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UNIFIED SOIL CLASSIFICATION SYSTEM(USCS) <br /> (From USACE Tech Memo 3-357) <br /> MAJOR DIVISIONS GROUP/GRAPHIC TYPICAL DESCRIPTION <br /> SYMBOL <br /> GW ' Well-graded ravels,ggravels, <br /> ' graver/sand rixtures,little or no fines. <br /> Clean Gravels <br /> (less than 5% <br /> Gravels fines) GP Poorly graded gravels,gravel-sand <br /> (more than 50% <br /> mixtures,little or no fines <br /> �- '- <br /> of coarse Im <br /> fraction retainedGM ' Silt ravels, ravel47 -sand-silt mixtures <br /> on No.4 sieve) Gravels with y g g <br /> Fines <br /> (more than 12% / <br /> / Clayey gravels,gravel-sand-clay <br /> GRAINED fines) GC <br /> mixtures <br /> SOILS <br /> (more than 50% <br /> retained on No. SW Well-graded sands,gravelly sands, <br /> 200 sieve) Clean Sands little or no fines <br /> (less than 5% <br /> fines) Poorly graded sand,gravelly sands, <br /> Sands SP little or no fines <br /> (50%or more of <br /> coarse fraction <br /> passes the No.4 <br /> sieve) Sands with SM " Silty sands,sand-silt mixtures <br /> Fines <br /> (more than 12% <br /> fines) SC / Clayey sands,sand-clay mixtures <br /> Inorganic silts of low to medium <br /> ML plasticity,r..k flour,sandy silts, <br /> gravelly silts,or clayey silts with slight <br /> Inorganic i plasticit <br /> Silts and Clays j%%' Inorganic clays of low to medium <br /> /,; <br /> (liquid limit less CL / plasticity,gravelly clays,sandy clays, <br /> than 50) �X silty clays,lean clays <br /> FINE-GRAINED Organic OL Or anic.silts and organic silty clays of <br /> SOILS P y <br /> (50%or more <br /> passes the No. Inorganic silts,micaceous or <br /> 200 sieve) MH diatomaceous fine sands or silty soils, <br /> elastic silt <br /> Inorganic <br /> Silts and Clays Inorganic clays of medium to high <br /> (liquid limit 50 or CH plasticity,sandy fat clay,or gravelly fat <br /> more) clay <br /> Organic OH plasticity clays of <br /> medium to high <br /> HIGHLY- Primarily organic matter,dark in '. Peat,humus,swamp soils with high <br /> ORGANIC color,and organic odor PT organic content(see ASTM D 4427) <br /> SOILS <br /> NOTE: No.4 size=5 mm; No.200 size=0.075 mm <br /> m <br /> N <br /> H <br /> 14th St& 16th St-Marina District <br /> ZPort of Everett <br /> NOTES Everett,Washington <br /> 1.Dual symbols(symbols separated by a hyphen.i.e..SP-SM,slightly <br /> silty fine SAND)are used for soils with between 5%and 12%fines SOIL CLASSIFICATION <br /> or when the liquid limit and plasticity index values plot in the CL-ML <br /> N area of the plasticity chart. AND LOG KEY <br /> N <br /> N <br /> a 2.Borderline symbols(symbols separated bya slash,i.e., CL/ML,silty January 2014 21-1-21761-003 <br /> CLAY/clayey SILT.GW/SW sandy GRAVEUgravelly SAND) <br /> Z indicate that the soil may fall into one of two possible basic groups. SHANNON&WILSON INC. FIG.A-1 <br /> p Geotechnical and Environmental Consultants Sheet 2 of 2 <br /> m <br />