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McDowell & Davis Towing Quarterly Groundwater Sampling Report Page: 2 May 2003 0.17 feet from the January 20, 2003 monitoring event. A groundwater hydrograph is presented in Figure 4. Groundwater Elevations 05-05-03 Well Collar Elevation I DTW GW Elevation MW-1 118.14 63.65 54.49 MW-2 1 118.79 63.29 55.5 MW-3 118.39 63.05 55.34 Groundwater flow was to the southwest (south 50 west) with a shallow gradient (0.015 ft/11). The potentiometric surface and groundwater flow direction are shown on figure 2 Site Map / Groundwater Flow. Gasoline range petroleum hydrocarbons and aromatic compounds were not detected in any of the monitoring wells. MTBE was detected in well MW3 at below water quality concentrations. The dissolved oxygen concentrations show a dramatic drop in well MW 1 indicating increased biologic activity in the area of the former dispenser island. - Laboratorx Groundwater Sample Results 5-5-03 Sample I.D. Gasoline Benzene Toluene E-Benzene Xylenes Oxygenates Oz MW-1 <0.05 <0.3 <0.3 <0.3 <0.6 ND 3.3 MW-2 <0.05 <0.3 <0.3 <0.3 <0.6 ND 6.6 +r MW-3 <0.05 <0.3 <0.3 <0.3 <0.6 0.5 mtbe 6.7 ND=Non Detect NA=Not Analyzed Mg/L for gasoline µg/L for BTEX,MTBE,and 8260 Oxygenated Compounds Volatile aromatic hydrocarbons and petroleum hydrocarbons were not detected in any of the monitoring wells in the May 9, 2003 monitoring event. Previous monitoring events have detected gasoline and gasoline constituents at concentrations that exceeded established water quality goals. Gasoline and gasoline constituents have been detected in soil samples collected at depths of 15 and 25 feet in the vicinity of the former dispenser island. Scheduled quarterly groundwater monitoring will continue.