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UNIFIED SOIL CLASSIFICATION SYSTEM MAJOR DIVISIONS LTR DESCRIPTION MAJOR DIVISIONS LTR DESCRIPTION Gw 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 gravels or gravei SILTS sands or clayey solis with slight GRAVEL GP sand mixture, little or no fines AND plasticity AND CLAYS Inorganic clays or low to medium GRAVELLY Silty grovels gravel—sand—silt LL <50 CL plasticity graveily clays sandy SOILS GM mixtures cloys lean clays COARSE Clayey gravels, gravel—sand—clay Organic silts and organic silt--clays GRAINED OC mixtures FINE OL of low plasticity SOILS SW Well—graded sands or gravelly GRAINED Inorganic clays or low to medium sands little or no fines MH plcshcity gravelly clays, sandy SANDPoorly—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 SC Clayey sands sand—sill mixtures HIGHLY pORGANIC PT pILSeat and other highly organic soils FSand pack I Depth through which I sampler is driven ■ Bentonite annular seal Relatively undisturbed sample ❑ Neat cement annular seal Missed sample ❑ Blank PVC Ground water level observed In boring Machine—slotted PVC S-10 Sample number PVC Centralizer PID Photoionizatlon 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 KAY ARCO Service Station No 2130 C1 FILE No 7906 North EI Dorado Street PROTECT NO. 30003 000308A Stockton, California