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Permit Unit Requirements for N-4070-1-10 (continued) Page 3 of 9 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 N-4070-1-10 : Jan 9 2023 2:37PM -- YOSHIMUJ 27. Permittee shall operate the landfill gas collection system with negative pressure at each wellhead except under the following conditions: 1) A fire or increased well temperature. The owner or operator shall record instances when positive pressure occurs in efforts to avoid a fire. These records shall be submitted with the annual reports provided in 40 CFR 60.757(f)(1); 2) Use of a geomembrane or synthetic cover. The owner shall develop acceptable pressure limits in the design plan; 3) A decommissioned well. A well may experience a static positive pressure after shut down to accommodate for declining flows. All design changes shall be approved by the District. [40 CFR 60.753(b) and 40 CFR 63 Subpart AAAA] 28. Unless otherwise stated on this permit, the permittee shall operate each interior wellhead in the collection system with a landfill gas temperature less than 55 degrees C and with either a nitrogen level less than 20 percent or an oxygen level less than 5 percent. [40 CFR 60.753(c) and 40 CFR 63 Subpart AAAA] 29. If the nitrogen level is measured at an interior wellhead, then the nitrogen level shall be determined using EPA Method 3C, unless an alternative test method is established as allowed by 40 CFR 60.752(b)(2)(i). [40 CFR 60.753(c)(1) and 40 CFR 63 Subpart AAAA] 30. For each interior wellhead, unless an alternative test method is established as allowed by 40 CFR 60.752(b)(2)(i), the oxygen level shall be determined by an oxygen meter using EPA Method 3A or 3C except that: 1) The span shall be set so that the regulatory limit is between 20 and 50 percent of the span; 2) A data recorder is not required; 3) Only two calibration gases are required, a zero and span, and ambient air may be used as the span; 4) A calibration check is not required; and 5) The allowable sample bios, zero drift, and calibration drive are plus or minus 10 percent. [40 CFR 60.753(c)(2) and 40 CFR 63 Subpart AAAA] 31. Permittee shall operate the collection system so that the methane concentration is less than 500 parts per million above background at the surface of the landfill. To determine if this level is exceeded, the owner or operator shall conduct surface testing around the perimeter of the collection area and along a pattern that traverses the landfill at 30 meter intervals and where visual observations indicate elevated concentrations of landfill gas, such as distressed vegetation and cracks or seeps in the cover on at least a quarterly basis. Permittee may establish an alternative traversing pattern that ensures equivalent coverage. A surface monitoring design plan shall be developed that includes a topographical map with the monitoring route and the rational 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. [40 CFR 60.753(d), 40 CFR 60.755, and 40 CFR 63 Subpart AAAA] 32. Permittee shall operate the landfill gas collection and control system such that all collected gases are vented to a control system designed and operated in compliance with 40 CFR 60.752(b)(2)(iii). In the event the collection system or control system is inoperable, the gas mover system shall be shut down and all valves in the collection and control system contributing to the venting of the gas to the atmosphere shall be closed within one hour. [40 CFR 60.753(e) and 40 CFR 63 Subpart AAAA] 33. If monitoring demonstrates that the operational requirements in 40 CFR 60.753(b), (c), or (d) are not met, corrective action shall be taken as specified in 40 CFR 60.755(a)(3) through (5) or 40 CFR 60.755(c). If corrective actions are taken as specified in 40 CFR 60.755, the monitored exceedance is not a violation of the operational requirements in 40 CFR 60.753. [40 CFR 60.753(g) and 40 CFR 63 Subpart AAAA] 34. For the purpose of demonstrating that the gas collection system is designed to handle the maximum expected gas flow rate from the entire area of the landfill that warrants control over the intended use period of the gas control system, permittee shall use one of the equations that are listed in 40 CFR 60.755(a)(1). [40 CFR 60.755(a)(1) and 40 CFR 63 Subpart AAAA] 35. For the purpose of determining whether there is a sufficient density of gas collectors, permittee shall design a system of vertical wells, horizontal collectors, or other collection devices satisfactory to the District, capable of controlling and extracting gas from all portions of the landfill sufficient to meet all operational and performance standards. [40 CFR 60.755(a)(2) and 40 CFR 63 Subpart AAAA]