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Record of Decision System (RODS)



Address:  44CSC/DE 
City & State:  ELLSWORTH AFB  SD  57706
EPA ID:  SD2571924644
EPA Region:  08
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/541/R-97/111
ROD Date:  04/28/1997
Operable Unit(s):  11
Media:  Groundwater
Contaminant:  petroleum
Abstract:  Ellsworth Air Force Base (EAFB) is a U.S. Air Force Combat Command (ACC) installation located 12 miles east of Rapid City, South Dakota, and adjacent to the small community of Box Elder.EAFB covers approximately 4,858 acres within Meade And Pennington Counties and includes runways and airfield operations, industrial areas, and housing and recreational facilities. Open land, containing a few private residences, lies adjacent to EAFB on the north, south, and west, while residential and commercial areas lie to the east of the 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 with the 28th Strategic Reconnaissance Wing as its host unit. Historically, EAFB has been the headquarters of operations for a variety of aircraft, as well as the Titan I Intercontinental Ballistic Missile and the Minuteman I and Minuteman II missile systems. The Air Force has provided support, training, maintenance, and/or testing facilities at EAFB.
Remedy:  Operable Unit (OU) 11 has been divided into two areas to aid in project planning. Area 1 is the South Docks Study Area, and Area 2 is the BGO4 and BGO5 Study Areas.The selected alternative for Area 1, groundwater extraction and treatment with contaminant, includes the following major components: groundwater removal and treatment in the South Docks Study Area; on-base containment of groundwater containing contaminants at unsafe concentrations; and institutional controls and long-term monitoring.The selected alternative for Area 2, groundwater containment/extraction and treatment, includes the following major components: groundwater removal and treatment along the northeast base boundary and at areas of high contaminant concentrations on base; natural attention of low containment concentration areas, primarily off base; alternative water supply to residents affected by contamination coming from the base; additional investigation to determine the eastern extent of off-base groundwater contamination; and institutional controls and long-term monitoring.
Text:  View full-text ROD [ 99K ]
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