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RULE 4 PERFORMANCE STANDARDS <br />Final grading before topsoil placement will be conducted in a manner that minimizes erosion and <br />provides a surface for the topsoil that minimizes slippage. Final grading will be accomplished so that <br />overall grades will not exceed lv:3h. The plan for backfilling and grading is shown graphically on the <br />Spoil Grading Map (Map 29). <br />4.14.3 Covering Coal and Acid and Toxic Forming Materials <br />Colowyo will not have any exposed coal seams remaining at the end of mining and reclamation. Colowyo <br />does not have any acid forming materials at the mine. For discussion on acid- and toxic -forming <br />materials, refer to Section 2.04.6. For disposal of noncoal wastes or materials constituting a fire hazard, <br />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 possibility <br />that erosion can become a serious problem. Colowyo plans to continue using surface manipulation <br />techniques such as chisel plowing to reduce compaction and contour ditches/furrows to minimize <br />overland flow over any long, uninterrupted slope. These methods have been shown to be highly <br />successful in controlling erosion at Colowyo. <br />Rills and gullies which form in areas that have been regraded and topsoiled and which either (1) disrupt <br />the approved postmining land use or the reestablishment of the vegetative covers or (2) cause or <br />contribute to a violation of water quality standards for receiving streams will be identified during the <br />spring of each year. Regraded and topsoiled areas will be visually inspected and rills and gullies identify. <br />Colowyo will submit a report which provides a general description of the identified rills and gullies, <br />activities undertaken to remediate these areas, time frames of repair, a description of any re-topsoiling and <br />re -seeding activities, and a map idenfying the problem areas on a scale of 1 -inch equals 500 -feet. This <br />report will be submitted annually no later than June 15 of each year. <br />As rill or gully features are identified for remediation Colowyo will utilize appropriate manpower and <br />equipment depending on the ground conditions and the extent of the erosion. This shall include but is not <br />limited to small track dozers, blades, and small rubber tired farm tractors. Repairs will take place within <br />three months of the visual inpsecitons being completed. If ground conditions are such where soil <br />conditions are not favorable, repair will commence as soon as ground conditions allow equipment to <br />access the area without creating additional disturbance. As soon as any repair takes place the area shall <br />be seeded with the appropriate seed mixture. Generally, remediation work will commence when soil <br />conditions are suitable each year. <br />During repair of any rill or gully Colowyo will first identify and salvage any topsoil that may have been <br />repositioned by erosion. This topsoil will be salvaged, stockpile in a location that is easily accessible by <br />equipment making repairs, and re-applied after the repair of a rill or gully is complete. Once repairs are <br />Rule 4 Performance Standards 4.14-4 Revision Date: 6/15/15 <br />Revision No.: TR -105 <br />