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POWDERHORN <br />COAL COMPANY <br />October 7, 1992 <br />Ms. Janet H. Binns <br />Reclamation Specialist <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, CO 80202-2273 <br />RE: North Decline Final Contours, <br />Dear Ms. Binns: <br />Enclosed please find revised pages and an exhibit to respond to your September <br />24, 1992, letter. These pages and exhibit are designed to replace previously <br />submitted pages and exhibits. <br />Runoff calculations have been rerun through Trihydro without an infiltration <br />rate. On July 21, 1992, Steve Wathens and I discussed some of the assumptions <br />used in his July 6, 1992, calculations. As a result these new calculations <br />do have different assumptions than his July 6 calculations. <br />OCT 1~ 1992 <br />O,1V~g~ ~~ ~~G`~~rV <br />E~P~S <br />TR~~, File No. C-81-041 <br />iii iiiiiiiiiiiiiiii <br />sss <br />P.O. Box 1430 <br />Palisade, Colorado 61626 <br />(3031464-7961 <br />Fax (303) 4647181 <br />Enclosed please find the following: <br />Page 166 <br />Page 171c <br />Page 174 <br />Page WW-26, Appendix WW <br />Page WW-27, Appendix WW <br />Page AAA-6, Appendix AAA <br />Page AAA-7, Appendix AAA <br />Exhibit 22 <br />Revised to reflect new Pond 7 <br />Revised to reflect new North <br />capacities. <br />Revised to reflect new Pond 7 <br />Revised runoff calculation. <br />Revised runoff calculation. <br />Revised runoff calculation. <br />Revised runoff calculation. <br />Revised to show Pond 7 size. <br />capacity. <br />Decline sump <br />peak discharge. <br />I trust that these calculations wil] complete the TR-13. Let me know if you <br />have any further questions. <br />Sincer ly, <br />Larry/hi. Reschke <br />Engineer <br />LMR:th <br />Enclosures <br />cc: Bob Hagan, OSM <br />John Singlaub, BLM <br />Bruce Conrad, BLM <br />Rick Holbrook, OSM <br />W.C. Jennings, Powder River Coal <br />