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MAJOR DIVISIONS GRAPHIC LER9RR TYPICAL DESCRIPTIONS SYMBOL SYMBOL GW Well-graded gravels,gravel-sand GRAVEL AND mixtures,little or no fines GRAVELLY CLEAN GRAVELS ••r••r•r••r••r••r••r• SOILS ...,...•.•...•. •■.•r.•r.•r.•r.•r.•r. •'••'••'••'••'••'••'•• Poorly-graded raded ravels, ravel-sand GP Y 9 9 9 :A ;i:;?A. mixtures, little or no fines ■ ■ ■ ■ ■ ■ ■ GM Silty gravels,gravel-sand-silt COARSE More than 50% of J.s s an J 0 mixtures GRAINED SOILS coarse fraction GRAVELS WITH retained on No. 4 FINES sieve GC Clayey gravels, gravel-sand-clay w 4y mixtures vv S 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) than No. 200 SP Poorly-graded sands,gravelly sieve size sands,little or no fines 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 ..r Inorganic silts and very fine sands, ML rock flour,silty or clayey fine sands ti or clayey silts with slight plasticity FINE-GRAINED LIQUID LIMIT Inorganic clays of low to medium SOILS LESS THAN 50 CL plasticity,gravelly clays, sandy -� clays,silty clays, lean clays IIIIIIII I I I I I I I I OL Organic silts and organic silty 1 1 1 1 1 1 1 I clays of low plasticity r SILTS AND I I I I I I I I CLAYS Inorganic silty, micaceous,or MH diatomaceous fine sand or 6.r silty soils More than 50% of LIQUID LIMIT Inorganic clays of high plasticity, material is smaller GREATER THAN 50 CH fat clays �+ than No. 200 l sieve Size OH Organic clays of medium to high plasticity,organic silts •.;,Y.Y.Y.Y.Y HIGHLY ORGANIC SOILS 'Y`Y`Y`Y`Y`Y PT Peat,humus, swamp soils with Y'Y_Y`Y`Y`Y high organic contents VARIOUS SOILS AND MAN MADE MATERIALS Fill Materials V MAN MADE MATERIALS Asphalt and Concrete ( � Earth Systems Consultants Corral Hollow SOIL CLASSIFICATION SYSTEM Northern Callfomia Tracy, California Figure Al