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TABLE 2-Continued <br /> GROUND WATER SAMPLE ANALYTICAL RESULTS <br /> Concentrations in micrograms per liter (ug/l-) <br /> Exxon Retail Station No 7-3708 <br /> 2705 Country Club Boulevard <br /> Stockton, California <br /> Monitoring Ethyl- Total TPIP as <br /> Well Date Benzene Toluene benzene Xylenes gasoline <br /> MW-8 05/31/94 <05 <0 5 <05 <05 <50 <br /> 08130194" <05 <0 5 <0 5 <05 <50 <br /> 11/22/946 <05 <0 5 <0 5 <05 <50 <br /> 01/12/95" <0 5 <0 5 <05 <05 <50 <br /> 03/31/95 NS NS NS NS NS <br /> 04/05/95 <05 <0 5 <0 5 <05 <50 <br /> 07/14/95 <0.5 <05 <05 <0 5 <50 <br /> Total petroleum hydrocarbons <br /> " 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 momtonng 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 lmear range <br /> • f 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 vmylchlonde,cis-1,2- <br /> dichloroethene, trichloroethene and tetrachlorethene These peaks resulted in a positive fuel hydrocarbon <br /> result <br /> $ Atypical chromatogram Four unknown peaks were observed causing a positive fuel hydrocarbon result <br /> Chlorinated hydrocarbons are suspected <br /> b 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 tune)was positive for the following chlorinated hydrocarbons chlorobenzene and 1,2- <br /> dichlorobenzene <br /> LRP570 s1s <br />