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1 <br /> UNIFIED SOIL CLASSIFICATION SYSTEM <br /> MAJOR DIVISIONS SYMBOLS CODE TYPICAL NAMES <br />' GWo o Well graded gravels or gravel - sand mixtures little or no fines <br /> AVS <br /> GR_._ <br /> aN (More than 1/2 of GP 6 0' O Poorly graded gravels or gravel - sand mixtures little or no fines <br /> cn co coarse fraction > GM Silty gravels gravel - sand - silt mixtures <br />' o N no 4 sieve size) <br /> Z \ N GC Clayey gravels, gravel - sand - cloy mixtures <br /> a SW °. '. Well graded sands or gravelly sands little or no fines <br />' w cN SANDSe <br /> a SP Poorly graded sands or gravelly sands little or no fines <br /> a o (More than 1/2 of <br /> 0 " coarse fraction < SM Silty sands sand - silt mixtures <br /> no 4 sieve size) <br /> SC V111111Clayey 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 />' N a� Inorganic cloys of iow to medium plasticity gravelly clays <br /> p N GL sandy clays silty clays lean clays <br /> 0 N LL < 50 <br /> W OL Organic silts and organic silty clays of low plasticity <br /> Z ` N <br />' ¢ o o I I I I I I i i I I i Inorganic silts micaceous or diatomaceous fine sandy <br /> i SILTS & CLAYS MH I I I I I I I I I 1 i or silty sods elostic silts <br /> w o <br /> `o CH Inorganic clays of high plasticity fat clays <br /> L.L. > 50 <br /> Organic clays of medium to high plasticity organic <br /> ...., .� <br /> OH .. . . silt clays organic s+lts <br /> , ...��... Y Y 9 <br /> HIGHLY ORGANIC SOILS Pt - - - -- -I Peat and other highly organic sods <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 /> Very Soft < 3 Very Loose < g Sieve size in Millimeters <br />' 8OULDERS 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 />' 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 4 191 to 476 <br /> Hard > 40 <br /> "Blows/ft-lower 12 inch interval of drive or as noted SAND No 4 to No 200 476 to 0074 <br /> I 140 Ib hammer 30 drop California Sampler coarse (c) No 4 to No 10 476 to 2 C <br /> medium (m) No 10 to No 40 2 00 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 /> I] = Soil Sample <br /> at= Initial Water Level <br /> -Y-f= Final Water Level <br /> - — -= Estimated or gradationci material <br /> change line <br /> = Observed material change line <br /> SOIL CLASSIFICATION CHARTS WKA NO 2088.07 <br /> GRANITE CONSTRUCTION DATE 2/95 <br /> WALLACE gVHL ASSOCIATES INC <br /> GEOTECHNICAL ENGINEERING French Camp, California PLATE NO 7 <br />' GEOLOGIC A ENVIRONMENTAL SERVICES <br />