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• The topsoil stockpiles will be seeded with the following perennial seed mixture to control <br />erosion. <br />Western wheatgrass - 4 Lbs PLS/Acre <br />Thickspike wheatgrass* - 4 Lbs PLS/Acre <br />Yarrow** - .15 Lbs PLS/Acre <br />*option to replace Thickspike wheatgrass with Beardless bluebunch wheatgrass or Sheep fescue <br />* *option to replace Yarzow with Cicer milkvetch <br />Topsoil stockpiles will be drill seeded to the greatest extent possible. The remaining areas <br />will be broadcast seeded. Topsoil placement will be performed as outlined on page 2.05-4, <br />Table 2.05-I Topsoil Schedule for Mining Area. <br />In those areas where topsoil is stripped and hauled directly back to contoured backfill, some <br />of the established native species can be expected to occur in the revegetated area. <br />Stockpiled topsoil will not be moved when required for redistribution on disturbed areas prior <br />to seeding. An exception to this can occur to facilitate mining, construction of sediment <br />control ditches, ponds, etc. Approval from the Division will occur prior to moving stockpiled <br />topsoil for purposes other than seedbed preparation. <br />4.06.4 Redistribution <br />• After the final grading is completed, the topsoil will be reapplied as shown on the Topsoil <br />Handling Map (Map 28). The required topsoil depth is a uniform 18" throughout the mine. <br />Colowyo will obtain approval for those areas where less than 18" of topsoil will be placed. <br />The areas will be mapped and documented in the Annual Reclamation Report. Colowyo also <br />has the option to submit a comprehensive Topsoil Redistribution Plan covering a given time <br />period which varies the topsoil depths from 0-18". This Topsoil Plan must be approved by <br />the Division before implementation and would be best served if planned in five year blocks. <br />Where necessary, to prevent slippage surfaces and promote root penetration the spoil will be <br />scarified by ripping and/or rough grading. This practice will assure a solid bond between the <br />spoil and reapplied topsoil. To date, there is no evidence of topsoil slippage on reclaimed <br />areas. A few small tension cracks resulting from settling of fill and topsoil have occurred in a <br />few areas within a year or two after reclamation, but soon stabilize and begin to fill in. <br />Historically, root penetration has not been a concern since there is a minimum 18" depth (12" <br />in Section 11) of topsoil spread onto the spoil material. Colowyo will pay particular attention <br />to those seeded areas obtaining approval for topsoil depths less than 12". <br />Since all available topsoil existing on areas to be disturbed will be removed and reapplied, it <br />will be fully capable of supporting growth necessary for the proposed post-mining land use. <br />Compaction will be alleviated through chisel plowing. <br />r1 <br />LJ <br />4.06-3 Revision Date: 6/18/02 <br />Revision No.: MR-57 <br />