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SURFACE EMISSIONS MONITORING PROCEDURES Surface emissions monitoring was conducted in accordance with the LMR. Monitoring was performed with the FID inlet held within 3 inches of the landfill surface while a technician walked a grid in parallel paths not more than 100 feet apart over the surface of the landfill. Cracks, holes, and other cover penetrations in the surface were also tested. Surface emissions readings were monitored continuously and recorded every 5 seconds. Any areas in exceedance of the 200 or 500 ppmv standards (reporting and compliance levels, respectively) would be GPS-tagged and stake- marked for on-site personnel to perform remediation or repairs. The integrated average is based on the readings stored on the instrument which are recorded every 5 seconds. The readings are then downloaded and the averages are calculated for each grid using SCS eTools®. All readings are maintained in this secure SCS database. The readings are not provided in the report due to the volume of readings but can be furnished upon request. Recorded wind speed results are shown in Attachment 6. Wind speed averages were observed to remain below the alternative requested 10 miles per hour, and no instantaneous speeds exceeded 20 miles per hour. No rainfall occurred within 72 hours of the monitoring events. Therefore, site meteorological conditions were within the requested alternatives of the LMR requirements on the above-mentioned dates. TESTING RESULTS During this event, SCS performed the monitoring on a 25-foot pathway in accordance with the rule as required under the LMR. The intent of the monitoring was to identify any specific locations or areas of the landfill surface with organic compound concentrations exceeding the LMR threshold limit values of 500 ppmv measured as methane for instantaneous monitoring, or an average methane concentration of 25 ppmv for the integrated monitoring. During our initial instantaneous monitoring performed on November 11, 2025, ten (10) locations exceeded the 500 ppmv maximum concentration. The required first/second 10-day(LMR/NSPS) and 30-day (NSPS)follow-up monitoring performed on November 21 and December 1 and 11, 2025, respectively, indicated that all locations had returned to compliance following system adjustments and remediation by SCS and site personnel. Based on these monitoring results, no additional monitoring is required. The results of the monitoring are shown in Attachment 3 (Table 1). Calibration logs for the monitoring equipment are provided in Attachment 5. In addition, during the instantaneous monitoring event, SCS performed simultaneous integrated monitoring of the landfill surface. During the integrated monitoring, eight(8) areas exceeded the 25- ppmv regulatory limit. The required first/second 10-day LMR follow-up monitoring performed on November 21 and December 1, 2025, indicated that all areas had returned to compliance following system adjustments and remediation by site personnel or became part of the active fill area on the landfill. Results of the integrated monitoring are shown in Attachment 4 (Table 2). Based on these results, the North County Landfill surface was in compliance with the requirements of the LMR for the fourth quarter of 2025. PRESSURIZED PIPE AND COMPONENT LEAK MONITORING On November 11, 2025, quarterly leak monitoring was performed in accordance with the LMR. SCS performed LFG pressurized pipe and component leak monitoring at the BFS. Monitoring was performed with the detector inlet held one half of an inch from pressurized pipe and associated North County Landfill—Fourth Quarter 2025 www.scsenaineers.com 3