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0 <br />40 <br />80 <br />120 <br />160 <br />200 <br />1/28/15 1/24/17 1/22/19 1/19/21 1/17/23 1/14/25 <br />Sen's Slope Estimator <br />MW-6 <br />Constituent: Bicarbonate Alkalinity as CaCO3 Analysis Run 7/1/2025 12:39 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 = 25 <br />Slope = 0 <br />units per year. <br />Mann-Kendall <br />statistic = -105 <br />critical = -101 <br />Decreasing trend <br />significant at 98% <br />confidence level <br />(α = 0.01 per <br />tail).