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Page 4 <br /> Mr Michael Infurna Jr, Senior REHS <br /> 1 May 11,2001 <br /> Three oxygenate compounds were measured during this recent monitoring event <br /> The groundwater sample collected from well MW-2 contained TBA, MTBE, and <br /> DIPE at concentrations of 45 ug/l, 6 6 ug/l, and 7 1 ug/l, respectively These <br />' current concentrations appear to be lower than historic levels Oxygenate <br /> compounds were not detected in the samples collected from wells MW-1 and <br /> MW-3 <br /> Conclusions <br /> Based on current monitoring data, groundwater was measured in the monitoring <br /> wells at a depth of about 24 feet below the ground surface Groundwater was <br /> evaluated to flow easterly at an approximate gradient of 2 17 x 10-3 feet per foot <br /> Current groundwater monitoring results indicate that concentrations of TPHg and <br />' BTEX compounds were detected in the MW-2 groundwater sample TPHg and <br /> BTEX compounds were not detected in the samples from monitoring wells MW-1 <br /> and MW-3 <br /> TBA, MTBE, and DIPE were detected in the most recent sample collected from <br /> well MW-2 These oxygenate compounds were not detected in samples collected <br /> 1 from the upgradient monitoring wells <br /> Closing <br /> Philip intends to continue quarterly groundwater monitoring at the subject site, <br /> unless otherwise directed by San Joaquin County The next scheduled round of <br /> monitoring will be performed in July 2001 <br />' Philip appreciates the cooperation offered by San Joaquin County for this UST <br /> project If you have any questions concerning this report,please call me at 618- <br /> 281-1547 <br />