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k 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 OR = - GRAVELS NO FINES =— G P POORLY-GRADED GRAVELS, GRAVEL SAND MIXTURES WITH LI7TLE OR NO FINES MORE THAN HALF COARSE FRACTION _ GM SILTY GRAVELS, GRAVEL-SILT-SAND IS LARGER THAN GRAVELS MIXTURES COARSETHE#4 SIEVE I WITH OVER GRAINED 12%FINES GC CLAYEY GRAVELS, GRAVEL-SAND-CLAY SOILS = MIXTURES (MORE THAN HALF OF MATERIAL IS == SW WELL-GRADED SANDS, SAND-GRAVEL LARGER THAN CLEAN SANDS - MIXTURES WITH LITTLE OR NO FINES THE#200 SIEVE) WITH LITTLE OR SANDS NO FINES S P POORLY-GRADED SANDS, SAND-GRAVEL MIXTURES WITH LITTLE OR NO FINES f MORE THAN IIA LF _ S M COARSE FRACTION II_ SILTY SANDS, SAND-GRAVEL-SILT MIXTURES IS SMALLER THAN SANDS WITH THE#4 SIEVE OVER 12%FINESsc i ' CLAYEY SANDS, SAND-GRAVEL-CLAY MIXTURES i i M L INORGANIC SILTS& VERY FINE SANDS, SILTY OR CLAYEY FINE SANDS, SILTS AND CLAYS CLAYEY SILTS WITH SLIGHT PLASTICITY '-i:'i� INORGANIC CLAYS OF LOW TO MEDT UM j L PLASTICITY, GRAVELLY CLAYS, SANDY CLAYS. FINE LIQUID LIMITLESS TITAN 50 I ' SILTY CLAYS LEAN CLAYS GRAINED I 1 I O L ORGANIC SILTS& ORGANIC SILTY CLAYS l i l OF L 0 W PLASTICITY I (MORE THAN HALF OF MATERIAL IS TVI H INORGANIC SILTS, MICACEOUS OR SMALLER THAN DIATOMACEOUS FINE SAND OR SILT THE#200 SIEVE) SILTS AND CLAYS 01- CH INORGANIC CLAYS OF HIGH PLASTICITY, FAT CLAYS LIQUID LIMIT GREATER THAN 50 OH ORGANIC CLAYS& ORGANIC SILTS OF MEDIUM-TO-HIGH PLASTICITY HIGHLY ORGANIC SOILS L, PT PEAT, HUMUS, SWAMP SOILS WITH HIGH ORGANIC CONTENTS SOIL CLASSIFICATION SYSTEM PLATE Ilk" K L E I N F E L D E R TEVELDEDAIRY Drafted By: JNl'St Project No.: 204370-01.G01.GOi 27815 E. DODDS ROAD A-2SAN JOAQUIN COUNTY CA Date: 8131199 File Number: 20-4370-01.G01 Coppiglu Kleinrfelder,Gtr. 1999 1