20.—(1) For 30 minutes prior to the commencement of any piling or blasting operations which are required for the construction of any of the works, the Authority shall employ and use their reasonable endeavours to have available at any requisite time a person having experience of cetacean monitoring and equipped with a suitable acoustic device to watch for cetaceans and, if that person reports that any cetaceans are swimming within a 500 metre radius of the site of that proposed piling or blasting operation, the Authority shall secure that the proposed piling or blasting operation shall be delayed until that person reports that he or she is reasonably satisfied that there are no cetaceans within that radius.
(2) The Authority shall use their reasonable endeavours to ensure that any piling or blasting operations which are required for the construction of any of the works shall not take place during any period when cetaceans are observed within the vicinity of the proposed piling or blasting operation where they are likely to be killed or injured, and appropriate scaring measures shall be used to allow those cetaceans to vacate that vicinity.