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Unified Soil Classification System <br /> Group <br /> Primary Divisions Symbol/Graphic Typical Names <br /> a <br /> COARSE GRAVELS CLEAN G o Well graded gravels, gravel-sand mixtures; little or no fines <br /> GRAINED GRAVELS a .. <br /> SOILS halt of c <br /> coarse (less than G p c Poorly graded gravels ,.)r gravel-sand mixtures; little or no <br /> more than fraction 5% fines) G fines <br /> half is larger than o a <br /> larger than #4 sieve GRAVEL G M o Silty gravels, gravel-sand-silt mixtures <br /> #200 sieve WITH o 0 <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) S P : ' Poorly graded sands or gravelly sands, little or no fines <br /> smaller <br /> than 94 S M Silty sands, sand-silt mixtures <br /> sieve SANDS <br /> WITH <br /> FINES SC Clayey sands, sand-clay mixtures, plastic fines <br /> FINE SILTS AND CLAYS M L Inorganic silts and very fine sand, rock flour, silty or clayey <br /> fine sands or clayey silts, with slight plasticity ' <br /> GRAINED <br /> SOILS liquid limit CL Inorganic clays of low to medium plasticity, gravelly clays, <br /> less than 50% sandy clays, silty clays, lean clays <br /> more than <br /> half is JH Organic sills and organic silty clays of low plasticity <br /> smaller <br /> than #�20o SILTS AND CLAYS Inorganic silts, micaceous or diatomaceous fine sandy or silt) <br /> sieve soils, elastic silts <br /> liquid limit <br /> more than 50% Inorganic clays of high plasticity, fat clays <br /> organic clays of medium to high plasticity, organic sills <br /> HIGHLY ORGANIC SOILS P t Q** Peat and other highly organic soils _ <br /> Pacific Environmental Group, Inc. <br />