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STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman S[., Room 215 <br />Denver, Colorado 80203 <br />Phone: (303) 866-3567 <br />FAX: (303) 832-8106 <br />December 15, 2004 <br />Jerry M. Nettleton <br />Environmental Coordinator <br />Twentymile Coal Company <br />29515 Routt County Road #27 <br />Oak Creek, CO 80467 <br />Re: Foidel Creek Mine, Permit C-1982-056, ]s` Half 2004 Subsidence Report <br />Dear Mr. Nettleton: <br />The Division of Minerals and Geology (Division) has completed its review of your <br />revised subject report (letter of September 13, 2004 and e-mail of December 13, 2004). A <br />copy of the review is attached. <br />Overall, actual subsidence relates closely to that predicted. The maximum subsidence <br />appears to be as much as 15% more than predicted, and the profile of subsidence are <br />offset to the north about 200 feet. Please consider this trend for predictions of the impacts <br />of subsidence under structures to the north. <br />Please call me if you have any questions. <br />Yours truly, <br />~ ~ w~~ <br />Byrofi G. Walker <br />Environmental Protection Specialist <br />1 Enclosure, as stated <br />cc: Daniel I. Hernandez, Division <br />COLORADO <br />DIVISION O F <br />MIN&RALS <br />GEOLOGY <br />REC LA MATIO N•MINING <br />SAFETY•SU ENCE <br />BIII Owens <br />Governor <br />Russell George <br />Executive Director <br />Ronald W. Cattany <br />Division Director <br />Natural Resource Trustee <br />Office of <br />Mined Land Reclamation <br />Office of <br />Colorado <br />Geological Survey <br />Active and Inactive Mines <br />