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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-99/506
ROD Date:  09/29/1999
Operable Unit(s):  12
Abstract:  Wright-Patterson Air Force Base (WPAFB) is located in southwestern, Ohio, east of the city of Dayton and adjacent to the city of Fairborn. The Base is approximately 60 miles north of Cincinnati and 50 miles west of Columbus. It lies in Montgomery and Greene counties.

The installation is composed of Wright and Patterson Fields, which are separated by State Route 444. Wright Field comprises Area B, approximately 2,800 acres; and Patterson Field comprises Areas A and C, approximately 5,711 acres. The Base is the Headquarters to the Air Force Material Command and home to organizations such as the Air Force Wright Aeronautical Laboratories, Air Force Institute of Technology and the Aeronautical Systems Center. The Base has a significant proportion of its acreage devoted to logistical support/warehouse land uses, research and development and uses and administrative and classroom space. Airfield functions constitute 24 percent of all on-base land uses. The Base has more than 2,500 acres of undeveloped land, but much of that acreage is restricted from certain types of development by environmental constraints, such as flood plains, steep slopes, Indian burial mounds, and other cultural/natural features. Other constraints, such as a new national park, laser testing facilities, explosive safety zones and clear zones for runaways, also restrict development in certain areas.

There are five known historic sites on the installation. Two Indian mound sites and the Huffman Prairie Flying Field, the location of early Wright Brothers aircraft development, are both listed on the National Register of Historic Places. The Huffman Prairie Flying Field is a National Historic Landmark and is part of the Dayton Aviation Heritage National Historic Park.

Adjacent land uses include agricultural, residential, institutional, commercial, and industrial. Commercial strip development in Fairborn and Riverside are situated across from the installation on State Route 444 and Springfield Pike and adjacent to the Page Manor residential area to the southwest. Adjacent industrial activities are situated to the northeast and northwest. Wright State University is adjacent to the south central portion of the installation. Open space remains primarily along the northern/northwestern boundary (the Huffman Reserve) and to the east. Residential development is established all along the southern/southeastern boundary and occurs sporadically along other perimeter areas.

WPAFB was placed on the U.S. Environmental Protection Agency's (EPA's) National Priorities List in October 1989. Subsequently, in March 1991, WPAFB signed a Federal Facilities Agreement (FFA) with USEPA, Region V. A total of 64 Installation Restoration Program (IRP) sites have been identified. Most of these sites are grouped into 11 Operable Units (OUs) across the Base.
Remedy:  The Air Force, State, and USEPA have selected alternatives A1, B3, and C2 as the remedy for Operable Unit (OU12). The primary aspects of these alternatives are:

A1 - Continue current groundwater extraction, treatment and discharge at the Base property boundary in OU5 and continue long-term monitoring in this area. There is a single existing extraction well that continuously extracts the groundwater. It is then treated by air stripping in aeration tanks to remove volatile organic compounds and is then discharged to the Mad River or the West Twin Lake. Monitoring is also conducted periodically.

B3 - In-situ chemical oxidation in the area near Spill Site 11 and monitoring. The chemical oxidation process involves the injection of a strong oxidizing agent, such as Fenton's Reagent or potassium permanganate, into the subsurface. A pilot study is necessary. After the full-scale treatment, groundwater would be evaluated.

R2 - Long-term monitoring for the remainder of the OU, such as those areas that exceed Maximum Contaminant Levels (MCLs) for organic contaminants of potential concern (COPCs), but do not exceed the target risk ranging 1x10^-4 to 1x10^-6; areas that exceed a cumulative cancer risk of 1x10^-4 or a Hazard Index of 1 for organic COPCs, but do not exceed MCLs; areas exceeding remediation goals for inorganic COPCs; and areas with existing remedies in place (OU1 and OU2).

The selected remedy also includes no action for surface water and sediment. Surface water will continue to be monitored in accordance with the Wright-Patterson Air Force Base's National Pollutant Discharge Elimination System permit.

Estimated Capital Cost: $341,000
Estimated Annual Operations and Maintenance Cost: $728,500
Estimated Present Worth Cost: $14,444,000
Text:  View full-text ROD [ 1020K ]
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