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UNIFIED SOIL CLASSIFICATION SYSTEM <br /> PRIMARY DIVISIONS GROUP SECONDARY DIVISIONS <br /> SYMBOL <br /> Clean gravels (less GW Well graded gravel-sand mixtures, little or <br /> L C GRAVELS than 5% of fines) no fines. <br /> 0 <br /> A More than half of GP Poorly graded gravels or gravel-sand <br /> i <br /> R course fraction is mixtures, little or no fines. <br /> LS larger than No. 4 Gravel with fines GM Silty gravels or gravel-sand-silt mixtures, <br /> E sieve. with non-plastic fines. <br /> L R GC Clayey gravels or gravel-sand-clay mixtures, <br /> with plastic fines. <br /> A <br /> I Clean sands (less SW Well graded sands or gravelly sands, little <br /> N SANDS than 5% of fines) or no fines. <br /> E <br /> D More than half of SP Poorly graded sands or gravelly sands, little <br /> Lcourse fraction is or no fines. <br /> S smaller than No. 4 Sands with fines SM Silty sands or sand-silt mixtures, with non- <br /> O sieve. plastic fines. <br /> I <br /> L SC Clayey sands or sand-clay mixtures, with <br /> plastic fines. <br /> L ML Inorganic silts and very fine sands, rock <br /> F SILTS AND CLAYS flour, or clayey silts, with slight plasticity. <br /> I <br /> N Liquid Limit less than 50% CL Inorganic clays of low to medium plasticity, <br /> LE gravelly clays, sandy clays, silty clays, lean <br /> clays. <br /> G <br /> R OL Organic silts and organic silty clays of low <br /> D plasticity. <br /> I <br /> L N MH Inorganic silts, micaceous or diatomaceous <br /> E SILTS AND CLAYS fine sandy or silty soils, elastic silts. <br /> D <br /> L Liquid Limit greater than 50% CH Inorganic clays of high plasticity, fat clays. <br /> S <br /> 0 <br /> I OH Organic clays of medium to high plasticity, <br /> L organic silts. <br /> HIGHLY ORGANIC SOILS PT Peat and other highly organic soils. <br /> L <br /> LBORING LOG LEGEND <br /> ISampler Drive Interval 0 Relatively Undisturbed Sample Recovered and Preserved <br /> Sampler Driven, No Sample Recovery Disturbed Sample Recovered and Preserved <br />