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Revised Quarterly Monitoring Report – <br />Fourth Quarter/Annual 2024 <br />www.arcadis.com <br />Revised - Forward Landfill 4Q24 Quarterly Mon Report 06262025 9 <br />minimum freeboard observed in the surface impoundments F-North and F-West during fourth quarter 2024 <br />consistently exceeded the minimum requirements specified by the MRP (RWQCB 2024a). <br />Table 4-1 Volume of Leachate During Fourth Quarter 2024 <br />Surface <br />Impoundment <br />Quarterly <br />Pumped <br />Leachate Volume <br />(gallons) <br />Average Pumped <br />Leachate Volume <br />(gallons/day) <br />Minimum Required <br />Freeboard <br />(feet) <br />Minimum <br />Observed <br />Freeboard <br />(feet) <br />WMU-F (F-North) 108,500 1,276.47 4.73 7.00 <br />WMU-F (F-West)a 349,000 4,105.88 5.51 6.67 <br />Note: <br />a FU-19E was inaccessible due to flooding on December 26, 2024. Data for this location are from December 20, 2024. <br /> <br />Leachate may be recirculated at the Site in accordance with the RWQCB-approved Leachate Recirculation Plan <br />(Forward 2017). According to the Forward Landfill Operations Manager, leachate recirculation was performed at <br />the Site during fourth quarter 2024 for dust suppression activities. The Site’s maximum average leakage rate, <br />which was proposed and documented in the 2024 WDRs (RWQCB 2024a), is 14,445 gallons per day. The <br />maximum average leakage rate was not exceeded in fourth quarter 2024 at the Site. <br />The Site has approved the disposal of up to 200,000 gallons per year of landfill gas condensate from the Foothill <br />Landfill located in San Joaquin County. During fourth quarter 2024, the Site did not accept any leachate from the <br />Foothill Landfill. <br />4.2 Leachate Seep Monitoring <br />Leachate seep monitoring is conducted in accordance with MRP Section D.2 (MRP Tables 29 and 30 [RWQCB <br />2024a]). The surface seeps at the Site are inspected weekly. <br />No surface seeps were observed at the Site during the fourth quarter 2024; therefore, no seep samples were <br />collected. <br />4.3 Cannery Waste Land Application Monitoring <br />This section describes the monitoring conducted during fourth quarter of 2024 associated with the cannery waste <br />land application and provides the associated monitoring results. Cannery waste land application monitoring is <br />conducted in accordance with MRP Section D.3 (RWQCB 2024a). <br />The last day cannery waste was applied was October 31, 2023. Waste was not applied in 2024, however, crops <br />that were planted to remove nitrogen were removed in 2024. The sections below summarize the cannery waste <br />land application and crop harvesting. This process will no longer occur now that the land application has ceased. <br />The groundwater monitoring discussed in Section 4.3.2 and 4.3.3 will continue under the post closure <br />requirements listed in the MRP (RWQCB 2024a) or until approval to cease monitoring is granted by the RWQCB.