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. included as Appendix B TPH-G, benzene, and MTBE isoconcentration m a p s <br /> are presented as Figures 3, 4, and 5, respectively <br /> 4.0 CONCLUSIONS <br /> The groundwater samples collected from monitoring well MW-1 contained <br /> 13 parts per billion (ppb) methyl-tertiary-butyl ether (MTBE) The <br /> groundwater samples collected from monitoring well MW-2 contained 11 <br /> ppb benzene, 44 ppb ethyl benzene, 840 ppb MTBE, 35 ppb tert-amyl- <br /> methyl-ether (TAME), and 130 ppb tert-butonal (TBA) Hexavalent <br /> chromium was not detected above laboratory detection limits in the <br /> groundwater samples collected from monitoring well MW-2 Groundwater <br /> samples collected from monitoring well MW-4 contained 59 ppb MTBE <br /> Groundwater samples collected from monitoring well MW-5 contained 97 <br /> ppb TPH-G, 19 ppb MTBE and 21 ppb TBA No other hydrocarbons were <br /> detected above laboratory reporting limits in any of the groundwater <br /> samples collected <br /> The hydrocarbon and oxygenate concentrations detected in the <br /> groundwater samples collected from monitoring wells MW-1 and MW-2 <br /> continue to show a decreasing trend Concentrations of all compounds <br /> detected in groundwater samples collected from all other monitoring wells <br /> are consistent with previous results All the compounds analyzed in <br /> monitoring wells MW-3 and MW-6 were below laboratory detection limits <br /> The only compound detected in monitoring wells MWA and MW-4 was <br /> MTBE <br /> 5.0 RECOMMENDATIONS <br /> ASE recommends the subject site remain on a quarterly sampling schedule <br /> The next sampling is scheduled for January 30, 2003 <br /> • <br /> Singh's Unocal Service Station Quarterly Report - October Sampling <br /> -3- <br />