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Date: 7/4/25 <br />Time: 9:00 AM <br />Table 2 <br />Third Quarter 2025 <br />Structure Monitoring for Landfill Gas Results <br />North County Sanitary Landfill <br />Field Technician: Ken 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 20.60 79.00 <br />Office/Main Building Interior (Downstairs Office)0.30 0.10 20.70 78.90 <br />Pumphouse (Electrical Conduit Interior)0.20 0.10 20.60 78.80 <br />Pumphouse (Electrical Conduit Exterior)0.20 0.10 20.50 78.70 <br />Pumphouse (Interior)0.30 0.10 20.70 78.90 <br />Recycling Center (Interior)0.30 0.10 20.90 79.10 <br />Recycling Center (Loading Dock)0.20 0.10 20.80 79.00 <br />Scalehouse (Electrical Conduit)0.20 0.20 19.90 77.90 <br />Scalehouse (Interior)0.30 0.10 20.70 78.90 <br />Field Notes: <br />Weather: Temp: 66 °F Barometric Pressure: 29.95" Hg <br />Instrument: GEM-5000 Wind:6 MPH <br />Instrument Calibration Date: 7/17/25 Wind Direction: E <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\3rd Qtr Auto\NC_3rd Qtr LFG Perim Mig Monit 2025 Structures