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' UNIFIED SOIL CLASSIFICATION SYSTEM <br /> MAJOR DIVISIONS SYMBOLS CODE TYPICAL NAMES <br /> GW o 6'2 Well graded gravels or gravel -- sand mixtures little or no fines <br /> GRAVELS <br /> v1 = GP o q o Poorly graded grovels or gravel — sand mixtures, little or no fines <br /> 3L <br /> (More than 1/2 of 4 O <br /> In w coarse fraction > GM Silty grovels, gravel — sand — silt mixtures 0 <br /> o N no 4 sieve size) <br /> N GC Clayey gravels, gravel — sand — clay mixtures <br /> of <br /> L o SW + ' + ' Well graded sands or gravelly sands little or no fines <br />' ``' " 04 SANDS ' <br /> a o °c (More than 1/2 of SP Poorly graded sands or gravelly sands little or no fines <br /> Q � <br /> coarse fraction < Sly{ 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 />' in °m N CL Inorganic clays of low to medium plasticity, gravelly clays, <br /> o — in sandy clays silty clays, lean clays <br /> U) a N LL < 50 <br /> o m OL Organic silts and organic silty clays of low plasticity <br />' z i^ <br /> a o a 1 l i l 1 l Inorganic salts micaceous or diatomaceous fine sandy <br /> QE wo J N SILTS & CLAYS MH I I I i i i i i t i i or silty sods, elastic silts <br /> Ld m <br /> 0 <br /> C CH inorganic clays of high plasticity fat clays <br />' LL > 5D <br /> OH Organic clays of medium to high plasticity organic <br /> silty clays organic silts <br /> HIGHLY ORGANIC SOILS Pt — -- 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' U S Standard Grain Size <br /> Very Soft < 3 Very Loose < 5 Sieve size in Millimeters <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 76 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 4 76 <br /> Hard > 40 <br /> `Stows/ft—lower 12 inch interval of drive or as noted SAND No 4 to No 200 4 76 to 0 074 <br /> 140 Ib hammer 30" drop California Sampler coarse (c) No 4 to No 10 4 7B 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 0074 <br />' SILT & CLAY Below No 200 Below 0 074 <br /> Q W Sod Sample <br /> 't= Initial Water Level <br /> _ — Final Water Level <br /> = Estimated or gradational material <br /> change line <br /> = Observed material change line <br /> 1 <br /> SOIL CLASSIFICATION CHARTS WKA NO 2088 03 <br /> NN*ii GRANITE CONSTRUCTION DATE 4/93 <br /> WALLACE • KUHL & ASSOCIATES, INC <br /> GEOTECHNICAL ENGINEERING French Camp, California PLATE NO 24 <br /> GEOLOGIC & ENVIRONMENTAL SERVICES <br />