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WATER WORK <br />METHOD OF SOIL CLASSIFICATION <br />MAJOR DIVISIONS <br />SYMBOLS1 <br />US, STANDARD <br />TYPICAL NAMES <br />CLASSIFICATION <br />4 - LO <br />GW <br />5 <br />WELL GRADED GRAVELS OR GRAVEL -,AND MIXTURES, LITTLE OR NO FINES <br />ABOVE 12' <br />GRAVELS <br />COBBLES <br />Q,. <br />305 TO 76.2 <br />J W <br />3' TO NO. 4 <br />G p <br />oiac <br />POORLY GRADED GRAVELS OR GRAVEL -SAND MIXTURES. LITTLE OR NO FINES <br />w <br />FINE <br />3/4' TO NO, 4 <br />o.. <br />SAND <br />NO. 4 TO NO, 200 <br />cMCRE THAN 1/2 OF <br />GM <br />NO. 4 TO NO, LO <br />SILTY GRAVELS, GRAVEL—SAND—SILT MIXTURES <br />Q z <br />COARSE FRACTION > <br />2.000 TO 0.420 <br />FINE <br />NO. 40 TO NO. 200 <br />W 0 <br />NO. 4 SIEVE SIZE) <br />BELOW NO. 200 <br />O <br />Z ` <br />GC <br />p <br />CLAYEY GRAVELS, GRAVEL -SAND -CLAY MIXTURES <br />J <br />�;My <br />o <br />Sw <br />WELL GRADED SANDS OR GRAVELY SANDS, LITTLE OR NO FINES <br />SANDS <br />;. <br />N <br />\ <br />0 <br />SP°*' <br />POORLY GRADED SANDS OR GRAVELY SANDS, LITTLE OR NO FINES <br />Q <br />ay' <br />❑ <br />L) <br /><NaRE THAN 1/z OF <br />SM <br />SILTY SANDS, SAND -SILT MIXTURES <br />COARSE FRACTION < <br />333 <br />NO. 4 SIEVE SIZE) <br />SC <br />CLAYEY SANDS, SAND -CLAY MIXTURES <br />ML <br />INORGANIC SILTS AND VERY FINE SANDS. ROCK FLOWER, SILTY OR CLAYEY <br />W <br />SILTS 2, CLAYS <br />FINE SANDS OR CLAYEY SILTS WITH SLIGHT PLASTICITY <br />7 N <br />CL <br />INORGANIC CLAYS OF LOW TO MEDIUM PLASTICITY, GRAVELY CLAYS, <br />0 $ <br />SANDY CLAYS, SILTY CLAYS, LEAN CLAYS <br />LL<50 <br />OL <br />i iii <br />ORGANIC SILTS AND ORGANIC SILTY CLAYS OF LOW PLAS7ICITY <br />W <br />Q C3INORGANIC <br />SILTS, MICACEDUS OR DIATOMACECOUS FINE SANDY OR SILTY <br />O <br />MH <br />SOILS, ELASTIC SILTS <br />N <br />SILTS CLAYS <br />CH <br />INORGANIC CLAYS OF HIGH PLASTICITY, FAT CLAYS <br />LL>50 <br />,, <br /><L <br />OH <br />ORGANIC CLAYS OF MEDIUM TO HIGH PLASTICITY, ORGANIC SILTY CLAYS, <br />%/ <br />ORGANIC SILTS <br />HIGHLY ORGANIC SOILS <br />Pt <br />PEAT AND OTHER HIGHLY ORGANIC SOILS <br />CLASSIFICATION CHART <br />< UNIFIED SOIL CLASSIFICATION SYSTEM > <br />GRAIN SIZE CHART <br />SANDS AND GRAVELS <br />RANGE OF GRA[N SIZES <br />US, STANDARD <br />GRAIN SIZE <br />CLASSIFICATION <br />4 - LO <br />SIEVE SIZE <br />IN MILLIMETERS <br />BOULDERS <br />ABOVE 12' <br />ABOVE 13' <br />COBBLES <br />12' TO 3' <br />305 TO 76.2 <br />GRAVEL <br />3' TO NO. 4 <br />76.2 TO 4,76 <br />COARSE <br />3' TO 1/4' <br />762 TO L9.1 <br />FINE <br />3/4' TO NO, 4 <br />L9.1 TO 4.76 <br />SAND <br />NO. 4 TO NO, 200 <br />4,760 TO 0.074 <br />COARSE <br />NO. 4 TO NO, LO <br />4.760 TO 2.000 <br />MEDIUM <br />NO. LO TO NO. 40 <br />2.000 TO 0.420 <br />FINE <br />NO. 40 TO NO. 200 <br />1420 TO 0.074 <br />SILT 8 CLAY <br />BELOW NO. 200 <br />BELOW 0-074 <br />GRAIN SIZE CHART <br />SANDS AND GRAVELS <br />BLOWS/FOOT <br />VERY LOOSE <br />0 - 4 <br />LOOSE <br />4 - LO <br />MEDIUM DENSE <br />10 - 30 <br />DENSE <br />30 - 50 <br />VERY DENSE <br />OVER 50 <br />RELATIVE DENSITY <br />SILTS AND CLAYS <br />BLOWS/FOOT <br />VERY SOFT <br />0 - 2 <br />SOFT <br />2 - 4 <br />MEDIUM STIFF <br />4 - 8 <br />STIFF <br />8 - 16 <br />VERY STIFF <br />16 - 32 <br />HARD <br />OVER 32 <br />+ NUMBER OF BLOWS OF 140 POUND HAMMER FALLING 30 INCHES TO DRIVE A CONSISTENCY <br />2 INCH O.D. (1-3/8 INCH I.D.) SPLIT SPOON (ASTM 0-1586). <br />