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WATER WORK <br /> rA <br /> METHOD OF SOIL CLASSIFICATION <br /> MAJOR DIVISI❑NS SYMBOLS TYPICAL NAMES <br /> GIA! WELL GRADED GRAVELS OR GRAVEL-SAND MIXTURES LITTLE OR NO FINES <br /> GRAVELS <br /> � y <br /> GP POORLY GRADED GRAVELS OR GRAVEL-SAND MIXTURES. LITTLE IR NO FINES <br /> 0 <br /> GM <br /> aoiE THAN v2 OF SILTY GRAVELS, GRAVEL-SAND-SILT MIXTURES <br /> A N COARSE FRACTION ) <br /> �..r W NO. 4 SIEVE S1ZE7 0 <br /> 4 A GC C CLAYEY GRAVELS GRAVEL-SAND-CLAY MIXTURES <br /> J <br /> Li S w = WELL GRADED SANDS OR GRAVELY SANDS, LITTLE OR NO FINES <br /> '-' W SANDS <br /> SP N. POORLY GRADED SANDS OR GRAVELY SANDS, LITTLE OR NO FINES <br /> Q <br /> C3 O COARSE FRACTION�TMA1/2 OF <br /> (--I SM SILTY SANDS, SAND-SILT MIXTURES <br /> v M <br /> S N0. 4 SIEVE SI7E7 <br /> Sc CLAYEY SANDS, SAND-CLAY MIXTURES <br /> INORGANIC SILTS AND VERY FINE SANDS RUCK FLOVER, SILTY OR CLAYEY <br /> u J " ML Iii FINE SANDS OR CLAYEY SILTS WITH SLIGHT PLASTICITY <br /> SILTS & CLAYS <br /> p a INORGANIC CLAYS OF LOW TO MEDIUM PLASTICITY, GRAVELY CLAYS, <br /> (n 8 CL SANDY CLAYS, SILTY CLAYS, LEAN CLAYS <br /> w LL<50 <br /> A ❑L i i'i ORGANIC SILTS AND ORGANIC SILTY CLAYS OF LOW PLASTICITY <br /> z <br /> INORGANIC SILTS, MICACEDUS OR DIATOMACECOUS FINE SANDY OR SILTY <br /> MH SOILS, ELASTIC SILTS <br /> a SILTS & CLAYS <br /> r1 (iI CH INORGANIC CLAYS OF HIGH PLASTICITY, FAT CLAYS <br /> z LL>50 <br /> L� /ii ORGANIC CLAYS OF MEDIUM TO HIGH PLASTICITY, ORGANIC SILTY CLAYS <br /> OH ��� ORGANIC SILTS <br /> V <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 /> CLASSIFICATION US. STANDARD GRAIN SIZE SANDS AND GRAVELS BLOWS/FOOT <br /> SIEVE SIZE IN MILLIMETERS 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 10 - 30 <br /> DENSE 30 - 50 <br /> GRAVEL 3' TO NO. 4 76.2 TO 4.76 VERY DENSE OVER 50 <br /> COARSE 3' TO 1/4' 762 TO l91 <br /> `r FINE 3/4' TO NO. 4 19.1 TO 4.76 RELATIVE DENSITY <br /> SAND NO. 4 TO NR P00 4.760 TO 0.074 SILTS AND CLAYS BLOWS/FOOT <br /> a► COARSE NO. 4 TO NO. 10 4.760 TO 2.000 <br /> MEDIUM NO. 10 TO NO. 40 2.000 TO 0.420 <br /> FINE NO. 40 TO NO, 200 0.420 TO 0.074 VERY SOFT 0 - 2 <br /> SOFT 2 - 4 <br /> SILT & CLAY BELOW NO, 200 BELOW 0.074 MEDIUM STIFF 4 - 8 <br /> STIFF 8 - 16 <br /> GRAIN SIZE CHART VERY STIFF 16 - 32 <br /> i HARD OVER 32 <br /> u <br /> + NUMBER OF BLOWS OF 140 POUND HAMMER FALLING 30 INCHES TO DRIVE A CONSISTENCY <br /> 2 INCH O.D. U-3/8 INCH I.D.) SPLIT SPOON (ASTM D-1586). <br /> PAGE OF <br />