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Ile 20033rdQuarter Groundwater Report <br /> Frontier Transportation <br />' November 14, 2003 <br /> Page 5 <br /> method 8260 (See Appendix B) See Figure 6 for the recent MTBE Isoconcentration Map <br /> 5.0} CONCLUSIONS AND RECOMMENDATIONS <br /> Based on groundwater sample analysis results, the dissolved TPH-g and BTEX plumes <br /> appear to be localized near the former UST locations No detectable to low level concentrations <br />' (below Maximum ContarninnaaLevels) of dissolved TPH-d, TPH-g, BTEX, and MTBE were <br /> identified in eleven of the th n monitoring wells dedicated to the site However, the <br /> identification of dissolved MTBE to MW-1 and MW-14 is a possible indicator that lateral <br />' migration of MTBE may be occurring <br /> BEE recommends that quarterly groundwater monitoring continue at the site until <br /> constant or decreasing dissolved petroleum hydrocarbon concentrations are observed <br /> Groundwater samples will be analyzed for BTEX using EPA method 8020, TPH-d and TPH-g <br /> using EPA method 8015m, and oxygenates using EPA method 8260 in all future monitoring <br />' episodes as directed by the PHS/EHD <br /> 1� <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> i <br /> 1 <br />