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------------- <br /> I <br /> r � METHOD OF SOIL CLASSIFICATION <br /> 41 MAJOR DIVISI❑NS SYMBOLS TYPICAL NAMES <br /> GW WELL GRADED GRAVELS OR GRAVEL-SAND MIXTURES, LITTLE OR NO FINES <br /> ll N GRAVELS : <br /> GP ''o:' POORLY GRADED GRAVELS OR GRAVEL-SAND MIXTURES. LITTLE OR NO FINES <br /> �'� <br /> r- V) (MORE THAN 1/2 OFGM SILTY GRAVELS. GRAVEL-SAND-SILT MIXTURES <br /> COARSE FRACTION > r, <br /> LTJ d NO. 4 SIEVE SIZE) oP <br /> Z Z GC c CLAYEY GRAVELS, GRAVEL-SAND-CLAY MIXTURES <br /> 0 " S W k WELL GRADED SANDS OR GRAVELY SANDS. LITTLE OR NO FINES <br /> N <br /> SANDS LOW <br /> f/) SP r_S. POORLY GRADED SANDS OR GRAVELY SANDS, LITTLE OR NO FINES <br /> w (MARE THAN U2 OF SM SILTY SANDS. SAND-SILT MIXTURES <br /> rf=_- U s COARSE FRACTION ( <br /> NO. 4 SIEVE SIZE) <br /> Sc CLAYEY SANDS, SAND-CLAY MIXTURES <br /> W <br /> _ ; ; ; INORGANIC SILTS AND VERY FINE SANDS, ROCK FLOWER, SILTY OR CLAYEY <br /> ML i FINE SANDS OR CLAYEY SILTS WITH SLIGHT PLASTICITY <br /> `-J -> > SILTS & CLAYS <br /> O I INORGANIC CLAYS OF LOW TO MEDIUM PLASTICITY, GRAVELY CLAYS, <br /> L'i LLC50 CL SANDY CLAYS, SILTY CLAYS, LEAN CLAYS <br /> Q ;i;i' <br /> LLI OL ORGANIC SILTS AND ORGANIC SILTY CLAYS OF LOW PLASTICITY <br /> L El <br /> Q y INORGANIC SILTS. MICACEOUS OR DIATOMACECOUS FINE SANDY OR SILTY <br /> j ry MH SOILS. ELASTIC SILTS <br /> L7 N SILTS & CLAYS <br /> L1 z CH INORGANIC CLAYS OF HIGH PLASTICITY, FAT CLAYS <br /> LL>50 <br /> ORGANIC CLAYS OF MEDIUM TO HIGH PLASTICITY, ORGANIC SILTY CLAYS. <br /> L` g OH ��� ORGANIC SILTS <br /> =` HIGHLY ORGANIC SOILS Pt PEAT AND OTHER HIGHLY ORGANIC SOILS <br /> CLASSIFICATI❑N CHART <br /> ( UNIFIED SOIL CLASSIFICATION SYSTEM ) <br /> `_- RANGE OF- GRAIN SIZES <br /> CLASSIFICATION U.S. STANDARD GRAIN SIZE SANDS AND GRAVELS BLOWS/FGOT <br /> SIEVE SIZE IN MILLIMETERS <br /> VERY LOOSE 0 - 4 <br /> BOULDERS ABOVE 12• ABOVE 13' <br /> LOOSE 4 - 10 <br /> COBBLES 12, TO 3' 305 TO 76.2 MEDIUM DENSE f0 - 30 <br /> DENSE 30 - 50 <br /> GRAVEL 3• TO NO. 4 76.2 TO 4.76 VERY DENSE OVER 50 <br /> 1 COARSE 3' TO 1/4• 76.2 TO 191 <br /> _ f FINE 3/4' TO NO. 4 19.1 TO 4.76 RELATIVE DENSITY <br /> SAND NO. 4 TO NO. 200 4.760 TO 0.074 <br /> SILTS AND CLAYS BLOWS/FOOT <br /> II COARSE NO, 4 TO NO. 10 4.760 TO 2.000 <br /> MEDIUM NO. 10 TO NO. 40 2.000 TO 0 420 <br /> VERY SOFT 0 - 2 <br /> FINE NO. 40 TO NO. 200 0.420 TO 0.074 <br /> SOFT 2 - 4 <br /> MEDIUM STIFF 4 - B <br /> SILT & CLAY BELOW NO. 200 BELOW 0.074 <br /> r 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. (1-3/8 INCH I.D.) SPLIT SPOON (ASTM D-1586). <br /> :I PAGE OF <br />