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WIA15301

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    Wellington International Airport Limited (WIAL) propose to lengthen the existing runway from approximately 1950 m to at least 2300 m. This would be achieved by extending the current runway area into Lyall Bay, Wellington. Sediment sampling and chemical analyses were performed. All contaminant levels were well below ANZECC sediment quality guidelines. Contaminant concentrations in Lyall Bay surficial sediments were very low and uniformly distributed across the study area, including at sites most likely to be disturbed by construction activities. Mobilisation of sediment from 0-0.2 m depths from within the area of the proposed runway extension is not expected to result in any significant increase in sediment contaminant concentrations in surrounding areas. From a contaminant perspective, the risk of adverse effects on the water column from transient sediment suspension/disturbance events during construction is very low given that water column concentrations, even after allowing for reasonable mixing, are estimated to be at least two orders of magnitude lower than default ANZECC water quality trigger values.