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<br />North County Recycling Center & Sanitary Landfill Department of Public Works/Solid Waste <br />First Semiannual 2025 Groundwater Monitoring Report ©2025 COUNTY of San Joaquin. All Rights Reserved <br /> 20 <br />10 HISTORICAL TIME SERIES PLOTS AND STIFF DIAGRAMS <br />Historical Time Series Plots are presented in Appendix I. Constituents not detected are plotted <br />at their respective detection limits and denoted with a hollow marker in the Historical Time Series <br />Plots. Note that Outliers were included in the plots as directed by Regional Board staff. <br />Stiff diagrams are submitted annually with the second semiannual report.