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Group <br /> Primary Divisions Symbol/Graphic Typical Names <br /> . O 6 <br /> COARSE GRAVELS CLEAN GW ¢o Well graded gravels,gravel-sand mixtures, <br /> GRAINED GRAVELS 00 little or no fines <br /> SOILS half of <br /> coarse a o <br /> fraction (less than Gp o a Poorly graded gravels or gravel-sand mixtures, <br /> more than 5%fines) 00 little or no fines <br /> half is larger larger than <br /> Sieve a o <br /> than#200 #4 <br /> Silty gravels, gravel-sand-silt mixtures <br /> sieve GRAVEL GM 00 <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 <br /> half 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 <br /> sieve SANDS SM Silty sands, sand-silt mixtures <br /> WITH <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 <br /> liquid limit CL Inorganic clays of low to medium plasticity, gravelly <br /> more than less than 5011/6 days,sandy days, silty clays, lean clays <br /> half 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 soils, elastic silts <br /> liquid limit CH Inorganic clays of high plasticity,fat clays <br /> more than 50% <br /> OH Organic clays of medium to high plasticity, organic silts <br /> HIGHLY ORGANIC SOILS Pt Peat and other highly organic sods <br /> PACIFIC Unified Soil <br /> ENVIRONMENTAL <br /> GROUP,INC Classification System <br />