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1 <br /> Report of Findings <br />' Frontier Transportation <br /> 0200-024 <br /> March 3, 2000 <br /> Page 7 <br />' concentrations of TPH-d, TPH-m, TPH-g, and BTEX are localized near MW-3 only and <br /> contained on the site. <br />' Groundwater sample analysis for MTBE, however, identified evidence of lateral migration <br /> of dissolved MTBE to the west: Monitoring well MW-3 located near the former USTs identified <br /> dissolved MTBE as 90 µg/L. Dissolved MTBE was also identified in downgradient monitoring <br /> wells MW-1 and MW-9 at 170 µg/L and 19 µg/L, respectively. The detection of dissolved <br /> MTBE in monitoring well MW-9 located approximately 140' west of MW-3 indicates that MTBE <br /> imay be migrating to the west. <br /> 6.0) RECOMMENDATIONS <br /> BEII recommends that shallow soil excavation <br /> int that may act <br /> as a to <br /> bg source due to around <br /> the ring <br />' B-6 to remove impacted soil. The impacted so groundwater monitoring continue at <br /> shallow groundwater. BF-11 also recommends that quarterly b <br /> the site until constant or decreasing dissolved petroleum hydrocarbon concentrations are <br /> observed. it is also proposed that groundwater sampling continue for BTEX using EPA method <br /> 8020, TPH-g and g <br /> TPH-d using EPA method 8015m, and oxygenates using EPA method 8260 in <br /> all future monitoring episodes as directed by the PHS/EHD. Should future groundwater <br /> monitoring episodes identify an increase in dissolved MTBE concentrations in monitoring wells <br />' MW-1, MW-3, or MW-9, then groundwater drawdown is recommended in those wells to contain <br /> the plume on site. <br /> 1 <br />