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UNIFIED SOIL CLASSIFICATION SYSTEM Major Divisions Symbols Typical Names C> GW Well-graded gravels or gravel-sand mixtures,little or no fines Gravels o °c (More than half of GP Poorly graded gravels or gravel-sand mixtures,little or no fines ' to ^ coarse fraction> GM Silty gravels,gravel-sand-silt mixtures m y N no 4 sieve size) mom GC Clayey gravels,gravel-sand-clay mixtures Ca! 0 SW Well-graded sands or gravelly sands,little or no fines mm Sands m (More than half of SP Poorly-graded sands or gravelly sands,little or no fines U i coarse fraction< SM Silty sands,sand-silt mixtures Eno 4 sieve size) E SC Clayey sands,sand-clay mixtures w o m ML Inorganic silts and clayey silts of low plasticity,sandy silts,gravelly silts o w N Silts and Clays Cf- Inorganic clays of low to medium plasticity,N ° m LL=<50 g Y p ty,gravelly clays,sandy clays,lean clays L m OL Organic silts and organic silt-clays of low plasticity c N U o MH Inorganic silts of high plasticity w m o Silts and Clays CH Inorganic clays of high plasticity,fat clays c_ a c LL=>50 LLE v OH Organic silts and clays of high plasticity Highly Organic Soils PT Peat and other highly organic soils SAMPLE DESIGNATIONS/SYMBOLS GRAIN SIZE CHART Sample taken with split-barrel sampler other than Standard Range of Grain Sizes ® Penetration Test sampler Darkened area indicates soil recovered Classification U S Standard Grain Size ® Classification sample taken with Standard Penetration Test Sieve Size In Millimeters sampler Boulders Above 12" Above 305 Cobbles 12"to 3" 305 to 76 2 m Undisturbed sample taken with thin-walled tube ! Gravel 3"to No 4 76 2 to 4 76 coarse 3 to 314" 76 2 to 191 fine 3/4 to No 4 19 1 to 4 76 Disturbed sample ' Sand No 4 to No 200 4 76 to 0 074 coarse No 4 to No 10 4 76 to 2 00 Sampling attempted with no recovery medium No 10 to No 40 2 00 to 0 420 fine No 40 to No 200 0 420 to 0 074 Silt and Clay Below No 200 1 Below 0 074 m Core sample Unstabilized groundwater level Analytical laboratory sample Stabilized groundwater level ® Sample taken with Direct Push sampler SAMPLER TYPE C Core barrel PT Pitcher tube sampler using 3 0-inch outside diameter, thin-walled Shelby tube ! CA California split-barrel sampler with 2 5-inch outside diameter and a 1 93 inch inside diameter S&H Sprague&Henwood split-barrel sampler with a 3 0-inch outside diameter and a 2 43-inch inside diameter D&M Dames&Moore piston sampler using 2 5 inch outside ' diameter,thin-walled tube SPT Standard Penetration Test(SPT)split-barrel sampler with a 2 0-inch outside diameter and a 1 5-inch inside diameter O Osterberg piston sampler using 3 0-inch outside diameter,thin walled Shelby tube ST Shelby Tube(3 0-inch outside diameter,thin-walled tube) ' advanced with hydraulic pressure 541 WEST" GRANT LINE ROAD Tracy, California CLASSIFICATION CHART ! [Date 11/26/03 Project No 3577 01 Figure A-28