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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 /> Poorly-graded gravels or gravel-sand mixtures, <br /> " GP <br /> �+ (More than halt of little or no fines <br /> 0 > coarse fraction> <br /> o y no 4 sieve size) GM Silty gravels,gravel-sand-silt mixtures <br /> GC Clayey gravels, gravel-sand-clay mixtures <br />' a <br /> t7 N SW Well-graded sands or gravelly sands,little or no fines <br /> i a Sands <br />' SP Poorly-graded sands or gravelly sands, little or no fines <br /> 0 CU <br /> (More than half of <br /> 2 coarse fraction c <br /> no 4 sieve size)no Silty sands, sand-silt mixtures <br /> ISC Clayey sands, sand-clay mixtures <br /> N ML Inorganic silts and very fine sands, rock flour,silty <br />' fine sands or clayey silts with slight plasticity <br /> w �; Silts and Clays CL Inorganic clays of tow to medium plasticity,gravelly <br /> 58 LL c 50 clays,sandy clays, lean clays <br /> N N <br /> M <br /> a OL Organic silts and organic silty clays of low plasticity <br /> Inorganic silts, micaceous or diatomaceous fine sandy <br /> o MH or silty soils,elastic silts <br /> Silts and Clays <br /> ir r LL — 50 CH Inorganic clays of high plasticity, fat clays <br /> E OH Organic clays of high plasticity,organic silty clays, <br /> organic silts <br /> Highly Organic Soils Pt Peat and other highly organic soils <br /> r <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 4 76 <br /> coarse 3"to 314" 76 2 to 19 1 <br /> rine 314"to No 4 19 1 to 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 /> ISilt and Clay Below No 200 Below 0 074 <br /> 411 INDUSTRIAL WAY <br /> Tracy, California CLASSIFICATION CHART <br /> TREADWELL & ROLLO, INC. <br /> Consulting Engineers and Scientists Protect Na 1107 07 Figure 4 <br />