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r <br /> Ms Marla Guensler <br /> January 13, 1993 <br /> Page 4 <br /> TABLE 2 - Continued <br /> GROUND WATER SAMPLE ANALYTICAL RESULTS <br /> Concentrations in Parts per Billion(ppb) <br /> Monitoring Ethyl- <br /> Well Date Benzene Toluene benzene Xylenes TPH� <br /> MW-4 02/10/92 <0 5 09 <05 0 9 91b <br /> 03/18/92 <05 <05 <0.5 <05 910 <br /> 06/04/92 0 6 <05 <05 <05 67 <br /> 09/28/92 <0 5 <05 <0 5 <05 91 <br /> 12/18/92 <05 <05 <05 <05 89 <br /> MW-5 02/10/92 1 9 <05 <05 <05 51d <br /> 03/18/92 06 <05 <05 <05 <50e <br /> 06/04/92 1 0 <05 <05 <05 <50 <br /> 09/28/92 0 7 <05 <05 <05 69 <br /> 12/18/92 12 <05 <05 <05 77 <br /> MW-6 02/11/92 0 6 <05 <05 <05 51" <br /> 03/18/92 06 <05 <05 <05 <50f <br /> 06/04/92 <05 <05 <05 <05 <50 <br /> 09/28/92 <05 <05 <05 <05 <50 <br /> 12/18/92 <05 <05 <05 <05 <50 <br /> 8 Total Petroleum Hydrocarbons as gasoline <br /> b Atypical chromatogram Three unknown peaks were observed Chlorinated 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 vmylchlonde, <br /> cis-1,2-dichlorethene, trichloroethene and tetrachlorethene These peaks resulted in a positive fuel <br /> hydrocarbon result <br /> d 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 /> 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 chlorobenzene and <br /> 1,2-dichlorobenzene <br /> The concentrations of BTEX and TPH as gasoline in the ground water samples collected from <br /> monitoring wells MW-2 and MW-6 on December 18, 1992, were below the laboratory detection <br /> limits Concentrations of TPH as gasoline were detected in monitoring wells MW-3, MW-4 and <br /> MW-5 at 4,000, 89, and 77 parts per billion (ppb), respectively Concentrations of benzene were <br /> detected to monitoring wells MW-1, MW-3 and MW-5 at 6 9, 1,700 and 1 2 ppb, respectively The <br /> inferred distribution of dissolved benzene in ground water beneath the site is illustrated in Figure 4 <br />