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MAJOR DIVISIONS GRAPHIC LETTER TYPICAL DESCRIPTIONS SYMBOL SYMBOL GW Well-graded gravels,gravel-sand GRAVEL ANDmixtures, little or no fines GRAVELLY CLEAN GRAVELS �.r�.r�.��.r�.•�.•�.•• SOILS ■'■'.•.■..•.�.�. �;�;�;r�r�r�r• r•r••�.•?•?•?••r• Gp Poorly-graded gravels,gravel-sand A. mixtures, little or no fines ■ ■ ■ ■ ■ ■ ■ y ' GM Silty gravels,gravel-sand-silt Jo an 00 COARSE More than 50% of ::::::: mixtures GRAINED SOILS coarse fraction GRAVELS WITH retained on No. 4 FINES sieve GC Clayey gravels,gravel-sand-clay -� mixtures SW Well-graded sands,gravelly sands, little or no fines More than 50% of SAND AND CLEAN SAND material is larger SANDY SOILS (Little or no fines) lowthan No. 200 SP Poorly-graded sands, gravelly sieve size sands,little or no fines �r SM Silty sands,sand-silt mixtures More than 50% of SAND WITH FINES coarse fraction (appreciable passing No. 4 Sieve amount of fines) SC Clayey sands,sand-clay mixtures Inorganic silts and very fine sands, ML rock flour,silty or clayey fine sands or clayey silts with slight plasticity FINE-GRAINED LIQUID LIMIT Inorganic clays of low to medium SOILS LE S THAN 50 CL plasticity,gravelly clays,sandy clays, silty clays, lean clays IIIIIIII I I I I I I I I Organic silts and organic silty I I I I I I I I OL clays of low plasticity SILTS AND I I I I I I I I CLAYS Inorganic silty, micaceous, or MH diatomaceous fine sand or ..r silty soils More than 50% of LIQUID LIMIT CH Inorganic clays of high plasticity, material is smaller GREATER THAN 50 fat clays y than No. 200 sieve Size ` ` ` ` { ` ` f f • f fi i i Organic clays of medium to high irffiX OH plasticity, organic silts r yyrryr HIGHLY ORGANIC SOILS rrr,Yyy PT Peat, humus, swamp soils with yyyyy high organic contents ,.r Y.Y.Y.Y.Y.Y.Y. VARIOUS SOILS AND MAN MADE MATERIALS Fill Materials MAN MADE MATERIALS Asphalt and Concrete 40Earth Systems Consultants POmbo/Chevron SOIL CLASSIFICATION SYSTEM .0. Northern California Tracy, California Figure Al 6—