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Ripona Market <br /> Quarterly Groundwater Sampling Report August 2003 <br /> Page: 2 <br /> Groundwater flow direction was South 82 East with a gradient of 0 0005 ft/ft similar to <br /> past monitoring events The groundwater elevations and groundwater flow direction are <br /> shown on Figure 2 Site Map/ Groundwater Flow <br /> Groundwater Elevations 08-04-03 <br /> Well Collar Elevation DTW 11 GW Elevation <br /> MW-1 6328 26 3728 <br /> MW-2 6359 12631 3728 <br /> MW-3 638 12655 13725 <br /> The analytical laboratory reported groundwater contamination by MTBE (2250 ug/1) in <br /> well MW-2, located at the edge of the tank basin Groundwater chemistry for the August <br /> 4, 2003 event is presented in Figure 3 <br /> Laboratory Groundwater Sam le Results Petroleum Compounds 08-04-03 <br /> Sample I D Gasoline Benzene Toluene E-Benzene Xylenes MTBE t-Butanol TAME DO <br /> MW-1 <0 05 <0 3 <03 <03 <06 <0 5 <5 <O 5 NA <br /> MW-2 <0 05 <6 <6 <6 <12 2250 <100 <10 NA <br /> MW-3 <0 05 <0 3 <03 <0 3 <06 <0 5 <5 <0 5 NA <br /> ND=Non Detect NA=Not Analyzed <br /> . Mg/L for gasoline&Dissolved Oxygen µg/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 has been <br /> approved by San Joaquin County DEH and is scheduled for implementation in September <br /> 2003 <br />