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(development mining) and [he second the amount of cover. No monitoring of this powerline is warranted at this <br />time. <br />Railroad <br />The Union Pacific Railroad spur traverses over panels ] 2 Right through 16 Right and their associated gateroad of the <br />proposed five-year permit (1998-2003). The overburden thickness varies from_ 1000 to 1,100 feet in the corridor <br />where the railroad passes over the mine workings. The location of the rail line is shown on Map 23B, Structures and <br />Renewable Resources <br />The worst-case impacts due to subsiding [he railroad track could result in a train derailment. In the unlikely event <br />that this should occur, the coal spilled from the cars would be cleaned up to the extent practical. The coal would be <br />either returned to the car or hauled back to Twentymile's facility. In the event this occurred during an inclement <br />period and ground conditions did not allow for the clean up, the coal will be cleaned up during the next favorable <br />period. Twentymile does not plan to construct any permanent roads to facilitate the clean-up process. The mobile <br />equipment (i.e. trucks and loaders) will drive over the tracks or immediately adjacent to the track bed. The <br />potential clean up will be limited to periods of good field conditions, thereby reducing the chance that a road will <br />have to be constructed into the clean-up site. A copy of the subsidence agreement between TCC and the railroad is <br />incorporated into Exhibit 7D-l. Any additional agreement letters from different parties will also be incorporated <br />into [his exhibit (7D-1)." <br />During the mining of the 9, 8 and 7 Right panels, the railroad track was subsided without causing any derailments <br />or other material damage. The track subsided as predicted and the agreed upon repair/maintenance plan was carried <br />out without any significant problems. The track will be subsided during the mining of panels 12 Right through ] 6 <br />Right. It is anticipated that no problems will result from this mining given the knowledge and experiences gained <br />during the exercising of the repair plan. TCC will continue to gain knowledge and experience as mining progresses <br />throughout the remainder of the impacted Eastern Mining District panels and then in the Northern Mining District. <br />Foidel Creek <br />Foidel Creek flows in a northeasterly direction through the Northern Mining Districts. Foidel Creek flows across <br />the east end of Panel 12 Right and exiting near the extreme north-east corner of Panel 12 Right. The location of the <br />creek is shown on Map 23. The overburden thickness varies from 600 to 800 feet in the c ~idoF where the creek <br />passes over the mine workings. The projected impacts to the creek are presented in Exhibi 4t~e-3 Northern Mining <br />District Subsidence Prediction, and in the Probable Hydrologic Consequences of this application. As noted in <br />(\ <br />APPROVED JUN 2 fl 2000 <br />PR 99-OS 2.05-181.6 3/28100 <br />