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RULE 2 PERMITS <br /> 2.05.4 (2)(b) Reclamation Costs <br /> The estimate of the cost of reclamation of the operations required to be covered by the performance bond <br /> is found under Rule 3. <br /> 2.05.4 (2)(c) Backfilling Plan <br /> As the mining progresses to the west, overburden material from each successive cut will be backfilled <br /> into the previously mined out area and the additional spoil will continue to buildup in previously mined <br /> areas. This cycle will be repeated for the entire mining area. Due to shape, size and depth of the South <br /> Taylor pit results in leaving the majority of the spoil backfilling process until final pit closure. As a <br /> result, Colowyo has been granted a variance for a delay in contemporaneous reclamation based on Rule <br /> 4.14.1(1)(d) which states that "Rough backfilling and grading shall be completed within 180 days <br /> following coal removal and shall not be more than four spoil ridges behind the pit being worked..". The <br /> mining techniques utilizing dragline and truck/shovel operation are shown in detail on Mining Range <br /> Diagram (Map 2413), and show the approximate distance between topsoil removal and replacement. <br /> Premining topography is presented on Map 18A and the postmining topography is shown on Map 19B. <br /> Map 20B provides cross-sections of the premining and postmining topography. Map 28 presents the <br /> topsoil handling movements and the timing of stripping activities. Map 29 shows the spoil grading <br /> sequence timing of reclamation activities. <br /> The backfilled mining areas will be graded to establish a stable post mine topography that blends into the <br /> undisturbed areas outside the mining limits (Map 1913). Colowyo will grade all final slopes so that overall <br /> grades do not exceed 33% (Map 2013). Additional information on the backfilling and regrading plan are <br /> discussed further in Volume 1, Section 2.05.4 and Section 4.14. <br /> 2.05.4 (2)(d) Topsoil Salvage and Replacement <br /> Prior to any mining-related disturbances, all available topsoil will be removed from the site to be <br /> disturbed as discussed in Section 2.05.3, and will be redistributed or stockpiled as necessary to satisfy the <br /> needs of the reclamation timetable. <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. If spoil compaction is a problem,the spoil will <br /> be ripped with a dozer to minimize compaction, assure stability and minimize slippage after topsoil <br /> replacement. <br /> Topsoil will normally be reapplied by hauling in trucks or scrapers, from topsoil stockpiles or from areas <br /> where topsoil has been removed for mining advance, to the regraded spoil areas and then redistributed <br /> with scrapers and/or dozers. Topsoil replacement depths for the South Taylor area are discussed in <br /> Volume 1, Section 2.05.4. <br /> Reapplied topsoil will be left in a rough condition to control wind and water erosion prior to seeding. <br /> Seedbed preparation, other surface manipulation practices, and seeding will be completed primarily <br /> during the fall months. Contour furrows, approximately 4-12 inches deep at the deepest point and 20-36 <br /> inches wide, which have been used on slope areas very successfully during the past years,will be used on <br /> as needed to reduce erosion potential, conserve moisture, and maintain site stability until vegetation is <br /> sufficiently established. The size of the furrows may be increased if necessary to control erosion, and the <br /> distance between the furrows will vary, depending on each application. Small rock check dams may also <br /> South Taylor/Lower Wilson—Rule 2,Page 75 Revision Date: 6/22/20 <br /> Revision No.: MR-220 <br />