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l-» — -i. -» <br />. ^ ^ I t I *-* I t I s>o A <br />Sludge, or scplagc, Includes the scUlcd maicrials at ihc boito'M of llic <br />tank. (lie floating scum materials at die top of the tank and the liquid in <br />the lank at the time of clcanlnu. The septic tank should be cleaned <br />whenever the lop of (he sludge layer is closer than 12 inches lo the <br />bull out of llie otillcl baflle or whenever the botlom of llie scum <br />layer is closer llinii 3 Inches to Die boliuiu of (lie oullcl baffle. Uoth <br />conditions likely will not occur at the same time in a septic tank, but <br />either condition requires tank cleaning. <br />-PENCIL ,-----, <br />MANHOLE i <br />y a <br />ir <br />■4 <br />SCUM CLEAR SPACE'—'ATTrli <br />-'•—ru.-r j.::_:^3zrA^rdl <br />tVr.V-*.*-. \ <br />sludge 'y{' <br />A-U.l <br />“if.V <br />y CLEAN Out tank wi ieni <br />T V IS 3* on LESS on <br />V15 la* on LESS <br />»- <br />•OLACK COLOR <br />y DISTINGUISHES SLUDGE LAv^n rnoM liquid <br />measure scum gAND ^swdge accumulations <br />To determine scum acciimulaiiun, u.sc a tlnec-hich stpiarc piece of <br />wood attached to the bottom of a long stick, rush the measuring <br />device through the scum layer into the liquid layer. If the Stick is <br />carefully moved down and up, rc-sislance on tlic "foot" should locate <br />the txiUom of the scum layer. lupiipmeiU is also cueumcrcially avail ­ <br />able to measure scum and sludge accimuilatlons. <br />Mark the stick at a convenient reference point when you feel the <br />bottom of the scum layer. With the same stick, locate the bottom of <br />the outlet btifflc. Determine die distance between the bottom of the <br />scum layer and the boliom of the outlet baffle by measuring the dis­ <br />tance between the marks on the stiek.