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MAJOR DIVISIONS <br />SYMBOLS TYPICAL SOIL DESCRIPTIONS <br />SIZES <br />GW Well graded grovels or gravel -sand mixtures, little or no fin@$ <br />N <br />AV R <br />Above 12" <br />wee <br />In <br />12" to 3" <br />GP are Poorly graded grovels or grovel -sand mixtures, little or no fines <br />a <br />J 44 <br />(More than 1/2 of <br />76.2 to 4.76 <br />Coarse <br />O A <br />coarse fraction > <br />GM Silty grovels, grovel -sand -silt mixtures <br />size) <br />Kty <br />no. 4 sieve <br />'.. <br />No. 4 to Na 200 <br />4.76 to (1074 <br />W o <br />Z ^ <br />No. 4 to Na 10 <br />GC <br />Clayey gravels, gravel -sand -clay mixtures <br />No. 10 to No. 40 <br />2.00 to 0.420 <br />s*, <br />No. 40 to pNo,200 <br />o <br />SILT a CLAY <br />Below No. 200 <br />Below 0.074 <br />o <br />mom_ <br />Sw sFN' <br />Yg <br />Well graded sands or gravelly sands, little or no fines <br />ON <br />;i <br />SM■ <br />U) <br />A <br />`� <br />■■ <br />C <br />SP <br />Poorly graded vends a gravelly sands, little or no fine <br />Ox <br />U <br />(More than 1/2 of <br />0 <br />0 <br />® <br />coarse fraction < <br />SM <br />Silty sands, sand -silt mixtures <br />g <br />no. 4 sieve site) <br />TR <br />SC <br />Clayey sands, sand -Nay mixtures <br />N <br />M ` <br />Inorganic silts and very fine sands, rock flour, silty or clayey <br />SILTS 81 CLAYS <br />fur sands or clayey sats with slight plasticity <br />CL <br />Inorganic clays of low tq medium plasticity, gravelly cloys, <br />Ja <br />O O L <br />L < 50 <br />sandy clays, silty clays, lean clays <br />to w <br />W°c <br />OL <br />Organic silts and organic silty clays of low plasticity <br />Z_ <br />QMH <br />IIIII <br />Inorganic silts, micaceous or dictomaceous fine sandy or silty soils, <br />00 SILTS a CLAYS <br />lilil <br />elastic silts <br />is Q <br />Z ® <br />U.L.) <br />CH <br />Inorganic clays of high plasticity, fat clays <br />50 <br />OH <br />Organic clays of medium to high plasticity, organic silty cloys, <br />g <br />organic silts <br />HIGHLY ORGANIC SOILS <br />Pt -- <br />Peat and other highly organic soils <br />CLASSIFICATION CHART <br />(Unified Soil Classification System) <br />CLASSIFICATION <br />RANGE OF GRAIN <br />SIZES <br />U. tondardrain <br />Sieve Size <br />Size <br />to Millimeters <br />BOULDERS <br />Above 12" <br />Above 305 <br />COBBLES <br />12" to 3" <br />305 to 76.2 <br />GRAVEL <br />3" to No.4 <br />76.2 to 4.76 <br />Coarse <br />3" to 3W <br />76.2 to 19.1 <br />fins <br />3M` to No. 4 <br />19.1 to 4.76 <br />SAND <br />No. 4 to Na 200 <br />4.76 to (1074 <br />Coarse <br />No. 4 to Na 10 <br />4.76 to 2.00 <br />medium <br />No. 10 to No. 40 <br />2.00 to 0.420 <br />fine <br />No. 40 to pNo,200 <br />0420 to 0074 <br />SILT a CLAY <br />Below No. 200 <br />Below 0.074 <br />0 10 20 30 40 30 so 7a so 90 i00 <br />LIQUID LIMIT <br />PLASTICITY CHART <br />'%'-3'RAIN SIZE CHART <br />METHOD OF SOIL CLASSIFICATION <br />fmcon <br />0 <br />INE <br />MENEM <br />IMENEM <br />MEQ <br />EN <br />No <br />mom_ <br />0 <br />ON <br />■Jqim�E <br />SM■ <br />■■ <br />0 10 20 30 40 30 so 7a so 90 i00 <br />LIQUID LIMIT <br />PLASTICITY CHART <br />'%'-3'RAIN SIZE CHART <br />METHOD OF SOIL CLASSIFICATION <br />fmcon <br />