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SURFACE OF <br />COMPETENT <br />MATERIAL <br />_j ---------------- <br />\ \ COMPACTED FILL /1010, <br />TYPICAL BENCHING <br />\ / REMOVE UNSUITABLE <br />0 MATERIAL <br />SEE DETAIL BELOW <br />INCLINE TOWARD DRAIN <br />AT 2% GRADIENT MINIMUM <br />1 r T A 11 <br />MINIMUM 9 FT PER LINEAR FOOT <br />OF APPROVED FILTER MATERIAL <br />FILTER MATERIAL TO MEET FOLLOWING <br />SPECIFICATION OR APPROVED EQUAL: <br />SIEVE SIZE <br />V, <br />Y4" <br />V. <br />NO.4 <br />NO. 30 <br />NO. 8 <br />NO. 50 <br />NO. 200 <br />14" <br />MINIMUM <br />PERCENTAGE PASSING <br />100 <br />90-100 <br />40-100 <br />25-40 <br />18-33 <br />5-15 <br />0-7 <br />MINIMUM 4" DIAMETER APPROVED <br />PERFORATED PIPE (PERFORATIONS <br />DOWN) <br />6" FILTER MATERIAL BEDDING <br />APPROVED PIPE TO BE SCHEDULE 40 <br />POLY -VINYL -CHLORIDE (P.V.C.) OR <br />APPROVED EQUAL. MINIMUM CRUSH <br />STRENGTH 1000 psi <br />PIPE DIAMETER TO MEET THE <br />FOLLOWING CRITERIA, SUBJECT TO <br />FIELD REVIEW BASED ON ACTUAL <br />GEOTECHNICAL CONDITIONS <br />ENCOUNTERED DURING GRADING <br />LENGTH OF RUN PIPE DIAMETER <br />0-3 NOT TO SCALE <br />INITIAL 500' 4" <br />500' TO 1500' 6" <br />> 1500' 8" <br />TYPICAL CANYON SUBDRAIN DETAIL <br />STANDARD SPECIFICATIONS FOR GRADING <br />Page 14 of 26 <br />