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v.8.7.009. EPA m.a.0.01 <br /> SEN'S SLOPE ESTIMATOR <br /> g <br /> n = 66. <br /> 6 ® Slope = -0.251 <br /> units per year. <br /> Mann Kendall <br /> ® normal approx. _ <br /> z -4.534. <br /> 4 <br /> Decreasing trend <br /> significant at 99% <br /> z confidence level <br /> two tailed). <br /> 2 Critical value = -2.575. <br /> 40 <br /> 0 <br /> Aug 1991 Nov 1999 Feb 2008 <br /> Constituent: Nitrate as N (mg/L) Facility: Austin Road LF Data File: AUSTININ <br /> Date: 4/10/08, 11:41 AM Client: Austin Road LF View: Batch <br /> HERST & ASSOCIATES, INC.' <br />