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0 <br />5.4 <br />10.8 <br />16.2 <br />21.6 <br />27 <br />2/7/19 4/15/20 6/23/21 8/30/22 11/7/23 1/14/25 <br />Sen's Slope Estimator <br />MW-7 <br />Constituent: Chloride Analysis Run 7/1/2025 12:41 PM <br />Foothill LF Client: Aptim Data: 061625 Foothill Landfill Database <br />Sanitas™ v.10.0.27 Software licensed to APTIM. EPA <br />mg/Ln = 13 <br />Slope = 1.561 <br />units per year. <br />Mann-Kendall <br />statistic = 59 <br />critical = 39 <br />Increasing trend <br />significant at 98% <br />confidence level <br />(α = 0.01 per <br />tail).