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Report: Groundwater-quality Monitoring—March 29-31,2006, 7500 West Eleventh Street, Tracy, CA Page 22 <br /> P 9 <br /> variations in groundwater elevation in that well on the days samples were recovered. The <br /> fluctuations in the concentrations of TPHd in response to the rise and fall of the <br /> groundwater table is clearly seen and demonstrates that, at the Navarra Site, the <br /> occurrences of the high concentrations of TPHd occur at the opposite season to those that <br /> would be assumed based on weather patterns alone. <br /> Given the characteristics of seasonal variations on concentrations of analytes of concern <br /> l= described above, it is evident that, to provide for a conservative assessment of the degree <br /> to which natural attenuation processes have remediated groundwater beneath the 7500 <br /> West Eleventh Street Site, rounds of groundwater-quality monitoring conducted at an <br /> annual frequency should be undertaken in July of each year. <br /> rr '� <br /> t <br /> 1 <br /> sic <br />