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Geosynte& 1111 Broadway, Floor <br /> Oakland,Californias 94607 <br /> PH 510.285.2700 <br /> consultants www.geosyntec.com <br /> April 13, 2026 <br /> Mr. Brendan P. Kenny, RG <br /> Central Valley Regional Water Quality Control Board <br /> 11020 Sun Center Drive <br /> Rancho Cordova, CA 95670 <br /> Subject: First Quarter 2026 Corrective Action Program Update <br /> Forward Landfill <br /> Manteca, California, 95336 <br /> Dear Mr. Kenny: <br /> On behalf of Republic Services and Forward Landfill Inc. (Forward), Geosyntec Consultants Inc. <br /> (Geosyntec), is pleased to present the First Quarter 2026 Corrective Action Program Update for <br /> the landfill gas collection and control system (GCCS) at Forward Landfill (Landfill) in Manteca, <br /> California. <br /> The Landfill is a municipal solid waste (MSW) landfill that is regulated under Cleanup and <br /> Abatement Order (CAO) R5-2017-0703 and Waste Discharge Requirements (WDR) Order R5- <br /> 2024-0002. This report is being submitted to the Central Valley Regional Water Quality Control <br /> Board(CVRWQCB) in accordance with the CAO R5-2017-0703. The sections that follow outline <br /> the compliance and operational details at the Landfill. <br /> QUARTERLY MONITORING REPORT: FIRST QUARTER(Q1) 2026 <br /> Following CAO R5-2017-0703 and WDR Order R5-2024-0002, Forward is required to submit <br /> quarterly corrective action program updates. These updates include quarterly monitoring results of <br /> the probes subject to CAO and operational status of the gas collection and control system(GCCS). <br /> The sections below summarize the results obtained from sampling and monitoring activities <br /> performed by SCS Engineers(SCS)at the Landfill in the first quarter of 2026 and GCCS operation. <br /> MONITORING PROBES <br /> The CAO point of compliance monitoring probes includes GP-lA through GP-6A and GP-10 <br /> through GP-15 quarterly. Furthermore, WDR Order R5-2024-0002, requires monitoring GP-07R <br /> through GP-12R and GP-17 through GP-28R quarterly.Under the CAO, each probe interval needs <br /> to be sampled annually in accordance with TO-15 if either methane concentrations exceed 1 <br /> percent by volume and/or total organic vapors exceed 10 parts per billion by volume (ppbv). <br /> Table I shows the probe monitoring data for the first quarter of 2026. On 9 February 2026, the <br /> following gas probes had methane concentrations exceeding I%by volume: <br /> Q 1 Corrective Action Program Update-2026 <br /> engineers I scientists I innovators <br />