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Background concentrations of radionuclides, organic compounds, and inorganic chemical constituents in water in the Snake River Plain aquifer were estimated from ground-water sample analyses. Detectable concentrations of transuranic elements should not be present in water from the Snake River Plain aquifer. Background concentrations of tritium generally range from 75 to 150 pCi/L (picocuries per liter). Strontium-90 and iodine-129 concentrations generally are 0 and from 0 to 0.05 pCi/L, respectively. At the INEL (Idaho National Engineering Laboratory), comparison of the mean and median concentrations of tritium, strontium-90, and iodine-129 indicates that operations locally have affected concentrations in ground water. Gross alpha-particle and beta-particle radioactivity in water from the Snake River Plain aquifer range from 0 to 5 pCi/L and 0 to 8 pCi/L, respectively. Background gamma radiation in ground water is attributed to cesium137, cobalt-60, and potassium-40. Ground water at the INEL generally contains no cesium-137 or cobalt-60. Naturally occurring concentrations of potassium-40 probably are about 300 pCi/L. Background concentrations of organic compounds in water from the Snake River Plain aquifer generally are less than 0.2 /ig/L (micrograms per liter). Background arsenic and chromium concentrations both range are 2 to 3 /ig/L. Barium concentrations range from about 50 to about 70 /ig/L. Lead and mercury concentrations generally are less than 5 /ig/L and 0.1 /ig/L, respectively. Cadmium, selenium, and silver concentrations generally are less than 1 /ig/L. Nitrate concentrations range from 0 to about 1.4 mg/L (milligrams per liter).

water-resources investigations report

Background concentrations of selected radionuclides, organic compounds, and chemical constituents in ground water in the vicinity of the Idaho National Engineering Laboratory