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5 <br /> fl � <br /> Ripona Market <br /> Second Quarter Groundwater Sampling Report <br /> Page: 2 May 2004 <br /> • <br /> Groundwater flow direction was to the east with a very shallow gradient (North 59 East / <br /> 0 0002) similar to past monitoring events The groundwater elevations and groundwater <br /> flow direction are shown on Figure 2 Site Map/Groundwater Flow <br /> Groundwater Elevations 05-05-04 <br /> Well Collar Elevation DTW GW Elevation <br /> MW-1 63 28 26 27 37 01 <br /> MW-2 6359 12657 3702 <br /> MW-3 638 12679 37 01 <br /> MW-4 16352 12652 137 <br /> The analytical laboratory reported groundwater contamination by gasoline and aromatic <br /> hydrocarbons in wells MWl and the deep well, MW4 and MTBE in well MW-2, located <br /> at the edge of the tank basin Groundwater chemistry for the August 4, 2003 event is <br /> presented in Figure 3 <br /> Laboratory Groundwater Sample Results Petroleum Compounds 05/05/04 <br /> S le I D Gasoline Benzene Toluene E-Benzene Xylenes MTBE t-Butanol 1,2DCA DO <br /> Mw-1 0 50 30 74 95 45 <0 5 <5 33 54 <br /> M MW-2 <0 05 <3 p <3 0 <3 0 <6 0 1210 129 <5 0 057 <br /> MW-3 <0 05 <0 3 <0 3 <0 3 <0 6 <0 5 <5 <0 5 2 80 <br /> Mw-4 0 08 1 2 9 7 1 5 74 <0 5 <5 <0 5 7 01 <br /> ND=Non Detect NA=Not Analyzed <br /> Mg/L for gasoline&Dissolved Oxygen µg/L for BTEX,MTBE,and 8260 Oxygenated Compounds <br /> The lateral and vertical extent of MTBE, the contaminant of concern has been defined <br /> laterally and vertically to be restricted to the immediate vicinity of the former <br /> underground storage tanks A survey of potential contamination plume receptors within <br /> 2,000 feet of the point of release identified water well approximately 2000 feet from the <br /> former underground storage tanks It appears that the release does not pose a risk to the <br /> identified water wells in the vicinity of Ripona Market Quarterly monitoring of all wells <br /> will continue If the preliminary results of the recent groundwater monitoring are <br /> confirmed, an evaluation of the potential long term threat of the impacted groundwater <br /> will be conducted and a corrective action plan prepared including recommendations for <br /> addition work or site closure <br />