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Unified Soil Classification System <br /> MAJOR DIVISIONS GRouP GROUP NAME <br /> SYMBOL <br /> GRAVEL CLEAN GRAVEL GW WELL-GRADED GRAVEL,FINE TO COARSE GRAVEL <br /> COARSE- <br /> IGRAINED MORETHAN50%,OF GP POORLKGR40EDGRAVEL <br /> . COARSE FRACTION <br /> - SOILS RETAINED ON NO.4 GRAVEL <br /> SIEVE WITH FINES �M SIITYGRAVEL <br /> GC CIAYEY Gf2AVeL <br /> MORE THAN 50% <br /> � RETAINED ON SAND CLEAN SAND SW VJELL-GRADED SAND,FINETOCOARSE SAND <br /> number 200 SIEb'E <br /> SP POORLY-GRADED SAND <br /> � MORE THAN 5D°h OF <br /> COARSE FRACTION SAND <br /> PASSESN0.451EVE 1/yITHFINES SM SILTYSAND <br /> � SC CLAYEYSAND <br /> SILTAND CLAY INORGANIC ML SiLT <br /> 1 FINE- <br /> ! <br /> � GRAINED LI�UID LIMIT CL CLAY <br /> LE55 THAN 50% <br /> � SOILS ORGANIC <br /> OL ORGANIC SIIT,ORGANIC CLAY <br /> MORETHAN50% SILTANDCLAY INORGANIC <br /> I PASSES NO.2G0 SIEV MH SILT OF HIGH PLASTICIN,ELASTIC SILT <br /> i <br /> LIQUID LIMIT CH CLAY OF HIGH PLASTICITY,FAT CLAY <br /> 50°/OR MORE <br /> � ORGANIC OH ORGANIC CLAY,ORGANIC SIIT <br /> ' HIGHLY ORGANIC SOILS pT Penr <br /> i <br /> NOTES: <br /> SOIL MOISTURE MODIFIERS <br /> 1) Field c:assification is based on Dry-Absence of moisture, dusty, dry <br /> visual examination of soil in generai to the touch <br /> accordance with ASTM D 2488•83. <br /> 2) Soil classification using laboratory Moist-Damp, but�o visible water <br /> tests is based on ASTM D 2487-83. Wet-Visible free water or saturated, <br /> 3) Descriptions of soil density or usually soil is obtai��ed from <br /> cons�stency are based on below water table <br /> inlerpretation of blowcount data, <br /> visual appearence of soils, and/or <br /> test data. <br /> Corners#one Phone:(425)844-19i7 Unified Soil Classification System <br /> � Geotechnical� II�C. Fax:(425)844-1987 <br /> I <br /> 17625-130thAve NE,C-102 •Woodinville,WA• 98072 Figure 3 Il��� <br /> I <br />