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<br />Uo c ~-S-T2- - <br /> <br />PREVIOUS STUDIES <br />Internal studies are being conducted to consider alternatives for <br />reducing the operating costs. These alternatives attempt to <br />directly reduce the operating costs and include increasing the <br />efficiency of the Reverse Osmosis units, structuring the power <br />needs and contracts to take advantage of discount power rates, <br />considering optional power sources such as solar ponds or co- <br />generation, and increasing irrigation efficiencies to reduce <br />return flows and optimizing the effective interaction of the <br />Desalting Plant with the return flows. These ,internal studies <br />are continually on-going and as measures are identified and <br />proven feasible they are considered for implementation. <br /> <br />Another direction for reducing costs would be to focus on <br />increasing the usefulness of the Desalting Plant and defray the <br />operating costs over multiple users. <br /> <br />CITY OF YUMA <br /> <br />BACKGROmm <br />The City of Yuma has a contract with the Secretary of the <br />Interior for the diversion of up to 50,000 acre- feet of Colorado <br />River water. Water was diverted directly from the river adjacent <br />to the city's Main Street Treatment Plant until late ~96~. At <br />~ that time, the water became too saline for municipal use. Early <br />in ~962 the city contracted with the Yuma County Water Users' <br />Association for the delivery of water through the Yuma Project <br />irrigation facilities. This water is diverted at Imperial Dam <br />passes through the All-American Canal Desilting Basins and is <br />transported through the All-American Canal, Yuma Main Canal, and <br />Colorado River siphon. The water is then pumped from the outlet <br />of the siphon to the Main Street Treatment Plant (Main Street <br />Plant) which has a design capacity of 20 Mgalfd. The City is <br />also served by the East Mesa Treatment plant which has a capacity <br />of ~ Mgalfd. . <br /> <br />CAROLLO REPORT <br />In ~989 the treatment plants were stressed to their hydraulic <br />limits in providing for a maximum day demand of 26.5 Mgalfd. An <br />expedited study was conducted by the City's consultant, John <br />Carollo Engineers, and in March ~990, the Executive Summary, City <br />of Yuma, Main street Water Treatment Plant, UpgradefExpansion <br />Study (Carollo Study) was released. The Carollo Study determined <br />water use projections, assessed existing facilities, and <br />developed recommendations for increasing treatment capacity, <br />operational storage, and distribution capacity. <br /> <br />9 <br />