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STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of Natural Resources <br />1313 Sherman St., Room 215 <br />Denver, Colorado 80203 <br />Phone: (3031 866-3567 <br />FAX: (303)83 L8106 ~¢„~, 9~a`~~~9 <br />Mr. Rick Mills <br />Twentymile Coal Company <br />29515 Routt County Road No. 27 <br />Oak Creek, CO 80467 <br />Re: Foidel Creek Mine, C-82-056, First Half 1999 Subsidence Report Review <br />Dear Mr. Mills: <br />DIVISION OF <br />MINERALS <br />Sc <br />GEOLOGY <br />RECLAMATION <br />MIN ING•SAf ETY <br />Bill Owens <br />Governor <br />Greg E. Walther <br />Executive Directs <br />Michael B. Long <br />Division Director <br />The Division has reviewed Twentymile Coal Company's First Half 1999 Subsidence Report for compliance <br />with permit C-82-056 and Rule 2.05.6(6). The methodology and procedures used in preparation of the report <br />appear appropriate and incompliance with the pemut requirements. The following comments are a result of <br />the Division's review: <br />A. Panel 5 Right subsided a portion of Middle Creek. No discussion of surface hydrology detail of Middle <br />Creek is included with this report. Please assure that this topic is discussed within Twentymile Coal <br />Company's 1999 Annual Hydrology Report. <br />B. The First Half 1999 subsidence tepOrt states that, "subsidence to the residential dwellings were as <br />predicted." In the Second Half 1999 Subsidence Report, please be sure to discuss in detail mitigation <br />measures taken by Twentymile Coal Company with regards to the two dwellings. <br />The following items require resolution from the Division's March 17, 1999 letter eeganiing the 1998 <br />Subsidence Reports: <br />1. The Division found several computation "busts" in the "Cum" data field in Table 1.Please review Table 1 <br />entries for Stations 111, 112 and 113. Please correct and resubmit Table 1. <br />2. Twentymile Coal Company did not provide surface hydrology detail regarding the four "sag-ponds" <br />formed in Foidel Creek . Is this infom~ation discussed in detail in Foidel Creek's Annual Hydrology <br />Report? If this is not included in the AHR, please include a discussion of the surface hydrology of the <br />ponding in the Subsidence reports. <br />Please provide responses to items no. 1 and 2, and assure that items A and B are discussed in the appropriate <br />reports. Please call should you have any questions. <br />Sincerely, ~ <br />Jane . B. ,~~ ~~ <br />En amen Protection Specialist <br />Cc: Dan Hernandez, DMG, Jim Pendleton, DMG <br />C Jj hb/C 82056/reports/99firsthalfdoc <br />