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tertiary butyl ether (MTBE) and no reported concentrations of TPH-G or <br /> benzene, isoconcentration contour maps were not prepared this quarter <br /> 4.0 CONCLUSIONS <br /> • The groundwater sample collected from monitoring well MW-1 <br /> contained 12 ppb MTBE and 69 ppb tert-butonal (TBA) <br /> • The groundwater samples collected from monitoring well MW-2 <br /> contained 22 ppb MTBE <br /> • The groundwater samples collected from monitoring well MW-4 <br /> contained 6 0 ppb MTBE <br /> • The groundwater samples collected from monitoring well MW-5 <br /> contained 11 ppb MTBE and 11 ppb TBA <br /> • No other hydrocarbons were detected above the laboratory method <br /> reporting limits in any of the groundwater samples collected <br /> Hydrocarbon concentrations in the groundwater sample collected from <br /> monitoring well MW-2 decreased drastically in comparison to the previous <br /> quarter The TPH-G and BTEX concentrations dropped to below reporting <br /> limits, while, most notably, MTBE decreased from 1,200 ppb to 22 ppb <br /> Reported concentrations in the remaining wells either remained stable or <br /> decreased this quarter <br /> 5.0 RECOMMENDATIONS <br /> ASE recommends continued quarterly monitoring The next sampling is <br /> scheduled for January 2004 <br /> Additionally, ASE recommends continued operation of the ozone sparging <br /> system <br /> Singh's Unocal Service Station Quarterly Report — October 2003 Sampling <br /> -3- <br />