(a) The following NO_x emission limits on a parts per million dry volume basis (ppmvd), corrected to 15 percent oxygen must be met as a facility-level weighted average of all applicable SCCTs at a facility:

1. (1) By May 1, 2023:

   	NOx Emission Limit (ppmvd)
   All SCCTs	100

2. (2) By May 1, 2025:

   Fuel Type	NOx Emission Limit (ppmvd)
   Gaseous fuels	25
   Distillate oil or other liquid fuel	42

3. (3) Compliance with these emission limits must be determined by conducting stack tests, as set forth in section 227-2.6(c) of this Title, at a minimum of once per permit term. Alternatively, the owner or operator may choose to use a continuous emissions monitoring system (CEMS) consistent with the provisions of section 227-2.6(b) of this Title.