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Revised Quarterly Monitoring Report – <br />Fourth Quarter/Annual 2024 <br />www.arcadis.com <br />Revised - Forward Landfill 4Q24 Quarterly Mon Report 06262025 1 <br />1 Introduction <br />This report presents water quality monitoring data generated during fourth quarter 2024 at the Forward, Inc. <br />(Forward) Landfill, located at 9999 South Austin Road in San Joaquin County, California (Site). Arcadis U.S., Inc. <br />(Arcadis) has prepared this revised fourth quarter/annual report on behalf of Forward. Water quality monitoring <br />was performed in accordance with the Monitoring and Reporting Program (MRP) specified in the Forward Landfill <br />Waste Discharge Requirements (WDRs) set forth in the Central Valley Regional Water Quality Control Board <br />(RWQCB) Order No. R5-2024-0002 (RWQCB 2024a). The WDR and MRP Order No. R5-2024-0002 <br />(superseding Order No. R5-2014-0006 [RWQCB 2014]) was finalized on February 16, 2024, and reporting under <br />this MRP began with the second quarter 2024 monitoring report (Arcadis 2024g). <br />This report also serves as the annual report for the 2024 calendar year. Monitoring data were previously <br />presented in quarterly reports for first, second, and third quarters 2024 (Arcadis 2024c, 2024g, 2024k). <br />2 Detection Monitoring Program Results <br />This section provides the water quality monitoring results for fourth quarter 2024. Figures 1 through 7 show the <br />various monitoring networks stipulated by the MRP. Each subsection addresses the requirements stated in <br />Section B of the MRP (RWQCB 2024a). <br />2.1 Groundwater Monitoring <br />This section describes the groundwater monitoring network at the Site, monitoring activities completed during <br />fourth quarter 2024, and monitoring results. Groundwater monitoring is conducted in accordance with MRP <br />Section B.1 (RWQCB 2024a). <br />2.1.1 Monitoring Network <br />The groundwater monitoring network at the Site currently includes 109 groundwater monitoring wells, two <br />domestic wells, and three piezometers (Figure 1). Table 1 summarizes the wells in the groundwater monitoring <br />network along with the well’s associated program and construction details. For the dual-nested well pairs, the “B” <br />piezometers are sampled only if the associated “A” well is dry. The groundwater monitoring network in the MRP <br />includes 98 groundwater monitoring wells (including five dual-nested well pairs designated as “A” for shallow and <br />“B” for deep), three domestic wells, and three piezometers (RWQCB 2024a). A summary of the MRP <br />discrepancies is provided below: <br /> Domestic well DW-9690 is included in Table 1 of the MRP and presented on Figure 1; however, this well was <br />reportedly abandoned in fourth quarter 2022 when the corresponding domestic residence was destroyed. <br />Because the well was thought to be abandoned, data were last collected on August 5, 2022. Domestic well <br />DW-9690 was located during a site inspection on April 4, 2025. The integrity of the well will be inspected in <br />second quarter 2025 to determine whether the well can be reincorporated into the quarterly monitoring <br />program.