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Table 1 <br /> Groundwater Monitoring Data and Analytical Results <br /> Tosco (Former BP Oil) SS#11195 <br /> 16500 South I-5 <br /> Lathrop,California <br /> EXPLANATIONS: <br /> Groundwater monitoring data and analytical results prior to May 20, 1999,(with the exception of September 3, 1998),were compiled from reports prepared by Blaine Tech,Inc. <br /> TOC=Top of Casing B=Benzene (ppb)=Parts per billion <br /> DTW=Depth to Water T=Toluene ND=Not Detected <br /> (ft.bgs.)=Feet Below Ground Surface E=Ethylbenzene --=Not Measured/Not Analyzed <br /> S.I.=Screen Interval X=Xylenes CC=Conductor Casing <br /> GWE=Groundwater Elevation MTBE=Methyl tertiary butyl ether NP=No Purge <br /> (ms])=Mean sea level <br /> TPH-D=Total Petroleum Hydrocarbons as Diesel <br /> TPH-G=Total Petroleum Hydrocarbons as Gasoline <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 were <br /> referenced to San Joaquin datum,brass cap UV-34 at Mathey Road,45 feet north and 52 feet west of centerline(Elevation= 12.50 feet above ms]). <br /> MTBE by EPA Method 8260. <br /> 2 Laboratory report indicates discrete peak C6. <br /> 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 /> s Total Oil and Grease(TOG)was ND. <br /> S Halogenated Volatile Organic Compounds(HVOCs)were ND. <br /> 7 TOG was detected at 110 ppb. <br /> H Laboratory report indicates gasoline C6-C12. <br /> 9 Laboratory report indicates unidentified hydrocarbons C6-C12. <br /> 10 MTBE reported from dilution run. - <br /> i' This sample was analyzed outside of the EPA recommended holding time. <br /> 1l195.x1s1# ob17S T`a 'I As'(�:l bl <br />