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I <br />FIGURE S <br />12' EARTH GRASS COVER <br />COVER <br />ti ♦ x � <br />r — —__._- .. .. 1"ter.• <br />O O r <br />SEPTIC <br />TANK - DROP BOXES <br />4' DISTRIBUTION 1 1 <br />PIPES <br />DROP <br />BOX <br />SEPTIC - - - - �--�• ,':: <br />TANK - � ....---••- �--.rl,•-,' <br />EXTRA TRENCHES ' <br />CAN BE , <br />I I ADDED IF r <br />1' WATER -TIGHT NECESSARY <br />PIPES - - <br />SEWAGE TREATMENT SYSTEM WITH DROP BOXES <br />OUTLET TO <br />TRENCH <br />INLET FROM <br />SEPTIC TANK <br />OR PREVIOUS <br />DROP BOx <br />- SUPPLY LINE <br />TO NEXT <br />DROP BOX <br />OUTLET TO <br />TRENCH <br />NOTES <br />FIGURE 6 <br />I. ALL PIPES SHOULD BE AT LEAST <br />4 -INCH DIAMETER <br />2. ELEVATION OF INLET AND SUPPLY <br />LINE TO NEXT DROP BOX MAY BE <br />ADJUSTED UP OR DOWN FOR DESIRED <br />EFFLUENT LEvELIN TRENCH <br />3 SUGGESTED TRENCH LIOUID LEVEL <br />IS 2' ABOVE TOP OF OUTLET PIPE <br />4 INVERT OF INLET MUST BE AT LEAST <br />ONE INCH f4iGHER THAN INVERT OF <br />SUPPLY PIPE TO NEXT DROP BOX <br />g TRENCHES MAY OUTLET ONE SIDE OR <br />BOTH SIDES OF DROP BOX <br />---- -- <br />INLET <br />�- SUPPLY <br />r I <br />' <br />- SUPPLY <br />LINE <br />I 1 <br />LINE <br />I 1 <br />-- <br />I ' <br />1 <br />T -; 1 <br />I I ' <br />J <br />i-OUTLET <br />TO <br />-O-JTLETS <br />j <br />TRENCH <br />TU TRENCH <br />DROP Box <br />