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, <br /> 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 <br /> ,_ than 5% ; <br /> J 0 More than 50% fines) GP Poorly-graded gravels,gravel-sand mixtures,little or no fines. <br /> O m N of coarse fraction <br /> N m rn is larger than No. GM Silty gravels,gravel-sand-silt mixtures,non-plastic fines. <br /> a� a) 4 sieve Gravels with <br /> z . Q a fines <br /> GC Clayey gravels, gravel-sand-clay mixtures,plastic fines. <br /> o cp <br /> N <br /> 14, o Clean Sands SW Well-graded sands, sands with gravel, little or no fines. <br /> COLU coZ SANDS (less than <br /> < „ m More than 50% 5%fines) Sp Poorly-graded sands,sands with gravel, little or no fines. <br /> O 4 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 /> CD- ML Inorganic silts, rock flour,clayey silts with slight plasticity. <br /> Ta <br /> SILTS AND CLAYS <br /> –1 to .co ° CL Inorganic clays of low to medium plasticity.(Lean clay) <br /> Ts.O _ wLiquid Limit is less than 50% <br /> G m 'v OL Organic silts and organic clays of low plasticity. <br /> Z E o r <br /> MH Inorganic silts,elastic. <br /> nz <br /> 0 = SILTS AND CLAYS <br /> Lu m ° CH Inorganic clays of high plasticity.(Fat clay) <br /> }. <br /> Z L Liquid Limit is greater than 50% <br /> o OH Organic clays of high plasticity. <br /> M <br /> HIGHLY ORGANIC SOILS PT Peat. <br /> DEFINITION OF TERMS AND SYMBOLS <br /> N <br /> Standard Penetration T 2"OUTSIDE DIAMETER SPILT SPOON SAMPLER <br /> uj Density Resistance in Blows/Foot <br /> —J <br /> Z <br /> Very Loose 0-4 2.4" INSIDE DIAMETER RING SAMPLER OR <br /> O Loose 4-10 — SHELBY TUBE SAMPLER <br /> = Medium Dense 10-30 y WATER LEVEL(Date) <br /> O Dense 30-50 <br /> v Very Dense >50 <br /> Tr TORVANE READINGS,tsf <br /> Standard Penetration Pp PENETROMETER READING,tsf <br /> insistancy Resistance in Blows/Foot DD DRY DENSITY,pounds per cubic foot <br /> w Soft Soft 2-4 LL LIQUID LIMIT, percent <br /> I <br /> O Medium Stiff 4-8 <br /> o 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 /> **"."��° Associates! Inc. SEAWAY CENTER <br /> EVERETT, WASHINGTON <br /> '* • Consultants in Geotechnical Engineering <br /> EnvironmentalGeologand Pro No.T-7342 Date JAN 2016 Figure A-1 <br /> Earth Sciences 1• 9 <br />