Active gypsum dewatering stack

Active gypsum dewatering stack means a gypsum dewatering stack that is currently receiving gypsum, received gypsum within the last year, or is part of the facility's water management system. A gypsum dewatering stack that is considered closed by a state authority is not considered an active gypsum dewatering stack.

Source

40 CFR § 63.601

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Scoping language

Terms used in this subpart are defined in 63.2 of the Clean Air Act and in this section as follows:

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