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Date: 8/14/25 Time: 9:00 AM TABLE 1 Third Quarter 2025 Landfill Gas Perimeter Migration Monitoring Results North County Recycling Center And Sanitary Landfill Field Technician: Ken Espinoza Monitoring Well CH4 CO2 O2 Balance Pressure Monitoring Well CH4 CO2 O2 Balance PressureProbe(%-Vol)(%-Vol)(%-Vol)(%-Vol)(in WC)Probe (%-Vol)(%-Vol)(%-Vol)(%-Vol)(in WC) SG-1 S 0.10 1.90 18.50 79.50 -0.41 SG-14 S 0.10 0.90 19.00 80.00 -3.31 SG-1 I 0.10 0.00 20.50 79.40 -0.73 SG-14 I 0.20 0.00 21.50 78.30 -0.67 SG-1 D 0.10 2.50 17.40 80.00 -1.01 SG-14 D 0.20 0.00 21.50 78.30 -0.26 SG-2 S 0.10 3.00 18.50 78.40 -0.53 SG-15 S 0.10 1.70 19.50 78.70 -0.52 SG-2 I 0.20 0.40 20.30 79.10 -1.49 SG-15 I 0.10 0.10 21.20 78.60 -2.04 SG-2 D 0.20 0.00 20.60 79.20 -0.63 SG-15 D 0.10 0.10 21.20 78.60 -0.67 SG-3 S 0.30 1.50 17.50 80.70 -1.26 SG-16 SA SG-3 I 0.20 0.70 19.20 79.90 -0.09 SG-16 S 0.10 1.40 19.40 79.10 -0.44 SG-3 D 0.20 0.10 20.40 79.30 -0.67 SG-16 I 0.10 0.00 20.90 79.00 -1.80 SG-8 S 0.00 3.60 10.90 85.50 -0.67 SG-16 D 0.00 0.60 20.00 79.40 -0.93 SG-8 I 0.00 2.50 6.70 90.80 -9.33 SG-16 SB 0.00 1.40 19.40 79.20 -0.39 SG-8 D 0.00 0.00 20.70 79.30 -0.50 SG-17 S 0.00 3.00 18.00 79.00 -0.42 SG-9 S #N/A #N/A #N/A #N/A #N/A SG-17 I 0.00 0.10 20.50 79.40 -3.39 SG-9 I #N/A #N/A #N/A #N/A #N/A SG-17 D 0.00 0.00 20.40 79.60 -1.18 SG-9 D #N/A #N/A #N/A #N/A #N/A SG-18 S 0.00 0.20 20.20 79.60 -0.28 SG-10 S 0.00 0.00 20.80 79.20 -0.27 SG-18 I 0.00 0.20 13.50 86.30 -20.89 SG-10 I 0.00 0.50 19.50 80.00 -1.18 SG-18 D 0.00 0.00 20.50 79.50 -1.30 SG-10 D 0.00 0.00 20.70 79.30 -2.77 SG-19 S 0.00 0.20 18.60 81.20 -10.79 SG-11 S 0.20 0.10 20.10 79.60 -0.22 SG-19 I 0.10 1.20 19.00 79.70 -0.35 SG-11 I 0.10 0.10 20.20 79.60 -1.32 SG-19 D 0.10 0.00 20.70 79.20 -1.42 SG-11 D 0.20 0.10 20.20 79.50 -1.40 SG-20 S 0.10 0.20 20.60 79.10 -0.39 SG-12 S 0.10 0.10 20.10 79.70 -0.57 SG-20 I 0.10 0.40 20.30 79.20 -0.10 SG-12 I 0.10 0.00 20.20 79.70 -0.96 SG-20 D 0.20 0.00 21.00 78.80 -1.20 SG-12 D 0.10 0.10 20.10 79.70 -1.32 SG-21 S 0.00 1.50 18.60 79.90 -0.52 SG-13 S 0.10 0.80 19.50 79.60 -1.76 SG-21 I 0.00 0.50 19.40 80.10 -0.42 SG-13 I 0.10 0.00 21.50 78.40 -1.27 SG-21 D 0.00 0.00 20.60 79.40 -4.77 SG-13 D 0.10 0.00 21.40 78.50 -0.77 SG-22 S 0.00 0.00 20.50 79.50 -0.29 SG-4 0.00 1.20 19.10 79.10 -0.41 SG-22 I 0.00 0.00 20.50 79.50 -0.50 SG-22 D 0.10 0.10 20.50 79.30 -1.60 Field Notes Abbreviations:General Notes Temp: 71 °F Wind: 5 MPH SE SG-"n" = Soil Gas Monitoring Well SG-16-SA was flooded S= Shallow Probe,I= Intermediate Probe Probe 9 was not measured due to an oversight. Instrument: GEM-5000 D = Deep Probe %-Vol = Percent by Volume Monitoring Procedure: The Landfill Gas Monitoring plan revised in Jan 2010 was followed. Monitoring probes were visually inspected for any damages first. The Gem was used to purge probes for 1 min,and then readings were recorded for another 1 min No sample retrieved due to flooded probe Barometric Pressure: 29.95" Hg Instrument Calibration Date: 7/17/25 Revised 4-2-2024 N:\1North County\LFG Migration Monitoring\Probes n Structures Reports\2025\3rd Qtr Auto\NC_3rd Qtr LFG Perim Mig Monit 2025 Wells San Joaquin County Public Works Solid Waste Division