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RULE 4 PERFORMANCE STANDARDS <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 at future date. <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 anticpated that additional topsoil will be required for final reclamation of the site. <br /> However,if necessary,Colowyo will apply an appropriate amount of topsoil to pond embankments <br /> that do not readily revegetate post construction. <br /> 4.06.3 Storage <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 /> 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 /> Topsoil marker signs will be placed on each stockpile to prevent inadvertent disturbance, <br /> unnecessary compaction or contamination. <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 /> 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 /> Rule 4 Performance Standards 4-22 Revision Date: 12/20/19 <br /> Revision No.: TR-135 <br />