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Detection Techniques for use in Water Quality Monitoring Programs," Jim C. Loftis, et al. <br /> (USEPA), 1989. <br /> For the Harney Lane Sanitary Landfill, the null hypothesis is "no statistically significant <br /> trend in constituent concentrations." The null hypothesis is rejected if trends in the data are <br /> significant at alpha = 0.05, which is the probability of rejecting the null hypothesis of no <br /> trend when it is true (i.e., a Type 1 error). San Joaquin County uses GSAS to calculate both <br /> the Sen's SIope and the Mann-Kendall test for trends. <br /> I <br /> 1 <br /> i <br /> 1 <br /> i <br />