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Quarterly Groundwater Monitoring Report <br /> Frontier Transportation <br /> 0399-085 <br /> April 5, 1999 <br /> ' BEII recommends that quarterly groundwater monitoring continue at the site until <br /> constant or decreasing dissolved petroleum hydrocarbon concentrations are observed. Should <br /> dissolved petroleum hydrocarbons identify a constant decrease for the next three quarterly <br /> ' monitoring episodes, then a request for closure will be submitted to the PHS/EHD. Groundwater <br /> samples will be analyzed for BTEX using EPA method 8020, TPH-g and TPH-d using EPA <br /> method 8015m, and oxygenates using EPA method 8260 in all future monitoring episodes as <br /> directed by the PHS/EHD. In addition, BEII concludes that a vacuum drawdown not be <br /> Performed as recommended in the previous Quarterly Groundwater Monitoring Report. BEII will <br /> also submit results from a survey of domestic, municipal, agricultural, industrial and any other <br /> wells within a 2,000-foot radius conducted at the site. <br /> r <br /> r <br /> 4 <br /> I <br /> 1 <br />