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Record of Decision System (RODS)



City & State:  CHESTERFIELD COUNTY  VA  23237
EPA ID:  VA3971520751
EPA Region:  03
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-92/142
ROD Date:  03/25/1992
Operable Unit(s):  05
Media:  Soil.
Contaminant:  VOCS, Metals
Abstract:  SITE HISTORY/DESCRIPTION The 640-acre U.S. Defense General Supply Center (DGSC) is a military support, service, and storage facility located approximately 11 miles south of the City of Richmond, Virginia. Land use in the area is predominantly light industrial and residential with surrounding woodlands. Although the site lies above a shallow aquifer, most residences in the area are served by a municipal drinking water system. From the 1940's to the 1970's, DGSC provided multiple support functions for the U. S. Armed Forces and several federal civilian agencies. Operation areas consist of indoor and outdoor material storage areas, a motor pool facility, a National Guard training area, a firefighting training area, and two acid neutralization pits. Studies conducted by the Army in 1984 led to initiating site clean-up activities. Results of remedial investigations revealed VOCs, other organics, and metal contamination in soil and ground water samples at sites throughout the facility. As a result, remediationof DGSC has been divided into eight operable units to address site contamination issues. These include an open storage source area, National Guard source area, a fire training source area, Area #50 source area, an acid neutralization pit source area, a firefighting training ground water area, an acid neutralization pit ground water area, and Area #50/open storage area/National Guard ground water area. The acid neutralization pit (ANP) area, located in the northern section of DGSC, was in operation from 1958 to the early 1980's. During the time of operation, caustic and acid wastes were collected from onsite metal-cleaning operations in large outdoor 14,000- and 3,000-gallon capacity concrete-lined basins. Periodically, spent cleaning solutions were discharged to the settling pits where they were neutralized and suspended solids were allowed to settle out. The neutralized wastewater was then discharged offsite in either a sanitary or storm sewer. Sludges were also disposed of off-site in a nearby landfill. In 1985, the pits were closed and remedial actions began. After cleaning the pits and prior to filling them with clean fill, cracks in the sides and bottom of the pits were observed, indicating possible routes of contamination of the surrounding soil and ground water. Ground water monitoring around the ANP revealed ground water contamination in the uppermost aquifer. Another 1992 ROD has addressed the mitigation of the open storage area where institutional controls were applied to reduce exposure to the public. This ROD addresses the interim remediation of contaminated soil surrounding the ANP as OU5. A future ROD will address the remediation of ground water associated with the acid neutralization pits. Other RODs will address remediation activities for the remaining contamination areas at the site. The primary contaminants affecting the soil are VOCs, including benzene and PCE; and arsenic, a metal. PERFORMANCE STANDARDS OR GOALS: Chemical-specific soil action levels are based on health-based criteria and include MCLs established for arsenic 5.7 mg/kg; benzene 0.001mg/kg; PCE 1.5 mg/kg; DCE 0.015 mg/kg; TCE 0.036 mg/kg; toluene 2,400 mg/kg; and xylenes 24,000 mg/kg. Soil action levels will protect ground water at the site from further contamination. INSTITUTIONAL CONTROLS: Not provided.
Remedy:  SELECTED REMEDIAL ACTION: The selected remedial action for this site includes treating contaminated soil onsite using a vacuum extraction system, and controlling air emissions using carbon adsorption; constructing concrete covers over the pits to prevent their further use and infiltration of rainwater; disposing of or recycling the spent carbon offsite at a RCRA facility; and sampling soil at the end of the clean-up period to evaluate the effectiveness of the remedy. The estimated present worth cost for this remedial action is $115,607, which includes an annual O&M cost of $ 16,000 for 4 years.
Text:  View full-text ROD [ 59K ]
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