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L <br /> MAJOR DIVISIONS SYMBOLS TYPICAL NAMES <br /> �. _ GRAVELS G W Well-gf°ded gravels or grovel-sand mixtures ,little or no floes <br /> J Z' GP Poorly graded <br /> � N N (More than 1/2 of gravels or gravel-sand mixtures , little or no fines <br /> o `o coarse fraction > GM Silty gravels , grovel -sand -silt mixtures <br /> _`w no. 4 sieve size) <br /> GC Clayey gravels , gravel-sand-clay mixtures <br /> to a o <br /> to salvos SW Well-graded sands or gravelly sands , little or no tines <br /> W <br /> cc o SP Poorly graded sands or gravelly sands , little or no fines <br /> < A (More than 1/2 of <br /> L V coarse fraction < SM Silty sands , sand-silt mixtures <br /> no. 4 sieve size) <br /> S C Clayey sands , sand-cloy mixtures <br /> rn ML Inorganic silts and very fine sands , rock flour , silty or CIO <br /> yey <br /> != d SILTS 8 CLAYS fine sands or clayey sits with Slight <br /> Plasticity <br /> o "=' Inorganic clays of low to medium plasticity <br /> N- 'n CL <br /> o n LL < 50 sandy clays , silty Clays , lean clays <br /> t gravelly cloys, <br /> L OL Organic silts and organic silty clays of low Plasticity <br /> -------------- <br /> Inorganic silts , micaceous or diatomaceous fine sandy or silty <br /> 0 N M H sails , elastic silts <br /> SILTS & CLAYS <br /> Lzo` C H Inorganic cloys of high Plasticity , (at clays <br /> Y LL > 50 0 H Organic clays of medium to high plasticity 9 P y , organic silt <br /> clay , organic silts Y <br /> LHIGHLY ORGANIC SOILS Pt Peat and other highly organic soils <br /> UNIFIED SOIL CLASSIFICATION SYSTEM— <br /> COHESIVE SOILS GRANULAR SOILS CLASSIFICATION RANGE OF GRAIN SIZES <br /> Description Blows/ft. Description Blows/f t. U.S. Standard Groin Size <br /> very soft < 2 very loose Sieve Size if, Millimeters <br /> < S <br /> �0 Boulders above 12" <br /> soft 2 - 4 loose S - = above 305 <br /> medium(firm) $ - 8 medium dense 11 - 30 Cobbles 12• to 3" 305 to 76.2 <br /> stiff 9 - 1 S <br /> Gravel 3" to no. 4 <br /> dense 76.2 to '4.76 <br /> 31 - 50 _coarse (C) 3" to 3/4" <br /> fine (f 76.2 to 19.1 <br /> very stiff 16 - 30 very dense > ) 3/4" to no. 4 <br /> SO 19.1 to 4.76 <br /> L hard > 30 - Sand no. 4 to no. 200 4.76 to 0.074 <br /> coarse (c) no. 4 to no. 10 4.76 to 2.00 <br /> CONSISTENCY CLASSIFICATION medium (m) no. 10 to no. 40 <br /> 2.00 to 0.420 <br /> fine (f) no. 40 to no. 200 <br /> 0.420 to 0.074 <br /> L60 Silt a Clay below no. 200 below 0.074 <br /> x ao GRAIN SIZE CLASSIFICATION <br /> LW <br /> O <br /> L 40 CH <br /> e V <br /> F30--___7 •P <br /> u <br /> ti 20 CL CH <br /> N <br /> i6 <br /> >L 170 __MH <br /> ♦ Cl-ML NL fl OL 1e <br /> OO 10 ZO 30 40 50 6o 70 Ito 90 too , [ <br /> LIOU10 LIMIT <br /> PLASTICITY CHART <br /> L <br />