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Quarterly Monitoring Report— First Quarter 2026 4.1 Leachate Monitoring and Leachate Collection and Removal System Testing This section describes leachate monitoring activities and testing of the leachate collection and removal system (LCRS) during first quarter 2026, along with the associated monitoring results. The LCRS testing is conducted in accordance with MRP Section DA (MRP Tables 25 through 28 [RWQCB 2024]). 4.1.1 Leachate Monitoring Leachate samples are collected quarterly at the Site. The LCRS sump monitoring network in MRP Table 25 includes 22 locations (RWQCB 2024). Of note, locations TS-1 (FU-23) and TS-2 (FU-23) replaced MRP location FU-23, and locations TS-3 (FU-24) and TS-4 (FU-24)were not included in the MRP. These locations (TS-1 through TS-4)were added in fourth quarter 2024. As a result, the LCRS sump monitoring network should have a total of 25 locations, as presented in Table 1 and Figure 4. Additionally, sump D-93/94 for waste management unit (WMU) D-93/94, listed in Table 25 of the MRP, was improperly labeled in the field as D-93/95 and has been labeled as D-93/95 since May 13, 2020 (see location on Figure 4). The appropriate nomenclature has been used since second quarter 2025. Quarterly leachate monitoring includes the field analyses and laboratory analyses specified in MRP Table 27 (RWQCB 2024). Leachate monitoring was conducted on February 10, 2026. Leachate samples from the LCRS sump monitoring network at the Site are also analyzed semiannually for dissolved inorganic constituents and metals, as required by Water Code Section 13267 Order for Technical Reports Regarding Acceptance of Hazardous Waste, Forward Landfill, San Joaquin County (RWQCB 2017b; see Section 3.1). The semiannual laboratory analyses are scheduled for the first and third quarters of the calendar year. The field and laboratory monitoring results for first quarter 2026 are summarized in Table 8. 4.1.2 Leachate Collection and Removal System Testing The LCRS at the Site is tested annually in accordance with MRP Section D.1.a (RWQCB 2024). In addition, an annual inspection of each sump is performed by Del-Tech, which most recently occurred on October 31, November 1, and November 3, 2025. Visual inspections of sumps are also performed weekly by Del-Tech. Documentation of this process is included in Appendix E. LCRS continuity testing consists of injecting a high-concentration tracer dye into the far side of the LCRS and allowing the liquids to migrate through the unit to settle in the low point of the LCRS sump. The non-toxic tracer dye liquids allow migration to the lowest point of the sump. Once the tracer dye has migrated through the system, it can be extracted and detected from the sump extraction pipe, indicating that a conduit is present through the unit. If excessive liquid is backed up into the drainage layer of the LCRS, the tracer dye will take longer to migrate to the sump. The next annual testing of the LCRS at the Site will be conducted during fourth quarter 2026. www.arcadis.com Forward Landfill 1Q26 QMR 8