Section 204.1000  Stack Heights

a)         The degree of emission limitation required for control of any air pollutant under this Part shall not be affected in any manner by:

1)         So much portion of the stack height of any source that exceeds good engineering practice; or

2)         Any other dispersion technique.

b)         Subsection (a) shall not apply with respect to stack heights in existence before December 31, 1970 or to dispersion techniques implemented before then.