4. (Replaced, O.C. 501-2011)New or existing stationary sources: Unless specified otherwise, this Regulation applies immediately to new or existing stationary sources.
It applies to any part of an existing stationary source that is modified or enlarged even if it is specified elsewhere that it applies subsequently to this existing stationary source.
R.R.Q., 1981, c. Q-2, r. 20, s. 4; O.C. 501-2011, s. 215.