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Where:
Qi = NMOC emission rate from the ith section, megagrams per year.
k = Methane generation rate constant, year 1.
Lo = Methane generation potential, cubic meters per megagram solid waste.
Mi = Mass of the degradable solid waste in the ith section, megagram.
ti = Age of the solid waste in the ith section, years.
CNMOC = Concentration of NMOC, parts-permillion by volume.
3.6 109 = Conversion factor.

B If the owner or operator is proposing to exclude, or cease gas collection and control from, nonproductive physically separated e.g., separately lined closed areas that already have gas collection systems, NMOC emissions from each physically separated closed area must be computed using either Equation 3 in 62.16718 or Equation 7 in paragraph a3iiA of this section.
iii The values for k and CNMOC
determined in field testing must be used if field testing has been performed in determining the NMOC emission rate or the radii of influence the distance from the well center to a point in the landfill where the pressure gradient applied by the blower or compressor approaches zero. If field testing has not been performed, the default values for k, Lo, and CNMOC provided in 62.16718 or the alternative values from 62.16718
must be used. The mass of nondegradable solid waste contained within the given section may be subtracted from the total mass of the section when estimating emissions provided the nature, location, age, and amount of the nondegradable material is documented as provided in paragraph a3i of this section.
b Each owner or operator seeking to comply with 62.16714b must construct the gas collection devices using the following equipment or procedures:
1 The landfill gas extraction components must be constructed of polyvinyl chloride PVC, high density polyethylene HDPE pipe, fiberglass, stainless steel, or other nonporous corrosion resistant material of suitable dimensions to: Convey projected amounts of gases; withstand installation, static, and settlement forces; and withstand planned overburden or traffic loads. The collection system must extend as necessary to comply with emission and migration standards. Collection devices such as wells and horizontal collectors
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must be perforated to allow gas entry without head loss sufficient to impair performance across the intended extent of control. Perforations must be situated with regard to the need to prevent excessive air infiltration.
2 Vertical wells must be placed so as not to endanger underlying liners and must address the occurrence of water within the landfill. Holes and trenches constructed for piped wells and horizontal collectors must be of sufficient cross-section so as to allow for their proper construction and completion including, for example, centering of pipes and placement of gravel backfill. Collection devices must be designed so as not to allow indirect short circuiting of air into the cover or refuse into the collection system or gas into the air. Any gravel used around pipe perforations should be of a dimension so as not to penetrate or block perforations.
3 Collection devices may be connected to the collection header pipes below or above the landfill surface. The connector assembly must include a positive closing throttle valve, any necessary seals and couplings, access couplings and at least one sampling port. The collection devices must be constructed of PVC, HDPE, fiberglass, stainless steel, or other nonporous material of suitable thickness.
c Each owner or operator seeking to comply with 62.16714c must convey the landfill gas to a control system in compliance with 62.16714c through the collection header pipes. The gas mover equipment must be sized to handle the maximum gas generation flow rate expected over the intended use period of the gas moving equipment using the following procedures:
1 For existing collection systems, the flow data must be used to project the maximum flow rate. If no flow data exist, the procedures in paragraph c2
of this section must be used.
2 For new collection systems, the maximum flow rate must be in accordance with 62.16720a1.
62.16730

Definitions.

Terms used but not defined in this subpart have the meaning given them in the Clean Air Act and in subparts A and B of 40 CFR part 60 of this chapter.
Achieve final compliance means to connect and operate the collection and control system as specified in the final control plan. Within 180 days after the date the landfill is required to achieve final compliance, the initial performance test must be conducted.

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Active collection system means a gas collection system that uses gas mover equipment.
Active landfill means a landfill in which solid waste is being placed or a landfill that is planned to accept waste in the future.
Administrator means the Administrator of the U.S.
Environmental Protection Agency or his/her authorized representative or the Administrator of a state air pollution control agency.
Award contract means the MSW
landfill owner or operator enters into legally binding agreements or contractual obligations that cannot be canceled or modified without substantial financial loss to the MSW
landfill owner or operator. The MSW
landfill owner or operator may award a number of contracts to install the collection and control system. To meet this increment of progress, the MSW
landfill owner or operator must award a contract or contracts to initiate on-site construction or installation of the collection and control system.
Closed landfill means a landfill in which solid waste is no longer being placed, and in which no additional solid wastes will be placed without first filing a notification of modification as prescribed under 40 CFR 60.7a4 of this chapter. Once a notification of modification has been filed, and additional solid waste is placed in the landfill, the landfill is no longer closed.
Closed area means a separately lined area of an MSW landfill in which solid waste is no longer being placed. If additional solid waste is placed in that area of the landfill, that landfill area is no longer closed. The area must be separately lined to ensure that the landfill gas does not migrate between open and closed areas.
Closed landfill subcategory means a closed landfill that has submitted a closure report as specified in 62.16724f on or before September 27, 2017.
Closure means that point in time when a landfill becomes a closed landfill.
Commercial solid waste means all types of solid waste generated by stores, offices, restaurants, warehouses, and other nonmanufacturing activities, excluding residential and industrial wastes.
Complete on-site construction means that all necessary collection system components and air pollution control devices identified in the final control
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Federal Register / Vol. 86, No. 97 / Friday, May 21, 2021 / Rules and Regulations