(2)

(2) Exclusion for electric utility steam generating units. The requirements of the regulations referenced in Rule 8.1.A. do not apply to electric utility steam generating units unless and until such time as these units are added to the source category list pursuant to Section 112(c)(5) of the Federal Clean Air Act as amended. (3) Exclusion for stationary sources in deleted source categories. The requirements of the regulations referenced in Rule 8.1.A. do not apply to stationary sources that are within a source category that has been deleted from the source category list pursuant to Section 112(c)(9) of the Federal Clean Air Act as amended. (4) Exclusion for research and development activities. The requirements of the regulations referenced in Rule 8.1.A. do not apply to research and development activities, as defined in the regulations referenced in Rule 8.1.A.