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Mr. Wallace H. Erickson <br />Response to Sixth Adequacy <br />October 11, 2011 <br />Page 10 <br />No. 5, Fifth Adequacy Letter (Sept. 9, 2011). A 2(H):1(V) slope at the Chief Portal <br />would encroach upon the adjacent gulch, and would not be necessary in the event <br />Wildcat can demonstrate the highwall is stable. In the event the data collected by <br />Wildcat show the highwall is not stable, Wildcat will submit an appropriate reclamation <br />design to DRMS for review and approval through the Technical Revision or Amendment <br />process. Wildcat will modify Exhibit 6.5 to incorporate its Response to Adequacy Issue <br />No. 5 of the Fifth Adequacy Letter. More specifically, Wildcat will modify the <br />"Highwall" paragraph at page 6 of Exhibit 6.5 as follows: <br />Highwalls: Road cuts will be reclaimed to slopes that are less <br />steep than 0.7(H):1(V). The highwall at May Day No. 2 will <br />be reclaimed to a slope equal to or less than 2(H):1(V). <br />Wildcat will perform a geotechnical stability analysis to <br />demonstrate the reclaimed surfaces of highwalls at the May <br />Day No. 1, May Day No. 3 and Chief Portal are stable in the <br />configurations proposed by Wildcat in Figures F -1, F -5 and <br />F -5A, and in the event the data collected during this analysis <br />demonstrate instability Wildcat will submit revised <br />reclamation plans through the Technical Revision or <br />Amendment process, as follows: <br />May Day No. 1: 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. 1. <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 four test borings, to 20 to 60 feet deep or refusal, at <br />the approximate locations shown in Figure 6.5 -1. An <br />engineering geologist will log the borings and obtain <br />relatively undisturbed, bulk samples of the materials <br />encountered. Samples will be inspected to confirm field <br />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 />DEN 97,629,117v1 10 -11 -11 <br />GREENBERG TRAURIG, LLP ® ATTORNEYS AT LAW DI WWW.GTLAW.COM <br />