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i <br /> Unified Soil Classification System <br /> MAJOR OIVISIONS sYMeOL GnOUP NAME <br /> GRAVEL CLEAN GRAVEL GW VJELL�GRADED GRAVEL,FINE TO COARSE GRAVEL <br /> COARSE- <br /> POORLY-GRADED GRAVEL <br /> GRAINED MORE THAN 50%OF �P <br /> COARSE FRACTION <br /> SOILS RETAINED ON NO.4 GRAVEL GM SILTY GRAVEL <br /> SiEVE WITH FINES <br /> GC CLAYEYGRAVEL <br /> MORETHAN50% CLEAN SAND <br /> RETAINED ON SAND SW WELL-GRADE�SAND,FINE TO COARSE SAND <br /> NO.200 SIEVE <br /> SP POORIY-GRADED SAND <br /> MORE THAN 50%OF <br /> COARSE FRACTION SAND <br /> PASSESN0.45IEVE �/�IITHFINES SM SILfYSAND <br /> SC CLAYEY SANO <br /> SlLTANDCLAY INORGANIC ML Si�7 <br /> FINE- <br /> GRAINED �IQUIO LIMIT CL CLAY <br /> LESS THAN 50% <br /> SOILS I ORGANIC OL ORGANIC SILT,ORGANIC CLAY <br /> MORE THAN SQ% SILT AND CLAY INORGANIC SILT OF HIGH PLASTICIN,ELASTIC SILT <br /> PASSES NO.20C SIEV MH <br /> LIQUID LIMIT CH CLAY OF HIGH PLASTICIN,FAT CLAY <br /> 50%ORMORE <br /> ORGANIC QF{ ORGANIC CLAY,ORGANIC 51'.T <br /> HIGHLY ORGANIC SOILS PT P�+T <br /> NOTES: <br /> SOIL MOISTURE MODIFIERS <br /> 1) Field classificalion is based on Di y-Absence of moisture, dusty, dry <br /> visual examination of soil in general io lhe touch <br /> accordance with ASTM D 2488-83. <br /> 2) Soil classification using laboratory Moist-Oamp, but no visible water <br /> tests is based on ASTM D 2487-83. Wet-Visible free water or saturated, <br /> usually soil is obtained from <br /> 3) Descriptions of soil density or below water table <br /> consistency are based on <br /> interpretation of blowcount data, <br /> visual appearance of soils, and/or , <br /> test data. ! <br /> Cornerstone Phone (425�844-1977 Unified Soil Clas�ification System <br /> Geotechnical� II�C. Fax:(425)844-1987 <br /> , Figure 4 <br /> 17625-130th Ave NE,G102•Woodinville,WA• 98072 <br /> ! �g ��� <br /> � <br />