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TABLE 3 <br /> Fourth Quarter 2025 <br /> Structure Monitoring for Landfill Gas Results <br /> Foothill Sanitary Landfill <br /> Monitoring Date: 10/14/2025 Certified By: K. Espinoza <br /> Carbon Balance <br /> Building and Monitoring Location Methane Dioxide Oxygen Gas Notes <br /> (% by vol) (% by vol) (% by vol) (% by vol) <br /> Maintenance Building (Electrical Conduit) 0.3 0.1 19.9 78.4 <br /> Maintenance Building (Interior) 0.3 0.1 20.1 78.7 <br /> Managers Residence (Electrical) 0.3 0.1 20.7 79.1 <br /> Managers Residence (Interior) 0.4 0.1 20.8 78.7 <br /> Managers Residence Crawl Space 0.3 0.1 20.4 78.6 <br /> Scalehouse (Electrical Conduit) 0.4 0.1 20.1 78.9 <br /> Scalehouse (Interior) 0.4 0.2 20.4 79.0 <br /> * Compliance Level: <br /> Methane gas to be less than1 .25 percent by volume. <br /> NA1Foothill\LFG Migration Monitoring\2025\4th Qtr\ <br /> FH_4th Qtr LFG Perim Mig Monit 2025 Structures <br />