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F <br /> ATC Env i ronmen-ta I, Inc <br /> Unified SoII Classif. iCation System <br /> Legend <br /> MAJOR DIVISIONS SYMBOL PATTERN TYPICAL DESCRIPTION <br /> Nell gragrovels and grovel-sand mixtures with <br /> GW • °c/J°aIJNJ little or no fided nes. <br /> Clean gravele "�aq <br /> wixh I�ttle or GP: Poorly graded ovels and gravel-sand mixtures <br /> GRAVELS <br /> no fine. GP aeaoaee r s <br /> o eo or' with little or no Ines. <br /> am ao ao a o GMS Silty grovels and poorly graded gravel-sand-silt <br /> 50% or more of the"..arae G M mixtures. <br /> CD Fraction ie retained on o - <br /> No. 9 sieve Gravels with <br /> I i e ,over 12% Flees GC- Clayey gravels and poorly graded gravel-sand-clay <br /> LCI <br /> `o GC mixtures. <br /> - <br /> SW Well graded sandsandgravelly sands with little <br /> fU S'�,f or no fines. <br /> _ <br /> Clean sand <br /> e <br /> ro ro SANDS with little or SP' Poor) raded sands and ravel) sands with <br /> no Fines Y o 9 Y <br /> Q i SP litt le or no Fines. <br /> U~ <br /> More than 50% of the coorea r SMS Silty sands and poorly graded sand-sill mixtures <br /> . <br /> Fraction passes through a SM <br /> No. 9 sieve Sande with <br /> over 12% Fine. r- SC- Clayey Sands and:poorly graded sand-clay mixtures, <br /> SC tlLInorganic s its and very fine sands, rock Flour, <br /> ML silty or clayey Fine sands, or clayey silts with <br /> ' SILTS & CLAYS eli hi plasticity. <br /> l O / CL: Inorganic cloys of low to medium plasticity, <br /> C L -grovelly cloys, sandy clays, -silty cloys, or lean <br /> rD$ Liquid limit 50% or less .Ola s. <br /> OL. Organic silts and organic silty clays of low <br /> 0 a 0 L plasticity. <br /> z e <br /> Q` MH' Inorganic silts, micaceous or diatomaceous Fine <br /> K MH sandy or silty soils, elastic silts. <br /> SILTS & CLAYS <br /> W _ CHS Inorganic cloys of high plasticity and Fat clays. <br /> ti CH <br /> 1 L.� b Liquid limit greater than 50% <br /> 1 "' OHS Organic cloys of medium to high plasticity and <br /> OH organic silts- <br /> . Pt: Peat, mulch and other highly organic soils. <br /> HIGHLY ORGANIC SOILS Pt <br /> MOISTURE CONTENT SPT BLOW COUNTS <br /> SANDS - CLAYS <br /> DRY Little or no perceptible moisture 0-9 Very Loose O-2 Very Soft <br /> -� DAMP Some perceptible moisture, not compactible S-10 . Loo ee 3-9 Soft <br /> MOIST Compactible, come liquid can be diffused"From the soil 11-30 Medium Dense 5-8 Medium Stiff <br /> WET Above compactible range, sail will smudge or smear 31-50 Dense 9-15 Stiff <br /> SATURATEDz Pores, voide'Filled with water >50 Very 0enee 16-30 Very StiFF <br /> I .� >30 Hard <br />