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<br /> <br />UNIFIED SOIL CLASSIFICATION SYSTEM <br />(From ASTM D 2488-93 8 2467-93) <br />MAJOR DIVISIONS GROUP/GRM~iIC <br />SYMBOL (37 rypICAL DESCRIPTION <br /> <br />Clean Grevels <br />GW ~ <br />° ~ ° Well-G2tled Gravels, GravelSand <br /> <br />(less than Matures, Little or No Fines <br /> 5%fines) ~ ~ Poorty Greded Gravels, Greve4SarM <br /> mare Nan 50% <br />( <br />of coarse GP ~ Mixtures, Little or No Fines <br /> <br /> (rectlon retained Grevels with GM Silty Grevels, GrevelSand-Siff Matures <br /> on No. 4 sieve) Fines (more <br />Coarse-G21netl than 12%fines) GC Clayey Grevels, Grevel-Sand-Clay <br />Soils (more than Mixtures <br />50%retained on <br />N <br />200 <br />i <br />Cl <br />d <br />0 <br />SW WeIFGreded Sands, Gravelly Sends, <br />o. <br />s <br />eve) <br />S <br />d ean san <br />s <br />l <br />th Little or No Fines <br /> an <br />s <br />(50%ar more an <br />( <br />ess <br />5%fines) <br />SP - <br />~ <br />Poody Gretled Sang Grevelty Sands, <br /> o/coarse Little or No Fines <br />(use Dual Symhols <br />fors-12%Fines fre°fi°n <br />passes the <br />Sands wiNO <br />SM <br />Silly Sands, SandSllt Mixtures <br /> 4 sieve) <br />No Fi <br />(l.e. GP-GM)) 1Q . nes (more <br /> than 12%fines) SC Clayey Sands, Sand-Siff Maures <br /> Inorganic Silts of Low to Medium <br /> ML Plasticity, Rock Flour, or Clayey Silts <br /> Sills and Clays Inorganic Wth Slight Plasgdty <br /> (liquitl limit Inorganic Clays of Low b Medium <br /> less than 50) CL Plasticity, Gravelly Clays, Sandy Clays, <br />Fine-Grained Soils Silty Clays, Lean Clays <br />(50%or more <br />Organic <br />OL = Organic Silts and Organic Silty Clays of <br />passes the _- <br />- Low PlasllGty <br />No. 200 slave) Inorganic Clays of Medium to High <br /> <br />Inor <br />anic CH Plastlcky, Sandy Fat Clay, Gravelly fat Clay <br /> Silts and Clays g <br /> (liquid IimR MH Inorganic SIILS, Micaceous or Diatomaceous <br /> 50 or more) Fine Sands or Silty Soils, Elastic Silt <br /> Organic OH ///j Organic Clays of Medium to High <br /> // Plasticity, Organic Silts <br />Highly Organic Pdmady organic matter, dark In <br />PT Peat, Humus, Swamp Soils with High <br />Soils color, and organic ooor Organic Content (See D4427-92) <br />NOTES <br />1. Dual Symbols (symbols separated by a hyphen, i.e., SP-SM, <br />slightly silty foe SAND) are used for soils with between b% <br />and 12% foes or when the liquid limit and plasticity index <br />values plot in the CL-ML area of the plasticity chart. <br /> <br />2. Bordedine symbols (symbols separated by a slash, i.e., <br />CUML, silty CLAY/clayey SILT; GW/SW, sandy <br />GRAVEVgravelly SAND) indicate that the soil may fall into <br />one of two possible basic groups. <br />