The Problem:
A semi-rural property in north-west Sydney received imported fill that included construction and demolition waste. Asbestos-containing materials were found in surface stockpiles and spread areas. The regulator issued a Clean-Up Notice requiring the owner to identify the extent of waste, classify it, and remediate safely. Data gaps remained on depth and lateral extent of the waste and whether other contaminants were present.
Project Summary:
iEnvi designed a targeted program to rapidly close data gaps and move the site toward compliance. The plan included test pits using an excavator, photo logs, and detailed field notes. Sampling occurred at half-metre intervals with both gravimetric and 500 mL asbestos fines and friable asbestos samples for laboratory analysis. A limited suite of environmental sampling for waste classification was included. This covered metals, polycyclic aromatic hydrocarbons, total recoverable hydrocarbons, organochlorine and organophosphate pesticides, polychlorinated biphenyls, and PFAS as required.
The approach aligns with NEPM 2013, NSW EPA Waste Classification Guidelines, the NSW EPA Sampling Design Guidelines, and SafeWork NSW codes. A Remedial Action Plan will be prepared and signed by a Certified Environmental Practitioner Site Contamination Specialist. Validation sampling and a validation report will confirm outcomes. This work functions as a targeted contaminated land investigation and a focused DSI to support waste classification, asbestos in soil risk assessment, and remediation planning.
Solution & Benefit:
The solution prioritises smart delineation to minimise excavation and disposal. iEnvi will consider emu-picking and screening to reduce waste volumes and enable lawful recycling or reuse where appropriate. The plan delivers a clear pathway from investigation to RAP to validation. Stakeholders gain regulatory confidence, lower disposal costs, safer conditions for site users, and a faster return to normal land use.
