27. Obligation: Any equipment used or installed to reduce or prevent the emission of contaminants from the hot mix asphalt plant into the environment must be in good working order at all times and must operate with optimum efficiency during production hours even if the equipment reduces the emission of the contaminants to a level below the standards prescribed in this Regulation.
R.R.Q., 1981, c. Q-2, r. 25, s. 27.