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UNIFIED SOIL 'CLASSIFICATION SYSTEM. ... <br /> • MAJOR DIVISIONS GROUP ,GROUP NAME <br /> ] SYMBOL <br /> GRAVEL . . t CLEAN GW WELL-GRADED GRAVEL,FINE TO COARSE GRAVEL <br /> COARSE- MORE THAN 50%OF GRAVEL GP POORLY-GRADED GRAVEL <br /> GRAINED COARSE FRACTION GRAVEL WITH GM SILTY GRAVEL <br /> SOILS RETAINED ON NO.4 SIEVE <br /> FINES GC CLAYEY GRAVEL <br /> SAND CLEAN SW WELL-GRADED SAND,FINE TO COARSE SAND <br /> MORE THAN 50% MORE THAN 50%OF SAND SP POORLY-GRADED SAND <br /> RETAINED ON THE COARSE FRACTION SAND WITH SM SILTY SAND <br /> NO.200 SIEVE PASSING NO.4 SIEVE <br /> FINES SC CLAYEY SAND <br /> FINE- SILT AND CLAY INORGANIC ML SILT <br /> GRAINEDCL CLAY <br /> LIQUID LIMIT <br /> SOILS LESS THAN 50% ORGANIC OL ORGANIC SILT,ORGANIC CLAY <br /> IMORE THAN 50% SILTY AND CLAY INORGANIC MH SILT OF HIGH PLASTICITY,ELASTIC SILT <br /> PASSING ON THE LIQUID LIMIT CH CLAY OF HIGH PLASTICITY,FAT CLAY <br /> NO.200 SIEVE 50%OR MORE ORGANIC OH ORGANIC SILT,ORGANIC SILT <br /> HIGHLY ORGANIC SOILS PT PEAT AND OTHER HIGHLY ORGANIC SOILS <br /> NOTES: SOIL MOISTURE MODIFIERS: <br /> 1. FIELD CLASSIFICATION IS BASED ON VISUAL EXAMINATION DRY-ABSENCE OF MOISTURE,DUSTY,DRY TO <br /> OF SOIL IN GENERAL ACCORDANCE WITH ASTM D2488-83. THE TOUCH <br /> 2. SOIL CLASSIFICATION USING LABORATORY TESTS IS BASED SLIGHTLY MOIST-TRACE MOISTURE,NOT DUSTY <br /> ON ASTM 02487 83, MOIST-DAMP.BUT NO VISIBLE WATER <br /> 3. DESCRIPTIONS OF SOIL DENSITY OR CONSISTENCY ARE VERY MOIST VERY DAMP,MOISTURE FELT TO THE TOUCH <br /> BASED ON INTERPRETATION OF BLOW-COUNT DATA,VISUAL WET-VISIBLE FREE WATER OR SATURATED, <br /> APPEARANCE OF SOILS,AND/OR TEST DATA. USUALLY SOIL IS OBTAINED FROM BELOW <br /> WATER TABLE <br /> LIU & ASSOCIATES, INC. UNIFIED SOIL CLASSIFICATION SYSTEM <br /> Geotechnical Engineering • Engineering Geology • Earth Science <br /> PLATE 3 <br />