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UNIFIED SOIL CLASSIFICATION SYSTEM <br /> MAJOR DIVISIONS SYM80LS CODE TYPICAL NAMES <br /> GW o d o Well graded gravels or gravel - sand mixtures, little or no fines <br /> GRAVELS <br /> o N N {More than 1/2 of GP '30 <br /> 0 6 o in <br /> Poorly graded gravels or gravel - sand mixtures little or no fines <br /> C, <br /> 0 m coarse fraction > GM Silty gravels grovel - sand - silt mixtures <br /> W C14no 4 Breve size) - <br /> 1-1 q GC Clayey grovels, gravel - sand - clay mixtures <br /> < <br /> w o SAND5 <br /> SW - ° `- �� Well graded sands or gravelly sands little or no fines <br /> o co SP > Poorly graded sands or gravelly sands little or no fines <br />' n (More than 1/2 of <br /> v coarse fraction < SM Silty sands sand - silt mixtures <br /> no 4 Breve size) <br /> Sc Clayey sands sand - clay mixtures <br /> ML Inorganic silts and very fine sands rock flour silty or clayey <br /> SILTS & CLAYS fine sands or clayey silts with slight plasticity <br /> µ y ^� CL Inorganic clays of low to medium plasticity, gravelly clays, <br />' ° rA LL < 50 sandy clays silty clays, lean clays <br /> w 2 OL Organic silts and organic silty clays of low plasticity <br /> st a MH 11 1 1 i 1 1 1 r i 1 r Inorganic silts micaceous or diatomaceous fine sandy <br />' 0 `" SILTS & CLAYS 141111111111 or silty soils elastic silts <br /> Z c CH Inorganic clays of high plasticity fat clays <br /> LL > 50 <br /> Organic clays of medium to high plasticity organic <br /> .\ \\ <br /> OH \\\�\\\\N silt <br /> y clays organic silts <br /> HIGHLY ORGANIC SOILS Pt --_ — Peat and other highly organic soils: <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 in Millimeters <br /> Very Soft < 3 Very Loose < 5 <br />' <br /> Soft 3 Loose 5 15 <br /> BOULDERS Above 12' Above 305- 5 - <br /> Medium (firm) 6 - 10 Medium Dense 16 - 40 COBBLES 12' to 3" 305 to 76 2 <br /> Stiff 11 - 20 Dense 41 - 65 GRAVEL 3' to No 4 75 2 to 4 76 <br /> Very Stiff 21 - 40 Very Dense > 65 coarse (c) 3" to 3/4' 76 2 to 19 1 <br /> fine (f) 3/4' to No 4 191 to 476 <br /> Hard > 40 <br /> `Blows/ft-lower 12 inch interval of drive or as noted SAND No 4 to No 200 4 76 to 0074 <br />' 140 Ib hammer 30" drop California Sampler coarse (c) No 4 to No 10 4 76 to 2 00 <br /> medium (m) No 10 to No 40 ZOO to 0 420 <br /> OTHER SYMBOLS fine (f) No 40 to No 200 0420 to 0074 <br /> SILT & CLAY Below No 200 Below 0074 <br />' ❑ = Soil Sample <br /> Initial Water Level <br /> Final Water Level <br /> Estimated or gradational material <br /> change line <br /> Observed material change line <br /> SOIL CLASSIFICATION CHARTS WKA NO 1628 02 <br /> 404 WEST FREMONT STREET DATE 9/94 <br /> WALLACE • KUIIL & ASSOCIATES, INC <br /> OROTECHNICAL ENGINEERING Stockton, California PLATE NO 5 <br /> GEOLOGIC & ENVIRONMENTAL SERVICES <br />