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C C Cripple Creek & Victor Gold Mining Company <br />~ T A Joiht Venture - ANGLOGOLD (COLOw.oo) coRV., Manager <br />& Y Operations Office <br />1~7X4r P.O. Box 191 • 100 North 3rd Street <br />Victor, Colorado 80860 <br />(719) 689-2977 • Fax (719) 6893254 <br />SENT CERTIFIED, RETURN RECEIPT REQUESTED <br />7000 0600 0028 6377 1083 <br /> <br />May 6, 2002 <br />RECEIVE® <br />MAY 0 7 2002 <br />Mr. Berhan Keffelew <br />Environmental Protection Specialist <br />Colorado Department of Natural Resources <br />Division of Minerals and Geology <br />Office of Mined Land Reclamation <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />Division of Minerals and Geology <br />RE: Phase IVb/Phase IVc Temoorarv Diversion Channel Sizing <br />Dear Mr. Keffelew: <br />Enclosed please find the channel sizing design package completed by Golder <br />Associates for the temporary diversion channel located between Phase IVb and Phase <br />IVc of the Valley Leach Facility ("VLF"). This temporary channel will be in place while <br />Phase IVb is being constructed and will ultimately be replaced by the permanent <br />diversion channel upon construction of Phase IVc of the VLF, as we have discussed on <br />several site inspections. <br />The temporary channel is sized for the 25 year 24 hour storm event. Curve numbers <br />appropriate for the soils and vegetation types within the sub basins are utilized in <br />accordance with published criteria. HEC-1 computer modeling was completed to size <br />the temporary channel. <br />Please contact me at (719) 689-4056 should you have questions. <br />Sin , <br />Phll Barnes <br />Manager Environmental Resources <br />Enclosure <br />Permit #: Confidental?: <br />Class: Type-Seq.: <br />To'. <br />From: <br />Doc. Name: ~ _ , _„~ . <br />Doc. Date (if no date stamp): <br />