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Groundwater Monitoring', a and Analytical Results <br /> Tosco(Former BP Oil)Service Station#111.95 <br /> 16500 South 1-5 <br /> Lathrop,California <br /> EXPLANATIONS: <br /> Groundwater monitoring data and laboralr­­analytical 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=Total 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 /> (msi)=Mean sea level MTBE=Methyl tertiary butyl ether <br /> TOC elevations referenced to cross it sidewalk,run from City of Lathrop Benchmark No.5(Elevation=9.22 feet,ms]). Prior to May 20, 1999,TOC elevations <br /> were referenced to San Joaquin datur,. Ili-ass cap UV-34 at Mathey Road,45 feet north and 52 feet west of centerline(Elevation 12.50 feet above ms]). <br /> I MTBE by EPA Method 8260. <br /> 2 Laboratory report indicates discrete pcik C6. <br /> 3 Detection limit raised. Refer to analy ical reports. <br /> 4 MTBE by EPA Method 8260 analyzer,dilution past recommended holding time. Initial analysis was within hold time. <br /> 5 Total Oil and Grease(TOG)was ND. <br /> Halogenated Volatile Organic Comp(, iids(HVOCs)were ND. <br /> TOG was detected at 110 ppb. <br /> Laboratory report indicates gasoline Cr-C 12. <br /> 9 Laboratory report indicates unidentil"i-I hydrocarbons C6-Cl 2. <br /> in MTBE reported from dilution run. <br /> 11 This sample was analyzed outside of ihe EPA recommended holding time. <br /> 12 Laboratory report indicates weatherers.2isoline C6-C12. <br /> I I 195.x181#1 80175 13 As of 11/21/01 <br />