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0 <br />400 <br />800 <br />1200 <br />1600 <br />2000 <br />3/15/15 3/2/17 2/19/19 2/6/21 1/26/23 1/14/25 <br />Sen's Slope Estimator <br />MW-6 <br />Constituent: EC Analysis Run 7/1/2025 12:45 PM <br />Foothill LF Client: Aptim Data: 061625 Foothill Landfill Database <br />Sanitas™ v.10.0.27 Software licensed to APTIM. EPA <br />umhos/cmn = 21 <br />Slope = -3.398 <br />units per year. <br />Mann-Kendall <br />statistic = -91 <br />critical = -78 <br />Decreasing trend <br />significant at 98% <br />confidence level <br />(α = 0.01 per <br />tail).