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Date:5/9/25 Time: 9:00 AM TABLE 1 Second Quarter 2025 Landfill Gas Perimeter Migration Monitoring Results North County Recycling Center And Sanitary Landfill Certified By : Meng Lo 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 1.30 18.90 79.70 -0.37 SG-14 S 0.30 0.20 20.60 78.90 -0.04 SG-1 I 0.10 0.20 19.90 79.80 -0.94 SG-14 I 0.30 0.10 20.70 78.90 -0.35 SG-1 D 0.10 0.10 19.90 79.90 -0.87 SG-14 D 0.30 0.00 20.80 78.90 -0.19 SG-2 S 0.20 0.70 20.20 78.90 0.27 SG-15 S 0.20 0.10 20.70 79.00 0.18 SG-2 I 0.20 0.20 20.80 78.80 0.33 SG-15 I 0.20 0.10 20.70 79.00 -0.47 SG-2 D 0.20 0.00 21.00 78.80 0.29 SG-15 D 0.20 0.10 20.60 79.10 -0.06 SG-3 S 0.30 1.00 18.50 80.20 -0.47 SG-16 SA SG-3 I 0.30 0.30 20.50 78.90 -0.64 SG-16 S 0.20 0.00 20.80 79.00 0.18 SG-3 D 0.20 0.10 20.50 79.20 -0.90 SG-16 I 0.20 0.00 20.80 79.00 -0.47 SG-8 S 0.20 1.40 14.90 83.50 0.15 SG-16 D 0.20 0.00 20.60 79.20 -0.06 SG-8 I 0.20 1.10 14.60 84.10 -3.18 SG-16 SB 0.20 0.70 20.10 79.00 0.10 SG-8 D 0.20 0.00 21.10 78.70 0.18 SG-17 S 0.20 0.00 21.30 78.50 -0.16 SG-9 S 0.30 0.10 20.50 79.10 0.03 SG-17 I 0.20 0.00 21.30 78.50 -0.14 SG-9 I 0.30 0.10 20.50 79.10 -0.54 SG-17 D 0.20 0.10 21.20 78.50 -0.05 SG-9 D 0.30 0.10 20.50 79.10 0.00 SG-18 S 0.20 0.00 21.30 78.50 0.21 SG-10 S 0.30 0.10 21.10 78.50 0.23 SG-18 I 0.20 0.00 21.30 78.50 0.12 SG-10 I 0.20 0.20 20.50 79.10 0.18 SG-18 D 0.20 0.00 21.20 78.60 0.18 SG-10 D 0.20 0.00 20.70 79.10 0.19 SG-19 S 0.20 0.00 20.70 79.10 -0.01 SG-11 S 0.20 0.90 19.50 79.40 0.24 SG-19 I 0.20 0.50 20.50 78.80 0.22 SG-11 I 0.20 0.00 20.60 79.20 0.24 SG-19 D 0.20 0.00 21.20 78.60 0.21 SG-11 D 0.20 0.00 20.60 79.20 0.29 SG-20 S 0.20 0.00 21.30 78.50 0.15 SG-12 S 0.30 0.10 20.70 78.90 -0.09 SG-20 I 0.20 0.00 21.30 78.50 0.19 SG-12 I 0.30 0.10 20.80 78.80 -0.34 SG-20 D 0.20 0.00 21.40 78.40 0.25 SG-12 D 0.30 0.10 20.70 78.90 -0.84 SG-21 S 0.20 0.30 20.40 79.10 0.15 SG-13 S 0.30 0.70 20.20 78.80 -0.82 SG-21 I 0.20 0.30 20.20 79.30 0.27 SG-13 I 0.30 0.10 21.00 78.60 -1.24 SG-21 D 0.20 0.10 20.40 79.30 0.16 SG-13 D 0.30 0.10 20.90 78.70 -0.80 SG-22 S 0.20 0.40 19.40 80.00 0.29 SG-22 I 0.20 0.00 20.70 79.10 0.28 SG-22 D 0.20 0.00 20.90 78.90 0.21 Field Notes Abbreviations:General Notes Temp: 65°F Wind: 4 MPH E SG-"n" = Soil Gas Monitoring Well SG-16-SA was flooded S= Shallow Probe,I= Intermediate Probe Instrument: GEM-5000 D = Deep Probe %-Vol = Percent by Volume Monitoring Procedure: The Landfill Gas Monitoring plan revised in Feb 2025 was followed. Monitoring probes were visualy inspected for any damages first. The Gem unit was then purged for 30 seconds, and then readings were recorded for 60/90/120 seconds for the short/intermediate/deep probes and recorded onto the GEM unit. Data Entry by: Meng Lo Date:5/12/2025 Checked By: No sample retrived due to flooded probe Barometric Pressure: 30.04" Hg Instrument Calibration Date: 5/7/25 Revised 4-2-2024 N:\1North County\LFG Migration Monitoring\Probes n Structures Reports\2025\2nd Qtr Auto\NC_2nd Qtr LFG Perim Mig Monit 2025 Wells San Joaquin County Public Works Solid Waste Division