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rl SOIL CLASSIFICATION CHART • MAJOR DIVISIONS SYMBOLS TYPICAL GRAPH LETTER DESCRIPTIONS 0 CLEAN WELL-GRADED GRAVELS,GRAVEL- GRAVEL GRAVELS OOo 4 GW SAND MIXTURES,LITTLE OR NO FINES AND Q 0 °� GRAVELLY o`• -'. POORLY-GRADED GRAVELS, GRAVEL SOILS (LITTLE OR NO FINES) �•� GP -SAND MIXTURES,LITTLE OR NO FINES COARSE GRAINED GRAVELS WITH ' ' SILTY GRAVELS,GRAVEL-SAND- SOILS MORE THAN 50% FINES GM SILT MIXTURES OF COARSE FRACTION RETAINED ON NO 4SIEVE (APPRECIABLE AMOUNT GC CLAYEY GRAVELS, GRAVEL-SAND - OF FINES) CLAY MIXTURES CLEAN SANDS SW SANDS,GRAVELLY SAND SANDS,LITTLE OR NO FINES MORE THAN 50% AND OF MATERIAL IS SANDY LARGER THAN NO 200 SIEVE SIZE SOILS (LITTLE OR NO FINES) SP SAND LLITTLE OR NOF NES DED SANDS,GRAVELLY • SANDS WITH SM SILTY SANDS,SAND SILT MIXTURES MORE THAN 50% FINES OF COARSE FRACTION PASSING ON NO 4 SIEVE (APPRECIABLE AMOUNT SC CLAYEY SANDS,SAND-CLAY OF FIN ES) MIXTURES INORGANIC SILTS AND VERY FINE ML SANDS,ROCK FLOUR,SILTY OR CLAYEY FINE SANDS OR CLAYEY SILTS WITH SLIGHT PLASTICITY SILTS INORGANIC CLAYS OF LOW TO FINELIQUIDLIMIT MEDIUM PLASTICITY,GRAVELLY GRAINED AND LESS THAN 50 C+L CLAYS,SANDY CLAYS,SILTY CLAYS CLAYS LEAN CLAYS SOILS — — �^_ OL ORGANIC SILTS AND ORGANIC SILTY CLAYS OF LOW PLASTICITY MORE THAN 50% INORGANIC SILTS,MICACEOUS OR OF MATERIAL IS MH DIATOMACEOUS FINE SAND OR SILTY SMALLER THAN SOILS NO 200 SIEVE slzE SILTS LIQUID LIMIT INORGANIC CLAYS OF HIGH AND GREATER THAN 50 CH PLASTICITY CLAYS ORGANIC CLAYS OF MEDIUM TO HIGH OH PLASTICITY ORGANIC SILTS PEAT,HUMUS,SWAMP SOILS WITH HIGHLY ORGANIC SOILS PT HIGH ORGANIC CONTENTS NOTE DUAL SYMBOLS ARE USED TO INDICATE BORDERLINE SOIL CLASSIFICATIONS