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i <br /> 2003 4"' Quarter Groundwater Report <br /> . Frontier Transportation <br /> February 11, 2004 <br /> Page 5 <br /> March 1998 Fourth quarter 2003 groundwater analysis for replacement well MW-3R identified <br /> a new maximum dissolved MTBE concentration as 6,000 µg/L in December 2003 The fourth <br /> quarter 2003 groundwater sampling also identified dissolved MTBE in MW-4 and MW-14 at 1 1 <br /> p.g/L and d 7 µg/L, respectively No detectable concentrations of other oxygenates were <br /> identified from groundwater sample analysis of the other ten monitoring wells sampled using <br /> EPA method 8250 (See Appendix B) See Figure 6 for the recent MTBE Isoconcentratxon Map <br /> 5 0 CONCLUSIONS AND RECOMMENDATIONS <br /> Based on groundwater sample analysis results, the dissolved TPH-g and BTEX plumes <br /> appear to be localized near the former UST locations No detectable to low level concentrations <br /> (below Maximum Contaminant Levels) of dissolved TPH-d, TPH-g, BTEX, and MTBE were —? A0> <br /> identified in twelve of the fourteen monitoring wells dedicated to the site However, the �L <br /> LTA o� <br /> identification of dissolved YCiay Mmng MW-1 <br /> 1, MW-4 and MW-14 is a possible indicator that y,a1s11 <br /> lateral migration of MTBE ���rs a4�! <br /> r� �A g s j <br /> BEH recommends that quarterly groundwater monitoring continue at the site until ��e 001W <br /> constant or decreasing dissolved petroleum hydrocarbon concentrations are observed ,4)0 <br />' Groundwater samples will be analyzed for BTEX using EPA method 8020, TPH-d and TPH-g <br /> using EPA method 8015m, and oxygenates using EPA method 8260 in all future monitoring <br />' episodes as directed by the PHS/EHD <br /> 1 <br /> 1 <br />