Beach and seabed characteristics, West Coast

Assessments evaluated the impact of the cable on the seabed (biological impacts) and required burial depths to avoid adverse impacts on fishing activity (possible disturbance of cable and associated hazard to fishing). The assessment also considered the burial depth required at ocean beaches such as Ngaranui, where the cable was to be brought onto land. Hearing was held in November 2000. All evidence presented by ASR Ltd (for the applicant) was also reviewed by NIWA. Data was collected and evaluated to determine the environmental impact of placing a cable into the seabed off the West Coast of the North Island and of bringing the cable ashore at Ruapuke and Ngaranui Beaches (Raglan).

Sidescan sonar and bathymetric mapping of seabed. Various planning and engineering assessments are included in evidence prepared by the applicant. Description of the morphology of the cable route (including bedforms and possible cable exposure) and landing zones (Ngaranui Beach). Sediment samples taken and analysed from Ruapuke and Ngaranui Beaches. A brief assessment of climate change included. Intertidal biological survey 29/07/2000. Six faunal samples.

Offshore west coast North Island. Ngaranui and Ruapuke Beaches.

Beach samples at Ruapuke and Ngaranui 9/10/2000

Samples taken from lower, mid and upper beach (2 samples each) from two profiles at each beach (200 m apart) Textural analysis undertaken using Malvern particle analyser (see University of Waikato). Particle size data presented in evidence. Frequency of collection: One-off data collection.

One off data collection.

Assessment of environmental effect and cable burial requirements.

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File closed.