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til .to J Unified Soil Classification System Major Divisions Symbols Typical Names GW Well-graded gravels or gravel-sand mixtures, Gravels little or no fines N GP Poorly-graded gravels or gravel-sand mixtures, N (More than half of little or no fines y > coarse fraction s e N no 4 sieve size) GM Silty gravels, gravel-sand-silt mixtures � $ c0 GC Clayey gravels,gravel-sand-clay mixtures ca _^ C7 SW Well-graded sands or gravelly sands, little or no fines y o O Sands 0SP Poorly-graded sands or gravelly sands, little or no fines (More than half of o coarse fraction< SM Silty sands, sand-silt mixtures no 4 sieve size) SC Clayey sands, sand-clay mixtures N ML Inorganic silts and very fine sands, rock flour, silty in fine sands or clayey silts with slight plasticity v+ (n' Silts and Clays CL Inorganic clays of low to medium plasticity, gravelly 68 LL — < 50 clays,sandy clays, lean clays OL Organic silts and organic silty clays of low plasticity V MH inorganic silts, micaceous or diatomaceous fine sandy C? or silty soils,elastic silts m m Silts and Clays LZ c° LL — 50 CH Inorganic clays of high plasticity, fat clays OH Organic clays of high plasticity,organic silty clays, -- I 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" Above 305 Cobbles 12"to 3" 305 to 76 2 Gravel 3"to No 4 76 2 to 4 76 coarse 3"to 314" 76 2 to 191 fine 314"to No 4 19 1 to 4 76 Sand No 4 to No 200 4 76 to 0 074 coarse No 4 to No 10 4 76 10 200 medium No 10 to No 40 2 00 to 0 424 fine No 40 to No 200 0 420 to 0 074 Silt and Clay Below No 200 Below 0 074 411 INDUSTRIAL WAY Tracy, California CLASSIFICATION CHART TREADWELL & ROLLO, INC. Consulting Engineers and Scientists Project No 110707 Figure 4