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I <br /> UNIFIED SOIL CLASSIFICATION SYSTEM <br /> MAJOR DIVISIONS LTR DESCRIPTION MAJOR DIVISIONS LTR DESCRIPTION <br /> 1 Well—graded gravels or gravel and Inorganic silts and very fine sande, <br /> GW sand mixtures, little or no fines AIL rack flour, silty or clayey fine <br /> Poore raded ravels or ravel SILTS sands or clayey silts with slight <br /> GP Y-9 9 9 plasticity <br /> Gµv6Fl sand mixture, little or no fines CLAYDS Inorganic clays or low to medium <br /> GRAVELLY Silty gravels gravel—sand—silt LL <50 CL plasticity, gravelly clays sandy <br /> SOILS GM mixtures clays, lean clays <br /> CDARSE GC CClayey8gravels. gravel—sand—clay FINE of Organic <br /> ganicplassCand organic silt—clays <br /> 1 G GRAINED <br /> ity <br /> SOILS DILS Well—graded sands or gravelly Inorganic clays or low to medium <br /> SW sands, little or no fines SOILS MH Plasticity, gravelly clays, sandy <br /> SAND poorly—graded sands or gravely <br /> SILTS clays, lean clays <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 /> IV SC clayey sands, sand—silt mixtures HIGHLY OOSGANIC Pr peat and other highly organic soils <br /> ❑ Sand pack <br /> Depth through which <br /> 1 sampler Is driven <br /> ■ Bentonite annular seal <br /> Relatively undisturbed sample <br /> T � Neat cement annular seal <br /> Messed sample <br /> Blank PVC <br /> ® Ground water level <br /> - observed in boring <br /> © Machine—slotted PVC <br /> 1 5-10 Sample number <br /> PVC Centralizer <br /> PID Photolonlzatlon detector reading <br /> 1 BLOW/FT REPRESENTS THE NUMBER OF BLOWS OF A <br /> 14-0—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 /> 1� �.�>��i AND SYMBOL KEY <br /> �—"AF7AIN & ARCO Service Station No. 6100 <br /> `; <br /> NO 26775 South Patterson Pass <br /> PROJECT NO. 30041-2 0041 B20A Tracy, Calif ronia <br /> 1 <br />