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NNID (Panels 17 Right through 2~Right) (PR 03-06) • Mining will continue to the north in the NMD; this will result in subsiding Fish Creek and its alluvial valley floor, vazious stock ponds, Twentymile Sandstone, powerlines (located over 19 Right), and the Union Pacific Railroad Track. Each will be discussed below. Land Use Pastureland and rangeland are the predominant land uses in this remaining section of the Northern Mining District. The land use patterns are presented in Map 3, Premining Land Use. Existin¢ Structures Aquifers The Twentymile Sandstone outcrops along sections of the Foidel and Middle Creek drainages. The Twentymile Sandstone is a large regional aquifer located throughout northwest Colorado. There are no known water supply wells completed in the Twentymile Sandstone in the vicinity of the mine. Powerline The powerlines that aze located to the north of the 18 Right Gateroad and within the 19 Right panel will be subsided during mining in this section of the Northern Mining District The powerline is adjacent to the gateroad, however, TCC's extensive mining experience indicates that the powerline will not be impacted negatively. The subsidence report for the powerlines is presented in Exhibit 7e-7. • Railroad The Union Pacific Railroad spur traverses over panels 17 Right and 18 Right and their associated gateroad of the proposed five-year permit (2003- 2007). The overburden thickness varies from 1100 to 1,200 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 constructed 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)." There are two locations where the track crosses Fish Creek which will require placement of additional fill at these crossings. It is anticipated that cleanup materials from the UP's normal track maintenance activities. This work will be coordinated through the UP. During the mining of the 9, 8, 7, 12, 13 and 14 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 17 • Right and 18 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 PR 03-06 2.05-181.9 05/07/03