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Because seasonal variations in analytical data can caused b changes in precipitation <br /> Yt Y <br /> • patterns or groundwater flow, seasonality is evaluated based on whether the direction of <br /> groundwater flow or groundwater elevation varies by season. Based on a review of <br /> groundwater potentiometric surface maps for the site generated for groundwater elevation <br /> data measured in August 2003, November 2003, February 2004 and May 2004, groundwater <br /> flow direction does not change seasonally. At the East Minor site, groundwater elevation has <br /> fluctuated by up to seven feet over the course of the last six years. However, this variation <br /> has been across several years between 1999 and 2005, during which time average <br /> groundwater elevations have increased approximately five feet, whereas typical seasonal <br /> variations are less than two feet. Thus, any trends that might be associated with variation of <br /> water levels are primarily not seasonal in nature. <br /> To further verify that groundwater concentration data is not seasonal, benzene and TPHg <br /> concentration data were compared at each well at which a Mann-Kendall analysis was <br /> performed. A review of these graphs, which include gridlines demarking seasons, <br /> demonstrates how variability of concentrations is not cyclical or seasonal in nature. <br /> To document these data, this appendix includes the following items: <br /> Mann-Kendall test spreadsheets for all wells subjected to the test; <br /> • Graphs of TPHg and benzene concentrations for all wells subjected to the test; and <br /> • Graphs from wells NP-1-22, NP-1-65 and NP-1-111, which depict the variation in <br /> groundwater elevations in each of the three hydrogeologic units at the site. <br />