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• <br />• <br />r <br />3 <br />w <br />U <br />O <br />Z <br />W <br />n. <br />0 <br />IL <br />w <br />UNIFIED SOIL CLASSIFICATION SYSTEM <br />(From ASTM D 2488.93 & 2487 -93) <br />MAJOR DIVISIONS <br />GRSYMBO L ATIC <br />SYMBO <br />TYPICAL DESCRIPTION <br />GW <br />o o <br />Well- Graded Gravels, Gravel -Sand <br />Clean Gravels <br />Mixtures, Little or No Fines <br />Gravels <br />(less than <br />5% fines) <br />Poorly Graded Gravels, Gravel -Sand <br />(more than 50% <br />GP <br />Mixtures, Little or No Fines <br />of coarse <br />Gravels with <br />GM <br />Silty Gravels, Gravel- Sand -Silt Mixtures <br />fraction retained <br />on No. 4 sieve) <br />Fines (more <br />GC <br />Clayey Gravels, Gravel-Sand-Clay <br />Coarse - Grained <br />than 12% fines) <br />Soils (more than <br />Mixtures <br />SW <br />Well- Graded Sands, Gravelly Sands, <br />50% retained on <br />No. 200 sieve) <br />Clean sands <br />Little or No Fines <br />Sands <br />(less than <br />SP <br />Poorly Graded Sand, Gravelly Sands, <br />(50% or more <br />5% fines) <br />of coarse <br />Little or No Fines <br />Sands with <br />SM <br />Silty Sands, Sand -Silt Mixtures <br />(use Dual Symbols <br />for 5 - 12% Fines <br />fraction <br />passes the <br />(i.e. GP -GM)) 1D <br />No. 4 sieve) <br />Fines (more <br />than 12% fines) <br />SC <br />Clayey Sands, Sand -Silt Mixtures <br />Inorganic Silts of Low to Medium <br />ML <br />Plasticity, Rock Flour, or Clayey Silts <br />Silts and Clays <br />Inorganic <br />With Slight Plasticity <br />Inorganic Clays of Low to Medium <br />(liquid limit <br />less than 50) <br />CL <br />Plasticity, Gravelly Clays, Sandy Clays, <br />Fine - Grained Soils <br />Silty Clays, Lean Clays <br />Organic <br />OL <br />= <br />Organic Silts and Organic Silty Clays of <br />(50% or more <br />passes the <br />= <br />Low Plasticity <br />No. 200 sieve) <br />Inorganic Clays of Medium to High <br />CH <br />Plasticity, Sandy Fat Clay, Gravelly Fat Clay <br />Silts and Clays <br />Inorganic <br />Inorganic Silts, Micaceous or Diatomaceous <br />(liquid limit <br />50 or more) <br />MH <br />Fine Sands or Silty Soils, Elastic Silt <br />Or ganic <br />OH <br />� <br />Organic Clays Sm to <br />H igh <br />p asticity, Organic i is <br />Highly Organic <br />Primarily organic matter, dark in <br />PT <br />Peat, Humus, Swamp Soils with High <br />Soils <br />color, and organic odor <br />Organic Content (See D 4427 -92) <br />NOTES <br />1. Dual Symbols (symbols separated by a hyphen, i.e., SP -SM, <br />slightly silty fine SAND) are used for soils with between 5% <br />and 12% fines or when the liquid limit and plasticity index <br />values plot in the CL -ML area of the plasticity chart. <br />2. Borderline symbols (symbols separated by a slash, i.e., <br />CUML, silty CLAY /clayey SILT; GW /SW, sandy <br />GRAVEUgravelly SAND) indicate that the soil may fall into <br />one of two possible basic groups. <br />Revision No.: PR -03 <br />