Record of Decision System (RODS)
ELLSWORTH AIR FORCE BASE
|Site Name:||ELLSWORTH AIR FORCE BASE|
|City & State:||ELLSWORTH AFB SD 57706|
|NPL Status:||Currently on the Final NPL|
|ROD Type:||Record of Decision|
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.
Ellsworth Air Force Base (EAFB) was officially activated in July 1942 as the Rapid City Army Air Base, a training facility for B-17 bomber crews. It became a permanent facility in 1948 and historically has been the headquarters of operations for a variety of aircraft. The Air Force has used EAFB for support, training, maintenance, and/or testing facilities. It is still an active Air Force Base.
Operable Unit (OU) 10 is the North Hangar Complex, a 75-acre site located in the central portion of the Base, northeast of the primary instrument runway. The complex was constructed in the 1950s and is composed of five rows of aircraft repair and maintenance hangars. Most of OU 10 is paved with concrete with some grassy areas between the hanger rows. No surface water is present at OU 10. The area contains a system of underground jet-fuel hydrant lines that deliver fuel to docking aircraft. The primary source of contamination at OU 10 is the fuel distribution system. Additional contaminant source areas include the aircraft maintenance areas and underground industrial waste lines. It was reported that waste products used for aircraft maintenance may have been washed down floor drains in the maintenance buildings. One study focused on determining if these waste products were then discharged into the soil beneath the maintenance area and to determine if contaminants had leaked from the underground industrial waste lines.
In 1993 and 1994 a study was conducted to characterize conditions at OU 10. The program included drilling and sampling of boreholes, installation of groundwater monitoring wells, groundwater sampling, geotechnical analysis of soil samples, ecological evaluation, assessment of human health risks, and review and compilation of previous investigations. Collection and laboratory analysis of soil and groundwater samples were also included in the program.
|Remedy:||The selected remedy for OU 10 is No Action. Media affected solely by petroleum hydrocarbon contamination will be addressed through State of South Dakota programs for Underground Storage Tank removal and /or petroleum contaminated soils. Groundwater cleanup will be addressed as part of the base wide groundwater OU 11.|
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