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EXHIBIT B UNIFIED SOIL CLASSIFICATION SYSTEM UNIFIED SOIL CLASSIFICATION AND SYMBOL CHART COARSE-GRAINED SOILS (more than 50% of material Is larger than No. 200 sieve size.) Clean Gravels Less than 5% fines i' GW Well -graded gravels, gravel -sand mixtures, little or no fines GRAVELS More than 50% �� GP Poorty-graded gravels, gravel -sand of mixtures, little or no fines fraction larger Gravels with fines More than 12% fines than No. 4 sieve size GM Silty gravels, gravel -sand -silt mixtures GC Clayey gravels, gravel -sand -day mixtures Above *A" line with P.I. between 4 and 7 are borderline cases Clean Sands Less than 5% fines SW Well -graded sands, gravelly sands, requiring use of dual symbols line with P.I. greater than 7 � little or no fines - SANDS SP Ply graded sands, gravelly sands, 50% or more of coarse _ _ SM little or no fines fraction smaller Sands with fines More than 12% fines than No. 4 with P.I. between 4 and 7 are borderline cases requiring use SC Atterberg limits above 'A' sieve size line with P.I. greater than 7 SM Spry sands, sand -sift mixtures 1 SC Clayey sands, sand -day mixtures 0 10 FINE-GRAINED SOILS (50% or more of material Is smaller than No. 200 sieve size.) LIQUID LIMIT (LL) (%) Inorganic sills and very fine sands, rock ML flour, silty of clayey fine sands or clayey SILTS silts with slight plasticity AND CLAYS Inorganic days of low to medium Liquid limit CL plasticity, gravelly days, sandy clays, less than 'l silty clays, lean days 50% OL Organic slits and organic silty days of low plasticity Inorganic sifts, micaceous or MH diatomaceous fine sandy or silty soils, SILTS elastic silts AND CH Inorganic days of high plasticity, fat CLAYS Liquid limit days 50% - OH Organic Gays of medium to high or greater plasticity, organic silts HIGHLY ORGANIC PT Peat and other highly organic soils SOILS Determine percentages of sand and gravel hom grain -size curve. Depending on percentage of fines (fraction smaller than No. 200 sieve size), coarse-grained soils are classified as follows: Less than 5 percent ............................. GW. GP, SW. SP More than 12 percent ........................... GM, GC, SM, SC 5 to 12 percent ............... Borderline cases requiring dual symbols LABORAT-, Y CLASSIFICATION CRITERIA PLASTICITY CHART 60 D60 D30 C = greater 4; C between 1 and 3 u g c = GW D10 D10xD60 GP Not meeting all gradation requirements for GW GM Atterberg limits below 'A' line or P.I. less than 4 Above *A" line with P.I. between 4 and 7 are borderline cases GC Atterberg limits above 'W requiring use of dual symbols line with P.I. greater than 7 � D60D30 D30 Cu = than 4; Cc = between I and 3 SW D10 DIOXD60 SP Not meeting all gradation requirements for GW SM Atterberg limits below "A" Limits plotting in shaded zone line or P.I. less than 4 with P.I. between 4 and 7 are borderline cases requiring use SC Atterberg limits above 'A' a line with P.I. greater than 7 of dual symbols. Determine percentages of sand and gravel hom grain -size curve. Depending on percentage of fines (fraction smaller than No. 200 sieve size), coarse-grained soils are classified as follows: Less than 5 percent ............................. GW. GP, SW. SP More than 12 percent ........................... GM, GC, SM, SC 5 to 12 percent ............... Borderline cases requiring dual symbols PLASTICITY CHART 60 50 O z � U 20 10 a I 0 0 10 20 30 40 50 60 70 80 90 100 LIQUID LIMIT (LL) (%)