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0 <br />4 <br />8 <br />12 <br />16 <br />20 <br />1/19/15 1/17/17 1/17/19 1/15/21 1/15/23 1/14/25 <br />Sen's Slope Estimator <br />MW-1A <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 = 21 <br />Slope = -0.2701 <br />units per year. <br />Mann-Kendall <br />statistic = -123 <br />critical = -78 <br />Decreasing trend <br />significant at 98% <br />confidence level <br />(α = 0.01 per <br />tail).