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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 NL rock flour silty or clayey fine Poorly—graded ravels or ravel SILTS sands or clayey silts with slight GRAVEL 9 9 AND plasticity AND sand mixture, little or no fines CLAYS Inorganic clays or low to medium GRAVELLY Silty gravels gravei—sand—silt LL <5fl CL plasticity gravelly clays, sandy SOILS CLIA mixtures clays ]eon days Clayey gravels, gravel—sand—clay Organic silts and organic silt—clays COARSE mixtures RNE OL of low plasticity GRAINED GRAINED SOILS sw i Well—graded sands or gravelly Inorganic clays or low to medium sands tittle or no Mes SOILS MH plasticity gravelly clays, sandy SAND Poorly—graded sands or gravelly SILTS c]aye, lean days AND SP sand mixture hate or no fines AND Inorganic clays of high plasticity, SANDY CLAYS �H fat clays SOILS S11 Silty sands sand—silt mixtures LL >50 OH Organic clays of medium to high plasticity SC Clayey sands sand—silt mixtures HIGH YORGANIC PT peat and other highly organic soils ❑ Sand pack Depth through which 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 5-10 Sample number PVC Centralizer Pin Photoionizat]on 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. 2078 A-1 ME 140 800 East Kettlem8n Lane PROJECT NO. 30008 0008EIA Lodi, California