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UNIFIED SOIL CLASSIFICATION SYSTEM MAJOR DIVISIONS LTR DESCRIPTION MAJOR DIVISIONS LIR DESCRIPTION Well—graded gravels or gravel and Inorganic silts and very fine sands sand mixtures little or no fines ML rock flour silty or clayey fine Poorly—graded ravels or ravel SILTS sands or clayey silts with slight OP9 9 plasticit �� sand mixture little or no fines AND CLAYS Inorganic clays or low to medium GRAVELLY Silty gravels gravel—sand—silt LL <50 CL plasticity, gravelly clays sandy SOILS GIA mixtures clays lean clays COARSE Clayey gravels, gravel—sand—clay OL Organic sifts and organic silt—clays COA COARSEED mixtures F1NE of law plasticity SOILS Well—graded sands or gravelly GRAINED Inorganic clays or law to medium Ssands little or no fines SOILS µH plasticity, gravelly clays sandy SAND Poorly—graded sands or gravelly SILTS clays lean clays AND SP sand mixture little or no Fines AND Inorganic clays of high plasticity, SANDY CLAYS CH fat clays SOILS SM Silty sands sand—silt mixtures LL >50 OH Organic clays of medium to high Plasticity SG Clayey sands, sand—silt mixtures HIGHLY 5 ORGANIC PT Peat and other highly organic sails ❑ Sand pack Depth through which sampler Is driven ® Bentonite annular seoi Relatively undisturbed sample T ❑ Neat cement annular seal Missed sample ❑ Blank PVC ® Ground water level observed In bonng Machine—slotted PVC S-10 Sample number PVC Centralizer PID Photolonlzatlon detector reading BLOW/FT REPRESENTS THE NUMBER OF BLOWS OF A 140—POUND HAMMER FALLING 30 INCHES TO DRIVE THE SAMPLER THROUGH THE LAST 12 INCHES OF AN 18 INCH PENETRATION DASHED LINES SEPARATING UNITS OF THE LOG REPRESENT APPROXIMATE BOUNDARIES ONLY ACTUAL BOUNDARIES MAY BE GRADUAL LOGS REPRESENT SUBSURFACE CONDITIONS IN THE BORING AT THE TIME OF DRILLING ONLY _ UNIFIED SOIL CLASSIFICATION SYSTEM PLATE �•-� —� AND SYMBOL KEY ARCO Service Station No. 2968 3 FlLE No 447 West Charter Way PROJECT NO. 37009-4W ioosa Stockton, Calitorma