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Quarterly Monitoring Report – Third Quarter 2025 <br />www.arcadis.com <br />Forward Landfill 3Q25 Quarterly Mon Report 1 <br />1 Introduction <br />This report presents water quality monitoring data generated during third quarter 2025 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 report on behalf of Forward. Water quality monitoring was performed in accordance <br />with the Monitoring and Reporting Program (MRP) specified in the Forward Landfill Waste Discharge <br />Requirements (WDRs) set forth in the Central Valley Regional Water Quality Control Board (RWQCB) Order No. <br />R5-2024-0002 (RWQCB 2024). The WDR and MRP Order No. R5-2024-0002 (superseding Order No. R5-2014- <br />0006 [RWQCB 2014]) was finalized on February 16, 2024, and reporting under this MRP began with the second <br />quarter 2024 monitoring report (Arcadis 2024). <br />2 Detection Monitoring Program Results <br />This section provides the water quality monitoring results for third quarter 2025. Figures 1 through 7 show the <br />various monitoring networks stipulated by the MRP. Each of the following subsections addresses the <br />requirements stated in Section B of the MRP (RWQCB 2024). <br />2.1 Groundwater Monitoring <br />This section describes the groundwater monitoring network at the Site, monitoring activities completed during <br />third quarter 2025, and monitoring results. Groundwater monitoring is conducted in accordance with MRP Section <br />B.1 (RWQCB 2024). <br />2.1.1 Monitoring Network <br />The groundwater monitoring network at the Site currently includes 108 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 2024). A summary of the MRP discrepancies <br />is provided below: <br />x 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 well was inspected in second quarter <br />2025 and will need repairs prior to sampling. The well will be added to the groundwater monitoring network <br />following completion of repairs. <br />x Groundwater monitoring well AMW-54 was abandoned in first quarter 2025 (Arcadis 2025a) and, therefore, <br />will no longer be sampled.