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j <br />) <br />-OUTLET TO <br />H~ENCH <br />T:- <br />1 'J r T - <br />I I l' .. :-' -i-·-·-2 .. ~ ·}-... , <br />NOTES <br />I. ALL PIPES SHOULD BE 1/.T LEAST 4 -INCH <br />DIAMETER. <br />2. ELEVATION OF INLET ANO SUPPLY LINE 1"0 <br />NEXT DROP BOX MAY OE AD,JUSTEO _ UP OR <br />DOWN f"OR DE51P':!• !:;'FLUEt<l LrVEL IN <br />TRENCH. <br />3. SUGGESTED TRENCH LIQUID LEVELS: (A) 2 INCHES <br />ABOVE TOP OF OUTLET PIPE IF PERMEABLE <br />SYNTHETIC FABRIC COVERS ROCK;. (8) AT TOP <br />OF OUTLET PIPE IF HAY OR STRAW ANO <br />BUILDING PAPER COVERS ROCK. <br />4. INVERT OF INLET MUST BE AT LEAST ONE INCH <br />HIGHER THAN INVERT OF SUPPLY PIP£ TO <br />NEXT DROP BOX. <br />5. TJ'1ENCHES MAY OUTLET ONE SIDE OR BOTH <br />SIDFS OF nnoP fJOX. <br />_L..._._,1;.,_ ____ _,w--~~ <br />'"L-----,---4·, <br />/--, .-:~-··-INLET <br />9--1 --SUPPLY LINE ., -r <br />-I <br />I I 1/ <br />I. J,... -T I . 11-01, --- <br />: -{·---OIJTLETS-'" <br />I ,..1 _ <br />-7-j ' I <br />I I I I --1-' L 1--- <br />1 1 TO TRENCH L-------' <br />1 I · OUTLET TO <br />L-------.J TREtJCH <br />DROP BOX <br />GRAVELLESS TRENCH CONSTRUCTION DETAILS <br />Inspection <br />Backfill <br />.._----Trench Length = up to , 00 Feet-----i►MI <br />Overfill to Allow NOTES: 1. Bottom of trench must be level. Top <br />of tubing must be le_vel. <br />12· of Soil <br />24 .. : Backfil_l_ •~ Backfill LLO! T . <br />I ~~-Holes Located <br />j.-24 • -.J "'-at 4 and <br />8 O'Clock <br />2. Scarily trench bottom and sidewalls <br />al least 12 inches abo'lfc trench bottom <br />to expose natural soil. <br />3. For proprietary products consult · · . <br />manufacturers perlormance criteria. <br />Figure D-33