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L �kw 1�4j <br /> LMAJOR DIVISIONS SYMBOLS TYPICAL NAMES <br /> GRAVELS GW Wel!-graded gravels or grovel-sand mixtures ,tittle or no fines <br /> �= m <br /> LN= GP Poorly graded gravels or gravel-sand mixtures , little or no fines <br /> N w (More than I/2 of <br /> a ? coarse fraction y GM Silty grovels , gravel -sand-silt mixtures <br /> ,u o no. 4 sieve size) <br /> Z GC Clayey gravels , gravel-sand--clay mixtures <br /> 4 Q <br /> C"7N SANDS SW Wel!-graded sands or gravelly sands , little or no fines <br /> j ¢ c SP Poorly graded sands or gravelly Bonds , tittle or no fines <br /> Q 0 A (More than 1/2 of <br /> om <br /> U coarse fraction < SM Silty sands , sand —silt mixtures <br /> no. 4 sieve size) <br /> SC Clayey sands , sand—clay mixtures <br /> m ML Inorganic silts and very fine sands , rock flour , silty or clayey <br /> fine sands or clayey silts with slight plasticity <br /> �'Sv SILTS a CLAYS <br /> t0 <br /> -.t CL Inorganic cloys of low to medium plasticity , gravelly ways. <br /> e0 LL < 5D sandy Clays , silty clays , lean clays <br /> � .' OL Organic silts and organic silty clays of law piasficity <br /> cc o M H Inorganic silts , micaceous or diatomaceous fine sandy or silty <br /> CD `C4 SILTS a CLAYS soils , elastic silts <br /> 0 0 <br /> z a` e CH Inorganic clays of nigh plasticity , fat clays <br /> v LL �- 50 Organic clays of medium to high y , organic silty <br /> L Q H q plasticity <br /> ctcy , organic silts <br /> HIGHLY ORGANIC SOILS f t Peal and other highly organic soils <br /> P= <br /> LUNIFIED SOIL CLASSIFICATION SYSTEM <br /> COHESIVE SOILS GRANULAR SOILS CLASSIFICATION RANGE OF GRAIN SIZES <br /> Description Blows/f I. Description Blows/ft. U.S. Standard Grain Size <br /> Sieve Size in Millimeters <br /> very soft < 2 very loose < 5 Boulders <br /> above 12" above 305 <br /> soft 2 — 4 loose 5 _ 10 <br /> Cobbles f2" to 3" .305 to 76.2 <br /> medium(firm) 5 - 8 medium dense 11 — 30 <br /> Gravel 3" to no. 4 7fi.� to '4.76 <br /> stiff 9 — 15 dense 31 — S0 coarse (c) 3' to 3/4» 76_2 to 19.1 <br /> ver stiff 16 50 fine (f) 3/4" to na. 4 19.1 to 4.76 <br /> y — 30 very dense > <br /> 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 <br /> medium (m) no_ +O to no. 40 2.00 to 0.420 <br /> fine (f) no. 40 to no. 200 0.420 to 0.074 <br /> L <br /> Bo <br /> Silt a Clay below no. 200 below 0.074 <br /> xGRAIN SIZE CLASSIFICATION <br /> o cm <br /> L 4a ,�6 <br /> .* .. <br /> D. <br /> LZ; <br /> 30 <br /> 20 GL CH <br /> N <br /> i 6 <br /> t MH <br /> O c -ML f4L8 OL: <br /> O to 20 30 40 So 60 70 90 90 too V' <br /> LIQUID LIMtr <br /> [L PLASTICITY CHART <br />