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Permit Unit Requirements for N-4070-1-10 (continued) Page 4 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 36. For the purpose of demonstrating whether the landfill gas collection system flow rate is sufficient, the owner or operator shall measure gauge pressure in the gas collection system header at each individual well on a monthly basis. Except in cases where the conditions allow the wellhead to operate without a negative pressure (as outlined in this permit), action shall be initiated to correct the exceedance within 5 calendar days if a positive pressure exists. If negative pressure cannot be achieved without excess air infiltration within 15 calendar days of the first measurement, the gas collection system shall be expanded to correct the exceedance within 120 days of the initial measurement of a positive pressure. Any attempted corrective measure shall not cause exceedances or other operational or performance standards. An alternative timeline for correcting the exceedance may be submitted to the District for approval. Expansion of the collection system during the first 180 days after gas collection system startup is not required. [40 CFR 60.755(a)(3), 60.755(a)(4), and 40 CFR 63 Subpart AAAA] 37. For the purpose of identifying whether excess air infiltration into the landfill is occurring, the permittee shall monitor the temperature and nitrogen or oxygen on a monthly basis. If a well exceeds one of the temperature, nitrogen, or oxygen operating parameters of this permit, action shall be initiated to correct the exceedance within five calendar days. If correction of the exceedance cannot be achieved within 15 calendar days of the first measurement, the gas collection system shall be expanded to correct the exceedance within 120 days of the initial exceedance. Any attempted corrective measure shall not cause exceedances of other operational or performance standards. An alternative timeline for correcting the exceedance may be submitted to the District for approval. [40 CFR 60.755(a)(5) and 40 CFR 63 Subpart AAAA] 38. Extraction wells shall be installed no later than 60 days after the date on which the initial solid waste has been in place for a period of: 1) 5 years or more for an active landfill; 2) 2 years or more for a closed landfill or a landfill at final grade. [40 CFR 60.755(b) and 40 CFR 63 Subpart AAAA] 39. Monitoring to determine the surface concentration of methane shall be conducted using an organic vapor analyzer, flame ionization detector, or other portable monitor meeting the specifications of 40 CFR 60.755(d). [40 CFR 60.755(c)(1), 40 CFR 60.755(d), and 40 CFR 63 Subpart AAAA] 40. The background concentration of methane shall be determined by moving the probe inlet upwind and downwind the outside boundary of the landfill at a distance of at least 30 meters from the perimeter walls. [40 CFR 60.755(c)(2) and 40 CFR 63 Subpart AAAA] 41. Surface monitoring of the methane concentration shall be performed in accordance with Section 4.3.1 of EPA Method 21 of Appendix A of 40 CFR, 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 60.755(c)(3) and 40 CFR 63 Subpart AAAA] 42. Any surface monitoring reading of 500 parts per million or more above background at any location shall be recorded as a monitored exceedance and the following actions shall be taken. As long as the following specified actions are taken, the exceedance is not a violation of the operational requirements of 40 CFR 60.753(d): 1) The location of each monitored exceedance shall be marked and the location recorded; 2) Cover maintenance or adjustments to the vacuum of the adjacent wells to increase the gas collection of the vicinity of each exceedance shall be made and the location shall be re-monitored within 10 calendar days of detecting the exceedance; 3) If the re-monitoring of the location shows a second exceedance, additional corrective action shall be taken and the location shall be monitored again within 10 days of the second exceedance. If re-monitoring shows a third exceedance, the action specified in item #5 of this condition shall be taken, and no further monitoring of that location is required until the action specified in item #5 has been taken; 4) Any location that initially showed an exceedance but has a methane concentration of less than 500 ppm above background at the 10-day re-monitoring shall be re-monitored 1 month from the initial exceedance. If the 1-month re-monitoring shows a concentration less than 500 parts per million above background, no further monitoring of that location is required until the next quarterly monitoring period. If the 1-month re-monitoring shows an exceedance, the actions specified in item #3 or item #5 of this condition shall be taken.; and 5) For any location where the monitored methane concentration equals or exceed 500 parts per million above background three times within a quarterly period, a new well or other collection device shall be installed within 120 calendar days of the initial exceedance. An alternative remedy to the exceedance, such as upgrading the blower, header pipes, or flare, and a corresponding timeline for installation may be submitted to the District for approval. [40 CFR 60.755(c)(4) and 40 CFR 63 Subpart AAAA]