6.6 DOE Test Area North, INEEL, Idaho – Remediation Management of Complex Sites
From 1950 to 1972, all liquid waste streams generated at TAN were introduced directly into the basalt aquifer (Snake River Plain Aquifer), approximately 200–300 feet below ground surface, through injection wells. Waste streams included low-level radioactive wastewater, industrial wastewater (including organic liquids), and sanitary sewage. Historical records provide little information on the types and volumes of organic wastes injected into the groundwater; estimates of total TCE injection range from 350 to 35,000 gallons. The direct result of these injection activities was a two-mile trichloroethene (TCE, C2HCl3) plume at concentrations >20,000 µg/L.
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