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IIII Peabodq <br />Twentymile Coal, LLC <br />February 2, 2015 <br />J arod Ebert <br />29515 Routt County Road 27 <br />OaK CreeK. CO 80467 <br />970.879.3800 <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining, and Safety (CDRMS ) <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 (303) 866 -3567 X8120 <br />RE: Moffat County Mining, LLC — Williams Fork Mine, Response to CDRMS comments on <br />2013 Annual Hydrology Report (AHR) <br />Mr. Ebert: <br />Twentymile Coal, LLC (TC) is in receipt of your comment letter dated October 27, 2014. This letter <br />addresses your three comments. <br />Item L Apparently our hydro database did not propagate all the data parameters for our water wells. <br />have attached new tables which provide this information. I apologize for the oversight. <br />Item 2. Water level measurements for wells 83 -01, 83 -02, 83 -03 and 84 -01 for the first quarter of <br />2013 is attached. <br />Item 3. This relates to monitoring flow for surface water sites WF -1 and WF -2 on the Williams fork. <br />Exhibit 29 calls for monitoring upstream and downstream of these two sites. These sites are located <br />upstream and downstream of NPDES dewatering site 5D, which has not discharged since June of <br />2013, and is now inoperable. Thus, monitoring flow upstream and downstream of this site is now <br />pointless. MCM did provide daily average flows for the Williams fork River from the Colorado State <br />Water Resources (DWR) monitoring station downstream (by the white bridge) of the mine property for <br />2013. 1 spoke with DWR and they clarified that there is no active upstream flow station operated by <br />the State. MCM has no way of obtaining an accurate flow upstream on the river. l'm no clear what <br />Exhibit 29 had originally intended for measuring two flows. 1 will be working on a revision to clarify <br />what flow data MCM will provide in the future. <br />If you have any other questions regarding my responses, please contact me directly at: (970) 870- <br />27'501. <br />Best Regards, <br />for Moffat ounty Mining, LLC <br />Brian A. Watterson <br />Geologist <br />Environmental Group <br />Twentymile Coal, LLC <br />