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FINISH SURFACE SLOPE <br /> 3 FT3 MINIMUM PER LINEAR FOOT <br /> APPROVED FILTER ROCK* <br /> CONCRETE COLLAR <br /> PLACED NEAT <br /> COMPACTED FILL <br /> A <br /> �- 2.0% MINIMUM GRADIENT <br /> A 4" MINIMUM APPROVED <br /> 4" MINIMUM DIAMETER PERFORATED PIPE** <br /> SOLID OUTLET PIPE (PERFORATIONS DOWN) <br /> MINIMUM 2% GRADIENT <br /> SPACED PER SOIL <br /> ENGINEER REQUIREMENTS TO OUTLET <br /> DURING GRADING 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 /> MINIMUM <br /> *FILTER ROCK TO MEET FOLLOWING <br /> **APPROVED PIPE TYPE: SPECIFICATIONS OR APPROVED EQUAL: <br /> SCHEDULE 40 POLYVINYL CHLORIDE SIEVE SIZE PERCENTAGE PASSING <br /> (P.V.C.)OR APPROVED EQUAL. 1" 100 <br /> MINIMUM CRUSH STRENGTH 1000 PSI Y 90-100 <br /> %11 40-100 <br /> NO.4 25-40 <br /> NO. 30 5-15 <br /> NO. 50 0-7 <br /> NO. 200 0-3 <br /> NOT TO SCALE <br /> TYPICAL BACKDRAIN DETAIL <br /> STANDARD SPECIFICATIONS FOR GRADING <br /> Page 22 of 26 <br />