Laserfiche WebLink
Ms Marla Guensler <br /> October 14, 1992 <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 TPHaa <br /> MW-5 02/10/92 19 <05 <05 <05 5ld <br /> 03/18/92 06 <05 <05 <05 <50e <br /> 06/04/92 1 0 <05 <05 <05 <50 <br /> 09/28/92 07 <0 5 <05 <05 69 <br /> MW-6 02/11/92 06 <05 <05 <05 51d <br /> 03/18/92 06 <05 <05 <0 5 <50f <br /> 06/04/92 <05 <05 <05 <05 <50 <br /> 09/28/92 <05 <05 <05 <05 <50 <br /> a Total Petroleum Hydrocarbons as gasoline <br /> b Atypical chromatogram Three unknown peaks were observed Chlonnated 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 vinylchlonde, <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 /> e 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-dichMorobenzene <br /> The concentration of BTEX and TPH as gasoline in the ground water samples collected from <br /> monitoring wells MW-2 and MW-6 on September 28, 1992, were reported below the laboratory <br /> detection limits <br /> Concentrations of TPH as gasoline were detected in monitoring wells MW-3, MW4 and MW-5 <br /> at 680, 91, and 69 parts per billion(ppb), respectively Concentrations of benzene were detected in <br /> monitoring wells MW-1, MW-3 and MW-5 at 6 3, 300 and 0 7 ppb, respectively Only monitoring <br /> well MW-3 had detectable levels of toluene, ethylbenzene and xylenes at 5 9, 5 1 and 7 3 ppb The <br /> inferred distribution of dissolved benzene and TPH as gasoline in ground water beneath the site is <br /> illustrated in Figures 4 and 5 <br />