Transmission Gully Marine Benthic Monitoring: Report on Baseline 2 Sampling

This report describes the winter 2013 (Baseline 2) marine benthic monitoring, conducted in early July, and presents a brief description of the benthic invertebrate communities, habitats, sediment types, and sediment contaminant concentrations found at each site. All samples collected were surface samples from either intertidal or subtidal locations. Sampling was conducted at 10 subtidal and 10 intertidal monitoring sites in Porirua Harbour, to quantify and describe benthic communities, sediment characteristics and sediment contaminant levels. Specifically, at the subtidal sites, eight 10 cm diam. x 15 cm deep cores were collected using divers, for macroinvertebrate identification and enumeration and three composite core samples were collected for sediment contaminant and grain size analysis. The surface sediment (0-3 cm) was removed from 5 or 6 smaller cores (7 cm diameter) and these fractions were pooled to produce a composite core sample for contaminant and grain size analysis. One core (13 cm diameter x 15 cm deep) was collected from each intertidal site at low tide from within one 5 m x 5 m grid to determine community composition. A 0.25 m² quadrat was also photographed adjacent to each macroinvertebrate core for later assessment of epifaunal invertebrate community and macroalgal cover. Three samples of surface sediment (0-2 cm) were collected from each site for sediment contaminant and grain size analyses. Three composite samples were prepared, by combining samples from grids A, B, C, D, E (sample 1), from grids F, G, H, I, J (Sample 2), and from grids K, L, M, N, O (Sample 3). All sediment contaminant samples were collected using clean HDPE plastic trowels and trays. Samples were sealed in double zip-lock bags and stored on ice until shipped to the laboratory for processing.
 
Citation proposal
Greg Olsen (NIWA) - Jane Halliday (NIWA) - Peter Marriott (NIWA) - Mark Fenwick (NIWA) - Kelly Carter (NIWA). .
 

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Date ( Revision )
Purpose
As part of the planned Transmission Gully roading development, MWH commissioned NIWA to carry out the winter 2013 (Baseline 2) monitoring of marine benthic habitats in Porirua Harbour. 
Credit
Vonda Cummings, Greg Olsen, Jane Halliday, Peter Marriott, Mark Fenwick, Kelly Carter (NIWA). 
Status
Completed  

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Spatial representation type
Vector  
Topic category
  • Transportation
Description
Wellington Region-Porirua Harbour 
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  • Transmission Gully, Porirua Harbour, sediment contaminants, grain size, marine benthic monitoring, PAHs, heavy metals, bioavailable metals
NIWA Project Codes
  • MWH14301
Use limitation
Commercial report. Data collection and analysis commissioned by MWH for New Zealand Transport Agency (NZTA). 
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Permission required from NZTA to use Data. 
Use limitation
Data collection and analysis commissioned by MWH for NZTA. Permissions required to use data. via Point of contact 
Classification
Confidential  
Language
English  
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48181b90-21a7-137f-97d7-d50fe2dd2bf4

Language
English  
Character encoding
UTF8  

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Dataset  
Date info ( Creation )
2015-06-12T11:51:41
Title
ISO 19115-3 
 
 

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