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I <br /> Table I <br /> Groundwater Monitoring Data and Analytical Results <br /> Tosco(Circle K)Unit#01205 <br /> 16470 Cambridge Street <br /> Lathrop,California <br /> I <br /> EXPLANATIONS <br /> Groundwater monitoring data and laboratory analytical results prior to January 25, 1999,were compiled from reports prepared by Pacific Environmental Group,Inc <br /> jTOC=Top of Casing TPH-G=Total Petroleum Hydrocarbons as Gasoline' (ppb)=Parts per billion <br /> DTW=Depth to Water B=Benzene ND=Not Detected <br /> (ft)=Feet T=Toluene --=Not Measured/Not Analyzed <br /> S I =Screen Interval E=Ethylbenzene QA=Quality Assurance/Trip Blank <br /> (ft bgs)=Feet Below Ground Surface X=Xylenes <br /> GWE=Groundwater Elevation MTBE=Methyl tertiary butyl ether <br /> r <br /> * TOC elevations have been surveyed relative to the San Joaquin County Benchmark No W-34 <br /> i Laboratory report indicates gasoline and unidentified hydrocarbons C6-C12 <br /> Detection limit raised Refer to analytical reports <br /> 3 MTBE by EPA Method 8260 <br /> 4 Laboratory report indicates gasoline and unidentified hydrocarbons>C10 <br /> s MTBE by EPA Method 8260 analyzed past hold time by 20 minutes <br /> 6 MTBE by EPA Method 8260 analyzed past hold time by 59 minutes <br /> 7 Laboratory report indicates gasoline C6-Cl2 <br /> 8 Laboratory report indicates weathered gasoline C6-C12 <br /> 9 Laboratory report indicates hits confirmed past EPA recommended hold time <br /> 10 Laboratory indicates sample was analyzed outside of the EPA recommended holding time <br /> I I Well development performed <br /> i'- TPH-G,BTEX and MTBE by EPA Method 8260 <br /> S3 MW-8 and MW-9 laboratory results appear to be switched and therefore results appear to be anomalous <br /> 14 Laboratory report indicates Toluene was detected slightly above the reporting limit in the Trip Blank Because this compound was not seen in the samples, <br /> it is unlikely that it was introduced during sample transport(as noted in the laboratory report) <br /> Y5 Data provided by Secor international Inc <br /> 16 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 /> F <br /> h , <br /> 01205 80183 i A*7/25/03 <br />