Operating day

Operating day means a 24-hour period between 12 midnight and the following midnight during which any fuel is combusted at any time in the boiler or process heater unit. It is not necessary for fuel to be combusted for the entire 24-hour period. For calculating rolling average emissions, an operating day does not include the hours of operation during startup or shutdown.

Source

40 CFR § 63.7575

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Scoping language

Terms used in this subpart are defined in the Clean Air Act, in 63.2 (the General Provisions), and in this section as follows:

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