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Osvaldo Cordero Forward, Inc. March 3, 2025 i) Groundwater extraction wells with pumps (CDCR-EW-2, CDCR-EW-3, CDCR-EW-4, and CDCR-EW-5 [planned for installation in first half 2025]); ii) Two-inch HDPE conveyance piping from the extraction wells to the GWTS; iii) Electrical and instrumentation wiring and conduit from the GWTS to the extraction wells; iv) Two, 6,000-pound GAC vessels; v) Construction of the concrete pad, with secondary containment; vi) Installation of a power drop to provide electricity to the system; vii) Installation of a sump pump in the secondary containment area; and viii) Installation of a 4-inch HDPE discharge line from the GWTS to the existing infiltration pond. 4) Operation and maintenance of the GWTS, expected to be performed twice per month. Offsite RA GWTS may consist of: 1) Design of an RA Remedy; 2) Permitting and procurement of an RA Remedy; 3) Construction of the RA Remedy; and 4) Operation and maintenance of the RA Remedy. 4 Estimated Release Mitigation Costs To remain in compliance with the WDR, Forward Landfill must establish and maintain assurance of financial responsibility for initiating and completing corrective action for all known or reasonably foreseeable releases from the facility. The estimated release mitigation costs account for action items relating to landfill operations, maintaining the northern POC GWTS, GCCS, the residential GWTSs, operation, maintenance, and reporting for the anticipated lifecycle (or 30 years,whichever is less)of the respective system. Additionally, north of the landfill on the CDCR property, it is anticipated that an offsite IRA and RA GWTS will be needed to remediate VOC impacts located north of Forward Landfill. This assumes that the groundwater impacts identified under the CDCR property required similar treatment technology as used for impacts identified at the landfill. The IRA will likely require additional corrective action measures including the installation of additional groundwater extraction wells and installation of a separate and/or expansion of the existing GWTS. The RA is based on the current understanding of the plume footprint,which is indicated to be stable over several years, and groundwater treatment would likely tie into the IRA GWTS. If additional groundwater impacts are identified, it is likely this would necessitate expansion of the existing CAP to capture the breadth of the potential release plume. Estimated costs to implement the current and anticipated groundwater mitigation measures are presented in Table 1 and have been estimated as approximately$40,711,000. This total is intended to provide a basis for compliance with financial assurance requirements. This cost estimate considers typical well construction and infrastructure costs. The cost estimate recognizes the relative high density of existing downgradient wells at the site, the ongoing CAP and associated evaluation monitoring programs, and anticipates that no additional investigative or monitoring measures would be required to evaluate a release and/or monitor its mitigation. www.arcadis.com 7/8 FL_Rev Financial Assurance_20250303