§ 63.2250 What are the general requirements?

(a) You must be in compliance with the compliance options, operating requirements, and the work practice requirements in this subpart at all times, except during periods of process unit or control device startup, shutdown, and malfunction; prior to process unit initial startup; and during the routine control device maintenance exemption specified in § 63.2251. The compliance options, operating requirements, and work practice requirements do not apply during times when the process unit(s) subject to the compliance options, operating requirements, and work practice requirements are not operating, or during periods of startup, shutdown, and malfunction. Startup and shutdown periods must not exceed the minimum amount of time necessary for these events. For any affected source that commences construction or reconstruction after September 6, 2019, this paragraph (a) does not apply on and after August 13, 2020 or initial startup of the affected source, whichever is later. For all other affected sources, this paragraph (a) does not apply on and after August 13, 2021.