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UNIFIED SYSTEM <br />CLASSIFICATION OF SOILS FOR ENGINEERING PURPOSES <br />ASTM DESIGNATION D-2487 <br />-- ---- ---Group TyPital <br />- ------ ----- <br />Major Divisions Symbols Names Classification Criteria <br />�vo <br />Cr <br />H J <br />Well -graded gravels and Cu - Oe0 I C10 Greater than 4 <br />N Girlgravel-sandmixtures, �0 12 <br />q ^ little or no fines Ca a ' D detween I and 3 <br />lU 60 <br />Poorly graded gravels and <br />GP ravel -sand mixtures. Not meeting both criteria for GW <br />little or no fines <br />Silty gravels. gravel- <br />sand -silt mixtures <br />Atterberg limits plot <br />below "A" line or <br />Atterberg limits plot - <br />plasticity index <br />ting in hatched area <br />less than 4 <br />are borderline <br />Clayey gravels. gravel- <br />Atterberg Mis—p7o-1— <br />"A" <br />classifications re - <br />sand -clay mixtures <br />above line and <br />quiring use of dual <br />plasticity index <br />symbols <br />greater than 1 <br />Well -graded sands and <br />Cu - L1601,010 <br />Greater than 6 <br />gravelly sands, little <br />1) <br />or no fines <br />ca a C(r X) <br />Between 1 and 3 <br />Poorly graded sands and <br />gravelly sands. little Not meeting both criteria for Ski <br />or no fines <br />Silty sands. sand -silt Atterberg limits plot <br />mixtures below 'A" line or Atterberg limits plot - <br />plasticity index less ting in hatched area <br />than 4 are borderline clas- <br />Ciayey sands, sand -clay Atterberg m s pTo`'--sifications requiring <br />mixtures above "A" line and use of symbols <br />plasticit index <br />greater tan 1 <br />Inorganic Silts. rock <br />flour, silty or clayey <br />NL fine sand <br />n—T orga sic` clays 0 <br />7 16w�t <br />lZ medium plasticity, grav- 60 <br />elly clays, sandy clays. <br />_ silty clays, lean clays SO <br />Organic silts and organic <br />OL silty clays of low 40 <br />plasticity <br />Inorganic silts, micaceous " 30 <br />or diatomaceous silts, <br />elastic silts -_ 20 <br />Inorganic clays of high ell <br />plasticity, fat clays 19 <br />Organic clays of medium <br />of to high plasticity <br />liaetioity olort <br />/Or Olaeeifioaticn of fine. <br />,trained soil& and fine frnotion <br />Of —41-graieed voile. <br />Atterl:erg li.erits plotting, is <br />MtoJ,ed area are borderl- —` <br />oiaseijioatione req„irinp <br />Mee of dual eviitvie, <br />Equation of A-.inO�T'-� <br />Pr . O.711 (LL-sO 6:.J-;� <br />, <br />lit AL <br />00 <br />lu eu JU qu bU bu /u du 9U ]W <br />Uqui.d Zimit <br />Peat, u%KA and otner <br />Mignly organic soils Pt highly organic soils visual -annual identification <br />I <br />BRAun, <br />ENGINEERING TESTING <br />