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METHOD OF SOIL CLASSIFICATION <br />MAJOR DIVISIONS <br />ISYMBOLS1 <br />TYPICAL NAMES <br />u.5. STANDARD <br />GRAIN SIZE <br />i G1„/ <br />SIEVE SIZE <br />WELL GRADED GRAVELS OR GRAVEL -SAND MIXTURES. LITTLE OR N13 FINES <br />BOULDERS <br />GRAVELS <br />E <br />o <br />�Q <br />I2' TO 31 <br />W <br />GRAVEL <br />j Gp <br />j <br />POORLY GRADED GRAVELS OR GRAVEL -SAND MIXTURES. LITTLE OR NO FINES <br />Q ? <br />76.2 TO 4.76 <br />COARSE <br />3' TO 1/4' <br />76,2 TO 19A <br />N w~g <br />p Fi <br /><N�TE THAN V2 OF <br />COARSE FRACTION <br />CIM <br />SAND <br />SILTY GRAVELS. GRAVEL -SAND -SILT MIXTURES <br />GC <br />o <br />c <br />CLAYEY GRAVELS GRAVEL -SAND -CLAY MIXTURES <br />L,1 C <br />Z <br />NO. 4 SIEVE S3ZD <br />NO. 10 TO NO. 40 <br />2,000 TO 0,420 <br />FINE <br />Na, 40 TO NO. 20C <br />0.420 TO 0.074 <br />Q J <br />BELOW NO. 200 <br />BELOV 0.074 <br />_ <br />O <br />S`„/� <br />WELL GRADED SANDS OR GRAVELY SANDS. LITTLE CR NO FINES <br />SANDS <br />La <br />V1 <br />SP ;u <br />POORLY GRADED SANDS OR GRAVELY SANDS. LITTLE OR NO FINES <br />Q <br />C3 W <br />U <br />OCRC THAN 1/2 OF <br />SM <br />SILTY SANDS, SAND -SILT MIXTURES <br />CIIARSE FRACTION <br />NG 4 SISVE SIZE) <br />SC <br />CLAYEY SANDS SAND -CLAY MIXTURES <br />u <br />ML <br />INORGANIC SILTS AND VERY FINE SANDS. ROCK FLOWER, SILTY OR CLAYEY <br />µ <br />SILTS 8. CLAYS <br />" <br />FINE SANDS OR CLAYEY SILTS VITH SLIGHT PLASTICITY <br />CL <br />INORGANIC CLAYS OF LOV Tp MEDIUM PLASTICITY• GRAVELY CLAYS. <br />Q ;, <br />LL<50 <br />SANDY CLAYS. SILTY CLAYS, LEAN CLAYS <br />CIL;; <br />ORGANIC SILTS AND ORGANIC SILTY CLAYS OF L13V PLASTICITY <br />Z d <br />INORGANIC SILTS, MICACEOUS CR DIATOMACECOUS FINE SANDY OR SILTY <br />U Z <br />SILTS & CLAYS <br />MH <br />SOILS. ELASTIC SILTS <br />CH <br />INORGANIC CLAYS OF HIGH PLASTICITY. FAT CLAYS <br />L61 <br />LL>50 <br />OH ii <br />CRGANIC CLAYS OF MEDIUM T13 HIGH PLASTICITY. ORGANIC SILTY CLAYS. <br />L <br />8 <br />�� <br />ORGANIC SILTS <br />HIGHLY ORGANIC SOILS <br />Pt <br />PEAT AND OTHER HIGHLY ORGANIC SOILS <br />CLASSIFICATIIN CHART <br />C UNIFIED SAIL CLASSIFICATION SYSTEM ) <br />GRAIN SIZE CHART <br />NUMBER OF BLOWS OF 140 POUND HAMMER FALLING 30 INCHES TO DRIVE A <br />2 INCH Q.D. (1-3/8 INCH I.D.) SPLIT SPOON CASTM D-1586). <br />SANDS AND GRAVELS <br />RANGE OF GRAIN SIZES <br />CLASSIFICATION <br />u.5. STANDARD <br />GRAIN SIZE <br />4 - IO <br />SIEVE SIZE <br />IN MILLIMETERS <br />BOULDERS <br />ABOVE 12' <br />ABOVE 13' <br />COBBLES <br />I2' TO 31 <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 />76,2 TO 19A <br />FINE <br />3/4' TO NO, 4 <br />19.1 TO 4.76 <br />SAND <br />NO. 4 TO NO. 200 <br />4.760 TO %074 <br />COARSE <br />NO. 4 TO NO. 10 <br />4,760 TO 2.000 <br />MEDIUM <br />NO. 10 TO NO. 40 <br />2,000 TO 0,420 <br />FINE <br />Na, 40 TO NO. 20C <br />0.420 TO 0.074 <br />SILT & CLAY <br />BELOW NO. 200 <br />BELOV 0.074 <br />GRAIN SIZE CHART <br />NUMBER OF BLOWS OF 140 POUND HAMMER FALLING 30 INCHES TO DRIVE A <br />2 INCH Q.D. (1-3/8 INCH I.D.) SPLIT SPOON CASTM D-1586). <br />SANDS AND GRAVELS <br />BLOWS/FOOT <br />VERY LOOSE <br />0 - 4 <br />LOOSE <br />4 - IO <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 />B - 16 <br />VERY STIFF <br />16 - 32 <br />HARD <br />OVER 32 <br />CONSISTENCY <br />PAGE ❑F <br />