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(VT/ PG/u c)s MAJOR DIVISIONS GRAPHIC LETTER TYPICAL DESCRIPTIONS SYMBOL SYMBOL GW Well-graded gravels,gravel-sand GRAVEL AND mixtures, little or no fines GRAVELLY CLEAN GRAVELS SOILS 'r;'.;'. ;';'.r;'r.' GP Poorly-graded gravels,gravel-sand +y+;iyry?,iyry' mixtures, little or no fines GM Silty gravels, gravel-sand-silt 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) Poorly-graded sands, gravelly than No.200 SP 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 Inorganic silts and very fine sands, ML rock flour,silty or clayey fine sands or clayey silts with slight plasticity Inorganic clays of low to medium FINE-GRAINED LIQUID LIMIT SOILS LESS THAN CL plasticity,gravelly clays,sandy clays,silty clays,lean clays 1111111 1 1 1 1 1 1 1 Organic silts and organic silty 1 1 1 1 1 1 1 OL clays of low plasticity SILTS AND CLAYS Inorganic silty, micaceous, or MH diatomaceous fine sand or silty soils More than 50%of LIQUID LIMIT CH Inorganic clays of high plasticity, material is smaller GREATER THAN 50 fat clays than No. 200 r r r r r r r sieve Size rrrrrrr rrrrrrr OH Organic clays of medium to high rrrrrrr plasticity, organic silts 77777777, rrrrrrr Peat, humus, swamp soils with HIGHLY ORGANIC SOILS y1 y1X1 y1yyJ' PT yyyyyyy high organic contents yJ'yJ'J'yJ' VARIOUS SOILS AND MAN MADE MATERIALS Fill Materials MAN MADE MATERIALS Asphalt and Concrete � ., Earth Systems Consultants Lathrop Effluent SOIL CLASSIFICATION SYSTEM Percolation Ponds ' '/ Northern California Figure 1 Lathrop, California g