Contaminated Sites Remediation Fund Priority List

The Contaminated Sites Remediation Fund Priority List is made up of the 10 contaminated sites in New Zealand that are prioritised for Government funding.

For how the list is compiled see About the Contaminated Sites Remediation Fund.

The 10 priority sites

1.  Prohibition Mine

Location

Waiuta, West Coast

Current phase

4 – Remediation

Cost

$3.02 M (including Alexander Mine)

CSRF contribution

$1.5 M (including Alexander Mine)

Landowner

Department of Conservation

Council

West Coast Regional Council

Site description

The Prohibition ore roasting plant site operated from 1935 to 1951 near the Prohibition Shaft of the Prohibition Mine (Waiuta Gold Mine) on the West Coast. Arsenic bearing sulphides were roasted at the plant to release gold. Processing residue containing high concentrations of arsenic in the form of arsenolite accumulated throughout the site.

The Prohibition Mine project has been combined with the nearby Alexander Mine project. A remedial action plan has been developed and remedial works for the site are due to begin in August 2016 and completed by the end of 2016.

2.  Alexander Mine

Location

Grey Valley, West Coast

Current phase

3 – Remedial Planning

Cost

$3.02 M (including Prohibition Mine)

CSRF contribution

$1.5 M (including Prohibition Mine)

Landowner

Department of Conservation

Council

West Coast Regional Council

Site description

The Alexander Mine was a hard rock gold mine that operated between 1924 and 1943 and included a similar ore roasting plant to Prohibition Mine. The mining activity has resulted in significant arsenic, mercury and cyanide contamination of the soil at the site.

The Alexander Mine project has been combined with the nearby Prohibition Mine project. 

3.  Kopeopeo Canal

Location

Whakatāne

Current phase

4 – Remediation

Cost

$11.165 M

CSRF contribution

$4.721 M

Council

Bay of Plenty Regional Council

Site description

The Kopeopeo Canal was constructed to carry surface run-off and flood waters from low lying farmland in the Rangitāiki plains into the Whakatāne Estuary. Between 1950 and 1989 the canal was contaminated by dioxin from surface run-off and storm water discharges from the NZ Forest Products Ltd Sawmill. Investigations in 2005 found that the levels of dioxins in the sediment and in eels were elevated.

The remediation project will remove the contaminated sediments from the Kopeopeo Canal and place them in secure storage cells designed to aid the bioremediation of the dioxins.

Remedial plans are being finalised with works due to begin in late 2016.

4.  Calwell Slipway

Location

Port Nelson, Nelson

Current phase

4 – Remediation

Cost

$8.920 M

CSRF contribution

$4.447 M

Landowner

Port Nelson Limited

Council

Nelson City Council

Site description

The contamination of the Calwell Slipway began in 1970 and is due to the inadequate containment and inappropriate disposal of wash water.  Resource Management Act consents now require vessels being serviced to be out of the water and fully contained before work begins. Wash water and debris from ship maintenance must now be collected and disposed of appropriately.

To restore navigability Port Nelson needs to dredge the Calwell Basin. However the presence of antifouling contaminants such as tributyltin and copper in the sediments requires alternative treatment and disposal options.

Port Nelson will finish the detailed remedial planning for the site in mid 2016. The dredging works to remove the contaminated sediments from the basin are currently scheduled to begin in early 2017.

5.  Concours Electroplaters

Location

Timaru

Council

Environment Canterbury

Site description

An electroplating business has operated from the Concours site for over 50 years. In addition to this, a large volume of hazardous electroplating wastes has been collected and stored on the site.

In February 2015, a fire broke out on the site. Since then, WorkSafe and the Environmental Protection Authority have been working with the site owner to bring it into compliance.

A preliminary site investigation which took place in June 2016 has indicated that the soil on the site may be contaminated from the electroplating works and hazardous waste stored on the site.

The next step is for the site to be cleared of hazardous wastes so a detailed site investigation can be undertaken.

