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DEFINITION OF TERMS <br />PRIMARY DIVISIONS <br />SYMBOLS <br />SECONDARY DIVISIONS <br />-� <br />GRAVELS <br />CLEAN <br />'O <br />GW <br />Well graded gravels, gravel -sand mixtures, little or no <br />to <br />MHOARLEFTHHAN <br />GRAVELS <br />fines. <br />'gr; ; ; <br />GP <br />Poorly graded gravels or gravel -sand mixtures, little or <br />CC 0 <br />OF <br />(LESS THAN <br />0 < cv <br />COARSE <br />b% FINES) <br />A• <br />no fines. <br />GM <br />Silty gravels, gravet-sand-silt mixtures, non -plastic <br />20 <br />FRACTION IS <br />C3 a. Z W <br />GRAVEL <br />fines. <br />W O Z N <br />« <br />LARGER THAN <br />NO. 4 SIEVE <br />WITH FINES <br />0�9. <br />GO <br />Clayey gravels, gravel -sand -clay mixtures, plastic <br />LL <br />fines. <br />0 y ¢ w <br />SANDS <br />SSANDS <br />SW <br />Well graded sands, gravelly sands, tittle or no fines. <br />t17 a W N <br />coHALF <br />MORE THAN <br />(LESS THAN <br />OF <br />b% FINES) <br />° ° <br />SP <br />gravelly <br />Poorly graded sands or ravels sands, little or no fines. <br />CCCC j--< <br />1 <br />COARSE <br />. <br />O ¢ Co <br />FRACTION IS <br />SANDS <br />SM <br />Silty sands, sand -silt mixtures, non -plastic fines. <br />UO <br />SMALLER THAN <br />WITH FINES <br />2 <br />NO. 4 SIEVE <br />SC <br />Clayey sands, sand -clay mixtures, plastic tines.. <br />J u. m N <br />ML <br />inorganic silts and veryfins sands, rock (four, siltyy or <br />� O a rn <br />SILTS AND CLAYS <br />clayey fine sands or clayey slits with slight plasticity. <br />N y <br />LiOUFD LIMIT t5 <br />GL <br />Irsorgantc clays of low to medium plasticity, gravelly <br />p < 2 w <br />2 to rn <br />LESS THAN b0% <br />clays. sandy clays, lean clays. <br />W <br />OL <br />Organic silts and organic silty clays of low plasticity. <br />Z 2 0 O <br />a <br />q = <br />MH <br />Inorganic silts, micaceous or diatemaceous fine sandy <br />it h 4 C+ <br />SILTS AND CLAYS <br />or Bitty sails, elastic silts. <br />0wF2 <br />M W <br />Z <br />LIOUID LIMIT IS <br />CH <br />Inorganic clays of high plasticity, fat clays. <br />g a ¢ <br />GREATER THAN 50% <br />iz M H <br />��� / <br />OH <br />Oiigsanic clays of medium to high plasticity, organic <br />HIGHLY ORGANIC SOILS <br />Pt <br />Peat and other highly organic soils. <br />GRAIN SIZES <br />SILTS AND CLAYS <br />SAND <br />GRAVEL <br />C068LES <br />BOI;LDERS <br />FINEI <br />MEDIUM O CARSE <br />FINE <br />I COARSE <br />200 40 10 4 3/4' 3' 12" <br />U.S. STANDARD SERIES SIEVE CLEAR SOUARE SIEVE OPENINGS <br />RELATIVE DENSITY <br />SANDS, GRAVELS AND <br />NON -PLASTIC SILTS <br />BLOWS/FOOT* <br />VERY LOOSE <br />0-4 <br />LOOSE, <br />4 - 10 <br />MEDIUM DENSE <br />10 - 30 <br />DENSE <br />30 - 50 <br />VERY DENSE <br />OVER 50 <br />CONSISTENCY <br />CLAYS AND <br />PLASTIC SILTS <br />STRENGTH** <br />BLOWS/FOOT* <br />VERY SOFT <br />0- 1/4 <br />0 - 2 <br />SOFT <br />1/4 - 1/2 <br />2-4 <br />FIRM <br />1/2 - 1 <br />4 - 8 <br />STIFF <br />1 - 2 <br />8 - 18 <br />VERY STIFF <br />2- 4 <br />18 - 32 <br />HARD <br />OVER 4 <br />OVER 32 <br />*NUMBER OF BLOWS OF 140 POUND HAMMER FALLING 30-INCHES TO DRIVE A 2-INCH O.D. <br />(1-3/8-INCH LD.) SPLIT SPOON (ASTM D-1586). <br />**UNCONFINED COMPRESSIVE STRENGTH IN TONS/SO. FT. AS DETERMINED BY LABORATORY <br />TESTING OR APPROXIMATED BY THE STANDARD PENETRATION TEST (ASTM D-1588), POCKET <br />PENETROMETER, TORVANE, OR VISUAL OBSERVATION <br />KEY TO LOGS <br />INC. <br />