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Brendan Kenny Central Valley Regional Water Quality Control Board April 15, 2026 Remediation Systems Operations and Performance Summary CAO Task 9.a indicates that quarterly program updates shall include information on remedial systems during each reporting period. A summary of the Site's GWTS, residential GWTSs, and the facility's landfill GCCS are provided in this Program Update. Additional details regarding the Site's GWTS (submitted by April 30, 2026) and the residential GWTSs (submitted by May 1, 2026) are provided under separate cover in the following reports: • First Quarter 2026 Groundwater Treatment System Monitoring Report; and • First Quarter 2026 Residential Groundwater Treatment Systems Monitoring Report. Groundwater Extraction and Treatment System A GWTS is operated at the Site to address detections of volatile organic compounds (VOCs) in groundwater in accordance with the WDRs outlined in the Order. The California State Water Resources Control Board Monitoring and Reporting Program (MRP)Table 19 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 bi-weekly, as they are the only extraction wells that are part of an operational system. Extraction well CDCR-EW-1 is not currently part of an operational remedial system and therefore is not monitored bi-weekly. Additional offsite extraction wells (CDCR-EW-2, CDCR-EW-3, CDCR-EW-4, and CDCR-EW-5)are not included in the MRP and not connected to an operational remedial system. Due to absence of an operational remedial system at the five offsite extraction wells, the wells are not monitored bi-weekly as part of the corrective action program. The five offsite extraction wells were added to the routine quarterly monitoring program in the second quarter of 2025 and are suggested to be included in the next revision of the MRP. The extracted groundwater is treated by two, 10,000-pound granulated activated carbon (GAC)vessels that were installed in January 2020. During the reporting period, the GWTS was inspected and monitored bi-weekly by Del-Tech Geotechnical Support(Del-Tech)of Oakdale, California. Flow rates from the extraction wells were routinely monitored and adjusted, if needed, to confirm groundwater capture within the treatment area. Del-Tech's field inspection forms are included in Attachment 1. During the first quarter, the GWTS treated approximately 53,799,794 gallons of extracted groundwater, which represents an average total flow rate of approximately 689,741 gallons per day. Based on the extracted volumes and analytical VOC concentrations, the GWTS removed approximately 0.82 pounds of total VOCs during the reporting period. Del-Tech's downtime log for the reporting period is included in Attachment 1. The GWTS was operational throughout the reporting period with no downtime events, which indicates the system was operational for 100 percent of the time (a total of 2,040 hours of system operation between the beginning of the reporting period through the final visit of the quarter on March 26, 2026). Total VOCs (up to 0.63 micrograms per liter of total VOCs)were detected in the six system influent samples collected. No VOCs were detected above the practical quantitation limit in any of the system effluent samples collected at the point of compliance, satisfying the discharge requirements of the Order. www.arcadis.com 2/4 Forward Landfill 1Q26 CAP Update_04.15.2026