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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 /> Imo. <br /> 1, � I — <br /> 2' MIN 2% MI <br /> ADDITIONAL BACKDRAIN AT <br /> MID-SLOPE WILL BE REQUIRED <br /> FOR SLOPE IN EXCESS OF 40 <br /> FEET HIGH. <br /> KEY-DIMENSION PER SOILS ENGINEER <br /> DIMENSIONS ARE MINIMUM RECOMMENDED <br /> NOT TO SCALE <br /> TYPICAL BUTTRESS FILL DETAIL <br /> STANDARD SPECIFICATIONS FOR GRADING <br /> Page 19 of 26 <br />