(1) Actual emission reduction. The actual decrease in the rate of emissions of an air contaminant from an emission source in tons per year. This value is generally an average rate at which the source actually emitted the contaminant during the two years preceding the reduction, and is representative of normal source operation based on actual operating hours, production rates and material input. A different averaging time period may be acceptable if it can be shown to be more representative of normal operation than the two-year period preceding the reductions.

(2) Air contamination source project. This may consist of either a proposed:

(3) Annual actual emissions. The annual emissions, including fugitive emissions, of an air contaminant from a facility after control equipment has been applied and based on continuous operation at maximum capacity. Annual actual emissions may be limited by permit conditions regarding operating time or production rate.

(4) De minimis emission limits. Threshold increase in annual actual emissions from an air contamination source project below which the provisions of this Subpart do not apply. The de minimis emission limits are presented in section 231-1.9 of this Subpart.

(5) Emission offsets. Emissions reductions which are obtained to provide reasonable progress toward attainment of ambient air quality standards in exchange for approval of an application for a permit to construct for a new air contamination source project in a nonattainment area.

(6) Major facility. A facility whose annual actual emissions for either particulates, sulfur dioxide, carbon monoxide, nitrogen oxides, or volatile organic compounds equal or exceed 100 tons per year.

(7) Major lead facility. A facility whose annual actual emissions of lead equal or exceed five tons per year.

(8) Resource recovery facility. Any facility at which refuse is combusted for the purpose of recovering heat for use in producing steam and/or electricity. Energy conversion facilities must utilize solid waste to provide more than 50 percent of the heat input to qualify as a resource recovery facility.