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Federal Register / Vol. 86, No. 97 / Friday, May 21, 2021 / Rules and Regulations higher tier in 62.16718; or conduct a surface emission monitoring demonstration using the procedures specified in 62.16718a6.
3 For the closed landfill subcategory, if the calculated NMOC emission rate submitted under previously applicable regulations 40 CFR part 60, subpart WWW; 40 CFR part 62, subpart GGG; or a state plan implementing 40 CFR part 60, subpart Cc is equal to or greater than 50 megagrams per year using Tier 1, 2, or 3 procedures, the owner or operator must either: submit a collection and control system design plan as specified in 62.16724d, except for exemptions allowed under 62.16711g3; or calculate NMOC emissions using a higher tier in 62.16718.
f Removal criteria. The collection and control system may be capped, removed, or decommissioned if the following criteria are met:
1 The landfill is a closed landfill as defined in 62.16730. A closure report must be submitted to the Administrator as provided in 62.16724f.
2 The collection and control system has been in operation a minimum of 15
years or the landfill owner or operator demonstrates that the gas collection and control system will be unable to operate for 15 years due to declining gas flow.
3 Following the procedures specified in 62.16718b, the calculated NMOC emission rate at the landfill is less than 34 megagrams per year on three successive test dates. The test dates must be no less than 90 days apart, and no more than 180 days apart.
4 For the closed landfill subcategory as defined in 62.16730, following the procedures specified in 62.16718b, the calculated NMOC emission rate at the landfill is less than 50 megagrams per year on three successive test dates.
The test dates must be no less than 90
days apart, and no more than 180 days apart.

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62.16716 Operational standards for collection and control systems.

Each owner or operator must comply with the provisions for the operational standards in this section as well as the provisions in 62.16720 and 62.16722, or the operational standards in 63.1958 of this chapter as well as the provisions in 63.1960 and 63.1961 of this chapter, or both as alternative means of compliance, for an MSW landfill with a gas collection and control system used to comply with the provisions of 62.16714b and c.
Once the owner or operator begins to comply with the provisions of 63.1958
of this chapter, the owner or operator must continue to operate the collection and control device according to those
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provisions and cannot return to the provisions of this section. Each owner or operator of an MSW landfill with a gas collection and control system used to comply with the provisions of 62.16714b and c must:
a Operate the collection system such that gas is collected from each area, cell, or group of cells in the MSW landfill in which solid waste has been in place for:
1 5 years or more if active; or 2 2 years or more if closed or at final grade;
b Operate the collection system with negative pressure at each wellhead except under the following conditions:
1 A fire or increased well temperature. The owner or operator must record instances when positive pressure occurs in efforts to avoid a fire.
These records must be submitted with the annual reports as provided in 62.16724h1;
2 Use of a geomembrane or synthetic cover. The owner or operator must 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 must be approved by the Administrator as specified in 62.16724d;
c Operate each interior wellhead in the collection system with a landfill gas temperature less than 55 degrees Celsius 131 degrees Fahrenheit. The owner or operator may establish a higher operating temperature value at a particular well. A higher operating value demonstration must be submitted to the Administrator for approval and must include supporting data demonstrating that the elevated parameter neither causes fires nor significantly inhibits anaerobic decomposition by killing methanogens.
The demonstration must satisfy both criteria in order to be approved i.e., neither causing fires nor killing methanogens is acceptable.
d 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 must conduct surface testing using an organic vapor analyzer, flame ionization detector, or other portable monitor meeting the specifications provided in 62.16720d. The owner or operator must conduct surface testing around the perimeter of the collection area and along a pattern that traverses the landfill at no more than 30-meter intervals and where visual observations indicate elevated concentrations of landfill gas,
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such as distressed vegetation and cracks or seeps in the cover and all cover penetrations. Thus, the owner or operator must monitor any openings that are within an area of the landfill where waste has been placed and a gas collection system is required. The owner or operator may establish an alternative traversing pattern that ensures equivalent coverage. A surface monitoring design plan must 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.
e Operate the system such that all collected gases are vented to a control system designed and operated in compliance with 62.16714c. In the event the collection or control system is not operating, the gas mover system must be shut down and all valves in the collection and control system contributing to venting of the gas to the atmosphere must be closed within 1
hour of the collection or control system not operating.
f Operate the control system at all times when the collected gas is routed to the system.
g If monitoring demonstrates that the operational requirements in paragraphs b, c, or d of this section are not met, corrective action must be taken as specified in 62.16720a3 and 5 or 62.16720c. If corrective actions are taken as specified in 62.16720, the monitored exceedance is not a violation of the operational requirements in this section.
62.16718

Test methods and procedures.

Calculate the landfill NMOC emission rate and conduct a surface emission monitoring demonstration according to the provisions in this section.
a1 NMOC Emission rate. The landfill owner or operator must calculate the NMOC emission rate using either Equation 1 provided in paragraph a1i of this section or Equation 2
provided in paragraph a1ii of this section. Both Equation 1 and Equation 2 may be used if the actual year-to-year solid waste acceptance rate is known, as specified in paragraph a1i of this section, for part of the life of the landfill and the actual year-to-year solid waste acceptance rate is unknown, as specified in paragraph a1ii of this section, for part of the life of the landfill. The values to be used in both Equation 1 and Equation 2 are 0.05 per year for k, 170 cubic meters per megagram for Lo, and 4,000 parts per million by volume as hexane for the
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