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West Elk • One of the major components of the mine ventilation program is the Sylvester Gulch Fan. This facility is located in Sylvester Gulch, approximately one-half mile south of the mine facilities area. Information concerning the design and operation of the fan is contained in Exhibit 42. The Lone Pine Gulch Portals were situated approximately one (1) mile west of Somerset, Colorado, at an elevation of approximately 6,480 feet. The Lone Pine Fan Facility was constructed in 1995, accessing the B Seam, to serve West Elk Mine as the primary ventilation facility for the then completed Northwest Longwall Panels (Nos. 1-7}; the Jumbo Mountain Longwall Panels (Nos. 8 and 9), and the Southern Longwall Panels (Nos. 12, 13, 13A). These 12 longwall panels were isolated underground from the active workings, using explosion resistant seals, and the entire area is now abandoned. Watertight bulkheads were installed in each of the portals in 2001. The designs, portal profiles, and plan view of the bulkheads are shown on Drawing Nos. 42A-1, 42A-2, 42A-3 included in Exhibit 42A, in Volume 7 of the Permit Document. The area was reclaimed in 2002 and 2003. In order to assure adequate mine ventilation for West Elk Mine's current and future mining areas, new ventilation shafts (intake and exhaust shafts) were constructed. Construction of the site for the lazge intake shaft and the large return shaft began during spring of 1997 and shaft sinking began in the fall of 1997. The ventilation facility is located approximately one half mile from the existing Sylvester Gulch Fan (Map 53B). Information regarding the design, construction and operation of the ventilation facility is contained in Exhibit 69. A third ventilation shaft (Vent Shaft #3) was constructed during the summer and fall of 1997. Vent Shaft #3 is a 10-foot fuushed diameter shaft located approximately 400 feet east of the electric borehole site (Map 53B). Information regarding the design, construction, and operation of the ventilation facility is contained in Exhibit 69. Derasitication Site A degasifrcation borehole is located approximately 225 feet west of the electric borehole site in Sylvester Gulch. It was constructed during the summer of 1997. This borehole is not currently operating. Recent installation of methane drainage facilities in Sylvester Gulch accommodates West Elk Mine's "in-mine" methane collection and transmission system. Methane gas, captured in the mine, is collected and transported in poly-pipe up Ventilation Shaft No. 3 and then vented. Some methane gas from the mine is used to heat mine ventilation air at Ventilation Shaft No, 1, in a system completed in 2003. Mine DewaterinP and Treatment Facilities Description Sylvester Gulch MCC has designed mine dewatering and treatment facilities to be located within the Sylvester Gulch drainage. The system consists of one 18-inch cased borehole, one 16-inch borehole (completed as a IZ-inch cased hole}, and two 20-inch cased boreholes, completed during the summer of 1997 to access the operational sump in the northeast corner of the IONS Tailgate. 2.05-2] Revised June 1005 PRIG; Rev. January 2006; Rev. March 2006; Rev. April 2006 PRl0, May 2006 PRIG