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Quarterly Monitoring Report— First Quarter 2026 ProgramMonitoring Point ASW-1 Background (upstream) North fork of Littlejohn's Creek, operational ASW-2 Downstream North fork of Littlejohn's Creek, operational Samples are collected from each monitoring point if surface water is present during the monitoring event and analyzed as required by MRP Tables 12 and 13 (RWQCB 2024). Supplemental analyses are conducted every 5 years, with the next 5-year analyses planned for third quarter 2028. 2.3.2 Quarterly Kesults Analytical results for the first quarter 2026 surface water monitoring are provided in Table 6. No discharges from the Site into the adjacent creeks were observed during first quarter 2026. Monitoring points ASW-1 and ASW-2 were sampled during first quarter 2026. Surface water samples could not be collected from monitoring points FSW-1 or FSW-2 during first quarter 2026 as the south fork of Little John's Creek was dry during the initial monitoring and throughout first quarter 2026. Cumulative data for the four surface water monitoring points for the past year(first quarter 2025 through first quarter 2026) are included in Appendix D. Corrective Action Monitoring Program This section describes corrective action monitoring conducted during first quarter 2026 and provides the associated monitoring results. Corrective action monitoring is conducted in accordance with MRP Section C (RWQCB 2024). 3.1 Groundwater Corrective Action Supplemental monitoring of select wells and leachate sumps is required by Water Code Section 13267 Order for Technical Reports Regarding Acceptance of Hazardous Waste, Forward Landfill, San Joaquin County (RWQCB 2017b). As required by MRP Section C.1 and Table 17 (RWQCB 2024), leachate sumps are analyzed for dissolved inorganic constituents and metals semiannually in first and third quarters. As required by MRP Section D.1.e (RWQCB 2024), the supplemental groundwater monitoring also includes quarterly analysis of dissolved inorganic constituents and metals at monitoring wells AMW-1, AMW-2, AMW-4, and AMW-7. The results of these supplemental analyses for first quarter 2026 are presented in Table 7. 3.2 Unsaturated Zone Corrective Action The MRP, Section C.2 and Table 18 (RWQCB 2024), requires additional analysis of dissolved inorganic constituents and metals for unsaturated zone lysimeters FU-04, FU-05, FU-06, and FU-10 semiannually (first and third quarters). Lysimeter FU-10 is listed in the MRP's Unsaturated Zone Corrective Action Monitoring Table (MRP Table 18 [RWQCB 20224]); however, no historical data exist for this location, and it is not included in the www.arcadis.com Forward Landfill 1Q26 QMR 6