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T�Groundwater Momtorin to and Analytical Results <br /> Tosco(Circle K)Unit#01205 <br /> 16470 Cambridge Street <br /> Lathrop,California <br /> EXPLANATIONS <br /> i <br /> Groundwater monitoring data and laboratory analytical results prior to January 25, 1999,were compiled from reports prepared by Pacific Environmental Group Inc <br /> TOC=Top of Casing TPH-G=Total Petroleum Hydrocarbons as Gasoline (ppb)=Parts per billion <br /> (ft)=Feet B=Benzene ND=Not Detected <br /> DTW=Depth to Water T=Toluene --=Not Measured/Not Analyzed <br /> S I =Screen Interval E=Ethylbenzene <br /> (ft bgs)=Feet Below Ground Surface X=Xylenes <br /> GWE=Groundwater Elevation MTBE=Methyl tertiary butyl ether <br /> TOG elevations have been surveyed relative to the San Joaquin County Benchmark No UV-34 <br /> Laboratory report indicates gasoline and unidentified hydrocarbons C6-C12 <br /> Detection limit raised Refer to analytical reports <br /> ' MTBE by EPA Method 8260 <br /> Laboratory report indicates gasoline and unidentified hydrocarbons>C10 <br /> 5 MTBE by EPA Method 8260 analyzed past hold time by 20 minutes <br /> F MTBE by EPA Method 8260 analyzed past hold time by 59 minutes <br /> i <br /> 7 Laboratory report indicates gasoline C6-C12 <br /> s 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 /> n Well development performed <br /> 1 <br /> 01205 xis/#180183 5 As of 01/29/02 <br />