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UNIFIED SOIL CLASSIFICATION SYSTEM <br /> MAJOR DIVISIONS LTR DESCRIPTION MAJOR DIVISIONS LTR DESCRIPTION <br /> GW Well—graded grovels or gravel and Inorganic silts and very fine sands, <br /> sand mixtures, little or no fines. ML rock flour, silty or clayey fine <br /> Poorly—graded gravels or gravel SILTS sands or clayey silts with slight <br /> AWL CP sand mixture, little or no fines. AND plasticity, <br /> ANn <br /> GRAVELLY 5ilty grovels. gravef—sand—silt CLAYS Inorganic clays or low to medium <br /> SOILS GM mixtures. LL <50 CL plasticity, gravelly clays, sandy <br /> clays, lean days. <br /> COARSE GC Clayey grovels, gravel—sand—clay Organic silts and organic silt—clays <br /> GRAINED mixtures. RNE �L of low plasticity. <br /> SOILS SW sande or gravelly SOILS GRAINED Inorganic clays or low to medium <br /> sands, little or no fines AIH plasticity, gravelly clays, sandy <br /> SAND Poorly-graded sands or gravcfly SILTS clays, lean days. <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 >56 OH Organic clays of medium to high <br /> plasticity. <br /> SC Clayey sands, sond—silt mixtures. HIGHSYOIOSGANIC PT Peat and other highly organic sails. <br /> 0 El Sand pack <br /> I depth through which <br /> I sampler is driven. <br /> ■ Bentonite annular seal <br /> Relatively undisturbed sample <br /> 1 <br /> 0 Neat cement annular seal <br /> Missed sample <br /> ❑ Blank PVC <br /> V Ground water level <br /> - observed in boring <br /> Machine—slotted PVC <br /> S-10 Sample number <br /> PID Photoionization detector reading PVC Centralizer <br /> r <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 /> 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 />+ UNIFIED SOIL CLASSIFICATION SYSTEM PLATE <br /> AND SYMBOL KEY <br /> it��J•��� ARCO Service Station No. 548 3 <br /> RLE No. 1612 Hammer Lane <br /> PROJECT NO. 30004 0004D4A Stockton, California <br />