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:||Sediment, Soil, Surface Water|
|Contaminant:||Metals, Nitroaromatics, PAH, Pesticides|
Please note that the text in this document summarizes the Record of Decision for the purposes of facilitating searching and retrieving key text on the ROD. It is not the officially approved abstract drafted by the EPA Regional offices. Once EPA Headquarters receives the official abstract, this text will be replaced.
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.
Operable Unit 1 (OU1):
Site 5, the Surplus Transformer Storage Area, is located near Barracks Road in the northeastern portion of the facility adjacent to the south end of Building 76. Site 5 is approximately 1,000 square feet in size and is fenced and covered with gravel. Site 5 was used to store surplus polychlorinated biphenyl (PCB)-containing electrical transformers from 1940 to 1981. After 1981, only non-leaking transformers were stored at this location. Currently, no transformers are stored at the site. An estimated 300 pounds of PCB-containing fluid leaked from transformers stored at Site 5 over time. A cleanup effort conducted under the direction of the Navy in December 1982 included the removal of contaminated soils. The amount of soil removed is not known. Subsequent investigations indicate the removal action was effective. A Record of Decision (ROD) completed in September 1994 presented the no action remedial alternative.
Site 9 consists primarily of a discharge area that had been used as a drainage by Plant 1. The Site 9 drainage ditch ultimately empties into Lee Pond. Lee Pond drains into the eastern branch of Felgates Creek, which in turn flows northward to the York River, approximately 1.5 miles from Site 9. Explosives-contaminated wastewater and organic solvents may have been discharged from Plant 1 into the drainage way from the 1930s to 1975. In 1974, a carbon adsorption tower was installed to treat the contaminated wastewater emanating from Plant 1 prior to discharge to the drainage way. In 1986, treatment tower discharge was diverted to the sanitary sewer and ultimately to the Hampton Roads Sanitation District (HRSD). In September 1994, a removal action was conducted at Site 9 to address soil and miscellaneous debris at the lower end of the drainage way before it crosses Bollman Road.
Site 19 consists of soil surrounding a conveyor belt, which was formerly used to transport packaged TNT powder from Plant 1 to Building 98. Several buildings and sheds are located within the Site 19 study area. An undocumented quantity of TNT-contaminated soil beneath and around the belt was voluntarily excavated and removed in 1973-1974 by Station personnel.
A ROD addressing soil, surface water, and sediment at Site 9, and soil at Site 19 was completed in March 1998.
The Site 12 study area encompasses 92 acres and is located near the Industrial Area of WPNSTA Yorktown. The study area is bordered by Barracks Road to the west, and Ballard Creek and Colonial National Historical Park to the east and south. Site 12 proper contains three former disposal areas named Area A, Area B/C, and the Wood/Debris Disposal Area.
Several stream channels drain Site 12. All of these channels drain into Ballard Creek which defines the southern boundary of the Site 12 study area and directs surface water northeast to the York River. Industrial Area operations have had an impact on the shallow groundwater that flows from the Industrial Area toward Site 12 and ultimately to Ballard Creek.
The former disposal areas at Site 12 were in operation from approximately 1925 to the mid-1960s. During this time, the disposal areas received an estimated 1,400 tons of waste. Wastes reported to have been disposed at the three areas include refuse, scrap wood, piping, steel containers, and nitramine-contaminated packaging. It is likely that solvents were also disposed of at these areas. Activities at Area A included wastes being transported to the site by truck and railcar and open-burned prior to disposal, and burning of wastes in the two incinerators, which also were located in Area A. The Wood/Debris Disposal Area was reportedly used for disposal of non-specification lumber, wooden pallets, and miscellaneous construction debris.
Previous investigations conducted at Site 12 resulted in an April 1997 ROD.
OU5 is comprised of Site 16, which is the 5-acre West Road Landfill, and the Site Screening Area (SSA) 16, which is Building 402 Metal Disposal Area. Site 16 was operated in the 1950s and 1960s as a dump site. SSA 16 was used reportedly used for waste container storage prior to the remodeling and conversion of Building 402 into a hazardous waste storage facility. No housing currently exists at Site 16/SSA 16.
A Remedial Investigation (RI) was conducted simultaneously for Site 16 and SSA 16. The Feasibility Study (FS) which normally follows the RI, was not performed at Site 16/SSA 16, since no unacceptable risk to human health or the environment was present under the current and predicted future land use for WPNSTA Yorktown (i.e., industrial). A ROD was completed in September 1995 that addressed Site 16/SSA 16.
The selected remedy for Site 9 is no action. The selected remedy for the cleanup of explosives-contaminated soil at Site 19 requires the dismantling and disposal of the conveyor belt at Site 19 and the excavation of 2,4,6-TNT contaminated soil greater than or equal to 15 mg/kg and hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) contaminated soil greater than or equal to 5 mg/kg. Soil shall be excavated along the entirety of the conveyor belt (and in the near vicinity of the conveyor belt to a depth (based on limited sampling), but samples shall be taken throughout the area of excavation during remediation to confirm concentrations in underlying soil. Test kits shall be used to obtain real time data in the field. Soil having exceedences of RLs shall be removed and transported to the Site 22 biocell for biological treatment and reuse. Aluminum detected in soil around Building 527 exceeding 14,830 mg/kg (the Station-wide background) shall be excavated to a depth of approximately 6 inches below ground surface (bgs). The soil shall be placed in the deeper excavated area. Clean fill shall then be placed in all areas of excavation and the area shall be regraded and vegetated to prevent erosion. The extent of 2,4,6-TNT, RDX and aluminum contamination in soil shall be determined during remediation and sampling and analysis information will be presented in the Remedial Action Work Plan.
Soil shall be treated biologically at Site 22 to the RL values used to determine the area of excavation at Site 19. The soil shall then be dewatered and used as clean fill at Site 22, not Site 19. Currently property use is restricted by the location of the site (Site 19 is in the restricted area). Property use restrictions shall be added to the Station Master Plan to preclude future residential development of Site 19.
The selected remedy for Site 9 is no action.
Estimated Capital Cost: $883,000
Estimated O & M Cost: $0
Estimated Present Worth Cost: $883,000
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