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<br />r <br />-i <br /> <br />Original Grade of ~~~~~ <br />Competent Material <br />~. ~ ~ <br />Finished P111 Slope <br />Surface <br />4 inch ~ ~ ~ <br />minimum diameter <br />pipe surrounded ~ ~ ~ <br />by at least 4 <br />~ cubic feet per <br />linear foot of Bench Drain <br />graded filter a: <br />aggregate surrounded P <br />- = by an appropriate geotextile ° <br />~ filter fabric <br />N <br />Toe Drain <br /> <br />• <br />TOE ACID BENCH DRAIN CONCF.~T <br />