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Federal Register / Vol. 86, No. 97 / Friday, May 21, 2021 / Rules and Regulations
A The gas collection and control system must have operated for at least 6,570 out of 8,760 hours preceding the Tier 4 SEM demonstration.
B During the Tier 4 SEM
demonstration, the gas collection and
control system must operate as it normally would to collect and control as much landfill gas as possible.
b After the installation and startup of a collection and control system in compliance with this subpart, the owner
or operator must calculate the NMOC
emission rate for purposes of determining when the system can be capped, removed, or decommissioned as provided in 62.16714f, using Equation 3:

Where:
MNMOC = Mass emission rate of NMOC, megagrams per year.
QLFG = Flow rate of landfill gas, cubic meters per minute.
CNMOC = NMOC concentration, parts per million by volume as hexane.

purposes of determining when the system can be capped or removed, the owner or operator must submit the results according to 62.16724j2.
ii Reserved c When calculating emissions for Prevention of Significant Deterioration purposes, the owner or operator of each MSW landfill subject to the provisions of this subpart must estimate the NMOC
emission rate for comparison to the Prevention of Significant Deterioration major source and significance levels in 51.166 or 52.21 of this chapter using Compilation of Air Pollutant Emission Factors, Volume I: Stationary Point and Area Sources AP42 or other approved measurement procedures.
d For the performance test required in 62.16714c1, the net heating value of the combusted landfill gas as determined in 40 CFR 60.18f3 of this chapter is calculated from the concentration of methane in the landfill gas as measured by EPA Method 3C. A
minimum of three 30-minute EPA
Method 3C samples are determined. The measurement of other organic components, hydrogen, and carbon monoxide is not applicable. EPA
Method 3C may be used to determine the landfill gas molecular weight for calculating the flare gas exit velocity under 40 CFR 60.18f4 of this chapter.
1 Performance test results. Within 60 days after the date of completing each performance test as defined in 60.8 of this chapter, the owner or operator must submit the results of the performance tests required by paragraph
b or d of this section, including any associated fuel analyses, according to 62.16724j1.
2 Reserved e For the performance test required in 62.16714c2, EPA Method 25 or 25C EPA Method 25C may be used at the inlet only of appendix A7 of 40
CFR part 60 must be used to determine compliance with the 98 weight-percent efficiency or the 20 parts-per-million by volume outlet NMOC concentration level, unless another method to demonstrate compliance has been approved by the Administrator as provided by 62.16724d2. EPA
Method 3, 3A, or 3C of appendix A2
of 40 CFR part 60 must be used to determine oxygen for correcting the NMOC concentration as hexane to 3
percent. In cases where the outlet concentration is less than 50 parts-permillion NMOC as carbon 8 parts-permillion NMOC as hexane, EPA Method 25A should be used in place of EPA
Method 25. EPA Method 18 of appendix A6 of 40 CFR part 60 may be used in conjunction with EPA Method 25A on a limited basis compound specific, e.g., methane or EPA Method 3C may be used to determine methane. The methane as carbon should be subtracted from the EPA Method 25A total hydrocarbon value as carbon to give NMOC concentration as carbon. The landfill owner or operator must divide the NMOC concentration as carbon by 6
to convert the CNMOC as carbon to CNMOC
as hexane. Equation 4 must be used to calculate efficiency:

Control Efficiency= NMOCin - NMOC ut I NMOCin
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0

Where:
NMOCin = Mass of NMOC entering control device.
NMOCout = Mass of NMOC exiting control device.

62.16720

1 Performance test submission.
Within 60 days after the date of completing each performance test as defined in 60.8 of this chapter, the owner or operator must submit the results of the performance tests,
Follow the compliance provisions in this section as well as the provisions in 62.16716 and 62.16722, or the compliance provisions in 63.1960 of this chapter as well as the provisions in 63.1958 and 63.1961 of this chapter, or both as alternative means of
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including any associated fuel analyses, according to 62.16724j1.
2 Reserved
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Compliance provisions.

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Eq. 4

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 63.1960 of this chapter, the owner or operator must continue to operate the collection and control device according to those provisions and cannot return to the provisions of this section.

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1 Flow rate. The flow rate of landfill gas, QLFG, must be determined by measuring the total landfill gas flow rate at the common header pipe that leads to the control system using a gas flow measuring device calibrated according to the provisions of section 10 of EPA
Method 2E of appendix A1 of 40 CFR
part 60.
2 NMOC concentration. The average NMOC concentration, CNMOC, must be determined by collecting and analyzing landfill gas sampled from the common header pipe before the gas moving or condensate removal equipment using the procedures in EPA Method 25 or EPA Method 25C of appendix A7 of 40
CFR part 60. The sample location on the common header pipe must be before any condensate removal or other gas refining units. The landfill owner or operator must divide the NMOC concentration from EPA Method 25 or EPA Method 25C of appendix A7 of 40 CFR part 60
by six to convert from CNMOC as carbon to CNMOC as hexane.
3 Gas flow rate method. The owner or operator may use another method to determine landfill gas flow rate and NMOC concentration if the method has been approved by the Administrator.
i Within 60 days after the date of calculating the NMOC emission rate for
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