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i <br /> . Report of Findings <br /> Frontier Transportation <br /> 0200-024 <br /> March 3, 2000 <br /> Page 5 <br /> temperature, and conductivity) were measured before, during, and after well purging (See <br /> Appendix D for Groundwater Parameters). Groundwater samples were analyzed for TPH-d, <br /> TPH-g, TPH-m (total petroleum hydrocarbons as motor oil), BTEX, and MTBE using EPA <br />' methods 8015 modified for diesel, 8015 modified for gasoline, SOl 5 modified for motor oil, 8020 <br /> for BTEX, and 8260 to confirm MTBE, respectively. Laboratory analysis results for all <br />' monitoring episodes are presented in Table 1. Groundwater laboratory analytical reports are <br /> included as Appendix E. <br />' Groundwater collected from all monitoring wells identified dissolved TPH-d and TPH-m <br /> concentrations in monitoring well MW-3, exclusively, as 33,000 l.tg/L using EPA method 8015. <br /> All other monitoring wells identified no detectable (<50 p&/L) dissolved TPH-d and TPH-m <br />' concentrations. <br /> In addition, laboratory analysis of groundwater samples identified no detectable <br /> concentrations (<50 µg/L) of dissolved TPH-g in MW-1, MW-2, MW-4, MW-5, MW-6, MW-7< <br /> MW-8, MW-9, MW-10, and MW-1 1 using EPA method 8015 modi#ied. <br /> SGroundwater collected from monitoring well MW-3, exclusively, identified dissolved <br /> TPH-g concentrations as 3,700 µgfL in January 2000. <br />' Monitoring well MW-3 identified no change in dissolved TPH-g concentrations since <br /> November 1999. <br /> TPH-g concentrations attenuated to X50 Ftg/L in MW-1 from 7 10 µg11 identified in <br /> November 1999. No other well identified detectable dissolved petroleum hydrocarbon <br />' concentrations in November 1999. Please see Figure 7 for TPH-g isoconcentration map. <br /> No detectable concentrations of dissolved BTEX were identified in groundwater samples <br />' collected from monitoring wells MW-1, MW-2, MW-4, MW-5, MW-6, MW-7, MW-8, MW-9, <br /> MW-10, and MW-11 using EPA method 8020 in January 2000. <br /> Groundwater analyzed from well MW-3 identified total dissolved BTEX as 571 pg/L in <br /> January 2000, an increase from 496 µg/1 identified in November 1999. No other well identified <br /> detectable dissolved BTEX concentrations in November 1999. <br /> Total dissolved BTEX concentrations in MW-1 attenuated 99% from 1.19 µg/L in <br /> 1 November 1999 to present. <br /> i <br />