Wellington Airport Runway Extension: Marine sediments and contaminants (Lyall Bay)

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.
 
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Identification

Data identification

Citation

Date ( Creation )
2015-06-11T01:23:00
Date ( Revision )
2015-06-11T01:23:00
Purpose
The objective of this study of sediment physical and contaminant properties was to establish baseline conditions prior to the runway extension and to characterise the wider environs in Lyall Bay in order to evaluate potential impacts of the proposed engineering development on the seafloor environment. 
Credit
Greg Olsen, Craig Depree, Scott Nodder, Peter Gerring (NIWA) with funding from Wellington International Airport Limited. Contaminant data were generated by accredited laboratories-Asurequality and Hills Laboratories. 
Status
Completed  

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Spatial representation type
Vector  
Topic category
  • Environment

Extent

Description
Wellington Region, Lyall Bay 

coordinates

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S
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W


TimePeriod
2014-08-01T00:00:002015-02-10T00:00:00 
  • Lyall Bay, Wellington, Sediment, Contaminant, Grain size, PAHs, Polycyclic aromatic hydrocarbon, heavy metals, Arsenic, DDTs, organochlorine pesticides, TOC, elutriate testing, nutrients, sulphides
NIWA Project Codes
  • WIA15301

Legal constraints

Use limitation
Access to NIWA Personnel only. Data owned by Wellington International Airport Ltd. Permission required to use elsewhere. 
Other constraints
Access to NIWA Personnel only. Data owned by Wellington International Airport Ltd. Permission required to use elsewhere. 

Security constraints

Use limitation
Access to NIWA Personnel only. Data owned by Wellington International Airport Ltd. Permission required to use elsewhere. Contact Craig Depree (NIWA) for permission to access. 
Classification
Confidential  

Locale

Language
English  

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No information provided.
 

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Text

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Scope

Hierarchy level
Dataset  
Dataset
Wellington International Airport Ltd. extension sediment dataset 
 

Ref. system

Reference system

No information provided.
Reference system identifier
OGP / urn:ogc:def:crs:EPSG::4326

Reference system identifier
NZST/NZDT

 

Md. constraints

Security constraints

Use limitation
Data owned by Wellington International Airport Ltd. 
Classification
Restricted  
 

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