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Environmental Consultants & Contractors <br />April 13, 2023 <br />Project No. 01221044.07 <br />Mr. Brendan Kenny <br />Central Valley Regional Water Quality Control Board <br />11020 Sun Center Drive <br />Rancho Cordova, CA 95670 <br />Subject: FIRST QUARTER 2023 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 First Quarter 2023 Corrective Action Program Update for the landfill gas (LFG) collection <br />and control system (GCCS) at the Forward Landfill (Landfill or Site), located in Manteca, California. <br />Information herein is being provided to the Central Valley Regional Water Quality Control Board <br />(CVRWQCB) as part of the directives set forth in Cleanup and Abatement Order (CAO) R5-2017-0703 <br />(Order). Please see the details for compliance and operations below. <br />ORDER COMPLIANCE <br />The following is a summary of the first 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 wells GP -1A through GP -6A, and GP -10 through GP -15. <br />All CAD probes were monitored on January 31 and March 20 and 29, 2023 as part of SCS <br />Field 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 />Per the Order, based on the first quarter monitoring results, probe intervals GP -10 D, GP -10M, <br />GP -105, GP -11D, GP -11M, GP -11S, and GP -12D will require annual TO -15 sampling due to a <br />detection of methane greater than 1 percent of 54.9, 59.6, 59.4, 63.8, 70.1, 43.5 and 5.3 <br />percent, respectively. These same probes had VOC concentrations above 10 parts per billion <br />by volume (ppbv). The TO -15 sampling of these probes is conducted on an annual basis and <br />will be sampled later in the year, in conformance with the Order. <br />COMPLIANCE TESTING INSTRUMENTATION AND METHODS <br />Testingfor methane gas, oxygen gas, carbon dioxide gas and pressure was performed using a <br />Landtec GEM -5000 Gas Analyzer calibrated to methane gas. The instrument measures combustible <br />gas concentrations as a percentage by volume (0 to 100 percent) in the gas sampled. The detection <br />4683 Chabot Dr., #200, Pleasanton, CA 94588 1 925-426-0080 <br />