Laserfiche WebLink
i <br />STS Soil Classification System <br />k7 <br />UNIFIED SOIL CLASSIFICATION SYSTEM <br />Ma or Divisions <br />Group <br />Symbols <br />Typical Names <br />Laboratory Classification Criteria <br />H! <br />a <br />a <br />c <br />d <br />U <br />0 <br />0 <br />0 <br />1 <br />l0 <br />0 <br />0 <br />0 <br />0 <br />0 <br />v Z <br />E <br />8 <br />0 <br />0 <br />r <br />0 <br />0 <br />No. 4 sieve size) <br />Clean sands ( <br />GW <br />Well graded gravels, gravel- <br />sand mixtures, little or no fines <br />GP <br />GM <br />Poorly graded gravels, gravel - <br />sand mixtures, little or no fines <br />Silty gravels, gravel- sand -clay <br />mixtures <br />GC <br />SW <br />Clayey gravels, gravel -sand- <br />clay mixtures <br />Well graded sands, gravelly <br />sands, little or no fines <br />SP <br />Poorly graded sands, gravelly <br />sands, traces or no fines <br />SM <br />Silty sands, sand and silt <br />mixtures <br />SC <br />Clayey sands, sand and clay <br />mixtures <br />0 <br />0 <br />c <br />c <br />8 <br />8 <br />N <br />0 <br />C = 1- grealerlhan4;C — (D"') benseen latd3 <br />An L'10.4144 <br />Not meeting all gradation requirements for GW <br />Atterberg limits below <br />"A" line or P.I. less than <br />4 <br />Atterberg limits above <br />"A" line with P.I. <br />greater than 7 <br />Above "A" line with <br />P.I. between 4 and 7 <br />are borderline cases <br />requiring use of dual <br />symbols <br />2 <br />C = &greaterthan6;C — (D.) benseenland3 <br />Dm <br />Not meeting all gradation requirements for SW <br />Atterberg limits below <br />"A" line or P.I. less than <br />4 <br />Atterberg limits above <br />"A" tine with P.I. <br />greater than 7 <br />Limits plotting in <br />hatched zone with <br />P.I. between 4 and 7 <br />are borderline cases <br />requiring use of dual <br />symbols <br />ML <br />Inorganic silts, rock flour, silty or <br />clayey fine sands or clayey silts <br />with slight plasticity <br />CL <br />Inorganic clays of low to medium <br />plasticity, gravelly Gays, sandy <br />clays, silty clays, lean clays <br />OL <br />Organic silts and organic silty <br />clays of low plasticity <br />MH <br />Inorganic slits, micaceous or <br />diatomaceous fine silty soils, <br />elastic silts of high placsticity <br />g <br />C0 <br />ccv E m <br />in 8 <br />CH <br />Inorganic clays of high plasticity, <br />fat clays <br />OH <br />Organic clays, slits or silt and <br />clay mixtures of medium to high <br />plasticity <br />Pt <br />Peat and other highly organic <br />soils <br />60 <br />50 <br />40 <br />k 30 <br />20 <br />10 <br />7 <br />4 <br />0 <br />Liquid Limit Plastic ty Chart <br />CL <br />uti <br />A "Ur <br />OH or MH <br />CL -ML ` \\ <br />rnc and a. <br />0 10 20 30 40 50 60 70 <br />Liquid Limit, % <br />80 90 100 <br />For classification of fine- grained soils and fine fraction of coarse - <br />grained soils. <br />Atterberg Limits plotting in hatched area are borderline <br />classifications requiring use of dual symbols. <br />