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Quarterly Monitoring Report— First Quarter 2026 previous WDRs Order No. R5-2014-0006 (RWQCB 2014). The inclusion of this sampling location was a typographical error; therefore, the proposed corrective action is for this location to be removed from the MRP in the next revision. All analytical results for the unsaturated zone lysimeters are presented in Tables 5a and 5c. 3.3 Groundwater Extraction Treatment System The groundwater treatment system (GWTS) at the Site has been operating since 1994 to mitigate VOC impacts in groundwater. The GWTS currently operates in accordance with WDR Order No. R5-2003-0080 (RWQCB 2003). The monitoring and reporting of the extraction wells is in accordance with the WDR and MRP Order No. R5-2024- 0002 (RWQCB 2024). The MRP Table 19 (RWQCB 2024) lists six groundwater extraction wells as part of the GWTS (EW-1, EW-2, EW-3R, EW-4, EW-5, and CDCR-EW-1). Five of the six groundwater extraction wells listed in Table 19 of the MRP (EW-1, EW-2, EW-3R, EW-4, and EW-5) are monitored monthly as they are the only extraction wells that are part of an operational remedial system. Extraction well CDCR-EW-1 is currently not part of an operational remedial system and, therefore, is not monitored monthly. Additional offsite extraction wells (CDCR-EW-2, CDCR-EW-3, CDCR-EW-4, and CDCR-EW-5)are not included in the MRP and are not connected to an operational remedial system and, therefore, historically have not been monitored monthly. However, these five offsite extraction wells were added to the routine quarterly monitoring program in second quarter 2025 and the analytical results for first quarter 2026 are included in Tables 3a and 3b. During first quarter 2026, the GWTS was inspected and monitored bi-weekly by Del-Tech during January, February, and March. Operational details are documented in the Quarterly Corrective Action Progress Report— First Quarter 2026 (Arcadis 2026c) and the Groundwater Treatment System Monitoring Report for first quarter 2026 (Arcadis 2026d). 3.4 Landfill Gas Corrective Action The landfill gas corrective action system is outlined in the MRP, Section CA and Tables 20 through 24 (RWQCB 2024). The results of landfill gas monitoring of the landfill gas collection and control system, onsite structures, and perimeter gas probes conducted at the Site during first quarter 2026 are presented in the Quarterly Corrective Action Progress Report—First Quarter 2026 (Arcadis 2026c). In accordance with the Cleanup and Abatement Order (R5-2017-0703; RWQCB 2017a) and based on exceedances measured during the year, samples were collected on February 9 and March 3, 2026, for laboratory testing by USEPA Method TO-15. VOC detection results are presented in the Quarterly Corrective Action Progress Report— First Quarter 2026 (Arcadis 2026c). According to Geosyntec Consultants, the landfill gas collection and control system operated continuously with minimal downtime during first quarter 2026 (Arcadis 2026c). 4 Additional Facility Monitoring This section describes additional facility monitoring of leachate, seeps, cannery waste land application, and the Site. Additional facility monitoring is conducted in accordance with MRP Section D (RWQCB 2024). www.arcadis.com Forward Landfill 1Q26 QMR 7