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TABLE 2-Continued <br /> GROUND WATER SAMPLE ANALYTICAL RESULTS <br /> Concentrations in micrograms per liter(µg/L) <br /> Former Exxon Service Station No 7-3708 <br /> 2705 Country Club Boulevard <br /> Stockton, Califorma <br /> Monitoring Ethyl- Total TPPHa as <br /> Well Date Benzene Toluene benzene Xylenes gasoline MTBE" <br /> MW-7 05/31/94 <0 5 <0 5 <0 5 <0 5 <50 NA <br /> 08/30/944 <0 5 <0 5 <0 5 <0 5 <50 NA <br /> 11/22/94d <0 5 <0 5 <0 5 <0 5 <50 NA <br /> 01/12/95' <0 5 <0 5 <0 5 <0 5 <50 NA <br /> 03/31/95 NS NS NS NS NS NS <br /> 04/05/95 <0 5 <0 5 <0 5 <0 5 <50 NA <br /> 07/14/95 <0 5 <0 5 <0 5 <0 5 <50 NA <br /> 10/05/95 <0 5 <0 5 <0 5 <0 5 <50 NA <br /> 04/02/96 NS NS NS NS NS NS <br /> 07/31/96 <0 5 <0 5 <0 5 <0 5 <50 NA <br /> 10/23/96 <0 5 <0 5 <0 5 <0 5 <50 <5 0 <br /> MW-8 05/31/94 <0 5 <0 5 <0 5 <0 5 <50 NA <br /> 08130/94' <0 5 <0 5 <0 5 <0 5 <50 NA <br /> 11/22/944 <0 5 <0 5 <0 5 <0 5 <50 NA <br /> 01112195' <0 5 <0 5 <0 5 <0 5 <50 NA <br /> • 03/31/95 NS NS NS NS NS NS <br /> 04/05/95 <0 5 <0 5 <0 5 <0 5 <50 NA <br /> 07/14/95 <0 5 <0 5 <0 5 <0 5 <50 NA <br /> 10/05/95 <0 5 <0 5 <0 5 <0 5 <50 NA <br /> 04/02/96 <0 5 <0 5 <0 5 <0 5 <50 NA <br /> 07/31/96 <0 5 <0 5 <0 5 <0 5 <50 NA <br /> 10/23/96 <0 5 <0 5 <0 5 <0 5 <50 <5 0 <br /> a Total purgeable petroleum hydrocarbons <br /> " Methyl tertiary butyl ether <br /> Not analyzed <br /> d Total volatile hydrocarbons <br /> ° Not sampled <br /> f Result is an estimated value because it exceeds the linear range <br /> 9 Atypical chromatogram with unidentified peak(s)within the range of gasoline hydrocarbons Chlorinated <br /> hydrocarbons are suspected A ground water sample collected from monitoring well MW-6 on <br /> April 17, 1992, contained chlorobenzene and 1,2-dichlorobenzene <br /> h Atypical chromatogram Analysis of this sample by EPA Method 624 on April 17, 1992 (past EPA <br /> recommended holding time), was positive for the following chlorinated hydrocarbons vinylchlonde, cis- <br /> 1,2-dichloroethene, tnchloroethane and tetrachlorethane These peaks resulted in a positive fuel <br /> hydrocarbon result <br /> ' Atypical chromatogram Four unknown peaks were observed causing a positive fuel hydrocarbon result <br /> Chlorinated hydrocarbons are suspected <br /> Atypical chromatogram An unknown peak was observed between MTBE and. benzene Chlorinated <br /> hydrocarbons are suspected <br /> '` Atypical chromatogram Analysis of this sample by EPA Method 624 on April 17, 1992 (past EPA <br /> recommended holding time) was positive for the following chlorinated hydrocarbons ch lorobenzene and <br /> 1,2-dichlorobenzene <br /> LRP004 809 <br />