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1Groundwater MonitorVe <br /> ata and Analytical Results <br /> Tosco(Former BP)Service Station#11192 ti <br /> 1403 Country Club Boulevard <br /> Stocicton,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=Benzene --=Not Measured/Not Analyzed <br /> (ft.)=Feet T=Toluene ND=Not detected <br /> DTW=Depth to Water E=Ethylbenzene PP=Pre-purge sample <br /> GWE=Groundwater Elevation X=Xylenes D=Duplicate sample <br /> (msl)=Mean sea level MTBE=Methyl tertiary butyl ether QA=Quality Assurances Trip Blank <br /> TPH-G=Total Petroleum Hydrocarbons as Gasoline (ppb)=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 in monument box,in the <br /> intersection of Country Club Boulevard and Pershing Avenue,(Benchmark Elevation=4.71 feet,NGVD 29). <br /> I MTBE by EPA Method 8260. <br /> 2 Laboratory report indicates gasoline C6-C12. <br /> 1 Original sample bottles broken; resampled. <br /> 4 TPH-G and BTEX by EPA Method 8260. <br /> 5 TPH-G,BTEX and MTBE by EPA Method 8260. <br /> 6 Additional analyses by EPA Method 8260, <br /> T Laboratory report indicates discrete peak @ MTBE. <br /> s 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 /> io Well development performed. <br /> Laboratory report indicates target analyte quantitated as TPH-Gas was detected in the trip blank at a concentration slightly above the Reporting Limit. <br /> It is unlikely that this was introduced during sample transport,since many of the samples were ND for TPH-Gas. <br /> 11192-As/#I80288 1 As of 08/14/03 <br />