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AWL Allik <br /> Unified Soil Classification System <br /> Major Divisions Symbols Typical Names <br /> GW Well graded gravels or gravel-sand mixtures, <br /> little or no fines <br /> Gravels <br /> m GP Poorly graded gravels or gravel-sand mixtures, <br /> " <br /> (More than half of little or no fines <br /> y > coarse fraction> <br /> 92 <br /> 'o no.4 sieve size) GM Sandy gravels,gravel-sand-silt mixtures <br /> d g GC Clayey gravels,gravel-sand-clay mixtures <br /> .E C. <br /> cc — <br /> (� Syy Well graded sands or gravelly sands, little or no fines <br /> � o <br /> r Sands <br /> 0 = SP Poorly graded sands or gravelly sands, Tittle or no fines <br /> (More than half of <br /> m coarse traction. <br /> E M Silty sands, sand-silt mixtures <br /> no.4 sieve size) S <br /> SC Inorganic silts and very fine sands, rock flour silty <br /> or clayey fine sands or clayey silts with slight plasticity <br /> m ML Inorganic silts and very fine sands, rock flour,silty <br /> fine sands or clayey sills with slight plasticity <br /> rn m Silts and Clays CL Inorganic clays of low to medium plasticity, gravelly <br /> N LL= <50 clays,sandy clays, lean clays <br /> d c OL Organic sifts and organic silty clays of low plasticity <br /> C _A <br /> ` $ MH Inorganic silts, micaceous or diatomaceous fine sandy <br /> or silty soils, elastic silts <br /> C_ t <br /> Silts and Cl CH Inorganic silts of high plasticity,fat clays <br /> LLL LL= > 50 <br /> E OH Organic clays of high plasticity, organic silty clays, <br /> organic sifts <br /> Highly Organic Soils Pt Peat and other highly organic soils <br /> Grain Size Chart <br /> Range of Grain Sizes <br /> Classification U.S.Standard Grain Size <br /> Sieve Size in Millimeters <br /> Boulders Above 12" Above 305 <br /> Cobbles 12"to 3" 305 to 76.2 <br /> Gravel 3"to No. 4 76.2 to 7.76 <br /> coarse 3'to 3/4' Z62 to 4.76 <br /> fine 3/4'to No.4 19.1 l0 4.76 <br /> Sand No. 4 to No.200 4.76 to 0.074 <br /> coarse No.4 to No.10 4.76 to 2.00 <br /> medium No.10 to No.40 2.00 to 0.420 <br /> fine No.40 to No.200 0.420 to 0.074 <br /> Silt and Clay Below No. 200 Below 0.074 <br /> 575 INDUSTRIAL PARK DRIVE <br /> Manteca, California CLASSIFICATION CHART <br /> TREADWELL AND ROLLO INC. <br /> Consulting Engineers and Scientists Project No. 1107A2 Figure 4 <br />