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Quarterly Groundwater Monitoring Report <br /> Frontier Transportation <br /> 4899-139 <br /> August 13, 1999 <br /> increase in MTBE concentrations in MW-1 located downgradient of the former USTs supports <br /> lateral migration of MTBE to the west. <br /> BEII recommends that additional groundwater monitoring wells be installed to determine <br /> the lateral extent of dissolved MTBE to the west and south. A soil gas survey may need to be <br /> conducted should the lateral extent of MTBE extend to the property boundaries. In addition, <br /> BEII recommends that quarterly groundwater monitoring continue at the site until constant or <br /> decreasing dissolved petroleum hydrocarbon concentrations are observed. Groundwater samples <br /> will be analyzed for BTEX using EPA method 8020, TPH-g and TPH-d using EPA method <br /> 8015m, and oxygenates using EPA method 8260 in all future monitoring episodes as directed by <br /> the PHS/EHD. <br />