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Ryan Pawlowski <br />Colowyo Coal Company <br />5731 State Highway 13 <br />Meeker, CO 81641 <br />23 September 2010 <br />Mr. James R. Stark <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining and Safety <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RECEIVE[ <br />SEP 2 7?010 <br />Division Qt RecianvIon, <br />Mining and Safety <br />RE: Technical Revision No. 87, East Pit Sediment Control Structures and Spoil <br />Grading Map Update, Colowyo Coal Mine, Permit No. C-1981-019. <br />Dear Mr. Stark, <br />Enclosed please find two copies of additional materials provided for Technical Revision No. <br />87. <br />As noted on the index sheet in bold; only the selected materials are provided. These <br />materials supplement previously submitted materials provided on 3 September 2010 and on <br />10 August 2010. The enclosed materials are a result of the map changes associated with <br />the revised alignment of the lower portion of the North Tributary, East Pit Ditch as agreed <br />up on during the telephone meeting between members of the Division and Colowyo on 16 <br />September 2010. <br />Should you have any questions or require additional information, please feel free to contact <br />me directly at (970) 824-1578. <br />Sincerely, <br />Ryan Pawlowski <br />Environmental Engineer <br />Encl. 2 copies <br />Cc: file CF 1.1.2.76 <br />Colowyo Coal Company, L.P. • 5731 State Highway 13 • Meeker, CO 81641 <br />T + 1 970 824 1578 • F +1 970 824 1598 • http://prospect.riotinto.org/irj/portal