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UNIFIED SOIL CLASSIFICATION SYSTEM MAJOR DIVISIONS LTR DESCRIPTION MAJOR DIVISIONS LTR DESCRIPTION Well—graded gravels or gravel and Inorganic slits and very flne sands, Cw sand mixtures little or no fines ML rack flour, silty or clayey fine Poorly—graded grovels or gravel SILTS sands or clayey silts with slight AN13 CGP sand mixture, little or no fines AND losbcii we GAYS Inorganic clays or IoM to medium GRAVELLY Silty gravels grovel—sand—silt SOILS GM mixtures ; LL CSD CL clays cileang gravelly clays, sandy f COARSE GC Clayey gravels, gravel—sand—clay Organic silts and organic silt—clays GRAINED mixtures RNE OL of low Plasticity SOILS Well—graded sands or gravelly GRAINED SOILS 11norganic claysor law to medium Sw sands little or no fines MH plasticity, gravelly clays sandy SAND poorly—graded sands or gravelly SILTS clays, lean clays AND SIR sand mixture little or no fines AND Inorganic clays of high plasticity, SANDY CLAYS CH fat. clays SOILS SM Silty sands, Bond—silt mixtures LL >50 Organic clays of medium to high OH plasticity SC Clayey sands, sand—silt mixtures HIGHLY 5 ORGANIC PT peat and other highly organic soils OILS Sand pack I � Depth through which sampler Is driven ■ Bentonite annular seal iRelatively undisturbed sample ❑ Neat cement annular seal Missed sample I ❑ Blank PVC ® Ground water level observed In bo Ing © Machine—slotted PVC 5-14 Sample number PID Photoionlzatlon detector reading PVC Centralizer 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. 6100 3 FILE NO 25775 South Patterson Paas PROJECT NO. 30041-2 I 0041 B20A Tracy, Calif ronla