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2.05.6 Mitigation of the Impacts of Mining Operations <br />The sedimentation control plan is presented in Volume I Exhibit 9, and in <br />Volume II, Maps 13. <br />Sediment ponds will improve the quality of the surface water flowing <br />through and out of the proposed permit area and adjacent area because <br />sediment loads will be reduced. As required by USFWS conservation <br />measures; the sediment ponds will be lined to prevent seepage of water <br />and dissolved constituents and mobilization of contaminants in pond <br />substrates. Sediment and water removed from the ponds will be disposed <br />of at an approved disposal facility. <br />Run off from the facilities will flow to the southwest and intercept Reed <br />Wash. A minor amount of run off from the rail spur will flow into the Loma <br />Drain. <br />(b)(ii) A plan for treatment and for surface and ground water drainage. <br />Surface run -off from the facilities area should not require treatment, other <br />than detention time provided by the sedimentation control pond(s) or <br />treatment with alternative sedimentation control. The sediment ponds will <br />be lined to prevent seepage of water and dissolved constituents and <br />mobilization of contaminants in pond substrates. Sediment and water <br />removed from the ponds will be disposed of at an approved disposal <br />facility. <br />(b)(iii) Probable Hydrologic Consequences <br />Alluvial Groundwater <br />Most precipitation is lost to evaporation from the soil or is transpired by <br />vegetation before it can percolate to the water table and recharge the <br />aquifer. Most precipitation recharge likely occurs during periods of <br />snowmelt or prolonged rainfall when water is available for percolation and <br />evapotranspiration rates are small. In clayey soils, percolation is slow, <br />and most soil water is held at shallow depth, where it can be lost to <br />evapotranspiration. Intense precipitation produces surface runoff and low <br />percolation. According to the USGS, `evapotranspiration is the sum of <br />Permit Application 2.05 -56 01/12 <br />