5.—(1) Subject to the provisions of this Schedule and except to the extent that the Environment Agency or another person is liable to maintain any such work and is not precluded by the exercise of the powers conferred by this Order from doing so, the undertaker shall from the commencement of the construction of the specified works maintain in good repair and condition and free from obstruction any drainage work which is situated within the limits of deviation or on land held by the undertaker for the purposes of or in connection with the specified works, whether or not the drainage work is constructed under the powers conferred by this Order or is already in existence.
(2) If any such drainage work which the undertaker is liable to maintain is not maintained to the reasonable satisfaction of the Environment Agency, the Environment Agency may by notice in writing require the undertaker to repair and restore the work, or any part of such work, or (if the undertaker so elects and the Environment Agency in writing consents, such consent not to be unreasonably withheld), to remove the work and restore the site to its former condition, to such extent and within such limits as the Environment Agency reasonably requires.
(3) Subject to paragraph 8, if, within a reasonable period being not less than 28 days beginning with the date on which a notice in respect of any work is served under sub-paragraph (2) on the undertaker, the undertaker has failed to begin taking steps to comply with the reasonable requirements of the notice and has not subsequently made reasonably expeditious progress towards their implementation, the Environment Agency may do what is necessary for such compliance and may recover any expenditure reasonably incurred by it in so doing from the undertaker.
(4) In the event of any dispute as to the reasonableness of any requirement of a notice served under sub-paragraph (2), the Environment Agency shall not, except in a case of an emergency, exercise the powers conferred by sub-paragraph (3) above until the dispute has been finally determined.