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Iable 1 Groundwater Monitoringand Analytical Results Tosco(Circle Onit#41245 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 Environmental Group,Inc TOC=Top of Casing TPH-G=Total Petroleum Hydrocarbons as Gasoline (ppb)=Parts per billion DTW=Depth to Water B=Benzene ND=Not Detected UP=Feet T=Toluene --=Not Measured/Not Analyzed S I =Screen Interval E=Ethylbenzene QA=Quality AwuranceJTnp Blank (S.bgs)=Feet Below Ground Surface X=Xylenes GWE=Groundwater Elevation MTBE=Methyl ternary butyl ether * TOC elevations have been surveyed relative to the San Joaquin County Benchmark No W-34 I I Laboratory report indicates gasoline and unidentified hydrocarbons C6-C 12 2 Detection limit raised Refer to analytical reports 3 MTBE by EPA Method 8260 4 Laboratory report indicates gasoline and unidentified hydrocarbons>C10 s 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-C12 9 Laboratory report indicates weathered gasoline C6-02 9 Laboratory report indicates hits confirmed past EPA recommended hold time 10 Laboratory indicates sample was analyzed outside of the EPA recommended holding time I i 1 Well development performed 1z TPH-G,BTEX and MTBE by EPA Method 8260 is 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 m the laboratory report) is Data provided by 5ecor International Inc 01205.xls/#180183 8 As of 04/25/03