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METHOD OF SOIL CLASSIFICATION <br /> ' MAJOR DIVISIONS SYMBOLS TYPICAL NAMES <br /> � C)w WELL GRADED GRAVELS OR GRAVEL-SAND MIXTURES, LITTLE OR NO FINES <br /> W GRAVELS <br /> N O <br /> H G P °Q' POORLY GRADED GRAVELS OR GRAVEL-SAND MIXTURES LITTLE OR NO FINES <br /> _ w <br /> W <br /> ' N <br /> o <br /> (MORE THAN 1/2 QF GM SILTY GRAVELS GRAVEL-SAND-SILT MIXTURES <br /> Q S'i COARSE FRACTION > <br /> L z NO 4 SIEVE SIZE) oa <br /> M <br /> GC o CLAYEY GRAVELS GRAVEL-SAND-CLAY MIXTURES <br /> 1 <br /> L7 � S,„/ ';T� WELL GRADED SANDS OR GRAVELY SANDS, LITTLE OR NO FINES <br /> b <br /> w SANDS <br /> = SP t` POORLY GRADED SANDS OR GRAVELY SANDS LITTLE OR NII FINES <br /> ' Qx <br /> Ow (MORE THAN 1/2 OF <br /> i COARSE FRACTION C S M SILTY SAN➢S SAND-SILT MIXTURES <br /> NO 4 SIEVE SIZE) <br /> SC CLAYEY SANDS SAND-CLAY MIXTURES <br /> 1 n ii <br /> INdRGANIC SILTS AND VERY FINE SANDS ROCK FLOWER SILTY OR CLAYEY <br /> u <br /> ML FINE SANDS OR CLAYEY SILTS WITH SLIGHT PLASTICITY <br /> SILTS & CLAYS <br /> Q .4 n C L INORGANIC CLAYS OF LOW TO MEDIUM PLASTICITY GRAVELY CLAYS <br /> LL<50 SANDY CLAYS SILTY CLAYS LEAN CLAYS <br /> Q OL ORGANIC SILTS AND ORGANIC SILTY CLAYS OF LOW PLASTICITY <br /> Z <br /> H M H INORGANIC SILTS MICACEOUS OR DIATOMACECOUS FINE SANDY OR SILTY <br /> L- N SILTS & CLAYS solLs ELASTIC SILTS <br /> Z CH INORGANIC CLAYS OF HIGH PLASTICITY FAT CLAYS <br /> Z LL>50 <br /> ORGANIC CLAYS OF MEDIUM TO HIGH PLASTICITY ORGANIC SILTY CLAYS <br /> g OH ORGANIC SILTS <br /> HIGHLY ORGANIC SOILS Pt / PEAT AND OTHER HIGHLY ORGANIC SOILS <br /> ' CLASSIFICATION CHART <br /> ( UNIFIED SOIL CLASSIFICATION SYSTEM ) <br /> ' RANGE OF GRAIN SIZES <br /> CLASSIFICATI❑N US STANDARD GRAIN SIZE SANDS AND GRAVELS BLOWS/FOOT <br /> SIEVE SIZE IN MILLIMETERS <br /> ' - <br /> BOULDERS ABOVE 12' ABOVE 13' VERY LOOSE 0 4LOOSE 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 476 VERY DENSE OVER 50 <br /> COARSE 3 TO 1/4 762 TO 191 <br /> FINE 3/4 TO NO 4 191 TO 476 RELATIVE DENSITY <br /> SAND NO 4 TO NO 200 4 760 TO 0 074 <br /> COARSE NO 4 TO NO 10 4760 TO 2000 SILTS AND CLAYS BLOWS/FOOT <br /> MEDIUM NO. 10 TO NO 40 2000 TO 0420 VERY SOFT 0 - 2 <br /> FINE NO. 40 TO NO 290 0420 TO 0074 <br /> SOFT 2 - 4 <br /> SILT & CLAY--t BELOW NO 200 BELOW 0074 MEDIUM STIFF 4 - 8STIFF 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 CONSISTENCY <br /> INCH O D (1-3/8 INCH ID) SPLIT SPOON (ASTM D-1586) <br /> ' PAGE OF <br />