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MAJOR DIVISIONS USC$ TYPICAL NAME <br /> SYMBOL <br /> WELL-GRADED GRAVELS,GRAVEL-SAND <br /> :;.... GW <br /> GRAVELS CLEAN GRAVELS r r, MIXTURES, LITTLE OR NO FINES <br /> WITH LITTLE OR <br /> NO FINES ' ` POORLY-GRADED GRAVELS, GRAVEL-SAND <br />' MORE THAN HALF ' ' MIXTURES,LITTLE OR NO FINES <br /> COARSE FRACTION • • SILTY GRAVELS,GRAVELSAND-SILT <br /> IS LARGER THAN GRAVELS . . GM MIXTURES <br /> THE No.200 SIEVE WITH OVER F ' <br /> 12% FINES CLAYEY GRAVELS,GRAVEL-SAND-CLAY <br /> GC MIXTURES <br /> i ';1:•z;:x WELL-GRADED SANDS,SAND-GRAVEL <br /> SANDS CLEAN SANDS .iSzS:;z SW MIXTURES WITH LITTLE OR NO FINES <br /> WITH LITTLE OR <br />' NO FINES ^;'.A; POORLY GRADED SANDS,SAND-GRAVEL <br /> MORE THAN HALF "'" SP MIXTURES WITH LITTLE OR NO FINES <br /> COARSE FRACTION <br />' IS SMALLER THAN SILTY SANDS, SAND-GRAVEL-SILT <br /> THE No.200 SIEVE SANDS SM MIXTURES <br /> WITH OVER <br /> 12% FINES' SC CLAYEY SANDS,SAND-GRAVEL-CLAY MIXTURES <br /> INORGANIC SILTS&VERY FINE SANDS, <br /> M L SILTY OR CLAYEY FINE SANDS,CLAYEY <br /> SILTS AND CLAYS SILTS WITH SLIGHT PLASTICITY <br /> INORGANIC CLAYS OF LOW TO MEDIUM <br /> CL PLASTICITY,GRAVELLY CLAYS, SANDY <br /> ' LIQUID LIMIT LESS THAN 50 CLAYS SILTY CLAYS LEAN CLAYS <br /> ' I ' ORGANIC SILTS& ORGANIC SILTY CLAYS <br /> C L OF LOW PLASTICITY <br /> E I E <br /> MH ORGANIC SILTS,MICACEOUS OR <br /> SILTS AND CLAYS DIATOMACEOUS FINE SAND OR SILT <br /> ' CH INORGANIC CLAYS OF HIGH <br /> LIQUID LIMIT GREATER THAN 50 PLASTICITY, FAT CLAYS <br /> OH ORGANIC CLAYS&ORGANIC SILTS <br /> OF MEDIUM TO HIGH PLASTICITY <br /> HIGHLY ORGANIC SOILS PT PEAT, HUMUS, SWAMP SOILS <br /> WITH HIGH ORGANIC CONTENTS <br /> 1� <br /> ,3 CRC Eaviromnental Risk Management,Inc.17875 Von Karman Avenue,Suite 200 UNIFIED SOIL CLASSIFICATION SYSTEM <br /> Irvine,California 92714 <br /> ' Reference The United Soil Class4 cation System Corps of Engineers,U.S.Army Technical Memorandum No.3-357 Vol I,March 1963 (revised Apri1,1960) <br />