. The installation also
completed the SVE at Sites 3 and 5 and monitored soil gas for
1 year. In addition, the installation completed the 1,4-dioxane
risk assessment and determined the necessary future actions.
The Air Force submitted the findings to regulators and is
awaiting comments. AFP 44 continued O&M of the groundwater
reclamation system, SVE systems, and DPE systems. The
installation continued the Site 2 in situ pilot, resulting in most of
the Site 2 wells being below drinking water standards.
Regulators approved the Site 2 closure report. Sites 3 and 5
were shut off and soil gas will be monitored to verify that the act
of removing contamination in the vadose posed no threat to the
groundwater. AFP 44 completed the 5-year review for six soil
sites. The installation updated and finalized the AFP 44 CRP.
In FY05, AFP 44 completed the Site 3 permanganate injection
and future monitoring results will determine the effectiveness of
the permanganate injections. The installation conducted soil
gas monitoring for Sites 3 and 5. The results indicate most of
the wells are non-detect. AFP 44 continued O&M of
groundwater reclamation system and the DPE was eliminated
because the source areas have been addressed. The Air Force
updated its Military Munitions Response Program (MMRP)
inventory. No MMRP sites were identified at this installation
during the inventory development.
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AFP 44 submitted the closure documents for Sites 3 and 5.
The Air Force is updating the documents based on comments
from EPA Region 9 and the Arizona Department of
Environmental Quality. Additionallly, the Air Force reinjected
more permanganate at Sites 2 and 3 because of the rebound of
TCE concentrations in the monitoring wells. The Air Force is
using soybean and lactic acid to clean up the chromium and
TCE source areas that migrated from Solid Waste Management
Unit D (SWMU D), the former chromium plating area in Building
801. The installation continued O&M of the groundwater
reclamation system. The cost of completing environmental
restoration has changed significantly due to technical issues.
Regulatory issues delayed completion of the closure reports for
Sites 3 and 5.
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The Air Force has identified no MMRP sites at this installation.
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Plan of action items for Air Force Plant No. 44 are grouped
below according to program category.
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0 Complete the closure reports for Sites 3 and
5 in FY07.
0 Reduce the mass of source areas for Sites 2
and 3 by permanganate injection in FY07.
0 Continue cleanup of the chromium and TCE
plume underneath Building 801 which is
migrating from SWMU D in FY07.
0 Continue O&M of the groundwater reclamation
system in FY07.
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There are no MMRP actions scheduled for FY07 or
FY08.
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