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<br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />t <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />3748 <br /> <br />Mineral springs, located on both banks of the Colorado <br />River approximately 2 1/2 miles below Dotsero, were responsible <br />for a salt load increase of about 163,000 tons per year. Springs <br />in the vicinity of Glenwood Springs added another 335,000 tons of <br />dissolved solids annually. <br /> <br />During the 1965-66 study periOd, 912,000 tons of dissolved <br />solids in the Colorado River at Cameo were attributed to natural <br />runoff. The lower reaches of Gypsum Creek, Roaring Fork, and <br />Eagle River were all identified as high source areas. These are <br />areas where the stream bed flows through the highly saline <br />Paradox formation outcrop. Approximately 1,410,000 tons of the <br />total salt load at Cameo was from natural sources. <br /> <br />Irrigation of 24,000 acres along the Colorado near <br />Kremmling, 7,000 acres on Muddy Creek, 21,000 acres in the <br />Roaring Fork Basin, and 16,000 acres along the Colorado River <br />upstream from Silt was responsible for salt loading of an <br />additional 166,000 tons per year. <br /> <br />Effluent discharged from the Union Carbide uranium mill near <br />Rifle, Colorado added about 15,000 tons of dissolved solids <br />annually to the river system. Seepage from tailings ponds at <br />this site contributed an undetermined amount of salts. The New <br />Jersey zinc mine and mill near Gilman discharged 4,000 tons per <br />year in the form of process waste. The annual salt load <br />attributable to man caused sources, at Cameo, approximated <br />185,000 tons. <br /> <br />-16- <br />