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Date: 5/7/25 <br />Time: 11:30 AM <br />Table 2 <br />Second Quarter 2025 <br />Structure Monitoring for Landfill Gas Results <br />North County Sanitary Landfill <br />Ceritfied By: 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)0.1 0.1 20.8 79.0 <br />Office/Main Building Interior (Downstairs Office)0.2 0.2 20.7 78.9 <br />Pumphouse (Electrical Conduit Interior)0.0 0.1 20.4 79.5 <br />Pumphouse (Electrical Conduit Exterior)0.0 0.2 20.1 79.7 <br />Pumphouse (Interior)0.2 0.1 20.9 78.8 <br />Recycling Center (Interior)0.1 0.1 20.7 79.1 <br />Recycling Center (Loading Dock)0.1 0.2 20.4 79.3 <br />Scalehouse (Electrical Conduit)0.0 0.1 20.1 79.8 <br />Scalehouse (Interior)0.0 0.1 19.9 80.0 <br />Field Notes: <br />Weather: Sunny Temp: 70°F Barometric Pressure: 30.04" Hg <br />Instrument: GEM-5000 Wind:4 MPH <br />Instrument Calibration Date: 5/7/25 Wind Direction: E <br />Monitoring procedure: <br />Monitoring probes were visualy 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 />Data Entry by: Meng Lo Date: 5.12.25 Checked By: <br />Building and Monitoring Location <br />N:\1North County\LFG Migration Monitoring\Probes n Structures Reports\2025\2nd Qtr Auto\NC_2nd Qtr LFG Perim Mig Monit <br />2025 Structures