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MAJOR DIVISIONS USCS TYPICAL NAME <br /> SYMBOL <br /> WELL-GRADED GRAVELS,GRAVEL-SAND <br /> : + GW MIXTURES, LITTLE OR NO FINES <br /> GRAVELS CLEAN GRAVELS <br /> WITH LITTLE OR <br /> NO FINES • • POORLY-GRADED GRAVELS, GRAVEL-SAND <br /> GP <br /> MORE THAN HALF MIXTURES, LITTLE OR NO FINES <br /> . . <br /> COARSE FRACTION <br /> IS LARGER THAN SILTY GRAVELS, GRAVELSAND-SILT <br /> THE No. 200 SIEVE GRAVELS . . GM <br /> MIXTURES <br /> WITH OVER ' <br /> 12% FINES CLAYEY GRAVELS, GRAVEL-SAND-CLAY <br /> GC MIXTURES <br /> WELL-GRADED SANDS,SAND-GRAVEL <br /> SANDS CLEAN SANDS .:i .i .i SW MIXTURES WITH LITTLE OR NO FINES <br /> WITH LITTLE OR <br /> NO FINES POORLY GRADED SANDS, SAND-GRAVEL <br /> MIXTURES WITH LITTLE OR NO FINES <br /> MORE THAN HALF SP <br /> COARSE FRACTION <br /> IS SMALLER THAN SILTY SANDS, SAND-GRAVEL-SILT <br /> THE No. 200 SIEVE SANDS SNI MIXTURES <br /> WITH OVER <br /> 12% FINES Z5. CLAYEY SANDS, SAND-GRAVEL-CLAY <br /> MIXTURES <br /> INORGANIC SILTS&VERY FINE SANDS, <br /> ML 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 /> ORGANIC SILTS& ORGANIC SILTY CLAYS <br /> OL <br /> � l t OF LOW PLASTICITY <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 /> cu7 75 on rmCalifornia 9nAAvenue,Suite UNIFIED SOIL CLASSIFICATION SYSTEM <br /> IrviReference The United Sod Classdicatron System,Corps of Engineers,U.S.Army Technical Memorandum No.3-357 Vol I,March 1953.(revised April,1960) <br />