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L 'MAJOR DIVISIONS SY SOLS COLOR TYPICAL NAMES <br /> CODE <br /> _ GRAVELS GW Well-groded gravels or gravel-sand mixtures , little or no fines <br /> GP Poorly graded grovels or gravel-sand mixtures , little or no fines <br /> LnMore than I/2 of <br /> 0 0 coarse fraction > G M Silty gravels gravel -sand -silt mixtures <br />�Z\ no. 4 sieve size) <br /> GC Clayey grovels , gravel-sand -clay mixtures <br /> _Q o <br /> to SANDS Still Well-graded sands or gravelly sands , little or no fines <br /> C) •••• ' <br /> � � c <br /> SP • . • '• Poorly graded sands or gravelly sands , little or no fines <br /> -Q (More than 1/2 of <br /> 6 - coarse fraction < SM o °o ° o o° Silty sands , sand -silt mixtures <br /> no. 4 sieve size) <br /> SIC Clayey sands sand-clay mixtures <br /> ML Inorganic silts and very fine sands , rock flour , silty or Clayey <br /> _j - fine sands or clayey silts with slight plasticity <br /> -' o SILTS Q CLAYS <br /> � �~ C L Inorganic clays of low To medium plasticity t gravelly clays, <br /> sandy clays , silty clays , lean clays <br /> o LL < 50 <br /> z� OL Organic silts and organic silty clays of low plasticity <br /> 1 aI 00 MH Inorganic silts , micaceous or diatomaceous fine sandy or silly <br /> SILTS 8 CLAYS soils , elastic silts <br /> w o CH Inorganic clays of high plasticity , fat clays <br /> 1 z <br /> LL > 50 OH Organic clays of medium to high plasticity , organic silty <br /> cloy , organic silts <br /> HIGHLY 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 I. U. S. Standard Grain Size <br /> Sieve Size in Millimeters <br /> very soft < 3 very loose < 5 <br /> Boulders above 12above 305 <br /> soft 3 -5 loose 5- 15 gobbles 12' to 3" 305 to 76.2 <br /> medium(firm) 6 -10 medium dense 16-40 Grovel 3" to no. 4 76.2 to 4.76 <br /> stiff 11 -20 dense 41- 65 coarse (c ) 3" to 3/4" 76.2 to 18.1 <br /> fine (f) 3/4' to no. 4 19.1 to 4.76 <br /> very stiff 21-40 very dense > 65 <br /> hard > 40 Sond no. 4 to no. 200 4.76 to 0.074 <br /> coarse (c) no. 4 to no. 10 4.76 to 2.00 <br /> medium (m) no. 10 to no. 40 2.00 to 0.420 <br /> CONSISTENCY CLASSIFICATION fine (f) no. 40 to no. 200 0.420 to 0.074 <br /> Silt a Clay below no. 200 below 0.074 <br /> 60 <br /> GRAIN SIZE CLASSIFICATION I <br /> y 60 I <br /> w CH <br /> 0 <br /> 4 0 <br /> E <br /> 30-- p N <br /> X I <br /> U •U <br /> 20 CL <br /> F I <br /> CH a E <br /> a 10 MH E <br /> O CL-ML NL B OL R �10 <br /> 0 10 20 30 40 50 60 TO 80 90 100 <br /> LIQUID LIMIT N <br /> G <br /> PLASTICITY CHART <br /> Qt%I �ulity �ontrol Insfxrtion <br />