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Record of Decision System (RODS)



Address:  RTE 113 
City & State:  DOVER  DE  19901
County:  KENT
EPA ID:  DE8570024010
EPA Region:  03
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-93/163
ROD Date:  11/04/1992
Operable Unit(s):  02
Media:  GW
Contaminant:  Organics
Abstract:  The 9-acre Dover Air Force Base site is part of the 4,000-acre Dover Air Force Base (DAFB) located in Kent County, Delaware. Land use in the area is predominantly residential, commercial, industrial, and agricultural. The site is bounded by the Jones Street River on the southwest and Little Creek to the northeast. The site overlies two aquifers, the Cheswold and Piney Point aquifers, which provide 80% of the municipal and industrial water supply, but are not currently affected by the site. The site contains two landfills, known as the WP14 (D-4) landfill and the LF18 (D-10) landfill, respectively. The WP14 (D-4) site is used for training and camping. The LF18 (D-10) site is a former landfill, which underlies six acres of the U.S. Air Force Base's golf range, and was used during the 1950s for disposal of Base refuse, spent chemicals, and industrial shop waste. Over the past fifty years, DAFB managed and disposed of hazardous wastes onsite in several ways, including landfilling, storage tanks, wastewater lagoons, and using oil and water separators. From 1941 through 1963, these landfills and/or pits were used to dispose of oils, paints, fuels, solvents, as well as wastewater from the onsite industrial shops. These wastes were discharged into a storm drainage ditch and, ultimately, into surface water. During the 1950s and 1960s, the WP14 (D-4) site was used to dispose of waste solvents, hydraulic fluids, and other containerized or free liquids in an unlined trench that was later filled in and reseeded. Floating waste has been reported at two areas of DAFB, and oily releases are known to have occurred from these two onsite landfills. Dark brown oil also has been observed in the monitoring wells at the site. Both of these areas were investigated as part of the Air Force Installation Restoration Program (IRP) although no previous or remedial actions have been conducted at either site. This ROD addresses the floating wastes at both the WP14 (D-4) and LF18 (D10) sites, and provides an interim remedy, as OU2. A future ROD will address remediation of contaminated soil and ground water. The primary contaminants of concern affecting the ground water are organics, specifically oils. SELECTED REMEDIAL ACTION: The selected remedial action for this site includes trenching to collect floating waste; pumping and/or bailing floating wastes from the monitoring wells; storing the hazardous wastes onsite at either Building 1306, a hazardous waste storage area, or in drums at specific sites; testing the waste prior to either RCRA disposal or recycling offsite; disposing of all ground water from the treatment process to a septic system, drainage ditch, or infiltration trench; considering other methods to collect the waste; and developing a monitoring program. The estimated present worth cost for this remedial action ranges from $140,000 to $150,000. PERFORMANCE STANDARDS OR GOALS: This action will reduce the spread of the plume of floating waste and recover the waste, as practicable. No chemical-specific goals were provided for this interim remedy. INSTITUTIONAL CONTROLS: Not provided.
Remedy:  The selected interim remedy for these Sites addresses the long term, principal threat, continued ground water degradation, present at the WP 14 (D-4) and LF 18 (D-10) Sites.

The principal components of the selected remedy are as follows:
. The installation of a pumping unit or bailing of an existing on-site well to recover and control the migration of floating waste under each Site;
. The completion of additional monitoring and/or extraction wells as needed to effectively withdraw the floating waste and to ensure protectiveness of human health and the environment and to control the migration of groundwater, respectively; and
. The treatment or disposal of the recovered floating waste and entrained ground water.
Text:  View full-text ROD [ 57K ]
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