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INLET FROM <br />SEPTIC TANK <br />OR PREVIOUS <br />DROP Box -7 <br />`m-AINLE <br />OUTLET TO <br />TRENCH <br />SUPPLY LINE <br />TO NEXT <br />DROP BOX <br />OUTLET TO <br />TRENCH <br />NOTES <br />I. ALL PIPES SHOULD BE AT LEAST 4 -INCH <br />DIAMETER, <br />2. ELEVATION OF INLET AND SUPPLY LINE TO <br />NEXT DROP BOX MAY BE ADJUSTED UP OR <br />DOWN FOR DESIRED EFFLUENT LEVEL IN <br />TRENCH. <br />3. SUGGESTED TRENCH LIQUID LEVEL IS AT <br />TOP OF TRENCH ROCK IF PERMEABLE <br />SYNTHETIC FABRIC COVERS ROCK; AT TOP <br />OF OUTLET PIPE IF HAY OR STRAW <br />COVERS ROCK. <br />4. INVERT OF INLET MUST BE AT LEAST ONE <br />INCH HIGHER THAI4 INVERT OF SUPPLY <br />PIPE TO NEXT DROP BOX. <br />5. TRENCHES MAr OUTLET ONE SIDE OR <br />BOTH SIDES OF DROP BOX. <br />- T SUPPLY I , INLET <br />i I LINE ► " <br />SUPPLY LINE <br />2" <br />I <br />-- ----- OUTLETS- <br />_ _ TO TRENCH I ' OUTLET TO <br />_ - - L---- TRENCH <br />DROP BOX <br />DETAIL 9 <br />