11. The operator shall ensure that—
(a)the measures taken to protect the health and safety of those persons identified in regulation 7(1)(b)(i) and (ii) are reviewed—
(i)on a regular basis to ensure compliance with the relevant statutory provisions; and
(ii)whenever the circumstances require it, including where there has been a significant change in the way that the quarry operates; and
(b)the regularity with which such reviews are to take place is specified in the health and safety document.