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UNIFIED SOIL CLASSIFICATION SYSTEM r MAJOR DIVISIONS USCS TYPICAL SYMBOL DESCRIPTIONS GW WELL-GRADED GRAVELS,GRAVEL-SAND CLEAN GRAVELS :I MIXTURES WITH LITTLE OR NO FINES GRAVELS WITH LITTLE OR NO FINES (More than half of GP POORLY-GRADED GRAVELS,GRAVEL-SAND o MIXTURES WITH LITTLE OR NO FINES coarse fraction O is larger than the#4 sieve) o GM SILTY GRAVELS,GRAVEL-SILT-SAND GRAVELS MIXTURES COARSE WITH OVER GRAINED 12% FINES CLAYEY GRAVELS,GRAVEL-SAND-CLAY SOILS po GC MIXTURES (More than half SW WELL-GRADED SANDS,SAND-GRAVEL s of material CLEAN SANDS MIXTURES WITH LITTLE OR NO FINES is larger than SANDS WITH LITTLE the#200 sieve) (More than half of OR NO FINES $p POORLY-GRADED SANDS,SAND-GRAVEL coarse fraction is smaller than MIXTURES WITH LITTLE OR NO FINES the#4 sieve) $M SILTY SANDS,SAND-GRAVEL-SILT MIXTURES 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 r. SILTS AND CLAYSINORGANIC CLAYS OF LOW TO M CL PLASTICITY,GRAVELLY CLAYS.SANDY CLAYS, (Liquid limit less than 50) SILTY CLAYS,LEAN CLAYS FINE — GRAINED ORGANIC SILTS&ORGANIC SILTY CLAYS SOILS — OL OF LOW PLASTICITY (More than half MH INORGANIC SILTS,MICACEOUS of material DIATOMACEOUS FINE SAND OR SILT 1 is smaller than the#200 sieve) SILTS AND CLAYS � CH FAT CLAYS OF HIGH PLASTICITY, (Liquid limit greater than 50) FAT CLAYS OH ORGANIC CLAYS&ORGANIC SILTS OF MEDIUM-TO-HIGH PLASTICITY h. HIGHLY ORGANIC SOILSpT PEAT,HUMUS,SWAMP SOILS WITH HIGH dt ORGANIC CONTENT 'a UNIFIED SOIL CLASSIFICATION SYSTEM PLATE �� K L E I N F E L D E R GOODLAND LANDSCAPE CONSTRUCTION, INC. y 21080 MOUNTAIN HOUSE PARKWAY SAN JOAQUIN COUNTY, CALIFORNIA 4 Drafted By: G.GOMEZ Project No.: 86892.G01 Date: 10/4/2007 File Number: ST07GI47 C P"M KIOIWNa ,i,c.a 7 r