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Table 1 <br /> Groundwater Monitoring Data and Analytical Results <br /> Tosco{Former BP)Service Station#11192 <br /> 11403 Country Club Boulevard <br /> Ep Stockton,California <br /> EXPLANATIONS: <br /> Groundwater monitoring data and laboratory analytical results prior to November 11,2001,were complied by reports prepared by Blaine Tech Services,Inc. <br /> TOC=Top of Casing B=B��nzene --=Not Measured/Not Analyzed <br /> (R.)=1✓eet T=Ti�luene ND=Vot detected <br /> DTW=Depth to Water E=Ethylbenzene PP=Pre-purge sample <br /> GWE=Groundwater Elevation X=Xylenes D=Di plicate sample <br /> (msl)=Mean sea level MTBE=Methyl tertiary butyl ether QA=Quality Assurance/Trip Blank i <br /> TPH-G=Total Petroleum Hydrocarbons as Gasoline (ppb)�E Parts per billion <br /> * TOC elevations for wells MW-12 and MW-13 were surveyed on December 23,2002,by Virgil Chavez Land Surveying,using the previous benchmark. TOC elevations were <br /> surveyed on September 20,2001,by Virgil Chavez Land Surveying. The benchmark for the survey was a City of Stockton benchmark,being a disk m monument box,in the <br /> intersection of Country Club Boulevard and Pershing Avenue,(Benchmark Elevation=4.71 feet,NGVD 29). <br /> 1 MTBE by EPA Method 8260. <br /> Z Laboratory report indicates gasoline C6-C12. <br /> 3 Original sample bottles broken; resampled. <br /> 4 TPH-G and BTEX by EPA Method 8260. <br /> s TPH-G,BTEX and MTBE by EPA Method 8260. <br /> s Additional analyses by EPA Method 8260. <br /> Laboratory report indicates discrete peak Q MTBE. <br /> B Laboratory report indicates hydrocarbon pattern is present in the requested fuel quantitation range but does not resemble the pattern of the requested fuel. <br /> 9 Laboratory report indicates the concentration indicated for this analyte is an estimated value above the calibration range of the instrument. <br /> S0 <br /> Well development performed. <br /> i <br /> i <br /> i <br /> Y <br /> 11192a1.!!►f 80288 *05/14/03 <br />