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EXHIBIT B <br /> UNIFIED SOIL <br /> CLASSIFICATION SYSTEM <br /> UNIFlED SOIL CLASSIFICATION AND SYMBOL CHART LABORATORY CLASSIFICATION CRITERIA <br /> COARSE-GRAINED SOILS <br /> (more than 50% of material is larger than No. 200 sieve size.) <br /> Gean Gravels Less Than 5% fines D D <br /> WeA-graded gravels, gravel-sand Cu = 60 greater than 4: C - 30 between 1 and 3 <br /> GRAVELS GW mixtures, Ittfte or no fines GW D10 c D10 x60 <br /> More than 50% ~a Poorly~raded grevels, gravel-sand <br /> of coarse .m GP mbdures, little or no Imes GP Not meeting all gredatbn ?equiremeMs for GW <br /> fraction larger Gravels with fines More than 12% fines <br /> than No. 4 <br /> sieve size GM Silty gravels, gravel-sand-sift mlxWres GM limits below'A' Above 'A' line wtth P.I. between <br /> line or P.I. less than 4 <br /> 4 and 7 ere borderilne cases <br /> GC Clayey gravels, grevel-sand-Gay GC Atterberg limits above'A' requiring use of dual symbols <br /> mixtures line with P.I. greater than 7 <br /> Clean Sams Less than 5% fines <br /> Well-graded sands, gravelly sands, Cu = D60 greater then 4: Cc = D30 between 1 and 3 <br /> SW little or no fines SW D 10 D1 o x D60 <br /> SANDS <br /> 50% or more gp PAY 9reded sands, gravelly sands, <br /> of coarse little or no fines gp Not meeting all gradation requirements for GW <br /> <br /> (radion smaller Sarxts with fines More than 12% fines <br /> than No. 4 <br /> sieve size SM Silty sands, sand-sift mixtures ~ Atterberg Iimi~ bebw'A" omits plotting in shaded zone <br /> line or P.I. less than 4 with p,l. between 4 and 7 are <br /> i'~f Atterberg limtts above'A" border8ne cases requiring use <br /> SC Gayey sands, sand-day mixtures ~ line with P.I. greater than 7 ~ dual symbols. <br /> FINE-GRAINED SOILS <br /> (50% or more of material is smaller than No. 200 sieve size.) Determine percentages of sand and gravel from amain-size auve. Depending <br /> on percentage o(fines (fredion smaller than No. 200 sieve size), <br /> Inorganic silts and very fine sands, rode coarse~greined sills are dassified as fdlow:: <br /> SILTS ML flour, silty d dayey flue sands or dayey Lass than 5 percent GW, GP, sw. SP <br /> silts with slight plastldly More than 12 percent GM. GC. SM. SC <br /> CLAYS Inorgank days of low to medium 5 to 12 percent Borderine cases requiring dual symbol <br /> Liquid limit CL PlasfidtY. gravelly days. sandy days, <br /> less than sNty days, lean days PLASTICITY CHART <br /> 50% <br /> - OL Organic silts and organic silty days of ~ <br /> - bw plastidly a' <br /> Irxxgank silts, micaceous or 50 <br /> MH diatomaceous floe sandy or silty sills, d ~ <br /> SANG elastic silts o ~ ALINE; <br /> CLAYS Inorganic days of high plastidty, fat = ~ PI = 073 LL-20 <br /> Liquid limit ~ days ~ CL MHd~OH <br /> 50% U 20 <br /> or greater <br /> OH Organic days of medium to high ~ 10 <br /> plasUdty, organic silts S M1.80L <br /> HIGHLY - 00 10 20 30 40 50 60 TO 80 90 100 <br /> ORGANIC PT Peat and other highly organic soils LIQUID LIMIT (LL) <br /> SOILS <br /> <br />