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UNIFIED SOIL CLASS1r ICATION <br />Major Diyisiota <br />Group. <br />symbols <br />Typical names <br />Laboratory classification criteria <br />GC <br />SW <br />SP <br />M <br />Well -grades gravels. gravel -sand <br />mixures. little or no Tina <br />Clayey gravels. gravel-sand-clay <br />mixtures <br />Weil - graded sands. gra.ells <br />sands. little or no fines <br />Poorly graded sands gnvdly <br />sands. little or no fines <br />d <br />Silty sands. sand -silt <br />mistura <br />Clayey sands, and -day mix- <br />tures <br />Cu =D= grvtc tan 6 Cc (19'r1 bawecn 1 and 7 <br />D.. D.aD. <br />Not meeting all gradation requirements for GIN <br />Anerberg limits below "A'• <br />line or P,I. Less than 4 <br />Atterberg limits above "A" <br />line with P.1. greater than 7 <br />Above "A" line with P.1. <br />between 4 and 7 are bor- <br />derline . scs requiring use <br />of dual symbols <br />Cu = D rites :tun 4: Ce a fD•r be ,seen 1 and 3 <br />D. D.D <br />Not meeting all gradation couircments for SW <br />Atterberg limits beiow ••A•• <br />line or P.I. less than -s <br />Atterberg limits above "A" <br />line with P.I. greater than 7 <br />Limits plotting in hatched <br />zone with P.1. between 4 <br />and 7 are borderline cases <br />requiring use of dual sym- <br />bols <br />L S <br />o <br />ML <br />Inorganic silts and very fine <br />sands. rock flour. silty or clayey <br />fine sands or clayey sifts•with <br />slight plasticity <br />CL <br />Inorganic days of low to Inc. <br />dium plasticity, gravelly days. <br />sandy days. tidy' days, Lean <br />days <br />OL <br />MH <br />Organic sibs and organic silty <br />days of low plasticity <br />Inorganic silts. micaceous or <br />diatomaceous tine sandy or <br />silty soils. elastic silts <br />CH <br />014 <br />Pt <br />Inorganic days of high plas- <br />ticity. far days <br />Organic days of medium to <br />hsgb pLasticity, organic silts <br />Peal and other highly organic <br />sods <br />50 <br />40 <br />10 <br />7 <br />4 <br />- 3 1 - <br />0 <br />( I I <br />— For classification of finesrnned <br />-- Wth and fraction <br />.me of coarse- <br />'— grained sods. <br />— <br />— Atterberg Limits 'n <br />plotting <br />— hatched area are borderline day <br />— ifcanons regmnng dual <br />H <br />use of <br />— Ec.latlon of A -Ime. <br />^--- <br />PI 0."3 LLL • S1 <br />� <br />I <br />♦ <br />� <br />014 van MH <br />CL <br />I <br />1 <br />o <br />( <br />1 <br />\aJ \, <br />I <br />-_ 9 I 14_�vt <br />st <br />saw <br />' <br />I.' <br />I <br />1 <br />0 10 rA 30 40 50 60 70 10 90 100 <br />Liquid Limn <br />Plasti.ory Chan <br />