(a) Compiling a 3-year cycle inventory means much more effort every three years. As an option, your State may ease this workload spike by using the following approach:
(1) Annually collect and report data for all Type A (large) point sources (This is required for all Type A point sources).
(2) Annually collect data for one-third of your smaller point sources (Type B point sources minus Type A (large) point sources). Collect data for a different third of these sources each year so that data has been collected for all of the smaller point sources by the end of each three-year cycle. You may report these data to EPA annually, or as an option you may save three years of data and then report all of the smaller point sources on the three-year cycle due date.
(3) Annually collect data for one-third of the area, nonroad mobile, onroad mobile and, if required, biogenic sources. You may report these data to EPA annually, or as an option you may save three years of data and then report all of these data on the three-year cycle due date.
(b) For the sources described in paragraph (a) of this section, your State will therefore have data from three successive years at any given time,
(c) If your State chooses the method of inventorying one-third of your smaller point sources and 3-year cycle area, nonroad mobile, onroad mobile sources each year, your State must compile each year of the three-year period identically. For example, if a process hasn't changed for a source category or individual plant, your State must use the same emission factors to calculate emissions for each year of the three-year period. If your State has revised emission factors during the three years for a process that hasn't changed, resubmit previous year's data using the revised factor. If your State uses models to estimate emissions, you must make sure that the model is the same for all three years.
(d) If your State chooses the method of inventorying one-third of your smaller point sources and 3-year cycle area, nonroad mobile, onroad mobile sources each year and reporting them on the 3-year cycle due date, the first required date for you to report on all such sources will be June 1, 2004 as specified in § 51.25. You can satisfy the 2004 reporting requirement by either: Starting to inventory one third of your sources in 2000; or doing a one-time complete 3-year cycle inventory for 2002, then changing to the option of inventorying one third of your sources for subsequent years.
(e) If your State needs a new reference year emission inventory for a selected pollutant, your State can't use these optional reporting frequencies for the new reference year.
(f) If your State is a NO