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i <br /> 4.0 CONCLUSIONS <br /> • The groundwater sample collected from monitoring well MW- 1 <br /> contained 13 ppb methyl-tertiary-butyl ether (MTBE) and 9 ppb tert- <br /> butonal (TBA) <br /> • The groundwater samples collected from monitoring well MW-2 <br /> contained 520 ppb TPH-G, 15 ppb benzene, 36 ppb ethyl benzene, 4 6 <br /> ppb total xylenes, 1,200 ppb MTBE, 4 9 ppb tert-amyl-methyl-ether <br /> (TAME), and 260 ppb TBA <br /> • The groundwater samples collected from monitoring well MW-4 <br /> contained 15 ppb MTBE <br /> • The groundwater samples collected from monitoring well MW-5 <br /> contained 13 ppb MTBE and 10 ppb TBA <br /> • No other hydrocarbons were detected above the laboratory method <br /> reporting limits in any of the groundwater samples collected <br /> The TPH-G and BTEX concentrations in the water sample collected from <br /> monitoring well MW-2 decreased by an order of magnitude since last <br /> quarter The MTBE, TBA and TAME concentrations were virtually the same <br /> as last quarter For the most part, concentrations in the remaining wells <br /> showed either a stable or decreasing trend in concentrations <br /> 5.0 RECOMMENDATIONS <br /> ASE recommends the subject site remain on a quarterly sampling schedule <br /> The next sampling is scheduled for October 29, 2003 <br /> ASE further recommends that the ozone-sparging system continue to <br /> operate for a period of 6 additional months <br /> i <br /> i <br /> Singh's Unocal Service Station Quarterly Report — July 2003 Sampling <br /> -3- <br />