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UNIFIED SOIL CLASSIFICATION SYSTEM <br /> MAJOR DIVISIONS LTR DESCRIPTION MAJOR DIVISIONS LTR DESCRIPTION <br /> Well—graded gravels or gravel and Inorganic silts and very fine sands, <br /> GW sand mixtures, little or no fines. ML rock flour, silty or clayey fine <br /> Poorly—graded gravels or gravel SILTSsands or clayey silts with alight <br /> GRAVEL GP sand mixture, little or no fines. AND plasticity. <br /> AND CLAYS Inorganic cl <br /> GRAVELLY Silty grovels, gravel—sand—silt 9 ays or low to medium <br /> SOILS GM mixtures. LL <50 CL plasticity, gravelly clays, sandy <br /> clays, lean clays. <br /> COARSE Ge Clayey gravels, gravel—sand—clay OL Organic silts and organic silt—clays <br /> GRAINED mixtures. FINE of low plasticity. <br /> ' SOILS � Well—graded sands or gravelly SOILS GRAINED Inorganic clays or low to medium <br /> sands, little or no fines. MH plasticity, groveily clays, sandy <br /> SAND Poorly—graded sands or gravelly SILTS clays, lean cloys. <br /> AND SP sand mixture, little or no fines. AND Inorganic clays of high plasticity, <br /> SANDY CLAYS CH fat clays. <br /> • SOILS SM Silty sands, sand—silt mixtures. LL >50 OH Organic clays of medium to high <br /> plasticity. <br /> SC Clayey sands, sand—silt mixtures. HIGHLSYOIORGANIC pT I peat and other highly organic soils. <br /> Sand pack <br /> I Depth through which <br /> I sampler is driven. <br /> ■ Bentonite annular seal <br /> Relatively undisturbed sample <br /> 00 Neat cement annular seal <br /> Missed sample ❑ <br /> Blank PVC <br /> � Ground water level <br />• observed in boring <br /> © Machine—slotted PVC <br /> S-10 Sample number <br /> PID Photolonization detector reading PVC Centralizer <br /> BLOW/FT REPRESENTS THE NUMBER OF BLOWS OF A <br /> 140—POUND HAMMER FALLING 30 INCHES TO DRIVE <br /> THE SAMPLER THROUGH THE LAST 12 INCHES OF AN <br /> 18 INCH PENETRATION. <br />• <br /> DASHED LINES SEPARATING UNITS OF THE LOG <br /> REPRESENT APPROXIMATE BOUNDARIES ONLY. <br /> ACTUAL BOUNDARIES MAY BE GRADUAL LOGS <br /> REPRESENT SUBSURFACE CONDITIONS IN THE <br /> BORING AT THE TIME OF DRILLING ONLY. <br /> . t110FIED SOIL CLASSIFICATION SYSTEM PLATE <br /> ••==.: '"AMMA AND SYMBOL KEY <br /> ARCO Service Station Na 648 3 <br /> FILE NO. 1612 Hammer Lane <br /> M PROJECT NO. 30004-4 0004D4A Stockton, Callfornla <br />