2022-09-29_PERMIT FILE - C1980007 (2)

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West Elk Mine s Approximate Box Canyon Mining Area (B Seam) — Longwall Panels (46,930,000 t and Development Areas (23,121,000 ft.2) + Approximate IONE and 11NE Longwall Panel Area (B Seam) — Longwall Panels (6,603,000 ft.2) and Development Areas (4,362,000 ft.2) • Average sustained inflows (2003) observed into the mine (100 gpm, 161.3 AF/yr or 7,026,738 ft.3/yr.) • Maximum inflows (1996) observed into the mine (8,000 gpm) or (175,668,449 ft.3/yr) • Approximate South of Divide mining area LWE1-LWE17 panels (E Seam) —Longwall Panels (92,996,122 ft2) and Development Areas (1,787,471 ft2) + Average additional sustained inflows into the E Seam workings from the SOD mining area (100 gpm or 7,026,738 ft. 3/yr) o Maximum additional inflows into the E Seam workings from the SOD mining area (1,700 gpm) Using these revisions to the "time to fill" calculations results in the following: •. Time to fill F Seam workings (100 gpm) = 14.9 years • Time to fill Jumbo Mountain (8NW and 9NW) B Seam workings (100 gpm) = 17.7 years : Time to fill Northwest Panel (1NW to 7NW) B Seam workings (100 gpm) = 26.6 years • Time to fill Apache Rocks (three western and four eastern panels) B Seam workings (100 gpm) = 65.8 years + Time to fill Apache Rocks (three western panels) E Seam workings (100 gpm) = 31.0 years • Time to fill the LONE and 11NE Panels B Seam workings (100 gpm) = 7.5 years + Time to fill Box Canyon (18NE to 23NE) B Seam workings (100 gpm) = 49.9 years Time to fill SOD (El-E17) E Seam workings (100 gpm) = 73.5 years Cumulatively, the estimated "time to fill" the entire West Elk Mine workings in all three coal seams is approximately 290 years (maximum fill time) based on current inflow observations and those additional inflow estimates assumed for the South of Divide mining area. F Seam Impacts on Groundwater 2.05-263 Rev. 06/05- PR10. 03106- PR10. 05106- PRIG ; 12/21- TR150