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<br />.G~,:;'553 <br /> <br />TABLE 2 CONTINUED <br />COLORADO RIVER INTAKE <br />Pumping Costs <br /> <br />~: <br /> <br />Highest Construction Costs <br /> <br />No Delivery Charge <br /> <br />Environmental benefits for <br />maintaining flows in River <br />below Laguna Dam <br /> <br />In-stream flow losses <br /> <br />If Desalting Plant used in <br />combination with a city Plant <br />Yuma would have a second water <br />source reducing risk of <br />interruption. <br /> <br />Operation costs for silt <br />removal. <br /> <br />Based on least costs for both construction and operation, and on -J <br />highest reliability the All-American Canal was selected as the <br />preferred intake. <br /> <br />(*** DESALTING PLANT ALTERNATIVES WILL ASSUME THE ALL-AMERICAN <br />CANAL AS THE INTAKE SOURCE FOR COLORADO RIVER WATER ***l <br /> <br />PRE/POST TREATMENT REQUIREMENTS <br />The state of Arizona, through the Department of Environmental <br />Quality (ADEQl, enforces the 1986 Amendments to the Safe Drinking <br />Water Act. These amendments require potable water supplies meet <br />maximum contaminant levels for turbidity, microorganisms, <br />inorganic and organic chemicals, and radionuclides with <br />compliance dates ranging from January I, 1991 to March I, 1994. <br /> <br />The treated water delivered to the city will meet the ADEQ <br />requirements for both the desalted high salinity Well ton-Mohawk <br />water and low salinity All-American Canal water. <br /> <br />CHEMICAL OPTIONS FOR CLARIFYING <br />During desalting operations, the existing partial lime softening <br />will be used for softening and to facilitate coagulation and <br /> <br />17 <br />