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I , <br /> MAJOR DIVISIONS j LETTER TYPICAL DESCRIPTION <br /> ISYMBOL <br /> Clean GW , Well-graded gravels, gravel-sand mixtures, little or no <br /> GRAVELS Gravels fines.a) <br /> I J (less than i G P Poorly-graded gravels, gravel-sand mixtures, little or <br /> O co N More than 5% fines) no fines. — <br /> u) ..'w # 50% of coarse Silty gravels, gravel-sand-silt mixtures, non-plastic <br /> • fraction is Gravels ; GM fines. <br /> i a a) I larger than No. <br /> zcu.— 4 sieve with fines <br /> _ GC Clayey gravels, gravel-sand-clay mixtures, plastic fines. <br /> oCNI <br /> a Clean Well-graded sands <br /> O `n SANDS Sands g , gravelly sands, little or no fines. <br /> cZ (less than Poorly-graded sands or gravelly sands, little or no <br /> c c More than 5la fines) P fines. <br /> Q '" co S0% of coarse <br /> o fraction is SM Silty sands, sand-silt mixtures, non-plastic fines. <br /> U g smaller than Sands <br /> — -- No 4 sieve with fines -- —— <br /> SC Clayey sands, sand-clay mixtures, plastic fines. <br /> Inorganic silts, rock flour, clayey silts with slight <br /> ar a SILTS AND CLAYS Alplasticity. <br /> O °+r' <br /> N al CL Inorganic clays of low to medium plasticity, (lean clay). <br /> E Z a) Liquid limit is less than 50% I<.: <br /> oGI ni OL Organic silts and organic clays of low plasticity. <br /> I <br /> Z 8 cco <br /> MN Inorganic silts, elastic. <br /> 0 Z a�.y SILTS AND CLAYS <br /> I T CH <br /> Inorganic clays of high plasticity, fat clays. <br /> W ° E <br /> Z Liquid limit is greater than 50% �. _..—_M. <br /> a: OH Organic clays of high plasticity. <br /> I -_ _ M <br /> HIGHLY ORGANIC SOILS PT Peat. <br /> I DEFINITION OF TERMS AND SYMBOLS <br /> 1 <br /> w Standard Penetration <br /> w ! Density Resistance in Blows/Foot I 2 OUTSIDE DIAMETER SPLIT <br /> _ SPOON SAMPLER <br /> i <br /> I 2 <br /> 0 I Very loose 0-4 2.4" INSIDE DIAMETER RING SAMPLER <br /> vy Loose 4-10 ._ OR SHELBY TUBE SAMPLER <br /> Ell Medium dense 10-30 <br /> I _ It WATER LEVEL DATE <br /> Dense 30-50 (DATE) <br /> 0 Very dense >50 <br /> Tr TORVANE READINGS, tsf <br /> I Et Standard Penetration Pp PENETROMETER READING, tsf <br /> Consistency Resistance in Blows/Foot DD DRY DENSITY, pounds per cubic foot <br /> } Very soft 0-2 LL LIQUID LIMIT, percent <br /> tui Soft 2-4 <br /> z Medium stiff 4-8 PI PLASTIC INDEX <br /> o VI <br /> stiff 1 8-1 32 N STANDARD PENETRATION, blows per foot <br /> il L Hard >32 <br /> Terra UNIFIED SOIL CLASSIFICATION SYSTEM <br /> NORPRO BUILDING B <br /> i <br /> Associates, Inc. EVERETT, WASHINGTON <br /> Consultants in Geotechnical Engineering <br /> Geology and <br /> Environmental Earth Sciences Proj. No. T-6578 Date JUN 2011 Figure A-1 <br />