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4683 Chabot Dr., #200, Pleasanton, CA 94588 | 925-426-0080 <br />Environmental Consultants & Contractors <br />January 15, 2025 <br />Project No. 01221044.11 <br />Mr. Brendan Kenny <br />Central Valley Regional Water Quality Control Board <br />11020 Sun Center Drive <br />Rancho Cordova, CA 95670 <br />Subject: FOURTH QUARTER 2024 LFG GCCS UPDATE <br />FORWARD LANDFILL <br />MANTECA, CALIFORNIA 95336 <br />Dear Mr. Kenny: <br />On behalf of Republic Services and Forward, Inc. (Forward), SCS Engineers (SCS) is pleased to <br />submit the Fourth Quarter 2024 Corrective Action Program Update for the landfill gas (LFG) <br />collection and control system (GCCS) at the Forward Landfill (Landfill or Site), located in Manteca, <br />California. Information herein is being provided to the Central Valley Regional Water Quality Control <br />Board (CVRWQCB) as part of the directives set forth in Cleanup and Abatement Order (CAO) R5- <br />2017-0703 (Order). Please see the details for compliance and operations below. <br />ORDER COMPLIANCE <br />The following is a summary of the fourth quarter 2024 activities performed as they pertain to the <br />performance and improvements of the GCCS: <br />•Continued monitoring of twelve (12) perimeter gas monitoring probes. The current probe <br />network subject to the CAO includes probes GP-1A through GP-6A, and GP-10 through GP-15. <br />All CAO probes were monitored on October 4, 2024 and October 7, 2024 as part of SCS Field <br />Services (SCSFS) site-wide LFG monitoring and onsite structure testing event. Note that <br />testing, monitoring protocols, and reporting were performed in general conformance with <br />Title 27 California Code of Regulations (CCR) Article 6. The monitoring results for the CAO <br />probes are presented in attached Table 1. <br />•During the fourth quarter, probes GP-10D, GP-10M and GP-10S had exceedances of <br />methane greater than 1 percent by volume. Probes GP-2AM, GP-4AD, GP-4AS, GP-5AM, GP- <br />10D, GP-10M, GP-10S, and GP-12D had volatile organic compound (VOC) concentrations <br />above 10 parts per billion (ppb). <br />•Per the CAO, based on the exceedances’ measured during the year, samples were collected <br />and laboratory analytical testing by Environmental Protection Agency Method TO-15 (TO-15) <br />was performed. The TO-15 sampling for the point of compliance probes was performed on <br />October 7, 2024 and the sampling analytical results are provided as an attachment to this <br />report.