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RULE 4 PERFORMANCE STANDARDS <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 />Remediated areas will be monitored for one year following repair, and should the area appear to <br />be stabilized monitoring will be discontinued for that area. Areas that continue to exhibit unstable <br />conditions will be remediated again and monitored for another year. <br />Rule 4 Performance Standards 4-45 Revision Date: 5/25/18 <br />Revision No.: RN -07 <br />