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Mr. Wallace H. Erickson <br />Response to Sixth Adequacy <br />October 11, 2011 <br />Page 11 <br />DEN 97,629,117v1 10 -11 -11 <br />o Selected samples will be transported for laboratory testing <br />including testing for rock mechanical properties, moisture <br />content, dry density, strength, classification, grain -size <br />distribution, and compaction tests. <br />o Perform engineering and geologic evaluations to develop <br />conclusions and recommendations regarding the <br />following: <br />• Stability of the highwall; <br />• Design criteria for methods to stabilize or reclaim <br />the highwall, as necessary; <br />• Location of the cut -fill line on the pad, the <br />stability of the fill pad, and criteria for mitigating <br />unstable areas /conditions; <br />• Mitigation of conditions that might lead to a portal <br />collapse; <br />• Grading recommendations, including the <br />suitability of onsite materials for use as fill, fill <br />placement and compaction, and allowable cut and <br />fill slopes; and, <br />• Design criteria for steel set foundations (see <br />Attachment D -2, Figure D -2), including allowable <br />bearing capacity and ground improvement <br />approaches as necessary, rock bolting, or other <br />remedial support strategies. <br />o Prepare a technical memorandum summarizing the results <br />of the work described above. <br />o Submit revised design plans for portal stabilization, <br />including repair drawings and specifications, or revised <br />reclamation plans and maps, as necessary, through the <br />Technical Revision or Amendment process. <br />o After obtaining DRMS approval through the Technical <br />Revision or Amendment process, proceed with remainder <br />of work plan. <br />GREENBERG TRAURIG, LLP W ATTORNEYS AT LAW Ix WWW.GTLAW.COM <br />