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UNIFIED SOIL CLASSIFICATION SYSTEM MAJOR DIVISIONS USCS TYPICAL SYMBOL DESCRIPTIONS GW WELL-GRADED GRAVELS,GRAVEL-SAND CLEAN GRAVELS = MIXTURES WITH LITTLE OR NO FINES WITH LITTLE – GRAVELS OR NO FINES =— GF POORLY-GRADED GRAVELS,GRAVEL-SAND (More than half of MIXTURES WITH LITTLE OR NO FINES coarse fraction is larger thanGM SILTY GRAVELS, GRAVEL-SILT-SAND the #4 sieve) GRAVELS MIXTURES COARSE WITH OVER GRAINED 12% FINES GC CLAYEY GRAVELS,GRAVEL-SAND-CLAY SOILS MIXTURES (More than half - WELL-GRADED SANDS, SAND-GRAVEL of material SW MIXTURES WITH LITTLE OR NO FINES is larger than CLEAN SANDS _- the #200 sieve) WITH LITTLE SANDS OR NO FINES SP POORLY-GRADED SANDS, SAND-GRAVEL MIXTURES WITH LITTLE OR NO FINES (More than half of coarse fraction is smaller than SM SILTY SANDS,SAND-GRAVEL-SILT MIXTURES the #4 sieve) SANDS WITH OVER 12% FINES SC CLAYEY SANDS, SAND-GRAVEL-CLAY MIXTURES INORGANIC SILTS&VERY FINE SANDS, ML SILTY OR CLAYEY FINE SANDS, CLAYEY SILTS WITH SLIGHT PLASTICITY SILTS AND CLAYS INORGANIC CLAYS OF LOW TO MEDIUM CL PLASTICITY,GRAVELLY CLAYS, SANDY CLAYS, (Liquid limit less than 50) SILTY CLAYS, LEAN CLAYS FINE GRAINED OL ORGANIC SILTS&ORGANIC SILTY CLAYS SOILS OF LOW PLASTICITY (More than half INORGANIC SILTS, MICACEOUS OR of material MH DIATOMACEOUS FINE SAND OR SILT is smaller than the #200 sieve) SILTS AND CLAYS CH INORGANIC CLAYS OF HIGH PLASTICITY, FAT CLAYS (Liquid limit greater than 50) OH ORGANIC CLAYS&ORGANIC SILTS OF MEDIUM-TO-HIGH PLASTICITY LOAMS UNDER USDA SOIL CLASSIFICATION SYSTEM, SOIL OF APPROXIMATELY EQUAL SAND/SILT/CLAY UNIFIED SOIL CLASSIFICATION SYSTEM PLATE k4KLEI N FELDER MARCH LANE EXTENSION Q o Drafted By: DWA Project No.: 20-3712-08-E02 w Date: 12/9/98 File Number: STOCKTON, CALIFORNIA Y Copyright Kleinfelder,Inc. 1998