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RULE 4 PERFORMANCE STANDARDS <br />on the Map 19B. Post - mining surface drainage channels will be located to minimize erosion and to minimize <br />slippage. <br />4.14.2 General Grading Requirements <br />The final graded slopes at the mining operation will not exceed the approximate original pre- mining slope <br />grade as shown on Map 19B. Colowyo will retain all overburden and spoil material on solid portions of <br />existing or new benches. The final highwall at the operation will be eliminated by backfilling overburden into <br />the final pit area. <br />Small depressions of a holding capacity slightly greater than one cubic yard of water may be used to create a <br />moist micro climate to aid in shrub establishment. See Section 2.05.4, Planting and Seeding Methods for <br />further information regarding these small depressions. Also, several stock watering ponds will be constructed <br />to compliment the post- mining land use. Providing a supply of water is an integral part of the grazing post - <br />mining land use. Colowyo will not be mining on any slopes above 20° as shown on Map 18A. <br />Final grading before topsoil placement will be conducted in a manner that minimizes erosion and provides a <br />surface for the topsoil that minimizes slippage. Final grading will be accomplished so that overall grades will <br />not exceed lv:3h. The plan for backfilling and grading is shown graphically on the Map 29A. <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 materials, <br />refer to Section 2.04.6. For disposal of non -coal wastes or materials constituting a fire hazard, refer to Section <br />4.11.4. <br />4.14.4 Thin Overburden <br />Colowyo does not have a thin overburden situation as defined in Section 4.14.4 of the regulations. <br />4.14.5 Thick Overburden <br />Colowyo does not have a thick overburden situation as defined in Section 4.14.5 of the regulations. <br />4.14.6 Re- grading or Stabilizing Rills and Gullies <br />This section will remain unchanged from the previously- approved permit document. <br />4.15 REVEGETATION REQUIREMENTS <br />4.15.1 — 4.15.7 Revegetation Requirements, Various <br />These sections are addressed in the original permit and are currently under discussion with DRMS and <br />CDOW. <br />4.15.8 Revegetation Success Criteria <br />The vegetation monitoring methods and statistical analyses for the demonstration of revegetation success, <br />vegetation cover, herbaceous production, and woody plant density are described in the previously approved <br />South Taylor /Lower Wilson — Rule 4, Page 17 Revision Date: 10/31/13 <br />Revision No.: MR -129 <br />