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UNIFIED SOIL CLASSIFICATION SYSTEM <br /> MAJOR DIVISIONS SYMBOLS CODE TYPICAL NAMES <br /> GW ° 6 o Well graded gravels or gravel - sand mixtures lithe or no fines <br /> GRAVELS — <br /> N � GP d o O� Poorly graded gravels or gravel - sand mixtures tittle or no fines I <br /> J <br /> 0 -6 (More than 1/2 of <br /> C) to ry <br /> V) N coarse fraction > GM Silty grovels gravel - sand - silt mixtures <br /> 0 <br /> o C > no 4 neve size) <br /> a ", N GC Clayey gravels grovel - sand - clay mixtures <br /> 0 t o SW Well graded sands or gravelly sands little or no fines <br /> iA " N SANDS ' <br /> I ¢ oSP Poorly graded sands or gravelly sands little or no fines <br /> O M n (More than 1/2 of <br /> coarse fraction < SM Silty sands sand - silt mixtures <br /> no 4 sieve size) <br /> I 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 /> s V) 0 N CL Inorganic clays of low to medium plasticity gravelly clays <br /> 11 <br /> o - m sandy clays silty clays lean clays <br /> 0 ° iu LL < 50 <br /> M OL Organic silts and organic silty clays of low plasticity <br /> Z � N <br /> I < a oo MH <br /> U 111111111111 Inorganic silts micaceous or diatomaceous fine sandy— <br /> = N SILTS & CLAYS or silty soils elastic setts <br /> W o <br /> iZ- o <br /> v CH lnorganlc clays of high plasticity fat clays <br /> � <br /> LL > 50 <br /> Organic clays of medium to high plasticity organicOH � <br /> silty days organic silts <br /> HIGHLY ORGANIC SOILS Pt -—_- - Peat and other highly organic sol#s <br /> CONSISTENCY CLASSIFICATION GRAIN SIZE CLASSIFICATION <br /> COHESIVE SOLS GRANULAR SOILS CLASSIFICATION RANGE OF GRAIN SIZES <br /> Description Blows/f tDescription Btows/ft* US Standard Grain Size <br /> Very Soft < 3 Very Loose < 5 - Sieve size in Millimeters <br /> I <br /> Soft 3 5 Loose 5 15 <br /> BOULDERS Above 12" Above 305 <br /> - - <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" 76 2 to 191 <br /> fine (f) 3/4" to No 4 191 to 4 76 <br /> Hord > 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 10 476 to 200 <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 /> 17-SIL <br /> T & CLAY Beiow No 200 Below 0074 <br /> = Sod Samplei <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 2086 05 <br /> 2000 STIMSON ROAD DATE 3/93 <br /> WALLACE + KUHL & ASSOCIATES, INC C <br /> GEOTECHNICAL ENGINEERING Stockton, California PLATE NO 13 <br /> IGEOLOGIC A ENVIRONMENTAL SERVICES <br />