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must remain level to function correctly. Given the anticipated subsidence projected for the panel it was determined <br />that moving the switch prior to mining 9Right would prevent any problems with the switch. <br />After subsidence was completed the structures were inspected to determine if any additional repair work would be <br />needed to return them to their pre -mine condition. This work was required as a result of TCC's mining activities. <br />Generally, TCC did not expect that the wooden lines, both H- structures and single pole, would be materially <br />damaged as a result of undermining and subsiding them. TCC has generated site specific data for these powerlines <br />through its mining in the Southwest Mining District. In the Southwest Mining District, both types of powerlines <br />were undermined and subsided with no significant impact to the lines or structures. This results of TCC's <br />monitoring of this structure has been presented in TCC's semi - annual subsidence reports and in Exhibit 7g. <br />EMD (PANELS 2 RIGHT THROUGH 6 RIGHT) (PR 97 -04) <br />Subsidence Control Plan <br />The proposed mining in the EMD should not result in the material damage or diminution of reasonably foreseeable <br />use of structures or resources in the five -year mine plan. The structures within the five -year mine plan area include <br />County Road 33, powerlines (Public Service, Tri- State, Western Area Power Administration, Platte River Power <br />Authority, and Yampa Valley Electric Association), telephone line (U.S. West), Twentymile Sandstone, Foidel, and <br />Middle Creeks. <br />County Road 33 <br />In reference to County Road 33, Twentymile has gained recent experience with undermining and subsiding both <br />County Road 27 and County Road 33. The experience indicates that either tensional or compressional fractures <br />may be manifested in the road surface. This results in either cracking or buckling of the road surface. In either <br />case, gravel is brought in to provide a temporary repair to the roads' surfaces. The permanent repair program, <br />asphalt patches or overlay, insures that material damage or diminution of reasonably foreseeable use of the road <br />does not occur. <br />Hayden -Gore Pass Line <br />In looking at the Hayden -Gore Pass line, two component of material damage have to accessed, those being: 1) <br />promptly restoring power, and 2) maintaining the structures. Prior to subsidence, the metal towers and their <br />Permit Renewal No. 3 2.05 -197 4/l/99 <br />