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I <br /> IMAJOR DIVISIONS LETTER TYPICAL DESCRIPTION <br /> SYMBOL <br /> I Clean GW Well-graded gravels, gravel-sand mixtures, little or no <br /> GRAVELS Gravels tines. <br /> J (less than GP Poorly-graded gravels, gravel-sand mixtures, little or <br /> Ic N More than 5% fines) no fines. <br /> U7 �'cn 50% of coarse Silty gravels, gravel-sand-silt mixtures, non-plastic <br /> a m fraction is <br /> larger than No. Gravels GM tines. <br /> W ti <br /> I z .� 4 sieve with fines <br /> GC Clayey gravels, gravel-sand-clay mixtures, plastic fines. <br /> cc eo <br /> Clean SW Well-graded sands, gravelly sands, little or no fines. <br /> o SANDS Sands <br /> It_I_i <br /> C Z (less than Poorly-graded sands or gravelly sands, little or no <br /> r c More than 5% fines) SP fines. <br /> Q cd 50% of coarse :_ <br /> O a.)— fraction is SM Silty sands, sand-silt mixtures, non-plastic fines. <br /> IC-) <br /> g smaller than Sands <br /> No. 4 sieve with fines SC Clayey sands, sand-clay mixtures, plastic fines. <br /> I CO <br /> Inorganic silts, rock flour, clayey silts with slight <br /> ro M L plasticity. <br /> 0 <br /> —o a)o SILTS AND CLAYS <br /> CL Inorganic clays of low to medium plasticity, (lean clay). <br /> E o 0 Liquid limit is less than 50% --I <br /> LLJ o oc Z. OL Organic silts and organic clays of low plasticity. <br /> Z in cti a) <br /> `t Y azi MH Inorganic silts, elastic. <br /> I CC cti � i -- -O, cv SILTS AND CLAYS <br /> 1-1-1 ,73 <br /> CH Inorganic clays of high plasticity, fat clays. <br /> Z o Liquid limit is greater than 50% <br /> — <br /> E ` OH Organic clays of high plasticity. <br /> I <br /> HIGHLY ORGANIC SOILS PT Peat. <br /> IDEFINITION OF TERMS AND SYMBOLS <br /> co Standard Penetration T 2" OUTSIDE DIAMETER SPLIT <br /> I <br /> Ill <br /> Density Resistance in Blows/Foot L SPOON SAMPLER <br /> 0 Very loose 0-4 I 2.4" INSIDE DIAMETER RING SAMPLER <br /> cn Loose 4-10I OR SMELBY TUBE SAMPLER <br /> w0 <br /> Medium dense 10-30 <br /> s Dense 30-50 Y WATER LEVEL (DATE) <br /> Very dense >50 Tr TORVANE READINGS, tsf <br /> I uu Standard Penetration Pp PENETROMETER READING, tst <br /> Consistency Resistance in Blows/Foot DD DRY DENSITY, pounds per cubic foot I <br /> Very soft 0-2 LL LIQUID LIMIT, percent <br /> I wo <br /> Soft 2-4 <br /> = Medium stiff 4-8 PI PLASTIC INDEX <br /> Stiff 13 16 N STANDARD PENETRATION, blows per foot <br /> Very stiff 16-32 <br /> Hard >32 <br /> Terra UNIFIED SOIL CLASSIFICATION SYSTEM <br /> ' <br /> Associates, Inc. SEAWAY CENTER LOT 3C <br /> EVERETT, WASHINGTON <br /> Consultants In Geotechnical Engineering <br /> Geology and <br /> Environmental Earth Sciences Proj. No. T-5922-1 Date OCT 2007 Figure A-1 <br /> I <br />