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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 /> J rn More than 50% fines) GP Poorly-graded gravels,gravel-sand mixtures, little or no fines. <br /> O c6 N of coarse fraction <br /> N To `n is larger than No. GM Silty gravels,gravel-sand-silt mixtures, non-plastic fines. <br /> >a9 4 sieve Gravels with <br /> iu Z u a) fines <br /> E o GC Clayey gravels,gravel-sand-clay mixtures, plastic fines. <br /> o � <br /> N <br /> 0 o Clean Sands SW Well-graded sands,sands with gravel, little or no fines. <br /> U) m Z SANDS (less than <br /> IX More than 50% 5%fines) SP Poorly-graded sands,sands with gravel, little or no fines. <br /> O o -' of coarse fraction <br /> V M is smaller than SM Silty sands,sand-silt mixtures, non-plastic fines. <br /> No.4 sieve Sands with <br /> fines SC Clayey sands,sand-clay mixtures, plastic fines. <br /> 45 ML Inorganic silts, rock flour, clayey silts with slight plasticity. <br /> To <br /> U) ci)E a).� SILTS AND CLAYS <br /> p To Liquid Limit is less than 50% CL Inorganic clays of low to medium plasticity. (Lean clay) <br /> G '� OL Organic silts and organic clays of low plasticity. <br /> III Eo <br /> 0 <br /> d IS o MH Inorganic silts,elastic. <br /> 0 c Z SILTS AND CLAYS <br /> Z 03 L Liquid Limit is greater than 50% CH Inorganic clays of high plasticity. (Fat clay) <br /> 0 OH Organic clays of high plasticity. <br /> 2 <br /> HIGHLY ORGANIC SOILS PT Peat. <br /> DEFINITION OF TERMS AND SYMBOLS <br /> U) Standard Penetration <br /> co Density Resistance in Blows/Foot 2"OUTSIDE DIAMETER SPILT SPOON SAMPLER <br /> -J <br /> Z I 2.4" INSIDE DIAMETER RING SAMPLER OR <br /> O Very Loose 0-4 SHELBY TUBE SAMPLER <br /> to Loose 4-10 <br /> W Medium Dense 10-30 <br /> _ y WATER LEVEL(Date) <br /> O Dense 30-50 <br /> O Very Dense >50 <br /> Tr TORVANE READINGS,tsf <br /> Standard Penetration Pp PENETROMETER READING,tsf <br /> W Consistancy Resistance in Blows/Foot <br /> > DD DRY DENSITY, pounds per cubic foot <br /> ro Very Soft 0-2 <br /> w Soft 2-4 LL LIQUID LIMIT, percent <br /> IO Medium Stiff 4-8 <br /> V 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 /> BAYWOOD INDUSTRIAL <br /> kseI i Associates, Inc. EVERETT, WASHINGTON <br /> Consultants in Geotechnical Engineering <br /> Geology and <br /> Environmental Earth Sciences Proj.No.T-8221 Date: OCT 2020 Figure A-1 <br />