2011-09-09_REVISION - M1981185 (43)

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Mr. Wallace H. Erickson Response to August 19, 2011 Cazier Memorandum September 9, 2011 Page 7 encountered. Samples will be inspected to confirm field classifications and for laboratory testing; • Selected samples will be transported for laboratory testing including moisture content, dry density, strength, classification, grain -size distribution, and compaction tests; • Perform engineering and geologic evaluations to develop conclusions and recommendations regarding the following: o Bench and rock storage area stability; and, o Design for bench and rock storage area stabilization methods, as necessary, to accommodate load bearing necessary for proposed mining operations. • Prepare a technical memorandum summarizing the results of the work described above. • Submit design for bench and rock storage area stabilization methods to DRMS, as necessary, pursuant to the Technical Revision or Amendment process. • After obtaining DRMS approval through the Technical Revision or Amendment process, proceed with remainder of work plan. Adequacy Issue No. 10. Page 7, Chief Portal and Reclaimed Drainage Channel. The third bullet references Attachment U -3 and Table U -12 for channel geometry and estimated flow velocity. Both are in consistent with the information in Attachment U -3. The side slopes in the FlowMaster® computer output following Table U -12 indicate 3H:1V side slopes (not 2H:1 V) and the estimated velocity is greater than 10 fps, not 7.5 fps. Response to Adequacy Issue No. 10. Sides slopes for the Chief Portal and Reclaimed Drainage for the period of operation will be 2:1. The estimated flow velocity will be changed as noted. Adequacy Issue No. 11. Page 7, May Day No. 2 Operational Area Reclaimed Drainage Channel. The first bullet references Attachment U -3 and Table U -11 for channel geometry and estimated flow DEN 97,591,785v2 9 -9 -11 GREENBERG TRAURIG, LLP • ATTORNEYS AT LAW • WWW.GTLAW.COM