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Primary Divisions Group Symbol <br /> and Graphic Typical Names <br /> COARSE GRAVELS CLEAN GW Well graded gravels, gravel-sand mixtures, <br /> GRAINED GRAVELS little or no fines <br /> SOIL half of coarse (less than 5%fines) Poorly graded gravels or gravel-sand mixture <br /> fractions GP little or no fines <br /> more than half larger than <br /> is larger than #4 sieve <br /> #200 sieve GRAVEL GM Silty gravel, gravel-sand-silt mixture <br /> with <br /> FINES <br /> GC Clayey gravel, gravel-sand-clay mixture <br /> CLEAN SW Well graded sand, gravelly sand, <br /> SANDS SANDS little or no fines <br /> half of coarse (less than 5%fines) S P Poorly graded sand, gravelly sand, <br /> fraction is little or no fines <br /> smaller than <br /> #4 sieve SANDS SM Silty sand, sand-silt mixture <br /> with <br /> FINES SC Clayey sand, sand-clay mixture <br /> ML Inorganic sift and very fine sand,rock flour, <br /> FINE SILTS AND CLAYS silty or clayey fine sand or clayey silt <br /> slight plastiGity <br /> GRAINED liquid limit<50% �� Inorganic clay of low to medium plasticity,graveily clay <br /> SOIL sandy clay,silty clay lean clay <br /> more than half Organic sift and organic silty clay of low plasticity <br /> is smaller than <br /> �I'- <br /> #200 sieve <br /> Inorganic sift, micaceous or diatomaceous fine sandy or <br /> SILTS AND CLAYS MH silty soils elastic silts <br /> liquid limit X50°,6 <br /> CH <br /> Inorganic clay of high plasticity fat clay <br /> OH Organic clay of medium to high piasticrty organic silt <br /> HIGHLY ORGANIC SOILS PT Peat and other highly organic soil <br /> UNIFIED SOIL <br /> Touchstone CLASSIFICATION SYSTEM <br /> Developments <br /> Environmental Managernent <br />