The NOx RACT requirements for tangential or face-fired boilers that are subject to Env-A 1305.03(a) and fire, or are capable of firing, a combination of oil and gas, shall be as follows:

1. (a) When firing gas exclusively:

   1. (1) An emission limit of 0.10 lb. per million Btu, based on an hourly average; or
   2. (2) Implement NOx RACT control technology as specified in Env-A 1305.03(b);

2. (b) When firing oil exclusively:

   1. (1) When firing No. 2 fuel oil exclusively, an emission limit of 0.12 lb. per million Btu, based on an hourly average; and

   2. (2) When firing No. 4, 5, or 6 fuel oil, or any combination thereof:

      1. a. An emission limit of 0.30 lb. per million Btu, based on a 24-hour calendar day average; or
      2. b. Implement NOx RACT control technology as specified in Env-A 1305.04(b); and

3. (c) When firing a combination of oil and gas:

   1. (1) When firing gas and No. 2 fuel oil, an emission limit of 0.12 lb. per million Btu, based on an hourly average; and

   2. (2) When firing gas and No. 4, 5, or 6 fuel oil, or any combination thereof:

      1. a. An emission limit of 0.30 lb. per million Btu, based on a 24-hour calendar day average; or
      2. b. Implement NOx RACT control technology as specified in Env-A 1305.03(b).

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 1305.07)