{longname} Q133. Can I use more than 1 Tier Method for my facility?
{longname}
A133. Yes. The tier methodology applies to each unit and to each fuel  combusted in a unit. Therefore, you can use different tiers for  different units and different tiers for different fuels in a co-fired  unit (providing that an allowable tier method is used in each  situation). The exception is if you use common pipe provisions for  multiple units. In this case, you must use the highest tier method that  applies to any unit within the aggregated group for which you use the  common pipe provision. (See §98.33(b)(6) and §98.36(c)(3).)

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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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