Laserfiche WebLink
<br /> <br />4683 Chabot Dr., #200, Pleasanton, CA 94588 | 925-426-0080 <br /> <br />Environmental Consultants & Contractors <br /> <br /> <br />October 12, 2023 <br />Project No. 01221044.07 <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: Third 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 Third 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 third 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 CAO probes were monitored on September 14, 2023 as part of SCS Field Services <br />(SCSFS) site-wide LFG monitoring and onsite structure testing event. Note that testing, <br />monitoring protocols, and reporting were performed in general conformance with Title 27 <br />California Code of Regulations (CCR) Article 6. The monitoring results for the CAO probes are <br />presented in attached Table 1. <br /> <br /> Per the Order, based on the third quarter monitoring results, probe intervals GP-10D, GP- <br />10M, and GP-10S will require annual TO-15 sampling due to a detection of methane greater <br />than 1 percent of 55.8, 47.6, and 49.6, respectively. Probes GP-1AD, GP-1AS, GP-2AD, GP- <br />2AM, GP-3AM, GP-3AS, GP-4AD, GP-5AM, GP-10D, GP-10S, GP-11D, GP-11S, GP-12D, and <br />GP-13D will require annual TO-15 sampling due to VOC concentrations above 10 parts per <br />billion by volume (ppbv). The TO-15 sampling of these probes is conducted on an annual <br />basis and will be sampled later in the year, in conformance with the Order. <br /> <br />COMPLIANCE TESTING INSTRUMENTATION AND METHODS <br />Testing for 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