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PENCIL <br />MARKS <br />6" <br />MANHOLE <br />INLET._ _ t , <br />�= SCUM �' OUTLET <br />• • ';OUTLET LEVEL <br />- SCUM CLEAR SPACE <br />CLEAN OUT TANK WHEN <br />IS 3" OR LESS OR <br />B "8" IS 12" OR LESS <br />BLACK COLOR <br />• SLUDGE DISTINGUISHES SLUDGE <br />LAYER FROM LIOUID <br />MEASURE SCUM AND SLUDGE ACCUMULATIONS <br />IN THE SEPTIC TANK <br />