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MAJOR DIVISIONS LETTER TYPICAL DESCRIPTION <br /> i SYMBOL <br /> Clean GW Well-graded gravels, gravel-sand mixtures, little or no <br /> GRAVELS Gravels fines. <br /> U3 ZU- <br /> .J co (less than Poorly graded gravels, gravel-sand mixtures, little or <br /> O N More than 5/o fines) GP P no fines. <br /> (n un 50% of coarse - <br /> 76 GMSilty gravels, gravel-sand-silt mixtures, non-plastic <br /> fraction is <br /> O , > Gravels fines. <br /> W larger than No. <br /> Z 'N 4 sieve with fines <br /> o GC Clayey gravels, gravel-sand-clay mixtures, plastic fines. <br /> 0 <br /> O N Clean <br /> to o SANDS Sands SW Well-graded sands, gravelly sands, little or no fines. <br /> (W 0Z (less than Poorly-graded sands or gravelly sands, little or no <br /> cr -c c More than 5% fines) SP fines. <br /> Q N L 50% of coarse <br /> O o fraction Is SM Silty sands, sand-silt mixtures, non-plastic fines. <br /> 0 g smaller than Sands <br /> No. 4 sieve with fines <br /> SC Clayey sands, sand-clay mixtures, plastic fines. <br /> Inorganic silts, rock flour, clayey silts with slight <br /> CO m o SILTS AND CLAYS ML plasticity. <br /> 0 Q1 N <br /> (q m CL Inorganic clays of low to medium plasticity, (lean clay). <br /> E o m Liquid limit is less than 50% <br /> 0 c Z N <br /> Z �'rn OL Organic silts and organic clays of low plasticity. <br /> ar <br /> Q C-C <br /> IY m SILTS AND CLAYS MH Inorganic silts, elastic. <br /> CD "-.9-Cu- <br /> W E CH Inorganic clays of high plasticity, fat clays. <br /> Z_ 0 w Liquid limit is greater than 50% <br /> LL' OH Organic clays of high plasticity. <br /> HIGHLY ORGANIC SOILS PT I Peat. <br /> DEFINITION OF TERMS AND SYMBOLS <br /> Standard Penetration 2" OUTSIDE DIAMETER SPLIT <br /> w Density Resistance in Blows/Foot T SPOON SAMPLER <br /> p Very loose 0-4 2.4" INSIDE DIAMETER RING SAMPLER <br /> Uj Loose 4-10 1 OR SHELBY TUBE SAMPLER <br /> Lu Medium dense 10-30 <br /> o Dense 30-50 Y WATER LEVEL (DATE) <br /> ci Very dense >50 <br /> Tr TORVANE READINGS, tsf <br /> Standard Penetration Pp PENETROMETER READING, tsf <br /> Consistency Resistance in [lows/Foot <br /> L.: CD DRY DENSITY, po.inds per cubic fool <br /> Very soft <br /> 0 2 <br /> w Soft LL LIQU 0 _tfr IT, percert <br /> 2-4 <br /> • <br /> Medium stiff 4-8 Pi PLASTIC INDEX <br /> 01 St? 8-16 <br /> Very stiff 16-32 N STANDARD PENETRATION, d,ows per foot <br /> iard >32 <br /> Terra UNIFIED SOIL CLASSIFICATION SYSTEM <br /> i,'" Associates, Inc. CITY LIGHTS <br /> EVERETT, WASHINGTON <br /> Consultants in Geotechnlcal Engineering <br /> Geology and <br /> Envlronmental Earth Sciences Proj. No. T-6001 Date DEC 2006 Figure A-1 <br />