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RULE 4 PERFORMANCE STANDARDS <br /> Final reclamation of the East Pit will take place via the sequence shown on Map 29(Spoil Grading <br /> — South Area) with the reclamation blocks advancing from east to west or from the topographic <br /> bottom to the topographic top of the mining areas. Just as in the West Pit, all disturbed areas will <br /> be returned to approximate original contour by grading and backfilling with the use of draglines, <br /> trucks,dozers, scrapers and dozers assisiting a dragline. As reclamation of the East Pit progresses, <br /> all non-reclaimed areas will be contained so that any residual runoff from these areas will be <br /> isolated within the remainder of the East Pit. All methods of erosion control and stability such as <br /> contour ditches, contour furrows, internal ditches and internal sumps will be established on an as- <br /> needed basis to ensure the integrity of the Prospect Pond and the surrounding areas include the <br /> final East Pit Ditch. Closure of the East Pit is dependent on the final reclamation and closure of <br /> the West Pit as the western most portion of the East Pit will tie-in with the West Pit in this area. <br /> A haulroad corridor from the Administration/Shop area to the South Taylor Pit will remain in place <br /> until final reclamation is completed in that area. The corridor is sufficient in width to provide a <br /> material balance as the corridor is regraded to the post mine topography. The <br /> administration/shop/facilities area will be the last area to be reclaimed. A light duty road intended <br /> for post mining use may be left as a postmining feature in this corridor with land owner consent. <br /> In addition, Colowyo controls additional coal reserves west and south of Section 9 and 16, outside <br /> of Permit C-81-019,that may be considered for future mine expansion. It is possible that the final <br /> plans for Section 16 and Section 9 could change to provide for such expansion, with any plan <br /> changes being addressed through an appropriate permit revision. <br /> 4.14.2 General Grading Requirements <br /> The final graded slopes at the mining operation will not exceed the approximate original premining <br /> slope grade as shown on the Postmining Topography Map (Map 19). Colowyo will retain all <br /> overburden and spoil material on solid portions of existing or new benches. The final highwall at <br /> the operation will be eliminated by 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 <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 /> 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 /> 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- <br /> Rule 4 Performance Standards 4-36 Revision Date: 12/20/19 <br /> Revision No.: TR-135 <br />