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RULE 4 PERFORMANCE STANDARDS <br /> forming materials, refer to Section 2.04.6. For disposal of noncoal wastes or materials <br /> constituting a fire hazard, refer to Section 4.11.4. <br /> 4.14.4 Thin Overburden <br /> Colowyo does not have a thin overburden situation as explained in Section 4.14.1. <br /> 4.14.5 Thick Overburden <br /> Colowyo does not have a thick overburden situation as explained in Section 4.14.1. <br /> 4.14.6 Regrading or Stabilizing Rills and Gullies <br /> The implementation of soil stabilizing practices outlined under Section 4.15.4 will lessen the <br /> possibility that erosion can become a serious problem. Colowyo plans to continue using surface <br /> manipulation techniques such as chisel plowing to reduce compaction and contour ditches/furrows <br /> to minimize overland flow over any long,uninterrupted slope. These methods have been shown to <br /> be highly successful in controlling erosion at Colowyo. <br /> Rills and gullies which form in areas that have been regraded and topsoiled and which either (1) <br /> disrupt the approved postmining land use or the reestablishment of the vegetative covers or (2) <br /> cause or contribute to a violation of water quality standards for receiving streams will be identified <br /> during the spring of each year. Regraded and topsoiled areas will be visually inspected and rills <br /> and gullies identify. Colowyo will submit a report which provides a general description of the <br /> identified rills and gullies, activities undertaken to remediate these areas, time frames of repair, a <br /> description of any re-topsoiling and re-seeding activities, and a map idenfying the problem areas <br /> on a scale of 1-inch equals 500-feet. This report will be submitted annually no later than June 15 <br /> of each year. <br /> As rill or gully features are identified for remediation Colowyo will utilize appropriate manpower <br /> and equipment depending on the ground conditions and the extent of the erosion. This shall <br /> include but is not limited to small track dozers, blades, and small rubber tired farm tractors. <br /> Repairs will take place within three months of the visual inpsecitons being completed. If ground <br /> conditions are such where soil conditions are not favorable, repair will commence as soon as <br /> ground conditions allow equipment to access the area without creating additional disturbance. As <br /> soon as any repair takes place the area shall be seeded with the appropriate seed mixture. <br /> Generally, remediation work will commence when soil conditions are suitable each year. <br /> During repair of any rill or gully Colowyo will first identify and salvage any topsoil that may have <br /> been repositioned by erosion. This topsoil will be salvaged, stockpile in a location that is easily <br /> accessible by equipment making repairs, and re-applied after the repair of a rill or gully is <br /> complete. Once repairs are complete,topsoil will be re-applied to the disturbed area and re-seeded <br /> to the appropriate seed mixture. Colowyo is committed to preserving the topsoil resources and <br /> utilizing it appropriately through approved reclamation practices. <br /> Rule 4 Performance Standards 4-37 Revision Date: 12/20/19 <br /> Revision No.: TR-135 <br />