Contaminated Site Remediation and Why It Matters
If you believe your land may be contaminated, this guide has the information you need.
In NSW, given our industrial legacy, it’s not surprising that many sites have contaminated soil. Urban expansion pressures and the resulting need for safe land reuse mean there is ongoing demand for contaminated site remediation.
Learn what site remediation actually means, the various approaches to decontaminate soil and discover the step-by-step process followed by a professional team, so you will know exactly what is happening during each phase of your project.
What Is Contaminated Site Remediation?
Site remediation is the process of removing or neutralising pollutants from soil. It often covers more than just soil, with vapour and surface materials all involved and groundwater remediation may be required, too.
Contamination cannot simply be left in place due to health risks and potential issues with local water supplies
When Is Remediation Required?
- Any applications for site development that require a site audit for approval
- Sites already identified by the NSW Environmental Protection Agency (EPA) as regulated.
- If contamination is discovered during excavation or demolition works
- Part of the standard due diligence requirements before property purchase
Common Pollutants Found in NSW Soils
Some commonly-found contaminants on NSW sites, particularly in industrial, commercial, and former manufacturing areas, include:
- Petroleum hydrocarbons, from fuel spills or former service stations
- Heavy metals such as lead, arsenic, and mercury from former industrial and mining sites
- Asbestos was a hugely popular construction material and is still present in many pre-1990 buildings
- Volatile organic compounds (VOCs) from dry cleaners or solvents
- Chemicals and pesticide residues in rural, previously agricultural land
How Do Contaminants Spread?
Pollutants from untreated land can easily move through the environment. For example:
- Contaminants may leach through soil into groundwater
- Vapour migration into buildings above contaminated plumes
- Surface water carrying contaminants can run off to local waterways
- Contaminated fill can be disturbed by wind erosion
Why Soil Remediation in Sydney and NSW Matters
Sydney’s industrial past has left many brownfield sites. They need to be cleaned up before redevelopment for housing, business, or community use. This work is essential to reduce the health risks posed by untreated contaminated land, including respiratory, neurological, and carcinogenic risks from exposure, as well as potential environmental impacts on waterways, including drinking water catchments.
Regulatory Framework in NSW
- The NSW Environmental Protection Agency (EPA) regulates contaminated sites.
- The landowner should also be aware of
- The Contaminated Land Management Act 1997 (NSW)
- State Environmental Planning Policy (Resilience and Hazards) 2021
- There are penalties and liability for non-compliance
Key Methods Used in Site Remediation
Common remediation techniques utilised in NSW include:
- Excavation and disposal
- The physical removal of contaminated soil for disposal at an accredited facility
- In-situ treatment
- Soil and groundwater are treated in place without excavation, normally via chemical stabilisation or bioremediation
- Bioremediation
- The use of microorganisms to break down organic contaminants
- Soil washing
- Literally washing the soil, with water or chemical solutions to extract pollutants from the soil
- Groundwater pump-and-treat
- Treating contaminated groundwater to make it safe for use
Choosing the Right Approach
The appropriate method depends on site-specific factors. This is why professional assessment is essential. The factors considered may be:
- The type and concentration of contaminant
- Current conditions of soil and groundwater, plus the intended future land use
- Regulatory requirements and acceptable outcomes
Our 5-Step Site Remediation Process
A professional approach to soil remediation in Sydney helps ensure a safe and successful project. This run-through of the standard 5-step process will help you understand what is happening during each phase
Site Assessment and Contamination Investigation
- The initial site assessment, often preceded by a review of previous land use
- Soil and groundwater samples are taken from across the site at different depths
- The samples are sent for laboratory analysis and contaminant mapping
Remediation Planning
- Your team will develop a site-specific Remedial Action Plan (RAP)
- This will include the target remediation levels
- The remediation method is selected
- The planning phase will suggest project timelines and generate a free quote
Remediation Works
- Get any equipment needed and human resources on site
- Begin work, using the approved remediation method (excavation, treatment, containment, etc.)
- Waste should be classified, transported, and disposed of in accordance with NSW EPA requirements
- Air and water quality are monitored throughout
Validation and Verification
- Post-remediation soil and groundwater sampling
- Samples are again tested and compared with the agreed remediation targets
- A validation Report is prepared for submission to the relevant regulatory bodies
- An independent site audit may be required under NSW legislation
Site Sign-off and Handover
- The site is inspected, and the project is declared successful and complete
- Documentation and records are provided for the landowner or future developer
- The site is formally handed over, ready for development, sale, or occupation
Work With a Trusted NSW Remediation Specialist
At Rapid Demolition, we have years of experience working across industrial, commercial, and residential sites in NSW. We are committed to EPA compliance and safe, efficient NSW site remediation outcomes.
Find out more about our site remediation services.
Contact our friendly, expert team today with your plans and questions and arrange your site visit to begin planning your contaminated site remediation.
