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. 2.05.3 (b) Operation Plan: Eaistine Structures Refer to Sections 2.05.3(2)(b) and 2.05.3(3)(a) for discussions of the proposed rock tunnels and portals and the West Mine facilities. Earth work development began at the East Mine during October, 1975. Major excavation work was completed by mid-1976. Construction work on the mine facilities storage and loadout facilities, and sewage treatment plant began in 1976 and were completed at various times until August, 1977 when the train loadout became completely operational. All mine structures, including buildings, portals and ventilation shafts, were designed and constructed using accepted engineering practices. The design/constructors used applicable codes to insure safety, stability and environmental protection. The mining facilities are located in SW'/. NE'/. and NW'h SE'h, Section 24, T.13 S., R.92 W., 6th P.M. The storage and load-out facilities are located in the NW'/a SE'h and E'/: SW'/. o f Section 29, T. 13 S. %.3056U, R91 W., 6th P.M. (See the Orchard Valley Mine Facilities Map 8A-8.) Mine Facilities The following description of mine facilities begins at the uppermost bench and moves down through the facility to the train loadout as if following the flow of the coal. Refer to Map 8-1 for exact location of all buildings. At the uppermost bench (elevation of 7,421 feet), there are two thirty-foot diameter, 240-foot deep air shafts. They were constructed in 1976-77 using conventional drilling and blasting techniques. The west shaft provided fresh intake air. The air was exhausted through two axial vane fans constructed on the east shaft. Due to the June 1, 1986, mine fire, these intake and ex- haust shafts were sealed. The existing fans were removed. (See Section 2.05.4(2)(g) for information on abandonment of the shafts.) Also located on this bench area 300,000 gallon and a 100,000 gallon water storage tank. They were constructed using a conventional welded steel plate technique and are atop a reinforced concrete foundation mat. They provide water for fire fighting, underground water needs, shower, sanitary, and domestic needs of the office, shop, and warehouse facilities. A water supply pipeline has been constructed to connect these tanks with the Steven's Gulch well field. The pipeline is constructed using 4" diameter pipe. A buried 7.2 KV power line parallels the pipeline. Overhead support structures carry the line to the tanks at the fan level. The uppermost bench may also be used for storage of lazge warehouse items, as necessary. Two mine access portals were constructed at an elevation of 7,170 feet, on the portal level. They utilize corrugated steel tunnel liners and concrete structures. • Plans of all existing mine facilities can be viewed at the East Mine. Because these are in place TR-32 - 20 - 9199 ~~ S/o D