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NATURAL·GROUND n <br />COMPACTED FILL <br />6" MIN. - <br />V N <br />/ CLEANOUT EXCAVATION - <br />41. ... 6 <br />.t <br />>%43*20 d 78941*729 j <br />.4 <br />- FIRM NATIVE SOIUBEDROCK 24 MIN. <br />18" MIN. <br />1 <br />L <br />18" MIN. <br />MINUS 1" CRUSHED ROCK COMPLETELY <br />SURROUNDED BY FILTER FABRIC, OR <br />CLASS 11 PERMEABLE MATERIAL <br />4" MIN. <br />- 6" DIAMETER PERFORATED PIPE - MINIMUM 1% SLOPE <br />PIPE DEPTH OF FILL <br />MATERIAL OVER SUBDRAIN SCHEMATIC ONLY <br />ADS (CORRUGATED POLETHYLENE) 8 NOT TO SCALE <br />TRANSITE UNDERDRAIN 20 <br />PVC OR ABS: SDR 35 35 <br />SDR 21 100 <br />CANYON SUBDRAIN DETAIL <br />GRADING GUIDE SPECIFICATIONS <br />NOT TO SCALE <br />DRAWN: JAS <br />CHKD GKM <br />PLATE D-3 <br />SoCalGeo <br />V <br />SOUTHERN <br />CALIFORNIA <br />GEOTECHNICAL