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<br />: '"~'- <br />I.; u,~ <br /> <br />. <br /> <br />. <br /> <br />desalting ?lant with a capacity of 16 million gallons per day. Brines <br />could be disposed of by subsurface injection into deep wells. This <br />project would have an averaee annual cost of $5,000,000, and a unit <br />cost of $14 per ton of salt removed. <br />tbout 70 percent of the flow of La Verkin Springs, on the Virgin <br />River, could be captured. This quantity, about 7,000 acre-feet an- <br />nually containing about 80,000 tons of salts, would be conveyed to <br />an evaporation pond and thus eliminated from the river. This project <br />is estimated to have an average annual cost of $500,000, and a unit <br />cost of about $3 per ton of salt removed. <br />The largest natural point source in the Colorado River Basin is <br />Blue Sprines on the Little Colorado ~iver. A project to eliminate <br />its SOO,OOO-ton annual salt contribution could consist of a low dam <br /> <br />down stream of Blue Sprines to intercept the springs' flow, pumping <br /> <br /> <br />plants and conveyance facilities to transport the water to Flaestaff, <br /> <br /> <br />and a desaltine plant at Flagstaff where the desalted water would be <br /> <br /> <br />sold. This project would have an average annual cost of $16 million <br /> <br /> <br />or $32 per year per ton of salt removed. The project also has pos- <br /> <br /> <br />sibilities for incorporation of pump storage and power recovery <br /> <br /> <br />features. <br /> <br />Completion of all projects would eliminate 2.8 million tons of <br /> <br /> <br />salt annually from the Colorado River and its tributaries upstream <br /> <br />of Hoover Dam. Construction of irrigation improvements would result <br /> <br />in salvage of water; however, the other projects woul<l C"luse 8. loss <br /> <br />of approximately 22,000 acre-feet per year. <br /> <br />-12- <br />