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The null hypothesis was rejected if trends in the monitoring data were significant at alpha= 0.05, <br /> which is the probability of rejecting the null hypothesis of no trend when it is true (i.e. a Type 1 <br /> error). The County uses Sanitas to calculate both the Sen's Slope and the Mann-Kendall test for <br /> trends. <br /> Corral Hollow Landfill D-7 Department of Public Works/Solid Waste <br /> 4th Quarter and Annual 2012 Groundwater Monitoring County of San Joaquin—January 15,2013 <br />