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NATURAL <br /> GROUND <br />123*M-pGIAL-- >DE-----Pcl->W <br />TYPICAL <br />BENCHING <br />L-bl: <br />REMOVE <br />UNSUITABLE MATERIAL <br />L- 4 <br />- SUBDRAINr 1 <br />(See Altemates A and B) <br />SUBDRAIN ALTERNATE A PERFORATED PIPE SURROUIWDED <br />WITH FILTER MATERIAL <br />FILTER MATEmAL (9FT Wr) <br />FILTER MATERIAL <br />FILTER MATERIAL SHALL BE CLASS 2 PERMEABLE M,JERIAL PER STATE OF <br />CALIFURNIA STANDARD SPECIFICATION, OR APPROVED ALTERNATE. <br />CLASS 2 GMDING AS FOUOWS: <br />ge•,e Uze Peromlt pa-*10 <br />SUBDRAIN ALTERNATE A-1 <br />4MIN 4 <br />PERFORATED MPE <br />6- 0 MIN. <br />No. 200 <br />SUBDRAIN ALTERNATE A-2 <br />SUBDRAIN ALTERNATE B DETAIL OF CANYON SUBDRAIN TERMINAL <br />3/4" GRAVEL WRAPPED IN FILTER FABRIC-r..."" <br />12" MIN. OVERLAP . <br />FILTER FABRIC <br />(MIRAFI 140NC OR <br />APPROVED EQUIVALENT) <br />--1'-' <br />ALTERNATE B-1 3/4' MAX GRAVEL OR NO»fERFORATED <br />APPROVED ENNALENT ALTERNATE B-2 6'0 'CIM L <br />(9FT3/m <br />C PERFORATED PIPE IS OPTIONAL PER <br />GOVERNING AGENCTS REQUIREMENTS <br />1 <br />EILTER FRRIC <br />{MmAFI l<ON OR <br />0 )04. Ma,m AppROMD ee[!VALS,T) <br />PERFORATED 3/4- 0/94 GRADED GIUVE <br />OR APPVOJED BNNMER <br />ISHe GIADE <br />r 1 T . <br />CANYON <br />SUBDRAIN <br />GENERAL EARTHWORK AND GRADING <br />SPEOFICATIONS <br />STANDARD DETAILS C Leighton <br />P:DI•fting\t-18*#dat*larmr*alns- 0/001