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I <br /> w <br /> 16 <br /> METHOD OF SOIL CLASSIFICATION <br /> MAJOR DIVISIONS SYMBOLSTYPICAL NAMES <br /> GRAVELS Cw WELL GRADED GRAVELS OR GRAVEL-SAND MIXTURES LITTLE OR NO FINES <br /> cn <br /> J Cip °Q' POORLY GRADED GRAVELS OR GRAVEL-SAND MIXTURES LITTLE OR NO FINES <br /> O W 4 <br />' $ (MORE THAN 1/2 OF GM e� SILTY GRAVELS GRAVEL-SAND-SILT MIXTURES <br /> q N COARSE FRACTION > <br /> W z 140 4 SIEVE SIZE) pP <br /> Z G C o CLAYEY GRAVELS GRAVEL-SAND-CLAY MIXTURES <br /> r-M <br /> rp <br /> L3 � SW 1*{� WELL GRADED SANDS OR GRAVELY SANDS LITTLE OR NO FINES <br /> N <br /> SANDS { <br /> N' z Sp POORLY GRADED SANDS OR GRAVELY SANDS LITTLE OR NO FINES< z <br /> d = <br /> uW (MORE THAN 1/ OF <br /> COARSE FRACTION < SM SILTY SANDS SAND-SILT MIXTURES <br /> U o <br /> NO 4 SIEVE SIZE) <br /> Sc CLAYEY SANDS SAND-CLAY MIXTURES <br /> 1INORGANIC SILTS AND VERY FINE SANDS ROCK FLOWER SILTY OR CLAYEY <br /> H <br /> ML i FINE SANDS OR CLAYEY SILTS WITH SLIGHT PLASTICITY <br /> > SILTS & CLAYS <br /> INORGANIC CLAYS OF LOW TO MEDIUM PLASTICITY GRAVELY CLAYS <br /> (� g <br /> CL SANDY CLAYS SILTY CLAYS LEAN CLAYS <br /> LL<50 <br /> A OL ORGANIC SILTS AND ORGANIC SILTY CLAYS OF LOW PLASTICITY <br /> Q INORGANIC SILTS MICACEOUS OR DIATOMACECOUS FINE SANDY OR SILTY <br /> MH SOILS ELASTIC SILTS <br /> L N SILTS & CLAYS <br /> LTJ = CHVINIORGANIC CLAYS OF HIGH PLASTICITY FAT CLAYS <br /> z LL>50 <br /> LAYS OF MEDIUM TO HIGH PLASTICITY ORGANIC SILTY CLAYS <br /> ILTS <br /> HIGHLY ORGANIC S❑ILS PtOTHER HIGHLY ORGANIC SOILS <br />' CLASSIFICATI❑N CHART <br /> ( UNIFIED SOIL CLASSIFICATION SYSTEM > <br />' RANGE OF GRAIN SIZES <br /> CLASSIFICATION US STANDARD GRAIN SIZE SANDS AND GRAVELS BLOWS/FOOT <br /> SIEVE SIZE IN MILLIMETERS <br />' VERY LOOSE 0 - a <br /> BOULDERS ABOVE 12 ABOVE 13 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 70 476 VERY DENSE OVER 5C <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 4760 TO OC74 SILTS AND CLAYS BLOWS/FCOT <br /> COARSE NO 4 TO NO 10 4 760 TC 2000 <br /> MEDIUM NO 10 TO NO 40 2000 TO 0420 VERY SOFT 0 - 2 <br /> FINE NO 40 TO NO 200 0420 TO 0074 <br /> SOFT 2 - 4 <br /> SILT & CLAY BELOW NO 206 BELOW 0074 MEDIUM STIFF 4 - 8 <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 CONSISTENCY <br /> 2 INCH O D (I-3/6 INCH I D) SPLIT SPOON (ASTM D-1586) <br />' PAGE ❑F <br />