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v.8.7.009. EPA m.a.0.01 <br /> SEN'S SLOPE ESTIMATOR <br /> -2 <br /> 1 <br /> 8 ® n = 29. <br /> ® Slope = -0.1 <br /> units per year. <br /> Mann Kendall <br /> statistic = -165. <br /> a5 Decreasingtrend <br /> co confidencle vel/� <br /> z (two tailed). <br /> Critical value = -139. <br /> 2 <br /> 0 <br /> Feb 1997 May 2002 Aug 2007 <br /> Hollow symbols indicate censored values. <br /> Constituent: Nitrate as N (mg/L) Facility: Austin Road LF Data File: AUSTININ <br /> Date: 9/27/07, 8:59 AM Client: Austin Road LF View: Batch <br /> ERST SOCIATES, INC <br />