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Mr. Robert Fagerness 11 March 2026 Page 4 performance monitoring. Therefore, no further changes to the GWMP are being proposed herein but will be further evaluated as the remedy continues to progress. No WDR-MRP monitoring locations were selected for destruction as they continue to provide remedy performance evaluation data including groundwater flow direction, groundwater gradient and plume extent. However,considering the robust groundwater monitoring data collected to date, ancillary parameters that no longer provide added benefit are proposed to be removed from the WDR-MRP as noted below: • Permanganate at all wells: Large-scale in-situ chemical oxidation (ISCO) injection activities concluded six years ago and permanganate is rarely reported during sampling activities, even following more recent direct-push injection activities 8. Therefore, permanganate monitoring is proposed to be removed for all wells. • Suite B Parameters (Total chromium,total potassium, and total dissolved solids [TDS]) at treatment zone wells (Figure 1): These constituents were previously sampled to assess secondary groundwater effects following ISCO injections. These constituents have remained stable and provide no added benefit for remedial performance evaluation within the treatment zone. Therefore,these constituents are proposed to be removed for treatment zone wells. However, hexavalent chromium will continue to be monitored semi-annually. It is recognized that additional focused ISCO injections may be implemented to support current groundwater remediation activities at the Site. Should ISCO injections be implemented, post- injection performance monitoring for the aforementioned constituents will resume for a duration approved by the CVRWQCB. SCHEDULE AND REPORTING Following CVRWQCB approval of the well destruction notification,the wells identified on Figure 1 will be destroyed using procedures previously approved by the CVRWQCB and in alignment with San Joaquin County Environmental Health Department (SJCEHD) requirements. This work is anticipated to be completed in the summer of 2026 pending procurement of necessary permits and access agreements with property owners/tenants. Documentation of the well destructions will be included in a Well Destruction Completion Report to be submitted to the CVRWQCB. Additionally, following CVRWQCB approval of the monitoring modification request, the 8 Geosyntec. 2026. Second Semi-Annual 2025 Waste Discharge Requirement Groundwater Monitoring Report, Lincoln Center, Stockton,California. 1 February. engineers I scientists I innovators