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a <br /> + al v <br /> it <br /> METHOD OF SOIL CLASSIFICATION <br /> MAJOR DIVISIONS SYMBOLS TYPICAL NAMES <br /> it <br /> ci�w WELL GRADED GRAVELS OR GRAVEL-SAND MIXTURES, LITTLE OR NO FINES 3 <br /> GRAVELS <br /> J W GP POORLY GRADED GRAVELS OR GRAVEL-SAND MIXTURES LITTLE OR N13 FINES <br /> a <br /> =].v J 1 <br /> V),; (MORE Tww 1/2 OF GM SILrr GRAVELS. GRAVEL-SAND-SILT MIXTURES <br /> + A'iv COARSE FRACTION ) <br /> W d N0. 4 SIEVE SIZE) o Ij <br /> Z z GC o CLAYEY GRAVELS GRAVEL-SAND-CLAY MIXTURES <br /> it ¢ <br /> 0; SW WELL GRADED SANDS OR GRAVELY SANDS, LITTLE OR NO FINES <br /> b SANDS ;1 <br /> La <br /> C4,a SP i'`<;A' POORLY GRADED SANDS OR GRAVELY SANDS. LITTLE OR NO FINES <br /> tr!� _ :! <br /> <! <br /> OWE n." V2 OF i <br /> { U$ COARSE FRACTION < SM SILTY SANDS, SAND-SILT MIXTURES II <br /> { NO. 4 SIEVE,SIZE) _ <br /> f <br /> Sc CLAYEY SANDS. SAND-CLAY MIXTURES <br /> i <br /> INORGANIC SILTS AND VERY FINE SANDS.!RUCK FLOWER. SILTY OR CLAYEY <br /> V3. ML FINE SANDS OR CLAYEY SILTS WITH SLIGHT PLASTICITY <br /> X SILTS & CLAYS <br /> oz; INORGANIC CLAYS OF LOW TO MEDIUM PLASTICITY. GRAVELY CLAYS, <br /> i 1 w-1 LLCSO CL SANDY CLAYS, SILTY CLAYS, LEAN CLAYS! <br /> Z OL ORGANIC SILTS AND ORGANIC SILTY CLAYS OF LOW PLASTICITY <br /> } < s M� INORGANIC SILTS, MICACEOUS OR DIATOMACECOUS FINE SANDY OR SILTY <br /> cl�Lo SILTS & CLAYS SOILS, ELASTIC SILTS <br /> IN12RGANIC CLAYS OF HIGH PLASTICITY, FAT CLAYS <br /> CH� <br /> Z LL>5Q i <br /> Li L ORGANIC CLAYS OF MEDIUM TO HIGH PLASTICITY. ORGANIC SILTY CLAYS. <br /> g OH ORGANIC SILTS <br /> P HIGHLY ORGANIC SOILS Pt PEAT AND 13THER HIGHLY ORGANIC SOILS? - <br /> i; <br /> CLASSIFICATION CHART <br /> S ( UNIFIED SOIL CLASSIFICATION SYSTEM ) <br /> 8 <br /> RANGE OF GRAIN SIZES q <br /> CLASSIFICATION U.S. STANDARD I GRAIN SIZE SANDS HAND GRAVELS BLOWS/FI30T <br /> F SIEVE SIZE IN MILLIMETERS <br /> 1 VERY LOOSE 0 - 4 <br /> BOULDERS ABOVE 12' ABOVE 13' <br /> li LOUSE 4 - 10 <br /> COBBLES 12' TO 3' 305 TO 76.2 MEDIUM DENSE 10 - 30 <br /> II DENSE 30 - 50 <br /> GRAVEL 3' TO Na. 4 76.2 TO 4.76 VERY DENSE OVER 50 <br /> ;COARSE 3'JO I/4• 75.2 Ta 19.1 <br /> I <br /> FINE 3/4' TO NO. 4 19.1 TO 4.76 r RELATIVE DENSITY <br /> SAID NO. 4 TO NO. 200 4,760 TO 0.074 SILTS AND CLAYS BLOWS/FOOT <br /> COARSE NIL4 TO NO, 10 4.760 r0 2.000 I <br /> MEDIUM NO. 10 TO NO. 40 2.000 TO 0.420 VERY SOFT 0 - 2 1 <br /> FINE NO. 40 TO'NO. 200 0.420 TO 0.074 <br /> SOFT 2 - 4 <br /> MEDIUM srIFF 4 - 8 <br /> f SILT & CLAY BELOW NO 200 SELOV 0.074 <br /> I STIFF 8 - 16 <br /> VERY STIFF 16 - 32 <br /> y GRAIN SIZE CHAT HARD OVER 32 <br /> 4 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 <br /> PAGE OF <br />