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6.4.4 Exhibit D — Mining Plan <br />CeII 5 <br />Prior to mining Cells 5 or 6, construction of the hydraulic barrier trench on the <br />west side of the Plumb and Dailey Ditch will be completed as described in <br />Hydraulic Barrier Trench Construction. Following mining of CeII 4, stripping will <br />begin in CeII 5. Overburden from CeII 5 will be stripped and placed in CeII 4. See <br />Exhibit C -2 Mine Plan Map, Sheet 1. <br />CeII 6 <br />Overburden from CeII 6 will be stripped and placed in CeII 5. CeII 6 is the last cell <br />to be mined. <br />Water Diversions and Impoundments <br />Dewatering trenches will be dug at the toes of the pit slopes to facilitate dry <br />mining. Water will be allowed to gravity feed to the west or east of the active <br />mining areas where it will be pumped from a dug sump to Boulder Creek. <br />According to prior approval by the CDRMS, a hydraulic barrier trench will be dug <br />on both sides of the Plumb and Dailey Ditch, and lined with impermeable <br />synthetic material. The hydraulic barrier will hydraulically isolate the Plumb & <br />Dailey Ditch from the local water table and prevent the dewatering operation from <br />affecting ditch flow. <br />Size of Area to Be Worked at One Time <br />Concurrent reclamation will minimize the area requiring reclamation at any one <br />time. Typically, the largest area to be worked at one time will be less than 15 <br />acres <br />The largest volume of overburden /shale stockpiles that will occur at one time will <br />be no more than approximately 750,000 yd Other stockpiles of saleable <br />material will occur onsite beyond above and beyond the 750,000 yd <br />Stabilization of Existing Shale Stockpiles <br />ASCI is currently evaluating several suggested methodologies for stabilization of <br />the currently existing shale stockpiles in CeII 2. These stockpiles will not be <br />added to but will be reduced in size over the next several years. Following the <br />Mining Plan text is a letter report from Dave Chenoweth at Chenoweth and <br />Assoc. outlining several options. ASCI is reviewing these options as well as <br />some other strategies for stabilization. During the course of the amendment <br />review process, a chosen stabilization program will be determined and the <br />reclamation bond will reflect this cost. <br />Turnpike Mining Resource M- 2004 - 009 -AM -2 <br />Regular 112 Amendment <br />