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' METHOD OF SOIL CLASSIFICATION <br /> MAJOR DIVISIONS SYMBO Sl TYPICAL NAMES <br /> ' G w WELL GRADED GRAVELS OR GRAVEL-SAND MIXTURES, LITTLE OR NO FINES <br /> w GRAVELS <br /> N <br /> J w GP POORLY GRADED GRAVELS OR GRAVEL-SAND MIXTURES LITTLE OR NO FINES <br /> W <br /> N <br /> N e (MORE THAN V2 OF GM SILTY GRAVELS, GRAVEL-SAND-SILT MIXTURES <br /> p 4% COARSE FRACTION <br /> Ld5 N0. 4 SIEVE SIZE) c <br /> ' Z „ GC c CLAYEY GRAVELS. GRAVEL-SAND-CLAY MIXTURES <br /> Q <br /> N S <br /> Li SW ' WELL GRADED SANDS OR GRAVELY SANDS• LITTLE Ilft NO FINES <br /> Lia SANDS <br /> Sp POORLY GRADED SANDS OR GRAVELY SANDS, LITTLE OR NO FINES <br /> 1 Q <br /> Q w (MORE THAN 1/2 OF <br /> COARSE FRACTION [ SM SILTY SANDS, SAND-SILT MIXTURES <br /> N0. 4 SIEVE SIZE) <br /> Sc CLAYEY SANDS SAND-CLAY MIXTURES <br /> INORGANIC SILTS AND VERY FINE SANDS ROCK FLOWER, SILTY OR CLAYEY <br /> w SILTS & CLAYS ML FINE SANDS OR CLAYEY SILTS WITH SLIGHT PLASTICITY <br /> QH C L INORGANIC CLAYS OF LOW TO MEDIUM PLASTICITY GRAVELY CLAYS <br /> (49 LL<GO SANDY CLAYS, SILTY CLAYS, LEAN CLAYS <br /> Q g <br /> 4J OL ORGANIC SILTS AND ORGANIC SILTY CLAYS OF LOW PLASTICITY <br /> Z <br /> Q MH INORGANIC SILTS MICACEOUS DR DIATUMACECOUS FINE SANDY 12R SILTY <br /> L7 N SILTS & CLAYS solLs ELASTIC SILTS <br /> Z # ACHINORGANIC CLAYS OF HIGH PLASTICITY FAT CLAYS <br /> LL>Sa <br /> ORGANIC CLAYS OF MEDIUM TO HIGH PLASTICITY ORGANIC SILTY CLAYS, <br /> ORGANIC SILTS <br /> HIGHLY ORGANIC S❑ILSPEAT AND OTHER HIGHLY ORGANIC SOILS <br /> ' CLASSIFICATION CHART <br /> ( UNIFIED SOIL CLASSIFICATION SYSTEM ) <br /> ' RANGE OF GRAIN SIZES <br /> CLASSIFICATION U.S. STANDARD GRAIN SIZE SANDS AND GRAVELS BLOWS/FOOT <br /> ' SIEVE SIZE IN MILLIMETERS <br /> BOULDERS ABOVE 12 ABOVE 13' VERY LOOSE 0 - 4 <br /> LOOSE 4 - 10 <br /> COBBLES 12' TO 3' 305 TO 762 MEDIUM DENSE 10 - 30 <br /> DENSE 30 - 50 <br /> GRAVEL 3' TO NO 4 762 TO 4 76 VERY DENSE OVER 50 <br /> COARSE 3' TO 1/4' 762 TO 191 <br /> FINE 3/4 TO NIL 4 191 TO 4 76 <br /> RELATIVE DENSITY <br /> ' SAND NO 4 TO NO 200 4760 TO 0074 SILTS AND CLAYS BLOWS/FOOT <br /> COARSE NO 4 TO NO 10 4 760 TO 2000 <br /> MEDIUM NO. 10 TO NO 40 2000 TO 0 420 VERY SOFT 0 - 2 <br /> FINE NO. 40 TO NO ZOO 0 420 TO 0 074 <br /> SOFT 2 - 4 <br /> SILT & CLAY BELOW NO 200 BELOW 0074 MEDIUM STIFF 4 - B <br /> STIFF 8 - 16 <br /> GRAIN SIZE CHART VERY STIFF 16 - 32 <br /> HARD OVER 32 <br /> * NUMBER OF BLOWS OF 140 POUND HAMMER FALLING 30 INCHES TO DRIVE A <br /> 2 INCH OD (I-3/8 INCH ID) SPLIT SPOON (ASTM D-1586) CONSISTENCY <br /> PAGE OF <br />