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TABLE 2-Continued <br /> GROUND WATER SAMPLE ANALYTICAL RESULTS <br /> Concentrations in micrograms per liter (jAg/L) <br /> Former Exxon Service Station No 7-3708 <br /> 2705 Country Club Boulevard <br /> Stockton, California <br /> Monitoring Ethyl- Total TPH° as <br /> Well Date Benzene Toluene benzene Xylenes asp ollne <br /> MW-7 05/31/94 <0 5 <0 5 <05 <0 5 <50 <br /> 08/30/94b <05 <0 5 <05 <0 5 <50 <br /> 11/22/94b <05 <0 5 <0 5 <0 5 <50 <br /> 01/12/95b <05 <0 5 <05 <0 5 <50 <br /> 03/31/95 NS NS NS NS NS <br /> 04/05/95 <05 <05 <05 <05 <50 <br /> 07/14/95 <0 5 <05 <05 <05 <50 <br /> 10/05/95 <05 <05 <05 <0 5 <50 <br /> 04/02/96 NS NS NS NS NS <br /> 07/31/96 <05 <05 <0 5 <0 5 <50 <br /> MW-8 05/31/94 <05 <0 5 <05 <05 <50 <br /> 08/30/94b <05 <05 <05 <05 <50 <br /> 11/22/941 <0 5 <05 <05 <0 5 <50 <br /> 01/12/95b <05 <05 <05 <0 5 <50 <br /> 03/31/95 NS NS NS NS NS <br /> 04/05/95 <0 5 <05 <05 <0 5 <50 <br /> 07/14/95 <0 5 <05 <05 <0 5 <50 <br /> 10/05/95 <05 <05 <0 5 <0 5 <50 <br /> 04/02/96 <05 <05 <0 5 <0 5 <50 <br /> 07/31/96 <0 5 <05 <05 <0 5 <50 <br /> a Total petroleum hydrocarbons <br /> b Total volatile hydrocarbons <br /> 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 /> d Not sampled <br /> Result is an estimated value because it exceeds the linear range <br /> e 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 vmnylchlonde, cis-1,2- <br /> dichloroethene, trichloroethane and tetrachlorethane These peaks resulted in a positive fuel hydrocarbon <br /> result <br /> a 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 chlorobenzene and 1,2- <br /> dichlorobenzene <br /> LRM/ 809 <br />