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Quarterly Groundwater Report <br /> Frontier Transportation <br /> ' 1201-080 <br /> December 20, 2001 <br /> Page 4 <br /> ' 1,889 µg/L identified in August 2001. Total dissolved BTEX concentrations in MW-3 have <br /> attenuated by 99% since the maximum was identified as 8,350 gg/L in March 1998 when <br /> groundwater rose to its shallowest depth recorded (7.V bg). See Figure 5 for the recent <br /> dissolved BTEX Isoconcentration Map. <br /> ' MTBE was identified in groundwater from one monitoring well (MW-3) exclusively in <br /> November 2001. Groundwater collected from monitoring well MW-3 identified an increase in <br /> MTBE concentrations from 1,300 µg/L to 110 µg/L, since the previous monitoring episode <br /> ' (August 2001) using EPA method 8260. MTBE concentrations have attenuated by 99% from <br /> the maximum concentration of 29,400 µg/L identified in MW-3 during March 1998. No <br /> detectable concentrations of other oxygenates were identified from groundwater sample analysis <br /> ' of all eleven monitoring wells using EPA method 8260 (See Appendix B). See Figure 6 for the <br /> recent MTBE Isoconcentration Map. <br /> ' 5.0) CONCLUSIONS AND RECOMMENDATIONS <br /> Based on groundwater sample analysis results, the dissolved TPH-g, BTEX, and MTBE <br /> wplumes are spatially stable on-site and confined to the former UST location. No detectable <br /> concentrations of dissolved TPH-d or TPH-m were identified from all eleven monitoring wells <br /> Dissolved concentrations of TPH-g, BTEX, and MTBE were identified in ten of the eleven <br /> ' monitoring wells dedicated to the site. Dissolved TPH-g, BTEX, and MTBE were identified in <br /> monitoring well MW-3 exclusively located just east of former UST location. Attenuation of the <br /> above petroleum hydrocarbons has been identified in MW-3 since their respective recorded <br /> maximums identified in March 1998. <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 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. In addition, BEII requests that groundwater analysis for <br /> TPH-m will no longer be performed at the site. <br /> 1 <br />