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<br /> - s - <br />1 <br /> Table 3 presents net water loss for normal conditions <br />' as determined by deducting precipitation from total lake <br /> surface evaporation. The precipitation amounts are bused on <br />' U.S. Weather Bureau records at Sterling, Colorado. <br /> Evaporation from the 26.95 acre expansion of lakc~ <br />' surfaces at an annual rate of 2.41 feet will amount to a <br /> future increase in water use on the dredging area of ~i4.95 <br />' acre-feet per year. <br /> IMPACTS ON DREDGING ON THE <br /> SURFACE AND GROUND WATER SYSTEMS <br />1 <br /> The increase in water use on the dredging area i:~ the <br />' future will result in an annual depletion of the flow of the <br /> South Platte River by 64.95 acre-feet. <br />Gravel extraction in the dredging area will be <br />accomplished by dredging wet excavations. The water level <br />' in the excavations will not fluctuate far from existing <br />ground water levels in the area. Drawdown should not occur <br />outside the area. Consequently the dredging will have no <br />impact on wells or ditches on and near the area. Dredging <br />will not be conducted within 100 feet of the Lowline Ditch. <br />' Mine water circulation will be conducted in a closed <br /> system. Tail waters and fines will be returned to the <br />' excavations in the dreding area. There will be no discharge <br /> of water from the area to the South Platte River and <br />' consequently the proposed dredging operations will have no <br /> impact on the quality of water in the river. <br />' PLAN TO MITIGATE ADVERSE IMPACTS OF DREDGING <br /> Negotiations have been undertaken by Sterling Ready-Diix <br />' Concrete Co., Inc., to obtain a supply of water whicl-. will be <br /> sufficient to minimize the depletion of the streamflow in the <br />t South Platte River in the vicinity of the proposed dredging <br /> area if mitigation of streamflow depletion is necessziry. <br /> <br />' ~ Leonard Rice Consulting Water Engineers. Inc. 18 <br />