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Twentymile Coal, LLC. <br />Page 2 <br />December 8, 2015 <br />and structures to be monitored within the permit and adjacent area. Revised pages 2.05-19IJ <br />and 191.9 indicate that TC will monitor monuments along RCR33 and the Railroad. TC <br />updated Map WC23 for PR10 to include more details about subsidence monitoring points for <br />RCR33, the Railroad and the Powerlines in the legend area. For PRI 1, please revise Map <br />WC23 to add this information. <br />a. Resolved <br />In the NW I/4 of Section 13, T5N R86 West, a very steep slope with potential rock outcrops is <br />located above RCR33. The Division agrees that placing signs at the entrance of County Road <br />33 into the subsidence area would be a good practice. Also, the Division requests that visual <br />monitoring of the area in question be conducted during the time periods TC will be monitoring <br />County Road 33 for subsidence. Please revise the subsidence monitoring plan submitted for <br />County Road 33 to include conducting visual monitoring of this area and a discussion of what <br />actions will be taken should unstable conditions and rockfall be observed. <br />a. Resolved <br />TC updated the subsidence monitoring program discussed on pages 2.05-191.8 to 191.10 with <br />PRI 0 with the August 12, 2015 submittal. For the Powerline, TC indicated monitoring will be <br />conducted daily with the PRI l submittal, and weekly for PRI 0. For the railroad, TC did not <br />specify where the monitoring points will be located on page 191.9 as is discussed on this page <br />with the August 12, 2015 submittal for PR10. Also for the railroad, TC indicated monitoring <br />will be conducted daily with PRI I and weekly with PR10. Please revise these pages as <br />necessary for consistency. <br />a. Resolved. <br />Section 2.06.8 — Alluvial Valley Floors <br />7. Revised page 2.06-25.7 references two reports in Exhibit 7e-2 and 7e4. The Division <br />believes TC meant to reference Exhibit 4e-2 and 4e4. Please revise this page accordingly. <br />a. Resolved. <br />Revised page 2.06-25.8 indicates that TC conducted a vegetation study on the Fish Creek <br />AVF; this study is located in Exhibit 7J-1 of the permit. This page indicates that productivity <br />between the AVF bottomlands and uplands are not significantly different. However, upon <br />review of Exhibit 7J-1, the data indicates the production from the valley floor is about twice <br />that of the upland area. Given this, the statement made on Page 2.06-25.8 does not appear to <br />be correct. Please revise this page and evaluate if the conclusion drawn is still accurate. <br />a. Resolved <br />9. Revised Page 2.06-25.9 indicates that there are areas where sub -irrigation occurs within the <br />AVF. Map 5 of Exhibit 4e depicts areas where sub -irrigation occurs along Fish Creek. Please <br />evaluate the impact mining in the WCR will have on these areas that are sub -irrigated and to <br />