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The buttress will be constructed in phases, as shown on the permit drawings. Phase 1 will be <br />constructed in 2011. It is anticipated that construction of Phases 2 and 3 will be completed by end of <br />2014, but the schedule could be extended if rock buttress construction material is not available in <br />adequate quantities from refuse pile foundation excavation to meet this schedule, or if development <br />of the refuse pile is delayed to unforeseen changes in operating conditions for the West Elk Mine. <br />Conversely, if ample rock is available and if refuse capacity is needed, the rock buttress construction <br />will be accelerated. <br />Initial placement of refuse in the disposal area will be phased in coordination with buttress <br />construction, as shown on drawings C -04A ad C -06A. The top of the refuse slope will be placed at <br />or below the top of the rock buttress. The Phase 1 -2 refuse pile zone shown on the drawings <br />provides storage for approximately three to four years of refuse at the generation rate shown in <br />Appendix G. This fill zone correlates to the period after Phase 1 of the rock buttress has been <br />constructed and before Phase 3 has been constructed. Phase 2 of the rock buttress does not result in <br />additional refuse pile capacity because it is a widening of the base of the buttress, but does not raise <br />the top of the buttress. After Phase 3 of the rock buttress has been constructed, the face of the refuse <br />slope will be raised to fill the Phase 3 refuse zone shown on the permit drawings. The refuse fill will <br />then proceed up the draw consistent with the permitted design. <br />4.3 Underdrain <br />The underdrain has been designed and will be constructed in accordance with Rule 4.10.3, more <br />specifically, the alterative underdrain design as provided in Rule 4.10.3(5). <br />The refuse pile is situated above the uppermost coal and shale seams. Clearwater drainage diversions <br />will be maintained above the working bench of the refuse pile to divert surface water away from the <br />refuse pile. Runoff from the working pad will be drained to the sediment ditches east and west of the <br />pile. Therefore, the only water that would drain to the underdrain would be minor percolation <br />through the pile and seeps that may be uncovered in the colluvium under the refuse pile footprint. <br />Revised August 31, 2010 <br />Revised July 21, 2011 �hs <br />P \Mpls \06 CO \26 \06261003 RPE E Permit Mod Support \WorkFtles \Permit Apphcation \Text \Exhibit 82 RPEE design 2011 -07 -21 TR 127 doc 18 <br />