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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/R03-95/210
ROD Date:  09/26/1995
Operable Unit(s):  04
Media:  Groundwater, soil
Contaminant:  Lindane
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 the lindane source area, which is one of the source areas evaluated in the Focused Feasibility Study (FFS). The lindane 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 (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 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. The Area 6 RI identified a lindane groundwater plume that emanates from the Paint Washout Area. Lindane is a nonvolatile pesticide compound. The lindane source is believed to reside in the subsurface soils of the open storage yard in the Paint Washout Area. Lindane concentrations in shallow groundwater are approximately three orders of magnitude higher in this well than in the nearest upgradient shallow well.
Remedy:  The selected interim remedy consists of excavation and removal of the lindane-contaminated soil source with offsite incineration treatment. The soil source of lindane will be further delineated during the Remedial Design. The lindane-contaminated soil will be handled as a U129 listed hazardous waste as defined under the Delaware Regulations Governing Hazardous Waste.
Text:  View full-text ROD [ 26K ]
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