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The topsoil stockpiles will be seeded with the following perennial seed mixture to control • erosion. Western wheatgrass 4 Lbs PLS/Acre Thickspike wheatgrass' 4 Lbs PLS/Acre Yarrow** .15 Lbs PLS/Acre *option to replace Thickspike wheatgrass with Beardless bluebunch wheatgrass or Sheep fescue **option to replace Yarrow with Cicer millcvetch Topsoil stockpiles will be drill seeded to the greatest extent possible. The remaining areas will be broadcast seeded. Topsoil placement will be performed as outlined on page 2.05-4, Table 2.05-1 Topsoil Schedule For Mining Area. In those areas where topsoil is stripped and hauled directly back to contoured backfill, some of the established native species can be expected to occur in the revegetated area. Stockpiled topsoil will only be moved when required for redistribution on disturbed areas prior to seeding. An exception to this can occur to facilitate mining, construction of sediment control ditches, ponds, etc. Approval from the Division will occur prior to moving stockpiled topsoil for purposes other than seedbed preparation. 4.06.4 Redistribution • After the final grading is completed, the topsoil will be reapplied as shown on the Topsoil Handling Map (Map 28). The required topsoil depth is a uniform 18" throughout the mine. Colowyo will obtain approval for those areas where less than 18" of topsoil will be placed. The areas will be mapped and documented in the Annual Reclamation Report. Colowyo also has the option to submit a comprehensive Topsoil Redistribution Plan covering a given time period which varies the topsoil depths from 0-18". This Topsoil Plan must be approved by the Division before implementation and would be best served if planned in five year blocks. Where necessary, to prevent slippage surfaces and promote root penetration the spoil will be scarified by ripping and/or rough grading. This practice will assure a solid bond between the spoil and reapplied topsoil. To date, there is no evidence of topsoil slippage on reclaimed areas. A few small tension cracks resulting from settling of fill and topsoil have occurred in a few areas within a year or two after reclamation, but soon stabilized and begin to fill in. Historically, root penetration has not been a concern since there is a minimum 18" depth (12" in Section 11) of topsoil spread onto the spoil material. Colowyo will pay particular attention to those seeded areas obtaining approval for topsoil depths less than 12". Since all available topsoil existing on areas to be disturbed will be removed and reapplied, it will be fully capable of supporting growth necessary for the proposed post- mining land use. Compaction will be alleviated through chisel plowing. • 4.06-3 Revised 4/23/02 TR-52