Laserfiche WebLink
RULE 4 PERFORMANCE STANDARDS <br />4.06.3 Storage <br />The estimated quantity of topsoil in stockpile is found in Table 2.05-1, Topsoil Balance As Of October, <br />2005. Topsoil stockpiles exist for support facilities and the mining area. All of the existing or proposed <br />stockpiles result where immediate redistribution will not be practical, either because redistribution areas <br />are not available at the time of topsoil removal, or because more topsoil is being removed than what will <br />be necessary for immediate redistribution. Any additional stockpiles may be placed on flat spoil backfill <br />areas or stable portions of the permit area where stockpiles will be protected from external effects of both <br />wind and water erosion. Stockpiles have also been placed to avoid disturbances other than those <br />incidental to their deposition and removal. <br />Colowyo utilizes a variety of methods to protect topsoil stockpiles from erosion. Colowyo will utilize one <br />or more of the following techniques to protect topsoil from erosion. Small catchment berms and ditches <br />may be employed to route surface runoff away from stockpile areas. Small sumps or dozer basins may be <br />employed to collect runoff. Adjacent disturbance areas may be ripped or otherwise roughened to reduce <br />runoff. Topsoil stockpiles may be strategically placed and constructed to allow runoff to be routed around <br />stockpile locations rather than pond against a stockpile. <br />Topsoil marker signs will be placed on each stockpile to prevent inadvertent disturbance, unnecessary <br />compaction or contamination. <br />At the locations where topsoil piles are located on undisturbed land, in place topsoil and vegetation will <br />not be removed prior to stockpiling topsoil. The topsoil stockpiles will be seeded with the following <br />perennial seed mixture to control 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 will be <br />broadcast seeded. <br />In those areas where topsoil is stripped and hauled directly back to contoured backfill, some of the <br />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 to seeding. <br />An exception to this can occur to facilitate mining, construction of sediment control ditches, ponds, etc. <br />Approval from the Division will occur prior to moving stockpiled topsoil for purposes other than seedbed <br />preparation. <br />4.06.4 Redistribution <br />After the final grading is completed, the topsoil will be reapplied as shown on the disturbed land areas <br />shown on the Topsoil Handling Map (Map 28 and 28A). Future topsoil redistribution will be done at an <br />average depth of eight (8) inches based on the volumetric analysis of available materials and areas as <br />presented in Rule 2.05. Historical replacement depths for reclaimed area units are tracked in the Annual <br />Report. <br />Rule 4 Performance Standards 4.06-2 Revision Date: 6/23/08 <br />Revision No.: MR-91