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Topsoil and Subsoil Redistribution Plan <br />• Reclamation of disturbed areas occurred during two periods: the pit was reclaimed during <br />July through November 1989; and the sediment control system was reclaimed during January <br />and February 1992. In all, approximately 260,000 yds' of overburden and 100,000 yds' of <br />subsoil/topsoil were moved during these two periods. Timing and methods for drill hole <br />reclamation are provided in Exhibit 9. No additional reclamation activities are proposed for <br />this site. <br />All disturbed areas of the mine site have been reclaimed by the following procedures. Prior <br />to the reapplication of the topsoil, subsoil and low SAR overburden, the spoil was graded <br />along the contour to minimize erosion, assure stability and minimize slippage. First, the low <br />SAR overburden was reapplied onto the regraded spoil. Subsoil was than reapplied in a <br />thickness approximately equal to that originally removed (averaging 33 inches). After the <br />subsoi] was reapplied, the topsoil was redistributed to a depth of 15 inches. The reconstruct- <br />ed soil profile was finally graded to assure a uniform and stable thickness that is capable of <br />supporting the proposed postmining land uses. <br />Following reapplication and the final grading of these materials, the topsoil was scarified <br />with a chisel plow to alleviate compaction caused by machinery. This treatment will promote <br />root penetration of the planted vegetation. <br />In order to assure that the reapplied topsoil will support the proposed postmining land use <br />• of rangeland, a soil sampling program was implemented. Specific parameters which were <br />sampled are topsoil depth; nitrate-nitrogen reported as parts per million (ppm); organic <br />matter to determine the nitrate producing potential; phosphorus as parts per million (ppm); <br />and potassium as parts per million (ppm). Fertilizer was applied at he rates recommended. <br />Revegetation Plan <br />Following the topsoiling of an area, a straw mulch at the rate of 4,000 pound per acre was <br />applied to the surface. As soon as possble after the topsoil has been applied and the mulch <br />spread, the actual seeding of the area was completed. The proposed rangeland seed <br />mixture, as shown in Table 16, Proposed Seed Mixture, contains the diversity essential for <br />ecological state stability. Seeding of reclaimed areas were completed during November 1989 <br />and February 1992. <br />Imgation <br />No irrigation is planned for areas which were seeded or mulched. If climatic conditions such <br />as severe drought dictate that irrigation must be used at some future date, a detailed <br />irrigation plan will be submitted to the Colorado mined Land Reclamation Board to <br />approval prior to the implementation of any irrigation program. <br /> <br />2.0$-2 Revised August 4 1993 <br />