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SOIL CLASSIFICATION CHART <br />SYMBOLS TYPICAL <br />MAJOR DIVISIONS <br />GRAPH LETTER DESCRIPTIONS <br />...... <br />CLEAN ...2...WELL-GRADED GRAVELS, GRAVEL - <br />GRAVEL GW SAND MIXTURES, LITTLE OR NO <br />GRAVELS ......FINES <br />AND <br />GRAVELLY 0-a b.0-a b <br />Solls D ° 6.POORLY-GRADED GRAVELS,(LITTLE OR NO FINES) i, 6<3 GRAVEL -SAND MIXTURES, LITTLE <br />000000 OR NO FINES <br />COARSE o-Or_).6.Dtj <br />GRAINED GRAVELS WITH it<SiU GM SILTY GRAVELS, GRAVEL - SAND - <br />SOILS MORE THAN 50%FINES SILT MIXTURES <br />OF COARSE 000000 <br />FRACTION <br />RETAINED ON NO. <br />4 SIEVE (APPRECIABLE CLAYEY GRAVELS, GRAVEL - SAND - <br />CLEAN SANDS <br />(LITTLE OR NO FINES) <br />SILTS <br />FINE AND <br />GRAINED CLAYS <br />SOILS <br />SIA <br />% <br />SP <br />% <br />SM <br />SC <br />ML <br />"Nuum//lill,/ ... <br />AMOUNT OF FINES) 'CLAY MIXTURES <br />MORE THAN 50% <br />OF MATERIAL IS <br />LARGER THAN <br />NO. 200 SIEVE <br />SIZE <br />SAND <br />AND <br />SANDY <br />SOILS <br />WELL-GRADED SANDS, GRAVELLY <br />SANDS, LITTLE OR NO FINES <br />POORLY-GRADED SANDS, <br />GRAVELLY SAND, LITTLE OR NO <br />FINES <br />SANDS WITH i SILTY SANDS. SAND - SILT <br />MORE THAN 50%FINES 1 MIXTURES <br />OF COARSE <br />FRACTION <br />PASSING ON NO. <br />4 SIEVE (APPRECIABLE CLAYEY SANDS, SAND - CLAY <br />AMOUNT OF FINES)MIXTURES <br />INORGANIC SILTS AND VERY FINE <br />SANDS, ROCK FLOUR, SILTY OR <br />CLAYEY FINE SANDS OR CLAYEY <br />SILTS WITH SLIGHT PLASTICITY <br />INORGANIC CLAYS OF LOW TO <br />LIQUID LIMIT MEDIUM PLASTICITY, GRAVELLY <br />LESS THAN 50 -////A UL CLAYS, SANDY CLAYS, SILTY CLAYS, <br />LEAN CLAYS <br />MORE THAN 50% <br />OF MATERIAL IS <br />SMALLER THAN <br />NO. 200 SIEVE <br />SIZE <br />SILTS <br />AND <br />CLAYS <br />LIQUID LIMIT <br />GREATER THAN 50 <br />HIGHLY ORGANIC SOILS <br />0L <br />MH <br />CH <br />0H <br />4 2 4 0 4 0 4 i PT <br />04 *,4 04 04 <br />lilli'1'1 lilli lilli ORGANIC SILTS AND ORGANIC <br />SILTY CLAYS OF LOW PLASTICITY <br />INORGANIC SILTS, MICACEOUS OR <br />DIATOMACEOUS FINE SAND OR <br />SILTY SOILS <br />INORGANIC CLAYS OF HIGH <br />PLASTICITY <br />ORGANIC CLAYS OF MEDIUM TO <br />HIGH PLASTICITY, ORGANIC SILTS <br />PEAT, HUMUS, SWAMP SOILS WITH <br />HIGH ORGANIC CONTENTS <br />NOTE: DUAL SYMBOLS ARE USED TO INDICATE BORDERLINE SOIL CLASSIFICATIONS