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Record of Decision System (RODS)



Address:  ST RTE 444 
City & State:  DAYTON  OH  45324
EPA ID:  OH7571724312
EPA Region:  05
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/541/R-97/112
ROD Date:  09/30/1997
Operable Unit(s):  02
Media:  Groundwater,soil.
Contaminant:  Benzene, toluene, ethylbenzene, xylenes, PAHs, beryllium, trichloroethene.
Abstract:  The U.S. Air Force Wright Patterson Air Force Base (WPAFB) site is located in southwestern Ohio adjacent to the city of Fairborn. As of 1990, the city of Fairborn had a population of 31,298; the daily population at WPAFB can exceed 40,000 people. The base is composed of Wright and Patterson Fields, which are separated by State Route 444. Wright Field comprises Area B, approximately 2,800 acres; Patterson Field comprises Areas A and C, approximately 5,711 acres. Operable Unit 2 (OU 2) includes spill sites 2 and 3 within the Petroleum, Oil, and Lubricant (POL) Storage Area and spill site 10 located about 600 ft. southwest of the POL Storage Area. Military, industrial, commercial, office, residential, educational, agricultural, and recreational land use exists within a 1-mile zone of OU 2.WPAFB is the Headquarters to the Air Force Materiel Command and home to organizations such as the Air Force Wright Aeronautical Laboratories, Air Force Institute of Technology, and the Aeronautical Systems Center. A large portion of the Base is devoted to logistical support/warehouse land uses, research and development, and administrative and classroom space. Airfield functions constitute 24% of the on-Base land uses. WPAFB is not scheduled for closure under the Base Realignment and Closure Program.Historically, the OU 2 POL Storage Area was used to store heating, automotive, and jet fuel products. The petroleum products were transferred to fueling stations or other areas of the Base through a network of underground pipes and valves. The underground piping was abandoned in place and replaced with aboveground piping in 1996.Spill Site 2 is associated with the release of approximately 8,300 gallons of jet fuel in 1976; the spill occurred within a diked area surrounding the tank. Spill Site 3 involved the release of 1,200 to 2,500 gallons of fuel oil in 1981; the spill occurred between Tank 272 and the fueling station. The spill at Site 10 occurred in 1989 when a flange gasket ruptured on a fuel hydrant and released an estimated 150 gallons of fuel. In addition to these spills the underground piping system may have had other leaks that contributed to the contamination of the soil and groundwater in the area.From 1991 until 1995, several cleanup actions took place. Two recovery systems were installed to collect any contaminants from a monitoring well in the POL Storage Area. When the second recovery system was destroyed in a fire, it was not rebuilt, because only minimal product was being collected. A passive recovery system was installed in a different well in the area and a bioventing system was added to demonstrate the viability of soil bioventing. Lastly, upgrades to the POL facility were made including installing fixed roofs and new valves on the tanks and installing an oil/water separator. Additional improvements were made to the facility in 1996.
Remedy:  The major components of the selected remedy include in-situ biodegradation of contaminants in subsurface soil; natural attenuation of contaminants in groundwater; operation and maintenance of existing recovery systems; institutional controls; and subsurface soil and groundwater monitoring.
Text:  View full-text ROD [ 527K ]
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