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UNIFIED SOIL CLASSIFICATION SYSTEM <br />UNIFIED SOIL CLASSIFICATION AND SYMBOL CHART <br />COARSE-GRAIN ED SOILS <br />(more than 50% of material is larger than No. 200 sieve size. <br />Clean Gravels (Less than 5% fines) <br />,..„„, <br />GRAVELS •,,*(.1--, <br />Well-graded gravels, gravel-sand <br />mixtures, little or no fines <br />- <br />More than 50% .. Gp <br />of coarse 111..,,,.-,. <br />fraction larger Gravels <br />Poorly-graded gravels, gravel-sand <br />mixtures, little or no fines <br />with fines (More than 12% fines) <br />than No. 4 7iFFr . sieve size 'ti,-; GM Silty gravels, gravel-sand-silt mixtures <br />%c <br />Aq <br />,„ <br />vk... <br />Clayey gravels, gravel-sand-clay <br />mixtures <br />Clean Sands (Less than 5% fines) <br />• SW <br />SANDS <br />— <br />Well-graded sands, gravelly sands, <br />little or no fines <br />50% or more <br />of coarse <br />SP Poorly graded sands, gravelly sands, <br />little or no fines <br />fraction smaller <br />than No. 4 <br />sieve size <br />Sands <br />SM <br />with fines (More than 12% fines,) <br />Silty sands, sand-silt mixtures <br />SC Clayey sands, sand-clay mixtures <br />(50% or more of <br />FINE-GRAINED <br />material <br />SOILS <br />is smaller than No. 200 sieve size.) <br />SILTS <br />AND <br />ML <br />Inorganic silts and very fine sands, rock <br />flour, silty of clayey fine sands or clayey <br />silts with slight plasticity <br />CLAYS <br />Liquid limit <br />less than <br />50% <br />CL <br />-, <br />OL <br />Inorganic clays of low to medium <br />plasticity, gravelly clays, sandy clays, <br />silty clays, lean clays <br />Organic silts and organic silty clays of <br />low plasticity <br />SILTS <br />AND <br />CLAYS <br />Liquid limit <br />50% <br />mH <br />CH <br />Inorganic silts, micaceous or <br />diatomaceous fine sandy or silty soils, <br />elastic silts <br />Inorganic clays of high plasticity, fat <br />clays <br />or greater <br />OH Organic clays of medium to high <br />plasticity, organic silts <br />HIGHLY <br />ORGANIC <br />SOILS <br />PT Peat and other highly organic soils <br />LABORATORY CLASSIFICATION CRITERIA <br />GW <br />D60 D 30 C Cc between 1 3 - greater than 4' = and u - n D10 x D60 '10 <br />GP Not meeting all gradation requirements for GW <br />GM Atterberg limits below "A" <br />line or P.I. less than 4 Above "A" line with Pi between <br />4 and 7 are borderline cases <br />requiring use of dual symbols GC Atterberg limits above "A" <br />line with P.I. greater than 7 <br />SW <br />060 D30 <br />Cu than 4: C, between 1 and 3 = greater = <br />D 10 D10 x D60 <br />SP Not meeting all gradation requirements for GW <br />SM Atterberg limits below "A" <br />line or P.I. less than 4 <br />Limits plotting in shaded zone <br />with P.I. between 4 and 7 are <br />borderline cases requiring use <br />of dual symbols. SC Atterberg limits above "A" <br />line with P.I. greater than 7 <br />Determine percentages of sand and gravel from grain-size curve. Depending <br />on percentage of fines (fraction smaller than No. 200 sieve size). <br />coarse-grained soils are classified as follows: <br />Less than 5 percent GW, GP, SW, SP <br />More than 12 percent GM, GC, SM, SC <br />5 to 12 percent Borderline cases requiring dual symbols <br />PLASTICITY CHART <br />PL <br />A <br />S <br />T <br />I <br />C <br />I <br />T <br />Y <br /> <br />IN <br />D <br />E <br />X <br /> <br />(P <br />I <br />) <br /> <br />(% <br />) <br /> <br />60 <br />50 <br />40 <br />30 <br />20 <br />10 <br />CH <br />CL <br />A LINE <br />PI = 0.73(LL-20) <br />MH&OH <br />CLOAL <br />0 0 <br />ML&OL <br />10 20 30 40 50 60 70 <br />LIQUID UMIT (LL) (%) <br />80 90 100 <br />524 S Shawnee Dr Santa Ana Ca 92704 Soil Classification A <br />524 S Shawnee Dr & <br />Unit# 22/7/2025