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<br />I' <br /> <br />r... <br />c'? <br />~ <br />N <br />c' <br /> <br />~:-;.\ <br /> <br /> <br />':;, <br /> <br />Secondary sewage effluent Is piped from the AWT plant to the Harry Allen sIte <br />through a pipeline approxImately 25 miles In length. Water demand for average <br />and peak load conditions ranges from approxImately 9,000 (14,500 acre- <br />feet/year) to 12,000 gpm (19,400 acre-feet/year), dependIng on the water <br />treatment process option. <br /> <br />;, <br /> <br />LOWER VIRGIN RIVER UNIT <br /> <br />:f <br /> <br />The Lower Virgin River Unit Is a saline water source under study by the Bureau <br />of Reclamation as part of the Colorado River Water Quality Improvement <br />Program. This unit area Is located along the VirgIn River between Littlefield <br />Springs, Arizona and Lake Mead In Nevada. The unit water supply plan Includes <br />groundwater from well fields drilled by the Bureau of Reclamation In the river <br />flood plain, plus surface water from the Lower Virgin River which contributes <br />to recharge of the well field. <br /> <br />Water quality data for the Lower Virgin River UnIt for the period of 1979 <br />through 1985 were supplied by the Bureau of Reclamation. Water quality for <br />the Lower Virgin River Unit was characterized from these data assumIng 60% <br />ground water and 40% surface water. These results are shown In Table 3-2. <br />SupportIng analytIcal data are shown In AppendIx B-2. <br /> <br /><i <br /> <br />Lower Virgin River water would be pumped to the plant site by a pipeline or a <br />pipeline and tunnel system. Three pipeline routes and one pipeline and tunnel <br />route are under study by the Bureau of Reclamation. The distances for these <br />alternatives vary from approxImately 42 to 50 miles. <br /> <br />Plant demand for the LVR water supply also varies from approximately 9,000 gpm <br />to 12,000 gpm, dependIng on the selected water treatment process option. <br /> <br />" <br />" <br /> <br />, <br />" <br /> <br />.~, <br />" <br />~ <br /> <br /> TABLE 3-2 <br /> :~, <br /> LOWER VIRGIN RIVER RAW WATER QUALITY ',<, <br /> (mg/I as Ion) ::i <br /> " <br /> ~: <br />Ion GW GW SW SW Blend Blend , <br /> ~.l.' <br /> Avg HI Avg Avg HI Avg Avg HI Avg ~:~ <br /> .>: <br /> .. <br />Na 340 516 278 366 316 457 " <br /> p~' <br />Ca 312 437 255 318 289 389 , <br />Mg 132 184 90 112 115 155 <br />HC03 235 307 263 333 246 317 <br />CI 433 664 345 431 398 571 .. <br />S04 1208 1711 872 1124 1074 1476 "', <br />t-ll3 0.5 1 <br />P04 0.5 1 <br />SI02 26 33 19 21 23 28 3 <br /> .. <br />TOS 2686 3852 2122 2705 2462 3395 <br /> .'.:-. <br />GW: Groundwater " <br />SW: Surface Water ".:': <br /> 3-2 <br /> <br /> <br />" <br />(i <br />;~. <br />f.~t <br />