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1 ` <br />~ POSTSCRIPTS <br />' THE UPTIFIED SOIL CLASSIFICATION SYSTEM <br /> <br /> <br /> Laborstnrp Clseaifiutioa Criuria <br /> Fixer thaw <br /> Grout/ 200 Steve <br />Major Division Symbol (%) Supplementary Itequ'vemmte <br />Coarse-grsiaed Gravelly CW 0~' Deo/Dtp greater then 9 <br />(over 3046 by eoiL (over Dsq~/(Deo x Drq) br:tweea ] k 3 <br />. weight coerea half of GP 0,5' Not meeting above gradation <br />then No. 200 coarse for GW <br />. sieve) fraction GM 12 or mare' PI lam then 4 or below A-line <br /> larger CC 12 or more' PI over 7 and above A-line <br />. then No. 4) <br />. Sandy soils SW D-5' Dao/Dro greater then 4, <br /> (ova half Dsot/(Deo x Dro) between 1 & 3 <br />. of coarse SP 0-5' Not meeting above gradation <br /> frattioa requirements <br />. Sna then SM 12 or more' PI lees than 4 or below A-line <br /> No. 4) SC 12 or more' PI ova 7 and above A-line <br />. <br /> <br /> <br />Soil Description <br />22-3 <br />Well-graded grades, wady gravels <br />Gap-graded or uniform gravels, <br />eaady gravels <br />Silty gravels, silty eandv gravels <br />Clayey gravels, clayey emdy <br />gravels <br />Well-graded, gravelly eaade <br />Gap-graded or uaiforin sands, <br />gravelly sends <br />Silty sends, silty gravelly sends <br />Clayey sends, clayey gravelly <br />Fine-grained Low com- ML Plasticity Chart Silts, very fine sends, silty or <br />(ova 50% by Dre~ibility clayey Sae sends, micaceous silts <br />weight fins (liquid CL Plasticity Chart Low plasticity clays, Bandy or e0ty <br />than No. 200 limit lees days <br />sieve) then 50) OL Plasticity chart, argeaic odor or color Organic ails and clays of low <br /> plasticity <br /> High mm- MH Plasticity Chart Micaceous silts, diatomaceous e0ta, <br /> premibility volraaic ash <br /> (liquid CH Plasticity chart Highly plastic clays and sandy <br /> limit more clays <br />- then SO) OH Plasticity Chart, organic odor or color Orgmic silts and clays of high <br /> plasticity <br />Soils with fibrous Pt Fibrous orgmit matter; will roar, Peat, Beady peals, and clayey peat <br />orgmit metro burn, or glow <br />• 'Fm voile having 3 to 12% peeaiag the No. 200 sieve, use a dual symbol sorb as GW~C. <br />• 80 <br />• <br /> 70 <br />• <br />• 60 <br /> 50 <br />• plasticity <br /> index 40 <br />• <br />• 30 <br />• <br /> 20 <br /> <br />• 10 <br />. 0 <br />. ~ 0 70 20 30 40 50 fi0 70 80 90 100 110 120 <br />liquid limit <br />. Plasticity chart for the clessifiut~on o1 fineyrained soils. Tests made on fraction <br />finer then No. 40 sieve, 0.425 mm. <br />PROFESSIONAL PUBLICATIONS INC. • P.O. Box 199, Sen Carlos, CA 94070 <br />