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Date: 10/14/2025 <br />Time: 9:00 AM <br />Table 2 <br />Fourth Quarter 2025 <br />Structure Monitoring for Landfill Gas Results <br />North County Sanitary Landfill <br />Certified By: K. Espinoza <br />Carbon Balance <br />Methane Dioxide Oxygen Gas <br />(% by vol)(% by vol)(% by vol)(% by vol) <br />Office/Main Building (Electrical Box)0.30 0.10 20.90 78.70 <br />Office/Main Building Interior (Downstairs Office)0.30 0.10 20.80 78.70 <br />Pumphouse (Electrical Conduit Interior)0.30 0.10 20.40 78.90 <br />Pumphouse (Electrical Conduit Exterior)0.30 0.20 20.50 78.80 <br />Pumphouse (Interior)0.30 0.10 20.40 78.90 <br />Recycling Center (Interior)0.30 0.10 20.90 78.60 <br />Recycling Center (Loading Dock)0.30 0.10 20.80 78.60 <br />Scalehouse (Electrical Conduit)0.30 0.10 20.40 78.60 <br />Scalehouse (Interior)0.30 0.20 20.60 78.90 <br />Field Notes: <br />Weather: Cloudy Temp: 53°F Barometric Pressure: 29.78" Hg <br />Instrument: GEM-5000 Wind:7 MPH <br />Instrument Calibration Date: 10/14/25 Wind Direction: North <br />Monitoring procedure: <br />Monitoring probes were visually inspected for any damages first. The Gem was used to purge probes for 1 min <br />and then readings were recorded for another 1 min. <br />Building and Monitoring Location <br />N:\1North County\LFG Migration Monitoring\Probes n Structures Reports\2025\4th Qtr Auto\NC_4th Qtr LFG Perim Mig Monit <br />2025 Structures