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<br /> <br />Subsidence Handbook Volume III, Exhibit 15 <br />Introduction <br />TRANSMISSION LINE AND TRANSMISSION TOWERS <br />The Western Area Power Administration Curecanti-Rifle transmission line and transmission <br />towers are located west of Terror Creek. <br />Worst-Case Damage <br />Tilt of the ground surface caused by subsidence could affect the transmission towers and <br />thus affect the integrity of this important transmission line. If the ground slope is such that <br />after tilting the center of gravity of the tilted structure falls outside of the base area, it will <br />topple but that is not likely. <br />Pre-Damage Monitoring <br />No pre-damage monitoring will be performed. The Applicant will assume the transmission <br />line towers were constructed with no tilt and the transmission line towers have virtually zero <br />tilt after settling. <br />Post-Damage Monitoring <br />Post-Damage monitoring would involve surveying the level of the transmission tower <br />footings to determine the tilt angle of the transmission line towers. <br />Mining Techniques <br />Mining near or under transmission line towers will be limited so no subsidence will occur. <br />Repair Procedures <br />Shims would be placed under the tower legs to eliminate the tilt of the transmission <br />towers. <br />TR-65 <br />46 <br />02/10