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• Tao <br /> Groundwater Monitoring Data and Analytical Results <br /> Tosoo(Forager BP)Service Station A 1192 <br /> 1403 Cogently Club Boulevard <br /> 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 Casmrg B=Benzene --=Not MeasuredlNot Analyzed <br /> (ft.)=Feet T=Toluene ND=Not detected <br /> DTW=Depth to Water E=Ethylbenzene PP=Pro-purge sample <br /> GWE=Groundwater Elevation X=Xylenes D=Duplicate sample <br /> (msl)=Mean sea level MTBE=Methyl tertiary butyl ether QA=Quality AssurancefTrip 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 band 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 /> a Laboratory report indicates gasoline C6-C12 <br /> i 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 /> 6 Additional analyses by EPA Method 8260 <br /> 7 Laboratory report indicates discrete peak aQ MTBE <br /> I s <br /> Laboratory report indicates hydrocarbon pattern is present in the requested fuel quantitat un 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 /> 11192 x1+11!180288 1 As of 05/14103 <br />