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TABLE 1 HISTORIC SOIL ANALYTICAL RESULTS FOR PETROLEUM HYDROCARBONS AND VOCS North Shore Parcels Stockton,California Results in micrograms per kilogram(ug/kg)except where noted Investigation Sample Sampling Boring TPH as TPH as TPH as Motor Ethyl- Total Volatile Depth Gasoline Diesel Benzene Toluene MTBE Organic Area Number Date Number (mglkg) (mg/kg) Oil(mg/kg} benzene Xylenes Compounds Analytical Method 8015M 8015M 8015M 8020 or 8260b 8260b 1513-8-10 5/2/2000 156-08 10 <0.94 <10 <50 <4.9 <4.9 <4.9 <4.9 <20 ND 15B-8-15 5/2/2000 1513-08 15 <0.97 <10 <50 <4.9 <4.9 <4.9 <4.9 20 ND 15B-8-6 5/2/2000 15B-08 6 <0.94 <10 <50 <5 <5 <5 <5 <20 NO 1513-9-10 5/2/2000 158-09 10 1,000 H,Y <200 <1,000 <1.3 <1.3 <1.3 ND -- 156-9-15 5/2/2000 15B-09 15 8,500 H,Y <400 <2,000 <2.5 <2.5 <2.5 59 C 1513.9-6 5/2/2000 15B-09 6 6.1 H,Y <10 <50 <0.0051 <0.0051 ND 0.0095 C - Notes: TPH=Total petroleum hydrocarbons --=Not analyzed or not applicable <0.5=Not detected at or above indicated method reporting limit. Analytical data qualifier codes: 1= Hydrocarbons include Diesel#2 and motor oil. 2=Asphalt present. 3=Kerosene plus motor oil and asphalt present. 4=Hydrocarbons in gasoline range are not typical of gasoline. C=Presence confirmed,but confirmation concentration differed by more than a factor of two. H=Heavier hydrocarbons contributed to quantitation. J-=Value estimated with a low bias due to issues identified in the case narrative or data validation reports. L=Lighter hydrocarbons contributed to quantitation, R=Results are rejected due to surrogate failure. Presence or absence of the analyte cannot be verified. UJ=Not detected above reported quantitation limit. However,the reported quantitation limit is approximate due to issues identified in case narrative or data validation reports. Y=Sample exhibits fuel pattern which does not resemble standard. Z=Sample exhibits unknown single peak or peaks. Page 2 of 2 7 lune 2001