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<br />North County Recycling Center & Sanitary Landfill Public Works/Solid Waste <br />First Semiannual 2024 Groundwater Monitoring 14 ©2024 COUNTY of San Joaquin. All Rights Reserved. <br /> <br />by the monitoring technician while observing the flow meter. Exposed leachate pipes are <br />periodically inspected for damage or leaks. <br />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 and are not included in <br />this report. Previous stiff diagrams showed that wells G-7 and G-10 are generally <br />calcium/sodium/potassium/magnesium-bicarbonate type with fairly equal cation concentrations. <br />Wells G-8, G-9, G-11, and G-13 are generally calcium-bicarbonate type with slightly more <br />calcium than the other cations. Well G-12 is a sodium/potassium-bicarbonate type. Well G-14 is <br />a calcium/magnesium-bicarbonate type. <br />FACILITY MONITORING <br />County staff inspects the landfill and its associated facilities for any needed maintenance and <br />repair, to ensure that all facilities are functioning properly. The facility monitoring program for the <br />NCRC&SL includes regular maintenance, storm response, and site winterization. <br />Routine Maintenance <br />The County performs maintenance at the NCRC&SL, repairing minor damage, such as erosion <br />rills and ponding of water on an as-needed basis. Maintenance monitoring is typically performed, <br />unless there is a need for more frequent maintenance. Maintenance needs are recorded and <br />scheduled for repair as soon as possible. <br />Storm Response <br />Site Winterization. The County prepares a site winterization plan on an annual basis to assist <br />the landfill in responding to winter conditions. <br />Per the winterization plan, the drainage and erosion control measures are installed. <br /> <br />