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' ADDITIONAL GROUND WATER MONITORING WELL INSTALLATION AND <br /> OU rERLY GROUND WATER MONITORING REPORT, FIRST QUARTER 1992 <br /> Exxon Station RIS 7-3708 ^ <br /> 2705 Country Club Boulevard <br /> Stockton, Caldorrua <br /> Delta Project No 40-91-838 <br /> Page 7 <br /> TABLE 3 <br /> ' Ground Water Sample Analytical Results <br /> Concentrations in Parts per Billson(ppb) <br /> ' Morutormg i Ethyl- <br /> Well Date Benzene Toluene benzene Xylenes TPH <br /> ' MW-1 08/29/91 <05 <05 <05 <0 5 <50 <br /> 12/13/91 <05 <05 <05 <05 75 <br /> ' 03/18/92 <05 <05 <05 <05 <50 <br /> MW-2 08/29/91 <05 <05 49 <0 5 82 <br /> 12/13/91 <0 5 <05 <05 <0 5 <50 <br /> 03/18/92 0 9 <0 5 <05 <0 5 <50 <br /> MW-3 08/29/91 240 3 4 <25 3 5 630 <br /> 12/13/91 270 80 <0 5 <05 560 <br /> 03/18/92 79 05 07 <05 170 <br /> MW-4 02/I0/92 <05 0.9 <05 09 916 <br /> 03/18/92 <0 5 <05 <05 <0 5 91c <br /> MW-5 02/10/92 19 <05 <0 5 <0 5 51d <br /> 03/18/92 06 <05 <05 <05 <50e <br /> ' MW-6 02/11/92 06 <05 <05 <05 51d <br /> 03/18/92 06 <05 <05 <05 <50f <br /> ' a Total Petroleum Hydrocarbons as gasoline <br /> b Atypical chromatogram Three unknown peaks were observed Chlorinated hydrocarbons are suspected <br /> ' c Atypical chromatogram Analysis of thus sample by EPA Method 624 on Apnl 17, 1992, (past EPA <br /> recommended holding time) was positive for the following chlonnated hydrocarbons vmylchlonde, <br /> ' cis-1,2-dichlorethene, tnehloroethene and tetrachlorethene These peaks resulted m a positive fuel <br /> hydrocarbon result <br /> ' d Atypical chromatogram Four unknown peaks were observed causing a positive fuel hydrocarbon result <br /> Chlormated hydrocarbons are suspected <br /> e Atypical chromatogram An unknown peak was observed between MTBE and benzene Chlorinated <br /> 1 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 /> RPT112 JDM <br />