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STATE OF COLORADO <br />DIVISION OF RECLAMATION, MINING AND SAFETY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866 -3567 <br />FAX: (303) 832 -8106 <br />February 12, 2014 <br />Chris Gilbreath <br />Water, Waste and Mining Compliance Manager <br />Tri -State Generation and Transmission Association <br />1100 West 116th Avenue <br />Westminster, CO 80234 <br />Re: Colowyo Coal Company, Permit No. C -81 -019 <br />Review of 2012 Annual Hydrology Report (AHR) <br />Dear Mr. Gilbreath: <br />COLORADO <br />ID IV I S I O N O F <br />RECLAMATION <br />MINING <br />SAFETY <br />John W. Hickenlooper <br />Governor <br />Mike King <br />Executive Director <br />Loretta E. Pineda <br />Director <br />I have reviewed Colowyo's responses to my review of your 2012 Annual Hydrology Report. <br />No further responses from Colowyo are necessary. I look forward to the 2013 AHR (and <br />other future AHRs) with the improvements that were discussed in this review process. In <br />particular, I look forward to Colowyo's interpretation of the hydrologic data. <br />One important aspect of the data interpretation is an analysis of trends (see DRMS Item 2). <br />Related to the data trend discussions, I would like to address Colowyo's response to DRMS <br />Item 7. It was not my intent for Colowyo to discontinue reporting all of the information in <br />the tables in pages 2 -3 to 2 -7, only the trend information that is not backed by the statistical <br />analysis. I recommend that you continue to include these tables, but trends that are not <br />defensible with statistics (i.e., relatively low R2 values) should be removed or the word <br />"increasing" (or "decreasing ") replaced with "uncertain" or something similar. <br />Let me know if you have any comments and /or questions (ext. 8113, rob.zuber @state.co.us). <br />Sincerely, <br />Robert D. Zuber, P.E. <br />Environmental Protection Specialist <br />Office of Office of <br />Mined Land Reclamation Denver • Grand Junction • Durango Active and Inactive Mines <br />