Wright-Patterson Air Force Base
Wright-Patterson Air Force Base (WPAFB) is located in southwestern Ohio near Dayton. It is divided into two main parts: Wright Field (also called Area B) to the south, and Patterson Field (also called Areas A & C) to the north. Wright Field consists of 2,300 acres and three old runways. It houses various Air Force laboratories and the Air Force Museum. Patterson Field is 4,900 a cres in size and contains the active runway complex. Other activities there include warehouses, offices, industrial facilities and flight line support. WPAFB is headquarters for the Air Force Materiel Command and employs approximately 30,000 persons, both military and civilian. WPAFB overlies the Mad River Buried Valley Aquifer, which is a sole-source aquifer providing drinking water for over 500,000 people.
The Air Force's Installation Restoration Program (IRP) at WPAFB began in 1981. Initially, 39 distinct sites on the Base were investigated, with other sites added later. In 1989, WPAFB was listed on the NPL, and a Federal Facilities Agreement with EPA was signed in 1991. The IRP currently consists of 65 sites (including 13 landfills, 12 earthfill disposal zones, 11 fuel spill sites, 5 fire-training areas, 4 burial sites, and various others). The individual sites have been ranked from high to low risk using DoD's relative risk ranking system. There have been a number of past removal actions including drum and tank removals, free product recovery systems, and groundwater pump-and-treat systems. The sites have been grouped into 11 source control operable units and 1 basewide groundwater operable unit called the Basewide Monitoring Program.
There have been extensive efforts at WPAFB by EPA, Ohio EPA, and the Air Force to streamlining the clean up process. The Consensus Statement for Streamlining the RI/FS Process at WPAFBwas signed in October, 1995, but implementation began as early as 1994. Under this process, sites are referred to removal actions, no action, or the full RI/FS process based on an early semi-quantitative risk assessment (if risk > 1e-4, then a removal action is begun; if risk between 1e-4 and 1e-6, then the full RI/FS process is used; if risk < 1e-6, then a no action ROD is prepared). Key aspects of this process: no action sites will be separated out early where possible; removal actions will be non-time critical removals with the Air Force as the lead agency; landfills will be addressed using the presumptive remedy of landfill capping; EE/CAs will be prepared where there is no presumptive remedy. There will be a final ROD for the entire Base after all OUs have been addressed, which will tie everything together.
Operable Unit 1: Two interim Records of Decision (RODs) have been signed for OU 1 (Landfills 8 and 10). The first ROD was for a source control OU (May, 1993) and included landfill capping, leachate collection and treatment, gas collection and treatment, public water supply, and institutional controls. The landfill cap was completed in the summer of 1996 and construction of the leachate treatment system is due to be completed in the summer of 1997. The second ROD was a no action ROD for an off-source OU (June, 1994).
Operable Unit 2: Several sites from OU 2 were separated out for a no action ROD signed in September of 1996. Two free product recovery systems are in place and three fuel spill sites are currently being evaluated for remedial action.
Operable Unit 3: Several sites from OU 3 were separated out for a no action ROD signed in September of 1996. A removal action to cap landfill 11 was completed in the summer of 1997. A removal action to excavate and dispose of material from landfill 12 is scheduled to begin in the Autumn of 1997.
Operable Unit 4: A removal action to cap two landfills (6 and 7) from OU 4 is scheduled to begin in the Autumn of 1997.
Operable Unit 5: A removal action (pumping and air stripping) to address groundwater contaminated by chlorinated volatile organic compounds began in 1992 and is continuing. A removal action to cap landfill 5 was completed in 1996. The remaining sites from OU 5 were separated out for a no action ROD signed in September of 1996.
Operable Unit 6: A removal action to cap landfills 1 and 2 is scheduled to begin in the Autumn of 1997. The remaining site from OU 6 was separated out for a no action ROD signed in September of 1996.
Operable Unit 7: A removal action to cap landfill 9 is scheduled to begin in the Autumn of 1997.
Operable Unit 8: A removal action to treat groundwater contaminated by fuel began in the Spring of 1997. A removal action to install a french drain to address fuel spills at spill site 11 is currently in design.
Operable Unit 9: The remedial investigation for OU 9 sites is currently being finalized.
Operable Unit 10: All sites from OU 10 were separated out for a no action ROD signed in September in 1996.
Operable Unit 11: The remedial investigation for OU 11 sites is currently being finalized.
Operable Unit 12 (Basewide Monitoring Program): Investigation and delineation of remedial alternatives for OU 12 are currently being evaluated for the basewide groundwater.