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<br />. <br /> <br />VI. CONCLUSIONS <br /> <br />. <br /> <br />1. It is technically feasible to remove most of the salt dis- <br />charge of La Verkin Springs from the Virgin River by capturing the <br />springflow, desalting it, and returning the desalted water to the <br />river. A physical plan has been developed using the current state of <br />the art for design and construction of membrane desalting plants and <br />solar evaporation brine disposal facilities. <br />2. The unit cost effectiveness of the plan is about $1,060,000 <br />per mg/L of reduction in salinity of the Colorado River at Imperial <br />Dam, based on October 1978 construction costs. This level of cost <br />effectiveness is not considered acceptable for recommendation of the <br />plan for authorization at this time. <br />3. The alternatives which may have the potential to reduce the <br />project cost significantly are, (a) higher recovery desalting and <br />pretreatment processes, (b) evaporation enhancement, and, (c) deep <br />well injection of desalting reject brine. <br />4. Each of the above alternatives is being studied to determine <br />its potential for cost reduction, and how it can be incorporated into <br />the project plan. If a feasible plan is found, an Environmental <br />Impact Statement and Feasibility Report would be prepared. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />002533 <br /> <br />24 <br />