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'eca M <br />JUL 6ZQ,1p <br />0 ing and Sa*y <br />July 14, 2010 <br />Jason Musick <br />Environmental Protection Specialist <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Twentymile Coal Company <br />29515 Routt County Road # 27 <br />Oak Creek, Colorado 80467 <br />(970) 879-3800 <br />RE: Repsonse to Twentymile Coal Company, 2009 Annual Hydrology Report Review <br />Mr. Musick: <br />The following responds to your review letter dated May 6, 2010 regarding the subject report. <br />1. Page 2, paragraph 3 has been updated to reflect that in 2009 flow from site 115 occurred from <br />May through August. <br />2. Page 11, paragraph 7 has been updated to reflect correct table and figure numbers for sites <br />SW-13, SW-14, and SW-15. Total recoverable iron units have also been corrected. <br />3. Subset tables (2a through 59a) are enclosed. Please remove table section from previous <br />submitted AHR, discard old set and and replace with the two complete sets enclosed. <br />Also enclosed are two copies of the stream gage report. Please insert in back tab of the previously <br />submitted AHRs. If you have any questions, please contact me directly at (970) 870-2750. <br />Sincerely, <br />C. <br />Brian A. Watterson, P.G. <br />Geologist, Environmental Group <br />Twentymile Coal Company <br />enclosures