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COARSE <br />GRAINED <br />SOILS <br />(More than half <br />of material <br />is larger than <br />the #200 sieve) <br />FINE <br />GRAINED <br />SOILS <br />(More than half <br />of material <br />is smaller than <br />the #200 sieve) <br />• <br />UNIFIED SOIL CLASSIFICATION SYSTEM <br />USCS TYPICAL. <br />MAJOR DIVISIONS SYMBOL DESCRIPTIONS <br />GRAVELS <br />(More than half of <br />coarse fraction <br />is larger than <br />the 44 sieve) <br />SANDS <br />(More than half of <br />coarse fraction <br />is smaller than <br />the #4 sieve) <br />CLEAN GRAVELS <br />WITH LITTLE <br />OR NO FINES <br />GRAVELS <br />WITH OVER <br />12% FINES <br />CLEAN SANDS <br />WITH LITTLE <br />OR NO FINES <br />SANDS WITH <br />OVER 12% FINE: <br />SILTS AND CLAYS <br />(Liquid limit less than 50) <br />SILTS AND CLAYS <br />(Liquid limit greater than 50) <br />HIGHLY ORGANIC SOILS <br />0 <br />rn <br />GW <br />WELL-GRADEMIXTURES <br />WIDTH LITTLE OR NO FINESND <br />° O <br />GP <br />POORLY -GRADED GRAVELS, GRAVEL -SAND <br />o <br />MIXTURES WITH LITTLE OR NO FINES <br />O <br />° <br />GM <br />SILTY GRAVELS, GRAVEL -SILT -SAND <br />MIXTURES <br />�C <br />CLAYEY GRAVELS, GRAVEL -SAND -CLAY <br />MIXTURES <br />SW <br />SANDS, SAND -GRAVEL <br />MIXTURES WITH LITTLE OR NO FINES <br />MIXTURES <br />SP <br />POORLY -GRADED SANDS, SAND -GRAVEL <br />MIXTURES WITH LITTLE OR NO FINES <br />SM <br />SILTY SANDS, SAND -GRAVEL -SILT MIXTURES <br />CLAYEY SANDS, SAND -GRAVEL -CLAY MIXTURES <br />INORGANIC SILTS & VERY FINE SANDS, <br />M L <br />SILTY OR CLAYEY FINE SANDS, <br />CLAYEY SILTS WITH SLIGHT PLASTICITY <br />INORGANIC CLAYS OF LOW TO MEDIUM <br />CL <br />PLASTICITY, GRAVELLY CLAYS, SANDY CLAYS, <br />SILTY CLAYS, LEAN CLAYS <br />OIL <br />ORGANIC SILTS & ORGANIC SILTY CLAYS <br />OF LOW PLASTICITY <br />M H <br />INORGANIC SILTS, MICACEOUS OR <br />SILT <br />DIATOMACEOUS FINE SAND OR <br />CH <br />INORGANIC CLAYS OF HIGH PLASTICITY, <br />FAT CLAYS <br />OH <br />ORGANIC CLAYS & ORGANIC SILTS <br />OF MEDIUM -TO -HIGH PLASTICITY <br />u P r <br />PEAT, HUMUS, SWAMP SOILS WITH HIGH <br />ORGANIC CONTENT <br />a UNIFIED SOIL CLASSIFICATION SYSTEM <br />K L E i N F E L D E i� SAN JOAQUIN COUNTY MOSQUITO & VECTOR <br />CONTROL DISTRICT <br />LODI, CALIFORNIA <br />f r�'te l F•y' GLr Praier. �;.i T; <br />u.ypy,[gnl ,•?inlaltlei 4ipYg1tl3` ._. <br />PLATE <br />A-1 <br />