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rry� �► <br /> documentation are included as Appendix B An isoconcentration contour <br /> map of methyl-tertiary butyl ether (MTBE) concentrations is presented as <br /> Figure 3 <br /> I <br /> 4 0 CONCLUSIONS <br /> I <br /> • The groundwater sample collected from monitoring well MW-1 <br /> contained 56 ppb TPH-G and 5.7 ppb MTBE. <br /> • The groundwater sample collected from monitoring well MW-2 <br /> contained 530 ppb MTBE, 97 ppb tert-butanol (TBA), and 2 6 ppb <br /> TAME. <br /> • The groundwater sample collected from monitoring well MW-3 <br /> contained no detectable concentrations of all compounds tested. <br /> • The groundwater sample collected from monitoring well MW-4 <br /> contained 9.6 ppb MTBE and 0.51 ppb TAME. <br /> • The groundwater samples collected from monitoring well MW-5 <br /> contained 0 95 ppb MTBE <br /> • The groundwater sample collected from monitoring well MW-6 <br /> contained no detectable concentrations of all compounds tested. <br /> • No other hydrocarbons were detected above the laboratory method <br /> reporting limits in any of the groundwater samples collected. <br /> The MTBE concentration in the groundwater sample collected from <br /> monitoring well MW-2 exceeded the California Department of Health <br /> Services (DHS) Maximum Contaminant Levels (MCLs) for drinking water <br /> No other compound concentrations exceeded MCLs Hydrocarbon and <br /> oxygenate concentrations were generally lower with the previous <br /> quarter's concentrations. <br /> 5 0 RECOMMENDATIONS <br /> ASE recommends continuing operation of the ozone sparging system and <br /> quarterly groundwater monitoring. The next sampling is scheduled for <br /> January 2006 <br /> Singh's Unocal Service Station Quarterly Report - October 2005 Sampling <br /> -3- <br />