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Date: 10/15/25 Time: 9:00 AM TABLE 1 Fourth Quarter 2025 Landfill Gas Perimeter Migration Monitoring Results North County Recycling Center And Sanitary Landfill Certified By: 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 0.20 0.90 20.10 78.80 -0.37 SG-14 S 0.30 1.70 19.00 79.00 -0.49 SG-1 I 0.20 0.00 20.80 79.00 -0.90 SG-14 I 0.30 0.10 21.00 78.60 -3.30 SG-1 D 0.20 0.00 20.70 79.10 -1.63 SG-14 D 0.30 0.10 21.00 78.60 -3.17 SG-2 S 0.20 2.30 19.20 78.30 -0.32 SG-15 S 0.30 1.40 20.20 78.10 0.08 SG-2 I 0.20 0.10 20.80 78.90 -1.23 SG-15 I 0.20 0.10 21.60 78.10 -3.20 SG-2 D 0.20 0.00 20.80 79.00 -1.99 SG-15 D 0.20 0.00 21.60 78.20 -2.57 SG-3 S 0.20 1.20 18.50 80.10 -0.94 SG-16 SA 0.30 0.70 20.50 78.50 0.27 SG-3 I 0.20 0.30 20.70 78.80 -0.30 SG-16 S 0.30 0.40 20.90 78.40 0.02 SG-3 D 0.20 0.10 20.90 78.80 -1.84 SG-16 I 0.30 0.10 21.30 78.30 -3.43 SG-8 S 0.10 4.00 10.10 85.80 0.07 SG-16 D 0.20 0.60 20.40 78.80 -2.80 SG-8 I 0.10 2.80 6.50 90.60 -14.11 SG-16 SB 0.30 2.90 17.20 79.60 0.28 SG-8 D 0.10 0.00 21.50 78.40 -0.70 SG-17 S 0.10 1.50 19.70 78.70 0.03 SG-9 S 0.30 0.10 21.40 78.20 -1.19 SG-17 I 0.10 0.10 21.20 78.60 -3.68 SG-9 I 0.30 0.00 21.40 78.30 -1.80 SG-17 D 0.10 0.00 21.30 78.60 -3.29 SG-9 D 0.30 0.00 21.50 78.20 -2.85 SG-18 S 0.10 0.00 21.00 78.90 -0.45 SG-10 S 0.20 0.00 21.50 78.30 -2.68 SG-18 I 0.10 0.30 14.00 85.60 -22.34 SG-10 I 0.20 0.00 21.60 78.20 -1.87 SG-18 D 0.10 0.00 21.20 78.70 -3.40 SG-10 D 0.30 0.10 21.60 78.00 -2.65 SG-19 S 0.10 0.20 19.00 80.70 -6.73 SG-11 S 0.30 0.10 20.90 78.70 0.14 SG-19 I 0.10 1.10 19.40 79.40 -0.13 SG-11 I 0.30 0.10 21.00 78.60 -2.47 SG-19 D 0.10 0.00 20.80 79.10 -3.28 SG-11 D 0.30 0.10 21.00 78.60 -2.95 SG-20 S 0.10 0.10 20.30 79.50 0.05 SG-12 S 0.30 0.30 20.50 78.90 -0.24 SG-20 I 0.10 0.00 20.40 79.50 -0.15 SG-12 I 0.30 0.10 20.80 78.80 -2.11 SG-20 D 0.10 0.00 20.40 79.50 -2.98 SG-12 D 0.30 0.10 20.80 78.80 -2.58 SG-21 S 0.20 1.00 20.00 78.80 0.14 SG-13 S 0.40 1.00 19.50 79.10 -0.50 SG-21 I 0.20 0.50 19.60 79.70 -1.29 SG-13 I 0.30 0.10 20.90 78.70 -2.88 SG-21 D 0.20 0.00 20.70 79.10 -6.37 SG-13 D 0.30 0.10 20.80 78.80 -2.70 SG-22 S 0.30 0.00 21.00 78.70 -0.18 SG-22 I 0.30 0.10 20.90 78.70 -0.47 SG-22 D 0.30 0.10 20.90 78.70 -3.09 Field Notes Abbreviations:General Notes Temp: 68 °F Wind: 3 MPH E SG-"n" = Soil Gas Monitoring Well S= Shallow Probe,I= Intermediate Probe Instrument: GEM-5000 D = Deep Probe 10/14/2025 %-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. Barometric Pressure: 29.98" Hg Instrument Calibration Date: Revised 4-2-2024 N:\1North County\LFG Migration Monitoring\Probes n Structures Reports\2025\4th Qtr Auto\NC_4th Qtr LFG Perim Mig Monit 2025 Wells San Joaquin County Public Works Solid Waste Division