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<br />OC."--.; <br />L.-,~JJ <br /> <br />storage would be partially offset by the head recovered during <br />delivery. Each tank would store about 1.65 Mgals and be about <br />120 feet in diameter and 19 feet high. The number of tanks <br />required would vary depending on the storage volume required. <br />Interconnecting piping and valves would provide flexibility in <br />allowing tanks to be isolated for inspection and cleaning. <br /> <br />Solar heat gain with above ground steel tanks is significant in <br />the hot summer months and may result in warmer water being <br />delivered. Foundation treatment would still be required for the <br />above ground tanks. ' <br /> <br />-\ <br /> <br />An above ground reinforced concrete storage tank should also be <br />considered if the city and Reclamation proceed with specification <br />designs. The cost may be less than the steel tanks and the solar <br />heat gain would be reduced. <br /> <br />A cost comparison of 1990 construction costs of the partially <br />underground concrete clearwell, and the glass-lined steel tanks <br />is shown below in Table 4. <br /> <br /> TABLE 4 <br /> PRODUCT CLEARWELL OPTIONS <br /> COMPARISON OF CONSTRUCTION COSTS <br /> ($1,000) ) <br /> ~ <br />Max. Day C1earwe11 Partia1ly Glass-Lined <br />capacity storage underground Stee1 <br />Mga1s/d Mgals Concrete Tanks <br /> Tank <br /> 20 5 5,100 2,700 <br /> 30 7.5 6,200 3,400 <br /> 40 10.0 8,000 4,900 <br /> 70 17.5 12,500 7,700 <br /> <br />Based on the above tab1e the above ground glass-lined tanks would <br />be less expensive. Other above ground designs may further reduce <br />costs and should be investigated. <br /> <br />(*** DESALTING PLANT ALTERNATIVES WILL ASSUME GLASS-LINED STEEL <br />TANKS ***) <br /> <br />21 <br />