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Page 4 Mr Michael Infurna Jr,Senior REHS November 7,2000 xylenes concentrations in the current MW-2 sample show similar fluctuations compared to historic results Petroleum hydrocarbons were not detected in the third quarter 2000 samples collected from upgradient monitoring wells MW-1 and MW-3 Similarly, groundwater samples collected from these wells in July 1999 did not contain detectable petroleum compounds Petroleum compounds were detected in samples from these wells during the second quarter 2000 monitoring However, the detection of petroleum hydrocarbons in upgradient wells during the second quarter of 2000 may have been an anomalous occurrence Three oxygenate compounds were measured during this recent monitoring event The groundwater sample collected from well MW-2 contained TBA, MTBE, and DIPE at concentrations of 180 ug/l, 20 ug/l, and 7 5 ug/l, respectively Oxygenate compounds were not detected in the samples collected from upgradient wells MW-1 and MW-3 Petroleum hydrocarbon concentrations are summarized in Table 2 Benzene and ` TPHg groundwater sample results are illustrated in Figure 4 and Figure 5, respectively Acculabs reports are contained in Attachment 3 Conclusions Based on current monitoring data, groundwater was measured in the monitoring wells at a depth of about 24 feet below the ground surface` Groundwater was evaluated to flow southeasterly at an approximate gradient of 6 97 x 10-3 feet per foot Current groundwater monitoring results indicate that concentrations of TPHg and BTEX compounds were detected in the MW-2 groundwater sample TPHg and BTEX compounds were not detected in samples from upgradient monitonng wells The extent of petroleum hydrocarbon impact can not be delineated at this time TBA, MTBE, and DIPE were detected in the most recent sample collected from well MW-2 These oxygenate compounds were not detected in samples collected from upgradient monitoring wells