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V <br /> benzene, and MTBE isoconcentration maps are presented as Figures 3, 4, <br /> and 5, respectively. <br /> 4.0 CONCLUSIONS <br /> The groundwater samples collected from monitoring well MW-1 contained <br /> 63 parts per billion (ppb) methyl-tertiary-butyl ether (MTBE). The <br /> ground-� atcr samples collected from monitoring well 14W-2 contained <br /> 4.800 ppb TPH-G, 330 ppb benzene, 330 ppb toluene, 250 ppb ethyl <br /> benzene, 720 ppb total xylenes, 5,300 ppb MTBE, 15 ppb tert-amyl- <br /> methyl-ether (TAME), and 900 ppb TBA. The groundwater samples <br /> collected from monitoring well MW-3 contained 1.5 ppb MTBE. <br /> Groundwater samples collected from monitoring well MW-4 contained <br /> 810 ppb TPH-G, 49 ppb benzene, 29 ppb ethyl benzene, 0.93 total xylenes, <br /> 290 ppb MTBE, 22 ppb TAME, and 9 ppb TBA. Groundwater samples <br /> collected from monitoring well MW-5 contained 510 ppb TPH-G, 33 p p b <br /> MTBE, and 25 ppb TBA. No other hydrocarbons were detected above <br /> laboratory reporting limits in any of the groundwater samples collected. <br /> Concentrations of all compounds detected in the groundwater sample <br /> collected from MW-2, and the majority of the compounds detected in <br /> groundwater samples collected from MW-4, increased from the previous <br /> quarter's results. Analytical data from the remaining wells did not show <br /> any clear trends. <br /> 5.0 RECOMMENDATIONS <br /> ASE recommends the subject site remain on a quarterly sampling <br /> schedule. The next scheduled sampling is scheduled for January 2001. <br /> 6.0 REPORT LIMITATIONS <br /> The results presented in this report represent the conditions at the time <br /> of the groundwater sampling, at the specific locations where the <br /> groundwater samples were collected, and for the specific parameters <br /> analyzed by the laboratory. It does not fully characterize the site for <br /> contamination resulting from sources other than the former underground <br /> storage tanks and associated plumbing at the site, or for parameters n o t <br /> analyzed by the laboratory. All of the laboratory work cited in this report <br /> was prepared under the direction of independent CAL-EPA certified <br /> laboratory. The independent laboratory is solely responsible for the <br /> �.. contents and conclusions of the chemical analysis data. <br /> Singh's Unical Service Station Quarterly Report - October 2001 Sampling <br /> -3- <br />