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T* Sr <br /> Joint Groundwater Monitoring Data and Analytical Results <br /> Arco Service Station#4932 <br /> 16 East Harding Way <br /> Stockton,California <br /> EXPLANATIONS <br /> Joint groundwater monitoring data and laboratory analytical results provided by Secor International, Inc <br /> TOC=Top of Casing TPH-G="Total Petroleum Hydrocarbons as Gasoline MTBE=Methyl tertiary butyl ether <br /> (ft)=Feet B= Benzene (ppb)=Parts per billion <br /> DTW=Depth to Water T=Toluene --—Not Measured/Not Analyzed <br /> GW E=Groundwater Elevation E=Ethylbenzene QCTB=Quality Control Trip Blank <br /> (msl)=Mean sea level X=Xylenes <br /> * TOC elevations are referenced to msl TOC elevations were surveyed by Morrow Surveying,inc in October,2000 The benchmark used for the survey <br /> was City of Stockton benchmark#24,a brass disc in monument well stamped 25-2,in traffic island at the northwest corner of Pacific Avenue and Harding Way, <br /> (Benchmark Elevation= 10 33 ft) <br /> ' Laboratory report indicates a hydrocarbon pattern is present in the requested fuel quantitation range but does not resemble the pattern of the requested fuel <br /> MTBE by EPA Method 8260 <br /> } Joint groundwater monitoring&sampling event was scheduled but not performed <br /> A Laboratory analytical resutls were not provided <br /> 5 TPH-G,BTEX and MTBE by EPA Method 8260 <br /> 6 Laboratory report indicates discrete peak @ C5-C6 <br /> 4409 xlsl#180238 19 As of 07/28/03 <br /> I <br />