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the fall of 1999 that had experienced damage due to subsidence of Longwall Panels 5R <br /> and 6R. Twentymile Coal scaled loose rock from the slope above Routt County Road <br /> No. 33 prior to undermining Longwall panel 12R, and placed temporary concrete <br /> barriers or chain link meshing along the north side of Routt County Road No. 33, to <br /> ensure that rockfall would not reach the road. <br /> Union Pacific Railroad <br /> Previously, when monitoring indicated that the track was damaged or the grade had <br /> changed, a slow speed restriction was instituted. Re -leveling and repair of the track <br /> occurred in accordance with mitigation plans required by Union Pacific Railroad. <br /> During the mining proposed with PR-10, TC will monitor the railroad track for <br /> subsidence impacts. TC will pre -ballast and/ or re -level portions of the railroad track to <br /> assure no service to the mine is disrupted. TC has indicated that these methods were <br /> successfully implemented in the past during mining in the Eastern and Northern Mining <br /> Districts. <br /> Hayden-Gore Pass Powerline <br /> TC notified the utility company 30 days prior to undermining the powerline in addition <br /> to the Division's requirement to provide six months notification prior to undermining. <br /> TC monitored the powerline structures daily. The powerline was subsided without <br /> interruption or significant damage to the powerline towers. Power company personnel <br /> inspected the powerline after subsidence had occurred and found that deformation of <br /> the structures was within company specifications and did not require Twentymile Coal <br /> to conduct repairs. Information regarding subsidence of the Hayden-Gore Pass <br /> powerline can be found in the 1997 and 1998 Subsidence Reports. <br /> Archer-Hayden, Western Area Power Administration, Tri-State, and Public Service <br /> Powerlines <br /> A monitoring plan for the Archer-Hayden powerline was approved by the powerline <br /> operator and incorporated into Exhibit 7e-7 of the PAP. No significant damage or <br /> interruption of power was experienced during the subsidence of the Archer-Hayden, <br /> Western Area Power Administration, Tri-State and Public Service powerlines. <br /> Twentymile Coal proposes to subside portions of powerlines with Western Mining <br /> District Longwall panels 13L, 14L, 15L, 16L, and 17L in Township 5 North, Range 87 <br /> West, Sections 23 and 26. Twentymile Coal Company has undermined and subsided <br /> powerlines in the EMD and NMD without any significant damage or disruption of <br /> service. Twentymile Coal anticipates subsidence at portions of the Yampa Valley <br /> Electric Line serving the mine located above the SRT, 6RT and 7RT Longwall panels <br /> in sections 15, 14 and 11 in Township 5 North, Range 86 West. Monitoring and <br /> control plan are included in the PAP. TC may reroute power in the unlikely event the <br /> powerline is temporarily impacted. Once the line is stabilized, power would be <br /> restored to the line. <br /> Foidel Creek Mine 33 August 4,2023 <br />