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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 Yarrow with Cicer milkvetch <br />Topsoil stockpiles will be drill seeded to the greatest extent possible. The remaining areas <br />will be broadcast seeded. <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 disturbed <br />• land areas shown on the Topsoil Handling Map (Map 28 and 28A). Future topsoil <br />redistribution will be done at an average depth of eight (8) inches based on the volumetric <br />analysis of available materials and areas as presented in Rule 2.05. Historical replacement <br />depths for reclaimed area units are tracked in the Annual Report. <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 />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. The method of topsoil replacement <br />most often used at Colowyo, which makes use of dozers, leaves the surface in a rough <br />condition which minimizes wind and water erosion. The use of a chisel plow following <br />topsoil replacement and the construction of contour furrows at the time of seeding or before <br />will also aid in erosion control. <br />• <br />4.06-3 Revision Date: 3/21/06 <br />Revision No.: TR-62 <br />