40.—(1) No stage of the authorised development must commence
(a)until an assessment of the noise impacts of those construction works has been carried out for that stage of all the relevant residential properties lying within maximum threshold distances for main construction activities and listed in Environmental Statement Document 5.14 Appendix 14A Tables 2, 3 and 4; and
(b)a scheme to mitigate any impacts has been submitted to and approved by the relevant planning authority.
(2) Any works of mitigation must be carried out in accordance with the scheme before the start of construction works for that stage of the authorised development.