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k � <br /> SAMPLE CLASSIFICATION CHART <br /> UNIFIED SOIL CLASSIFICATION SCHEME <br /> MAJOR DIVISIONS SYMBOLS GRAPHIC TYPICAL NAMES <br /> COLUMN <br /> Well-graded gravels and gravel-sand mixtures, little <br /> CO GRAVELS GW or no fines <br /> _ Poorly-graded gravels or gravel-sand mixtures, <br /> U) (More than 1/2 of GP little or no fines <br /> 00 coarse fraction > GM <br /> uJ Silty gravels, gravel-sand-silt mixtures <br /> Z T m no. 4 sieve size) <br /> �¢ nGC Clayey gravels, gravel-sand-clay mixtures <br /> J-_ <br /> C:) Well-graded sands or gravelly sands,'little or no <br /> SANDS SW fines <br /> cc 0 SID Poorty-graded sands or gravelly sands, little or <br /> O (More than 1/2 atno fires <br /> 0 coarse fraction <br /> no. 4 sieve size) SM Silty sands, sand silt mixtures <br /> SC Clayey sands, sand-clay mixtures <br /> Inorganic silts and very fine sands, rock flour, silty or <br /> 0 _ SILTS& CLAYS ML clayey fine sands or clayey silts with slight plasticity <br /> N CL Inorganic clays of low to medium plasticity,gravelly <br /> U) a "' LL c 50 clays, sandy clays, silty clays, lean clays <br /> a� <br /> � <br /> N °' OL Organic silts and organic silty clays of low plasticity <br /> � w cMH Inorganic silts, micaceous or diatomaceous fine <br /> C0 �, N SILTS & CLAYS sandv or silty soils elastic silts <br /> UjL Z �c LL> 50 CH Inorganic clays of high plasticity, fat clays <br /> LL v <br /> OH Organic clays of medium to high plasticity, organic <br /> silty clays, organic silts <br /> y HIGHLY ORGANIC SOILS Pt Peat and other highly organic soils <br /> CLASSIFICATION MODIFIERS <br /> } GRAIN SIZE CLASSIFICATION <br /> TRACE 0- 10% <br /> LITTLE 10 -20% CLASSIFICATION RANGE OF GRAIN SIZES <br /> ' SOME 20-35% U.S Standard Grain Size <br /> AND 35-50% Sieve Size in Millimeters <br /> ± MODIFIERS BOULDERS Above 12" Above 305 <br /> PLASTICITY CHART COBBLES 12" to 3" 305 to 76.2 <br /> 60 <br /> 50 GRAVEL 3"to No. 4 76.2 to 4.76 <br /> Lu z ��(c) 3/4' <br /> 40 fine <br /> to No.4 19.1 to 4.76 <br /> 30 SAND No. 4 to No. 200 4.76 to 0.074 <br /> coarse(c) No.4 to No. 10 4.76 to 2.00 <br /> 20 a medium(m) No. 10 to No.40 2.00 to 0.420 <br /> 00" CH <br /> •A•Line fine (f) No.40 to Na 200 0.420 to 0.074 <br /> 5 � <br /> 0 <br /> &I SILT&CLAY Bebw N <br /> 10 o. 200 Bebw 0.074 <br /> EEIZ <br /> 0 10 20 30 40 50 60 70 80 90 100 <br /> LIQUIDLtMlr Woodward-Clyde Consultants AdEAk <br /> L <br />