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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/R03-95/208
ROD Date:  09/26/1995
Operable Unit(s):  10
Media:  groundwater
Contaminant:  Trichloroethene, perchloroethene, 1,2-dichloroethene
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.

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.

This ROD addresses Target Area 2, which is one of the chlorinated solvent source areas evaluated in the Focused Feasibility Study (FFS). The chlorinated solvent source area 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. 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 drainage system. The storm drains direct most runoff to either Pipe Elm Branch or the golf course tributary to the St. Jones River.

Area 6 is defined by the association of chlorinated solvents in groundwater forming a plume in the Columbia Aquifer. Several separate potential sources were identified in the Area 6 RI that may have contributed to the chlorinated solvent contamination. Several separate potential sources were identified in Area 6 which may have contributed to the chlorinated solvent contamination. These potential sources include some twelve IRP (The U.S. Air Force Installation Restoration Program) sites within the Area 6 groundwater flow regime. Additionally, various shops and hangars where solvents are used may also be sources. The shop activities where solvent use is common include painting or paint stripping, aircraft and vehicle maintenance, and plating or welding.

The Area 6 RI identified four regions where shallow groundwater contained combined concentrations of the chlorinated solvents trichloroethene, perchloroethene, and 1,2-dichloroethene in excess of acceptable standards. The groundwater data suggested that primary source areas reside in the vicinity of various reference points. Area 2 is defined as the Civil Engineering Shops Area, one of the primary suspected source areas with significantly impacted portions of the shallow and deep groundwater plumes surrounding it.
Remedy:  The selected interim remedy consists of in situ bioremediation of groundwater utilizing accelerated anaerobic biodegradation. Accelerated anaerobic biodegradation is one of the bioremediation technologies being applied to the Target Areas to promote the development of alternate and innovative treatment technologies as encouraged under CERCLA.
Text:  View full-text ROD [ 42K ]
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