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I <br /> MAJOR DIVISIONS LETTER SYMBOL TYPICAL DESCRIPTION <br /> Clean GW Well-graded gravels,gravel-sand mixtures, little or no fines. <br /> Gravels(less <br /> GRAVELS than 5% <br /> co :5 More than 50% fines) GP Poorly-graded gravels,gravel-sand mixtures, little or no fines. <br /> O co ) of coarse fraction <br /> Cl) To `I) is larger than No. GM Silty gravels,gravel-sand-silt mixtures, non-plastic fines. <br /> Iw <br /> •m 4sieveGravels with <br /> ku <br /> fines <br /> GC Clayey gravels,gravel-sand-clay mixtures, plastic fines. <br /> eo o <br /> N <br /> yILI Z SANDS Clean Sands SW Well-graded sands,sands with gravel, little or no fines. <br /> (less than <br /> Q s More than 50% 5%fines) Sp Poorly-graded sands, sands with gravel, little or no fines. <br /> I 0 o of coarse fraction <br /> 0 2 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 /> m ML Inorganic silts, rock flour,clayey silts with slight plasticity. <br /> To co E m <br /> w .N SILTS AND CLAYS ° CL Inorganic clays of low to medium plasticity. (Lean clay) <br /> I 5To N Liquid Limit is less than 50% <br /> G co m 75 OL Organic silts and organic clays of low plasticity. <br /> Z Eo <br /> I g o N LO Q . <br /> MH Inorganic silts,elastic. <br /> O c Z SILTS AND CLAYS <br /> w Liquid Limit is greater than 50% CH Inorganic clays of high plasticity.(Fat clay) <br /> LL 2 — <br /> o OH Organic clays of high plasticity. <br /> HIGHLY ORGANIC SOILS PT Peat. <br /> IDEFINITION OF TERMS AND SYMBOLS <br /> Cl)III Standard Penetration 2"OUTSIDE DIAMETER SPILT SPOON SAMPLER <br /> w <br /> w Density Resistance in Blows/Foot <br /> p Very Loose 0 4 7 2.4"INSIDE DIAMETER RING SAMPLER OR <br /> II SHELBY TUBE SAMPLER <br /> W Loose 4-10 <br /> = Medium Dense 10-30 y WATER LEVEL(Date) <br /> O Dense 30-50 <br /> I V 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 /> xVery <br /> Lu Soft Soft 2 4 LL LIQUID LIMIT, percent <br /> 0 Medium Stiff 4-8 <br /> 0III 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 /> ,`���\ RIVERSIDE BUSINESS PARK LOTS 5 AND 6 <br /> � 1115 Associates, Inc. EVERETT, WASHINGTON <br /> Consultants in Geotechnical Engineering <br /> Geology and Proj. No.T-7388 Date MAR 2016 Figure A-1 <br /> Environmental Earth Sciences g <br /> I <br />