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<br />~ <br />~i <br />~ <br /> <br />C" <br />C order of $500,000 - $600,000 per year. Damages to users in Arizona, <br />Nevada, and in the Republic of Mexico would also be substantial. <br />Need for Salinity Control Projects <br />The Board's report listed a number of salinity control projects <br />that had been investigated on a reconnaissance level basis by the <br />Federal Water Quality Administration and the U. S. Bureau of Reclama- <br />tion. Collectively, these projects would result in the removal of <br />about 2.8 million tons of salt per year when fully implemented, which <br />is equal to about 25 percent of the 11.4 million tons of salt esti- <br />mated to reach Hoover Dam by the year 2000 and annually thereafter. <br /> <br />However, even after constructing these projects, it is estimated that <br /> <br />salinity at Imperial Dam would increase by 160 ppm by the year 2000 <br />over present day levels. It is therefore important that, in order <br />to halt the trend of increasing salinity in the river, every project <br />that would otherwise increase the salinity must either be modified <br />to minimize such salinity increase or be balanced by other projects <br />that decrease salinity. Such a policy is essential to the Lower Basin <br />states of California, Arizona, and Nevada, and should be firmly fol- <br />lowed by them in order to obtain support from the Federal Government <br />and the Upper Basin states for projects to control the river's <br />salinity. <br /> <br />Comparison of Cost of Preventing Salt Return <br />to Lake Powell With Costs of Other Salinity Control Projects <br /> <br />Pages 5-8 and 5-9 of the Bechtel report give the minimum and <br /> <br />maximum salinity range at the intake and indicate that the average <br /> <br /> <br />dissolved solids concentrations are considerably closer to the maxi- <br /> <br />mum values, Based on these mU1:imum va:ues, the annual quantity of <br /> <br />~ <br />-~- <br />