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+� r <br /> Ripona Market <br /> Quarterly Groundwater Sampling Report May 2003 <br /> Page, 2 <br /> Revised Groundwater Elevations <br /> 7/31/2000 7/16/2001 7/19/2002 10/17/2002 1/21/2003 <br /> MW1 4216 3895 3857 38 3836 <br /> MW2 4209 3961 3846 3795 3934 <br /> MW3 4204 3923 3845 3793-3934 <br /> Groundwater was present as an unconfined state at depths of approximately 24 25 to <br /> 24 78 feet below ground surface at the Ripona Market site on May 5, 2003 The <br /> unconfined water table was present approximately 0 1 to 0 7 feet higher than in the <br /> January 20, 2003 monitoring event A hydrograph of the revised groundwater elevations <br /> at the Ripona Market site is presented in Figure 9 <br /> Groundwater flow direction was North 85 East with a gradient of 0 0003 ft/ft The <br /> groundwater elevations and groundwater flow direction are shown on Figure 2 Site Map / <br /> Groundwater Flow <br /> Groundwater Elevations 05-05-03 <br /> Well lCollar Elevation DTW GW Elevation <br /> MW-1 6328 12425 3903 <br /> MW-2 6359 LL24 56 3903 <br /> MW-3 638 12478 13902 <br /> The analytical laboratory reported groundwater contamination by toluene and MTBE in <br /> wells MW-1 and MW-2 MTBE was only detected in well MW-2 located at the edge of <br /> the tank basin Groundwater chemistry for the January 2003 event is presented in Figure <br /> 3 <br /> Laboratoa Groundwater Sam le Results Petroleum Compounds 05-05-03 <br /> Samp le I D Gasoline Benzene Toluene E-Benzene Xylenes MTBE I t-Butanol I TAME I DO <br /> MW-1 <0 05 <0 3 <0 3 05 <06 <0 5 1 <5 <05 NA <br /> MW-2 <0 05= <6 <6 <6 <12 1750 <100 <10 NA <br /> MW-3 <0 05 1 <03 <0 3 <03 <06 <0 5 <5 <05 NA <br /> ND=Non Detect NA=Not Analyzed <br /> Mg/L for gasoline&Dissolved Oxygen pg/L for BTEX,MTBE,and 8260 Oxygenated Compounds <br /> Fuel oxygenates were previously detected in soil samples collected at depths of 25 and 30 <br /> feet in a boring in the vicinity of the former underground storage tanks A survey of <br /> potential contamination plume receptors within 2,000 feet of the point of release <br /> identified water well approximately 2000 feet from the former underground storage tanks <br /> A work plan for the vertical definition of the contamination near MW-2 will be prepared <br /> as directed in San Joaquin County DEH letter dated June 18, 2003 <br />