Q84. For a unit that is not required to use Tier 4 (CEMS monitoring), which tier is required if you receive HHV with some coal shipments, but not every coal shipment?
A84. If the unit is less than or equal to 250 mmBtu/hr, since you do not obtain HHV at the minimum frequency specified in §98.34(a), you may use Tier 1 to calculate CO2 mass emissions. However, if the unit is greater than 250 mmBtu/hr, then you must ensure that the carbon content of each shipment is determined and use Tier 3. (See §98.34(b)(3)(ii)(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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