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RULE 4 PERFORMANCE STANDARDS <br />• As the mining operations remove coal seams, the mining azea must be left open until such time as the <br />lower-most coal seam can be recovered. With the mining configuration, the time differences between <br />mining the upper-most seam versus the lower-most seam will be greater than 180 days. As the operation <br />advances, backfilling will be as contemporaneous as practical but not so as to interfere with removal of <br />the lower-most coal seam. Colowyo will rough backfill and grade as shown on the Map 29A. All <br />disturbed areas will be returned to the appropriate final contour by grading and backfilling with the use of <br />a dragline, trucks, dozers, and scrapers. Additional detail of the backfilling and grading for the mining <br />operation is set forth in the discussion under Sections 2.05.3 and 2.05.4. <br />The area to be mined will be restored to a topography approximating pre-mining grades. The slopes of <br />backfilled aeeas, as necessary, will utilize terraces and/or contour furrows for erosion control and stability. <br />These terraces and contour furrows will be constructed according to the requirements outlined in Section <br />2.06.2. Where applicable, Colowyo will retain all overburden and spoil on the solid portion of existing <br />benches. The final graded slopes will not exceed the approximate original pre-mining slope grade as <br />shown on the Map 19B. Post-mining surface drainage channels will be located to minimize erosion and <br />to 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 19B. Colowyo will retain all overburden and spoil material on solid portions of <br />existing or new benches. The fmal highwall at the operation will be eliminated by backfilling overburden <br />into the final pit area. <br />Small depressions of a holding capacity slightly Beater 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. Also, several stock watering ponds <br />will be constructed to compliment the post-mining land use. Providing a supply of water is an integral <br />part of the grazing post-mining land use. Colowyo will not be mining on any slopes above 20° as shown <br />on Map 18A. <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 29A. <br /> <br />South TaylodLower Wilson -Rule 4, Page 24 Revision Date: 3/30/07 <br />Revision No.: PR-02 <br />