1. a) Retail dry cleaning operations;
2. b) Retail and noncommercial storage and handling of motor fuels;
3. c) Combustion processes using only commercial fuel, including internal combustion engines; and
4. d) Incidental or minor sources including laboratory-scale operations, and such other sources or categories of sources which are determined by the Board to be of minor significance. (Section 9.5(e) of the Act)

The requirements of this Part do not apply to the following: