Record of Decision System (RODS)
NAVAL WEAPONS STATION - YORKTOWN
|Site Name:||NAVAL WEAPONS STATION - YORKTOWN|
|Address:||US NAVAL WEAPONS STA|
|City & State:||YORKTOWN VA 23690|
|NPL Status:||Currently on the Final NPL|
|ROD Type:||Record of Decision|
|Media:||Groundwater, Sediment, Soil, Surface Water|
|Contaminant:||Inorganics, Metals, PAH, Pesticides, VOC|
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.
For Site 1:
The selected remedy for Site 1 includes the removal and disposal and/or recycling of surface debris, excavation and off-site disposal of the arsenic-contaminated soil hot spot, restoration of the soil cover currently over Site 1, and implementation of institutional controls. Prior to excavation, the soil will be tested to determine if it is a hazardous by characteristic in accordance with the Resource Conservation Recovery Act (RCRA) 40 CFR Part 261, Subpart C. Based on the test results, the excavated soil will be stored appropriately on-site prior to being transported off-site and an appropriated off-site disposal facility will be selected. All arsenic-contaminated soil exceeding the remediation
level of 63 mg/kg (i.e. the arsenic hot spot) will be excavated. Approximately 105 cubic yards of arsenic contaminated soil will be removed. During the excavation activities, a minimum of 10 confirmatory soil samples will be collected and analyzed for arsenic to determine the extent of contamination. All excavated soil will be transported to a permitted off-site disposal facility, as discussed above. The excavation area together will be backfilled with clean soil from the Naval Weapons Station's borrow pit. The backfilled areas will be covered with six inches of
topsoil and revegetated with native grasses. An estimated 3,300 cubic yards of clean soil fill and 800 cubic yards of topsoil will be required to fill the excavation and restore the soil cover at Site1. Institutional controls, in the form of land use controls will be implemented at Site 1. The site will be reviewed every five years after the remedial activities have begun.
For Site 3:
The selected remedy for Site 3 includes soil excavation with off-site disposal, debris removal, and institutional controls. PAH-contaminated soil exceeding the 10 mg/kg remediation level will be transported off-site to a permitted disposal facility. Prior to excavation the soil will be tested to determine if the soil is hazardous by characteristic in accordance with the RCRA regulations at 40 CFR Part 261, Subpart C. Based on the test-results, the excavated soil will be stored appropriately on-site prior to being transported off-site and an appropriate off-site disposal facility will be selected. Approximately 90 cubic yards of PAH-contaminated soil will be removed from the hot spot area measuring approximately 60 feet by 20 feet by 2 feet dep. During the excavation activities, a minimum of six soil samples will be collected and analyzed for PAHs to determine the extent of contamination. All PAH-contaminated soil exceeding the remediation level of 10 mg/kg total carcinogenic PAHs will be excavated. The excavated areas will be backfilled with clean soil from the Station's borrow pit. The disturbed area will be covered with six inches of topsoil and vegetated with native grasses. Site restoration activities will require approximately 25 cubic yards of topsoil. In addition, all surface debris and debris encountered during the hot spot excavation will be disposed off-site or recycled. Institutional controls, in the form of land use controls, will be implemented at Site 3. The site will be reviewed every five years after the remedial activities have begun.
Estimate Capital Cost (For Site 1): $190,000
Estimate Capital Cost (For Site 3): $154,500
Estimated Annual O&M Costs: $5,500
Estimated Present Worth Costs: $270,000
Other Costs: N/A
Under the "No Action" RAA, arsenic contaminated soil and surficial debris at site will remain in place. No remedial efforts will be conducted to reduce the arsenic contamination exceeding the remediation level of 63 mg/kg, to eliminate surface debris, or to restore the eroded portions of the existing soil cover at the site. No actions will be
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