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UNIFIED SOIL CLASSIFICATION SYSTEM MAJOR DIVISIONS LTR DESCRIPTION MAJOR DIVISIONS LTR DESCRIPTION Well—graded gravels or gravel and Inorganic silts and very fine sands GW 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 m9 9plasticity cµvdt=l GP sand mixture, tittle or no fines AND CLAYS Inorganic clays or low to meaium GRAVELLY Silty gravels gravel--sand—silt LL <50 CL plasticity, gravelly ciaye sandy SDtLS GM mixtures clays lean cloys Clayey gravels gravel—sand—clay Orgamc slits and organic silt—clays COARSE GC mixtures FINE OL of low plasticity A SOILS SW Well—graded sands or gravelly GRAINED Inorganic clays or low to medium sands little or no fines SOILS MH plasticity gravelly clays sandy SAND Poorly—graded sands or graveiy SILTS clays lean clays AND SP sand mixture, little or no Fines AND Inorganic clays of high plasticity SANDY CLAYS CH fat clays SOILS Sri Silty sands, sand—silt mixtures LL >50 Organrc clays of medium to high OH plasticity SG i Clayey sands sand—silt mixtures HIGHLY ORGANIC PT SOIL5 Peat and other highly organic sails I ❑ Sand pack Depth through which sampler Is driven ■ Bentonite annular seal Relatively undisturbed sample ❑ Neat cement annular seal Missed sample F-1 Blank PVC V Ground water level observed In boring 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 Unocal Service Station No. 6981 FILE ND 4707 Pacific PROJECT NO. 38032 8032G3A Stockton, California