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%bwo .d UNIFIED SOIL CLASSIFICATION SYSTEM MAJOR DIVISIONS USCS TYPICAL SYMBOL DESCRIPTIONS 'I] GW WELL-GRADED GRAVELS,GRAVEL-SAND CLEAN GRAVELS :I MIXTURES WITH LITTLE OR NO FINES GRAVELS WITH LITTLE OR NO FINES GRAVELS,G (More than half of o C GP MIXTURES WPOORLY-GITHDLITTLE OR NOFINES VEL-SAND coarse fraction is larger than the#4 sieve) GM SILTY GRAVELS,GRAVEL-SILT-SAND GRAVELS MIXTURES COARSE WITH OVER GRAINED 12% FINES GC CLAYEY GRAVELS,GRAVEL—SAND—CLAY SOILS MIXTURES (More than half SW WELL-GRADED SANDS,SAND-GRAVEL of material CLEAN SANDS MIXTURES WITH LITRE OR NO FINES is larger than SANDS WITH LITTLE the#200 sieve) (More than half of OR NO FINESS.p POORLY-GRADED SANDS,SAND-GRAVEL coarse fraction MIXTURES WITH LITRE OR NO FINES is smaller than the#4 sieve) S'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 SILTS AND CLAYSINORGANIC CLAYS OF LOW TO MEDIUM CL 2F — 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 INORGANIC SILTS,MICACEOUS OR (More than half MH of material DIATOMACEOUS FINE SAND OR SILT is smaller than the#200 sieve) SILTS AND CLAYS CH INORGANIC CLAYS OF HIGH PLASTICITY, (Liquid limit greater than 50) FAT CLAYS OH ORGANIC CLAYS 8 ORGANIC SILTS OF MEDIUM-TO-HIGH PLASTICITY HIGHLY ORGANIC SOILS pT PEAT,HUMUS,SWAMP SOILS WITH HIGH ORGANIC CONTENT m J`. e 'a UNIFIED SOIL CLASSIFICATION SYSTEM PLATE K L E I N F E L D E R PROPOSED ASHTON PLACE SUBDIVISION o PETERS, CALIFORNIA N Drafted BY: GDG Project No.: 23197.G01 Date: 2/9/2006 File Number. ST02G145 co ht aeme .ft.2 a