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Hernandez, Alysha <br />From: Zuber, Rob <br />Sent: Thursday, November 03, 2011 2:34 PM <br />To: Binns, Janet; Hernandez, Alysha <br />Subject: Colowyo 2010 AHR review <br />Janet — <br />I reviewed the responses from Colowyo Coal Company (letter from Tony Tennyson dated June 9, 2011). They have <br />addressed my issues that were in our review letter of May 27, 2011. <br />I recommend that we request the following in future AHRs: <br />Explain the surveys of sediment ponds. Are they actual surveys or estimates of pond capacities determined in <br />some other way? If it is the latter, they should explain their method, and the word "survey' should not be used <br />to describe the activity. <br />• Explain gaps in data, including exhibits that have no data for a certain drainage because of no flow. <br />Let me know if you have any comments and /or questions. <br />Rob <br />Rob Zuber, P.E. <br />Environmental Protection Specialist <br />Colorado Department of Natural Resources <br />Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />Phone: 303.866.3567 x8113 <br />