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i <br /> UNIFIED SOIL CLASSIFICATION SYSTEM <br /> i <br /> I MAJOR DIVISIONS LTR DESCRIPTION MAJOR DIVISIONS LTR DESCRIPTION <br /> Well—graded gravels or gravel and Inorganic silts and very fine sands, <br /> aw sand mixtures little or no fines ML rock flour, silty or clayey fine <br /> Poorly—graded grovels or gravel SILTS sands or clayey slits with slight <br /> GRAVEL GP sand mixture, little or no fines AND plasticlix <br /> AND CLAYS Inorganic clays or low to medium <br /> GRAVELLY Silty gravels gravel—sand—silt <br /> SOILS GM mixtures LL <50 CL plaaNcity, gravelly clays, sandy <br /> clays, lean clays <br /> COARSE Clayey gravels, gravel—sand—clay OL Orgnrnc sifts and organic silt—clays <br /> GRAINED mixtures nNE of low plasticity <br /> SAILS Well—graded sands or gravelly GRAINED Inorgonic clays or low to medium <br /> SWsands, little or no fines SOILS mH plasticity, gravelly clays, sandy <br /> SN1D Poorly—graded =ands or gravelly SILTS clays, lean oloye <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 X50 OH Organic clays of medium to high <br /> plasticity <br /> SC Clayey sands, sand—silt mixtures HIGHLY ORGANIC PT <br /> SOILS Peat and other highly organic 90119 <br /> ❑ Sand pack <br /> I Depth through which <br /> I sampler is driven <br /> ■ Bentonite annular seal <br /> iRelatively 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 Photolonlzatlon 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 <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 /> ==::'= i --`-_ UNIFIED SOIL CLASSIFICATION SYSTEM PLATE <br /> AND SYMBOL KEY <br /> ARCO Service Station No. 8100 3 <br /> ____T <br /> FlLE No 23775 South Patterson Peas <br /> PROJECT NO. 30041 0041 B20A Tracy, CalifroNa <br />