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' 2006 1' Quarter Groundwater Report Frontier Transportation, Inc. ' April 28, 2006 Page 5 1 Monitoring well MW-3 was abandoned in May 2002 Replacement well MW-3R ' identified no detectable concentrations of dissolved TPH-d No other detectable concentrations of dissolved TPH-d were identified from laboratory analysts in any of the wells sampled since then, which includes the second quarter 2004 sampling episode Therefore, groundwater sample,m ,sp 01-1 ' analysis for TPH-d has been discontinued at the siteVA ll - , ,n -�,, �I�°a 3�'1S m �1vrrlAt� W zo,rnev� -dA 1,1, �. Historical gro 4dwater monitoring results have identified TPH-g co centrations above ' 1,000 µg/L in MW-17=3 and MW-3R Dissolved TPH-g concentrat ns in MW-1 had attenuated from 1,800 µg/L in August 1996 and remained under 50 µ from January 2000 to ' March 2005 (See Figure 6 for dissolved TPH-g over time in MW-1) um dissolved TPH-g concentrations were identified in March 1998 as 42,000 µg/L in MW-3, wluch was the shallowest recorded groundwater depth in that well Since then, dissolved TPH-g concentrations attenuated ' to a low of 100 µg/L The last groundwater sample collected from MW-3 in April 2002 prior to abandonment detected dissolved TPH-g as 9,750 µg/L The maximum dissolved TPH-g concentration in MW-3R was 3,790 µg/L in October 2002 Since then, the dissolved TPH-g • levels have decreased over time to lower levels Groundwater collected in March 2006 from thirteen (13) monitoring wells identified eight' 11,°G wells with dissolved TPH-g using EPA method 8015 modified Dissolved TPH-g was identified J , at a maximum of 231,000 in MW-21 in revious 17 µg/L p groundwater monitoring events, MW- ' 1, MW-2, MW-3R, MW-9, and MW-17,7W__20 and MW-21 identified dissolved TPH-gas MW-18 identified dissolved TPH-gas for the rst time (since testing in March 2004) at 55 8 µg/L No other wells identified TPH-g concentrations (<50 µg/L) See Table 1 See Figures 6 and 7 I In past sampling events no detectable to trace concentrations (<5 8 µg/L) of dissolved �� BTEX were identified in monitoring wells MW-4, MW-5, MW-6, MW-7, MW-8, MW-9, MW- v I10, MW-11, MW-12 and MW-14 since initial groundwater testing began in each well f�'W �. ' Monitoring wells MW-1 and MW-2 have remained at non-detect to trace levels since at least July $ � of 1999 Monitoring well MW-13 contained 62 µg/L dissolved total BTEX to June 2002 but has remained non-detect since then Newly installed monitoring wells MW-15 through MW-18 identified no detectable concentrations of dissolved total BTEX during the 2004 first and second quarter groundwater monitoring events Only monitoring wells MW-3 and its replacement MW- ,yi 3R contained dissolved BTEX from almost every groundwater sampling episode � 1S i A ha r •