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v <br /> Unified Soil Classification System <br /> Group <br /> Primary Divisions Symbol/Graphic Typical Names <br /> COARSE GRAVELS CLEAN ° a <br /> G o Well graded gravels, gravel-sand mixtures, little or no fines <br /> GRAINED GRAVELS ° <br /> SOILS half of <br /> coarse G <br /> fraction <br /> (less than GP a Poorly graded gravels or gravel-sand mixtures; little or no <br /> more than 5% fines) o <br /> half is larger than tines <br /> larger than *4 sieve alo <br /> GRAVEL G M <br /> X200 sieve °,° Silty gravels, gravel-sand-silt mixtures <br /> FINES G C Clayey gravels, gravel-sand-clay mixtures <br /> SANDS CLEAN S W Well graded sands, gravelly sands, little or no fines <br /> SANDS <br /> half of <br /> coarse (less than <br /> fraction 5% 5nes) SP Poorly graded sands or gravelly sands, little or no fines <br /> smaller <br /> than #4i <br /> sieve SANDS S M+ :�.�I Silty sands, sand-silt mixtures <br /> WITH <br /> I <br /> FINES SC�//1 Clayey sands, sand-c!ay mixtures, plastic nnes <br /> FINE SILTS AND CLAYS <br /> M L) i inorcanic silts and very ;;ne sand, rock flour, silty or c4 ayey <br /> GRAINED I j fine sands or clayey sifts, with slight plasticity <br /> SCILS licuid limitA <br /> less than 50°o �' L//1 Inorganic clays of low to medium plasticity, gravelly �:ays, <br /> more than <br /> K/" sancy clays, silty clays, lean clays <br /> half is 0 J/� Organic silts and organic silty c!ays of low plasticity <br /> smaller <br /> than X200 i <br /> sieve SILTS AND CLAYS M Hl Inorganic silts, imicaceous or diatomaceous tine sandy or slit,, <br /> soils, clastic silts <br /> licuid limit <br /> more !Man 500% C H Inorganic clays of high ciasticity, fat clays <br /> A <br /> H Organic clays of , Medium -,o high plasticity, organic silts <br /> HIGr'LY CRG.AMIC SOILS i P t ; , Peat and other iighly cr =nic sciis <br /> ti <br /> Pacific 'nor mmental Group, Inc. <br /> �I <br />