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Brendan Kenny <br /> Central Valley Regional Water Quality Control Board <br /> July 15, 2026 <br /> In addition, the landfill GCCS undergoes periodic maintenance and tuning to produce the highest percentage of <br /> landfill gas and to minimize the collection of oxygen. The general operation of the landfill GCCS during the <br /> reporting period is documented by Geosyntec (Attachment 2). During the reporting period, the average flow rates <br /> to flares FL-100 and FL-150 were 1,299 and 1,520 standard cubic feet per minute (scfm), respectively. <br /> Except for standard flare malfunctions or shutdowns, the landfill GCCS operated continuously (24 hours per day) <br /> without any significant downtime. A summary of operation time for FL-100 and FL-150 is provided below: <br /> • Flare FL-100 had a total run time of 681.4 hours and a total downtime of 38.6 hours in April 2026, a total run <br /> time of 744.0 hours and no downtime in May 2026, and a total run time of 717.6 hours and a total downtime of <br /> 2.4 hours in June 2026. Flare FL-100 recorded a maximum adjusted flow rate of 3,785 scfm. <br /> • Flare FL-150 had a total runtime of 682 hours and a total downtime of 38 hours in April 2026, a total runtime <br /> of 726.9 hours and downtime of 17.1 hours in May 2026, and a total run of 717.6 hours and a total downtime <br /> of 2.4 hour in June 2026. Flare FL-150 recorded a maximum adjusted flow rate of 2,868 scfm. <br /> Geosyntec's Second Quarter 2026 Corrective Action Program Update concluded that the data collected by SCS <br /> during the reporting period met the CAO requirements for the operation and maintenance of the landfill GCCS. <br /> Closing <br /> Arcadis will continue to monitor the Site's GWTS, the residential GWTSs, and the facility's landfill GCCS. Program <br /> updates will be submitted to the Water Board by the required due dates. <br /> If you have any questions or need additional information, please contact Dalia Rumani at 626-991-7597. <br /> Sincerely, <br /> Arcadis U.S., Inc. <br /> PQrES91 <br /> C 82542 <br /> Civlt ,! <br /> Dalia Rumani William Semel, PE OFCAL� <br /> Project Manager Principal Engineer <br /> California Professional Engineer#C-82542 <br /> CC. Osvaldo Cordero, Forward, Inc. <br /> Enclosures: <br /> Attachment 1 Groundwater Treatment System Monitoring Logs <br /> Attachment 2 Quarterly Correction Action Program Update—Landfill Gas Collection and Control <br /> System <br /> www.arcadis.com 4/4 <br /> Forward Landfill 2Q26 CAP Update_07.15.2026 <br />