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\ <br />TRENCHncnwn <br />NATURAL SOIL <br />COVER <br />6** DIAMETER <br />PERFORATED PLASTIC <br />PIPE-LAID FLAT ANO" <br />LEVEL <br />• ' ? f <br />UNTREATED <br />BUILDING PAPER <br />^ TO 3“ WASHED GRAVEL <br />4b • <br />h-3#^ <br />TRENCH SECTION <br />.NATURAL SOIL COVER <br />▼ crn • ^ lo**UNTREATED <br />BUILDING PAPER i <br />6“ DIAMETER - -4"T0 3‘* WASHED GRAVEL <br />E A HICKOX & ASSOCIATES <br />HYDROLOGISTS - ENGIN2ERS <br />MINNEAPOLIS MINNESOTA