COMPLIANCE INFO_AMENDED JTD 1/5/2026

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Permit Unit Requirements for N-4070-1-11 (continued) Page 6 of 14 PERMIT UNIT REQUIREMENTS CONTINUE ON NEXT PAGE These terms and conditions are part of the Facility-wide Permit to Operate. Facility Name: FOOTHILL SANITARY LANDFILL Location: 6484 N WAVERLY RD,LINDEN, CA 95236 N-4070-1-11 : 9/24/2025 3:25:45 PM -- ROBINSOM 52. Carbon monoxide concentration monitoring shall be conducted by sampling directly from the wellhead using EPA Method 10 of appendix A-4 to 40 CFR Part 60, an equivalent method with a detection limit of at least 100 ppmv of carbon monoxide in high concentrations of methane, or by collecting the sample from the wellhead sampling port in a passivated canister or multi-layer foil gas sampling bag and analyzing that sample using EPA Method 10 of appendix A-4 to 40 CFR Part 60. When sampling directly from the wellhead, the owner or operator shall sample for 5 minutes plus twice the response time of the analyzer. When collecting samples in a passivated canister or multi-layer foil gas sampling bag, the owner or operator shall sample for the period of time needed to assure that enough sample is collected to provide 5 consecutive, 1-minute samples during the analysis of the canister or bag contents, but no less than 5 minutes plus twice the response time of the analyzer. The owner or operator shall record all values measured to determine carbon monoxide concentration and the 5 consecutive, 1-minute averages shall be averaged to provide the carbon monoxide concentration value from the wellhead. [40 CFR 63.1961(a)(5)(vi)] Federally Enforceable Through Title V Permit 53. Permittee shall begin enhanced monitoring no later than 7 calendar days after the first measurement of landfill gas temperature greater than 62.8 degrees Celsius (145 degrees Fahrenheit). The enhanced monitoring shall be conducted on a weekly basis. If four consecutive weekly carbon monoxide readings are under 100 ppmv, then enhanced monitoring may be decreased to a monthly basis. If a monthly carbon monoxide reading exceeds 100 ppmv, the owner or operator shall return to weekly monitoring. The owner or operator may cease enhanced monitoring once a higher operating temperature is approved or once the measured landfill gas temperature is less than or equal to 62.8 degrees Celsius (145 degrees Fahrenheit). [40 CFR 63.1961(a)(5)] Federally Enforceable Through Title V Permit 54. For each wellhead with a measurement of landfill gas temperature greater than or equal to 73.9 degrees Celsius (165 degrees Fahrenheit), permittee shall annually monitor the temperature of the landfill gas every 10 vertical feet of the well. Temperature can be monitored either with a removable thermocouple, or using thermocouples installed every 10 vertical feet of the well. [40 CFR 63.1961(a)(6)] Federally Enforceable Through Title V Permit 55. The collection system shall be operated such that the methane concentration is less than 500 parts per million above background at the surface of the landfill. Compliance with this surface methane operational standard shall be demonstrated using the following procedures on a quarterly basis: (1) The operator shall monitor surface concentrations of methane along the entire perimeter of the collection area and along a pattern that traverses the landfill at no more than 30 meter intervals. The operator may establish an alternative traversing pattern that ensures equivalent coverage with prior approval from the District. A surface monitoring design plan shall be developed that includes a topographical map with the monitoring route and the rationale for any site-specific deviations from the 30- meter intervals. Areas with steep slopes or other dangerous areas may be excluded from the surface testing, (2) The background concentration shall be determined by moving the probe inlet upwind and downwind outside the boundary of the landfill at a distance of at least 30 meters from the perimeter wells, and (3) Surface emission monitoring shall be performed in accordance with section 8.3.1 of EPA Method 21 of 40 CFR Part 60, except that the probe inlet shall be placed within 5 to 10 centimeters of the ground. Monitoring shall be performed during typical meteorological conditions. [40 CFR 63.1958(d), 40 CFR 63.1960(c), and 40 CFR 60.8] Federally Enforceable Through Title V Permit