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RULE 4 PERFORMANCE STANDARDS <br /> <br />Rule 4 Performance Standards 4-22 Revision Date: 4/9/25 <br /> Revision No.: MR-261 <br />Topsoil and vegetation matter is typically windrowed, sloped and seeded during initial sediment <br />pond construction and saved for reapplication when the pond is reclaimed at a future date. <br /> <br />The pond embankments are constructed utilizing in-place materials directly below the upper <br />topsoil zone. This colluvial material is “topsoil” in nature and will be utilized at a future date for <br />pond reclamation. Since the nature of the embankment material functions readily as a topsoil <br />material, it is not anticipated that additional topsoil will be required for final reclamation of the <br />site. However, if necessary, Colowyo will apply an appropriate amount of topsoil to pond <br />embankments that do not readily revegetate post construction. <br /> <br />4.06.3 Storage <br /> <br />The estimated quantity of topsoil in stockpile is found in Table 2.05-1, Topsoil Balance As Of <br />October, 2005, and in Section 11 of the Annual Reclamation Report. Topsoil stockpiles exist for <br />support facilities and the mining area. All of the existing or proposed stockpiles result where <br />immediate redistribution will not be practical, either because redistribution areas are not available <br />at the time of topsoil removal, or because more topsoil is being removed than what will be <br />necessary for immediate redistribution. Any additional stockpiles may be placed on flat spoil <br />backfill areas or stable portions of the permit area where stockpiles will be protected from external <br />effects of both wind and water erosion. Stockpiles have also been placed to avoid disturbances <br />other than those incidental to their deposition and removal. <br /> <br />Colowyo utilizes a variety of methods to protect topsoil stockpiles from erosion. Colowyo will <br />utilize one or more of the following techniques to protect topsoil from erosion. Small catchment <br />berms and ditches may be employed to route surface runoff away from stockpile areas. Small <br />sumps or dozer basins may be employed to collect runoff. Adjacent disturbance areas may be <br />ripped or otherwise roughened to reduce runoff. Topsoil stockpiles may be strategically placed <br />and constructed to allow runoff to be routed around stockpile locations rather than pond against a <br />stockpile. <br /> <br />Topsoil marker signs will be placed on each stockpile to prevent inadvertent disturbance, <br />unnecessary compaction or contamination. <br /> <br />At the locations where topsoil piles are located on undisturbed land, in place topsoil and vegetation <br />will not be removed prior to stockpiling topsoil. The topsoil stockpiles will be seeded with the <br />following perennial seed mixture to control erosion. <br /> <br />Western wheatgrass - 4 Lbs PLS/Acre <br />Thickspike wheatgrass* - 4 Lbs PLS/Acre <br />Yarrow** - .15 Lbs PLS/Acre <br /> <br />*option to replace Thickspike wheatgrass with Beardless bluebunch wheatgrass or Sheep fescue <br />**option to replace Yarrow with Cicer milkvetch <br /> <br />Topsoil stockpiles will be drill seeded to the greatest extent possible. The remaining areas will be <br />broadcast seeded.