8.—(1) No building comprising part of the authorised development is to be occupied until a flood warning and evacuation plan, which must include details of expected means of evacuation or safe refuge during a tidal flood event with safe refuge areas has been submitted to and approved by the local planning authority.
(2) No phase of the authorised development is to commence until a programme for ground gas monitoring has been agreed with the local planning authority and subsequently implemented. If the monitoring in accordance with the approved scheme gives rise to the need to consider gas protection measures within buildings, these must be agreed with the local planning authority and implemented as agreed.