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SCS monitored structures by testing randomly selected locations where methane gas would most likely accumulate (e.g., electric outlets,junction boxes, conduits, drains, cabinets and closets). Other required monitoring documentation (e.g., sampling personnel, date, time and meteorological conditions) are shown on the attached testing data tables. GAS MONITORING PROBE TESTING In accordance with the approved testing schedule, all perimeter compliance GP probes are to be tested at a minimum, on a quarterly basis. On March 20, 28 and 29, 2023, all accessible perimeter Gas Monitoring Probes defined as GP-01 through GP-28R were tested for the presence of LFG. Test results (Table 1) indicated that all GP probes tested exhibited methane gas concentrations below the LEL(5 percent by volume) or no methane gas was detected. These results indicated that as of the date of this report,the subject site perimeter probes are in compliance with the requirements of Title 27 CCR Article 6. SCS is scheduled to perform the second quarterly monitoring of 2023 (April through June) of the GP probes by the end of the month of June 2023, or more frequently as directed by Republic. NEW POINT OF COMPLIANCE MONITORING PROBE TESTING, SITE WIDE WDR LOCATIONS In accordance with the approved testing schedule, all perimeter compliance GP probes are to be tested at a minimum, on a quarterly basis. During this reporting period, all accessible perimeter Gas Monitoring Probes defined as GP-1A through GP-6A and GP-10 through GP-15 were tested for the presence of LFG. Results of this monitoring indicated that LFG Monitoring Probe Nos. GP-10D, GP-10M, GP-10S, GP- 11D, GP-11M, GP-11S and GP-12D exhibited VOC concentrations in excess of the 10 PPB standard. Highest VOC reading was observed at LFG Monitoring Probe No. GP-11D (up to 3.70 ppm). No methane gas was detected at any location monitored in excess of 1 percent by volume, with the exception of LFG Monitoring Probe Nos. GP-10D (54.90 percent by volume), GP10M (59.60 percent by volume), GP-10S (59.40 percent by volume), GP-11D (63.80 percent by volume), GP-11M (70.10 percent by volume), GP-11S (43.50 percent by volume) and GP-12D (5.30 percent by volume) (please see Table 1). Note, that these probes are intended for evaluation purposes only and are not Title 27 compliance locations. As required, on October 10, 2022, annual samples were obtained and analyzed using EPA method TO-15. These results were submitted directly to Republic. The next annual sampling event will be performed by the end of November 2023, or as requested by the client. SCS is scheduled to perform the second quarterly monitoring of 2023 (April through June) of the GP probes by the end of the month of June 2023, or more frequently as directed by Republic. ON-SITE INTERIOR STRUCTURE TESTING In accordance with the approved testing schedule, the interiors of on-site structures are to be tested at a minimum, on a quarterly basis. On March 29, 2023, on-site structures (i.e., landfill office, scale house, breakroom, storage container and maintenance room) were tested for the presence of methane gas. In each structure, random selected locations (i.e., electrical outlets and junction Forward/Austin Landfill—First Quarter 2023 www.scsengineers.com 2