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Tay Tonoui <br />Sr. Environmental Engineer/ <br />Land Manager <br />PH: (970) 824-1579 <br />Fax: (970)824-1598 <br />Mr. James R. Stark <br />Environmental Protection Specialist <br />Colorado Division of Minerals and Geology <br />Department of Natural Resources <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />R~~ ~-#~ rip <br />... <br />ftd lOZUU1 <br />Divis. ~~ ~, . <br />~amauon, <br />Mnimy end da(ety <br />February 16, 2007 <br />RE: Technical Revision No. 63, Revision to Postmining Topography Colowyo Coal Mine, Permit <br />No. C-81-019. <br />Dear Mr. Stazk, <br />Enclosed please find three copies of materials provided to finish Technical Revision No. 63. Specifically, <br />this includes responses to Comments 16 through 20. Also enclosed is a tracking sheet for this submittal. <br />If you have any questions or just require additional information, please don't hesitate in contacting me at the <br />phone number above. <br />Sincere/ <br />Senior Environmental Engineer <br />Encl. 3 copies <br />Cc: file CF 1.1.2.52 2007 w\encl <br />Colowyo Mine • 5731 State Highway 13 • Meeker, Colorado 81641 <br />T+1 970 824 1500 • F +I 970 824 1504 • www.r[ea.com <br />