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XIV. Protection of Underground Mining <br />No specific approvals are granted to the applicant under this section. <br />XV. Subsidence Control <br />The applicant has predicted that no material damage will result from subsidence, other <br />than the possibility of mining in the Western Mining District drying up two springs <br />that have adjudicated water rights, the Gertie No. 1 and Livestock No. 2 springs. <br />Numerous structures exist above previously approved mining areas. The applicant has <br />presented a subsidence control plan to repair or mitigate damage caused by subsidence <br />for each of the existing structures. Details regarding the subsidence control plan may <br />be found in the approved PAP. A brief summary of the subsidence control measures <br />for each structure follows. <br />County Road No. 33 <br />Mining conducted in the Eastern Mining District (EMD) and longwall panel 12 in the <br />Northern Mining District (NMD) undermined portions of Routt County Road No. 33. <br />TC conducted daily monitoring of the road when the longwall panels were <br />approaching and undermining the road. When surface observations found the asphalt <br />road surface had buckled or been damaged due to subsidence, TC temporarily repaired <br />the surface using gravel. Once subsidence monitoring indicated that subsidence had <br />ceased, permanent asphalt overlay or patch was applied to the damaged road section. <br />This method was successfully used during the mining of Longwall panels 9R, 8R, 7R, <br />6R and 5R in the Eastern Mining District, and Longwall panel 12R in the Northern <br />Mining District. Twentymile Coal re -paved segments of Routt County Road No. 33 in <br />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 />Foidel Creek Mine 34 August 10, 2018 <br />