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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />. <br /> <br />Ground Water (Alluvial Wells) <br /> <br />Alluvial wells, which tap Colorado River water through the alluvium, is <br /> <br />possible, but data obtained during this study indicated low permeabilities. <br />It is insufficient, however, to conclude that diversion through the river <br /> <br />alluvium is not feasible. The river alluvium hydraulic characteristics can <br /> <br />vary from one location to another. Field investigation beyond the scope of <br /> <br />this report is necessary to determine if a suitable location exists. In <br /> <br />many areas near Fruita. these alluvium may contain water of poor quality. <br /> <br />Colorado River <br />There is ample quantity of Colorado River water but during the major part of <br />the year, the water is of questionable quality for a water supply. U.S.G.S. <br />Water Quality data from the gaging station at the Colorado Utah state line <br />indicates that the water is very hard, high in dissolved solids, contains <br />selinuim, is high in total organic carbons and is high in manganese. Treat- <br />ment can reduce the hardness, manganese and total organic carbons but the water <br />will still be high in dissolved solids, sulfates and contain selinium. To <br />reduce total dissolved solids, selenium and sulfates by treatment, sophisticated <br />process such as electrodialysis or reverse osmosis must be used. The process <br />is very expensive and troublesome to operate and are not in general use in <br />this country for plants larger than 50 to 100 gallons per minute. <br /> <br />Water quality data should be obtained from the Colorado River at Fruita to <br />verify the available data used in this report. To improve the quality of <br />the Colorado River water, consideration should be given to the continued <br />use of the Pinion Mesa water and blend them with the Colorado River waters. <br />The degree of blending would be variable and depend on the quality of the <br />Colorado River water, which will be at its poorest quality during low flow <br />periods when City demands will be the highest. <br /> <br />CONCLUSION AND RECOMMENDATIONS <br />1. The existing 8-inch treated water transmission main is of inadequate size <br />and should be replaced with a 14-inch pipeline. <br /> <br />-4- <br />