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<br />'. <br /> <br />. <br /> <br />. <br /> <br />SUMMARY <br /> <br />This report presents the status of the Reject Stream Replacement <br />N <br />N Study as of January 1978. It also serves as a reference document of <br />(() <br />CO the investigation process which formulated the viable alternatives that <br /> <br />will be studied during the next, more detailed, feasibility stage of the <br /> <br />project. <br /> <br />Authorization for the Study, encompassed in the Colorado River <br /> <br />Basin Salinity Control Act of June 24, 1974, directed the Secretary of <br /> <br />the Interior to identify a feasible measure, or measures, which could <br /> <br />adequately replace that water lost through reject from the proposed <br />Yuma Desalting Plant. <br /> <br />The source of any such replacement water was limited by the Act <br /> <br />to the States of Arizona, California, Colorado, New Mexico, and those <br /> <br />portions of Nevada, Utah, and Wyoming which are within the natural <br /> <br />drainage basin of the Colorado River. The Act also specified a study <br /> <br /> <br />completion date of not later than June 30, 1980. <br /> <br />In addition to these two criteria set forth in the Act, a third <br /> <br />factor, the maximum quantity of replacement water necessary, needed <br /> <br />to be established as a basis for the identification of possible replace- <br /> <br />ment sources. Hydrologic computer modeling, previously undertaken <br /> <br />to determine desalting plant design specifications, had identified <br /> <br />42,000 acre-feet per year as the maximum amount of reject that could <br /> <br />be expected from the plant during years of maximum production. It <br />was necessary, therefore, to identify replacement sources which could <br /> <br />provide 42,000 acre-feet of water in any given year. Continued com- <br /> <br />puter modeling has since indicated that the actual design reject stream <br />