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40 <br />I N LET <br />PIPE TO NEXT <br />DROP BOX <br />TRENCH CONSTRUCTION DETAILS" <br />4" DIAMETER INSPECTION <br />WELL WITH CAP <br />' EARTH BACKFILL AT LEAST 4 TO 6 INCH LAYER OF • ' <br />/� 6" ABOVE TOP OF ROCK MARSH HAY OR STRAW AND <br />.�T.� A LAYER OF RED ROSIN <br />WOMON PIPE PAPER <br />AT LEAST 6" DEPTH OF CLEAN • `� <br />rROCK 3/4" TO 2'/p" DIA. • <br />DROP BOX <br />MAXIMUM LENGTH s 100 FEET ---� <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 />BACKFILL • 6" TO 12" OF 100 FEET. <br />o ' SOIL BACKFILL 3. DISTRIBUTION PIPE CAN BE PERFORATED <br />--,NAF, • _:L PLASTIC WITH 1/2 INCH OR LARGER HOLES. <br />,,,,; V• Vw.,.�M` <br />• <br />_ <br />�2" DEPTH OF <br />ONE OF THE ROWS OF HOLES MUST BE <br />LOCATED ALONG THE BOTTOM OF THE <br />PIPE. <br />• <br />ROCK ABOVE <br />PIPE <br />ONE -FOOT <br />AGRICULTURAL DRAIN TILE <br />1/4 <br />CAN <br />•_T <br />BE USED <br />WITH A INCH SPACING. <br />ROCK <br />• <br />AT LEAST 6" OF <br />ROCK BELOW <br />4. SCARIFY <br />TRENCH BOTTOM AND SIOEWALLS <br />PIPE <br />AS HIGH <br />TRENCH <br />AS ROCK WILL BE PLACED IN <br />IN ORDER TO EXPOSE NATURAL <br />THE <br />SOIL. <br />1all TO 36" <br />—� <br />REMOVE <br />LOOSE SOIL BEFORE PLACING <br />ROCK, <br />5. WHERE TREES ARE °RESENT 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 />