Targeted contaminated land assessment and remediation planning for a multi storey residential development, reducing unnecessary excavation and disposal costs.
Previous site investigations at a multi storey residential development in North Sydney identified elevated levels of lead, along with friable asbestos within fill material. Initial recommendations proposed excavation and disposal of a minimum 800 mm of fill material across the entire site, representing a significant remediation cost early in the project.
Concerned about the financial and program implications, the developer engaged BBN Consulting to review the existing investigations and assess whether a more targeted remediation approach was achievable.
01. PROJECT CONSIDERATIONS
» Existing remediation recommendations were based on broad assumptions rather than clearly defined boundaries
» Additional sampling was required to accurately delineate the extent of lead and asbestos impacts
» Tight timeframes, with the client requiring rapid turnaround of sampling results and reporting to avoid delays to the program
02. VALUE DELIVERED
» Reduced proposed remediation costs by $160,000 compared to the earlier estimate
» Identified that contamination was likely limited to discrete hotspot areas
» Provided alternative remediation options to reduce unnecessary excavation and disposal
» Confirmed contamination was limited in extent through targeted delineation sampling
