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L <br /> 0 <br /> MAJOR DIVISIONS SYMBOLS <br /> TYPICAL NAMES i <br /> GRAVEL$ <br /> GW Wel!-groded gravels or grgvel-sand mixfures , littfe or no fines { <br /> p „ <br /> GP Poorly graded gravels or, gravel-sand mixtures , little or no fines <br /> 0 (More than 1/2 of <br /> o `o coarse fraction G M Silty gravels , gravel --sand -silt mixtures j <br /> u,r N d no. 4 sieve size) <br /> z G C Clayey grovels gravel <br /> d Go g a e sand -clay mixtures <br /> iii.••rrr o <br /> `4 $W Well-graded <br /> sands or gravelly sands , tittle or no fines <br /> ; <br /> In <br /> CX " <br /> SP Poorly graded sands or <br /> ao � A (More than 1/2 of gravelly sands little or no fines <br /> Q ,coarse fraction ¢ SM Silty sands , sand -silt mixtures <br /> no. 4 sieve size) <br /> S C Clayey sands , sand-clay mixtures <br /> N M L Inorganic sifts end very tine sands , rock flour , silty or clayey <br /> SILTS 8 CLAYS fine sands or clayey silts with slight elasticity <br /> ~ CL Inorganic Cloys of low to medium plasticity , gravelly Cla s <br /> p O LL C cj� sandy clays , silty Clays , lean cls s <br /> 0 L Organic silts and organic silty clays of tow plasticity <br /> a o0 MH Enorganic silts , micaceous or diatomaceous fine scndy Or silt <br /> N sails , elastic silts y <br /> St 8� CLAYS _ F I <br /> z o` C CH Inorganic clays of high plasticity , fat clays <br /> U_ v LL > 50O H Organic clays of c.ay organ c sifts medium to high g• plasticity organic silty j <br /> , I <br /> HIGHLY] ORGANIC SOILSPr Peat and other highly organic sails <br /> UNIFIED SOIL CLASSIFICATIONi <br /> SYSTEM ► <br /> „ SOILS GRANULAR SOILS CLASSIFICATION RANGE OF GRAIN SIZES <br /> �COHESIVE <br /> escri lion i <br /> I, Blows/ft. Description Brows/ft. U. S. Standard Grain Size <br /> Sieve Size in Miflime'ars <br /> very soft C 2 very loose < S <br /> Boulders above f2" _ above 305 <br /> sof! 2 - 4 loose 5 - 30 <br /> Cobbles 12" to 3" 305 to 76.2 <br /> medium (firm) $ - 8 medium dense ] 1 _ 30 <br /> , Gravel 3" to n0. 4 76.2 to -4.70' <br /> stiff <br /> 15 dense 31 - 50 coarse (c) <br /> 3' to 7J4" 76.2 to 19_; <br /> L! very stiff 16 - 30 very dense ] 50 fine {}) 3/4" to no. 4 19.1 to 4.75 t <br /> hard � 30 Sand no. 4 to no. 200 4.76 to 0,074 <br /> coarse (C) no_ 4 to no. fO 4_76 to 2.CC <br /> medium (m) no. r0 to no. 40 2.00 to 0.420 <br /> CONSISTENCY CLASSIFICATION tine (t) <br /> no. 40 to no. 200 0.420 to 0.074 <br /> Sift � Clay below na, 200 below 0.07G � <br /> 60 <br /> x so GRAIN SIZE CLASSIFICATION <br /> W <br /> v CH <br /> L 40 `a6 1 <br /> u 30 4 <br /> r- 20 CL CH . <br /> Q 8 <br /> i a_ 10 M H <br /> ¢ CL-1�{L HL 8 OL <br /> 00 10 20 30 ao 50 60 70 80 90 too <br /> L;OU10 LIMf7U, k <br /> PLASTICITY CHART <br />