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Record of Decision System (RODS)

DOVER AIR FORCE BASE

Abstract

Site Name:  DOVER AIR FORCE BASE
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/541/R-97/177
ROD Date:  09/30/1997
Operable Unit(s):  09
 
Media:  Groundwater
 
Contaminant:  1,2-DCE, benzene, ethylbenzene, vinyl chloride, 2-methylnaphthalene, bis(2-ethylhexyl)phthalate, dieldrin, endosulfan II, endosulfan sulfate, endrin aldehyde, endrin ketone, arsenic, cobalt, manganese, magnesium.
 
Abstract:  Dover Air Force Base (DAFB) is located in Kent County, Delaware, 3 1/2 miles southeast of the City of Dover. DAFB comprises approximately 4,000 acres of land, including annexes, easements, and leased property. The surrounding area is primarily cropland and wetlands. The portion of DAFB addressed in this document is called FT03.DAFB began operation in late 1941. Since then, various military services have operated out of DAFB. The current host organization is the 436th Airlift Wing. Its mission is to provide global airlift capability, including transport of cargo, troops, equipment, and relief supplies. DAFB is the east coast home terminal for the C-5 Galaxy aircraft. The base also serves as the joint services port mortuary, designed to accept casualties in the event of war. The C-5 Galaxy, a cargo transport plane, is the largest aircraft in the Air Force, and DAFB is one of the few military bases at which hangars and runways are designed to accommodate these planes.FT03 is 2 to 3 acres in size and is located in the northeast portion of DAFB. This site is the most recent location of fire training exercises at DAFB and was used between 1970 and 1989. Waste oils and non-specification fuels were ignited twice weekly for fire training activities. The controlled burn was contained within an area constructed of a 12-inch soil and gravel berm.Investigations were conducted at the site from the mid-1980s until 1990. A removal of contaminated soil was conducted in 1992, and installation of a clay cap and soil cover over the newer fire training area (FTA) was completed. Another investigation was conducted from early 1993 until 1994 that focused on the older FTA and groundwater. Soil borings and monitoring wells have been installed as a result of this investigation.
 
Remedy:  The selected remedy for the site consists of in situ remediation of groundwater using natural attenuation, institutional controls consisting of continuation of the restrictions on using on-base groundwater from the Columbia Aquifer, and groundwater monitoring.
 
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