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Ripona Market Quarterly Groundwater Sampling Report January 2003 Page: 2 • October 2002 monitoring event A hydrograph of the groundwater elevations at the Ripona Market site is presented in Figure 7 �L Groundwater flow direction on January 20, 20032 was North 72 East with a gradient ofl 0 0065 ft/ft The groundwater elevations and groundwater flow direction are shown on Figure 2 Site Map / Groundwater Flow This is a minor shift in groundwater flow and gradient from North 75 East / 0 008 Rift observed in October and similar to previous groundwater flow directions Groundwater Elevations 01-20-03 Well Collar Elevation I DTW GW Elevation MW-1 69 58 12492 4466 MW-2 7001 12425 4576 MW-3 70 12446 14554 The analytical laboratory reported groundwater contamination by toluene and MTBE in wells MW-2 and MW-3 MTBE was only detected in well MW-2 located at the edge of the tank basin Groundwater chemistry for the January 2003 event is presented in Figure 3 MTBE was reported at a concentration of 1590 ug/l in well MW2, an increase of 975 ug/l from the October 2002 monitoring event MTBE distribution for the January 2003 • event is shown in Figure 4 Benzene was reported as not detected at 30 ug/l indicating the presence of low concentrations Toluene was reported at the detection limit wells MW2 and MW3 Benzene distribution for the January 2003 event is shown in Figure 5 Methanol was not detected in any of the wells and does not appear to be present at the site Laboratory Groundwater ample Results Petroleum Compounds 01-20-2003 S le I D I Gasoline Benzene Toluene E-Benzene Xylenes MTBE t-Butanol TAME DO MW-1 <05 <03 05 <03 <06 <05 <5 <05 72 MW-2 <05 <30 <30 <30 <60 1590 <500 1 <50 43 MW-3 <05 <03 1 03 <03 <0 6 1 <0 5 1 <S 1 <0 5 1 62 ND=Non Detect NA=Not Analyzed Mg/L for gasoline&Dissolved Oxygen Vg/L for BTEX,MTBE,and 8260 Oxygenated Compounds Dissolved oxygen measurements were collected as part of the groundwater monitoring in January 2003 An oxygen low is present in well MW-2 indicating that increased biologic activity is occurring in the area of contamination Dissolved oxygen distribution for the January 2003 event is shown in Figure 6 The release appears to be centered on well MW2 with slight down gradient migration toward well MW3 The low concentrations in well MW3 indicate that the plume is localized in the vicinity of the release