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RULE 4 PERFORMANCE STANDARDS <br /> <br />Rule 4 Performance Standards 4-38 Revision Date: 6/24/24 <br /> Revision No.: MR-255 <br />Small depressions of a holding capacity slightly greater than one cubic yard of water may be used <br />to create a moist micro climate to aid in shrub establishment. See Section 2.05.4, Planting and <br />Seedings Methods for further information regarding these small depressions. Also, several stock <br />watering ponds will be constructed to compliment the postmining land use. Providing a supply of <br />water is an integral part of the grazing postmining land use. Colowyo will not be mining on any <br />slopes above 20° as shown on the Premining Topography Map (Map 18). <br /> <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 <br />that overall grades will not exceed lv:3h. The plan for backfilling and grading is shown graphically <br />on the Spoil Grading Map (Map 29). <br /> <br />4.14.3 Covering Coal and Acid and Toxic Forming Materials <br /> <br />Colowyo will not have any exposed coal seams remaining at the end of mining and reclamation. <br />Colowyo does not have any acid forming materials at the mine. For discussion on acid- and toxic- <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 /> <br />4.14.4 Thin Overburden <br /> <br />Colowyo does not have a thin overburden situation as explained in Section 4.14.1. <br /> <br />4.14.5 Thick Overburden <br /> <br />Colowyo does not have a thick overburden situation as explained in Section 4.14.1. <br /> <br />4.14.6 Regrading or Stabilizing Rills and Gullies <br /> <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 /> <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 />