2013-10-17_PERMIT FILE - C1982056A (4)

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E] (development mining) and the second the amount of cover. No monitoring of this powerline is warranted at this time. Railroad The Union Pacific Railroad spur traverses over panels 12 Right through 16 Right and their associated gateroad of the proposed five -year permit (1998 - 2003). The overburden thickness varies from 1000 to 1,100 feet in the corridor where the railroad passes over the mine workings. The location of the ,rail line is shown on Map 23B, Structures and Renewable Resources The worst -case impacts due to subsiding the railroad track could result in a train derailment. In the unlikely event that this should occur, the coal spilled from the cars would be cleaned up to the extent practical. The coal would be either returned to the car or hauled back to Twentymile's facility. In the event this occurred during an inclement period and ground conditions did not allow for the clean up, the coal will be cleaned up during the next favorable period. Twentymile does not plan to construct any permanent roads to facilitate the clean-up process. The mobile equipment (i.e. trucks and loaders) will drive over the tracks or immediately adjacent to the track bed. The potential clean up will be limited to periods of good field conditions, thereby reducing the chance that a road will have to be zonstructed into the clean-up site. A copy of the subsidence agreement between TCC and the railroad is incorporated into Exhibit 7D -1. Any additional agreement letters from different parties will also be incorporated into this exhibit (7D -1)." In addition to the railroad track there is a powerline that services one track relay overlying panel 14 Right. In the event that the powerline were damaged the relay has a backup power source. This would not result in any disruption in service. If the powerline were damaged it would be repaired and service established to the site. During the mining of the 9, 8 and 7 Right panels, the railroad track was subsided without causing any derailments or other material damage. The track subsided as predicted and the agreed upon repair /maintenance plan was carried out without any significant problems. The track will be subsided during the mining of panels 12 Right through 16 Right. It is anticipated that no problems will result from this mining given the knowledge and experiences gained during the exercising of the repair plan. TCC will continue to gain knowledge and experience as mining progresses throughout the remainder of the impacted Eastern Mining District panels and then in the Northern Mining District. Foidel Creek Foidel Creek flows in a northeasterly direction through the Northern Mining Districts. Foidel Creek flows across the east end of Panel 12 Right and exiting near the extreme north -east comer of Panel 12 Right. The location of the creek is shown on Map 23. The overburden thickness varies from-600 to 800 feet in the corridor where the creek passes over the mine workings. The projected impacts to the creek are presented in Exhibit 4e -3, Northern Mining District Subsidence Prediction, and in the Probable Hydrologic Consequences of this application. As noted in MR 02 -179 2.05 -181.6 %/06/02