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4. <br />PENCIL <br />MARKS <br />20" vi ' — n <br />MANHOLE <br />/ C All - - <br />INLET SCUM ... <br />` ;1 <br />OUTLET <br />LEVEL <br />- SCUM CLEAR SPACE —= <br />— �� ;; <br />CLEAN OUT TANK WHEN: <br />"A" IS V OR LESS OR <br />"B" IS 12" OR Lc -SS <br />' <br />BLACK COLOR <br />SLUDGE <br />DISTINGUISHES SLUDGE <br />LAYER FROM LIQUID <br />MEASURE SCUM AND SLUDGE ACCUMULATIONS <br />IN THE SEPTIC TANK <br />