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T1 ' <br /> Groundwater Monitarrn 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 compiled by reports prepared by Blame Tech Services,Inc <br /> B=Benzene --=Not Measured/Not Analyzed <br /> TOC=Top of Casing ND=Not detected <br /> (ft}=Feet T=Toluene <br /> E=Ethylbenzene PP=Pre-purge sample <br /> DTW=Depth to Water D=Duplicate sample <br /> GWE=Groundwater Elevation X=Xylenes <br /> MTBE=Methyl tertiary butyl ether QA=Quality Assurance/Trip Blank <br /> (msi)=Mean sea level <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, y g 2001 b 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 /> 3 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 /> 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 /> 9 Laboratory report indicates the concentration indicated for this analyte is an estimated value above the calibration range of the instrument <br /> 10 Well development performed <br /> 11192 xls/#180288 13 As of 01/03103 <br />