2014-01-30_REPORT - C1981019 (3)

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STATE OF COLORADO DIVISION OF RECLAMATION, MINING AND SAFETY Department of Natural Resources 1313 Sherman St., Room 215 Denver, Colorado 80203 Phone: (303) 866 -3567 FAX: (303) 832 -8106 January 30, 2014 Chris Gilbreath Colowyo Coal Company L.P. 100 West 116th Avenue Westminster, CO 80234 Re: Colowyo Coal Company, Permit No. C -81 -019 Review of 2012 Annual Hydrology Report (AHR) Dear Mr. Gilbreath: COLORADO ID IV I S I O N O F RECLAMATION MINING SAFETY John W. Hickenlooper Governor Mike King Executive Director Loretta E. Pineda Director I have reviewed Colowyo's responses to my review of your 2012 Annual Hydrology Report. No further responses from Colowyo are necessary. I look forward to the 2013 AHR (and other future AHRs) with the improvements that were discussed in this review process. In particular, I look forward to Colowyo's interpretation of the hydrologic data. One important aspect of the data interpretation is an analysis of trends (see DRMS Item 2). Related to the data trend discussions, I would like to address Colowyo's response to DRMS Item 7. It was not my intent for Colowyo to discontinue reporting all of the information in the tables in pages 2 -3 to 2 -7, only the trend information that is not backed by the statistical analysis. I recommend that you continue to include these tables, but trends that are not defensible with statistics (i.e., relatively low R2 values) should be removed or the word "increasing" (or "decreasing ") replaced with "uncertain" or something similar. Let me know if you have any comments and /or questions (ext. 8113, rob.zuber @state.co.us). Sincerely, a/-� --,-7 Z,4, Robert D. Zuber, P.E. Environmental Protection Specialist Office of Office of Mined Land Reclamation Denver • Grand Junction • Durango Active and Inactive Mines