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MAJOR DIVISIONS <br />LETTER <br />TYPICAL DESCRIPTION <br />SYMBOL <br />Clean <br />GW <br />Well -graded gravels, gravel -sand mixtures, little or no fines. <br />Gravels (less <br />GRAVELS <br />than <br />U) <br />(D <br />20 <br />Moran 50% <br />fines) <br />s) <br />GP <br />Poorly -graded gravels, gravel -sand mixtures, little or no fines. <br />m N <br />of coarse fraction <br />To N <br />is larger than No. <br />GM <br />Silty gravels, gravel -sand -silt mixtures, non -plastic fines. <br />r- > <br />4 sieve <br />Gravels with <br />GC <br />Clayey gravels, gravel -sand -clay mixtures, plastic fines. <br />z Co E o <br />fines <br />o N <br />O <br />LO o <br />Clean Sands <br />SW <br />Well -graded sands, sands with gravel, little or no fines. <br />aj <br />Z <br />SANDS <br />(less than <br />a(a <br />More than 50% <br />5% fines) <br />SP <br />Poorly -graded sands, sands with gravel, little or no fines. <br />�' �' <br />of coarse fraction <br />v <br />is smaller than <br />SM <br />Silty sands, sand -silt mixtures, non -plastic fines. <br />No. 4 sieve <br />Sands with <br />SC <br />Clayey sands, sand -clay mixtures, plastic fines. <br />fines <br />L <br />ML <br />Inorganic silts, rock flour, clayey silts with slight plasticity. <br />cc <br />E .N <br />SILTS AND CLAYS <br />CL <br />Inorganic clays of low to medium plasticity. (Lean clay) <br />p <br />To <br />Liquid Limit is less than 50% <br />G <br />cca 'N <br />OL <br />Organic silts and organic clays of low plasticity. <br />Z <br />Eo <br />0 <br />°\o N <br />MH <br />Inorganic silts, elastic. <br />O <br />Lo o <br />Z <br />SILTS AND CLAYS <br />W <br />Z <br />�. <br />Liquid Limit is greater than 50/o o <br />CH <br />Inorganic clays of high plasticity. (Fat clay) <br />LL <br />� <br />O <br />OH <br />Organic clays of high plasticity. <br />HIGHLY ORGANIC SOILS <br />PT <br />Peat. <br />DEFINITION OF TERMS AND SYMBOLS <br />N <br />Standard Penetration <br />2" OUTSIDE DIAMETER SPILT SPOON SAMPLER <br />W <br />Density Resistance in Blows/Foot <br />J <br />Z <br />2.4" INSIDE DIAMETER RING SAMPLER OR <br />O <br />Very Loose 0-4 <br />SHELBY TUBE SAMPLER <br />N <br />Loose 4-10 <br />= <br />Medium Dense 10-30 <br />= WATER LEVEL (Date) <br />O <br />Dense 30-50 <br />V <br />Very Dense >50 <br />Tr TORVANE READINGS, tsf <br />Pp PENETROMETER READING, tsf <br />Standard Penetration <br />Consistancy Resistance in Blows/Foot <br />W <br />� <br />DD DRY DENSITY, pounds per cubic foot <br />Very Soft <br />W <br />Soft 2--24 <br />LL LIQUID LIMIT, percent <br />O <br />Medium Stiff 4-8 <br />V <br />Stiff 8-16 <br />PI PLASTIC INDEX <br />Very Stiff 16-32 <br />Hard >32 <br />N STANDARD PENETRATION, blows per foot <br />Terra <br />UNIFIED SOIL CLASSIFICATION SYSTEM <br />,.,•,.:;.`;::: <br />RIVERSIDE BUSINESS PARK LOTS 2 AND 4 <br />••• Associates, Inc. <br />EVERETT, WASHINGTON <br />Consultants in Geotechnical Engineering <br />Geology and <br />Environmental Earth Sciences <br />Pro No.T-7388-1 <br />1• <br />Date DEC 2016 <br />Figure A-1 <br />