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RULE 4 PERFORMANCE STANDARDS <br />furrows will be constructed according to the requirements outlined in Section 2.06.2. Where applicable, <br />Colowyo will retain all overburden and spoil on the solid portion of existing benches. The final graded <br />slopes will not exceed the approximate original pre -mining slope grade as shown on the Map 19C — Post <br />Mining Topography. Table 2.05.6-5 presents a mine -wide volumetric calculation in support of the Post <br />Mining Topography. Post -mining surface drainage channels will be located to minimize erosion and to <br />minimize 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 19C. Colowyo will retain all overburden and spoil material on solid portions of <br />existing or new benches. The final bench at the terminus of the operation will be eliminated by <br />backfilling overburden into the final pit area. <br />Small depressions of a holding capacity slightly greater than one cubic yard of water may be used to <br />create a moist micro climate to aid in shrub establishment. See Section 2.05.4, Planting and Seeding <br />Methods for further information regarding these small depressions. <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 />Map 29B. <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. <br />Colowyo 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 non -coal 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 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 />Please see Section 4.14.6 in Volume 1. <br />Collom — Rule 4, Page 18 Revision Date: 6/16/17 <br />Revision No.: MR -176 <br />