Project Description

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Point Cook RAAF Base remediation.

Client: Point Cook RAAF Base Remediation
Timeframe: 2 years
Value: $30m
Location: Point Cook, Victoria

Overview

RAAF Base Williams, former Fire Training Area (FTA), Point Cook, was one of the most significant remediation projects undertaken in Victoria from both a historical and environmental perspective. Located at the longest continuously operating military airfield in the world, the base is included on the Commonwealth Heritage List.

Historical firefighting training activities had significantly tainted the underlying soil and groundwater, contaminating it with organic hydrocarbons including DNAPL, LNAPL and dissolved phase contamination.

In 2013, the Commonwealth of Australia (Department of Defence) selected Enviropacific Services as the remediation contractor for the site, which included the preparation and remediation of the site.

Between 2013 and 2015, over 70,000 tonnes of highly contaminated soils were excavated on site, treated by ex situ direct fired thermal desorption technology, and reinstated on site in validated excavation cells.

More than 15 million litres of dissolved phase contaminated groundwater was treated by a multifaceted water treatment system.

The project was delivered on time, and met all environmental and regulatory expectations.

Summary

• Excavation of more than 70,000 tonnes of chlorinated hydrocarbon contaminated soil, including DNAPL, LNAPL and dissolved phase contamination.
• Construction and commissioning of 30 tonnes per hour direct-fired thermal desorption plant.
• Thermal treatment of soil for 12 primary contaminants of interest to below USEPA regional screening levels.
• Construction of environmental enclosures to manage fugitive emissions and contaminated atmosphere, with three individual emissions control systems.
• Comprehensive occupational monitoring program including full-face respirators, summa cannisters, real-time monitoring of personal PID toxiraes, and ongoing health checks.
• Development of all work plans, procedures, monitoring and compliance reports.
• Installation of more than 1 km of sheet piles to depth of marine clay for dewatering of excavations.
• Construction and commissioning of water treatment plant to treat more than 15,000kL of dissolved phase contaminated groundwater.
• Water discharge criteria ANZECC 2000, 95% species protection criteria for a marine setting.
• Backfill and compaction of treated soil into validated excavations.
• Revegetation and demobilisation from site.