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SunwoodDriveΑStreetImprovements <br />Ramsey,Minnesota <br />NTIProjectNo.16.61770.100 <br />CLASSIFICATIONofSOILSforENGINEERINGPURPOSES <br />ASTMDesignationD2487andD2488(UnifiedSoilClassificationSystem) <br />Group <br />MajorDivisionsTypicalNameClassificationCriteria <br />Symbol <br />use <br />Gravels <br />WellΑgradedgravelsand <br />fraction <br />Cu=D60/D10greaterthan4. <br />GW <br />gravelsandmixtures,little <br />requiring <br />sieve. <br />Cz=(D30)2/(D10xD60)between1&3. <br />ornofines. <br />Clean <br />Poorlygradedgravelsand <br />coarse <br />4 <br />GP <br />gravelsandmixtures,littleNotmeetingbothcriteriaforGWmaterials. <br />No.Classification <br />Gravels <br />* <br />ornofines. <br />sieve <br />of <br />Fines <br />on <br />Atterberglimits <br />more <br />Siltygravels,gravelsandSP <br />Atterberglimits <br />SC <br />retained <br />GM <br />belowͻ!ͼline,or <br />200 <br />SW, <br />SM, <br />with siltmixtures. <br />plottinginhatched <br />fines. <br />P.I.lessthan4. <br />Borderline <br />or <br />No.areaareborderline <br />Soils <br />GP,GC, <br />Atterberglimits <br />Gravels <br />classifications <br />50% <br />Clayeygravels,gravelsand <br />GW,aboveͻ!ͼline <br />GM, <br />of <br />on <br />GC <br />requiringuseofdual <br />Grained <br />claymixtures.withP.I.greater <br />percentage <br />retained <br />symbols. <br />Sieve: <br />than7. <br />Sieve: <br />Sieve: <br />Wellgradedsandsand <br />fraction <br />Course <br />Cu=D60/D10greaterthan6. <br />Sands <br />200 <br />SW <br />gravellysands,littleorno <br />200 <br />Cz=(D30)2/(D10xD60)between1&3. <br />50% <br />200 <br />fines. <br />No. <br />of <br />No. <br />sieve. <br />Clean <br />coarse <br />than No. <br />basis <br />passing <br />Poorlygradedsandsand <br />passing <br />SP <br />gravellysands,littleornopassingNotmeetingbothcriteriaforSWmaterials. <br />Sands <br />More <br />4 <br />on <br />of <br />fines. <br />No <br />symbols. <br />12% <br />Classification 12% <br />50% <br />passes <br />Atterberglimits <br />Atterberglimits <br />5% <br />Siltysands,sandsilt <br />to <br />with <br />SM <br />belowͻ!ͼline,or <br />than <br />plottinginhatched <br />than <br />mixtures.than <br />Fines <br />5% <br />P.I.lessthan4. <br />duel <br />areaareborderline <br />Sands <br />More <br />Atterberglimits <br />LessFrom <br />More <br />classifications <br />of <br />Clayeysands,sandclay <br />aboveͻ!ͼline <br />SC <br />requiringuseofdual <br />mixtures. <br />withP.I.>7. <br />symbols. <br />Inorganicsilts,veryfine <br />less <br />ML <br />sands,rockflour,siltyor <br />clayeyfinesands. <br />or <br />Clays <br />50% <br />Inorganicclaysoflowto <br />of <br />and <br />* <br />mediumplasticity,gravelly <br />CL <br />sieve <br />Limit <br />clays,sandyclays,silty <br />Silts <br />clays,leanclays. <br />200 <br />Liquid <br />Soils <br />No. <br />Organicsiltsandorganic <br />OL <br />Grained <br />siltyclaysoflowplasticity. <br />passes <br />than <br />Inorganicsilts,micaceous <br />50% <br />greater <br />Fine MH <br />ordiatomaceousfinesands <br />Clays <br />orsilts,elasticsilts. <br />than <br />50%. <br />and <br />Limit <br />Inorganicclaysofhigh <br />CH <br />More <br />Silts <br />plasticity,fatclays. <br />Liquid <br />Organicclaysofmediumto <br />OH <br />highplasticity. <br />Organic <br />Highly <br />Soils <br />Peat,muckandother <br />Pt <br />Plasticity Limit <br />highlyorganicsoils. <br /> <br />