{longname} 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?
{longname}

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)).

Where the HHV for a fuel lot is missing, determine a substitute value by calculating the arithmetic average of the quality-assured HHVs for the fuel lots delivered immediately before and immediately after the fuel lot for which the HHV is missing. If the "after" value has not been obtained by the time that the GHG emissions report is due, you may use the "before" value for missing data substitution or the best available estimate of the HHV of the fuel lot. If no quality-assured data are available for the fuel lot delivered prior to that for which the HHV is missing, the substitute data value shall be the first quality-assured value obtained from a subsequent fuel delivery. (See §98.35(b)(1).)

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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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