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0 <br /> <br />2. The material in the western portion of the pile (Fig. 2) should be cut to <br />a depth of approximately 2 feet and spread over the eastern portion of <br />the pile. The material should be allowed to dry and be disced or turned <br />as required. When the material has dried sufficiently, it should be <br />compacted by wheel-rolling or tracking with a dozer to achieve <br />adequate compaction. <br />3. The remaining 2 feet of fill in place in the western portion of the fill <br />should be allowed to dry in-place and be disced or turned as required. <br />When a suitable moisture content is achieved, the area should be <br />wheel-rolled ortracked with a dozer to achieve adequate compaction. <br />4. After completion of these operations, we should be contacted to <br />observe pile conditions and perform density testing near the surface <br />to confirm compaction (to at least 90 percent of standard Proctor <br />maximum dry density (ASTM D 698) has been achieved. <br />Recommendations for Future Construction <br />We understand Lorencito Coal Company does not plan to place additional coal <br />• development waste onto the pile. Several alternatives are available for disposal of <br />pond dippings and ditch cleaning material. <br />1. Underground disposal into previously mined areas, <br />2. Disposal in the New Elk RDA, <br />3. Disposal on the New Elk coal development waste pile. <br />The pile is currently approximately 120 feet in width, and is being constructed <br />with 2:1 (H:V) side slopes. Assuming at completion a 50-foot wide width will exist at <br />the top of the pile, this results in additional capacity of approximately 18 feet of <br />material. <br />We believe these materials can be placed on the New Elk coal development <br />waste pile, provided they are adequately dried and compacted. The material <br />properties, when dried and compacted, should be sufficient to maintain stability. <br />However, these material are typically very wet when placed and require a significant <br />degree of effort to dry sufficiently to allow satisfactory compaction. If satisfactory <br />compaction cannot be achieved then an alternative disposal method will be required. <br />Disposal in the New Elk RDA will require evaluation of the "dilution" faction to <br />confirm processed waste properties will not be significantly affected. <br />• <br />LORENCITO COAL COMPANY, LLC <br />NEW ELK COAL DEVELOPMENT WASTE PETE <br />CTLR 26,600 3 <br />