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l <br /> UNIFIED SOIL CLASSIFICATION SYSTEM <br />' MAJOR DIVISIONS LTR DESCRIPTION MAJOR DIVISIONS LTR DESCRIPTION <br /> I Weil—graded grovels or gravel and I inorganic silts and very fine Ponds, <br /> aw sand mixtures, little or no fines MLrock flour, silty or clayey fine <br /> Poorly—graded gravels or gravel SILT'S sands city clayey silts with alight <br /> GRAVEL CP sand mixture, little or no fines AND <br /> AND CLAYS Inorganic clays or tow to medium <br /> GRAVELLY Silty gravels gravel—sand—silt LL <50 CL Plasticity, gravelly clays, Pandy <br /> SOILS GIA mixtures clays, lean clays <br />' Clayey gravels, gravel—sand—clay Organic silts and organic silt—clays <br /> GRAINEDCOAASE GC mixtures FINE OL of low plasticity <br /> SOILS Sw Well—graded sands or gravelly GSOILSD Inorganic clays or low to medium <br /> sands, little or no fines MH plasticity, gravelly clays, sandy <br /> SAND Poorly—graded sands or gravelly 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 /> I SOILS SN Silly sands, sand—silt mixtures LL >50OH Organic clays of medium to high <br />' Plasticity <br /> Clayey sands, sand—silt mixtures HIGHLY OOSCANIC PT Peat and other highly organic sods <br /> ❑ Sand pack <br /> I T Depth through which <br /> I sampler Is driven <br /> ■ Bentonite annular seal <br /> Relatively undisturbed sample <br /> Neat cement annular seal <br /> l � Missed sample <br /> F-1 Blank PVC <br /> Ground water level <br /> observed in boring <br /> I <br /> l Machine—slotted PVC <br /> S-10 Sample number <br /> PVC Centralizer <br /> PID Photosonizatlon detector reading <br /> I <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 /> l DASHED LINES SEPARATING UNITS OF THE LOG <br /> I 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—_��i AND SYMBOL KEY <br /> w� viii r <br /> OEM <br /> i�AWtWAPM7 ARCO Service Station No. 2130 4 <br /> FILE NO 790 <br /> PROJECT NO. 30003 00 3D8A Stiocldoni Ca {rest <br /> lifornia <br /> i <br /> F <br />