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UNIFIED SOIL CLASSIFICATION SYSTEM <br /> MAJOR DIVISIONS SYMBOLS CODE TYPICAL NAMES <br /> GW o b 0 Well graded gravels or gravel — sand mixtures, little or no fines <br /> GRAVELS <br /> 0 - GP Q c Q n Poorly graded gravels or gravel - sand mixtures, little or no fines <br /> o 0 ro (More than 1/2 of 6 O <br /> (A - m coarse fraction > GM Silty grovels, gravel - sand - silt mixtures <br /> n o N > no 4 sieve size) <br /> LLJ -_ N GC Clayey gravels, gravel - sand - clay mixtures <br /> to Syy - �_� + Well graded sands or gravelly sands, little or no fines <br /> SANDS ' <br /> `oSP Poorly graded sands or gravelly sands little or no fines <br /> d � n (More than 1/2 of <br /> c0 `� coarse fraction < <br /> 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 slits with slight plasticity <br /> ' 0 N CL Inorganic clays of low to medium plasticity, gravelly clays, <br /> m sandy clays silty clays, lean clays <br /> V) O LL < 50 <br /> ` T OL Organic silts and organic silty clays of low plasticity <br /> < o o l i i i i i Inorganic silts micaceous or diatomaceous fine sandy <br /> O N FCH <br /> H I I 1 I I I i I I I I i or silty soils, elastic silts <br /> SILTS & CLAYS <br /> v <br /> 0 <br /> C Inorganic clays of high plasticity, fat clays <br /> " V LL > 50 <br /> """"...�.... Organic clays of medium to high plasticity organic <br /> OH ....�..� silt clays organic silts <br /> ....�... Y Y <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/ftw US Standard Grain Size <br /> Very Soft < 3 Very Loose < 5 Sieve size in Millimeters <br /> Soft 3 - 5 Loose 5 - 15 BOULDERS Above 12" Above 305 <br /> Medium (term) 6 - 10 Medium Dense 16 - 40 <br /> COBBLES 12" to 3" 305 to 762 <br /> Stiff 11 - 20 Dense 41 - 65 GRAVEL 3" to No 4 762 to 1 476 coarse (c) 3" to 3/4" 76 2 to 19 1 <br /> Very Stift 21 - 40 Very Dense > 65 fine (f) 3/4" to No 4 191 to 476 <br /> Hard > 40 <br /> i <br /> Blows/ft-lower 12 inch interval of drive or as noted 5gNA No 4 to No 200 4 76 to 0074 <br /> 140 ib hammer 30' drop California Sampler coarse W No 4 to No 10 4 76 to 2 00 <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 007a <br /> SILT do CLAY Below No 200 Below 0074 <br /> � = Soil Sample <br /> = Initial Water Level <br />' 3ff= Final Water Level <br /> = Estimated or gradational material <br /> change line <br /> I <br /> Observed materiel change line <br /> ® SOIL CLASSIFICATION CHARTS WKA NO 2088 03 <br />! GRANITE CONSTRUCTION DATE 4/93 <br /> WALLACE " XUHL & ASSOCIATES, INC <br />' GEOTECHNICAL ENGINEERING French Camp, California PLATE NO 24 <br /> 0E01.001C & ENVIRONMENTAL SERVICES <br />