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Table 1 <br /> Groundwater Monitoring Data and Analytical Results <br /> Tosco(Former BP) Service Station##11192 <br /> 1403 Country 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 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/Trip Biank <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 eievations 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-Cl 2 <br /> 3 Original sample bottles broken, resampled <br /> 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 @ MTBE <br /> a Laboratory report indicates hydrocarbon pattern is present in the requested fuel quantitation range but does not resemble the pattern of the requested fuel <br /> v Laboratory report indicates the concentration indicated for this analyte is an estimated value above the calibration range of the instrument <br /> 30 Well development performed <br /> It 192 x1980288 � A6114/03 <br />