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<br /> <br />' immediatel <br />tion of each minin <br />u <br />on the com <br />l <br />sta <br />e (see ma <br /> y <br />g <br />p <br />p <br />g <br />p <br />e <br />' Exhibit D-1). Except for Stage Z, the pit is operated year- <br /> round by Valco as a specification aggregate supply for its <br />' off-site concrete batch plant. <br /> 9s operations begin on each mining stage, the soils and <br />' overburden are removed, segregated and stored for future use <br />' in seed bed preparation and in backfilling and grading. <br />5 <br /> Overburden thickness varies from 2 to 7 feet in Areas 1 and 2 X: <br />t and from 6 to 16 feet in Areas 3 and 4. A large amount of <br /> non-soil overburden has been used to create the separation <br />' berm between Stage O and Stage 1. Most of this overburden <br /> will be used to bring bank slopes to the 3 to 1 requirement. <br />' <br /> Overburden will also be used to create peninsulas and other <br /> shoreline irregularities. <br /> Soils vary in thickness across the affected land from <br />' zero to six feet in a highly irregular pattern. The average <br /> thickness is less than one foot. Much of the material <br />' <br /> classified as sandy loam by the SCS is classified as product <br />' sand and gravel by Valco's operations staff. The segregated <br />soils are carefully stockpiled and, if necessary, a hold cover <br />1 of western wheatgrass is used to minimize wind and water <br />erosion as well as deterioration of the soil. <br />Each mining stage will be dewatered as mining commences. <br />' Dewatering is carried out under Colorado Department of Health <br />NPDES Permit No. CO-0031054. Rater is discharged to the <br />' Arkansas River. The water discharged to the river is of <br /> <br />J <br />