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T1 • _ <br /> Groundwater Monitonn and Analytical Results <br /> Chevron Service Station#f9-3232 <br /> 8660 Lower Sacramento Road ` <br /> Stockton,California <br /> EXPLANATIONS: <br /> i <br /> i <br /> Groundwater monitoring data and laboratory analytical results prior to June 22,2000,were compiled from reports prepared by Blaine Tech Services,Inc <br /> TOC=Top of Casing TPH-G=Total Petroleum Hydrocarbons as Gasoline MTBE=Methyl tertiary butyl ether <br /> (ft)=Feet B=Benzene (ppb)=Parts per billion <br /> GWE=Groundwater Elevation T=Toluene <br /> --=Not Measured/Not Analyzed <br /> (msl)=Mean sea level E=Ethylbenzene QA=Quality Assurance <br /> DTW=Depth to Water X=Xylenes <br /> * TOC elevations were resurveyed in April of 2002 by Morrow Surveying Elevations are based on San Joaquin County Benchmark No 1N-6 Brass disk <br /> in well at Thorton and Davis Roads(Benchmark Elevation=14 43 feet) <br /> I TOC elevation changed due to well head maintenance <br /> 2 MTBE by EPA Method 8260 <br /> 3 Laboratory report indicates gasoline C6-C12 <br /> 4 Laboratory report indicates unidentified hydrocarbons C6-C12 <br /> S TOC has been altered <br /> 6 Well development P performed. <br /> T BTEX and MTBE by EPA Method 8260 <br /> 9-3232 xW#386463 5 As of 07/25/02 <br />