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I <br /> • Groundwater Morutan and Analytical Results <br /> Former Tosco(Un ernce Bratton#44119 <br /> 1502 North EI Dorado Street <br /> Stockton California <br /> �ANATIONS <br /> =Top of Casing TPH-G=Total Petroleum Hydrocarbons as Gasoline (ppb)=Parts per billion <br /> Feet B=Benzene ND=Not Detected <br /> =Depth to Water T=Toluene - =Not Measured/Not Analyzed <br /> Screen taterval E=Ethylbenzene QA=Quality Assurancerrnp Blank <br /> s)=Feet Below Ground Surface X=Xylenes <br /> =Groundwater Elevation MTBE=Methyl tertiary butyl ether <br /> =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 msl)NGVD 29 <br /> MTBE by EPA Method 8260 <br /> Laboratory report indicates gasoline C6-C12 <br /> Laboratory report indicates weathered gasoline C6-C 12 <br /> Well development performed <br /> Detection limit raised Refer to analytical reports <br /> Laboratory report indicates sample has a reported value of 100 ppb by EPA 8021B 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 8021E 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 /> TPH-G BTEX and MTBE by EPA Method 8260 <br /> Laboratory report indicates a hydrocarbon was present in the gasoline range that does not match the laboratory gasoline standard <br /> All reports issued through the July 11 2002,event reported an incorrect screen interval of 25 35 feet The correct screen interval is 25-45 feet <br /> 4409 xis!#180238 6 As of 11/14/02 <br />