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e Ripona Market First Quarter Groundwater Sampling Report February 2004 Page 2 i Groundwater flow direction was North 59 East with a gradient of 0 0004 ft/fl similar to past monitoring events The groundwater elevations and groundwater flow direction are shown on Figure 2 Site Map / Groundwater Flow Groundwater Elevations 02/02/04 Well Collar Elevation DTW GW Elevation MW-1 6328 2491 3837 MW-2 6359 2521 3838 MW-3 638 2543 3837 MW-4 6352 2515 3837 The analytical laboratory reported groundwater contamination by MTBE (2070 ug/1) in well MW-2, located at the edge of the tank basin Trace concentrations of gasoline and aromatic compounds were detected in the deep well MW4 MTBE was not detected in well MW4 Groundwater chemistry for the February 2, 2004 event is presented in Figure 3 Laboratory Groundwater Sample Results Petroleum Com ounds 02/02/04 Sample I D j Gasoline Benzene I Toluene I E-Benzene I Xylenes I MTBE I t-Butanol I TAME I DO . MW-1 <0 05 <0 3 <0 3 <0 3 <0 6 <0 5 <5 <0 5 041 MW-2 <0 05 <30 <30 <30 <60 2070 <500 <50 037 MW-3 <0 05 <0 3 <0 3 <0 3 <0 6 <0 5 <5 <0 5 073 MW-4 014 94 42 29 18 <0 5 <5 <0 5 4 19 ND=Non Detect NA=Not Analyzed Mg/L for gasoline&Dissolved Oxygen pg/L for BTEX,MTBE,and 8260 Oxygenated Compounds The lateral and vertical extent of MTBE, the contaminant of concern has been defined laterally and vertically to be restricted to the immediate vicinity of the former underground storage tanks A survey of potential contamination plume receptors within 2,000 feet of the point of release identified water well approximately 2000 feet from the former underground storage tanks It appears that the release does not pose a nsk to the identified water wells in the vicinity of Ripona Market Quarterly monitoring of all wells will continue If the preliminary results of the recent groundwater monitoring are confirmed, an evaluation of the potential long term threat of the impacted groundwater will be conducted and a corrective action plan prepared including recommendations for addition work or site closure