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UNIFIED SOIL CLASSIFICATION SYSTEM <br />MAJOR DMSIONS <br />GROUP PP <br />GROUP NAME <br />GRAVEL <br />CLEAN GRAVEL <br />GW <br />WELWRADED GRAVEL, FINE M COARSE GRAVEL <br />COARSE - <br />GRAINED <br />MORE DIAN 50% OF <br />GP <br />POORLY -GRADED GRAVEL <br />SOILS <br />COARSE <br />RETAINED FoN NO RACTIO4 <br />SIEVE <br />GRAVEL <br />GM <br />SILTY GRAVEL <br />WITH FINES <br />GC <br />CIAYEYGRAVEL <br />R ErnWED ON <br />SAND <br />CLEAN SAND <br />WELL-GRADED SAND, FINE TO COARSE SAND <br />NO 200 SIEVE NO <br />SP <br />POORLY -GRADED SAND <br />MORE 1HM15096 OF <br />SANG <br />COARSE FRACTION <br />PASSES NO.4 SIEVE <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 />GRAINED <br />LIQUID LIMIT <br />CL <br />CLAY <br />LESS THAN 50% <br />SOILS <br />ORGANIC <br />OL <br />oRcrwLc SILT, oRGANTc CLAY <br />MORE TMN 50% <br />EVE PASSES NO.200 SI <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 />LQRD LUIT <br />50% OR MORE <br />ORGANIC <br />OH <br />ORGFMC CLAY, GAGA NIC SILT <br />HIGHLY ORGANIC SOILS <br />PT <br />PEAT <br />NOTES: <br />SOIL MOISTURE MODIFIERS <br />I ) Field classification Is based on <br />visual examinatlon of soil in general Dry- Absence of moisture, dusty, dry <br />accordance with ASTM D 2488.83. to the touch <br />Moist- Damp, but no visible water <br />2) Soil classification using laboratory <br />tests IS based on ASTM D 2487.8b. Wet- Visible free water or saturated, <br />usually soil is obtained from <br />3) Descriptions of sou density or 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-COWRETTE & ASSOCIATES, INC. <br />UNIFIED SOIL CLASSIFICATION SYSTEM <br />CONSULTMG GEOTEC.WCAL ENGINEERS, GEOLOGISTS <br />AND ENVPMWENTAL SCIENTISTS <br />FIGURE 3 <br />