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At <br /> Groundwater Nioaitoro and Analytical Results , <br /> Tosco(Former BP)Service Station#11192 s <br /> 1403 Country Club Boulevard <br /> Stockton,California <br /> � f <br /> EMANATIONS; <br /> I <br /> Groundwater monitoring data and laboratory analytical results prior to November 11,2001,were complied by reports prepared by Blaine Tech Services,Inc. <br /> TQC=Top of Casing B=Benzene --=Not Measumd/Not Analyzed <br /> ($.)=Feet T=Toluene <br /> ND=Nat 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/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 /> MTBE by EPA Method 8260. <br /> 2 Laboratory report indicates gasoline C6-C 12. <br /> 3 Original sample bottles broken; resampled <br /> a TPH-G and BTEX by EPA Method 8260. <br /> s TPH-G,BTEX and MTBE by EPA Method 8260. <br /> b Additional analyses by EPA Method 8260. <br /> 7 Laboratory report indicates discrete peak Qa MTBE. <br /> 8 Laboratory report indicates hydrocarbon pattern is present in the requested fuel <br /> equ quantitation range but docs not resemble the pattern of the requested fuel. <br /> ° Laboratory report indicates the concentration indicated for this analyte is an estimated value above the calibration range of the instrument. <br /> 10 Well development op performed. <br /> I <br /> 11192.x1s/#180288 i As of 01/03/03 <br />