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<br />POWDE1tHORN COAL COMPANY <br />Midterm Drainage Control Calculations <br />Certification <br />As part of the Midterm review of Powderhorn's Permit No. C-81- <br />041, revisions and new drainage design was necessary for several <br />locations. These calculations were prepared using Sedcad 3 and <br />assumptions stated within the calculations. These new pages have <br />a new date of March 1, 1996, to be consistent with other <br />submissions, although, many of the sheets have as subsequent <br />design date. <br />I, Larry M. Reschke, PE 19691, hereby certify that the following <br />pages in Appendix 13-2 dated (New 3/1/96) have been prepared by <br />myself or under my direct supervision, and that the information <br />contained in the calculations is true and correct to the best of <br />my knowledge and belief: <br />RSN-13 thru 38 <br />RSS-5 thru 14 <br />RSS-19 thru 27 <br />• RSS-29 thru 35 <br />Misc-13 thru 19 <br />• INFO-6 <br />,~.~,,~~ <br />29-9 <br />(New 3/1/96) <br />