2015-07-21_REVISION - C1982056 (2)

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Twentymile Coal, LLC. Page 7 July 21, 2015 2.05.6(6)(a)(ii) requires that an appropriate map, prepared in accordance with Rule 2.10 showing the location and configuration of the structures and renewable resources lands within the permit and adjacent area, be submitted. The definition of "renewable resource lands" is found at Rule 1.04(110). Please submit a map that depicts the renewable resource lands within the permit area and adjacent area, the Scott Farmstead, the Telephone Lines and Irrigation Ditches. a. TC's response: Map WC23B currently shows the County Road, railroad spur, potentially affected powerline, and identifies land use areas, and ponds, ditches and springs. Detailed delineation of land use areas is provided by Maps 3 and 3A (shading or hatching these areas on this map would make the map un -readable). The Scott Farmstead (long abandoned and now owned by TC) is further to the west and does not fall within the mapping area for Maps WC -23 and WC -2313. b. Division's response: This item is resolved. 18. PR10 included Exhibit 7K; Wolf Creek Reserve Subsidence Evaluation. Drawing 2 of Exhibit 7K depicts the layout of the Wolf Creek Seam Panels. These seam panels do not correspond to the mine plan submitted and depicted on revised Map 23. Given this, it appears the evaluation was based on a different mining plan. Please submit a new subsidence evaluation based on the updated mine plan. a. TC's response: The revised and updated subsidence evaluation and associated text revisions provided as a supplemental submittal on March 19, 2015 address this Comment. b. Division's response: Item resolved. 19. Rout County Road 33 was not included in the subsidence evaluation submitted with Exhibit 7K. Given this, it is unclear what the worst possible subsidence consequences will be. Please evaluate the worst possible subsidence consequences of mining in the Wolf Creek seam based on the mine plan submitted with PR10. Please indicate if the worst possible subsidence consequences will result in material damage or diminution of reasonably foreseeable use of RCR33. If so, please submit the information required by Rule 2.05.6(6)(b)(ii). a. TC's response: The revised and updated subsidence evaluation and associated text revisions provided as a supplemental submittal on March 19, 2015 address this Comment. b. Division's response: Item resolved. 20. Revised Page 2.05-181.12 indicates two powerlines may be impacted by subsidence from mining in the Wolf Creek Reserve. One line is described as being located north of the 18RT gate road and within the 19RT Panel (NMD). The other powerline is the Yampa Valley Electric Line. Exhibit 7K evaluated subsidence impacts on three lines, the Archer -Hayden Powerline, Craig - Hayden -Steamboat Powerline and the Foidel Creek -Steamboat Powerline. Please re-evaluate which powerlines will be impacted by the proposed operation and update the Exhibit 7K and permit text accordingly. Please use the same nomenclature when discussing the different powerlines. Please label the powerlines on the revised map 23. a. TC's response: The revised and updated subsidence evaluation and associated text revisions provided as a supplemental submittal on March 19, 2015 address this Comment.