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Defense General Supply Center
EPA Region 3 (Mid-Atlantic)
EPA ID# VA3971520751
4th Congressional District
Last Update: January 2015
Current Site Status
The following paragraphs include highlights of the progress made at the Defense Supply Center Richmond (DSCR) over the last fiscal year.
Operable Unit 6 (OU 6)
The Remedial Action Work Plan for OU 6 has been completed. The selected remedy is in-situ bioremediation and will include injection of organic carbon to treat groundwater contamination.
The selected remedy for OU 7 is in-situ bioremediation. Emulsified vegetable oil was injected in 25 wells in OU 7 in June/July 2013. Groundwater monitoring results collected so far indicate the remedy is working as intended. A Remedial Action Completion Report is expected this fiscal year.
The contingency plan for OU 8 was invoked due to continued plume migration and included in situ bioremediation to enhance natural attenuation. Emulsified vegetable oil was injected in 6 wells in OU 8 in June/July 2013. Groundwater monitoring results collected so far indicate the remedy is working as intended in the source area.
Vapor intrusion pathway sampling has been completed for several residences near the OU 8 groundwater plume. With the exception of one anomalous detection preliminary risk analysis indicates no unacceptable risk to residents. The anomalous detection is not believed to be from vapor intrusion and subsequent samples showed no detections.
The remedial action is complete. Approximately 55 cubic yards of soil were excavated from the low-lying wooded area and backfilled with low-permeability clean soils. Additionally, institutional controls, such as land-use and access restrictions, have been implemented at the site.
Defense Supply Center Richmond is a federal facility located in Chesterfield County, Virginia, about eight miles south of the city of Richmond. The site consists of approximately 640 acres that have been used as a Defense Logistics Agency supply center since 1941. Past operations conducted on site include aviation equipment manufacturing and repair, firefighter training, and the use and storage of hazardous materials. Current industrial operations include refurbishing helmets and steel compressed gas cylinders using dry (ball blasting) processes and tent fabrication and repair. Chemical operations at the site have included storing and shipping flammable, toxic, corrosive, and oxidizer chemicals as well as pesticides. In the 1960s and early 1970s, DSCR disposed of some of their waste material in a shallow ravine called the Area 50 Landfill. In the 1980s, groundwater contaminated primarily with volatile organic compounds (VOCs) was detected downgradient of the landfill, and the site was placed on the National Priorities List (NPL) of hazardous waste sites.Off-site residents are primarily served by a Chesterfield County-operated water supply system, although a few private home water supply wells remain in use in the locale.
- Site Responsibility
This site is being addressed through federal actions.
- NPL Listing History
- This site was proposed to the National Priorities List of the most serious uncontrolled or abandoned hazardous waste sites requiring long-term remedial action on October 15, 1984. The site was formally added to the list July 22, 1987.
Threats and ContaminantsGroundwater is contaminated with VOCs and possibly metals from former chemical wastes disposal practices. Sediments are contaminated with pesticides and polycyclic aromatic hydrocarbons (PAHs). The soil contains VOCs and pesticides, and the surface water is contaminated with metals and pesticides. Those who accidentally ingest or come in direct contact with contaminated groundwater, surface water, soil, or sediments may be at risk.
Contaminant descriptions and risk factors are available from the Agency for Toxic Substances and Disease Registry, an arm of the CDC.
There are a total of 13 OUs at DSCR; nine are source (soil) areas, three are groundwater OUs and there is one groundwater interim action OU. RODs have been completed for all OUs. All remedies have been implemented except for OU 6. The following paragraphs provide brief histories of each OU.
The Open Storage Area (OU 1) was historically used for storage and recoupment activities. An interim ROD was signed in 1992; a revised Human Health Baseline Risk Assessment (HHBRA) and Explanation of Significant Differences (ESD) was issued in 2007. The remedy consists of LUCs and annual inspections.
Area 50 Landfill (OU 2) was formerly used to dispose of chemicals and construction debris. The ROD was signed in 2008 and the remedy consisted of a soil cover and LUCs. The Remedial Action Completion Report was finalized in June 2010.
The soil within the National Guard Area (OU 3) was impacted by vehicle maintenance and degreasing activities. The remedy, documented in the 1995 ROD, consisted of an asphalt cover and LUCs.
The soil at OU 4, the Former Fire Training Area, was found to need no further action (NFA) and the ROD was signed in 1999.
The Acid Neutralization Pit area (OU 5) consists of two former concrete settling tanks, used for the neutralization of acidic wastewater from metal cleaning and painting operations. The ROD was signed in 1992 and identified the use of a soil vapor extraction (SVE) system to reduce remaining VOC concentrations to below the soil remediation objective. However, upon further investigation using a pilot study, a full-scale SVE system was decided to be unnecessary and an ESD was signed in 1995. The ESD recommended no further action be required. The pits have been covered with concrete and LUCs are in place to limit future land use.
OU 6 consists of the groundwater contamination plume underneath OUs 1, 2 and 3. Contaminants of Potential Concern (COPCs) primarily include chlorinated VOCs. Bioremediation treatability studies have been performed in four source areas. A ROD was signed for OU 6 in September 2013 and the selected remedy is in situ bio remediation.
OU 7 consists of the groundwater contamination plume beneath OUs 4 and 13. Similar to OU 6, the COPCs include chlorinated VOCs and bioremediation treatability studies have been performed at three source areas. The ROD was signed in 2012 and the selected remedy is in situ bioremediation. Emulsified vegetable oil was injected in summer 2013.
OU 8 is the groundwater beneath OU 5 and contains chlorinated VOCs. The ROD was signed in 2007 and the remedy consists of monitored natural attenuation (MNA), with an in-situ bioremediation contingency. An ESD to document a shift to the contingency remedy was finalized in September 2011. Emulsified vegetable oil was injected in summer 2013.
OU 9 includes the interim remedy for OU 6, which was finalized through an interim action ROD in 1993. The action consisted of a groundwater extraction and air-stripping system to reduce mass and limit further transport of impacted groundwater off-site. A rebound test of the treatment system revealed the operation of the system was not necessary and an amendment to the interim ROD authorizing the decommissioning of the system was signed in 2008. The final remedial action for the OU 9 groundwater plume is being addressed through the action taken at OU 6.
The former Building 68 area (OU 10) was historically used as a pesticide storage building. The remedy documented in the 2007 ROD includes a vegetative cover and LUCs.
The Transitory Shelter 202 area (OU 11) was formerly a storage area. The remedy, as finalized through the 2007 ROD, also consists of a vegetative cover and LUCs.
The former Building 112 area (OU 12) was historically used for pesticide storage and mixing operations. The ROD was signed in 2005 and the remedy included an asphalt cover, LUCs and groundwater monitoring for arsenic for five years.The PAH area (OU 13) consists of a fuel oil spill area. The contaminants of concern include arsenic, dioxins and PAHs. The ROD was signed in 2011 and construction was completed in early 2014.