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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-97/195
ROD Date:  03/12/1997
Operable Unit(s):  01
Media:  Surface soil,subsurface soil,groundwater,surface water/seeps,sediments
Contaminant:  VOCs, SVOCs, pesticides, polychlorinated biphenyls (PCBs), metals and radionuclides. Site IHSS 119.1: carbon tetrachloride; 1,1-dichlorethene; tetrachloroethene; 1,1,1-trichlorethane; trichlorethene; and selenium
Abstract:  Rocky Flats Plant (USDOE) is a government-owned, contractor-operated facility that is part of the nationwide nuclear weapons complex. The site was operated for the U.S. Atomic Energy Commission (AEC) from its inception during 1951 until the AEC was dissolved in 1975. Responsibility for Rocky Flats was then assigned to the Energy Research and Development Administration (ERDA), which was succeeded by the Department of Energy (DOE) in 1977. The Rocky Flats Environmental Technology site is located approximately 16 miles northwest of downtown Denver, in northern Jefferson County, Colorado. Most Rocky Flats structures are located within the industrialized area of Rocky Flats, which occupies approximately 400 acres and is surrounded by a buffer zone of approximately 6,150 acres. OU 1 is located adjacent to and on the south side of the Rocky Flats industrial area, on the hillside south and east to Building 881, and north of Women Creek.Until 1992, operations at Rocky Flats consisted of fabrication of nuclear weapons components from plutonium, uranium, stainless steel, and beryllium. Building 881, which is adjacent to Operable Unit (OU) 1, was used for enriched uranium operations and stainless steel manufacturing. Support activities at Rocky Flats included chemical recovery and purification of recyclable transuranic radionuclides and research and development in metallurgy, machining, nondestructive testing, coatings, remote engineering, chemistry, and physics. These activities resulted in the generation of radioactive, hazardous, and mixed wastes. On-site storage and disposal of these wastes has contributed to hazardous and radioactive contamination in soils, surface water, and groundwater. During 1992, as an interim action, a French Drain was constructed across a portion of OU 1 to protect Women Creek from contaminated groundwater present in OU 1. The French Drain, along with an extraction well, collects contaminated groundwater moving towards Women Creek. The collected groundwater is transported to an ultraviolet/hydrogen peroxide and ion-exchange water treatment system located in Building 891. In addition, during 1994, plutonium contaminated surface soil "hot spots" were removed from OU 1.
Remedy:  The action addresses the principal threat posed by OU 1 by excavating subsurface soil contamination at Industrial Hazardous Substance Site (IHSS) 119.1, a former drum and scrap metal storage area, thereby removing the current source of groundwater contamination. The major components of the selected remedial action at IHSS 119.1 (Soil Excavation and Groundwater Pumping) include: excavation of approximately 1,000 to 2,000 cubic yards of contaminated subsurface soils at IHSS 119.1; extraction and then ultraviolet/hydrogen and ion-exchange treatment of contaminated groundwater from the excavation; and either thermal-treatment and replacement of excavated soil into the original excavation, disposal of excavated soil in an on-site waste disposal cell, or off-site disposal of excavation.
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