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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 elevation B=Benzene ppb=Parts per billion <br /> DTW=Depth to Water T=Toluene ND=Not Detected <br /> (ft.)=Feet E=Ethylbenzene --=Not Measured/Not Analyzed <br /> GWE=Groundwater Elevation X=Xylenes <br /> (msl)=Referenced relative to mean sea level MTBE=Mcthyl tertiary butyl ether <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 msl). <br /> I MTBE by EPA Method 8260. <br /> z Laboratory report indicates discrete peak C6. <br /> 3 Detection limit raised. Refer to analytical reports. <br /> 4 MTBE,by EPA Method 8260 analyzed dilution past recommended holding time. Initial analysis was within hold time. <br /> 5 Total Oil and Grease(TOG)was ND. <br /> 6 Halongenated Volatile Organic Compounds(HVOCs)were ND. <br /> 7 TOG was detected at 110 ppb. <br /> 8 Laboratory report indicates gasoline C6-C12. <br /> 11195.xls/#180175 9 As of 11/19/99 <br />