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Ta1 ' Groundwater Monitoring and Analytical Results Tosco(Circle K)Unit#01205 16470 Cambridge Street Lathrop,California EXPLANATIONS Groundwater monitoring data and laboratory analytical results prior to January 25, 1999,were compiled from reports prepared by Pacific Environmentdl Group,Inc TOC=Top of Casing TPII-G=Total Petroleum Hydrocarbons as Gasoline (ppb)=Parts per billion DTW=Depth to Water B=Benzene ND=Not Detected (ft}=Feet T=Toluene --=Not Measured/Not Analyzed S I =Screen Interval E=Ethylbenzene QA=Quality Assurance/Trip Blank (ft bgs)=Feet Below Ground Surface X=Xylenes GWE=Groundwater Elevation MTBE=Methyl tertiary butyl ether * TOC elevations have been surveyed relative to the San Joaquin County Benchmark No LTV-34 1 Laboratory report indicates gasoline and unidentified hydrocarbons C6-CI2 Z Detection limit raised Refer to analytical reports 3 MTBE by EPA Method 8260 4 Laboratory report indicates gasoline and unidentified hydrocarbons>C10 5 MTBE by EPA Method 8260 analyzed past hold time by 20 minutes 6 MTBE by EPA Method 8260 analyzed past hold time by 59 minutes 7 Laboratory report indicates gasoline C6-C 12 8 Laboratory report indicates weathered gasoline C6-C12 9 Laboratory report indicates hits confirmed past EPA recommended hold time 10 Laboratory indicates sample was analyzed outside of the EPA recommended holding time ii Well development performed iZ TPH-G,BTEX and MTBE by EPA Method 8260 13 MW-8 and MW-9 laboratory results appear to be switched and therefore results appear to be anomalous 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, it is unlikely that it was introduced during sample transport(as noted in the laboratory report) 15 Data provided by Secor international Inc 01205 xW#180183 1 As of 04/25/03