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• 2. The mine service buildings. <br />3. The fuel storage facilities. <br />IV.B.t Mine Entries The "D" portal consists of atwo-tunnel system. The first of these tunnel <br />entries is divided into an upper compartment for the conveyor and a lower compartment for <br />personnel and equipment access and ventilation intake. The second tunnel is used for ventilation <br />exhaust. The entry system at the East Portal ventilation area (see Map 139) consisted of two <br />tunnels used for ventilation exhaust. The two tunnels at the ventilation area were extended from <br />underground working in the "D" seam. They reach the surface at the outcrop of the "D" seam coal. <br />The East Portal entries were sealed and reclaimed in 2000 and 2001. <br />The two tunnels at the "D" Portal area have similar characteristics. They penetrate the ground <br />surface as a rock tunnel and descend to the coal seam at a slope of 14 to 16 degrees. They were <br />constructed by conventional means (blasting and mucking) followed by installation of steel tunnel <br />supports with steel or wood lagging. <br />A "B" portal and access slope is driven from near the bath house structure down to the B Searn. <br />(See Map 101). <br />The conveyor and equipment tunnel entry and the "B" Portal are used to transport men and <br />• materials in and out of the mine. Rubber-tired vehicles are used for transportation of both men and <br />materials. <br />The D portal entry areas are protected by a reinforced concrete face-up structure approximately 20 <br />feet high and 2 feet thick. A tunnel structure consisting of structural steel members covered with <br />corrugated steel plates extends from the concrete face-up structures into the hillside. Protection <br />from falling rock is provided by a barrier fence and bench above the entries. A similar structure is in <br />place for the "B" Portal. <br />All mine entries are inspected regularly for cracks in the concrete walls, breaks in the barrier fences <br />and excessive loose stone on the benches. The bare rock slopes are also inspected for large <br />pieces of rock that could break loose. In such cases, these pieces will be broken loose and <br />removed. Should an excessive number of small rocks become a problem, the related rock face will <br />be covered with chain-link fence held in place with rock bolts and sprayed with concrete. <br />When a set of entries is no longer required, it will 6e sealed in an acceptable manner (see <br />Reclamation Plan). The concrete face up walls and the steel structures will be removed. The entry <br />area will then be backfilled and regraded. <br />• Permit Rev. 4 (07/2002) IV-3 <br />