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Record of Decision System (RODS)

WRIGHT-PATTERSON AIR FORCE BASE

Abstract

Site Name:  WRIGHT-PATTERSON AIR FORCE BASE
Address:  ST RTE 444 
City & State:  DAYTON  OH  45324
County:  GREENE, MONTGOMERY
 
EPA ID:  OH7571724312
EPA Region:  05
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R05-94/262
ROD Date:  06/30/1994
Operable Unit(s):  01
 
Media:  groundwater, leachate
 
Contaminant:  Vinyl chloride, 1,2-dichloroethane, barium, arsenic, benzene
 
Abstract:  Please note that the text in this document summarizes the Record of Decision for the purposes of facilitating searching and retrieving key text on the ROD. It is not the officially approved abstract drafted by the EPA Regional offices. Once EPA Headquarters receives the official abstract, this text will be replaced.

Wright-Patterson Air Force Base is located in southwestern Ohio, east of the City of Dayton and adjacent to Fairborn. The base is approximately 60 miles north of Cincinnati and approximately 50 miles west of Columbus.

The installation is composed of Wright and Patterson Fields, which are separated by State Route 444. Landfills 8 & 10 are located in the northeast corner of Area B. Landfills 8 & 10 are separated by roughly 1,000 feet. An unnamed tributary to Hebbie Creek flows through the valley between the landfills. Currently, the entire area encompassing Landfills 8 & 10 is fenced and posted as "Off Limits."

The area surrounding the site includes on-base military housing known as the Woodland Hills housing subdivision and off-base private homes on National and Zink Roads and Kauffman Avenue. These off-base homes are serviced by private drinking water wells. The Woodland Hills military housing units are serviced by private drinking water wells. The Woodland Hills military housing units are serviced by the base water supply which draws its water from another area of the base.

The Woodland Hills military housing subdivision, consisting of 368 dwelling units, occupies the area generally north of Landfill 8 and the areas generally west, east, and south of Landfill 10. Seven private homes are located along National Road just west and within 300 feet of Landfill 8. Five private homes are located east and within about 1000 feet of Landfill 10, with one on Kauffman Avenue and four on Zink Road. A new subdivision is currently under construction in the area immediately south of Landfills 8 & 10.

Both landfills support several small stands of cattails that have developed in saturated depressions on the landfill caps. The depressions are the result of compaction and settling of the previous soil covering.

Landfills 8 & 10 and surrounding base property have been used for both operational and recreational purposes. Initially used for military training, the area was then converted to fill areas for refuse disposal. Landfill 8, the older of the two, began operation about 1947 and encompasses approximately 11 acres. Landfill 10 was opened in 1965 and covers eight acres. Following closure in the early 1970s, the landfills and surrounding area were then used for recreation until April 1985. At that time the area was declared off limits and restricted access to both landfills and the intervening valley with a security fence in response to concerns expressed by the Ohio Environmental Protection Agency (OEPA) and the United States Environmental Protection Agency (EPA) over potential exposure of local residents to hazardous waste.

Refuse was deposited in both landfills in a trench-and-cover operation. General refuse containing unknown quantities of oily wastes, organic and inorganic chemicals, and hospital wastes was reportedly deposited in the landfills. Trenches east of Landfill 10 were reportedly used for disposal of hazardous chemicals.

Military housing units north of Landfill 8 and east of Landfill 10 that are adjacent to the landfills were vacated in 1990, partially in response to a health consultation issued by the Agency for Toxic Substances and Disease Registry (ATSDR). Several factors contributed to the decision to vacate homes, including temporary, periodic displacement of residents during the environmental investigation fieldwork. These include detection of subsurface migration of methane gas towards the housing units; and long-term planning considerations related to eventual installation of a multi-layer cap on both landfills. Based upon the absence of significant concentrations of methane or other gases detected during indoor air monitoring and upon consultation with ATSDR, EPA, and OEPA, the Air Force reoccupied selected homes in 1992. All vacated homes north of Landfill 8 were reoccupied. Reoccupied homes were equipped with continuous methane monitors as a precaution. Because of the eventual installation of a multi-layer cap, 14 structures east of Landfill 10 remain vacant.

Elevated concentrations of vinyl chloride, 1,2-dichloroethane, barium, and arsenic were detected in off-source monitoring wells on the east and north side of Landfill 8. Benzene and barium were detected in off-source wells on the west, south, and east sides of Landfill 10.

Ambient (breathing) air and private water sources in the vicinity of Landfill 8 and 10 have not shown significant chemical contamination attributable to the landfills, however, the potential exists for these media to become contaminated in the future.
 
Remedy:  The selected remedial action contains the following components: covering both landfills with clay caps to reduce rainwater passing through the landfills and hazards from dust, and to minimize landfill gas emissions; collecting and treating the leachate from the landfills to prevent contaminants from migrating to surface water and groundwater; collecting and treating contaminated groundwater downgradient of the site to eliminate any potential hazards from exposure to groundwater; connecting the residents of National and Zink Roads and Kauffman Avenue to the City of Fairborn public water supply to eliminate any potential hazards from exposure to groundwater; removal of asphalt slabs in the unnamed tributary to Hebbie Creek to eliminate a potential source of contaminants; long-term monitoring of soil gas, groundwater, and air to ensure the effectiveness of remedial actions; deed restrictions designed to legally prohibit construction, mining, drilling, and installation of wells on the property at and surrounding the site to prevent future exposure to contaminated groundwater and site contaminants; and continue to restrict site access with a combination of fencing, warning signs, and security patrols to help prevent direct contact with site contaminants.
 
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