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r r <br /> AWALB <br /> METHOD OF SOIL CLASSIFICATION <br /> MAJOR DIVISIONS SYMBOLS1 TYPICAL NAMES <br /> G W WELL GRADED GRAVELS OR GRAVEL-SAND MIXTURES, LITTLE OR No FINES <br /> y GRAVELS .4 <br /> W Gp n POORLY GRADED GRAVELS OR GRAVEL-SAND MIXTURES, LITTLE OR NO FINES <br /> I] > 4' <br /> ' u <br /> �N c►aRE THAN L2 OF a GM SILTY GRAVELS. GRAVEL-SAND-SILT MIXTURES <br /> i COARSE FRACTIOII > <br /> LJ NII, 4 SIEVE SIM c <br /> Z_ GC a CLAYEY GRAVELS, GRAVEL-SAND-CLAY MIXTURES <br /> Q a <br /> t'� SV,/ � WELL GRADED SANDS OR GRAVELY SANDS, LITTLE OR NO FINES <br /> Ll SANDS <br /> V)" Sp POORLY GRADED SANDS OR GRAVELY SANDS LITTLE OR N1 FINES <br /> Q � <br /> O w ( AM li <br /> THAM OF <br /> V SM SILTY SANDS, SAND-SILT MIXTURES <br /> m COARSE FRACTION< <br /> NO. 4 SIEVE SIZE) <br /> ' SC CLAYEY SANDS, SAND-CLAY MIXTURES <br /> u INORGANIC SILTS AND VERY FINE SANDS ROCK FLOWER SILTY OR CLAYEY <br /> V1 " ML � � � FINE SANDS OR CLAYEY SILTS WITH SLIGHT PLASTICITY <br /> W SILTS & CLAYS <br /> 0 « INORGANIC CLAYS OF LOW TO MEDIUM PLASTICITY GRAVELY CLAYS <br /> V) LL<50 CL SANDY CLAYS, SILTY CLAYS, LEAN CLAYS <br /> i <br /> L ❑L :::,i ORGANIC SILTS AND ORGANIC SILTY CLAYS OF LOW PLASTICITY <br /> i' <br /> Q INORGANIC SILTS MICACEOUS OR DIATOMACECOUS FINE SANDY 13R SILTY <br /> SILTS & CLAYS MH SOILS ELASTIC SILTS <br /> La CH INORGANIC CLAYS OF HIGH PLASTICITY FAT CLAYS <br /> z LL>50 <br /> LL iiiORGANIC CLAYS OF MEDIUM TO HIGH PLASTICITY ORGANIC SILTY CLAYS, <br /> $ ❑H ��. ORGANIC SILTS <br /> HIGHLY ORGANIC SOILS Pt PEAT AND OTHER HIGHLY ORGANIC SOILS <br /> CLASSIFICATION CHART <br /> C UNIFIED SOIL CLASSIFICATION SYSTEM ) <br /> RANGE OF GRAIN SIZES <br /> CLASSIF'ICATI❑N US. STANDARD GRAIN SIZE SANDS AND GRAVELS BL❑VS/FCIOT <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 4 76 VERY DENSE OVER 50 <br /> C13ARSE 3' TO 1/4' 762 TO 19l <br /> FINE 3/4' TO NO, 4 191 TO 476 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 2 000 <br /> MEDIUM NO. LO TO NO. 40 2000 TO 0420 VERY SOFT 0 - 2 <br /> FINE NOL 40 TO NO 200 0420 TO 0074 <br /> SOFT 2 - 4 <br /> SILT 8 CLAY BELOW NO 2ao BELOW 0074 <br /> 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 OD a-3/8 INCH ID) SPLIT SPOON (ASTM D-1586) <br /> ' PAGE ❑F <br />