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<br />. <br /> <br />. <br /> <br />l'0 <br />OJ <br />~ delayed until further study \~as comoJ.eted. A reevaluation of <br /> <br />water and salt movem,:nt mechanisms has resulted in <br /> <br />consir1eration of ne~ conce9ts for salinity control. <br /> <br />A continuing ground water monitoring program in the <br /> <br />Lower Las Vegas Valley, augmented by the addition of 50 new <br />wells in the Pittman area, is to be used to verify expected' <br />changes in ground water levels andqu~lity before and after <br /> <br />the abandonment of unlined waste water ditches in the area. <br /> <br />Re-evaluation of the control schemes for the Wash have shown <br /> <br />that bYl?assing treated waste water and cooling water around <br /> <br />the saline portions of the Wash offers a viable cost <br /> <br />effective means of control. <br /> <br />In order to verify the proposed salinity control scheme, <br /> <br />waste water from the qenderson area is to be diverted to a <br /> <br />Pittman bypass pipeline to be constructed by October 1983. <br /> <br />The curtailment of seepage from this unlined ditch is <br /> <br />expected to reduce saline ground water inflow to Las Vegas <br /> <br />Wash resulting in a possible salt reduction of 20,000 tons <br /> <br />perye'.lr. <br /> <br />In order to assess the results of the Pittman <br /> <br />verification program, the monitoring of the resulting ground <br /> <br />water changes should be continued for one year. <br /> <br />The Council recommends proceeding with the Pittman <br /> <br />bypass channel verification program in Fiscal Year 1983. The <br /> <br />proposed waste water bypass system in the wash has the <br /> <br />potential for reducing tl1e current salt load by an addi tional <br />51,000 tons for a total of 71,000 tons per year. The cost <br /> <br />-5- <br /> <br />., <br /> <br />;~,>;~ <br />