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Quarterly Groundwater Report <br /> Frontier Transportation <br /> 1100-131 <br /> November 8, 2000 <br /> Page 4 <br />' MW-3. No detectable concentrations of the remaining oxygenates were identified from <br /> groundwater sample analysis of all eleven monitoring wells using EPA method 8260 (See <br />' Appendix B), <br /> 5.0) CONCLUSIONS AND RECOMMENDATIONS <br /> Based on groundwater sample analysis results, the dissolved TPH-d, TPH-g, TPH-m, <br /> BTEX, and MTBE plumes are spatially stable on-site and confined to the former UST location. <br /> No detectable concentrations of dissolved TPH-d, TPH-g, TPH-m, BTEX, and MTBE were <br /> identified in ten of the total eleven monitoring wells dedicated to the site. Dissolved TPH-d, <br /> TPH-g, TPH-m, BTEX, and MTBE were identified in monitoring well MW-3 exclusively located <br /> ' just east of former UST location. Attenuation of the above petroleum hydrocarbons has been <br /> identified in MW-3 since their respective recorded maximums. <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-d, TPH-g and <br /> TPH-m using EPA method 8015m, and oxygenates using EPA method 8260 in all future <br /> monitoring episodes as directed by the PHS/EHD. <br /> 1 <br /> 1 <br />