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Osvaldo Cordero Forward, Inc. March 3, 2025 (through January 2020). The treated effluent is discharged to a recharge basin to the northeast of the current Forward Landfill. During third quarter 20247, the GWTS treated approximately 46,453,549 gallons of extracted groundwater, which represents an average flow rate of approximately 530,180 gallons per day. Based on the extracted volumes and measured VOC concentrations, the GWTS removed approximately 0.66 pound of VOCs in third quarter 2024. To prevent the migration of impacted groundwater from the site and comply with the CAOs, the following corrective actions have also been implemented: • POC groundwater capture and treatment: This component was the sequential installation of groundwater extraction wells at the POC to obtain groundwater capture and prevent release of groundwater impacts from the site to hydraulically downgradient areas. Additionally, downgradient monitoring wells screened in the shallow and intermediate groundwater zones confirm VOC capture at the POC and subsequently downgradient migration of a clean waterfront. • Artificial recharge basin: This basin introduces clean water into the shallow aquifer, creating a clean groundwater mound that restricts plume migration northward from the eastern portion of the POC and partly directs impacted groundwater toward the POC capture wells on the western side of the POC. • Residential GWTSs: Fourteen residential GWTS remove VOCs from the domestic water supply via a particulate filter and two GAC canisters to provide supplemental water to the residences. These systems are sampled quarterly until the RWQCB agrees in writing that a specific domestic well is outside the plume footprint and no longer requires sampling, as stipulated in the CAOs. 2 Potential Water Quality Impacts Water quality impacts at WMUs are typically related to: (a) surface water degradation associated with the contact of refuse with surface water or liquid (leachate) and discharge at the WMU to surface waters; (b)vadose zone degradation associated with either LFG or moisture migration from the WMU; and (c) groundwater degradation associated with WMU leachate or LFG migration to the water table. The following sections describe potential ways that landfill constituents may be released and subsequently impact water quality beneath and adjacent to the WMU. 2.1 Potential Surface Water Impacts One way leachate from WMUs can impact waters is by direct contact between surface waters and refuse. The presence of effective drainage controls at the Forward Landfill minimizes that potential condition. All wastes at the Forward Landfill are kept separated from the North Fork and South Fork of Littlejohns Creek. Surface run-off from landfill areas is channeled to sedimentation basins located near the two southwestern corners of landfill, adjacent to the creeks. Water in the sedimentation basins typically evaporates. Accordingly, creek waters are routed to not encounter wastes. The only potential surface water impact is related to controlled run-off from the site. The surface water control system on the Forward Landfill is designed for a 1,000-year, 24-hour precipitation event. In addition, an 7 Arcadis.2024.Third Quarter Monitoring Report,Forward Landfill.November 1. www.arcadis.com 4/8 FL Rev Financial Assurance 20250303