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<br />' T880161 <br />' to stripping the next increment. Note that future mining will be carried out such that <br />the quarry slopes will be mined no steeper than 2.5 H to 1 V to facilitate final <br />reclamation. Figure D.5 presents north-south and east-west cross sections of the quarry <br />at a time when the first new increment of the quarry is being mined and after the <br />northern and eastern stockpiles of overburden have been pushed into the quarry to <br />' establish final grades at the northern end of the quarry (approximately after 10 years of <br />mining). The existing overburden stockpile located at the western edge of the present <br />1 quarry will be reserved for use in reclaiming the portion of the quarry last mined. <br />Additional reclamation details are discussed in Exhibit E. <br />1 <br />1 <br />1 <br /> <br />Shale will be mined using a Caterpillar 245 excavator to rip the material from the <br />quarry floor and load it directly into off-highway trucks of 35- to 50-ton capacity. The <br />trucks, in turn, will haul the shale to an in-pit primary crusher (feeder-breaker). After <br />reduction to a nominal minus 5-inch size, the shale will be transported from the quarry <br />by conveyor to a secondary crushing facility located on the eastern edge of the quarry. <br />After final size reduction, the minus 1-inch material will be conveyed beneath Highway <br />93 via an existing underpass to storage silos at the plant site. Subsequently, the <br />material is fed into a rotary kiln where it is heated to 2,000° F to produce lightweight <br />aggregate.. <br />1 <br /> <br /> <br /> <br /> <br />1 <br /> <br /> <br />As the quarry is deepened and expands through routine mining operations, the feeder- <br />breaker vrill be moved and the quarry conveyor extended to minimize truck haulage <br />distances. The mining plan currently calls for excavation of 1,200 to 1,500 tons of <br />shale per day. The quarry will operate during daylight hours only, seven days per week. <br />The lighi,veight aggregate plant will produce between 300,000 and 500,000 cubic yards of <br />aggregate annually for up to 30 years. <br />Runoff Control <br />Precipitation runoff and any water which originates from seeps at the overburden-shale <br />interface will be intercepted by a ditch and will be channeled around the pit to a <br />catchment pond on the quarry floor as shown in Figure D.2. The location of this pond <br />will be shifted from time to time to permit uniform deepening of the quarry floor. <br />-6- <br /> <br />