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999 <br />• Exhibit 42A <br />Lone Pine Gulch Ventilation Facilities <br />(Technical Revision No. 69) <br />Project Description <br />Mountain Coal Company (MCC) will establish ventilation facilities at Lone Pine Gulch. <br />This area is within the current permit boundary of MCC's Colorado Division of Minerals <br />and Geology Mining and Reclamation Permit No. C-80-007. A bench will be cut and two <br />portals and slopes developed to the B-seam Amine ventilation fan with motor house, a <br />power transformer with switch gear and the necessary security fencing will be constructed <br />on this bench. A fill will be constructed with the soils cut from the bench azea and <br />configured to create a staging area for the portal and fan construction materials. Access <br />will be provided on the bench around the ventilation facilities to maintain the continuity of <br />the existing road through the area. A substation and power line from the substation to the <br />bench will be constructed (MR 122). An upgrade of the existing road from the highway <br />to the fan bench will be necessary (MR 123). These facilities are shown on Map 53A. <br />• The fan will be similar to the existing fan at Sylvester Gulch, and will occupy an area of <br />approximately 106 feet x 16 feet. As required by Federal law, the fan will be offset 15 feet <br />from the return shaft and will be connected to the shaft with ducting. A series of pads and <br />footers will support the fan and motor housing. Security fencing and gates will be <br />installed to limit access to the fan and power transformer areas. <br />The fan bench will be established at approximately 6,480 feet in elevation, and will be <br />sized to accommodate the facilities described above. Approximately 18,000 cubic yards <br />will be cut to construct the fan bench and will be utilized to construct the staging area fill. <br />The bench and staging areas will involve around 2.54 acres of disturbance (see Design <br />Drawings 103F and 104F). This site has an expected life of 10 years, after which time the <br />fan bench will be reclaimed to the approximate original contour (see Reclamation Drawing <br />103F). <br />Approximately 6" of topsoil will be stripped from the site and stockpiled nearby. Soils in <br />this area were identified per Soil Conservation Service surveys (see Map 40, Volume 5) as <br />moderately deep to deep, fine textured Argiustolls and Argiborolls. Due to the steep <br />slopes of this particular site within this soil type, the topsoil is fairly shallow. Per the <br />approved topsoil salvage plan, all available topsoil will be salvaged. <br />Sediment and drainage control will be achieved through the use of diversion ditches, straw <br />bales, silt fence, rip-rapped ditches and ground cover filter areas, etc., where appropriate. <br />. The bench top will be covered, for the most part, by the fan structures or with gravel. The <br />cut and fill slopes of the fan bench and staging area will be hydroseeded and then covered <br />