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Record of Decision System (RODS)



Address:  OFF STATE HIGHWAY 187 
City & State:  HAMPTON  VA  23665
EPA ID:  VA2800005033
EPA Region:  03
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/541/R-99/060
ROD Date:  09/27/1999
Operable Unit(s):  50
Media:  Groundwater, Soil
Contaminant:  Metals, PAH, PCBs, Pesticides, VOC
Abstract:  The National Aeronautics and Space Administration NASA Langley Research Center (LaRC) is a 787-acre NASA research center located in southeastern Virginia in the Hampton Roads area. It is bounded by State Route 172, Brick Kiln Creek, and Langley Air Force Base (AFB). NASA LaRC together with Langley AFB was finalized on the National Priorities List (NPL) in 1994. Groundwater in the area can be found at a depth of 5 to 50 feet below the land surface. This aquifer, known as the Columbia Aquifer, is brackish and is limited to lawn and garden watering. Both the Yorktown and the Yorktown-Eastover Aquifers underlie the Columbia Aquifer. The Yorktown-Eastover Aquifer is confined and is used as a source of domestic potable water.

The primary function of NASA LaRC is research and development of advanced technologies for aircraft and spacecraft. In conducting its research and development mission, NASA LaRC requires many support facilities including underground storage tanks (USTs) for fuel and other raw products, power plants, wind tunnels, laboratories and administrative buildings. All of these facilities have the potential to impact the environment through disposal activities, transfer operations and inadvertent releases such as spills or mechanical malfunctions.
Remedy:  This remedial action includes institutional controls, land use restrictions, qualified supervision, and health and safety precautions. Restrictions in the plan include land use restrictions to prevent non-industrial use of the property, with the exception of the non-residential waterfront development plans, and ground water use restrictions with the exception of monitoring. It also calls for a survey plat done by a professional surveyor indicating the location and dimensions of Operable Unit-50, and the Air Force incorporating these restrictions into any real property documents necessary for transferring ownership. A copy should be provided to the United States in the unlikely event the
property is sold. Ground water monitoring would also take place as an interim action to ensure contaminated ground water is not impacting the Back River. The frequency and duration of sampling will be determined in a subsequent remedial design.

Estimated Capital Cost: $27,000
Estimated Annual O&M cost: $24,000
Estimated Present Worth Cost: $396,000

The NCP requires that a "no action" alternative be considered to provide a baseline for comparison with action alternatives. Under this alternative, no remedial action would be undertaken to address contaminated soil and groundwater.
Capital Cost: $0
O & M: $0
Net Present Worth: $0

This alternative includes institutional controls. Soils were evaluated for worker exposure, the use of this property would be restricted to industrial use. These restrictions include: 1) land use restrictions; 2) groundwater use restrictions; 3) Air Force shall produce a survey plat, indicating location and dimensions and extent of soil & groundwater contamination; 4) the Air Force will incorporate these restrictions and supply a copy of the plat into any property documents. Public Awareness training will be developed.
Capial Cost: $27,000
O & M: $14,000
Net Present Worth: $ 242,000

This alternative includes groundwater extraction through an extraction well or recovery trench system. Extracted groundwater will pass through a granular media filteration (GMF) system to remove suspended solids. Filtered water will be treated in a low-profile air stripper to remove the volatile organic compounds. Treated groundwater would be discharged to the Back River. Sludges resulting from the filteration system would be characterized and disposed of. This alternative would require future institutional controls. Groundwater use restrictions would be implemented until completion of remedy.
Capital Cost: $325,000
Text:  View full-text ROD [ 207K ]
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