Cardno undertook significant site assessment and planning works to deliver on all the technical, commercial, compliance, and safety aspects including:
- Detailed site investigation involving test pitting, groundwater well installation, soil and groundwater sampling
- Delineation of hydrocarbons using Laser-Induced Fluorescence (LIF)
- Long-term groundwater monitoring and extensive aquifer testing
- Bench-scale remediation trials leading to on-site remediation trials, with the sand washing chosen as the final remediation technology
The remediation program itself was implemented with the assistance of EnviroPacific Solutions and involved the construction of a sand washing plant within a fully lined bund, two 1.6 ML water treatment ponds, associated settlement devices, and a 15L/s water treatment plant within a fully lined bund.
There have been some unique challenges:
- The site is in a remote location, 200 km from Melbourne
- The groundwater onsite is relatively shallow, with half of the impacted soil situated below the water table
- The site is adjacent to protected wetlands
Cardno and its contractor have implemented robust, innovative, and cost-effective solutions, which have resulted in 70,000 m3 of contaminated soil being excavated and remediated onsite – most of which has been treated using the sand washing plant, with lesser impacted soils treated via biopiling.
Significantly, the project has amassed more than 32,000 site work hours and at least 6,000 heavy equipment hours, with zero injuries. The project is expected to be completed by the end of the year.