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I. <br /> ` <br /> L....% <br /> _~ . <br /> TRENCH CONSTRUCTION DETAILS . <br /> PIPE TO NEXT 4 DIAMETER INSPECTION <br /> INLET DROP BOX N WELL WITH CAP <br /> / vr EARTH BACKFILL AT LEASTy— <br /> ' <br /> TO 6 INCH LAYER OF o r r tri <br /> �� , 6" ABOVE TOP OF ROCK MARSH HAY OR STRAW AND ° <br /> ./ `.�A LAYER OF RED ROSIN ���� <br /> I _ _ _ A PAPER _ _� _ ' s2_,!..-,,y. <br /> 4" DISTRIBUTION PIPE .. <br /> _AT LEAST 6" DEPTH OF CLEAN ° <br /> `, ROCK 3/4" TO 2 I/2" DIA. ° <br /> DROP BOX V I <br /> MAXIMUM LENGTH = 100 FEET 3. 1 • <br /> OVERFILL NOTES : I . BOTTOM OF TRENCH MUST BE FLAT ALONG <br /> /-4 TO 6 INCHES LENGTH. <br /> INSPECTION 2. SLOPE ON DISTRIBUTION PIPE IS BETWEEN <br /> WELL LEVEL AND 4 INCHES PER 100 FEET. <br /> RECOMMENDED SLOPE IS I TO 2 INCHES PER <br /> t/ BACKFILL 06" TO I2" OF 100 FEET. <br /> ° SOIL BACKFILL 3. DISTRIBUTION PIPE CAN BE PERFORATED <br /> ° _ f PLASTIC WITH 1/2 INCH OR LARGER HOLES. <br /> w �, ." - - 0 ONE OF THE ROWS OF HOLES MUST BE <br /> ° -72" DEPTH OF LOCATED ALONG THE BOTTOM OF THE PIPE. <br /> y,�y� ° ROCK ABOVE ONE — FOOT AGRICULTURAL DRAIN TILE CAN <br /> "' ° PIPE BE USED WITH A '/4 INCH SPACING. <br /> ROCK ° AT LEAST 6" OF <br /> ROCK BELOW 4. SCARIFY TRENCH BOTTOM AND SIDEWALLS <br /> r:' PIPE AS HIGH AS ROCK WILL BE PLACED IN THE <br /> TRENCH IN ORDER TO EXPOSE NATURAL SOIL. <br /> . 18"TO 36" '-i REMOVE LOOSE SOIL BEFORE PLACING ROCK. <br /> 5. WHERE TREES ARE PRESENT OR LIKELY TO BE <br /> PRESENT DURING THE LIFE OF THE SYSTEM, <br /> 12 INCHES OF ROCK MUST BE PLACED UNDER <br /> THE DISTRIBUTION PIPE. <br />