17.—(1) No later than 31 December 2006 the competent authority shall identify all industrial noise sources within first round agglomerations in the preceding calendar year.
(2) No later than 31 December 2011, and thereafter every five years, the competent authority shall identify all industrial noise sources within agglomerations.
(3) No later than 30 June 2007 the competent authority shall make a strategic noise map showing the situation in the preceding calendar year for industrial noise sources within first round agglomerations.
(4) No later than 30 June 2012, and thereafter every five years, the competent authority shall make a strategic noise map showing the situation in the preceding calendar year for industrial noise sources within agglomerations.
(5) Whenever a major development occurs affecting the existing noise situation, the competent authority shall—
(a)review; and
(b)if necessary revise;
any strategic noise map made pursuant to paragraph (3) or (4).