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MAJOR DIVISIONS GROUP GROUP NAME <br /> SYMBOL <br /> GRAVEL CLEAN GW WELL-GRADED GRAVEL, <br /> COARSE MORE THAN GRAVEL (FINE TO COARSE GRAVEL <br /> GRAINED 50% OF --- - - --- <br /> SOILS COARSE GP POORLY-GRADED <br /> MORE THAN FRACTION . f GRAVEL <br /> 50% RETAINED ON GRAVEL ` GM (SILTY GRAVEL <br /> RETAINED NO.4 SIEVE WITH FINES <br /> ON NO.200 GC CLAYEY GRAVEL <br /> SIEVE SAND CLEAN SW WELL-GRADED SAND, <br /> MORE THAN SAND FINE TO COARSE SAND <br /> 50% OF Sp POORLY-GRADED SAND <br /> COARSE �_ --I <br /> - <br /> FRACTION SAND WITH SM (SILTY SAND <br /> PASSES N0.4 FINES SC CLAYEY SAND <br /> SIEVE <br /> SILT AND _ INORGANIC ML 1S_,_LT _ <br /> FINE CLAY r CL ----[CLAY <br /> GRAINED LIQUID LIMIT ` - I <br /> MOREOILS LESS THAN 50 [ ORGANICf OL (OLRAGIANIC SILT, ORGANIC <br /> 50% SILT AND INORGANIC I MM (SILT OF HIGH <br /> PASSES CLAY PLASTICITY, ELASTIC <br /> NO.200 LIQUID LIMIT <br /> r SIEVE 50 OR MORE -- SILT ILT <br /> CH CLAY OF HIGH <br /> PLASTICITY, FAT CLAY <br /> ORGANIC OH ORGANIC CLAY, <br /> ORGANIC SILT <br /> HIGHLY ORGANIC SOILS PT rPEAT <br /> Ref: Unified Soil Classification System; from American Society for Testing and Materials, 1985 <br />