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UNIFIED SOIL CLASSIFICATION SYSTEM MAJOR DIVISIONS USCS TYPICAL SYMBOL DESCRIPTIONS WELL - GRADED GRAVELS , GRAVEL - SAND _ CLEAN GRAVELS _ GW MIXTURES WITH LITTLE OR NO FINES WITH LITTLE OR GRAVELS NO FINES GP POORLY - GRADED GRAVELS , GRAVEL -SAND r MIXTURES WITH LITTLE OR NO FINES MORE THAN HALF SILTY GRAVELS , GRAVEL - SILT- SAND -- COARSE FRACTION GRAVELS GM MIXTURES IS LARGER THAN WITH OVER COARSE THE #4 SIEVE GRAINED 12% FINES GC CLAYEY GRAVELS , GRAVEL - SANG -CLAY SOILS V MIXTURES (MORE THAN HALF OF MATERIAL IS _ WELL - GRADED SANDS , SAND - GRAVEL LARGER THAN CLEAN SANDS _ _ SW MIXTURES WITH LITTLE OR NO FINES _ THE #200 SIEVE ) WITH LITTLE OR SANDS NO FINES S n POORLY- GRADED SANDS , SAND - GRAVEL - J J r MIXTURES WITH LITTLE OR NO FINES MORE THAN HALF COARSE FRACTION SM SILTY SANDS , SAND - GRAVEL - SILT MIXTURES _ IS SMALLER THAN SANDS WITH THE #4 SIEVE OVER 120% FINES - SC CLAYEY SANDS , SAND- GRAVEL - SILT MIXTURES INORGANIC SILTS & VERY FINE SANDS , M L SILTY OR CLAYEY FINE SANDS , CLAYEY SILTS WITH SLIGHT PLASTICITY SILTS AND CLAYS INORGANIC CLAYS OF LOW TO MEDIUM - ICL PLASTICITY , GRAVELLY CLAYS, SANDY CLAYS , SILTY CLAYS , LEAN CLAYS _ FINE LIQUID LIMIT LESS THAN 50 GRAINEDI I I ORGANIC SILTS & ORGANIC SILTY CLAYS SOILS OL OF LOW PLASTICITY - (MORE THAN HALF INORGANIC SILTS, MICACEOUS OR OF MATERIAL 15 MH DIATOMACEOUS FINE SAND OR SILT - � SMALLER THAN THE #200 SIEVE ) SILTS AND CLAYS _ GH INORGANIC CLAYS OF HIGH PLASTICITY , FAT CLAYS - LIQUID LIMIT GREATER THAN 50 ORGANIC CLAYS & ORGANIC SILTS OH OF MEDIUM -TO-HIGH PLASTICITY I - I HIGHLY ORGANIC SOILS : PT PEAT , HUMUS , SWAMP SOILS H1GH ORGANIC CONTENTS a SOIL CLASSIFICATION SYSTEM PLATE KLEIN F E L D E R SAN JOAQUIN COUNTY GARAGE 130 NORTH HUNTER STREET A-1 PROJECT NO. 23-480020.000 STOCKTON , CALIFORNIA I: . Copyright Kleinfelder , Inc . 1994