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FINISH SURFACE SLOPE <br /> MINIMUM 3 FT3 PER LINEAR FOOT <br /> OPEN GRADED AGGREGATE* <br /> TAPE AND SEAL AT COVER <br /> CONCRETE COLLAR <br /> PLACED NEAT <br /> COMPACTED FILL <br /> A <br /> MIRAFI 140N FABRIC OR <br /> �— 2.0% MINIMUM GRADIENT APPROVED EQUAL <br /> A 4" MINIMUM APPROVED <br /> MINIMUM 4" DIAMETER PERFORATED PIPE <br /> SOLID OUTLET PIPE (PERFORATIONS DOWN) <br /> MINIMUM 2% GRADIENT <br /> SPACED PER SOIL <br /> ENGINEER REQUIREMENTS TO OUTLET <br /> TYPICAL BENCH INCLINED <br /> BENCHING TOWARD DRAIN <br /> DETAIL A-A <br /> TEMPORARY FILL LEVEL <br /> MINIMUM :;OMPACTEC MINIMUM 4" DIAMETER APPROVED <br /> 12"COVER BACKFILL SOLID OUTLET PIPE <br /> 12" <br /> ol <br /> MINIMUM <br /> *NOTE:AGGREGATE TO MEET FOLLOWING <br /> SPECIFICATIONS OR APPROVED EQUAL: <br /> SIEVE SIZE PERCENTAGE PASSING <br /> 1 %" 100 <br /> 1" 5-40 <br /> %4" 0-17 <br /> s" 0-7 <br /> NOT TO SCALE <br /> NO. 200 0-3 <br /> BACKDRAIN DETAIL (GEOFRABIC) <br /> STANDARD SPECIFICATIONS FOR GRADING <br /> Page 23 of 26 <br />