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• <br />i <br />• <br />Doc Date:1211112001 <br />S~ E CHAPTER C <br />MINE OPERATION PLAN <br />APPENDIX A <br />DIVERSION DITCH AND SEDIMENT <br />POND CALCULATIONS <br />PORTAL/COAL STOCKPILE AREA <br />NORTHERN N0. 1 MINE <br />iii iiiiiiiiiiiuiii <br />sss <br /> <br />