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<br />I <br />'. Evan D. Dildine, P.E., Technical Secretary <br />Water Qual ity Control Commission <br />May 22, 1979 <br /> <br />. <br /> <br />. <br /> <br />-7- <br /> <br />w <br />..... <br />ce $103,000 per mg of salt at Imperial Dam for agl^iculture, and $240,000 <br />~ <br /> <br />permg for industrial and municipal users. Using these figures as a <br /> <br />cost of removal and assuming that "no-salt return where practicable" <br /> <br />would be weighed against a sum of those two figures, the economics of <br /> <br />desalting for discharge back to the river may te an alternative that <br /> <br />could reasonably be considered. I would suspect that the economics of <br /> <br />using evaporation ponds for no-salt return would be more cost effective, <br /> <br />if land surface area was available. <br /> <br />In conclusion, I should note that I have not discussed ground water. <br /> <br />The desalting of ground water supplies has been a subject of research <br />and I am not aware of anything unique to Colorado in this area. <br /> <br />Also, I should point out that the Federal Clean Water Act, Section <br /> <br />208, provides for wastewater management plans to be developed and through <br /> <br />these locally developed plans, Colorado hopes to identify and explore <br /> <br />methods for non-point SQUI^ce salinity improvement in the tvlO major east <br /> <br />slope rivet' basins during the next few years. <br />