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Ta" <br /> • Groundwater MonitoringlWa and Analytical Results <br /> Chevron Service Station#9-4275 <br /> 2905 West Benjamin Holt Drive <br /> Stockton,California <br /> WELL ID/ TOC ... .................... . . . .. <br /> ....................... <br /> MTBE: <br /> .......... <br /> . . . . . ...... ........... <br /> .................... .... . . . . <br /> .. ................. ... <br /> (Pp <br /> ppb.) pp. . . {PP <br /> b1 PP <br /> im <br /> TRIP BLANK(cont) <br /> 09110/98 <50 <0.5 <0.5 <0.5 <0.5 <2.5 <br /> 12/17/98 <50 <0-5 <0.5 <0.5 <0.5 <2.5 <br /> 03/10/99 <50 <0.5 <0.5 <0-5 <0.5 <2.5 <br /> 06/22/99 <50 <0-5 <0.5 <0.5 <0.5 <2-0 <br /> 09/13/99 <50 <0.5 <0-5 <0.5 <0.5 <15 <br /> 12/16/99 <50 <0-5 <0.5 <0.5 <0.5 <2-5 <br /> 12/22/99 <50 <0.5 <0.5 <0-5 <0-5 <5.0 <br /> 03/09/00 <50 <0.5 <0.5 <0-5 <0-5 <5.0 <br /> 06/13/00 <%O <0.500 <0-500 <0.500 <0.500 <5.00 <br /> 09113/00 <50,0 <0.500 <0.500 <0.500 <0.500 <5-00 <br /> 12/14/00 <50,0 <0.500 <0.500 <0.500 <1.50 30-0° <br /> 03/02/Ot (S) <50 <0-50 <0.50 <0.50 <0.50 <2.5 <br /> 03/02/019 (K) <50 <0.50 <0.50 <0-50 <0.50 <0.50 <br /> 05110/01 <50 <0.50 <0.50 <0-50 <0.50 <0.50 <br /> 08/20/01 <50 <0.50 <0.50 <0.50 <0.50 <0.50 <br /> EXPLANATIONS: <br /> Groundwater monitoring data and laboratory analytical results prior to June 13,2000,were compiled from reports prepared by Blaine Tech Services,Inc. <br /> TOC=Top of Casing B=Benzene --=Not Measured/Not Analyzed <br /> (ft.)=Feet T=Toluene (D)=Duplicate <br /> GWE=Groundwater Elevation E=Ethylbenzene (A)=Anomalous <br /> (msl)=Mean sea level X=Xylenes (S)=Sequoia Analytical <br /> DTW=Depth to Water MTBE=Methyl tertiary butyl ether (K)=Kiff Analytical <br /> TPH-G=Total Petroleum Hydrocarbons as Gasoline (ppb)=Parts per billion <br /> 1 Laboratory report indicates weathered gasoline C6-C12. <br /> 2 Laboratory report indicates gasoline C6-C12. <br /> 3 Laboratory report indicates unidentified hydrocarbons C6-C 12. <br /> 4 The result for this hydrocarbon is elevated due to the presence of single analyte peak(s)in the quantitation range. <br /> 5 Laboratory report indicates weathered gasoline. <br /> 6 Laboratory report indicates sample was reanalyzed on January 2,2001. MTBE did not confirm. Vial did contain headspace. <br /> 7 The TPH-Gasoline result was 1400 ppb which was attributed to the presence of MTBE. <br /> 8 Hydrocarbons were found in the range of gasoline,but do not resemble a gasoline fingerprint. <br /> 9 Analysis by EPA Method 8260. <br /> 9-4275-NF <br />