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Quarterly Monitoring Report – Third Quarter 2025 <br />www.arcadis.com <br />Forward Landfill 3Q25 Quarterly Mon Report 6 <br />Table 2-1 Surface Water Detection Monitoring Network <br />Monitoring Point Program or Function Location <br />FSW-2 Background (upstream) South fork of Littlejohn’s Creek, operational <br />FSW-1 Downstream South fork of Littlejohn’s Creek, operational <br />ASW-1 Background (upstream) North fork of Littlejohn’s Creek, operational <br />ASW-2 Downstream North fork of Littlejohn’s Creek, operational <br />Samples are collected from each monitoring point if surface water is present during the monitoring event and <br />analyzed as required by MRP Tables 12 and 13 (RWQCB 2024). Supplemental analyses are conducted every 5 <br />years, with the next 5-year analyses planned for third quarter 2028. <br />2.3.2 Quarterly Results <br />Analytical results for the third quarter 2025 surface water monitoring are provided in Table 6. No discharges from <br />the Site into the adjacent creeks were observed during third quarter 2025. <br />Monitoring points ASW-1 and ASW-2 were sampled during third quarter 2025. Surface water samples could not <br />be collected from monitoring points FSW-1 or FSW-2 during third quarter 2025 as the south fork of Little John’s <br />Creek was dry during the initial monitoring and throughout third quarter 2025. Cumulative data for the four surface <br />water monitoring points for the past year (third quarter 2024 through third quarter 2025) are included in Appendix <br />D. <br />3 Corrective Action Monitoring Program <br />This section describes corrective action monitoring conducted during third quarter 2025 and provides the <br />associated monitoring results. Corrective action monitoring is conducted in accordance with MRP Section C <br />(RWQCB 2024). <br />3.1 Groundwater Corrective Action <br />Supplemental monitoring of select wells and leachate sumps is required by Water Code Section 13267 Order for <br />Technical Reports Regarding Acceptance of Hazardous Waste, Forward Landfill, San Joaquin County (RWQCB <br />2017b). <br />As required by MRP Section C.1 and Table 17 (RWQCB 2024), leachate sumps are analyzed for dissolved <br />inorganic constituents and metals semiannually in first and third quarters. <br />As required by MRP Section D.1.e (RWQCB 2024), the supplemental groundwater monitoring also includes <br />quarterly analysis of dissolved inorganic constituents and metals at monitoring wells AMW-1, AMW-2, AMW-4, <br />and AMW-7. The results of these supplemental analyses for third quarter 2025 are presented in Table 7.