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TII As <br /> Groundwater Monitonng ata and Analytical Results <br /> Former Tosco(Unocal)Service Station#4409 <br /> 1502 North El Dorado Street <br /> Stockton,California <br /> EXPLANATIONS <br /> TOC=Top of Casing TPH-G=Total Petroleum Hydrocarbons as Gasoline (ppb)=Parts per billion <br /> DTW=Depth to Water B=Benzene ND=Not Detected <br /> (ft)=Feet T=Toluene --=Not Measured/Not Analyzed <br /> S I =Screen Interval E=Ethylbenzene QA=Quality Assurance <br /> (ft bgs)=Feet Below Ground Surface X=Xylenes <br /> GWE=Groundwater Elevation MTBE=Methyl tertiary butyl ether <br /> (msI)=Mean sea level <br /> * TOC elevations were re-surveyed in November of 2001,by Siegfried Engineering,using the previous benchmark <br /> Previously,TOC elevations were surveyed relative to msl, per the City of Stockton Benchmark No 23,(Elevation=11 14 feet,msI)NGVD 29 <br /> I MTBE by EPA Method 8260 <br /> Z Laboratory report indicates gasoline C6-C12 <br /> 3 Laboratory report indicates weathered gasoline C6-C12 <br /> I <br /> 4 Well development performed <br /> 5 Detection linut raised Refer to analytical reports <br /> 6 Laboratory report indicates sample has a reported value of 100 ppb by EPA 802113,however,the EPA 8260B MTBE result on this sample is ND All of <br /> the data has been reviewed and no laboratory discrepancies were noted Based upon the data review,there was co-elution of MTBE with 3-methyl-pentane <br /> on the EPA 8021B analysis and the reported value of 100 ppb is a false positive The 8260B chromatogram and spectra have been reviewed for sample MW-10 and the <br /> MTBE result for this sample is ND <br /> 7 TPH-G,BTEX and MTBE by EPA Method 8260 <br /> B <br /> � Laboratory report indicates a hydrocarbon was present in the gasoline range that does not match the laboratory gasoline standard <br /> I <br /> I <br /> i 4409 zls/#180238 5 As of 07111/02 <br />