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SOIL CLASSIFICATION CHART <br />NOTE: DUAL SYMBOLS ARE USED TO INDICATE BORDERLINE SOIL CLASSIFICATIONS <br />Page 3 of 3 <br />SYMBOLS <br />TYPICAL <br />MAJOR DIVISIONS <br />DESCRIPTIONS <br />GRAPH <br />LETTER <br />'' <br />WELL -GRADED GRAVELS, GRAVEL - <br />CLEAN <br />GW <br />SAND MIXTURES, LITTLE OR NO <br />GRAVEL <br />GRAVELS <br />FINES <br />AND <br />Ij ° Q° o J <br />POORLY -GRADED GRAVELS, <br />GRAVELLY <br />SOILS <br />(LITTLE OR NO FINES) <br />o p�o p <br />GP <br />GRAVEL - SAND MIXTURES, LITTLE <br />0,0 Q <br />OR NO FINES <br />COARSE <br />GRAINED <br />GRAVELS WITH <br />°� °0 <br />° <br />D <br />GM <br />SILTY GRAVELS, GRAVEL -SAND - <br />SOILS <br />MORE THAN 50% <br />FINES <br />o <br />SILT MIXTURES <br />OF COARSE <br />° <br />FRACTION <br />RETAINED ON NO. <br />4 SIEVE <br />(APPRECIABLE <br />GC <br />G <br />CLAYEY GRAVELS, GRAVEL -SAND - <br />AMOUNT OF FINES) <br />CLAY MIXTURES <br />SW <br />WELL -GRADED SANDS, GRAVELLY <br />SAND <br />CLEAN SANDS <br />SANDS, LITTLE OR NO FINES <br />MORE THAN 50% <br />AND <br />OF MATERIAL IS <br />POORLY -GRADED SANDS, <br />LARGER THAN <br />SANDY <br />NO. 200 SIEVE <br />SOILS <br />LITTLE OR NO FINES) <br />(LITTLE <br />.. <br />Sp <br />GRAVELLY SAND, LITTLE OR NO <br />FINES <br />SANDS WITH <br />SM <br />SILTY SANDS, SAND - SILT <br />MORE THAN 50% <br />FINES <br />MIXTURES <br />OF COARSE <br />FRACTION <br />PASSING ON NO. <br />4 SIEVE <br />(APPRECIABLESC <br />CLAYEY SANDS, SAND - CLAY <br />AMOUNT OF FINES) <br />v7 <br />MIXTURES <br />INORGANIC SILTS AND VERY FINE <br />ML <br />SANDS, ROCK FLOUR, SILTY OR <br />CLAYEY FINE SANDS OR CLAYEY <br />SILTS WITH SLIGHT PLASTICITY <br />SILTS <br />INORGANIC CLAYS OF LOW TO <br />FINE <br />AND LIQUID LIMIT <br />CL <br />MEDIUM PLASTICITY, LLY <br />CLAYS, ANDY CLAYS, SILTY <br />GRAINED <br />LESS THAN 50 <br />CLAYS <br />CLAYS, LEAN CLAYS <br />SOILS <br />OL <br />ORGANIC SILTS AND ORGANIC <br />SILTY CLAYS OF LOW PLASTICITY <br />MORE THAN 50% <br />INORGANIC SILTS, MICACEOUS OR <br />OF MATERIAL IS <br />III <br />MH <br />DIATOMACEOUS FINE SAND OR <br />SMALLER THAN <br />SILTY SOILS <br />NO. 200 SIEVE <br />CH <br />RGANIC OF HIGH <br />SIZE <br />SILTS <br />LIQUID LIMIT <br />AND GREATER THAN 50 <br />PLASTICITY <br />CLAYS <br />CLAYS <br />OH <br />ORGANIC CLAYS OF MEDIUM TO <br />HIGH PLASTICITY, ORGANIC SILTS <br />PT <br />PEAT, HUMUS, SWAMP SOILS WITH <br />HIGHLY ORGANIC SOILS <br />HIGH ORGANIC CONTENTS <br />NOTE: DUAL SYMBOLS ARE USED TO INDICATE BORDERLINE SOIL CLASSIFICATIONS <br />Page 3 of 3 <br />