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i TO � <br /> Groundwater Monitoring Data and Analytical Results <br /> Tosco(Former BP)Service Station##11192 <br /> 1403 Country Club Boulevard <br /> Stockton,California <br /> EXPLANA'T`IONS: <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 Assurance <br /> TPH-G=Total Petroleum Hydrocarbons as Gasoline (ppb)=Parts per billion 10 <br /> TOC elevations were surveyed on September 20,2001,by Virgil Chavez Land Surveying. The benchmark for the survey was a City of Stockton benchmark, <br /> being a disk in monument box,in the intersection of Country Club Boulevard and Pershing Avenue,(Benchmark Elevation=4.71 feet,NGVD 29). <br /> ' MTBE by EPA Method 8260. <br /> 2 Laboratory report indicates gasoline C6-C12. <br /> 3 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 /> Laboratory report indicates discrete peak at MTBE. <br /> 8 Laboratory report indicates hydrocarbon pattern is present in the requested fuel quantitation range but does not resemble the pattern of the requested fuel. <br /> 11 192.x1s/#180288 1 As of 08/08/02 <br />