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occurred in accordance with mitigation plans required by Union Pacific Railroad. <br />During the mining proposed with PR -11, TC will monitor the railroad track for <br />subsidence impacts. TC will pre -ballast and/or re -level portions of the railroad track <br />to assure no service to the mine is disrupted. TC has indicated that these methods <br />were successfully implemented in the past during mining in the Eastern and Northern <br />Mining 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 />With PR -11, TC proposes to undermine and subside 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. Twentymile Coal <br />Company has undermined and subsided powerlines in the EMD and NMD without any <br />significant damage or disruption of service. Twentymile Coal anticipates the <br />powerlines overlying Longwall panels 5RT, 6RT and 7RT proposed with PR -11 will <br />react in the same manner; however a monitoring and control plan is included in the <br />PAP. TC may reroute power in the unlikely event the powerline is temporarily <br />impacted. Once the line is stabilized, power would be restored to the line. <br />Existing Residences/Structures <br />Three residences were undermined and subsided during the mining of Eastern Mining <br />District longwall panels 6R and 5R. One residence is occupied year-round; one is <br />inhabited on a limited basis, while the third was vacant and owned by Twentymile <br />Coal. <br />Twentymile Coal has a subsidence agreement with the owners of the residences not <br />owned by Twentymile Coal. Twentymile repaired subsidence damage to the smaller <br />residence and replaced the larger residence. Persons living in the larger residence <br />Foidel Creek Mine 37 February 25, 2016 <br />