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Record of Decision System (RODS)



City & State:  GOLDEN  CO  80402
EPA ID:  CO7890010526
EPA Region:  08
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/541/R-97/196
ROD Date:  06/03/1997
Operable Unit(s):  03
Media:  Surface water,soils,surface soils,sediment
Contaminant:  Plutonium, uranium, beryllium, lathe coolants, radionuclides
Abstract:  The Rocky Flats Environmental Technology Site (RFETS) is a government-owned, contractor-operated facility that is part of the nationwide nuclear weapons manufacturing complex. RFETS began operation in 1951 under the Atomic Energy Commission, until it was dissolved in 1975. Prior to 1992, RFETS engaged in the production of nuclear and non-nuclear components of atomic weapons, using plutonium, uranium, beryllium and stainless steel as the primary materials.RFETS is located about 16 miles northwest of downtown Denver, Colorado, in northernmost Jefferson County, west of the Cities of Broomfield and Westminster, Colorado. RFETS occupies approximately 6,535 acres of land owned by the federal government. Most of this land is vacant buffer zone surrounding a 385-acre industrial area, where most buildings and other structures are located, and where manufacturing activities at RFETS historically took place.Portions of Operable Unit (OU) 3 contain low-level deposits of radionuclides, primarily as a result of accidental releases from RFETS in the past. Migration via wind-borne dispersal or surface water runoff from the RFETS 903 Pad area is a likely source for some of the observed radionuclides in the OU 3 Individual Hazardous Substance Sites (IHSS's). The deposits of radionuclides at the 903 Pad, located near the RFETS inner east gate, resulted from the storage of numerous 55-gallon drums containing lathe coolants and plutonium. These drums were stored at the 903 Pad from 1958 to 1968, during which time the drums corroded and the lathe coolant and plutonium leaked onto surrounding soils.Reconstruction of the RFETS surface water holding ponds between 1970 and 1973 is also a primary source of some of the deposits of radionuclides observed in IHSS 200. Prior to 1979, process wastewater from decontamination operations and the laundry plant effluent were channeled through a series of ponds located along the South Walnut Creek, before the stream left RFETS and entered Great Western Reservoir. The holding pond reconstruction may have resulted in the resuspension of sediments containing radionuclides that were ultimately transported downstream into Great Western Reservoir.
Remedy:  The selected remedy for OU 3 is no action. Based upon the Baseline Risk Assessment and the Environmental Risk Assessment, it has been determined that no action is needed for OU 3. The RFI/RI Report concludes that all IHSS's within OU 3 are already in a state protective of human health and the environment. Therefore, no remedial action regarding OU 3 or any of its constituent IHSS's is warranted.
Text:  View full-text ROD [ 49K ]
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