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Quarterly Monitoring Report— First Quarter 2026 Introduction This report presents water quality monitoring data generated during first quarter 2026 at the Forward, Inc. (Forward) Landfill, located at 9999 South Austin Road in San Joaquin County, California (Site). Arcadis U.S., Inc. (Arcadis) has prepared this report on behalf of Forward. Water quality monitoring was performed in accordance with the Monitoring and Reporting Program (MRP) specified in the Forward Landfill Waste Discharge Requirements (WDRs) set forth in the Central Valley Regional Water Quality Control Board (RWQCB) Order No. R5-2024-0002 (RWQCB 2024). The WDR and MRP Order No. R5-2024-0002 (superseding Order No. R5-2014- 0006 [RWQCB 2014])was finalized on February 16, 2024, and reporting under this MRP began with the second quarter 2024 monitoring report (Arcadis 2024). Detection Monitoring Program Results This section provides the water quality monitoring results for first quarter 2026. Figures 1 through 7 show the various monitoring networks stipulated by the MRP. Each of the following subsections addresses the requirements stated in Section B of the MRP (RWQCB 2024). 2.1 Groundwater Monitoring This section describes the groundwater monitoring network at the Site, monitoring activities completed during first quarter 2026, and monitoring results. Groundwater monitoring is conducted in accordance with MRP Section B.1 (RWQCB 2024). 2.1.1 Monitoring Network The groundwater monitoring network at the Site currently includes 109 groundwater monitoring wells, three domestic wells, and three piezometers (Figure 1). Table 1 summarizes the wells in the groundwater monitoring network along with the well's associated program and construction details. For the dual-nested well pairs, the "B" piezometers are sampled only if the associated "A" well is dry. The groundwater monitoring network in the MRP includes 98 groundwater monitoring wells (including five dual-nested well pairs designated as "A"for shallow and "B"for deep), three domestic wells, and three piezometers (RWQCB 2024). A summary of the MRP discrepancies is provided below: • Groundwater monitoring well AMW-54 was abandoned in first quarter 2025 (Arcadis 2025a) and, therefore, will no longer be sampled. • Eight groundwater monitoring wells were installed after the issuance of the MRP (AMW-54R, AMW-60S, AMW-60M, AMW-61 M, AMW-61 S, AMW-62, AMW-63, and AMW-64) and were added to the groundwater monitoring network. • Four offsite monitoring wells (7833-MW-01 through 7833-MW-04) are monitored quarterly. • Groundwater monitoring well AMW-10 was abandoned in 2018 and is no longer included in the monitoring program (Geo-Logic Associates, 2018). In the Fourth Quarter/Annual Monitoring Report (Arcadis 2026a), www.arcadis.com Forward Landfill 1Q26 QMR 1