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v.8.7.009. EPA m.a.0.01 <br /> SEN'S SLOPE ESTIMATOR <br /> AMW- 13 <br /> 80- <br /> n = 64.n = 64. <br /> 6 ® Sloe = -0.274 <br /> units per year. <br /> CID ® Mann Kendall <br /> ® normal approx. _ <br /> z -4.572. <br /> 4 <br /> Decreasingtrend <br /> significanat 99% <br /> z confidence level <br /> two tailed). <br /> critical value = -2.575. <br /> 2 <br /> 0 <br /> Aug 1991 Aug 1999 Aug 2007 <br /> Constituent: Nitrate as N (mg/L) Facility: Austin Road LF Data File: AUSTWIN <br /> Date: 9/27/07, 10:07 AM Client: Austin Road LF View: Batch <br /> HERST OCIATES, INC <br />