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TYPICAL STABILIZATION / BUTTRESS SUBDRAIN DETAIL <br />FILTER MATERIAL: MINIMUM OF FIVE FP/LINEAR Fl OF PIPE <br />OR FOUR Fl'/LINEAR Ft OF PIPE WHEN PLACED IN SQUARE <br />CUT TRENCH. <br />ALTERNATIVE IN LIEU OF FILTER MATERIAL: GRAVEL MAY BE <br />ENCASED IN APPROVED FILTER FABRIC. FILTER FABRIC <br />SHALL BE MIRAFI 140 OR EQUIVALENT. FILTER FABRIC <br />SHALL BE LAPPED A MINIMUM OF 12-ON ALL JOINTS. <br />MINIMUM 2- MINIMUM MINIMUM 4- DIAMETER PIPE: ABS-ASTM 0-2751, SOR 35 <br />PIPE <br />OR ASTM O-1527 SCHEDULE 40 PVC-ASTM 0-3034, <br />SOR 35 OR ASTM D-1785 SCHEDULE 40 WITH A CRUSHING <br />STRENGTH OF 1,000 POUNDS MINIMUM, AND A MINIMUM OF <br />MINIMUM 8 UNIFORMLY SPACED PERFORATIONS PER FOOT OF PIPE <br />PIPE -INSTALLED WITH PERFORATIONS OF BOTTOM OF PIPE. <br />PROVIDE CAP AT UPSTREAM END OF PIPE. SLOPE AT 2% <br />TO OUTLET PIPE.OUTLET PIPE TO BE CONNECTED TO <br />SUBORAIN PIPE WITH TEE OR ELBOW. <br />NOTE. 1. TRENCH FOR OUTLET PIPES TO BE BACKFILLED <br />WITH ON-SITE SOIL. <br />2- MINIMUM 2. BACKORAINS AND LATERAL DRAINS SHALL BE <br />LOCATED AT ELEVATION OF EVERY BENCH DRAIN. <br />FIRST DRAIN LOCATED AT ELEVATION JUST ABOVE <br />LOWER LOT GRADE. ADDITIONAL DRAINS MAY BE <br />REQUIRED AT THE DISCRETION OF THE SOILS <br />ENGINEER AND/OR ENGINEERING GEOLOGIST. <br />/GIJRkh <br />1 NnWINIW.E <br />FILTER MATERIAL SHALL BE OF <br />THE FOLLOWING SPECIFICATION <br />OR AN APPROVED EQUIVALENT: <br />SIEVE SIZE PERCENT PASSING <br />1 INCH 100 <br />3/4 INCH 90-100 <br />3/8 INCH 40-100 <br />NO. 4 25-40 <br />NO. 8 18-33 <br />NO. 30 5-15 <br />NO. 50 0-7 <br />NO. 200 0-3 <br />GRAVEL SHALL BE OF THE <br />FOLLOWING SPECIFICATION OR <br />AN APPROVED EQUIVALENT: <br />SIEVE SIZE PERCENT PASSING <br />1 1/2 INCH 100 <br />NO. 4 50 <br />NO. 200 8 <br />SAND EQUIVALENT: MINIMUM OF 50PLATE EG-5 <br />i