Q85. Is the use of Subpart C tiers required after 2010 and is it acceptable to use the best available monitoring provisions under Subpart A beyond 2010?
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Yes, the use of Subpart C Tiers is required after 2010. The use of best available monitoring methods as described in Subpart A may not be extended beyond the end of 2010. (See §98.3(d)(2)(iii)).

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