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<br />!. <br />I <br /> <br />l'\) <br />W <br />f-l. <br />co <br /> <br />. <br /> <br />. <br /> <br />IV . DESALTING PLANT IN IMPERIAL VALLEY <br /> <br />A desalting plant located in the Imperial Valley could <br /> <br />desalt enough water from either the New or Alamo <br /> <br />Rivers to provide a reject stream replacement source. <br /> <br />Product water would be pumped into the All-American <br /> <br /> <br />or East Highline Canals, depending on which river the <br /> <br /> <br />plant would be located. A total investment cost for this <br /> <br /> <br />alternative would vary, depending on the location of the <br /> <br /> <br />plant, type of treatment required, and method of dis- <br /> <br />posing the reject, from $43,000,000 to $118,000,000 and <br /> <br />would provide replacement water at a unit cost of from <br /> <br />$256 to $443 per acre-foot. Discharge of the plant's <br /> <br />waste stream, depending on the method, could have <br /> <br />adverse economic, hydrologic, or agricultural effects. <br /> <br />Description <br /> <br />Two sources for treating water in the Imperial Valley appear to <br /> <br />be available. One is the New River, which carries untreated sewage <br /> <br />and other wastes from the Mexican city of Mexicali, and the other <br /> <br />source is agricultural drainage water that flows into the Alamo River. <br />Historically, the City of Mexicali has discharged untreated sewage <br /> <br />and other wastes into the New River. which crosses the International <br /> <br />Boundary into Imperial Valley, California and flows into the Salton <br />Sea. It appears, from the limited amount of available data, that flows <br />may vary from about 110 ft3/s to about 200 ft3(s. There is no reason <br /> <br />to believe that flow quantities will decrease in the future since Mexicali's <br /> <br />19 <br />