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UNIFIED SOIL CLASSIFICATION SYSTEM <br /> MAJOR DIVISIONS SYMBOLS CODE TYPICAL NAMES <br /> GW 6� Well graded gravels or gravel — sand mixtures little or no fines <br /> GRAVELS <br /> V) = GP p p Poorly graded grovels or gravel — sand mixtures little or no fines <br /> _w o m (More than 1/2 of O d <br /> p n N <br /> N m coarse fraction > GM Silty gravels grovel — sand — silt mixtures <br /> I o �°no 4 sieve size) <br /> N <br /> GC Clayey grovels grovel — sand — clay mixtures <br /> C) SW ': Well graded sands or gravelly sands little or no fines <br /> I w " SANDS ' <br /> v <br /> u: � c SP Poorly graded sands or gravelly sands little or no fines <br /> 0 <br /> (More than 1/2 of <br /> ov —:Z A 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 rock flour silty or clayey <br /> SILTS & CLAYS fine sands or clayey silts with slight plasticity <br /> CO <br /> m N CL Inorganic clays of low to medium plasticity gravelly clays <br /> I o — V) sandy clays, silty clays lean clays <br /> rn a N LL < 50 <br /> a OL Organic silts and organic silty clays of low plasticity <br /> 2 <br /> � r QMH 'i r l i l i i i i i i Inorganic silts micaceous or diotomaceous fine sandy <br /> 0 " `4 SILTS & CLAYS °I I I I I i i I i or silty soils elastic silts <br /> w m o <br /> o` <br /> v CH Inorganic clays of high plasticity fat c#ays <br /> LL > 50 ........ <br /> OH O€gy cilays yorganic sas of lts ium to high plasticity organic <br /> HIGHLY ORGANIC SOILS Pt —_ — Peat and other highly organic soils <br /> CONSISTENCY CLASSIFICATION GRAIN SIZE CLASSIFICATION <br /> ICOHESIVE SOILS GRANULAR SOILS CLASSIFICATION RANGE OF GRAIN SIZES <br /> Description Slows/ft" Description Biows/ft" US Standard Grain Size <br /> Very Soft G 3 Very Loose < 5 Sieve size m Millimeters <br /> ISoft 3 — 5 Loose 5 — 15 BOULDERS Above 12" Above 305 <br /> Medium (firm) 6 — 10 Medium Dense 16 — 40 COBBLES 12" to 3" 305 to 762 <br /> Stiff 11 — 20 Dense 41 — 65 GRAVEL 3 to No4 76 2 to 4 76 <br /> Very Stiff 21 — 40 Very Dense > 65 coarse (c) 3 to 3/4" 76 2 to 191 <br /> fine (f) 3/4 to No 4 19 1 to 4 76 <br /> Hord > 40 <br /> ' /ft—lower SAND No 4 to No 200 4 76 to 0 C74 <br /> 140 to s hammer 12 drop California Sampler coarse (c) No 4 to No 10 4 76 to 2 <br /> Blows 12 inch interval of drive or as noted <br /> medium (m) No 70 to No 40 2 00 to O 42 420 <br /> OTHER SYMBOLS fine (f) No 40 to No 200 0420 to 0074 <br /> SILT & CLAY Below No 200 Below 0474 <br /> (] = Sod Sample <br /> 7t= Initial Water Level <br /> =f= Final Water Level <br /> — — Estimated or gradational material <br /> change line <br /> = Observed material change line <br /> SOIL CLASSIFICATION CHARTS WKA NO 2088 03 <br /> GRANITE CONSTRUCTION DATE 4/93 <br /> WALLACE - KUHL ASSOCIATES INC <br /> I GEOTECHNICAL ENOINEERINO French Camp, California PLATE NO 24 <br /> GEOLOGIC R ENVIRONMENTAL SERVICES <br />