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TWENTYMILE COAL, LLC - FOIDEL CREEK MINE (C82-056) <br />PR15-11 WOLF CREEK DEVELOPMENT AND MINING <br />TECHNICAL ADEQUACY REVIEW II - RESPONSES 02/15 <br />Section 2.06.8 — Alluvial Valley Floors <br />10. Revised Page 2.06-25.9 indicates that water quality is monitored at Station 900 on Foidel Creek <br />downstream of previous mining in the Eastern Mining District and the proposed mining in the WCR. <br />This station appears to be located within the 4RT longwall panel within the WCR, not downstream. <br />Please revise this page to indicate this and please establish a new downstream monitoring point <br />along Foidel Creek above the confluence of Middle Creek (See item below). <br />a. TC's response: Potential subsidence -related impacts on Site 900 Would not occur for a <br />nutiiber of years. In the interim, this site will continue to be monitored. At least a near prior <br />to potential mining impacts, this site will be moved to a downstream location and will be <br />monitored during andfollo1wing active mining in the area. The revised page addressing this <br />change accompanies these responses for replacement in the PAP. <br />b. Division's response: Overall, this item is resolved. However, please submit a revised Nlap <br />13.1 that depicts the monitoring points discussed in the revised plan. Also, it was noted than <br />two new Bedrock wells (WC -008B and WC -013A) were added to the hydrologic monitoring <br />plan on Tuble I of Exhibit 14. Please add these wells to Map 13A. <br />Response: Map 13A has been reviewed and updated to reflect the new monitoring locations. Copies <br />of the revised map accompany these responses for replacement in the PAP. <br />New Adequacy Review Items <br />Since the original submittal and subsequent review of the PRI 1 application, TC has submitted and received <br />approval for several revisions to the permit. Given this, some of the section's and pages proposed to be <br />revised with PRI I need to be updated to account for the approval of these revisions. Please address the <br />following textual issues: <br />Permit Section 2.04.4 <br />I Section 2.04.4, pages 2.04-9.1 and 2.04-9.2 of the permit has been revised with MR289. The section <br />titled WCR Development, Mining, and Related Facilities, does not include information that was <br />revised with MR289. Please revise this section to include the citing of MR289 in the section title. Also <br />it appears parts of Section 10 of TSN, R86W were surveyed for cultural resources. Please indicate this <br />section was part o the survey <br />Response: The referenced text has been reviewed and revised to include the approved MR289 updates <br />and to note the additional cultural resource survey coverage. Copies of the revised text pages <br />accompany these responses for replacement in the PAP. <br />2. A new section i,vas added to section 2.01.4 of the permit for the 13LT Outby Utility Borehole. MR29' <br />approved a cultural resources survey plan for a borehole that has been proposed with MR291. At the <br />writing of this letter MR291 is still under review. Please update page 2.04-9.2 to include the currently <br />approved section for the 13L Oittby Utility Borehole that was approved with MR292. <br />Response: The referenced text has been reviewed and revised to include the approved MR291 and <br />292 updates. Copies of the revised text pages accompany these responses for replacement in the PAP. <br />