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t <br /> • L I <br /> METHOD OF SOIL CLASSIFICATION <br /> MAJOR DIVISI❑NS SYMBOLS TYPICAL NAMES <br /> G w WELL GRADED GRAVELS OR GRAVEL-SAND MIXTURES LITTLE OR NO FINES <br /> W GRAVELS <br /> J = I <br /> " G P POORLY GRADED GRAVELS OR GRAVEL-SAND MIXTURES LITTLE OR NO FINES <br /> W OC <br /> � o•o <br /> H (MORE THAN 1/2 OF <br /> GM SILTY GRAVELS GRavEL-SAND-SILT MIxTURES <br /> Ri COARSE FRACTION ) <br /> LI ti NO 4 SIEVE SIZE) o <br /> Z Z G C o CLAYEY GRAVELS GRAVEL-SAND-CLAY MIXTURES <br /> Q J 'J <br /> LD " S W t�,t WELL GRADED SANDS OR GRAVELY SANDS LITTLE OR NO FINES <br /> SANDS �' <br /> N <br /> (/I S P �t POORLY GRADED SANDS OR GRAVELY SANDS LITTLE OR NO FINES <br /> a q <br /> Q m <br /> Q W CHORE THAN 1/4 OF <br /> I__) o COARSE FRACTION < SM SILTY SANDS SAND-SILT MIXTURES <br /> = NO 4 SIEVE SIZE) <br /> S c CLAYEY SANDS SAND-CLAY MIXTURES <br /> INORGANIC SILTS AND VERY FINE SANDS ROCK FLOWER SILTY OR CLAYEY <br /> J > SILTS & CLAYS ML FINE SANDS OR CLAYEY SILTS WITH SLIGHT PLASTICITY <br /> INORGANIC CLAYS OF LOW TO MEDIUM PLASTICITY GRAVELY CLAYS <br /> Imo ' LL<50 CL SANDY CLAYS SILTY CLAYS LEAN CLAYS <br /> LLJ A 2 ❑L ii ORGANIC SILTS AND ORGANIC SILTY CLAYS OF LOW PLASTICITY <br /> Z63 <br /> � <br /> _ J <br /> INORGANIC SILTS MICACEOUS OR DIATOMACECOUS FINE SANDY OR SILTY <br /> L N SILTS & CLAYS MH solLs ELASTIC slLrs <br /> LJ = CH INORGANIC CLAYS OF HIGH PLASTICITY FAT CLAYS <br /> Z LL>50 <br /> ORGANIC CLAYS OF MEDIUM TO HIGH PLASTICITY ORGANIC SILTY CLAYS <br /> ❑H i�f ORGANIC SILTS <br /> HIGHLY ORGANIC SOILS Pt PEAT AND OTHER HIGHLY ORGANIC SOILS <br /> CLASSIFICATI❑N CHART <br /> ( UNIFIED SOIL CLASSIFICATION SYSTEM ) <br /> RANGE GE GRAIN SIZES <br /> CLASSIFICATION US STANDARD GRAIN SIZE SANDS ANIS GRAVELS BLOWS/FOIIT <br /> SIEVE SIZE IN MILLIMETERS <br /> VERY LOOSE D - 4 <br /> BOULDERS ABOVE 12 ABOVE 13 <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 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 4760 TO 0074 SILTS AND CLAYS BLOWS/FCOT <br /> COARSE NO 4 TO NO IO 4760 TO 2000 <br /> MEDIUM NO 10 TO NO 40 2 OQQ TO 0 420 <br /> FINE NO 40 TO NO 200 VERY SOFT O - 2 <br /> a a20 TO 0 07a <br /> SOFT 2 - a <br /> MEDIUM STIFF 4 - B <br /> SILT & CLAY BELOW NO 200 BELOW 0074 <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 (1-3/8 INCH ID) SPLIT SPOON (ASTM D-1586) <br /> PAGE OF <br />