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Case Studies

Remediation of the Former Colac Gasworks for TXU

February 12, 2024
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The EESI team addressed significant contamination at the TXU site in Colac, Victoria. This site, historically used for gasworks from 1886 to 1962, was contaminated primarily with polyaromatic hydrocarbons (PAHs), total petroleum hydrocarbons (TPHs), and other substances like BTEX, phenol, cyanide, and lead. The extent of contamination reached depths of up to 10 metres and spread across an area of about 8600 m².

The Solution

EESI's remediation, starting in May 2003, adhered to a detailed Remediation Action Plan (RAP) and a health and safety plan. The process involved excavating 8000m³ of soil, with some areas going as deep as 10 metres to ensure comprehensive contaminant removal. The contaminated soil, rich in coal tar, underwent treatment through phyto-assisted remediation and bioremediation techniques. This approach effectively reduced concentrations of PAHs, TPHs, and phenols.

The team faced challenges such as limited space for bioremediation and odour issues during excavation. These were managed effectively, considering the site's proximity to the town centre and the need to minimise disruption to the local community. Regular communication with the community and nearby residents was maintained to keep them informed about the project's progress.

The Benefits

The bioremediation achieved a 100% success rate, markedly reducing hazardous contaminant levels and rendering the soil suitable for reuse. This project transformed a site with a history of contamination into an area viable for commercial retail development. The remediation met the criteria of a Statutory Environmental Audit, conducted under the supervision of the EPA and an Auditor, ensuring compliance with environmental regulations and safety standards.

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The Environmental Earth Sciences International Group acknowledges the Traditional Custodians of country throughout Australia and their connections to land, sea and community. We pay our respect to their Elders past, present and emerging and extend that respect to all Aboriginal and Torres Strait Islander peoples today.