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statistical trend. A Wilcoxon rank-sum test comparing the calcium data at background wells MW-6A and MW-7A to the data at MW-10A(a= 0.05) indicates that the calcium data at MW- l0A are statistically distinct from those at the background wells. The Wilcoxon rank sum plot is presented in Appendix E. The presence of stable calcium concentrations at MW-l0A that are statistically distinct from background indicates that the concentration limit exceedance for calcium at MW-10A in the first quarter 2012 is likely due to spatial variation in the natural groundwater geochemistry at the site. The first quarter 2012 chloride concentration at well MW-9B (150 mg/L) is within the range of concentrations observed at MW-9B since the beginning of background in May 2005 (109 mg/L - 180 mg/L). As discussed above, chloride at MW-9B does not exhibit a significant upward statistical trend. A Wilcoxon rank-sum test comparing the chloride data at background wells MW-6A and MW-7A to the data at MW-9B (a=0.05) indicates that the chloride data at MW-913 are statistically distinct from those at the background wells. The Wilcoxon rank sum plot is presented in Appendix E. The presence of stable chloride concentrations at MW-9B that are statistically distinct from background indicates that the concentration limit exceedance for chloride at MW-9B in the first quarter 2012 is likely due to spatial variation in the natural groundwater geochemistry at the site. The first quarter 2012 chloride concentration at well MW-10A (170 mg/L) is within the range of concentrations observed at MW-l0A since the beginning of background in May 2005 (5 3.5 mg/L - 210 mg/L). As discussed above, chloride at MW-l0A does not exhibit a significant upward statistical trend. A Wilcoxon rank-sum test comparing the chloride data at background wells MW-6A and MW-7A to the data at MW-10A (a= 0.05) indicates that the chloride data at MW- l0A are statistically distinct from those at the background wells. The Wilcoxon rank sum plot is presented in Appendix E. The presence of stable chloride concentrations at MW-l0A that are statistically distinct from background indicates that the concentration limit exceedance for chloride at MW-l0A in the first quarter 2012 is likely due to spatial variation in the natural groundwater geochemistry at the site. The first quarter 2012 magnesium concentration at well MW-l0A (94 mg/L) is within the range of concentrations observed at MW-l0A since the beginning of background in May 2005 (23.8 mg/L - 120 mg/L). As discussed above, magnesium at MW-l0A does not exhibit a significant upward statistical trend. A Wilcoxon rank-sum test comparing the magnesium data at background wells MW-6A and MW-7A to the data at MW-l0A (a = 0.05) indicates that the magnesium data at MW-l0A are statistically distinct from those at the background wells. The Wilcoxon rank sum plot is presented in Appendix E. The presence of stable magnesium concentrations at MW-l0A that are statistically distinct from background indicates that the concentration limit exceedance for magnesium at MW-10A in the first quarter 2012 is likely due to spatial variation in the natural groundwater geochemistry at the site. The first quarter 2012 field temperature value at well MW-9B (24.6 °C) is within the range of temperatures observed at MW-9B since the beginning of background in March 1997 (20.0 °C - 28.0°C). As discussed above, field temperature at MW-9B does not exhibit a significant upward statistical trend. A Wilcoxon rank-sum test comparing the field temperature data at background wells MW-6A and MW-7A to the data at MW-9B (a= 0.05) indicates that the field temperature data at MW-9B are statistically distinct from those at the background wells. The Wilcoxon rank sum plot is presented in Appendix E. The presence of stable field temperatures at MW-9B that are statistically distinct from background temperatures indicates that the concentration limit exceedance for field temperature at MW-9B in the first quarter 2012 is likely due to spatial variation in the natural groundwater temperatures at the site. The first quarter 2012 field temperature value at well MW-l0A (25.8 °C) is within the range of temperatures observed at MW-l0A since the beginning of background in March 1997 (13.5 °C -