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thereby, were not not affected. The bamer pillars below the AVF have been designed to prevent subsidence effects <br />• to these structures from worst case predictions. <br />Roads <br />Several dirt roads pass over the azea to be mined with secondary extraction. These dirt roads are only used by local <br />ranchers or surface owners. It is not anticipated that any potential worst case subsidence effects would result in <br />significant damage to this type of road. <br />The MLRD, through Stipulation No. 7, found in "The Foidel Creek Mine, Life of Mine Permit Revision, C-056- <br />82, Proposed Decision and Finding of Compliance," required Twentymile Coal Company to develop a plan to <br />control road access for those dirt roads found within the projected area of subsidence. The following served to <br />satisfy the requirements of Stipulation No. 7. <br />TCC controlled access of the roads which are located within the area of subsidence by maintaining a locked gate <br />across the entrance of those roads. Also, a "NO TRESPASSING" sign was placed near the gate entrance. This <br />provided control for the five-year period of 1988 - 1993, and access control will be modified in subsequent yeazs to <br />maintain this level of control for the life of the mine, if experience shows this level of control is required. <br />Couutv Road No. 27 <br />The main entries of the Foidel Creek Mine were designed to prevent subsidence in the area of County Road No. 27. <br />Mining had no impact on this segment of the county road. <br />D. & R. G. W. Railroad Sour <br />• The main entries of the Foidel Creek Mine were designed to prevent subsidence under the Union Pacific railroad <br />spur. Therefore, the underground mining activities had no impact on the raiUoad spur. <br />Yampa Vallev Electric Association 69 KV Powcrlime <br />The main entries of the Foidel Creek Mine were designed to prevent subsidence under this 69 KV powerline. The <br />five-year mine plan (1988 - 1993) calls for driveage of main entries under powerlines traversing through <br />Twentymile Park. Prior to the time that production panels were scheduled to undermine any powerlines, a <br />Subsidence Monitoring and/or Subsidence Control Plan was presented to the DMG for approval. <br />Ground Water Hydroloev <br />As explained in Section 2.05.6(3), only a minor impact was created on the overburden aquifer found above the <br />Wadge Seam. Worst case subsidence had the general effect of creating secondary permeability with the potential <br />for some leaching. The impacts were localized and did not affect any water uses or water rights in the area. <br />Coal Seams <br />The planned operation from the Foidel Creek Mine involved the recovery of coal from the Wadge seam. <br />Examination of drill hole logs from Exhibit 12, Lithologic core Logs, and from general stratigraphy data set forth in <br />Section 2.04.6 of this application indicate the presence of two coal seams above the Wadge Seam: the Lennox <br />Seam and the Fish Creek Seam. The Lennox Seam is extremely lenticular and discontinuous in this area and <br />generally less than two (2) feet in thickness. Underground mining of the Lennox Seam is impractical, both <br />r 1 <br />U <br />APPRU~/ED APR 2 4 2000 <br />Permit Renewal No. 3 2.05-174 1 I/I/99 <br />