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reclamation Phases 2, 3, and 4. The final surface area of the goundwater lake will not be less <br />than 10 acres. <br />For the backfilled areas in Phases 2 and 3, the final Bound surface will contain slopes that are <br />generally shallow and flowing, but will be at a minimum 3H:1 V. The final elevation of these <br />backfilled areas will be determined by estimates of the local goundwater elevation. In general, <br />the backfill will be to a height approximately 2 feet above the average goundwater elevation. <br />Although the backfilled ground elevation may be below the high goundwater elevation in the <br />created wetland azeas, backfilled elevations will still be high enough to prevent permanently <br />exposed groundwater. <br />Portions of the goundwater lake that are backfilled in Phase 4, including the proposed <br />amendment area, will be backfilled for future industrial use. The backfill material for this area <br />will be placed and compacted to provide adequate stability for the anticipated future use. The <br />final elevation of the backfilled area will be at least 2 feet above the estimated maximum local <br />groundwater elevation. In addition, the final backfill elevation in this area will be as neaz to the <br />existing and surrounding Bound elevation as possible (depending on the availability of backfill <br />material). Grading will create relatively flat surfaces appropriate for industrial uses. Any slopes <br />remaining will be reclaimed to a minimum 3H:1 V Bade. As final slopes are gaded, topsoil will <br />be placed to provide a Bowing medium for the vegetation cover used to stabilize the azea prior <br />to the final land use. <br />As goundwater lake slopes and backfilled azeas are gaded, topsoil will be used to provide a <br />Bowing medium for vegetation. Depending on goundwater elevations, the fmal surface <br />elevation of the backfilled cell may be below the existing and surrounding Bound elevation. <br />Any slopes remaining will be reclaimed to a minimum 3H:1 V Bade. <br />Reclamation Measures/Materials Handlin¢ <br />The mining and backfilling will create the rough topography for the land uses. The backfilling <br />and gading will be done to provide stabilized pastureland and future industrial areas and to <br />minimize erosion. The backfill material will consist of native bedrock claystone, process fines, <br />overburden, other inert materials, and topsoil. The material will be generated from the Platte <br />Valley Operation, the adjacent Wattenberg Lakes site (Permit Number M2001008) and other <br />sites. There will not be known toxic or hazazdous materials in the backfill material. <br />Additionally, it is not likely that acid forming or toxic materials will be encountered during <br />mining. <br />The mining will not leave highwalls on the property. There will be no auger holes, adits, or <br />shafts left on the property. <br />Topsoilin <br />The top two to six inches of soil on the property and within the proposed amendment area is <br />generally classified as topsoil. This layer includes the root zone of gasses and crops, which will <br />be stripped and stockpiled separately. By using concurrent reclamation techniques, the topsoil is <br />Platte Malley Operation <br />DMG 172 Permit Amendment <br />Page 10 <br />L <br />