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UNIFIED SOIL CLASSIFICATION SYSTEM <br /> MAJOR DIVISIONS LTR I DESCRIPTION MAJOR DIVISIONS ETR DESCRIPTION <br /> Well—graded gravels or gravel and I Inorganic silts and very fine sands <br /> Gw sand mixtures, little or no fines ML rock flour silty or clayey fine <br /> Poorl raded gravels or ravel SILTS sands or clayey silts with slight <br /> GRAVEL Ymi 9 Plasticity <br /> ANO GP sand mixture little or no fines CLAYS Inorganic clays or law to medium <br /> GRAVELLY Silty grovels gravel—sand—silt LL <50 CL plasticity gravelly clays sandy <br /> SOILS GMmixtures clays lean clays <br /> Clayey grovels gravel—sand—clay Organic silts and organic silt—clays <br /> COARSE mixtures FINE CL of low plasticity <br /> GRAINED GRAINED <br /> SDiLs Well—graded sands or gravelly Inorganic clays or low to medium <br /> Sw <br /> sands, little or no fines SOILS MH Plasticity, gravelly clays sandy <br /> SAND poorly—graded sands or gravelly SILTS clays lean clays <br /> AND 'P sand mixture little or no Fines AND Inorganic clays of high plasticity, <br /> SANDY CLAYS CH fat clays <br /> SOILS 5M Silty sands, sand—silt mixtures LL >50 Organic clays of medium to high <br />` OH plasticity <br /> SC Clayey sands, sand—silt mixtures HIGHLY ORGANIC <br /> SOILS PT pact and other highly organic sods <br /> El Sand pack <br /> 1 Depth through which <br /> sampler is driven <br /> Bentonite annular seal <br /> Relatively undisturbed sample <br />` �� ❑ Neat cement annular seal <br /> Missed sample <br /> ❑ Blank PVC <br /> V 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 /> —#_jk-AM UNIFIED SOIL CLASSIFICATION SYSTEM PLATE <br /> �� �r... AND SYMBOL KEY <br /> SA ARCO Service Station No. 2168 4 <br /> RLE NO 441 West Charter Way <br /> PROJECT NO. 31009 1009D3 Stockton, California <br />• <br />