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Record of Decision System (RODS)

LANGLEY AIR FORCE BASE/NASA LANGLEY RESEARCH CENTER

Abstract

Site Name:  LANGLEY AIR FORCE BASE/NASA LANGLEY RESEARCH CENTER
Address:  OFF STATE HIGHWAY 187 
City & State:  HAMPTON  VA  23665
County:  HAMPTON CITY
 
EPA ID:  VA2800005033
EPA Region:  03
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/541/R-99/051
ROD Date:  09/02/1999
Operable Unit(s):  02
 
Media:  Soil
 
Contaminant:  PCBs
 
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:  The selected remedy involves the excavation of soil with polychlorinated biphenyl (PCB) concentrations greater than 10 parts per million (ppm), estimated at 212 cubic yards. The contaminated soil would be hauled to a permitted Toxic Substances Control Act (TSCA) permitted landfill for disposal. The excavated areas would be backfilled with clean fill material and regraded as needed to existing conditions. Use restrictions will be imposed to limit the site use to industrial purposes only. This will include the preparation of a survey plat which will state the land use restrictions that have been placed on the property and will indicate the boundaries of the operable unit (OU). This plat will be
submitted to the local recording authority. These use restrictions will also be incorporated into the National Aeronautics and Space Administration (NASA) LaRC Base Master Plan.

In addition, the presence of the existing security fence around the OU serves to limit access to the OU. Although the purpose of the fence around the OU is for providing security it also limits the individuals who may be exposed to the contaminated soils by preventing unauthorized access.

It is anticipated that the time required to achieve remedial action objectives for the selected remedy is 3 months; 2 months for the preparation and approval of the design; 1 week for site preparation; 1 week for excavation; and 1 week for demobilization.

Estimated Capital Cost: $294,000
Estimated Annual O&M Cost: $500
Estimated Present Worth Cost: $301,000

The NCP requires that no action alternative be considered to provide a baseline for comparison within action alternatives. Under this alternative, no remedial action would be undertaken at this time to address contaminated soil at the Stratton Substation OU.
Capital Cost: $0
O & M: $0
Net Present Worth: $0

This alternative involves the excavation of soil with concentrations greater than 10ppm, estimated at 190 cubic yards. Contaminated soils would be hauled to a permitted off-site facility for incineration. Excavated areas would be backfilled with clean fill material and regraded as needed. The presence of the existing security fence around the OU serves to limited access to the OU.
Capital Cost: $445,000
O & M: $500
Net Present Worth: $461,000
 
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