1. (a)

   1. (1) Except as provided in subsection (b) of this section, the plan shall provide that the actuals PAL level for a major stationary source shall be established as the sum of the baseline actual emissions (as defined in Subpart 1 of this part) of the PAL pollutant for each emissions unit at the source, plus an amount equal to the applicable significant level for the PAL pollutant under Subpart 1 of this part or under the Clean Air Act, whichever is lower.

   2. (2)

      1. (A) When establishing the actuals PAL level for a PAL pollutant, only one (1) consecutive twenty-four-month period must be used to determine the baseline actual emissions for all existing emissions units.
      2. (B) However, a different consecutive twenty-four-month period may be used for each different PAL pollutant.
      3. (C) Emissions associated with units that were permanently shut down after this twenty-four-month period must be subtracted from the PAL level.

   3. (3)

      1. (A) The reviewing authority shall specify a reduced PAL level (in tons/year) in the PAL permit to become effective on the future compliance date of any applicable federal or state regulatory requirement or requirements that the reviewing authority is aware of prior to issuance of the PAL permit.
      2. (B) For instance, if the source owner or operator will be required to reduce emissions from industrial boilers in half from baseline emissions of sixty (60) ppm NOx to a new rule limit of thirty (30) ppm, then the permit shall contain a future effective PAL level that is equal to the current PAL level reduced by half of the original baseline emissions of such unit.
2. (b) For newly constructed units (which do not include modifications to existing units) on which actual construction began after the twenty-four-month period, in lieu of adding the baseline actual emissions as specified in subsection (a) of this section, the emissions must be added to the PAL level in an amount equal to the potential to emit of the unit.

Codification Notes: The Clean Air Act, Pub. L. No. 101-549, is codified at 42 U.S.C. § 7401 et seq. "ppm" means parts per million.