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• <br /> UNIFIED SOIL CLASSIFICATION SYSTEM <br /> •� MAJOR DIVISIONS LTR DESCRIPTION MAJOR DIVISIONS LTR DESCRIPTION <br /> CW Well—graded gravels or gravel and Inorganic silts and very fine sands, <br /> sand mixtures, little or no fines ML rock floor, silty or clayey fine <br /> Poorly—graded gravels or gravel SILTS sands or clayey silts with slight <br /> GRAVEL Gp sand mixture, little or no fines AND plasticity <br /> AND CLAYS Inorganic clays <br /> GRAVELY Silty ravels gravel—sand—sift 9 ys ly low , sandy <br /> SOILS GM y g S LL <50 CL plasticity, gravelly clays, sandy <br /> mixtures cloys lean clays <br /> • COARSE GC Clayey gravels gravel—sand—clay OL Oranic <br /> silts andd organic silt—cloys <br /> GRAINED mixtures FINE Ofaplastic <br /> SDILS Sw Well—graded sands or gravelly GRAINED Inorganic clays or law to medium <br /> sands, little or no fines SOILS MH plasticity, gravelly clays, sandy <br /> SAND Poorly—graded sands or gravely SILTS clays, lean cloys <br /> AND SIR sand mixture, little or no fines AND Inorganic clays of high plasticity <br /> SANDY CLAYS CH fat clays <br /> SOILS Silty sands, sond—silt mixtures LL >50 ON Organio clays of medium to high <br /> • plasticity <br /> SC Clayey sands, sand—silt mixtures HIGHLY ORGANIC PT <br /> SOILS Peat and other highly organic sods <br /> F-1 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 /> T 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 /> 13 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 />,t �_—_-_ UNIFIED SOIL CLASSIFICATION SYSTEM PLATE <br /> AND SYMBOL KEY <br /> Former Unocal Station No. 2859 3 <br /> PROJECT N4. 38012-70 �"E N0 1655 Pacific Avenue <br /> 8Q12Jl4A Stockton, California <br />• <br />