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4" DIAMETER PERFORATED <br />PIPE BACKDRAIN <br />4" DIAMETER NON -PERFORATED <br />PIPE LATERAL DRAIN <br />SLOPE PER PLAN <br />FILTER MATERIAL <br />2' MIND' 1 2% <br />15' MINIMUM <br />2.0% <br />f - <br />ENCHING <br />H/2 <br />AN ADDITIONAL BACKDRAIN <br />AT MID -SLOPE WILL BE REQUIRED FOR <br />SLOPE IN EXCESS OF 40 FEET HIGH. <br />KEY -DIMENSION PER SOILS ENGINEER <br />(GENERALLY 1/2 SLOPE HEIGHT, 15' MINIMUM) <br />DIMENSIONS ARE MINIMUM RECOMMENDED <br />NOT TO SCALE <br />TYPICAL SLOPE STABILIZATION FILL DETAIL <br />I STANDARD SPECIFICATIONS FOR GRADING I <br />Page 18 of 26 <br />