{longname} Q77. For a unit that has an O2 monitor and doesn't meet the conditions required to use Tier 4, but elects to use Tier 4, what are the monitoring requirements?
{longname}

A77. If a facility elects to use Tier 4, thenA Tier 4 unit is required to report CO{~}2~ mass emissions beginning on January 1, 2010, if all of the Tiermonitors 4needed requirementsto must be met. In this case, a stack flow monitor must be installed and certified, and the O2 monitor may be used in lieu of installing and certifying a CO2 monitor, provided that: (1) only fuels listed in Table 1 in section 3.3.5 of Part 75, Appendix F are combusted in the unit; and (2) the effluent stream does not include any CO2 emissions from non-combustion processes or emission control systems. (See §98.33(a)(4)(iv)). However, the RATA of the O2 monitor must be conducted on a %CO2 basis comparing the calculated CO2 concentrations to the CO2 reference method. (See §98.34(c)(2))

measure CO{~}2~ mass emissions have been installed and certified by that date.  If all of the monitors needed to measure CO{~}2~ mass emissions have not been installed and certified by January 1, 2010, the unit is required to report CO{~}2~ mass emissions using Tier 4 no later than January 1, 2011 and use Tier 2 or Tier 3 to report emissions for 2010.

If your facility meets the applicability requirements of 98.3(d)(3),  you may submit an abbreviated report in 2011, for your 2010 emissions. If your facility qualifies to use the abbreviated report, you may use any Tier for quantifying emissions from stationary combustion in 2010. 
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Source: This question and answer was derived from a Legacy FAQ

Approval / Publishing History: Version 1 

Expiration : none 

Relevant Subparts:  Subpart C
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