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Quarterly Monitoring Report— First Quarter 2026 <br /> • During the March 23, 2026 inspection, no NOVs were noted. SJCEHD noted one area of concern regarding <br /> erosion channels observed on WMU-08 and surrounding area. Corrective actions were completed and noted <br /> in the inspection report. <br /> 4.4.3 Compost Facility Monitoring <br /> A compost facility exists onsite and was previously permitted under the previous WDR Order R5-2014-0006 <br /> (RWQCB 2014). The compost facility is now regulated under State Water Resources Control Board Order WQ <br /> 2020-0012-DWQ-R5S013, General Waste Discharge Requirements for Commercial Composting Operations <br /> (California Water Boards 2020). As a requirement of Order WQ 2020-0012-DWQ-R5S013, an annual monitoring <br /> and maintenance report for 2025 was submitted on April 1, 2026 (Arcadis 2026b). <br /> According to the Forward Landfill Operations Manager, the compost facility received 27,138.98 tons of green <br /> waste and produced 10,661.99 tons of compost during first quarter 2026. Documentation is included in Appendix <br /> E. <br /> 4.4.4 Quarterly Compliance <br /> No NOVs were issued by the RWQCB during first quarter 2026. <br /> 5 Summary - First Quarter 2026 <br /> This section summarizes the monitoring results at the Site for first quarter 2026. <br /> • In general, there has been little change in the distribution of VOCs during recent quarters, which suggests that <br /> the groundwater plumes are stable or decreasing. <br /> • A total of sixty-six wells reported one or more VOCs at concentrations exceeding their respective PQLs, with <br /> well CDCR-EW-04 exhibiting the highest total VOC concentrations and 7833-MW-03 exhibiting the highest <br /> detection of any single VOC concentration (Tables 3a through 3c). <br /> • A CNSDAM evaluation of the environmental monitoring results for the Site in first quarter 2026 indicates that <br /> one detection or upgradient program monitoring wells, MW-13A, is to be resampled during second quarter <br /> 2026 due to VOC detections above the MDLs (Table 4). <br /> • There was one exceedance above CLs for inorganic constituents during first quarter 2026 at detection and <br /> upgradient program monitoring well MW-26 for pH. Monitoring well MW-26 is to be resampled during second <br /> quarter 2026 as a result of the exceedance. In a letter dated April 30, 2026, the RWQCB was notified of this <br /> exceedance (Forward 2026). <br /> • Analytical results from site monitoring wells during first quarter 2026 are consistent with historical trends. <br /> • Surface water samples were collected from two of the four surface water monitoring locations during first <br /> quarter 2026. <br /> • For unsaturated-zone monitoring locations, two suction lysimeters (LY-Pond-N and LY-A) contained sufficient <br /> liquid for analysis of VOCs (Table 5a). The samples did not contain sufficient liquid for analysis of inorganic <br /> parameters. <br /> www.arcadis.com <br /> Forward Landfill 1Q26 QMR 12 <br />