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I~ <br />proposed decision to approve was issued on October 10, 2002. <br />Technical Revision No. 35 <br />TR-35 was submitted on February 1, 2002. It addressed temporary and <br />permanent stock ponds. The proposed decision to approve was issued on <br />August 20, 2003. <br />Technical Revision No. 36 <br />TR-35 was submitted on June 14, 2004. It presented updates to postmine <br />channel designs and the hydrologic monitoring plan. The proposed <br />decision to approve was issued on January 26,2005. <br />Permit Revisions - Wolf Creek Permit Revision <br />The Wolf Creek permit revision was the only major change to the approved <br />permit which required a permit revision. The reason for the term permit <br />revision rather than a technical revision was the fact that PCC proposed <br />to mine an area within the designated life-of-mine area (but within the <br />permit boundary) previously not proposed for mining. <br />In this Hermit revision, PCC proposed to mine further down the hill in <br />the Wolf Creek area than was originally planned. In doing so, mining <br />operations would require that the dragline cast the overburden into an <br />adjacent drainage. This brought about two major issues, slope stability <br />and excess spoil. <br />CMLRD was concerned that material cast into the drainage could <br />potentially be unstable. PCC engineers ran slope stability analysis <br />using computer programs to predict the actual factor of safety against <br />slope failure after reclamation. Rctual site and spoil characteristics <br />were used in the analysis as well. In order to insure that the slope <br />would not become 100$ saturated over time, an underdrain was designed to <br />allow passage of ground water through the fill so as not to compromise <br />the integrity of the fill. <br />The other aspect of the plan was the requirement to address the excess <br />spoil regulations. PCC, in the revision, positively demonstrated that <br />approximate original contour (AOC) was to be achieved even with the <br />amount of spoil being cast into the drainage. <br />The above engineering aspects led directly to the other major sections <br />TR-37 9 Revised 04/05 <br />