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UNIFIED SOIL CLASSIFICATION SYSTEM <br /> MAJOR DIVISIONS LTR DESCRIPTION MAJOR DIVISIONS LTR DESCRIPTION <br /> Gw Weli-graded gravels or gravel and Inorganic silts and very fine sands. <br /> gond mixtures, little or no fines NL rock flour, silty or clayey fine <br /> Poorly-graded grovels or gravel SILTS sands or clayey silts with slight <br /> GRAVEL GP sand mixture, utile or no fines. AND Plasticity, <br /> AND <br /> CLAYS Inorganic clays or low to medium <br /> GRAVELLY silty gravel*, gravel--sand-silt LL x54 CL plasticity, gravelly clays, sandy <br /> 5014 GM mixtures. clays, lean days. <br /> clayey gravels, gravel-sand-clay Organic silts and organic silt-clays <br /> COARSE GC <br /> GRAINED mixtures. FINE GL of low plasticity. <br /> GRAINED <br /> SOILS Weil-graded sonde or gravelly SOILS Inorganic clays or low to mediumsw i <br /> sands, little or no fines MH plasticity, gravelly cloys, sandy <br /> SAND Poorly-graded sands or gravelly 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 Sal Silly sands, sand-silt mixtures. LL >50 OH Organic clays of medium to high <br /> plasticity. <br /> SC Clayey sands, sand-silt mixtures. HICHSORSGANIC PT peat and other highly organic soils. <br /> Sand pack <br /> I Depth through which <br /> I sampler is driven. <br /> ■ Bentonite annular seal <br /> i Relatively undisturbed sample <br /> 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 /> PVC Centralizer <br /> PID Photoionization detector reading <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 v; <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 /> AMU <br /> � UNIFIED SOIL CLASSIFICATION SYSTEM PLATE <br /> •�•�• �•,••��—— AND SYMOL KEY <br /> i��t� AM ARCO Service Station No. 548 3 <br /> RLE Na. 1612 Hammer Lane <br /> PROJECT NO. 30004 �10041014A Stockton, Calitornla <br />