Soil Investigation Clears Path for Safe Construction at Chemical Site, Victoria

Project overview

iEnvi completed an in‑situ waste classification and targeted contamination investigation to enable excavation and construction of a new flammable goods storage zone at an industrial chemical site in Melbourne, Victoria. The works supported excavation of approximately 2,000 m³ of soil and followed the site Environmental Management Plan (EMP) and relevant EPA Victoria requirements.

What we did

• Reviewed historical site records and previous investigation data to focus sampling and manage likely contaminants.
• Excavated seven test pits (plus locations from previous investigations) and collected 21 new soil samples for laboratory analysis.
• Applied higher sampling density in areas with suspected bonded asbestos and completed visual asbestos inspections and gravimetric sampling.
• Analysed soil samples for heavy metals, hydrocarbons, pesticides, PCBs, PFAS and asbestos fibres; conducted ASLP leachability testing where needed to assess mobility of contaminants.
• Managed unexpected materials under the EMP unexpected‑finds protocol with fast turnaround confirmatory testing.
• Prepared a formal waste classification report with handling, transport and disposal instructions for the client and receiving facilities.

Key findings

• Low levels of bonded asbestos were identified and delineated; soil was managed as priority waste where required.
• Analytical testing identified moderately elevated fluoride in some samples; no other contaminant ‘signature’ chemicals linked to historic chemical distribution or former agricultural use were detected at levels that prevented lawful off‑site classification as non‑hazardous fill or other categories defined by EPA Victoria.
• ASLP leach testing confirmed low leachability of contaminants of concern, supporting decisions on disposal or reuse and informing landfill acceptance criteria.
• Some excavated material was odorous but, following leach and laboratory analyses, was considered chemically innocuous and managed on the basis of aesthetic and handling controls rather than additional hazardous‑waste disposal requirements.

Practical benefits to the client

• Clear, compliant pathway to proceed with excavation and construction without unnecessary delays or conservative disposal costs.
• Rapid testing of unexpected finds under the EMP avoided prolonged work stoppages and reduced contingency disposal volumes.
• Detailed classification and handling instructions minimised contractor risk and ensured receiving facilities could accept the material where appropriate.

Risk and compliance notes

The investigation was tailored to meet EPA Victoria waste classification requirements for soils and asbestos. Where asbestos is present in soil, the material is treated as priority waste and must be managed, tracked and transported in line with EPA Victoria requirements and landfill acceptance criteria. ASLP leach testing was used to assess mobility of contaminants and support disposal or reuse decisions.

What this means for developers and site managers

• Early targeted testing reduces uncertainty and can significantly lower disposal costs by avoiding unnecessary classification as higher‑category waste.
• Having an EMP with an unexpected‑finds protocol and a rapid testing pathway in place reduces the commercial impact of discovering unusual or odorous materials during excavation.
• Clear classification reporting is essential for contracts, Waste Tracker transactions and landfill acceptance — plan these steps into your program and budget.

Takeaways

1. Design sampling programs to match regulatory guidance and site‑specific risk (higher density where asbestos is suspected).
2. Use leachability tests (for example ASLP) where mobility of contaminants could affect disposal or reuse options.
3. Prepare and implement an EMP unexpected‑finds protocol before excavation starts and confirm rapid testing arrangements with your consultant and laboratory.

Call to action: For pragmatic, compliant contaminated‑land investigations and waste classification that keep projects moving, contact iEnvi on 13000 43684 or visit our contact page to discuss your site.