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<br />,p~ I <br />t~.~.;:t' <br />..~:-~~; <br /> <br />.... <br />l\:l <br />00 <br />tv <br /> <br />art New Page. for These Comm~nts <br /> <br />TECHNICAL CO~SIDERATIONS <br /> <br />3. General con~ents. <br /> <br />The entire Colorado River Water Quality Improvement Program is geared at <br />salt reduction at Imperial Dam. With the amount" of U.S. bucks involved, I would <br />like to have the actual ppm value reductions expected upstream of this point. In <br />other words what ppm value reduction can we anticipate in the Virgin River or Lake <br />Mead? Will this project change population growth locations? <br /> <br />4. Technical comments <br /> <br />There seems to be a discrepancy as to the location Df the brine evaporation <br />ponds near Las Vegas Wash. The United States Geological Survey Flood Prone Map shows <br />that approximately half these ponds are prone to a 100 year flood. According to this <br />report Corps of Engineers Flood Prone Maps show this area not in the path of a <br />100 year flood. Ther'e seems to bea contradiction here. <br /> <br />Also to protect the Brine Ponds from occasional flash floods caused by <br />heavy thunderstorm rainfall, a system of interception channels should be required <br />to collect and transport the floodflow around the ponds. <br /> <br />Provisions should be made to negate the erosion which will be caused when <br />the RO treated water re-enters Las Vegas Wash. During construction of the Las Vegas <br />Wash barrier, some effort to minimize turbidity downstream should be taken. <br />l~ontinved on reverSe side). <br /> <br />5. Other specific conments~ <br /> <br />. All sixteen desalinization projects are upstream of Lake Mead, Lake Mohave, <br />and Lake Havasu. Taking into consideration evaporation 'rates, percolation rates, and <br />detention time in these jakes, how long will it take to decrease the salt concentratio <br />154 ppm at Imperial Dam? <br /> <br />165 <br /> <br />