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i <br /> UNIFIED SOIL CLASSIFICATION SYSTEM <br /> MAJOR DIVISIONS SYMBOLS CODE TYPICAL NAMES <br /> GW 9 9060< <br /> D Well graded gravels or gravel - sand mixtures little or no fines <br /> GRAVELS <br /> 0 r GP 6 O 60 o Poorly graded gravels or gravel - sand mixtures little or no fines <br /> o °m N (More than 1/2 of <br /> 0 - m coarse fraction > GM Silty gravels gravel - sand - silt mixtures <br /> W t° no 4 sieve size) . <br /> Z ' m GC Clayey gravels gravel - sand - clay mixtures <br /> oo SW Well graded sands or gravelly sands little or no fines <br /> w `' SANDS ' <br /> Nm a SP Poorly graded sands or gravelly sands little or no fines <br /> 0a (More than 1/2 of <br /> coarse fraction < SM Silty sands sand - silt mixtures <br /> no 4 sieve size) <br /> SC Clayey sands sand - clay mixtures <br /> ML inorganic silts and very fine sands root flour silty or clayey <br /> SILTS & CLAYS fine sands or clayey silts with slight plasticity <br /> V) m ° CL Inorganic clays of low to medium plasticity gravelly c#ays <br /> o N sandy clays silty clays lean clays <br /> Nom LL < 50 <br /> o ni ' OL Organic silts and organic silty clays of }ow p#asticity <br /> Z - <br /> w �- 0 m <br /> - s p I I r l 1 a Inorganic silts micaceous or diatomaceous fine sandy <br /> o MH <br /> SILTS & CLAYS i r i or silty soils elastic silts <br /> U.J� <br /> v <br /> Z `o C. CH Inorganic clays of high plasticity fat clays <br /> V' LL > 50 <br /> OH 9 P iciOrganic clays of medium to high #astt anis <br /> •••••••, Y organic <br /> clays or anis silts <br /> -silty Y g <br /> HIGHLY ORGANIC SOILS Pt _ - Peat and other highly organic soils <br /> , <br /> CONSISTENCY CLASSIFICATION GRAIN SIZE CLASSIFICATION <br /> COHESIVE SOILS GRANULAR SOILS CLASSIFICATION RANGE OF GRAIN SIZES <br /> Description Blows/ft` Description Blows/ft* US Standard Grain Size <br /> Sieve size i in Millimeters <br /> Very Soft < 3 Very Loose < 5 <br /> BOULDERS Above 12" Above 305 <br /> Soft 3 - 5 Loose 5 - 15 <br /> Medium (firm) 6 - 10 Medium Dense 16 - 40 COBBLES 12 to 3" 305 to 76 2 <br /> I <br /> Stiff 11 - 20 Dense 41 - 65 GRAVEL 3" to No 4 762 to 476 <br /> ' Very Stiff 21 - 40 Very Dense > 65 coarse (c) 3- to 3/4" 762 to 191 <br /> fine (f) 3/4 to No 4 19 1 to 4 76 <br /> Hard > 40 <br /> *Blows/ft-lower 12 inch interval of drive or as notes! SAND No 4 to No 200 476 to 0074 <br /> ' 140 Ib hammer 30" drop California Sampler coarse (c) No 4 to No 10 476 to 200 <br /> medium (m) No 10 to No 40 200 to 0 420 <br /> OTHER SYMBOLS fine (f) No 40 to No 200 0420 to 0074 <br /> ' SILT do CLAY 9elow No 200 Beiow 0074 <br /> Q = Sod Sample <br /> = Initial Water Level <br /> =f= Final Water Levet <br /> - — - = Estimated or gradational material <br /> change tine <br /> = Observed material change line <br /> SOIL CLASSIFICATION CHARTS WKA NO 2307 02 <br /> 1444 MARIPOSA ROAD DATE 12/93 <br /> WALLACE • KUHL do ASSOCIATES, INC 1 <br /> GEOTECHNICAL ENGINEERING Stockton, Collfornlo PLATE NO 15 <br /> GROLOGIC h ENVIRONMENTAL SERVIC$3 <br />