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West Elk Mrne <br />Much of the information and assumptions used in the revised "time to fill" calculations have <br />remained the same. Those that have been modified since the 1994 estimate (for the Box Canyon <br />and SOD permit revisions) include: <br />• Approximate Apache Rocks Mining Area, including the three western and four eastern panels <br />(B Seam) - Longwall Panels (66,999,000 ft z) and Development Areas (20,022,000 ft.z) <br />• Approximate Box Canyon Mining Area (B Seam) - Longwall Panels (46,930,000 ft z) and <br />Development Areas (23,121,000 ft. ) <br />• Approximate IONS and 11NE Longwall Panel Area (B Seam) - Longwall Panels (6,603,000 <br />ft.) and Development Areas (4,362,000 ft.Z) <br />• Average sustained inflows (2003) observed into the mine (100 gpm, 161.3 AF/yr or 7,026,738 <br />ft 3/yr.) <br />• Maximum inflows (1996) observed into the mine (8,000 gpm) or (175,668,449 ft.3/yr) <br />• Approximate South of Divide mining azea El-E9 panels (E Seam) - Longwall Panels <br />(92,996,122 ftz) and Development Areas (1,787,471 fl <br />• Average additional sustained inflows into the E Seam workings from the SOD mining area (100 <br />. gpm or 7,026,738 ft.3/yr) <br />• Maximum additional inflows into the E Seam workings from the SOD mining azea (1,700 gpm) <br />Using these revisions to the "time to fill" calculations results in the following: <br />• Time to fill F Seam workings (100 gpm) = 14.9 yeazs <br />• Time to fill Jumbo Mountain (8NW and 9NV~ B Seam workings (100 gpm) = 17.7 yeazs <br />• Time to fill Northwest Panel (1NW to 7NVl~ B Seam workings (100 gpm) = 26.6 yeazs <br />• Time to fill Apache Rocks (three western and four eastern panels) B Seam workings (100 gpm) <br />= 65.8 years <br />• Time to fill Apache Rocks (three western panels) E Seam workings (100 gpm) = 31.0 years <br />• Time to fill the LONE and 11NE Panels B Seam workings (100 gpm) = 7.5 years <br />• Time to fill Box Canyon (18NE to 23NE) B Seam workings (100 gpm) = 49.9 yeazs <br />• Time to fill SOD (El-E9) E Seam workings (100 gpm) = 73.5 years <br />• <br />2.05-I63 Revised June 1005 PRIG; Rev. Mach 1006; Rev. May 1006 PRIO <br />