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4" DIAMETER PERFORATED 15' MINIMUM <br /> PIPE BACKDRAIN <br /> 4" DIAMETER NON-PERFORATED <br /> PIPE LATERAL DRAIN <br /> SLOPE PER PLAN <br /> 2.0% <br /> FILTER MATERIAL - BENCHING <br /> H/2 <br /> 1' <br /> 2' MI 2% MIN _ <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 /> STANDARD SPECIFICATIONS FOR GRADING <br /> Page 18 of 26 <br />