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' • • XHIBIT D (Cont'd) <br /> <br />Soils vary in thickness from zero to one foot in a highly <br />irregular pattern across the affected land. Sand strata from <br />three recent floods are readily observed. The soils which are <br />present will be segregated carefully and stockpiled on the <br />' setback areas and, if necessary, a hold cover of western wheat- <br />grass will be used to minimize wind and water erosion as well <br />' as deterioration of the soil. <br />The sand and gravel will be mined by dragline in a wet <br />environment. No pumping to dewater or to lower the water level <br />will be necessary. Since there will be no dewatering, no NPDES <br />permit is required. Likewise, there will be no effect on wells <br />' in the area. The dragline will work back and forth in a row <br />pattern, from north to south in the width of the stage. The <br />row staging will start on the west side of the property and work <br />' to the east (see map Exhibit D-1 ). <br />h4ining equipment used may include, but is not limited to, <br />dragline, bulldozers, front-end loader, scraper, conveyor <br />system, dump truck and water truck. <br />In a dragline operation the perimeter can either be sloped <br />' at 3 to 1 during the mining operation or left nearly vertical <br />and shaped to a 3 to 1 slope during the reclamation phase. In <br />' most instances 3 to 1 slopes will be created during the mining <br />operation. However, some of the perimeter will be sloped with <br />' overburden, waste rock and silt. <br />1 <br /> <br />