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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/541/R-99/052
ROD Date:  08/31/1999
Operable Unit(s):  04
Media:  Soil, Surface Water
Contaminant:  Base Neutral Acids, Dioxins/Dibenzofurans, Inorganics, Metals, PAH, PCBs, Pesticides, Petroleum Hydrocarbon, VOC
Abstract:  Past industrial operations at the Defense General Supply Center (DGSC) have included parachute manufacture and repair, mess kit and canteen repair, refrigerator repair, material handling, equipment overhaul, and engine rebuilding. Current industrial operations include the refurbishing of steel combat helmets and compressed gas cylinders using both wet (acid and caustic) and dry (ball blasting) processes and tent and fabric repair. The site is also used to perform minor vehicle repairs, fluid changes, and vehicle lubrication. There are several underground gasoline and fuel storage tanks located throughout the installation.

Chemical operations at the site have included storing and shipping flammable, toxic, corrosive and oxidizer chemicals for the Defense Logistics Agency (DLA). The majority of the chemicals are stored in warehouses at the site. Stored chemicals included pesticides and herbicides for use at the site and as part of the chemical stock mission of the DGSC. The National Guard Area (NGA) is one area of the DGSC. The Virginia Army National Guard has leased this property from DGSC since the 1950's. It is currently used for vehicle maintenance operations, which includes the use of both chlorinated and nonchlorinated solvents for the degreasing process.

Operable Unit 3 consists of soils in the NGA. Soils of this site are mostly covered by concrete, asphalt, and gravel. Previous activities that have occurred in this area include the use of under and above ground storage tanks for the storage of fuels, oils, and solvents. Some waste solvents were reportedly disposed of in the site's storm sewer, or on an unpaved area on the site. Waste liquids from the NGA have also been used for dust suppression on local roads. A former portable sandblasting operation in the vicinity of the alleged sludge disposal area has also been reported. Eight underground storage tanks sites exist at the NGA. Seven have been brought into conformance with Commonwealth of Virginia regulations by either testing, removal, or replacement.

The number 7 tank probably does not exist. There are plans to investigate this particular matter within the next year.

The primary activities that occur at the NGA are vehicle maintenance operations, using both chlorinated and nonchlorinated solvents for degreasing purposes. All currently generated waste oils and solvents are disposed of through a private contract. Effluents from the vehicle washracks at this site, which are equipped with grit traps and oil/water separators, are discharged to the sanitary sewer system.

Sampling conducted at the site during the Remedial Investigation (RI) activities revealed the presence of certain metals, various polynuclear aromatic hydrocarbons (PAHs), and some volatile organic compounds (VOCs). The upper aquifer is primarily contaminated with volatile and semi-volatile organics. Volatile and semi-volatile organics were also detected in the lower aquifer. Aquifer contamination at NGA is addressed by this document only to the extent that it is impacted by soil contamination.

Ground water contamination at this site is a component of Operable Units 6 and 9 and is addressed by separate RODs and proposed plans.

The DGSC has implemented a Spill Prevention Control and Countermeasure Plan (SPCC) and an Installation Spill Contingency Plan (ISCP) to aid in the prevention, control, and remediation of spills at the DGSC. The SPCC plan identifies procedures and actions that are to be followed to prevent spills and/or control spills once they occur. The ISCP presents guidelines for spill response, including cleanup and disposal of chemicals and contaminated risks.

In 1984, the DGSC was recommended for placement of the National Priorities List (NPL).

In August 1986, the EPA issued a Corrective Action Permit to DGSC pursuant to the Resource Conservation and Recovery Act (RCRA), 42 U.S.C. 6901, et seq.

In 1987, the DGSC was placed on the NPL as a result of Hazard Ranking System scoring performed for the DGSC that was based on the conclusions of previous studies.
Remedy:  The selected remedy for OU 4 is No Further Action. The selected remedy is based on the results of the revised risk assessment. Based on the concentrations of analyses detected in the soil samples collected from the FTA and the risk posed to current and future on-site workers, future construction workers, and future residents, no further action is deemed necessary. It is important to note that this action is based on exposure scenarios considering direct contact with the soil. The FTA soil may require action under OU 7 to address the potential for migration of contaminants to groundwater.

No significant changes in site conditions have occurred since the issuance of the Final Remedial Investigation Report. The selected remedy will consist of leaving the site intact. No additional sampling or monitoring will be necessary because no future potential threats to human health or the environment exist based on the current low levels of residual contamination, and the acceptable levels of risk to both human health and the environment. The selected remedy will have no associated cost.

Estimated Capital Cost: not provided
Estimated Annual O&M Cost: not provided
Estimated Present Worth Costs: not provided

Based on an extensive Remedial Investigation and Feasibility Study, it has been determined that the No Action Alternative is the most appropriate remedial decision for the Former Fire Training Area.
Text:  View full-text ROD [ 567K ]
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