30. Obligation: Any equipment used or installed in a pit or quarry for the purpose of reducing or preventing the emission of contaminants into the environment shall at all times be in working condition and shall operate at optimum efficiency during the production hours of the plant, even if the equipment causes a reduction in the emission of contaminants that is within the standards prescribed in this Regulation.
R.R.Q., 1981, c. Q-2, r. 2, s. 30.