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0 <br />10 <br />20 <br />30 <br />40 <br />50 <br />5/14/19 7/1/20 8/19/21 10/7/22 11/25/23 1/13/25 <br />Sen's Slope Estimator <br />MW-4A (bg) <br />Constituent: Calcium,Dissolved Analysis Run 7/1/2025 12:40 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 = -1.73 <br />units per year. <br />Mann-Kendall <br />statistic = -45 <br />critical = -39 <br />Decreasing trend <br />significant at 98% <br />confidence level <br />(α = 0.01 per <br />tail).