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RULE 4 PERFORMANCE STANDARDS <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, contour furrows and terraces 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 filled, regraded or <br />otherwise stabilized. If needed, topsoil will be replaced and the areas will be reseeded. <br />To minimize disturbances to reclaimed areas by equipment, Colowyo will encourage stabilization through <br />means other than regrading. If some regrading becomes necessary for stabilization, a small rubber tired <br />farm tractor or track dozer will be allowed on the site to regrade the gullies. Generally, any rill and gully <br />repair will take place when the soil conditions are suitable. As a rule these stabilization techniques usually <br />take place at Colowyo in May or June when the topsoil has dried sufficiently to be worked. At Colowyo, <br />rill and gully repairs have not been a problem. If rills and gullies do occur, they are routinely located, <br />repaired, and, if necessary, reseeded in a timely manner every year. Colowyo will continue to implement <br />this successful policy of rill and gully repair. <br />Rule 4 Performance Standards 4.14-4 Revision Date: 6/5/09 <br />Revision No.: TR-80