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TABLE 3 <br />Second Quarter 2025 <br />Structure Monitoring for Landfill Gas Results <br />Foothill Sanitary Landfill <br />Monitoring Date: 5/6/25 Certified By: Ken Espinoza <br />Building and Monitoring Location <br />Methane <br />(% by vol) <br />Carbon <br />Dioxide <br />(% by vol) <br />Oxygen <br />(% by vol) <br />Balance <br />Gas <br />(% by vol) <br />Note <br />Maintenance Building (Electrical Conduit) <br />0.2 <br />0.2 <br />19.9 <br />79.7 <br />Maintenance Building (Interior) <br />0.2 <br />0.1 <br />19.9 <br />79.8 <br />Managers Residence (Electrical) <br />0.1 <br />0.1 <br />20.4 <br />79.4 <br />Managers Residence (Interior) <br />0.1 <br />0.1 <br />20.5 <br />79.3 <br />Managers Residence Crawl Space <br />0.1 <br />0.2 <br />20.4 <br />79.3 <br />Scalehouse (Electrical Conduit) <br />0.2 <br />0.1 <br />20.6 <br />79.1 <br />Scalehouse (Interior) <br />0.2 <br />0.1 <br />24.6 <br />75.1 <br />* Compliance Level: <br />Methane gas to be less than1.25 percent by volume. <br />N:\1 Foothill\LFG Migration Monitoring\2025\2nd Qtr\ <br />FH -2nd Qtr LFG Perim Mig Monit 2025 Structures <br />