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ncuRC S c <br />SEWAGE TREATMENT SYSTEM WITH DROP BOXES <br />( <br />inlet from <br />SEPTIC TANK <br />OR PREVIOUS <br />DROP BOX <br />OUTLET TO <br />TRENCH <br />SUPPLY LINE <br />TO NEXT <br />DROP BOX <br />fIGURC 6 <br />I. <br />5 <br />4. <br />5OUTLtTS <br />10 THCNCH <br />DROP BOX <br />N_oies_ <br />ML Pl»’ts tWOULO at AT I LAST <br />4 -INCH DiAMEItJ* <br />EICVATION or INl ET AND SUPPLY <br />LINE TO NEXT D«OP BOX MAY BE <br />ADJUSTED UP OR DOWN TOR OESIWLO <br />ETELUENT LEVEL IN TRENCH <br />SUGGESTED TRENCH LiOUlO I EvEL <br />IS 2 ‘ABOVE TOP or OUTltT PIPE <br />INVERT or INlET MUST BE AT LEAST <br />ONE INCH higher THAN INVERT OT <br />SUIT\.Y PIPE TO NEXT DROP BOX <br />TRENCHES MAY OUTLET ONE SlOE OR <br />BOTH SIDES or DROP BOX <br />-INLET <br />- SUPPLY <br />LINE <br />OUIIET TO <br />TR lNCH