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I <br /> MAJOR DIVISIONS LETTER 1 FR <br /> SYMBOL <br /> TYPICAL DESCRIPTION <br /> I <br /> Clean GW Well-graded gravels, gravel-sand mixtures, little or no <br /> GRAVELS Gravels fines. <br /> _ to (less than GP Poorly-graded gravels, gravel-sand mixtures, little or <br /> I O cn N More than 5% fines) <br /> GM no fines. <br /> Cn �'w 50% of Coarse <br /> fraction is Silty gravels, gravel-sand-silt mixtures, non-plastic <br /> w • as larger than No. Gravels fines. <br /> Z nl•� 4 sieve with fines <br /> IZ o GC Clayey gravels, gravel-sand-clay mixtures, plastic fines. <br /> O P N Clean SW Well-graded sands, gravelly sands, little or no fines. <br /> o SANDS Sands <br /> I W as Z (less than Poorly-graded sands or gravelly sands, little or no <br /> More than 5/o fines) SP fines. <br /> CCcd Q ci).c 50% of coarse - <br /> O o" fraction is SM Silty sands, sand-silt mixtures, non-plastic fines. <br /> I U g smaller than No. 4 sieve Sands <br /> Wlth fines SC Clayey sands, sand-clay mixtures, plastic fines. <br /> inorganic silts, rock flour, clayey silts with slight <br /> IJ • 0 SILTS AND CLAYS M�' plasticity. <br /> O ,-N CL Inorganic clays of low to medium plasticity, (lean clay). <br /> CO E o m Liquid limit is less than 50% <br /> ID o Z N OL Organic silts and organic clays of low plasticity. <br /> Q ="' 8 MH Inorganic silts, elastic. <br /> I 0 -c SILTS AND CLAYS <br /> in m CH Inorganic clays of high plasticity, fat clays. <br /> Z ° ai Liquid limit is greater than 50% --- . <br /> OH Organic clays of high plasticity. <br /> 1 <br /> HIGHLY ORGANIC SOILS PT Peat. <br /> IDEFINITION OF TERMS AND SYMBOLS <br /> cn Standard Penetration I w <br /> cn 2° OUTSIDE DIAMETER SPLIT <br /> Density Resistance in Blows/Foot I SPOON SAMPLER <br /> ZO Very loose 0-4 2.4` INSIDE DIAMETER RING SAMPLER <br /> 05 Loose 4-10 I OR SHELBY TUBE SAMPLER <br /> at Medium dense 10-30 <br /> I _ Dense 30-50 1 WATER LEVEL (DATE) <br /> Very dense >50 Tr TORVANE READINGS, tsf <br /> I w Standard Penetration Pp PENETROMETER READING tsf <br /> Consistency Resistance in Blows/Foot DD DRY DENSITY, pounds per cubic foot <br /> Very soft 0-2 LL LIQUID LIMIT, percent <br /> w Soft 2-4 <br /> Medium stiff 4-8 P1 PLASTIC INDEX <br /> Stiff 8-16 N STANDARD PENETRATION, blows per foot <br /> Very stiff 16-32 <br /> Hard >32 <br /> • <br /> I Terra UNIFIED SOIL CLASSIFICATION SYSTEM <br /> Associates, Inc. INTERMEC SITE <br /> EVERETT, WASHINGTON I <br /> Consultants In Geotechnical Engineering <br /> Geology and <br /> Environmental Earth Sciences Proj. No. T-6241 Date AUG 2008 Figure A-1 <br />