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INLET <br />UI <br />ii <br />PENCIL <br />MARKS <br />or ly <br />i • <br />s OUTLET <br />-- • _ _ SCUM CLEAR SPACE -- -_ r CLEAN OUT TANK WHEN <br />*0 IS 3' OR LESS OR <br />'E' IS 120 OR LESS <br />i BLACK COLOR <br />SLUDGE DISTINGUSHES SLUDGE <br />LAYER FROM LIQUID <br />MEASURE SCUM AND SLUDGE ACCUMULATIONS <br />IN THE SEPTIC TANK <br />Ir, <br />