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Record of Decision System (RODS)

CHEM-SOLV, INC.

Abstract

Site Name:  CHEM-SOLV, INC.
Address:  176A N DUPONT HIGHWAY 
City & State:  DOVER  DE  199014264
County:  KENT
 
EPA ID:  DED980714141
EPA Region:  03
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-92/146
ROD Date:  03/31/1992
Operable Unit(s):  01
 
Media:  GROUNDWATER
 
Contaminant:  VOCS, METALS
 
Abstract:  SITE HISTORY/DESCRIPTION: The Chem-Solv site, located in Cheswold, Kent County, Delaware, occupies approximately one-third of a 1.5-acre property and consists of a one-story concrete building, a distillation process building, and a concrete pad used for drum storage. Surrounding land use is mixed agricultural, residential, and commercial strip development. In the vicinity of the site, the Columbia Formation functions as a thin water-table aquifer and is a potential source of drinking water in the area. From 1981 to 1984, Chem-Solv, Inc., used the facility to purify spent industrial solvents and store the distillation residues, known as "still bottoms," for offsite disposal as hazardous waste. After an explosion and fire at the facility in 1984, during which stored solvents ran off the concrete pad, a state investigation concluded that this incident and prior hazardous waste handling violations had resulted in soil and possible ground water contamination of the site with VOCs. AfterChem-Solv failed to comply with a state order, the state removed 1,300 cubic yards of contaminated soil and a portion of the storage pad and implemented a ground water treatment system that operated from 1985 until 1988. This ROD addresses the ground water contamination in the Columbia aquifer. The primary contaminants of concern affecting the ground water are VOCs, including benzene and TCE; and manganese, a metal. PERFORMANCE STANDARDS OR GOALS: Chemical-specific ground water clean-up goals are based on SDWA MCLs or risk-based levels, includingbenzene 5 ug/l (MCL); and TCE 5 ug/l (MCL); manganese 3,000 ug/l (risk- based). INSTITUTIONAL CONTROLS: A ground water restriction zone will be instituted and deed restrictions will be placed on all properties within the restriction zone until ground water cleanup levels are achieved throughout the contaminated area.
 
Remedy:  SELECTED REMEDIAL ACTION: The selected remedial action for this site includes ground water pumping and offsite discharge to a POTW for treatment, or as a contingency if an agreement with the POTW cannot be reached, onsite treatment using filtration, and air stripping with onsite discharge to surface water; conducting ground water monitoring and providing an alternate water supply, including wellhead treatment to affected residences if ground water monitoring detects contamination in existing residential wells; removing existing recovery wells; and implementing institutional controls, including deed and ground water use restrictions. The present worth cost for the selected remedial action ranges from $660,000 to $686,000, which includes an annual O&M cost ranging from $57,000 to $148,000. Present worth costs for the contingency remedy would be $688,000, which include an annual O&M cost ranging from $148,000 to $189,000.
 
Text:  View full-text ROD [ 75K ]
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