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Twentymile Coal, LLC. <br />Page 3 <br />July 21, 2015 <br />panels 6-9 (which correspond to WC-4RT to IRT) or panels 10 through 13 (which correspond to <br />panels WC-11RT to 14RT). Given this, it does not appear TC has obtained MSHA approval to <br />retreat mine in WC-9RT panel as proposed. Please either provide a plan for dewatering and <br />handling the pooled mine water in the Wadge Seam to accommodate longwall mining in the WC- <br />9RT panel or modify the mine plan so mining will not occur in this area. If the first option is <br />chosen, please provide documentation that MSHA has approved retreat mining in WC-9RT panel. <br />a. TC's response: The accumulated mine water in the Wadge workings (northern pool) <br />extends slightly into the WC -I IRT panel (refer to the revised Map 23WC accompanying <br />these responses). Even considering angle of draw effects, the proposed mining in the <br />WC-9RT panel would not affect this area of mine water accumulation. <br />b. Division's response: Item resolved. <br />6. Exhibit 53 currently includes Confidential Wolf Creek Reserve, Geologic and Mine Plan <br />Information submitted with TR83. PR10 includes two documents, one an MSHA letter dated <br />December 31, 2014 with supplemental materials, the second is a letter from Peabody Energy <br />dated April 14, 2014 regarding an application for a coal lease by modification. Instruction on <br />where or how these documents will be included in the currently existing Exhibit 53 was not <br />included with the PR10 submittal. Also, it may be more appropriate to include the application for <br />a coal lease modification in Exhibit 2 of the permit instead of Exhibit 53. Please indicate how <br />these documents should be incorporated into the exhibits and paginated. <br />a. TC's response: The two items referenced do not need to be included in the PAP, are <br />provided as supporting information only, and can most appropriately be included in the <br />CDRMS permit correspondence file. <br />b. Division's response: Item resolved. The Division will scan these documents into the <br />PR10 file on our electronic imaging system. <br />Rule 2.05.2; Operation Plan — Estimate Area for Life of Operations <br />7. PR10 included a revised Map 23; Wolf Creek PR14-10, Mine Plan Modification. Currently, the <br />permit includes four maps: Map 23 — Mine Plan, Map 23a - 5 -Year Mine Plan with Subsidence <br />Monitoring Plan, Map 23b — Structures and Renewable Resources, and Map 23c- Mine Plan, <br />Surface Disturbance and Monitoring. Will the submitted map replace any of the currently <br />approved maps? If so, please indicate which map of the series it will replace and submit a revised <br />copy with the appropriate identification designation. <br />a. TC's response: Since PR10 addresses mining in the Wolf Creek Seam, we have re- <br />designated the corresponding Mine Plan Map as Map 23WC. Revised copies of this map <br />accompany these responses for placement in the PAP. <br />b. Division response: Item resolved. <br />8. Revised page 2.05-3.1 indicates the subsidence monitoring network for the longwall area is <br />shown on Map 23a. The Division could not locate Map 23a within the permit application <br />package. Please submit an updated Map 23a. <br />