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Table 1 <br /> Groundwater Monitoring and Analytical Results '^'Y <br /> Tosco(Former BP Oil)Service Station#11195 <br /> 16500 South 1-5 <br /> Lathrop,California <br /> Groundwater monitoring data and laboratory analytical results prior to May 20, 1999,(with the exception of September 3,1998),were compiled from reports <br /> prepared by Blaine Tech,Inc. <br /> TOC=Top of Casing TPH-D=Total Petroleum Hydrocarbons as Diesel (ppb)=Parts per billion <br /> DTW=Depth to Water TPH-G=Tota]Petroleum Hydrocarbons as Gasoline ND=Not Detected <br /> (ft.)=Feet - B=Benzene --=Not Measured/Not Analyzed <br /> S.I.=Screen Interval T=Toluene CC=Conductor Casing <br /> (ft.bgs)=Feet Below Ground Surface E=Ethylbenzene . NP=No Purge <br /> GWE=Groundwater Elevation X=Xylenes <br /> (msl)=Mean sea level MTBE=Methyl tertiary bury]ether <br /> * TOC elevations referenced to cross in sidewalk,run from City of Lathrop Benchmark No.5(Elevation=9.22 feet,msl). Prior to May 20, 1999,TOC elevations <br /> were referenced to San Joaquin datum,brass cap W-34 at Mathey Road,45 feet north and 52 feet west of centerline(Elevation=12.50 feet abovems]). <br /> 1 MTBE by EPAMethod 8260. <br /> 2 Laboratoryreport indicates discrete peak C6. <br /> 3 Detection limit raised. Refer to analytical reports. <br /> MTBE by EPA Method 8260 analyzed dilution past recommended holding time. Initial analysis was within hold time. <br /> 5 Tota]Oil and Grease(TOG)was ND. <br /> 6 Halogenated Volatile Organic Compounds(HVOCs)were ND. <br /> TOG was detected at 110 ppb. <br /> a Laboratory reportindicates gasoline C6-C12. <br /> 9 Laboratory report indicates unidentified hydrocarbons C6-C 12. <br /> 10 MTBE reported from dilution run. <br /> 1 This sample was analyzed outside of the EPA recommended holding time. <br /> 12 Laboratory report indicates weathered gasoline C6-C 12. <br /> As of 02/t}7/D2 <br /> 11195.As1#180175 13 <br />