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N-0011 <br /> MAJOR DIVISIONS SYMBOLS TYPICAL NAMES <br /> _r <br /> GRAVELS GW well-graded gravels or gravel—sand mixtures , <br /> no floes <br /> +.r 8 d GP Poorly graded gravels or gravel—sand mixtno fines(More than I/2 of <br /> a o coarse fraction GM Silty gravels gravel -sand -silt mixtures <br /> no. 4 sieve size) <br /> GC Clayey gravels , gravel-sand -clay mixtu'X CUc9 `� SANDSSW Well-graded sands or gravelly sands , lies- <br /> 0cSP Poorly graded sands or gravelly sands fines <br /> a A (More than 1/2 of <br /> 0— coarse fraction < SM Silty sands , sand -silt mixtures <br /> U <br /> no. 4 sieve size) <br /> SC Clayey sands , sand-clay mixtures ! <br /> r M L Inorganic silts and very fine sands , rock flour , silty or clayey i <br /> fine sands or clayey silts with slight plasticity <br /> -' SILTS Q CLAYS <br /> C) N~_ CL Inorganic clays of low to medium plasticity , gravelly clays, <br /> N w a sandy clays , silty clays , lean clays <br /> o0 , LL < 50 <br /> uj Z`\„ OL Organic silts and organic silty clays of low plasticity <br /> rat c o M H Inorganic silts , micaceous or diatomaceous fine sandy or silty <br /> `D —" SILTS a CLAYS soils elastic silts <br /> Z o` c CH Inorganic clays Of high plasticity , fat clays <br /> y LL � 50 Organic clays of medium to high Plasticity <br /> r OH <br /> 9 P y , organic silty <br /> clay , organic silts <br /> HIGHLY ORGANIC SOILS Pt Peat and other highly organic soils <br /> v <br /> UNIFIED SOIL CLASSIFICATION SYSTEM <br /> COHESIVE SOILS GRANULAR SOILS CLASSIFICATION RANGE OF GRAIN SIZES <br /> Description Blows/ft. Description Blows/ff. U.S. Standard Grain Size <br /> Sieve Size in Millimeters <br /> very soft < 2 very loose < 5 Boulders above 12" _ above 305 <br /> soft 2 — 4 loose 5 — 10 Cobbles <br /> 12" to 3" 305 to 76.2 <br /> medium(firm) 5 - 8 medium dense 11 - 30 <br /> Gravel to no. 4 '76.2 to '4.76 <br /> stiff 9 - 15 dense 31 - 50 coarse (c) 3" to 3/4" 76.2 to 19.1 <br /> fine (f) 3/4" to no. 4 19.1 to 4.76 <br /> very stiff 16 - 30 very dense > 56 <br /> hard > 30Sand 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 <br /> medium (m) no. 10 to no. 40 2.00 to 0.420 <br /> fine (f) no. 40 to no. 200 0.420 to 0.074 <br /> 60 Silt & Clay below no. 200 below 0.074 <br /> x 50 <br /> GRAIN SIZE CLASSIFICATION <br /> o c11 <br /> a 4O <br /> .p <br /> 30 <br /> r- <br /> u <br /> ►- 2O CL CH <br /> V) <br /> r a 10 MH <br /> 4 CL-ML ML a OL <br /> OO 10 20 30 40 50 60 TO 80 90 100 <br /> LIOU10 LIMIT <br /> PLASTICITY CHART <br />