6.  Onehunga Aquifer

Location

Onehunga, Auckland

Council

Auckland Council

Site description

The former New Zealand Farmers Fertiliser Works operated from 1910 to 1984. It manufactured, stored and handled fertiliser products. Contamination of the site, the groundwater and surface water was caused by on-site storage of raw material and effluent. Off-site discharges of effluent have also effected nearby waterways including the Miami Stream and Manukau Harbour. The CSRF previously contributed $615,655 towards total project costs of $1.023 M for an investigation of the site.

The next step is for the Ministry for the Environment and Auckland Council to discuss options for further investigation and/or remediation. 

7.  Rotowaro Carbonisation Plant

Location

Rotowaro, Waikato

Landowner

Public Trust

Council

Waikato Regional Council

Site description

From the late 1930s until 1985, Waikato Carbonisation Limited made coke, coal tar and creosote from coal at its Rotowaro plant near Huntly. There were few controls on the use of dangerous substances and waste was discharged with little or no treatment.

During the 1980s, efforts were made with no success to find other ways to dispose of the waste water. Industrial rubbish and derelict equipment, waste oils and tar littered the site. Run-off carried phenols, ammonia and hydrocarbons into the Awaroa stream.

After a fire in 1985 the company went into voluntary liquidation. The site was abandoned which means it now presents serious risks to peoples’ health.

The next step is for the Ministry for the Environment and Waikato Regional Council to discuss options for remediation. The CSRF has previously contributed $202,699 towards total costs of $299,699 for site investigations and assessing remedial options. A 2008 cost estimate indicates that there will be a significant cost involved in ensuring stored contaminants on site do not have a significant adverse effect on the Awaroa Stream and do not pose an unacceptable health risk to people who might visit the site.

8.  Te Mome Stream

Location

Seaview, Lower Hutt

Council

Greater Wellington Regional Council

Site description

The Te Mome Stream is an isolated tributary of the Hutt River. It receives large amounts of storm water from the Hutt Valley catchment and discharges from adjacent industries. The sediment of the stream contains high concentrations of heavy metals very similar to those found in the Waiwhetu Stream which was remediated through the CSRF. The Exide battery reprocessing plant was located near to Te Mome Stream and appears to be the main source of the heavy metal contamination although other industries cannot be ruled out as contaminant sources. The Te Mome Stream discharges into the Hutt River and the Wellington Harbour.

The next step is for the Ministry for the Environment and Greater Wellington Regional Council to discuss options for further investigation and/or remediation.

9.  Miramar Gasworks

Location Greater Wellington Regional Council

Council

Mirimar, Wellington

Site description

The Wellington Gas Company operated a coal gas plant on the site between 1915 and 1972. Following the demolition of the plant in 1972, the site was subdivided for industrial development and properties were sold to private purchasers.

The former gasworks site is contaminated by a variety of organic compounds including polyaromatic hydrocarbons and benzene that are typical of gasworks waste. There is also some risk to the environment as a result of contaminated groundwater entering the storm water system and discharging into the Wellington Harbour.

The next step is for the Ministry for the Environment and the Greater Wellington Regional Council to discuss options for further investigation.

10.  Dunedin Gasworks

Location

Dunedin

Landowner

Dunedin City Council

Council

Otago Regional Council

Site description

The Dunedin Gasworks operated between 1863 and 1987. Following the plant’s closure the land was partially cleared and subdivided into land for commercial use.

There is an underground tar well on the site containing a large volume of tar and related byproducts. There is also the potential of soil contamination across the site. The site was partially remediated in 2005 by sealing the area with asphalt and public access to the site is restricted, however recent testing has indicated there is a potential risk of contamination to local stormwater networks from the site.

The next step is for Dunedin City Council and the Ministry for the Environment to discuss options for further investigation and/or remediation.

Note

Project cost refers only to project phases (site investigation, remedial planning, and/or remediation) that have had CSRF funding approved. Total estimated remedial costs for the project are not included unless an application for the remediation phase has been approved.

Find out more

For further information on a site on the CSRF Priority List please contact the relevant regional council.

Reviewed:
11/07/16