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<br /> <br /> <br />1 <br /> <br />LJ <br /> <br /> <br />1 <br /> <br /> <br /> <br /> <br /> <br />1 <br />1 <br /> <br />LJ <br /> <br />N detail ~~P this mining oper•at ion is contained on Sheet 'c' of <br />Exhibit C, q cross section on this Sheet f~_t ether explains tht:! <br />mining oper•ati~~n. It is an efficient nrininq ~~qer^ation based on <br />high volume output. <br />rli~ing Will begin in the. Phase S area. Excavation will always <br />stat•t at the low enq of the Phase. In this way r•~anoff will dr•air~ <br />in the opb~~site direction of the mining. The first step in the <br />mining is to remove the surface soil layer with a scraper. <br />Next the t~ver•b~_tr•den will be removed. gfter• the first nrininq c~_it, <br />both 5t~i1 types can be stripped and directly deposite6 on top oY' <br />the undersize material which has been knocked down from the <br />pr•evio~s nrininq cut. In this way there will be no over•bur•den ur~• <br />togs~~i I stockpi les. Rlth~~uoh in the initial nrininq cut, b~~th <br />must be stockpiled to the side. Thus they will be handled twic[~:! <br />in the fir•tat cut of each mininn phase. Tne mining eat.ti bnrent can <br />then be movetl in and the eats can begin witn the cutter, scalper, <br />and cr•usher•. T'he cuts will 6e made in a n~?r•th!'south direction <br />and move westerly uo the slope. Between c0 and 40 acres will bt2 <br />n11 Wed each yedr•. <br />Since there 15 n~~ Sand and gravel resource Within the flo~~dplain <br />of Lone Tree Creek, no nrininq will occur there. At least a 20~T <br />foot setback Will be maintained from the Creek Channel. The <br />mining will begin on too of the bluff above the Creek.. By <br />beginning the mining this way, a berm will be created between the <br />Creek. and the excavation area. Sheet c of Exhibit C contains ¢z <br />typical cross section of the berm. In or•der• to allow runoff to <br />pass through the berm and into Lone Tree Creek, we will, <br />occasionally cut runoff channels tnr•~~ugh the berm. Tnese <br />channels will have 3:1 side slopes and be rocked to or•event <br />erosion. By r•egulat inq the elevation of these r•un~~ff channels <br />thr•ouoh the berm, we can create settling ponds behind the berm <br />where arty sediment can fall ~~ut from the r^t.tnoff water. Thus <br />water puality in Lone Tree Creek. can be maintainer. <br />D - c <br />