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Group <br /> Primary Divisions Symbol/Graphic Typical Names <br /> • as <br /> COARSE GRAVELS CLEAN GW o o Well graded gravels, gravel-sand mixtures; <br /> GRAINED GRAVELS a a little or no fines <br /> SOILS half of ° ° <br /> coarse (less than Gp o o Poorly graded gravels or gravel-sand mixtures, <br /> more than fraction 5%fines) Q°o little or no fines <br /> half is larger larger than a o <br /> than#200 sieve <br /> sieve GRAVEL GM 00 0 Silty gravels, gravel-sand-silt mixtures <br /> WITH a <br /> FINES GC Clayey gravels, gravel-sand-clay mixtures <br /> SANDS CLEAN SW Well graded sands, gravelly sands, little or no fines <br /> half of SANDS <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 fess than 50% clays, sandy clays, silty clays, lean clays <br /> half is <br /> smaller than OLOrganic 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 <br /> more than 50% CH Inorganic clays of high plasticity, fat clays <br /> OHOrganic clays of medium to high plasticity, organic silts <br /> HIGHLY ORGANIC SOILS Pt IUU�i Peat and other highly organic soils <br /> PACIFIC Unified Soil <br /> ENVIRONMENTAL <br /> GROUP, INC Classification System <br />