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1 <br /> • Quarterly Groundwater Report <br /> Frontier Transportation <br /> 1199-184 <br /> December 2, 1999 <br /> Page 4 <br /> 6, and MW-7 identified no detectable concentrations of petroleum dissolved hydrocarbons (TPH- <br /> d, TPH-m, TPH-g, BTEX, and MTBE). <br /> BEII 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-g and TPH-d <br /> using EPA method 8015m, and oxygenates using EPA method 8260 in all future monitoring <br /> episodes as directed by the PHS/EHD. In addition, BEII will also perform a subsurface site <br /> investigation to determine the lateral extent of dissolved petroleum hydrocarbons identified in <br /> MW-1 and MW-3. <br /> r <br /> r <br /> r� <br /> r <br /> r <br /> r <br /> r <br /> r <br /> r <br /> r <br /> r <br />