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UNIFIED SOIL CDASSIFICA TION SYSTEM <br /> MAJOR DIVISIONS ISYMEOLS TYPICAL NAMES <br /> �'a Well graded gravels or gravei-sand mixtures,little or no fines <br /> �, GRAVELS aar <br /> J � CP o tZ_- P=rly graded gravels or gravei-sand mixtures,little or no fines <br /> W MORE THAN 1/2 OF GM <br /> MORE THAN I/Z OF SM Suty-gravels, gravei-sand-silt mixtures <br /> rn cn COURSE FRAC-ION> <br /> Z S Na 4 SII~'/E SIZE GC Clayey gravels, gmei-sand-clay mixtures <br /> A <br /> -- N <br /> A SW Well graded sands or gravelly sands,little or no fines <br /> C? <br /> SANDS <br /> SP poorly graded sands or gravelly sands, little or no fines <br /> IND <br /> Q o= <br /> 0 u� ;I Silty sands, sand-silt mixtures <br /> o COARSE FRAC7770N C <br /> NO 4 SIEVE SIZE SIC Clayey sands, sand-clay mixtures <br /> ,,,organic ties and very fine sands,rock flow, silty or clayey <br /> w ML fine sands or clayey silts with slight Olasticity <br /> = SILTS & CLAYS <br /> CL ,,,organic days of law to mediums plasticity, gravelly clays, <br /> ttn sandy Clays, silty clays, Ilan clays <br /> Zacn a l <br /> �"L C"� OL !i! ! organic silts and organic silty clays of low piastiaty <br /> < MH Inorganic salts, micaceous or d,atamaceaus fine sandy or silty <br /> C7sails,elastic salts <br /> . e <br /> SILT5 & CLAYS <br /> Ia.1 a CH Inorganic clays of high plasticity, fat days <br /> Z 0 <br /> T_ j �7��0 O!„I �� Organic curs of medium to high plasticity,organic silty clays, <br /> organic silts <br /> HIGHLY ORGANIC SOILS I Pt Feat and other highly organic sails <br /> CLASSIFICLI-0 CHART <br /> RANGE OF GRAIN SIZES <br /> CLASSII"ICATICN U.S Standard Grain Size <br /> Sieve Size In Millime+ers <br /> EOULDE,RS 1 Above If Above 3705 <br /> COBBLES I2" to 3" k r05 to-t-6-2 <br /> GRAVEL to No.4 7-62 to 4 76 <br /> CCARSE 3 oto 3/4' —162,3191 <br /> FINE 3/4"to Na4 IS[ to 476 i <br /> SAND Noll to NO 200 176 to 0074 <br /> COARSE No 4 to No 10 4 76 to 2 00 <br /> 41EDIUM No l0 to No.40 2AO to 0 4z <br /> FINE Na--0 to No ZOO 0420 to 007= <br /> SILT a CLAY Below Na 200 I Below No 0 074 <br /> GFAIN SIZE CHART <br /> HUNTER & ASSOCIATES ATTACHMENT # 4 <br /> SACRAMENTO, CA <br />