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Acculab's oxygenate detection limits were too high to be of significant value in the <br /> samples collected from MW-1, SP-1, PZ-1, and PZ-2 because of gasoline <br /> interference With the exception of two previous detections of DIPS, oxygenates have <br /> not been measured in MW-1 samples using more appropriate limits For future <br /> monitoring events, Philip will instruct the laboratory to implement sample dilution to <br /> obtain the lowest possible detection limits for oxygenate compounds <br /> There is conflicting data that would indicate whether the magnitude of groundwater <br /> impact is decreasing Although the current benzene concentration in the sample from <br /> MW-1 fluctuated higher than those measured during the two previous rounds of <br /> monitoring, historic petroleum concentrations in samples collected from this well and <br /> PZ-2 show significant decreases over time The relatively higher petroleum <br /> ' concentrations measured during this round, in the sample collected from PZ-1, are <br /> similar to those measured 1n October 1994 This data would suggest that, while the <br /> overall magnitude of impact is decreasing, the rate of reduction might be less than <br /> previously estimated Philip recommends that another round of monitoring be <br /> performed to determine if the results of this third quarter 1999 monitoring were <br /> anomalous Philip's next round of quarterly groundwater monitoring 1s tentatively <br /> scheduled for November 1999 <br /> i <br /> 1 <br /> S <br /> 1 <br /> t <br /> i <br /> ,o <br /> August 1999 Groundwater Monitoring Report Prepared for THE EARTHGRAINS COMPANY Prepared by Philip Services Corp <br /> E\624001321121392EG46240014510899MON DOC October 8, 1999 <br />