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Record of Decision System (RODS)



City & State:  IDAHO FALLS  ID  83401
EPA ID:  ID4890008952
EPA Region:  10
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R10-92/045
ROD Date:  09/28/1992
Operable Unit(s):  02
Media:  Ground Water
Contaminant:  VOCs, Metals, Radioactive Materials
Abstract:  SITE HISTORY/DESCRIPTION: The 890-square-mile U.S. DOE Idaho National Engineering Laboratory (INEL) is located 32 miles west of Idaho Falls, Idaho. The site, established in 1949, is operated as a nuclear reactor technology development and waste management facility by the U.S. Department of Energy. Land use in the area is predominantly industrial and mixed use. The site overlies a sole source Class I aquifer, the Snake River Plain Aquifer. A 10-mile-square area within the INEL complex, referred to as Test Area North (TAN), was built in the 1950's to support the Aircraft Nuclear Propulsion Program sponsored by the U.S. Air Force and Atomic Energy Commission. Within TAN, the Technical Support Facility (TSF-05) injection well was used to dispose of industrial and sanitary wastes and wastewatersfrom 1953 to 1972. Types of wastes disposed of in the well included low- level radioactive and process wastes, corrosive wastewater, ignitable wastes, chromium, lead, and mercury. Contaminants, including TCE, PCE, tritium and strontium-90, were first detected above MCLs in the ground water in 1987. Based on these results, a RCRA Corrective Action Program was subsequently developed to address ground water contamination at TAN, which included installation of an air sparging system in the water supply tank at the TSF to ensure that organic contaminant concentrations remain below regulatory levels. Ground water sampling and monitoring continued through 1990, and contaminated sludge from the lower 55 feet of the TSF-05 injection well was removed and analyzed in 1990. Currently, the TSF-05 injection well is closed securely and locked, and the well head has been sealed against surface water intrusion. The INEL site is divided into 10 Waste Area Groups (WAGs). Two RODs in 1991 and 1992 addressed an interim remedy for Warm Waste Pond sediment in WAG 2 and an interim remedy for unexploded ordnance and soil contamination in WAG 10. This ROD provides an interim remedy for ground water contamination near the TSF-05 injection well (WAG 1). The primary contaminants of concern affecting the ground water are VOCs, including TCE and PCE; metals, including lead; and radioactive materials. PERFORMANCE STANDARDS OR GOALS: Chemical-specific ground water clean-up goals, which are based on SDWA MCLs, and include TCE 5 ug/l; PCE 5 ug/l; lead 50 ug/l; and strontium[-90] 300 pCi/l. Air emissions also will be monitored and will not exceed state air quality standards, which include TCE 0.00051 lb/hr, PCE 0.013 lb/hr, lead 1.5 ug/m[3]; and strontium[-90] 10 mrem/yd. INSTITUTIONAL CONTROLS: Institutional controls will be implemented at the site to restrict ground water use during these interim remedial activities.
Remedy:  SELECTED REMEDIAL ACTION: The selected remedial action for this site includes pumping the contaminated ground water from the injection well and treating the ground wateronsite using filtration to remove suspended solids, followed by air stripping and carbon adsorption to remove organics, and ion exchange to remove inorganics and radionuclides; modifying the existing TAN onsite disposal pond to receive treated ground water and ensure that it does not exceed discharge limits; transporting any spent carbon offsite to a permitted facility for regeneration; installing two additional ground water monitoring wells within the contaminant plume; monitoring air emissions; and implementing administrative and institutional controls, including ground water use restrictions. The estimated capital cost for this remedial action is $7,715,000, with a total O&M cost of $3,194,000 for 2 years.
Text:  View full-text ROD [ 55K ]
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