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UNIFIED SOIL CLASSIFICATION SYSTEM <br /> MAJOR DIVISIONS USCS TYPICAL <br /> SYMBOL DESCRIPTIONS <br /> a GW WELL-GRADED GRAVELS,GRAVEL-SAND <br /> CLEAN GRAVELS : MIXTURES WITH LITTLE OR NO FINES <br /> GRAVELS WITH LITTLE <br /> OR NO FINES <br /> °3 POORLY-GRADED GRAVELS,GRAVEL-SAND <br /> (More than half of o GP MIXTURES WITH LITTLE OR NO FINES <br /> t coarse fraction O <br /> lir is larger than <br /> the#4 sieve) GM SILTY GRAVELS,GRAVEL-SILT-SAND <br /> GRAVELS MIXTURES <br /> ` COARSE WITH OVER <br /> GRAINED 12% FINES CLAYEY GRAVELS,GRAVEL-SAND-CLAY <br /> SOILS GC MIXTURES <br /> L (More than half . SW WELL-GRADED SANDS,SAND-GRAVEL <br /> of material SANDS CLEAN-SANDS MIXTURES WITH LITTLE OR NO FINES <br /> is larger than WITH LITTLE — <br /> the#200 sieve) <br /> (More than half of OR NO FINES <br /> coarse fraction SP POORLY-GRADED SANDS,SANG-GRAVEL is smaller than MIXTURES WITH LITTLE OR NO FINES <br /> the#4 sieve) <br /> SM SILTY SANDS, SAND-GRAVEL-SILT MIXTURES <br /> SANDS WITH <br /> OVER 12% FINES <br /> SC CLAYEY SANDS,SAND-GRAVEL-CLAY MIXTURES <br /> INORGANIC SILTS&VERY FINE SANDS, <br /> ML SILTY OR CLAYEY FINE SANDS, <br /> CLAYEY SILTS WITH SLIGHT PLASTICITY <br /> SILTS AND CLAYSCL INORGANIC CLAYS OF LOW TO MEDIUM <br /> { PLASTICITY,GRAVELLY CLAYS,SANDY CLAYS, <br /> FINE (Liquid limit less than 50) SILTY CLAYS,LEAN CLAYS <br /> GRAINED — <br /> SOILS = OL ORGANIC SILTS&ORGANIC SILTY CLAYS <br /> OF LOW PLASTICITY <br /> (More than halfMI„{ INORGANIC SILTS,MICACEOUS OR <br /> of material DIATOMACEOUS FINE SAND OR SILT <br /> is smaller than III <br /> the#200 sieve) SILTS AND CLAYS <br /> CH INORGANIC CLAYS OF HIGH PLASTICITY, <br /> (Liquid limit greater than 50) FAT CLAYS <br /> OH ORGANIC CLAYS&ORGANIC SILTS <br /> OF MEDIUM-TO-HIGH PLASTICITY <br /> HIGHLY ORGANIC SOILS PT PEAT,HUMUS,SWAMP SOILS WITH HIGH <br /> ORGANIC CONTENT <br /> 1a <br /> 4 <br /> I <br /> UNIFIED SOIL CLASSIFICATION SYSTEM PLATE <br /> �� K L E I N F E L D E R177TT LIBERTY ROAD <br /> SAN JOAQUIN COUNTY, CALIFORNIA <br /> A-1 <br /> v Drafted By GDG Project No.: 36600.G01 <br /> L < Dale 10/1512003 File Number. ST03G236 <br /> Y <br /> Cgryy„MleinleYJe,.IM..+OUJ <br />