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r <br /> I <br /> I <br /> I <br /> ` benzene, and MTBE isoconcentration maps are presented as Figures 3, 4, <br /> ®� and 5, respectively. <br /> i <br /> 4.0 CONCLUSIONS E <br /> The groundwater samples collected from monitoring well MW-1 contained j <br /> 90 parts per billion (ppb) TPH-G, 0.74 ppb benzene, 290 ppb methyl- <br /> tertiary-butyl ether (MTBE), and 13 ppb tert-butanol (TBA). The <br /> groundwater samples collected from monitoring well MW-2 contained <br /> 1,500 ppb TPH-G, 250 ppb benzene, 7.0 ppb toluene, 82 ppb ethyl <br /> benzene, 18 ppb total xylenes, 1,900 ppb MTBE, 8.3 ppb tert-amyl-methyl- <br /> ether (TAME), and 250 ppb TBA. Groundwater samples collected from <br /> monitoring well MW-3 contained 1.4 ppb MTBE. Groundwater samples <br /> collected from monitoring well MW-4 contained 290 ppb TPH-G, 31 ppb <br /> benzene, 6.4 ppb ethyl benzene, 3.4 total xylenes, 260 ppb MTBE, 14 ppb <br /> R <br /> TAME, and 24 ppb TBA. Groundwater samples collected from monitoring <br /> well MW-5 contained 920 ppb TPH-G, 3.8 ppb ethylbenzene, 66 ppb MTBE, <br /> and 79 ppb TBA. No other hydrocarbons were detected above laboratory <br /> reporting limits in any of the groundwater samples collected. <br /> TPH-G and BTEX concentrations observed in monitoring well MW-2 have <br /> shown a decreasing trend since October 2000. The remaining j <br /> groundwater analytical data from the remaining wells at the site did not k <br /> show any clear trends. <br /> 5.0 RECOMMENDATIONS <br /> I <br /> ASE recommends the subject site remain on a quarterly sampling I! <br /> schedule. The next scheduled sampling is scheduled for August 2001. <br /> A workplan to conduct additional activities was recently prepared. ASE <br /> anticipates implementing work outlined in the workplan during the next <br /> quarter. <br /> a <br /> Singh's Unical Service Station Quarterly Report - May 2001 Sampling <br /> -3- <br />