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aF <br /> '1 Group <br /> Primary Divisions . Symbol/Graphic Typical Names <br /> .F <br /> COARSE GRAVELS CLEAN G O <br /> a o Well graded gravels,gravel-sand mixtures; <br /> GRAINED <br /> GRAVELS GW a O little or no fines <br /> SOILS half of 00 <br /> coarse c o <br /> fraction (less than GP 8 0 Poorly graded gravels or gravel-sand mixtures; <br /> more than 5%fines) 00 little or no fines <br /> half is larger Larger than 00 <br /> than#200 sieve 4 0 <br /> sieve GRAVEL GM ; a Silty gravels, gravel-sand-silt mixtures <br /> 00 <br /> WITH <br /> FINES GC Clayey gravels, gravel-sand-clay mixtures <br /> SANDS CLEAN SW Well graded sands, gravelly sands, little or no fines <br /> SANDS f <br /> halt of <br /> coarse (less than <br /> fraction 5%fines) SP Poorly graded sands or gravelly sands; little or no fines <br /> smaller <br /> than#4 i <br /> sieve SANDSSM Silty sands, sand-silt mixtures. 3 <br /> ' WITH i <br /> � F <br /> FINES SC Clayey sands, sand-clay mixtures, plastic fines <br /> FINE SILTS AND CLAYS ML Inorganic silts and very fine sand, rock flour, silty or <br /> GRAINED clayey fine sands or clayey silts, with slight plasticity <br /> SOILS = 'i <br /> liquid limit CL Inorganic clays of low to medium plasticity, gravelly F <br /> less than 50%,;i clays, sandy clays, silty clays, lean clays <br /> more than <br /> halt is <br /> smaller than OL Organic silts and organic silty clays of low plasticity <br /> #200 sieve <br /> SILTS AND CLAYS MH Inorganic silts, micaceous or diatomaceous fine sandy <br /> or silty sails, elastic silts <br /> liquid limit CH Inorganic clays of high plasticity:fat clays <br /> more than 5,0%1• <br /> OH Organic clays of medium to high plasticity, organic silts <br /> HIGHLY ORGANIC SOILSI Pt �*, Peat and other highly organic soils <br /> 10 <br /> PACIFIC <br /> Unified Soil <br /> 1 NVIRONMENTAL <br /> GROUP, INC. Classification System <br />