of the plant that contribute directly to the production of electricity. For example, at a
pulverized coal-fired facility, the process unit would generally be the combination of
those systems from the coal receiving equipment through the emission stack (excluding
post-combustion pollution controls), including the coal handling equipment, pulverizers
or coal crushers, feedwater heaters, ash handling, boiler, burners, turbine-generator set,
condenser, cooling tower, water treatment system, air preheaters, and operating control
systems. Each separate generating unit is a separate process unit.
(B) For a petroleum refinery, there are several categories of process units: those that
separate or distill, or both petroleum feedstocks; those that change molecular structures;
petroleum treating processes; auxiliary facilities, such as steam generators and hydrogen
production units; and those that load, unload, blend or store intermediate or completed
(C) For an incinerator, the process unit would consist of components from the feed pit
or refuse pit to the stack, including conveyors, combustion devices, heat exchangers and
steam generators, quench tanks, and fans.
(dd) “Project” means a physical change in, or change in the method of operation of,
an existing major stationary source.
(ee) “Projected actual emissions” means the following:
(i) The maximum annual rate, in tons per year, at which an existing emissions unit is
projected to emit a regulated new source review pollutant in any one of the 5 12-month
periods following the date the unit resumes regular operation after the project, or in any 1
of the 10 12-month periods following that date, if the project involves increasing the
emissions unit's design capacity or its potential to emit of that regulated new source
review pollutant and full utilization of the unit would result in a significant emissions
increase or a significant net emissions increase at the major stationary source.
(ii) In determining the projected actual emissions before beginning actual
construction, the owner or operator of the major stationary source shall do the following:
(A) Consider all relevant information, including but not limited to, historical
operational data, the company's own representations, the company's expected business
activity, and the company's highest projections of business activity, the company's filings
with the state or federal regulatory authorities, and compliance plans under the approved
state implementation plan.
(B) Include fugitive emissions to the extent quantifiable, and emissions associated
with startups, shutdowns, and malfunctions.
(C) Exclude, in calculating any increase in emissions that results from the particular
project, that portion of the unit's emissions following the project that an existing unit
could have accommodated during the consecutive 24-month period used to establish the
baseline actual emissions of this rule and that are also unrelated to the particular project,
including any increased utilization due to product demand growth.
(D) Elect to use the emissions unit's potential to emit in tons per year instead of
calculating projected actual emissions.
(ff) “Regulated new source review pollutant” means any of the following:
(i) Oxides of nitrogen or any volatile organic compounds.
(ii) Any pollutant for which a national ambient air quality standard has been
(iii) Any pollutant that is a constituent or precursor of a general pollutant listed under