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Mr. Wallace H. Erickson <br />Response to Sixth Adequacy <br />October 11, 2011 <br />Page 12 <br />DEN 97629,117v1 10 -11 -11 <br />May Day No. 3: Wildcat proposes to obtain geotechnical and <br />rock mechanics /geologic engineering data, and to perform a <br />stability analysis for the highwall at May Day No. 3. <br />Specifically, Wildcat will perform the following: <br />o An engineering geologist will perform a detailed <br />evaluation of the site including reviewing existing <br />geologic data and a detailed site reconnaissance to <br />develop a detailed summary of the rock conditions at the <br />highwall. <br />o Drill two test borings, to 20 feet deep or refusal, at <br />locations identified at the May Day No. 3 bench during <br />site reconnaissance. An engineering geologist will log the <br />borings and obtain relatively undisturbed, bulk samples of <br />the materials encountered. Samples will be inspected to <br />confirm field classifications and for laboratory testing. <br />o As necessary based upon preliminary rock mechanics <br />field observations, obtain appropriate rock sample to <br />perform laboratory analysis of rock mechanical <br />properties. <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; and, <br />• Design criteria for methods to stabilize or reclaim <br />the highwall, as necessary. <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 />GREENBERG TRAURIG, LLP ® ATTORNEYS AT LAW m WWW.GTLAW.COM <br />