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Record of Decision System (RODS)

IDAHO NATIONAL ENGINEERING LABORATORY (USDOE)

Abstract

Site Name:  IDAHO NATIONAL ENGINEERING LABORATORY (USDOE)
Address:  AEC TESTING RESERVATION
US HWY 20/26 40 MI W OF IDAHO FALLS 
City & State:  IDAHO FALLS  ID  83401
County:  BUTTE,CLARK,JEFFERSON,BIN
 
EPA ID:  ID4890008952
EPA Region:  10
 
NPL Status:  Currently on the Final NPL
 
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R10-93/058
ROD Date:  12/31/1992
Operable Unit(s):  09
 
Media:  None
 
Contaminant:  None
 
Abstract:  The USDOE Idaho National Engineering Laboratory (Operable Unit 9), is part of the 890-square mile U.S. Department of Energy (USDOE) facility, located in Idaho Falls, Idaho. The primary mission of the Idaho National Engineering Laboratory (INEL) is nuclear reactor technology development and waste management. Land use in the area is predominantly industrial, with some restricted agricultural and recreational uses. The site is contained within the northeastern portion of the Eastern Snake River Plain (ESRP) and borders a floodplain to the west and north, and overlies the Snake River Plain Aquifer, which is a sole-source aquifer. The site, also known as the Central Facilities Area (CFA) Motor Pool Pond, is an administrative and support area that includes security facilities, environmental chemistry laboratories, a motor pool and maintenance shop, a general warehouse, and other support facilities. From 1951 until 1985, the site's CFA Motor Pool Pond received wastes from two sumps that collected wastewater from the washing of fleet vehicles and from roof downspouts. During the 35year service life of the Motor Pool Pond, an estimated 15,900 liters of wastewater, containing metals and organic compounds associated with road dust, oil, grease, and some residual radioactive contamination, per day were discharged into the pond. In late 1985, the waste was diverted through an oil/water separator to a sanitary sewer line connected to the Sewage Treatment Plant, and onsite discharge to the CFA Motor Pool Pond ceased. Studies conducted in 1982, 1988, and 1989 by USDOE indicated that the CFA Motor Pool Pond sediment and soil were contaminated with VOCs, other organics, metals, and radionuclides. Radiological surveys conducted in 1991 indicated only background levels of radiation. Previous 1992 RODs addressed sediment at the Warm Waste Pond, ordnance and contaminated soil, contaminated ground water at the Technical Support Facility, and contaminated sediment and sludge in the evaporation pond, discharge pipe, and waste sump as OUs 5, 23, 2, and 22, respectively. This ROD addresses the CFA Motor Pool Pond, including the excavated soil and sediment along the ditch, in the ditch, at the discharge pipe outlet, and in the pond, as OU9. Other 1993 RODs addresses the Perched Water System, the CFA Motor Pool Pond and Pit 9 of the Subsurface Disposal Area, as OUs 4, 9, and 18 respectively. Future RODs will address any impacts from past releases to the pond that may affect the subsurface or ground water. Based upon the results of the RI and risk management considerations, therefore, there are no contaminants of concern affecting this site. SELECTED REMEDIAL ACTION: The selected remedial action for this site is no further action because risk data obtained during the RI indicate that the contaminated sediment within the CFA Motor Pool Pond poses no unacceptable risk to human health and the environment. There are no present worth or O&M costs associated with this no action remedy. PERFORMANCE STANDARDS OR GOALS: Not applicable. INSTITUTIONAL CONTROLS: Not applicable.
 
Remedy:  The DOE has determined that no further remedial action is necessary at the CFA Motor Pool Pond to ensure protection of human health and the environment. This decision is based on the results of the human health and ecological risk assessments, which indicate that conditions at the site pose no unacceptable risk to human health or the environment. The EPA has approved the DOE decision; the IDHW concurs.
 
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