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UNIFIED SOIL CLASSIFICATION SYSTEM <br /> MAJORGROUP GROUP NAME <br /> DIVISIONS <br /> SYMBOL <br /> GRAVEL GW WELL-GRADED GRAVEL,FINE TO COARSE GRAVEL <br /> COARSE- CLEAN GRAVEL <br /> GP POORLY-GRADED GRAVEL <br /> 'GRAINED MORE THAN 50%OF <br /> COARSE FRACTION GRAVEL GM SILTY GRAVEL <br /> SOILS RETAINED ON NO.4 WITH FINES <br /> SIEVE GC CLAYEY GRAVEL <br /> SAND CLEAN SAND SW WELL-GRADED SAND,FINE TO COARSE SAND <br /> MORE THAN 50% SP POORLY-GRADED SAND <br /> RETAINED ON <br /> NO.200 SIEVE MORE THAN 50%OF <br /> COARSE FRACTION SAND SM SILTY SAND <br /> PASSES NO.4 SIEVE WITH FINES <br /> SC CLAYEY SAND <br /> FINE- SILT AND CLAY INORGANIC ML SILT <br /> GRAINED CL CLAY <br /> SOILS LIQUID LIMIT <br /> LESS THAN 50% ORGANIC OL ORGANIC SILT,ORGANIC CLAY <br /> SILT AND CLAY INORGANIC MH SILT OF HIGH PLASTICITY,ELASTIC SILT <br /> MORE THAN 50% CH CLAY OF HIGH PLASTICITY,FAT CLAY <br /> PASSES NO.200 SIEVE LIQUID LIMIT <br /> 50%OR MORE ORGANIC OH ORGANIC CLAY,ORGANIC SILT <br /> HIGHLY ORGANIC SOILS PT PEAT <br /> NOTES: SOIL MOISTURE MODIFIERS <br /> * 1) Field classification is based on Dry-Absence of moisture,dusty,dry <br /> visual examination of soil in general to the touch <br /> accordance with ASTM D 2488-93. <br /> * 2) Soil classification using laboratory Moist-Damp, but no visible water <br /> tests is based on ASTM D 2487-93. Wet-Visible free water or saturated, <br /> 3) Descriptions of soil density or usually soil is obtained from <br /> consistency are based on below water table <br /> interpretation of blowcount data, <br /> visual appearance,of soils,and/or <br /> test data. <br /> *Modifications have been applied to ASTM KEY TO BORING LOG SYMBOLS <br /> methods to describe sit and clay content. <br /> VGround water level <br /> Nss=NM*CE*CB*CR*Cs • Blows required to drive <br /> NM=blows/foot,measured in field sample 12 in. using SPT(converted to N6,) <br /> CE=ER,,,/60,convert measured hammer energy <br /> to 60%for comparison with design charts. MC(U)=%Moisture= ,(weight of water) <br /> CB=adjusts borehole diameter (Weight of dry soil) <br /> CR=rod length,adjusts for energy loss in rods DD=Dry Density <br /> Cs=Sample liner=1.0 <br /> — Letter symbol for soil type <br /> SM Contact between soil strata <br /> — — (Dashed line indicates approximate <br /> ML contact between soils) <br /> — Letter symbol for soil type <br /> NOTE:The stratification lines represent the approximate boundaries between soil types and the transition may be gradual <br /> PM: BAG Figure 3 <br /> ROBINSONFebruary 2018 <br /> NOBLE <br /> 3224-002A KPFF: Community Transit Merrill Creek Operating Base <br />