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I <br /> The alluvium serves as an aquifer and provides water to wells in <br /> the area. Typical well yields are 5-15 gallons per minute. The <br /> wells closest to the new stages are located in the NE 1/4, NW 1/4 <br /> of Section 16 about 1300 feet west of Stage 4 and 530 feet south <br /> of Stage 6 . In this area, there are two wells that serve a trailer <br /> park and 3 wells that serve individual residences. These wells are <br /> iapproximately located on Plates 1 and 2 . <br /> 1 EXPECTED IMPACTS <br /> ! Based upon hydrologic properties of the sand and gravel we <br /> calculate for Stage 4 that at distances greater than 333 to 566 <br /> feet beyond a line labeled "no change" , as shown on Plate 1 , there <br /> will be no change in the depth to the water table. Similarly, for <br /> Stage 6 , there will be no change beyond 167 to 333 feet as shown <br /> on Plate 2 . Beyond these lines there will be no increase in depth <br /> to water, no change in well yields, no change in the direction of <br /> ground water movement and no change in the rate of ground water <br /> movement. Because the closest wells are about 760 feet beyond the <br /> "no change" line for Stage 4 and 380 feet for Stage 6 there will <br /> be no impact to either quantity or quality in any wells due to <br /> mining. Between the dewatering trench and the "no change" line the <br /> Idepth to water will increase as shown on Plates 1 and 2 . <br /> The normal year to year and seasonal changes in precipitation and <br /> irrigation patterns cause the depth to water to regularly increase <br /> and decrease. Therefore, when dewatering begins, it will be <br /> l important to separate the changes due to precipitation and <br /> irrigation fluctuations from dewatering changes . This is best done <br /> I_ by measuring the depth to water in monitoring wells prior to and <br /> during mining. <br /> I <br /> I_ <br /> 2 <br /> 00 Leonard Rice Consulting Water Engineers.Inc. <br />