13.—(1) In the case of a Part A installation or Part A mobile plant the Department may, at any time, give notice to the chief inspector specifying the emission limit values or conditions (not containing emission limit values) which it considers are appropriate in relation to preventing or reducing emissions into water.
(2) Where a notice under paragraph (1) specifies emission limit values, the emission limit values required by paragraph (2) of regulation 12 in relation to emissions into water from the installation or mobile plant concerned shall be those specified in that notice or such stricter emission limit values as may be determined by the chief inspector in accordance with paragraph (6) of that regulation or required by paragraph (7) of that regulation.
(3) Where a notice under paragraph (1) specifies conditions in relation to emissions into water from an installation or mobile plant, the permit authorising the operation of that installation or mobile plant shall include those conditions or any more onerous conditions dealing with the same matters as the chief inspector considers to be appropriate.