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UNIFIED SOIL CLASSIFICATION SYSTEM <br /> MAJOR DIVISIONS SYMBOLS CODE TYPICAL NAMES <br /> GRAVELS GW o d o Well groded gravels or gravel — sand mixtures, little or no fines <br /> J o a (More than 1/2 of GP 4 0 4 o Poorly graded gravels or gravel — sand mixtures little or no fines <br /> 0 h N <br /> o a coarse fraction > GM Silty gravels gravel — sand — silt mixtures <br />' d N no 4 sieve size) - <br /> ay GC Clayey gravels grovel — sand — clay mixtures <br /> c <br /> a SW SANDS Well graded sands or gravelly sands little or no fines <br /> W � ' <br /> o c SP Poorly graded sands or gravelly sands little or no fines <br /> p A (More than 1/2 of <br /> coarse fraction < SM Silty sands sand — silt mixtures <br /> no 4 sieve size) - 111111111111 <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 /> � <br /> _ N 'Z CL Inorganic clays of low to me&LM plasticity gravelly clays <br />' o ° a, LL < 50 sandy clays silty clays lean clays <br /> 0 <br /> o OL Organic slits and organic silty days of low plasticity <br /> Z v' <br />' Cr 0 111111111111 Inorganic silts micaceous or diatomaceous fine sandy <br /> `� �' SIL FS & CLAYS MH 111111111111 or silty soils elastic silts <br /> 0 <br /> C <br /> CH Inorganic clays of high plasticity fat clays <br />' LL > 50 MEM,�\11� <br /> OH \111��\1111 Organic clays of medium to high plasticity organic <br /> silty clays organic slits <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 Glows/ftp US Standard Gram Size <br /> Very Soft < 3 Very Loose < 5 Sieve size m Millimeters <br />' <br /> BOULDERS 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 762 <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 /> Hard > 40 fine (f) 3/4 to No 4 191 to 476 <br /> "Blows/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 Caiifornio Sampler coorse (c) No 4 to No 10 4 76 to 2 00 <br /> madivm (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 /> = Soil Sompfe SILT & CLAY Below No 200 Below G 074 <br /> Q <br /> as= Initial Water Level <br /> Final Water Level <br /> Estimated or gradat:oval materiat <br /> change line <br /> Observed material change line <br /> SOIL CLASSIFICATION CHARTS WKA NO 1628 01 <br /> 404 West Fremont Street DAA E 2/93 <br /> WALLACE • KUHL & ASSOCIATES INC <br /> GEOTECHNICAL ENGINEERING} Stockton, Callforrlla PLATE NO 7 <br /> GROLOOIC & ENVIRONMENTAL SERVICES <br />