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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 S'� Well -graded gravels, gravel -sand GW mixtures, little or no fines GRAVELS More than 50% GP Poorty-graded gravels, gravel -sand of coarse 4a mixtures, little or no fines fraction larger Gravels with fines Mae than 12% fines than No. 4 sieve size GM Silty gravels, gravel -sand sift 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 Poorly graded sands, gravelly sands, 50% or more of coarse Not meeting all gradation requirements for GW SM Ilttie 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" slave size line with P.I. greater than 7 SM Silty sands, sand -sift mixtures g ASC Clayey sands, sand -day mixtures FINE-GRAINED SOILS (50% or more of material is smaller than No. 200 sieve size.) 0 0 10 20 30 40 50 60 70 80 90 100 Inorganic silts and very fine sands, rock LIQUID LIMIT (LL) (%) III ML flour, silty of clayey fine sands or clayey SILTS silts with slight plasticity AND CLAYS ``'= Inorganic days of low to medium Liquid limit f; CL plasticlty, gravely days, sandy days, less than silty clays, lean days 50% _ OL Organic silts and organic silty days of low plasticity Inorganic silts, micaceous or MH diatomaceous fine sandy or silty soils, SILTS elastic silts AND CH Inorganic days of high plasticity, fat CLAYS Liquid limit clays 50% - OH Organic days 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 from grain -size curve. Depending on percentage of fines (fraction smaller than No. 200 sieve size)• coarse-grained soils are classified as follows: Less then 5 percent ............................. GW, GP. SW, SP More than 12 percent ............................ GM, GC, SM, SC 5 to 12 percent ............... Borderline cases requiring dual symbols LABORAT_, YCLASSIFICATION CRITERIA PLASTICITY CHART 60 - D60 D30 Cu = greater than 4; Cc = between 1 and 3 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 Attefberg limits above "A" requiring use of dual symbols line with P.I. greater than 7 D60 D30 Ca = greater than 4; Cc = between t and 3 SW D10 D10XD60 Sp Not meeting all gradation requirements for GW SM Afterberg limits below'A' Limits plotting in shaded zone 0 2 line or P.I. less than 4 with P.I. between 4 and 7 are borderline cases requiring use SC Atterberg limits above 'A" line with P.I. greater than 7 of dual symbols. Determine percentages of sand and gravel from grain -size curve. Depending on percentage of fines (fraction smaller than No. 200 sieve size)• coarse-grained soils are classified as follows: Less then 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 - T � 40 0 2 � U 20 g 1a a 0 0 10 20 30 40 50 60 70 80 90 100 LIQUID LIMIT (LL) (%)