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S E C O R <br /> • SPH removal activities are typically performed between quarterly monitoring events (as noted <br /> on the table), and are likely to influence reported SPH thickness. <br /> 4.5.1.2 Fuel Oxygenates and Petroleum Hydrocarbon Concentrations <br /> A summary of first quarter 2008 shallow zone concentration trends of TPHg, TPHd, TPHo, <br /> benzene, MtBE, and TBA in comparison to results reported during the fourth quarter 2007 are <br /> presented in the table below. Shallow zone wells MW-18, MW-20, and MW-21 were not <br /> sampled during the third and fourth quarters 2007 due to renegotiations of the off site access <br /> agreements with the property owners and could not be compared to previous quarter data. <br /> Values in parentheses represent number of detections and non-detects that were reported in <br /> the fourth quarter 2007. <br /> • <br /> 1 Q08QSSRQRSRQMR.Final.doc 22 April 30,2008 <br /> 77TW.26397.42.1307 <br />