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I <br /> I UNIFIED SOIL CLASSIFICATION SYSTEM <br /> MAJOR DIVISIONS GROUP GROUP NAME <br /> ISYMBOL <br /> GRAVEL CLEAN GW WELL-GRADED GRAVEL,FINE TO COARSE GRAVEL <br /> ICOARSE- MORE THAN 50%OF GRAVEL . GP POORLY-GRADED GRAVEL <br /> GRAINED COARSE FRACTION GRAVEL WITH GM SILTY GRAVEL <br /> iSOILS RETAINED ON NO.4 SIEVE FINES GC CLAYEY GRAVEL <br /> ISAND CLEAN SW WELL-GRADED SAND,FINE TO COARSE SAND <br /> MORE THAN 50% MORE THAN 50%OF <br /> SAND SP POORLY-GRADED SAND <br /> II <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 /> IFINE- SILT AND CLAY INORGANIC ML SILT <br /> GRAINED CL CLAY <br /> LIQUID LIMIT <br /> ISOILS LESS THAN 50% ORGANIC OL ORGANIC SILT,ORGANIC CLAY <br /> • MORE THAN 50% SILTY AND CLAY INORGANIC MH SILT OF HIGH PLASTICITY,ELASTIC SILT <br /> I 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 /> IHIGHLY ORGANIC SOILS PT PEAT AND OTHER HIGHLY ORGANIC SOILS <br /> 1 NOTES: SOIL MOISTURE MODIFIERS: <br /> I 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 /> I 2. SOIL CLASSIFICATION USING LABORATORY TESTS IS BASED SLIGHTLY MOIST-TRACE MOISTURE,NOT DUSTY <br /> ON ASTM D2487 83. MOIST-DAMP,BUT NO VISIBLE WATER <br /> I 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 /> IWATER TABLE <br /> ILIU & ASSOCIATES, INC. UNiFI ED SOIL CLASSIFICATION SYSTEM <br /> IGeotechnical Engineering • Engineering Geology • Earth Science <br /> PLATE 3 <br /> I <br />