1. (a) For utility boilers that fire, or that are capable of firing, oil or gas, or any combination thereof, the NOx RACT requirements shall be as follows:

   1. (1) For tangential or face-fired boilers when firing exclusively oil, an emission limit of 0.35 lb. per million Btu, based on a 24-hour calendar day average;
   2. (2) For face-fired boilers when firing gas or any combination of oil and gas, an emission limit of 0.25 lb. per million Btu based on a 24-hour calendar day average; and
   3. (3) For tangential-fired boilers when firing gas or any combination of oil and gas, an emission limit of 0.25 lb. per million Btu based on a 24-hour calendar day average.
2. (b) For boilers that fire gas exclusively, an emission limit of 0.20 lb. per million Btu, based on an hourly average, for tangential or face-fired boilers.

3. (c) For boilers that fire wood fuel or that are capable of firing a combination of wood fuel and oil:

   1. (1) For boilers equipped with a traveling, shaker, or vibrating grate, an emission limit of 0.33 lb. per million Btu, based on a 24-hour calendar day average; and
   2. (2) For boilers equipped with a stationary grate, an emission limit of 0.25 lb. per million Btu, based on a 24-hour calendar day average.
4. (d) Utility boilers that fire any fuel or combination of fuels excluding coal shall be limited at all times to the equivalent of 3.8 tons of NOx per 24-hour calendar day.

Source. (See Revision Note at chapter heading for Env-A 1300) #9803, eff 10-31-10; ss by #12584, eff 8-15-18 (formerly Env-A 1303.07)