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<br /> <br />4683 Chabot Dr., #200, Pleasanton, CA 94588 | 925-426-0080 <br /> <br />Environmental Consultants & Contractors <br /> <br /> <br />January 11, 2024 <br />Project No. 01221044.09 <br /> <br /> <br />Mr. Brendan Kenny <br />Central Valley Regional Water Quality Control Board <br />11020 Sun Center Drive <br />Rancho Cordova, CA 95670 <br /> <br /> <br />Subject: FOURTH QUARTER 2023 LFG GCCS UPDATE <br /> FORWARD LANDFILL <br /> MANTECA, CALIFORNIA 95336 <br /> <br /> <br />Dear Mr. Kenny: <br /> <br />On behalf of Republic Services and Forward, Inc. (Forward), SCS Engineers (SCS) is pleased to <br />submit the Fourth Quarter 2023 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 2023 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 5, 2023 as part of SCS Field Services (SCSFS) <br />site-wide LFG monitoring and onsite structure testing event. Note that testing, monitoring <br />protocols, and reporting were performed in general conformance with Title 27 California <br />Code of Regulations (CCR) Article 6. The monitoring results for the CAO probes are presented <br />in attached Table 1. <br /> <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-2AD, GP-2AM, GP-4AM, GP-4AS, GP- <br />6AM, GP-10D, GP-10M, GP-10S, GP-11D, GP-11S, GP-12D, GP-12M, and GP-13D had <br />volatile organic compound (VOC) concentrations above 10 parts per billion (ppb). <br /> <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 5, 2023 and the sampling analytical results are provided as an attachment to this <br />report. <br />