Operating month means any calendar or accounting month in which a source processes any quantity of listed oilseed, excluding any entire calendar or accounting month in which the source operated under an initial startup period as described in 63.2850(2) or (d)(2), or a malfunction period as described in 63.2850(e)(2). An operating month may include time intervals characterized by several types of operating status. However, an operating month must have at least one normal operating period.
40 CFR § 63.2872
Terms used in this subpart are defined in the sources listed: