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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) Baclcfilling Plan <br />As the mining progresses to the southeast, overburden material from each successive cut will be <br />backfilled into the previously mined out azea and the additional spoil will continue to buildup in <br />previously mined aeeas, thus creating a large in-pit temporary spoil pile. This cycle will be repeated for <br />the entire mining area. Due to shape, size and depth of the South Taylor pit, results in leaving the majority <br />of the spoil backfilling process until fmal pit closure. As a result, Colowyo has officially requested a <br />variance for a delay in contemporaneous reclamation based on Rule 4.14.1(1)(d) which states that "Rough <br />backfilling and grading shall be completed within 180 days following coal removal and shall not be more <br />than four spoil ridges behind the pit being worked..". The mining techniques utilizing dragline and <br />truck/shovel operation aze shown in detail on Mining Range Diagram (Map 24A), and show the <br />approximate distance between topsoil removal and replacement. Premining topography is presented on <br />Map 18A and the postmining topography is shown on Map 19B. Map 20B provides.cross-sections of the <br />premining and postmining topography. Map 28B presents the topsoil handling movements and the timing <br />of stripping activities. Map 29A shows the spoil grading 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 19B). Colowyo will grade all final slopes so that overall <br />grades do not exceed 33% (Map 20B). Additional information on the backfilling and regrading plan aze <br />• discussed further in Volume 1, Section 2.05.4 and Section 4.14. <br />2.05.4 (2)(d) Topsoil Salvage <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. The average uniform topsoil replacement depth will be 19.8 inches as determined by the <br />topsoil salvage calculations shown on Tables 2.04.9-6, 2.04.9-6A, and 2.04.9-7. Topsoil may be applied <br />at depths that are lesser or greater than the specified depth in selected areas where plants, that may require <br />a shallow or deep soil, will be established in conjunction with the proposed post-mining land use. Areas <br />that require a variable topsoil depth replacement plan will be addressed through a Technical Revision to <br />the permit after approval of PR-02. Topsoil will normally be reapplied by hauling, in trucks, from topsoil <br />stockpiles or from areas where topsoil has been removed for mining advance, to the regraded spoil areas <br />and then redistributed with dozers. Alternate methods may also include placing topsoil on slopes with a <br />dragline followed by redistribution with dozer, or using a scraper to redistribute the topsoil. When <br />necessary to ensure replacement to the required depths, replacement depths will be staked on the regraded <br />spoil. <br />• <br />South Taylor/Lower Wilson -Rule 2, Page 104 Revision Date: 4/16/07 <br />Revision No.: PR-02 <br />