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FINISH SURFACE SLOPE <br />3 FT MINIMUM PER LINEAR FOOT <br />APPROVED FILTER ROCK* <br />CONCRETE COLLAR <br />PLACED NEAT <br />2.0% MINIMUM <br />A- <br />4" MINIMUM DIAMETER <br />SOLID OUTLET PIPE <br />SPACED PER SOIL <br />ENGINEER REQUIREMENTS <br />DURING GRADING <br />MINIMUM <br />12" COVER <br />**APPROVED PIPE TYPE: <br />SCHEDULE 40 POLYVINYL CHLORIDE <br />(P.V.C.) OR APPROVED EQUAL. <br />MINIMUM CRUSH STRENGTH 1000 PSI <br />DIENT <br />COMPACTED FILL <br />TYPICAL <br />BENCHING <br />nFTAII A_A <br />BACKFILL <br />MINIMUM <br />— 4" MINIMUM APPROVED <br />PERFORATED PIPE** <br />(PERFORATIONS DOWN) <br />MINIMUM 2% GRADIENT <br />TO OUTLET <br />BENCH INCLINED <br />TOWARD DRAIN <br />TEMPORARY FILL LEVEL <br />MINIMUM 4" DIAMETER APPROVED <br />SOLID OUTLET PIPE <br />*FILTER ROCK TO MEET FOLLOWING <br />SPECIFICATIONS OR APPROVED EQUAL: <br />SIEVE SIZE <br />1" <br />Y <br />%11 <br />NO.4 <br />NO. 30 <br />NO. 50 <br />NO. 200 <br />NOT TO SCALE <br />PERCENTAGE PASSING <br />100 <br />90-100 <br />40-100 <br />25-40 <br />5-15 <br />0-7 <br />0-3 <br />TYPICAL BACKDRAIN DETAIL <br />I STANDARD SPECIFICATIONS FOR GRADING I <br />Page 22 of 26 <br />