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82 / Chapter 4 .' GRAPHIC LETTER TYPICAL DESCRIPTIONS MAJOR DIVISIONS SYMBOL SYMBOL 01'0 0, f WELL-GRADED GRAVELS.GRAVEL - 00 8 • ! GW SAND MIXTURES.LITTLE OR NO !6 , i FINES GRAVEL • ■ AND CLEAN GRAVELS ■ GRAVELLY ....... SOILS (LITTLE OR NO POORLY-GRADED GRAVELS, Y;.•+:+:�� GP GRAVEL-SAND MIXTURES.LITTLE FINES) ••�•••••� OR NO FINES COARSE •�• GRAINED SOILS SILTY GRAVELS.GR A V E D.SANO- GM SILT MIXTURES GRAVELS WITH FINES MORE THAN 50% OF COARSE FRAC- (APPR£CiABLE TION RETAINED AMOUNT OF FINES) CLAYEY GRAVELS.GRAVEL-SANO- ON NO.a SIEVE GC CLAY MIXTURES 'I+°•�• WELL-GRADED SANDS.GRAVELLY Sw SANDS,LITTLE OR NO FINES CLEAN SAND SAND •+•0 0 AND ILITTLE OR NO o SANDY FINESI '''''!=: '''` POORLY-GRADED SANDS,GRAVEL- SOILS _ - Sp LY SANDS.LITTLE OR NO FINES MORE THAN 50% OF MATERIAL 15 LARGER THAN NO. 209 SIEVE SIZE SILTY SANDS,SAND-SILT - SM MIXTURES SANDS WITH FINES MORE THAN 50% OF COARSE FRAC- iAPPRECIABLE TION PASSING AMOUNT OF FINES) NO.4 SIEVE CLAYEY SANDS,SAND-CLAY SC MIXTURES INORGANIC SILTS AND VERY F;%E 1 ML SANDS,ROCK FLOUR,SILTY OR CLAYEY FINE SANDS OR CLAYEY SILTS WITH SLIGHT PLASTICITY INORGANIC CLAYS OF LOW TO FINE SILTS LIOUID LIMIT >� MEDIUM PLASTICITY,GRAVELLY GRAINED AND CL CLAYS.SANDY CLAYS,SILTY SOILS CLAYS LESS THAN 50 CLAYS,LEAN CLAYS 1 11 i 11 i l l ORGANIC SILTS AND ORGANIC 1111(I I I OL SILTY CLAYS OF LOW PLASTICITY 1111111j1 IEf�lll�l INORGANIC SILTS.MICACEOUS OR MH DIATOMACEOUS FINE SAND OR SILTY SOILS MORE THAN 50'': SILTS INORGANIC CLAYS OF HIGH OF MATERIAL IS AND LIQUID LIMIT CH PLASTICITY,FAT CLAYS SMALLER THAN NO. CLAYS GREATER THAN 50 200 SIEVE SIZE ORGANIC CLAYS OF MEDIUM TO OH HIGH PLASTICITY,ORGANIC SILTS PEAT,HUMUS,SWAMP SOILS WITH HIGHLY ORGANIC SOILS PT HIGH ORGANIC CONTENTS USCI). Note that dual symbols are used to indicate borderline soils Figure 414 Unified Soil Classification System ( (e-g., SM-SC indicates a mixture of silty sand and clayey sand). (based on Casagrande, 1948)