Before commencing remedial operations, or as soon thereafter as is reasonably practicable, the local authority shall serve a notice in the prescribed form, specifying the nature and extent of the remedial operations and of any consequential works of reinstatement which it proposes to carry out, on every person falling within paragraphs (a) to (e) of section 14(4) and, for this purpose, for the words “service of the notice on the owner of the tip” in paragraph (b) of section 14(4) there shall be substituted the words “commencement of the remedial operations”.