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Ta <br /> Groundwater Monitoring and Analytical Results • <br /> Tosco(Circle K)Unit#01205 <br /> 16470 Cambridge Street <br /> Lathrop,California <br /> EXPLANATIONS: <br /> Groundwater monitoring data and laboratory results prior to January 25, 1999,were compiled from reports prepared by Pacific Environmental Group,Inc <br /> TOC=Top of Casing B=Benzene (ppb)=Parts per billion <br /> DTW=Depth to Water T=Toluene ND=Not Detected <br /> (ft)=Feet E=Ethylbenzene --=Not MeasuredtNot Analyzed <br /> S I =Screen Interval X=Xylenes <br /> (ft bgs)=Feet Below Ground Surface MTBE=Methyl tertiary butyl ether <br /> GWE=Groundwater Elevation <br /> TPH-G=Total Petroleum Hydrocarbons as Gasoline <br /> * TOC elevations have been surveyed relative to the San Joaquin County Benchmark No UV-34 <br /> I Laboratory report indicates gasoline and unidentified hydrocarbons C6-C12 <br /> 2 Detection limit raised Refer to analytical reports <br /> s MTBE by EPA Method 8260 <br /> Laboratory report indicates gasoline and unidentified hydrocarbons>CIO <br /> 5 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-C12 <br /> 9 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 /> 11 Well development performed <br /> iZ MTBE by EPA Method 8260 with a raised detection limit Refer to analytical reports <br /> 01205 xis/#180183 4 As of 01/08/01 <br />