(a) which was not previously identified in the environmental statement is found at any time  when carrying out the authorised development; or  (b) is encountered following the further ground investigation of boreholes BHC06 and  BHC101 referred to in the ground investigation report carried out under sub-paragraph  (1)(a); or  (c) is encountered whilst following the further ground investigation within the limits of  deviation of Work No. 5 carried out under sub-paragraph (1)(b),  56 Navigation risk assessment  Written schemes of investigation  Mooring  it must be reported as soon as reasonably practicable to the county planning authority, the local  planning authority, the Environment Agency, and, in the event of any contaminated land,  including groundwater, being found within Lowestoft Harbour, the harbour authority.  (3) As soon as reasonably practicable (and in any event not later than 30 days) following the  submission of a report pursuant to sub-paragraph (1), the undertaker must submit for approval a  scheme to the county planning authority setting out how the nature and extent of contamination on  site will be assessed by way of an investigation and risk assessment.  (4) The undertaker must implement the approved scheme and upon completion of it submit for  approval to the county planning authority a written report of the findings of the scheme.  (5) If the county planning authority determines, following receipt of the report submitted by the  undertaker pursuant to sub-paragraph (4), that remediation of the contaminated land is necessary, a  written scheme and programme for the remedial measures to be taken to render the land fit for its  intended purpose, must be submitted for approval by the county planning authority.  (6) Remediation must be carried out in accordance with the scheme approved under sub- paragraph (5).  (7) Following completion of the remediation carried out pursuant to sub-paragraph (5), a  verification report that demonstrates the effectiveness of the remediation carried out must be  submitted to the county planning authority for approval.  (8) In this paragraph, where approval or determination is sought by the undertaker from the  county planning authority, before giving any approval or determination the county planning  authority must consult with the local planning authority, the Environment Agency and, where the  approval or determination relates to matters within Lowestoft Harbour, the harbour authority.  9.  The new bridge must not be opened for traffic until Work No. 7 has been made available for  use by recreational vessels.  10.  The authorised development must be carried out in accordance with the scheme-wide written  scheme of investigation.  11. —(1) Prior to commencement of construction of the new bridge and following consultation  with the harbour authority, the undertaker must undertake a vessel simulation which takes account  of the final design of the new bridge.  (2) Prior to commencement of construction of the new bridge and following consultation with  the harbour authority and the PMSC Stakeholder Group, the undertaker must update the  preliminary navigation risk assessment to take account of the final design and construction  methodology of the new bridge and, in doing so, must use the results of the vessel simulation  carried out under sub-paragraph (1).  (3) Following the update of the preliminary navigation risk assessment carried out pursuant to  sub-paragraph (2), the undertaker must submit the updated navigation risk assessment to the  harbour authority for its approval, which must not be unreasonably withheld. 