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Quarterly Monitoring Report— First Quarter 2026 4.1.3 Leachate and Surface Impoundment Monitoring Leachate from the sumps at the Site are pumped to surface impoundment WMU-F (F-North) and WMU-F (F- West)for evaporation. The locations of the surface impoundments are shown on Figure 4. During first quarter 2026, leachate was observed in WMU D-88, WMU D-93/94, WMU D-01, WMU D-02, WMU FU-03, WMU FU-04, WMU FU-05, WMU FU-06, WMU FU-19, WMU FU-23, WMU FU-24, and surface impoundments F-North and F-West. D-89 was unable to be sampled due to flooding around the riser, impeding access. Sampling details are discussed in Section 4.1.1 and results are presented in Table 8. The volume of leachate pumped to each surface impoundment during first quarter 2026 is documented in Appendix E and summarized in Table 4-1 below (as required by MRP Table 26 [RWQCB 2024]). The freeboard in the surface impoundments was measured weekly; the freeboard logs are also included in Appendix E. The minimum freeboard observed in first quarter 2026 was 2.4 feet in F-North and 8.0 feet in F-West. Table 4-1 Volume of Leachate During Third Quarter 2025 Quarterly ImpoundmentSurface (gallons) . (gallons/day) WMU-F (F-North) 147,200 1,911.69 14,445 WMU-F (F-West) 228,700 2,970.13 Leachate may be recirculated at the Site in accordance with the RWQCB-approved Leachate Recirculation Plan (Forward 2017). According to the Forward Landfill Operations Manager, leachate recirculation was not performed at the Site during first quarter 2026. The Site's maximum average leakage rate, which was proposed and documented in the 2024 WDRs (RWQCB 2024), is 14,445 gallons per day. The maximum average leakage rate was not exceeded at the Site in first quarter 2026. The Site has approved the disposal of up to 200,000 gallons per year of landfill gas condensate from the Foothill Landfill located in San Joaquin County. During first quarter 2026, the Site did not accept any leachate from the Foothill Landfill. 4.2 Leachate Seep Monitoring Leachate seep monitoring is conducted in accordance with MRP Section D.2 (MRP Tables 29 and 30 [RWQCB 2024]). The surface seeps at the Site are inspected weekly. No surface seeps were observed at the Site during first quarter 2026; therefore, no seep samples were collected. 4.3 Cannery Waste Land Application Monitoring This section describes the monitoring conducted during first quarter of 2026 associated with the cannery waste land application and provides the associated monitoring results. Cannery waste land application area (CWLAA) monitoring is conducted in accordance with MRP Section D.3 (RWQCB 2024). www.arcadis.com Forward Landfill 1Q26 QMR 9