Q86. Does Tier 3 have to be used if a unit is less than or equal to 250 mmBtu per hour, but has a continuous gas chromatograph to determine carbon content?

A86. Tier 3 is not required for any unit that is less than or equal to 250 mmBtu/hr, however a source may opt to use Tier 3 if it has the capability of determining carbon content and (if applicable) molecular weight at the required frequency specified in §98.34(b).

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Source: This question and answer was derived from a Legacy FAQ

Approval / Publishing History: Version 1

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Relevant Subparts: Subpart C

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