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Group <br /> Primary Divisions Symbol/Graphic Typical Names <br /> oo <br /> COARSE GRAVELS CLEAN GW . 00 Well graded gravels, gravel-sand mixtures; <br /> 00 <br /> GRAINED GRAVELS 0 0 little or no fines <br /> O 0 <br /> SOILS half of <br /> coarse (less than (3Po a Poorly graded gravels or gravel-sand mixtures; <br /> more than fraction 5%fines) o o <br /> larger tlittle or no fines <br /> than o 0 <br /> half is larger #4 sieve 0 0 <br /> than #200 GRAVEL GM 0 0 Silty gravels, gravel-sand-silt mixtures <br /> 00 <br /> sieve 00 <br /> WITH <br /> FINES GC Clayey gravels, gravel-sand-day 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 /> sieveSANDS SMTI: <br /> Silty sands, sand-silt mixtures <br /> WITH <br /> FINES SC - Clayey sands, sand-clay mixtures, plastic fines <br /> - <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 /> less than 50% clays, sandy clays, silty clays, lean clays <br /> more than <br /> half is OL Organic silts and organic silty clays of low plasticity <br /> smaller than <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 /> �• <br /> HIGHLY ORGANIC SOILS Peat and ocher highly organic soils <br /> PACIFIC Unified Soil <br /> ENVIRONMENTAL <br /> GROUP, INC. Classification System <br />