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Osvaldo Cordero Forward, Inc. March 3, 2025 3.3 Groundwater In the event that groundwater is impacted by landfill constituents, a number of remedial responses could be implemented, depending on the nature, location, and concentration of the waste constituents detected in groundwater. These remediation systems could include ex-situ "pump and treat" methods (such as currently in place) or in-situ treatment of impacted groundwater. If it is determined that impacts are related to LFG migration, additional GCCS wells may also be installed. Should a new release or increasing VOC concentrations be identified, as currently indicated at the Eastern POC, it may necessitate expanding or modifying the existing CAP/monitoring well network. Such an expansion/modification could include construction of new groundwater extraction wells and LFG extraction wells for containment of a release, and installation of new groundwater monitoring wells as part of an evaluation monitoring program or DMP. To treat groundwater north of the Forward Landfill, it is anticipated that an Interim Remedial Action (IRA) and a Remedial Action (RA) are necessary to comply with the corrective action requirements of the CAO.Anticipated actions at the Forward Landfill Eastern POC, GCCS, and as part of the IRA and RA, are listed below. The existing POC GWTS may include the following system modifications associated with the Eastern POC: 1) Design of the GWTS modifications (i.e., adding two new extraction wells at the Eastern POC). 2) Permitting and procurement of the GWTS modifications. 3) Construction of the GWTS modifications, including: i) Two new groundwater extraction wells with pumps and supplied power; 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) Upsized equipment and treatment vessels, depending on flow rate and mass loading; and v) Increased power drop may be needed to provide adequate power to the system/wells. The existing GCCS may include the following system modifications: 1) Design of the GCCS modifications (i.e., adding new gas extraction wells). 2) Permitting and procurement of the GCCS modifications. 3) Construction of the GWTS modifications, including: i) Tuning of individual wells; ii) Inspecting well casings, headers, and laterals for blockages; iii) Replacing wellheads; iv) Abandoning and possibly replacing gas extraction wells; and v) Construction of conveyance piping from the extraction wells to the GCCS. Offsite IRA GWTS may consist of: 1) Design of the GWTS; 2) Permitting and procurement of the GWTS; 3) Construction of the GWTS, including: www.arcadis.com 6/8 FL Rev Financial Assurance 20250303