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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: (303) 866-3567 <br />FAX: (303) 832-8106 <br />27 September 2002 <br />Ms Kathy Welt <br />Oxbow Mining LLC <br />P.O. Box 535 <br />Somerset CO 81434 <br />RE: 2nd Adequacy Letter, MR-64 <br />Dear Ms. Welt: <br />DIVISION OE <br />MINERALS <br />GEOLOGY <br />RECLAMATION <br />MINING•SAFETY <br />Bill Owens <br />Governor <br />Greg E. Walther <br />Executive Director <br />Ronald W. Cattany <br />Acting Division Director <br />The Division review of Oxbow's responses, dated September 18, 2002, to our adequacy review letter dated <br />August 30, 2002. The numbering of this memo is consistent with the numbering of the operator's submittal <br />dated September 18, 2002. <br />1. Please detail the methodology used for obtaining the value of 14.0 gaVmin/ft for the flow rate <br />through a straw bale. <br />2. Response accepted. Revised Sedcad designs were submitted. <br />3. Response accepted. A revised sheet 3 of 4 of Map 2.05-M4 was submitted. <br />4. Response accepted. A revised sheet 3 of 4 of Map 2.05-M4 was submitted. <br />5. Response accepted. Revised Sedcad designs were submitted. <br />6. Response accepted. A revised Figure 1 was submitted. <br />7. Response accepted. A revised Figure 1 was submitted. <br />8. According to the topsoil downdrain Sedcad run, the bottom width of the channel is I O feet and [he <br />riprap D50 value is 6 inches. These values do not appear in Figure 1 for the topsoil downdrain. <br />Please revise Figure 1 according. <br />[f you have any questions, please let me lrnow. <br />Sincerely, <br />®X <br />Tim Burnell <br />Environmental Protection Specialist <br />Cc: Sandy Brown <br />