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MAJOR DIVISIONS GROUP GROUP NAME <br /> SYMBOL <br /> GW WELL-GRADED GRAVEL, <br /> GRAVEL CLEAN <br /> COARSE MORE THAN GRAVEL FINE TO COARSE GRAVEL <br /> GRAINED 50% OF G POORLY-GRADED <br /> SOILS COARSE (GRAVEL <br /> MORE THAN FRACTION <br /> 500/0 RETAINED ON j GRAVEL GM SILTY GRAVEL <br /> RETAINED NO.4 SIEVE WITH FINES <br /> �- GC CLAYEY GRAVEL <br /> ON N 0.200 ----- - - - - <br /> SIEVE SAND CLEAN SW WELL-GRADED SAND, <br /> MORE THAN <br /> SAND FINE TO COARSE SA <br /> ND <br /> 50% OF SP (POORLY-GRADED SAND <br /> COARSE <br /> FRACTION [SANDWITH ( SM SILTY SANDPASSES NO.4 ES (-SC [ELA�yAND <br /> SIEVE <br /> SILT AND INORGANIC ML SILT <br /> FINE CLAY ( CL CLAY <br /> GRAINED LIQUID LIMIT - <br /> SOILS LESS THAN 50 ORGANICF OL �RGPNIC SILT, ORGANIC <br /> MORE THAN LAY <br /> 50% SILT AND INORGANIC MH SILT OF HIGH <br /> PASSES CLAY PLASTICITY, ELASTIC <br /> NO.200 LIQUID LIMIT SILT <br /> SIEVE 50 OR MORE <br /> CH CLAY OF HIGH <br /> PLASTICITY, FAT CLAY <br /> ORGANIC OH ORGANIC CLAY, <br /> ORGANIC SILT <br /> HIGHLY ORGANIC SOILS PT PEAT <br /> Ref: Unified Soil Classification System; from American Society for Testing and Materials, 1985 <br />