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' MAJOR DIVISIONS LETTER TYPICAL DESCRIPTION <br /> SYMBOL <br /> Clean GW Well-graded gravels,gravel-sand mixtures, little or no fines. <br /> ' GRAVELS Gravels(less <br /> than 5% <br /> J More than 50% fines) GP Poorly-graded gravels,gravel-sand mixtures,little or no fines. <br /> 0 N of coarse fraction <br /> is larger than No. GM Silty gravels,gravel-sand-silt mixtures,non-plastic fines. <br /> w (D > 4 sieve Gravels with <br /> Z �, fines <br /> Q E o GC Clayey gravels,gravel-sand-clay mixtures,plastic fines. <br /> ' <br /> -.2 0 <br /> U oO o Clean Sands SW Well-graded sands, sands with gravel, little or no fines. <br /> (n Z SANDS (less than <br /> MMore than 50% 5% fines) SP Poorly-graded sands, sands with gravel, little or no fines. <br /> ' O °' of coarse fraction <br /> U <br /> is smaller than SM Silty sands, sand-silt mixtures, non-plastic fines. <br /> No. 4 sieve Sands with <br /> fines <br /> ' SC Clayey sands, sand-clay mixtures,plastic fines. <br /> ML Inorganic silts, rock flour,clayey silts with slight plasticity. <br /> Cn <br /> SILTS AND CLAYS <br /> ° CL Inorganic clays of low to medium plasticity.(Lean clay)O T c) Liquid Limit is less than 50/o <br /> rn v >� <br /> OL Organic silts and organic clays of low plasticity. <br /> Z Eo <br /> ' o N <br /> � o o MH Inorganic silts, elastic. <br /> zM C: SILTS AND CLAYS <br /> z Liquid Limit is greater than 50% CH Inorganic clays of high plasticity.(Fat clay) <br /> 1 UL a, <br /> O OH Organic clays of high plasticity. <br /> ' HIGHLY ORGANIC SOILS PT Peat. <br /> DEFINITION OF TERMS AND SYMBOLS <br /> ' Standard Penetration 2"OUTSIDE DIAMETER SPILT SPOON SAMPLER <br /> LU Density Resistance in Blows/Foot <br /> J <br /> ' <br /> O Very Loose 0-4 2.4"INSIDE DIAMETER RING SAMPLER OR <br /> w Loose 4-10 SHELBY TUBE SAMPLER <br /> = Medium Dense 10-30 WATER LEVEL(Date) <br /> ' O Dense 30-50 <br /> Very Dense >50 Tr TORVANE READINGS,tsf <br /> Standard Penetration Pp PENETROMETER READING,tsf <br /> t <br /> W Consistancy Resistance in Blows/Foot <br /> DD DRY DENSITY, pounds per cubic foot <br /> U) Very Soft 0-2 <br /> W Soft 2-4 LL LIQUID LIMIT, percent <br /> O Medium Stiff 4-8 <br /> U Stiff 8-16 PI PLASTIC INDEX <br /> Very Stiff 16-32 <br /> Hard >32 N STANDARD PENETRATION,blows per foot <br /> 1 Terra UNIFIED SOIL CLASSIFICATION SYSTEM <br /> POWDERMILL BUSINESS CENTER <br /> Associates Ince EVERETT, WASHINGTON <br /> ' Consultants in Geotechnical engineering <br /> Geology and Pro No.T-6241 Date JUNE 2014 Fi ure A-1 <br /> Environmental Earth Sciences t• g <br />