58.—(1) This regulation applies to Part A installations and Part A mobile plant for which a local authority is the regulator.
(2) At any time the Agency may give notice to the local authority specifying the emission limit values or the conditions it considers appropriate for preventing or reducing emissions into water from the installation or plant.
(3) If such a notice is issued, the local authority must exercise its functions under these Regulations to ensure the environmental permit for the installation or plant includes—
(a)the emission limit values or conditions specified in the notice; or
(b)such stricter limit values or more onerous conditions as the authority thinks fit.
(4) In this regulation, “emission limit value” means the mass, expressed in terms of specific parameters, concentration or level of an emission, which must not be exceeded during a period of time.