Record of Decision System (RODS)
DOVER AIR FORCE BASE
|Site Name:||DOVER AIR FORCE BASE|
|City & State:||DOVER DE 19901|
|NPL Status:||Currently on the Final NPL|
|ROD Type:||Record of Decision|
|Contaminant:||1,1-dichloroethane, 1,2-dichloroethene, perchloroethene, 1,1,1-tric|
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.
Dover Air Force Base (DAFB)is located in Kent County, Delaware, 3.5 miles southeast of the city of Dover and is bounded to the southwest by the St. Jones River. DAFB comprises approximately 4,000 acres of land. The surrounding area is primarily cropland and wetlands.
DAFB began operation in December 1941. The present mission of DAFB is to provide global airlift capability, including transport of cargo, troops, equipment, and relief supplies.
The portion of DAFB addressed in this ROD is located within Area 6 of the West Management Unit. The West Management Unit is one of four Management Units into which the base has been divided. Area 6 is the largest of five associated areas identified in the West Management Unit.
DAFB is relatively flat, with elevations ranging from approximately 10 to 30 feet above mean sea level (MSL). The ground surface is covered almost entirely by buildings, concrete, and asphalt. Surface water runoff throughout the industrialized portion of Area 6 is controlled by an extensive storm drainaige system. The storm drains direct most runoff to either Pipe Elm Branch or the golf course tributary to the St. Jones River.
Four regions were identified in Area 6 where shallow groundwater contained combined concentrations of the chlorinated solvents trichloroethene, perchloroethene, and 1,2-dichloroethene. These regions were inferred to be in the vicinity of the source areas for remediation termed Target Areas. A soil gas survey was conducted in the vicinity of Building 719 to better define the vadose zone source of chlorinated solvent contamination. Several chlorinated solvent constituents were detected in soil gas samples.
|Remedy:||The selected interim remedy consists of in situ bioremediation of groundwater and soil utilizing co-metabolic bioventing and intrinsic bioremediation. Co-metabolic bioventing and intinsic bioremediation are two of the bioremediation technologies being applied to the Target Areas to promote the development of alternate and innovative treatment technologies as encouraged under CERCLA.|
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