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Record of Decision System (RODS)

NAVAL WEAPONS STATION - YORKTOWN

Abstract

Site Name:  NAVAL WEAPONS STATION - YORKTOWN
Address:  US NAVAL WEAPONS STA 
City & State:  YORKTOWN  VA  23690
County:  YORK
 
EPA ID:  VA8170024170
EPA Region:  03
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/541/R-99/011
ROD Date:  10/13/1998
Operable Unit(s):  02
 
Media:  Groundwater, Sediment, Soil, Surface Water
 
Contaminant:  Metals, Nitroaromatics, PAH, Pesticides, VOC
 
Abstract:  The Naval Weapons Station (WPNSTA) Yorktown is a 10,624-acre installation located on the Virginia peninsula in York County, James City County, and the City of Newport News.

WPNSTA Yorktown, originally named the U.S. Mine Depot, was established in 1918 to support the laying of mines in the North Sea during World War I. During World War II, the facility was expanded to include three additional trinitrotoluene (TNT) loading plants and new torpedo overhaul facilities. A research and development laboratory for experimentation with high explosives was established in 1944, and in 1947, a quality evaluation laboratory was developed. In August 1959, the U.S. Mine Depot was redesignated the U.S. Naval Weapons Station. Today, the primary mission of WPNSTA Yorktown is to provide ordnance, technical support, and related services to sustain the war-fighting capability of the armed forces.
 
Remedy:  Approximately 800 cubic yards of nitramine/nitroaromatic and inorganic contaminated soil and sediment were removed to levels appropriate for commercial/industrial use as part of a bioremediation pilot study conducted in 1996. Therefore, no further action is required for Site 7- drainage area (OU-12). Residential use is prohibited as part of the remedy.

The selected remedy for the cleanup for Site 6 - Flume Area (OU13) requires the excavation of nitramine/nitroaromatic, chlorinated volatile, and inorganic contaminated soil and sediment. In addition, ex situ bioremediation of soil and sediment excavated from Site 6-Flume Area will take place. Nitramine/nitroaromatics are readily degraded using this process, however chlorinated volatiles may be recalcitrant. The selected remedy also includes pressure washing of the trenches (SWMU 179), and residue removal and pressure washing of the trenches
under Building 109 (AOC C) for this site. The final step in the remedy selection includes removal of explosives contaminated residue from SWMU 179 and treatment by burning at the Station's thermal treatment unit. Residential use is prohibited as part of the remedy.

The selected remedy for the cleanup of Site 6- Excavated area includes; Grading and placement of backfill as a soil cover (min 8 inches) to prevent contact with cadmium and zinccontaminated surface soil by terrestrial ecological receptors. No long-term monitoring is necessary. Activities that interfere with or compromise the integrity of the cover at this site will be prohibited

The selected remedy for Site 6-Impoundment Surface Water and Sediment, Surface Water at Site 7, Groundwater at Sites 6 and 7 includes; long-term monitoring of surface water and sediment for nitramines/nitroaromatics and chlorinated volatile organics and inorganics. The specifics of this monitoring program are being addressed by the Navy, the EPA, and the State.

Estimated Capital Cost: $461,139
Estimated O&M Costs: $20,210
Estimated Present Worth Costs: $771,500

Excavation of nitramine/nitroaromatic, chlorinated volatile, and inorganic contaminated soil and sediment from the Site 6-Flume Area. Exsitu bioremediation of soil and sediment excavated from the Site 6-Flume Area. Habitat restoration of the Site 6-Flume Area. Grading and placement of backfill as a soil cover to prevent contact with cadmium and zinc contaminated surface soil. NFA at site 7 Approximately 800 cubic yards of nitramine/nitroaromatic and inorganic contaminated soil and sediment were removed as part of a bioremediation pilot
study conducted in 1996. Long term monitoring will be conducted for nitramines/nitroaromatics and chlorinated volatile organics and inorganics (including nickel and zinc) in the Site 6 impoundment area. Long-term monitoring of the groundwater throughout sites 6 and 7 for nitramines/nitroaromatics, chlorinated volatiles and inorganics will also be conducted, but this is not the final remedy for groundwater. GW at sites 6 and 7 will be addressed in a seperate OU after USEPA Region III completes a watershed study for Felgates creek which began in September 1998. Long term monitoring (LTM) of surface water at Site 7 for similar contaminants.
 
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