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iii iiiiiiiiniii iii <br />DIVISION OF MINERALS AND GEOLOGY <br />Department of N, rural Resouaes <br />1311 Sherman 51., Room 215 <br />Denver. Colorado 80103 <br />Phone: 1.}114! 866-3567 <br />FAX. 1103V 831-Bf Ob <br />December 10, 1997 <br />Tracy Auwaerter <br />Environmental Secretary <br />Twentymile Coal Company <br />29515 Routt Counry Road No. 27 <br />Oak Creek, CO 80467 <br />Re: Foidel Creek Mine, MR154, Copies of SEDCAD Demonstrations. <br />Ms. Auwaerter: <br />II~~~ <br />DEPARTMENT OF <br />NATURAL <br />RESOURCES <br />Roy Rom¢r <br />Governor <br />lames S Lochhead <br />E.eculive Direcor <br />Michael B. tong <br />Divis,nn Director <br />In response to our telephone discussion on Monday December 8, 1997, the Division is forwarding a copy <br />of the SEDCAD demonstrations referenced in the Division's MRl ~4 adequacy letter (dated I I/ 7/97). <br />This was identified as item No. 13 in the November 7, 1997 letter. <br />13. In the Division's permit copy SEDCAD demonstrations for the "South Topsoil Pile Peak Flow", <br />North Topsoil Pile Peak Flow", "Vent Pad Peak Flow", "Pump Area Peak Flow", "Sandstones <br />Substation", "Wastewater Treatment Facility Culvert Sizing", and the "Perry Property" have been <br />place between PNS pages 2.05-28(f) and 2.05-29. Please advise the Division as to the placement <br />of these SEDCAD demonstrations. <br />Please call should you have additional questions. <br />Sincerely, <br />Nw ..~ <br />Janet . Binn <br />Envir nmental section pecialist <br />Enclosure <br />STATE OF COLORADO <br />c:\jhb\C820~6\MR 154fwd.wpd <br />