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#ified Soil Classification Syst6 Major Divisions Symbols ( Typical Names GW Well graded gravels or gravel-sand mixtures, little or no fines Gravels m GP Poorly graded gravels or gravel-sand mixtures, (Mora than halt of little or no fines 'n m coarse Iracticn> o no.4 slave size) GM Sandy gravels, gravel-sand-silt mixtures to o GC Clayey gravels, gravel-sand-clay mixtures c SW Well graded sands or gravelly sands, little or no fines m a Sands o SP Poorly graded sands or gravelly sands, little or no fines U E (More than halt of o coarse fraction < SM Silty sands, sand-silt mixtures E no.4 sieve size) SC Inorganic siits and very fine sands, rock flour silly or clayey fine sands or clayey silts with slight plasticity m ML Inorganic silts and very fine sands, rock flour, silty fine sands or clayey silts with slight plasticity �n Silts and Clays CL Inorganic clays of low to medium plasticity, gravelly .o $ LL- < 50 clays, sandy clays, lean clays (n N g OL Organic sifts and organic silty clays of low plasticity C: A Inorganic sifts, micaceous or diatomaceous fine sandy o MH or silty soils, elastic silts c = Silts and Clays CH Inorganic silts of high plasticity, fat clays L ' ILL= > 50 '— Organic clays of high plasticity, organic silty clays, E OH organic silts Highly Organic Soils Pt Peat and other highly organic soils Grain Size Chart Range of Grain Sizes Classification U.S,standard Grain Size Sieve Size in Millimeters Boulders Above 12' I Above 305 Cobbles 12'to 3- 305 to 76.2 Gravel 3'to No. 4 76.2 to 7.76 o0arse 3'to 31r 7.62m 4.76 Ane 3/4'to No.4 19.1 to 4.76 Sand No. 4 to No.200 4.76 to 0.074 coarse N0.4 to No.10 4.76 to 2.00 medium No.10 to No.40 2.00 to 0.420 fine I No.40 to No.200 0.420 to 0.074 Silt and Clay Below No.200 Below 0.074 CLASSIFICATION CHART TREAD LL AND ASSOCIATES,INC. Consulting Engineen and Scientists FIGURE 4