Scientific Investigations Report 2006-5122

Scientific Investigations Report 2006-5122

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Table 1. Summary of surface and subsurface wastewater disposal at selected facilities, Idaho National Laboratory, Idaho.

[Estimated disposal quantities: Estimated disposal quantities for Test Area North, Test Reactor Area, and Idaho Nuclear Technology and Engineering Center from French and others (1999). Estimated disposal quantities for the Radioactive Waste Management Complex from Mann and Knobel (1987) and Becker and others (1998). Contaminant concentrations from Mann and Beasley (1994), Bukowski and others (1998), and Bartholomay and others (2000). Abbreviations: MCLs, U.S. Environmental Protection Agency maximum contaminant levels for drinking water; Ci, curies; 137Cs, cesium-137; 3H, tritium; 90Sr, strontium-90; TCE, trichloroethene; PCE, tetrachloroethene; DCE, cis- and trans-1,2-dichloroethene; Cr, chromium, 129I, iodine-129; CCl4, carbon tetrachloride; gal, gallon]

Facility Disposal site Years of disposal Estimated disposal quantities Contaminants with concentrations exceeding MCLs in ground water
Test Area North Well, pond 1953 to 1993 61 Ci 717 million gal 137Cs, 3H, 90Sr, TCE, PCE, DCE
Test Reactor Area Well, ponds 1952 to present 53,879 Ci 5,180 million gal 3H, Cr
Idaho Nuclear Technology and Engineering Center Well, ponds 1952 to present 22,254 Ci 19,165 million gal 3H, 90Sr, 129I
Radioactive Waste Management Complex Excavation pits, trenches 1952 to present 1,532,600 Ci 0.09 million gal CCl4

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