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1 ` C) i MAJOR DIVISIONS �RAPNIC LETTER TYPICAL DESCRIPTIONS SYMBOL SYMBOL P� I WELL-GRADED GRAVELS.GRAVEL- do 44 GW SAND MIXTURES,LITTLE OR NO GRAVEL ♦�141 FINESAND 6 GRAVELLY CLEAN GRAVELS I Is 0R SOILS (LITTLE OR NO �••�'�•'• POORLY-GRADED GRAVELS, FINES) �,�;„` GP GRAVEL-SAND MIXTURES,LITTLE;,, OR NO FINES COARSE •��;;�;;; GRAINED SOILS SILTY GRAVELS,GRAVELSANO• GRAVELS WITH FINES GM SILT MIXTURES MORE THAN 60% OF COARSE FRAC- (APPRECIABLE TION RETAINED AMOUNT OF FINEST ONN .4 SIEVE CLAYEY GRAVELS,GRAVELSAND= GC CLAY MIXTURES WELL-GRADED SANDS,GRAVELLY CLEAN SAND SW SANDS,LITTLE OR NO FINES SAND n ��•O AND (LITTLE OR NO o SANDY FINEST SOILS POORLY-GRADED SANDS,GRAVEL- MORE THAN 6096 ? :? ., .: S? LY SANDS,LITTLE OR NO FINES OF MATERIAL IS Ik LARGER THAN NO. ':r:`:"`:':::'.;:•::: 200 SIEVE SIZE 4 SILTY SANDS.SAND-SILT SANDS WITH FINES SM MIXTURES MORE THAN 50% OF COARSE FRAC, (APPRECIABLE ' TION PASSING AMOUNT OF FINES) NO.4 SIEV E CLAYEY SANDS,SAND-CLAY Sc MIXTURES I= INORGANIC SILTS AND VERY FINE ML SANDS,ROCK FLOUR,SILTY OR CLAYEY FINE SANDS OR CLAYEY.' SILTS WITH SLIGHT PLASTICITY FINE SILTS INORGANIC CLAYS OF LOW TO GRAINED AND LIQUID LIMIT CL MEDIUM PLASTICITY,GRAVELLY SOILS CLAYS LESS THAN 50 CLAYS,SANDY CLAYS,SILTY CLAYS,LEAN CLAYS I I I I t ORGANIC SILTS AND ORGANIC I I I I E OL SILTY CLAYS OF LOW PLASTICITY IIIIIIII( I�IIIIIII INORGANICSILTS,MICACEOUS OR' MH DIATOMACEOUS FINE SAND OR y $1 LTY SOILS MORE THAN 50% SILTS OF MATERIAL IS AND LIQUID LIMIT CH INORGANIC CLAYS OF HIGH SMALLER THAN NO. GREATER THAN 50 PLASTICITY,FAT CLAYS 200_SIEVE SIZE CLAYS ORGANIC CLAYS OF MEDIUM TO r OH HIGH 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 UNIFIED SOIL CLASSI ICATION SYSTEM OGER FOOTT ASSOCIATES, INC. PLATE 3 i