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Page 4 <br /> Mr Michael Infurna Jr,Senior REHS <br /> August 13, 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 48 ug/1, 13 ug/l, and 8 7 ug/l, respectively 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 to 25 feet below the ground surface Groundwater <br /> was evaluated to flow easterly at an approximate gradient of 3 45 x 10-3 feet per <br /> foot <br /> 1 <br /> Current groundwater monitoring results indicate that relatively high <br /> concentrations of TPHg and BTEX compounds were detected in the MW-2 <br /> groundwater sample TPHg and BTEX compounds were either not detected or <br /> were measured at relatively low concentrations in the samples from monitoring <br /> wells MW-1 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 /> from the upgradient monitoring wells <br /> Closing <br />' PSC 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 October 2001 <br /> PSC 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 />