Laserfiche WebLink
RULE 4 PERFORMANCE STANDARDS <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 />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 />Rule 4 Performance Standards 4-44 Revision Date: 5/25/18 <br />Revision No.: RN -07 <br />