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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(less <br /> GRAVELS than 5% <br /> Co More than 50% fines) GP Poorly-graded gravels,gravel-sand mixtures, little or no fines. <br /> O co N of coarse fraction <br /> Cl) T6 F' is larger than No. GM Silty gravels,gravel-sand-silt mixtures, non-plastic fines. <br /> o as a) 4 sieve Gravels with <br /> z m •3 fines <br /> E O GC Clayey gravels,gravel-sand-clay mixtures, plastic fines. <br /> r o N <br /> O too Clean Sands SW Well-graded sands, sands with gravel,little or no fines. <br /> U) a Z SANDS . (less than <br /> Q - c More than 50% 5%fines) Sp Poorly-graded sands, sands with gravel, little or no fines. <br /> O � }' of coarse fraction <br /> 0 o <br /> is smaller than Sands with SM Silty sands,sand-silt mixtures, non-plastic fines. <br /> No. 4 sieve fines <br /> SC Clayey sands, sand-clay mixtures, plastic fines. <br /> 1 <br /> ML Inorganic silts, rock flour,clayey silts with slight plasticity. <br /> Ws <br /> co E. N SILTS AND CLAYS <br /> p Liquid Limit is less than 50% CL Inorganic clays of low to medium plasticity. (Lean clay) <br /> co <br /> O T' vo—i OL Organic silts and organic clays of low plasticity. <br /> 1.0 z Eo <br /> zt o MH Inorganic silts,elastic. <br /> O c Z SILTS AND CLAYS <br /> z Liquid Limit is greater than 50% CH Inorganic clays of high plasticity. (Fat clay) <br /> s <br /> LL i v -- <br /> o OH Organic clays of high plasticity. <br /> HIGHLY ORGANIC SOILS PT Peat. <br /> DEFINITION OF TERMS AND SYMBOLS <br /> N Standard Penetration I 2"OUTSIDE DIAMETER SPILT SPOON SAMPLER <br /> w <br /> W Density Resistance in Blows/Foot <br /> Z 7 2.4" INSIDE DIAMETER RING SAMPLER OR <br /> O Very Loose 0-4 SHELBY TUBE SAMPLER <br /> Loose 4-10 <br /> = Medium Dense 10-30 y WATER LEVEL(Date) <br /> O Dense 30-50 <br /> ✓ Very Dense >50 <br /> Tr TORVANE READINGS,tsf <br /> Standard Penetration Pp PENETROMETER READING,tsf <br /> W Consistancy Resistance in Blows/Foot <br /> W DD DRY DENSITY, pounds per cubic foot <br /> Ww Very Soft 0-2 <br /> Soft 2-4 LL LIQUID LIMIT,percent <br /> IO Medium Stiff 4-8 <br /> 0 Stiff 8-16 PI PLASTIC INDEX <br /> Very Stiff 16-32 <br /> Hard >32 N STANDARD PENETRATION, blows per foot <br /> Terra UNIFIED SOIL CLASSIFICATION SYSTEM <br /> kips Associates Inc.ellAMORRES ERICA <br /> WASHINGTON <br /> Consultants in Geotechnical engineering <br /> Geology and Pro No.T-7364 Date FEB 2016 Figure A-1 <br /> Environmental Earth Sciences 1• g <br />