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15' MIN. <br />1 . <br />. <br />, I <br />I . <br />OUTLET PIPES <br />44 NON-PERFORATED PIPE, <br />100'MAX. O.C. HORIZONTALLY <br />30' MAX. O.C. VERTICALLY <br />/ 19\ <br />/ <br />1 ir- <br />,. <br />./ i\\ <br />,. <br />BACKCUT <br />f J BENCHING <br />4:21\ <br />i X <br />\/- /11 Iliff.---4-1 /1 <br />-- 2% MIN. -Lgj <br />2% MIN. -/-1 <br />1 I-15' MIN. <br />KEY DEFTH I KEY WIDTH <br />2' MIN. <br />SUBDMIN ALTERNATE B <br />/MIN. 12'OVERLAP FROM THETOP <br />SUBDRAIN ALTERNATE A POSrrIVE SEAL SHOULD BE PROVIDED <br />AT THE JOINT <br />OUTLET PIPE <br />(NON-PERFORATED) <br />Y <br />FILTER FABRIC <br />- RAF40 OR <br />EQUIVALEND <br />CALTMNS CASS 2 <br />FILTER MATERIAL (3FT,3/FT) <br />. <br />OUTLET PIPE <br />(NON·-PERFORATED) <br />6% <br />/37 W MIN.3/4' ROCK OFT?/Fr) - <br />WRAPPED IN FILTER FABRIC <br />TCONNECTION FROM <br />COLLECTION PIPE TO OUTLET PIPE <br />• SUBDRAIN INSTAUATION - Subdraln collector pipe shall be Installed with perforadons down or, <br />unless otherwise designated by the geotechnical consultant. Outlet pipes shall be non-perforated <br />pipe. The subdrain pipe shall have at least 8 perforations uniformly spaced per foot Perforation shall <br />be 1/4" to 1/2" If drilled holes are used. All subdraln pipes shall have a gradient at least 2% towards the <br />outlet. <br />SUBDRAIN PIPE - Subdrain pipe shall be ASTM D2751, ASTM D1527 (Schedule 40) or SDR 23.5 ABS pipe <br />or ASTM D3034 (Schedule 40) or SDR 23.5 PVC pipe. <br />All outlet pipe shall be placed in a trench and, after fill is placed above it, rodded to verify integrity. <br />BUTTRESS OR <br />REPLACEMENT FILL <br />SUBDRAINS <br />GENERAL EARTHWORK AND GRADING <br />SPECIFICATIONS <br />STANDARD DETAILS D <br />21 <br />Leighton <br />SL Rved 2019.01.21 <br />P:DreftN\tE**\detaih\butbmi-revl-Wb.dwg (7/00)