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MAJOR DIVISIONS SYMBOLS TYPICAL NAMES <br /> GRAVELS GW Well-graded gravels or grovel -sand mixtures .little or no fines <br /> OH GP Poorly graded gravels or grave!-sand mixtures , httie or no fines <br /> ti h (More than I/2 of <br /> o ? coarse fraction s- GM Silty gravels , gravel -sand -silt mixtures i <br /> w ., no 4 sieve size) <br /> z GC Clayey grovels , gravel-sand --clay mixtures <br /> d p <br /> cD r" SANDS <br /> W <br /> SW Well-graded sands or gravelly sands , little or no fines <br /> - <br /> in ++ c SP Poorly graded sands or gravelly sands , little or no fines <br /> (More than I/2 of <br /> coarse fraction < SM Silty sands , sand -silt mixtures <br /> no 4 sleve size) <br /> � $ C Clayey sands sand-clay mixtures <br /> ML Inorganic silts and very Erne sands , rock flour , silty or Clayey 1 <br /> fine sands or clayey sills with slight ploslicity <br /> SILTS a CLAYS <br /> Inorganic clays of low to medium plasticity , gravelly clays, <br /> CL <br /> sandy clays , silty clays , lean clays <br /> o � v LL { 50 <br /> zC\J „ OL Organic silts and organic silty clays of low plasticrty <br /> m o o M H Inorganic silts , micaceous or diatomaceous fine sandy or silly <br /> cD "4 SILTS a CLAYS soils , elastic silts <br /> wa c <br /> CH Inorganic clays of high plasticity , fat clays <br /> LL > 50 OH <br /> Organic clays of medium to Ia <br /> high Plasticity y , organic silty <br /> clay , organic sills <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/fl U S Standard train Size <br /> Sieve Size tri Millimeters <br /> very soft C 2 very loose 5 Boulders above 12" above 305 <br /> soft 2 - 4 loose 5 - 10 Cobbles 12' to 3" Y 305 to 762 <br /> medium(firm) 5 - 8 medium dense 11 - 30 <br /> Gravel 3" to no 4 76.2 to 4 76 <br /> stiff 9 — 15 dense 31 — 50 coarse (c ) 3" to 3/4" 76.2 to 99.1 <br /> fine (f) 3/4 to no 4 491 to 4 76 <br /> very stiff 16 — 30 very dense > 50 <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 /> medium (m) no 10 to no 40 2 00 to 0 420 <br /> CONSISTENCY CLASSIFICATION fine 01 ng 40 to no 200 0420 to 0 oro <br /> Silt & Claybelow no 200 below O 074 <br /> 60 <br /> x 50 <br /> GRAIN SIZE CLASSIFICATION <br /> p RMH <br /> z <br /> 40 t <br /> u <br /> ZO CL �1L«—/i �IOTQIOlIed f!/LL <br /> 4 CL-t L HL 8L OL <br /> 00 10 20 30 40 60 60 70 80 90 100 <br /> L9aUl0 LIMIT <br /> PLASTICITY CHART" <br />