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� v <br /> • � <br /> SEPTIC SYSTEM INFORMATION SHEET <br /> WHAT IS IN MY BACK YARD AND HOW DOES IT WORK? .. .... ___ <br /> Most houses built in Ororio after 1960 where city sewer is not <br /> available have two septic tanks, one or more distribution boxes and <br /> a number of drainfield trenches . In the septic tanks, heavy sewage <br /> solids will settle to the bottom and be decomposed by anaerobic <br /> (oxygen-free) bacteria action. Floating solids such as grease, <br /> fat, and soap scum will be retained inside the tank by baffles at <br /> the inlet and outlet . This ensures that the effluent entering the <br /> drainfield is relatively free of solids, which tend to clog up clay <br /> soils. <br /> Many houses built after 1975 have mound drainfields . These <br /> systems function on the s�m� principles as trench drainfields <br /> except that the trench bed is installed above the original ground <br /> to provide a separation from the seasonally high water table and <br /> allow the system to function adequately. <br /> TRENCH SYSTEM <br /> p c -a-, � c —e c �o � a-z' c -a o o�� . <br /> � , a o • o � r� � s y. � � - . d y �=i. <br /> .. . � � i i�-'. � � • � • -!— C f9 e� . . . • <br /> .._ II���.,.,1.�t ��. . . ; : . <br /> floating solids distribution box <br /> - •-• -, drainfields <br /> sludge : � <br /> J • <br /> IvIQUND SYSTEM <br /> _. _='':'�rt, •r•sr.� •; _s•i- �1��r= _._. <br /> �ing chamber <br /> HOW CAN I MAKE MY SEPTIC SYSTEM LAST LONGER? <br /> l. Do not use your toilet or kitchen sink as a garbage can. <br /> Undigested foods and cigarette butts will not decompose in the <br /> septic tanks (this includes the use of garbage disposals ! ) . <br /> 2 . Have your tanks pumped at least once every three years (once every <br /> two years is necessary with garbage disposals) . This will probably <br /> cost you $80 - $125 . If you do not specifically ask the pumping <br /> contractor to open up your tanks, he will probably just put the <br /> � hose down the inspection riser and drain the liquid from the tanks. <br /> This inethod will not effectivelv remove the solids! The tanks <br /> should be opened in order to. stir the contents while pumping to <br /> break up the sludge and scum layers. The baffles can also be <br /> cleaned, examined, and repaired (if necessary) at this time. <br />