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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 />November 4, 2011 <br />Tony Tennyson, Environmental Engineer <br />Colowyo Coal Company <br />5731 State Highway 13 <br />Meeker, CO 81641 <br />Re: Colowyo Coal Company, Permit No. C -81 -019, 2010 Annual Hydrology Report <br />Dear Mr. Tennyson: <br />I reviewed the responses from Colowyo Coal Company (letter from you dated June 9, 2011). The <br />responses addressed my issues that were in our review letter of May 27, 2011. Thank you for the <br />response. <br />I strongly recommend that Colowyo Coal Company provide the following in future AHRs: <br />• Explain your surveys of sediment ponds. Are they actual surveys (using GPS or traditional <br />survey equipment), or are they estimates of pond capacities determined in some other way? If <br />it is the latter, please explain the method in the AHR and avoid using the word "survey" to <br />describe the activity. <br />• Explain gaps in data, including exhibits that have no data for certain drainages because of no <br />flow. <br />Let me know if you have any comments and /or questions. My phone number is 303.866.3567, <br />extension 8113. <br />Sincerely, <br />Rob Zuber, P.E. <br />Environmental Protection Specialist <br />STATE OF COLORADO <br />COLORADO <br />D I V I S I O N O F <br />RECLAMATION. <br />MINING <br />— &— <br />SAFETY <br />John W. Hickenlooper <br />Govemor <br />Mike King <br />Executive Director <br />Loretta E. Pineda <br />Director <br />Office of Office of <br />Mined Land Reclamation <br />Denver • Grand Junction • Durango Active and Inactive Mines <br />