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Letter Symbol <br />GW <br />GP <br />GM <br />GC <br />SW <br />SP <br />SM <br />SC <br />ML <br />CL <br />OL <br />MH <br />CH <br />OH <br />PT <br />Silty sands, sand-silt mixtures <br />Inorganic clays of low to medium plasticity, gravelly <br />clays, sandy clays, silty clays, lean clays. <br />Unified Soil Classification System <br />Clayey sands, sandy-clay mixtures. <br />Description <br />Silts and Clays <br />Liquid Limit greater than <br />50% <br />Gravels <br />With Fines <br />Clean Sands <br />Major Divisions <br />Clean <br />Gravels <br />GravelsMore than ½ coarse fraction retained on the No. 4 sieveInorganic clays of high plasticity, fat clays. <br />Well-graded sands and gravelly sands, little or no <br />fines. <br />Poorly-graded sands and gravelly sands, little or no <br />fines. <br />Consistency Classification <br />Highly Organic SoilsCoarse-grained SoilsMore than ½ retained on the No. 200 SieveFine-grained SoilsMore than ½ passing through theNo. 200 SieveSands With <br />Fines <br />Silts and Clays <br />Liquid Limit less than <br />50% <br />Organic clays of medium to high plasticity. <br />Peat, muck, and other highly organic soils. <br />Organic clays of medium to high plasticity. <br />Inorganic silts, micaceous or diatomaceous fines <br />sands or silts, elastic silts. <br />Description - Blows Per Foot (Corrected) Description - Blows Per Foot (Corrected) <br />Well-graded gravels and gravel-sand mixtures, <br /> little or no fines. <br />Poorly-graded gravels and gravel-sand mixtures, little <br />or no fines. <br />Silty gravels, gravel-sand-silt mixtures. <br />Clayey gravels, gravel-sand-clay mixtures. <br />Cohesive SoilsGranular SoilsSandsMore than ½ passing through the No. 200 sieveInorganic silts, very fine sands, rock flour, silty or <br />clayey fine sands. <br />MCS <br /><5 <br />5 ¯15 <br />16 ¯40 <br />41 ¯65 <br />>65 <br />SPT <br /><4 <br />4 ¯10 <br />11 ¯30 <br />31 ¯50 <br />>50 <br />Very loose <br />Loose <br />Medium dense <br />Dense <br />Very dense <br />Very soft <br />Soft <br />Firm <br />Stiff <br />Very Stiff <br />Hard <br />MCS <br /><3 <br />3 ¯5 <br />6 ¯10 <br />11 ¯20 <br />21 ¯40 <br />>40 <br />SPT <br /><2 <br />2 ¯4 <br />5 ¯8 <br />9 ¯15 <br />16 ¯30 <br />>30 <br />MCS = Modified California Sampler SPT = Standard Penetration Test Sampler