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t.� <br /> i <br /> Unified Soil Classification System <br /> Croup <br /> Primary Divisions Symbol/Graphic Typical Names <br /> ° <br /> COARSE GRAVELS CLEAN IG jo Well graded gravels, gravel-sand mixtures; little or no fines <br /> �- GRAINED GRAVELS ° <br /> SOILS half of <br /> coarse � <br /> tractionse (loess than G P o Poorly graded gravels or gravel-sand mixtures; little or no <br /> - more than larger than 5 fines) a fines <br /> half is <br /> larger than #4 sieve ,° <br /> GRAVEL GM ° <br /> Silt <br /> gravels, gravel-sand-sift mixtures <br /> —9240 sieve WITH <br /> FINES GC. Clayey gravels, gravel-sand-clay mixtures <br /> SANDS CLEAN S try:?: Well graded sands, gravelly sands, little or no fines <br /> SANDS <br /> half of <br /> coarse (less than c <br /> i fraction 5% fines) SP P00dy graded sands or gravelly sands, little or no fines <br /> smaller <br /> - than ;a <br /> v sieve SANDS IS M Silty sands, sand-silt mixtures <br /> WITH ! :�: � <br /> -- FINES SC Clayey sands, sand-clay mixtures, plastic fines <br /> FINE SILTS AND CLAYS M I_ Inorganic silts and very fine sand, rock flour, silty or clayey <br /> —GRAINED tine sands or clayey silts, with slight plasticity ' <br /> SOILS liquid limit <br /> less than 30% C L V1 inorganic clays of low to medium plasticity, gravelly clays, <br /> — 1/{ sandy clays, silty clays, lean clays <br /> j more than <br /> half is O L Organic silts and organic silty clays of lowplasticity <br /> smaller <br /> i than #200 <br /> slava SILTS AND CLAYS M H 111 Inorganic silts, micaceous or diatomaceous fine sandy or silt} <br /> soils, elastic silts <br /> ` liquid limit <br /> s . <br /> more than 5041° C H Inorganic clays of high plasticity, fat clays <br /> O H Organic clays of medium to high plasticity, organic silts <br /> HIGHLY ORGANIC SOILSP ; +i'+ Peat and other highly organic soils_ <br /> Pacific Environmental Group, Inc. <br /> �I <br />