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1 <br />' T880161 <br />' MINING PLAN EXHIBIT D <br />Shale feed for the lightweight aggregate plant will be mined }'rom an existing 18-acre <br />quarry located in Section 5, T2S, R70W. The quarry was last reined by Great Western <br />Aggregate Company in 1975 and was ]eft unreclaimed as it was a prelaw operation. <br />Current rrtining plans involve mining within the previously disturbed area for the first 8 <br />to 10 ye~irs. Thereafter, overburden will be removed from the southern side of the <br />' quarry to expose additional shale to feed the process plant. The removed overburden <br />will be used directly in reclaiming the mined out portion of the quarry. Later, when <br />mining operations cease, overburden that was previously stripped and stockpiled on the <br />' western edge of the quarry by Great Western will be used to reclaim the area last <br />mined. <br />' Mine Ouerations <br />Mine operations will begin with pumping approximately 200 acre feet of water that has <br />' accumulated over the years in the quarry bottom into Coal Creek. This one time <br />discharge has been authorized by a NPDES discharge permit ort file with the Colorado <br />Department of Health, Water Quality Control Division. Simultaneously, about 3,000 cubic <br />yards of overburden material which overlies a planned solid waste containment site will <br />be removed. This material will be placed adjacent to the Highway 93 right-of-way, <br />' filling a gap in an existing berm which obscures most of the quarry from the view of <br />highway travelers. The fill will be revegetated per the methods described in Exhibit E. <br />' Figure D.1 presents the quarry as it currently exists and shows the locations of the <br />proposed waste containment site and the berm fill and shows ttie 108-acre permit area <br />' boundary. <br />Figures D.2 through D.4 show how the quarry is developed over time. As indicated <br />above, initial mining occurs within the already disturbed area of the quarry. Then <br />mining progresses to the south incrementally. Each southw;trd increment involves <br />stripping overburden from an 8 to 10 acre strip to expose <<dditional reserves and <br />placing this overburden on slopes and the bottom of the mined out portion of the <br />' quarry. Then the newly exposed section is mined out to the ultimate quarry depth prior <br />' -5- <br />