Client name: NSW Ports (formerly Port Kembla Port Corporation)

Duration: 2007 - 2012

Location: Sydney, New South Wales, Australia


Supporting Port Kembla to maintain sound environmental management practices.  

Situation

The Port needed a tug berth facility in the outer harbour. Given the local environs and tidal flows there was a need to assess the sediment quality to evaluate disposal options.  Sediment disposal attracts a relatively high cost due to complex management including the need for dewatering, if disposed on land.

Port Kembla inner harbour had a large stockpile of dredged spoil.  Without a clear picture of the makeup of the spoil it could not either be permanently disposed of or re-used.

Several sediment pond sites within the inner harbour needed to be assessed for sediment and water quality.  The ponds were to be reclaimed to allow construction of a new car import facility.  The assessments were needed to ensure an adequate sediment and water disposal option was selected.

The Port had a relatively large stockpile of ballast fines. Potentially these were going to have to be disposed of offsite - at considerable cost to the Port.

Solution

Coffey completed a sediment assessment and works included arranging specialist divers to retrieve core samples for sediment analysis. 

The results were compared to offshore disposal and waste classification guidelines which enabled the Port to make informed decisions regarding disposal.

We completed an assessment of the spoil. By employing environmental chemical testing and geotechnical field trials we were able to advise the Port of their options. The material was found to contain acid sulfate soils and so couldn’t be re-used on site.

The stockpile was eventually disposed below water in a reclamation area within the inner harbour.  This enabled the Port to minimise their reclamation and disposal costs.

The works involved assessment of chemical contaminants, acid sulfate soils and water quality parameters for disposal or re-use options.

Our advice enabled the Port to make decisions regarding appropriate sediment and water disposal options.

Our team navigated the NSW EPA’s resource recovery guidelines and were able to make specific application to EPA for beneficial re-use of the material.

Result

A successful sustainable result was achieved allowing the material to be re-used without having to be disposed and wasting valuable landfill space.