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1 <br />t <br />UNIFIED SOIL CLASSIFICATION SYSTEM <br />MAJOR DMSIONS <br />GROUP <br />SYMBOL, <br />GROUP NAME <br />GRAVEL <br />CLEAN GRAVEL <br />GW <br />WE I -GRADED GRAVEL FINE TO COARSE GRAVEL <br />COARSE - <br />GRAINED <br />MORE THAN 50% OF <br />GP <br />POORLY -GRADED GRAVEL <br />COARSE <br />GRAVEL <br />GM <br />SILTY GRAVEL <br />SOILS <br />RETAINED ONHoa <br />SIEVE <br />WITH FINES <br />GC <br />CLAYEY GRAVEL <br />MORE RETAINED ON <br />SAND <br />CLEAN SAND <br />Sw <br />WELL -FADED SAND, FIDE TO COARSE SAND <br />NO.200 SIEVE <br />SP <br />POORLY -GRADED SAND <br />MORE THAN 50% OF <br />NO�� <br />SAND <br />S <br />WITH FINES <br />SM <br />SILTY SAND <br />SC <br />CLAYEY SAND <br />SILT AND CLAY <br />INORGANIC <br />ML <br />SILT <br />FINE - <br />CL <br />CLAY <br />GRAINED <br />LIQUID LIMIT <br />LESS THAN 50% <br />SOILS <br />ORGANIC <br />OL <br />ORGANIC SILT, oRGwx: cwv <br />PASSSES NO. 200 sE THAN�iEVE <br />SILT AND CLAY <br />INORGANIC <br />MH <br />SILT OF HIGH PLASTICITY, ELASTIC SILT <br />CH <br />CLAY OF HIGH PLASTICITY, FAT CLAY <br />LIQUID LIMIT <br />5D% OR MORE <br />ORGANIC <br />OH <br />ORGANIC CLAY, ORGANIC SILT <br />HIGHLY ORGANIC SOILS <br />PT <br />PEAT <br />NOTES: <br />SOIL MOISTURE MODIFIERS <br />1) Field classification Is based on pry_ Absence of moisture, dully dry <br />visual examination of soil In general <br />accordance with ASTM D 2488.83. To the touch <br />2) Soil classification using laboratory Molsf- Damp, but no visible water <br />tests is based on ASTM D 2487-83. Wet- Visible free water or saturated, <br />usually soli Is obtai Ted from <br />3) Descriptions of soil density or t able <br />below wafer table <br />consistency are based on <br />Interpretation of blowcount data, <br />visual appearance of soils, and/or <br />test data. <br />NELSON-COUVRETfE&ASSOCIATES, INC. <br />UNIFIED SOIL CLASSIFICATION SYSTEM <br />r�CONSrxnNG GEOTEC #AM ENGn,Ee+s, GEOLOGISTS <br />—�AND EPMRONUEN.uSVFWTSTS <br />FIGURE 3 <br />