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20032 d Quarter Groundwater Report <br /> • Frontier Transportation <br /> August 6, 2003 <br /> Page 5 <br /> i <br /> dissolved MTBE concentration of 19 µg/L in January 2000` Second quarter 2003 groundwater <br />' analysis from MW-9 identified dissolved MTBE at 15 µg/L No detectable concentrations of <br /> other oxygenates were identified from groundwater sample analysis of the monitoring wells <br /> sampled using EPA method 8260 (See Appendix B) See Figure 6 for the recent MTBE <br />' Isoconcentration Map y1y�I,dis tXAPVftl <br /> � <br /> r <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 <br /> identified in eleven of the thirteen monitoring wells dedicated to the site However, the <br />' identification of dissolved MTBE in MW-1 and MW-9 is a possible indicator that lateral <br /> migration of MTBE may be occurring <br /> BE][[ 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 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 J <br /> Cy,e !1� <br /> 1 <br /> 1 <br /> 1 <br /> i� <br /> 1 <br /> 1 <br />