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AI <br /> Group <br /> Primary Divisions Symbol/Graphic Typical Names <br /> COARSE GRAVELS CLEAN GW o o Well graded gravels, gravel-sand mixtures, <br /> GRAINED GRAVELS 00 little or no fines <br /> ° ° <br /> SO]LS half of <br /> coarse 10 <br /> (less than GP 00 Poorly graded gravels or gravel-sand mixtures, <br /> more than fraction 5%fines) 0°p little or no fines <br /> half is larger larger than o fl <br /> than#200 sieve o <br /> sieve GRAVEL GM 00 Silty gravels, gravel-sand-silt mixtures <br /> 0101 <br /> WITH 00 <br /> FINES GC Clayey gravels, gravel-sand-day mixtures <br /> SANDS CLEAN <br /> SANDS SW Well graded sands, gravelly sands, little or no fines <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-day 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 50% clays, sandy clays, silty days, lean clays <br /> half is <br /> smaller than OL Organic sifts and organic silty clays of low plasticity <br /> #200 sieve <br /> SILTS AND CLAYS MH Inorganic sifts, 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 r# Peat and other highly organic soils <br /> A <br /> 1i <br /> PACIFIC ENVIRONMENTAL Unified Soil <br /> GROUP, INC Classification System <br />