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iii iiiiiiiiiiiiiiii <br />999 <br />u <br />~'~ ATTACHMENT 13-6 <br />DITCH CALCULATIONS <br />for <br />SENECA II-W MINE SITE <br />ROUTT COUNTY, COLORADO <br />by <br />PEABODY COAL COMPANY <br /> <br />Doc Date:12M 112001 <br /> <br /> <br />