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6.4.4 Exhibit D -Mining Plan <br />of the Plumb and Dailey Ditch as shown in Exhibit C-2, Mining Plan Map Sheet 1 <br />and as described in "Cell 3 Hydraulic Barrier Trench Construction"will be <br />completed. Overburden from Cell 6 will be stripped and placed in Cell 3. Fill <br />material from the Borrow Cell (near Cell 1) will be used to backfill Cell 6 to <br />approximate historic grade. <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 where it will be pumped <br />from a dug sump to Boulder Creek for Cells 3 and 4 (both within 100 feet of the <br />creek) and to recharge trenches for Cells 1, 2, 5 and 6. Detailed information on <br />the recharge trenches can be found in Exhibit G. Maximum dewatering pump <br />rates are estimated at 300 GPM. <br />According to an agreement with the ditch company or approval by the DMG, a <br />hydraulic barrier trench will be dug on both sides of the Plumb and Dailey Ditch, <br />and lined with impermeable synthetic material. The hydraulic barrier will <br />hydraulically isolate the Plumb & Dailey Ditch from the local water table and <br />prevent the dewatering operation from 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. The largest area of un-reclaimed pit area to occur at any one time would <br />exist around year 4, when Cell 2 is nearly half-mined (-34 acres). At this point, <br />approximately 7,500 linear feet of pit wall mined at 0.5:1 would occur. Typically, <br />the largest area to be worked at one time will be less than 35 acres <br />The largest overburden stockpile that will occur at one time will be no more than <br />approximately 150,000 yd3 <br />If a portable recycling plant is operated on site, the maximum amount of broken <br />concrete and broken asphalt to be recycled and the finished product (crushed <br />concrete roadbase and crushed recycled asphalt to be recycled into asphalt <br />mixes) would not exceed 60,000 tons each. All stockpile locations and the plant <br />sites would be graded and compacted and will have perimeter berms. <br />Turnpike Mining Resource M-2004-AM-1 <br />Regular 112 application <br />