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Unified Soil Classification System <br /> Well graded gravels or gravel sand mixtures, <br /> GW <br /> • little or no fines <br /> Poorly graded gravels or gravel-sand mixtures <br /> o Gravels G P little or no fines <br /> °-' (More ifian half of <br /> coarse fraction> f GM Sandy gravels, gravel-sand-sift mixtures <br /> 0" no 4 sieve size) h <br /> (no <br /> cz GC Clayey gravels, gravel-sand-silt mixtures <br /> l`C y <br /> 0-6 SW Well graded sands or gravelly sands, little or no fines <br /> as <br /> cin t <br /> oa.. m <br /> r Sands SP Poorly graded sands or gravelly sands, little or no fines <br /> U m (More than half of <br /> o coarse fraction< E I I <br /> E no 4 neve size) i i l i l l l SM Silty sands,sand-silt mixtures <br /> I <br /> SC Inorganic silts and very fine sands, rock flour, silty <br /> or clayey fine sands or clayey sifts with slight plasticity <br /> ML Inorganic tfine <br /> sands. <br /> ot r, silty <br /> fnands or cla ey siswith slight plasticity <br /> o Sifts and Clays CL Inorganic clays of low to medium plasticity, gravelly <br /> o LL y <50 clays sandy clays, lean clays <br /> Wo r <br /> 'a V0 Organic silts and organic silty clays of low plasticity <br /> a� <br /> co <br /> y <br /> 1CaoInorganic silts, micaceous or diatomaceous fine sandy <br /> C3 Mt1 or silty soils, eleastic silts <br /> Silts and Clays <br /> cm <br /> LL => 50 CH Inorgan-c silts of high plasticity, fat days <br /> OHOrganic clays of high plasticity,organic silty clays <br /> organic silts i <br /> I <br /> Highly Organic Soils Pt Peat and other highly organic soils <br /> Grain Size Chart Sample Designation <br /> Flange of Grain Sizes <br /> Classification U S Standard Gain Size Drive Sample Interval <br /> Seive Size in Millimeters <br /> Boulders Above 12" Above 305 <br /> Cobbles 12"to 3- 305 to 76 2 Continuous Core <br /> Sample Interval <br /> Gravel 3"to No 4 76 2 to 7 76 <br /> coarse 3-to 3W 76 2 to A 76 <br /> rine 314-to No 4 191 to 4 76 Fust Encountered Water(during drilling) <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 40 200 too 420 Stabilized Water Elevation (7/1191) <br /> fine No 40 to No 200 0 420 to 0 074 <br /> Silt and Clay Below No 200 Below 0 074 <br /> S EAC O R Figure A-1 <br />