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v.8.7.009. EPA m.a.0.01 <br /> SEWS SLOPE ESTIMATOR <br /> 10 <br /> 40 ® n <br /> 8 = 20. <br /> Slope = -1.587 <br /> units per year. <br /> Mann Kendall <br /> �- 6 statistic =-97. <br /> Decreasing trend <br /> significant at 99% <br /> confidence level <br /> 4 (two tailed). <br /> Critical value = -81. <br /> 20- <br /> 0 <br /> Mar 2004 Oct 2006 May 2009 <br /> Constituent: Sulfate as SO4 (mg/L) Facility: Austin Road LFData File: AUSTININFLAG <br /> Date: 6/12/09, 11:57 AM Client: Austin Road LF View: Batch <br /> ERST & ASSOCIATES, INC <br />