1. (a) Measurements of average face velocity shall be done at all collection points whenever any physical changes are made to the control system; and

2. (b) Any one of the following shall constitute a change to the capture or control equipment, thereby requiring a new CE test:

   1. (1) An increase of more than 10% in the distance between any emission collection point and the emission source that the collection point is serving;
   2. (2) A reduction in the average face velocity at any emission point ducted to the control device to a value less than 90% of the value measured and recorded during a previous CE test, except for reductions occurring at a collection point as a result of a shutdown of the emission point that said collection point is serving; or
   3. (3) A change in the physical structure or operation which causes an increase or decrease in the amount of a specific air pollutant emitted from a device or which results in the emission of any additional air pollutant, and such change is determined by the department to have a significant impact on air quality as determined by modeling conducted in accordance with 40 CFR 51, Appendix W.

Source. #7788, eff 10-31-02; ss by #9802, eff 10-31-10; ss by #12762, eff 5-1-19