The Problem:
A former commercial site with historical petroleum impacts is under a long term environmental management plan. The plan requires scheduled groundwater monitoring to confirm that natural attenuation continues to reduce risk and that the plume remains stable. The brief was to complete the 2025 rounds safely and efficiently, keep regulators satisfied, and set up the program for biannual monitoring from 2026.
Project Summary:
iEnvi delivered a practical groundwater investigation program aligned with the Long Term EMP schedule. In 2025 we complete two quarterly rounds with environmental sampling at a selected network of existing monitoring wells. Fieldwork includes well gauging and field parameters, followed by Hydrasleeve sampling. Laboratory analysis targets VOC oxygenated compounds, TRH C6 to C16, BTEXN, and monitored natural attenuation parameters at a NATA accredited laboratory. Quality control includes a trip blank and rinsate blank. Results are compiled into a short groundwater monitoring and evaluation report with trend analysis and a comparison to the Bioscreen model to track plume behaviour and progress toward the long term objective. The program then transitions to biannual monitoring from 2026 in line with the EMP.
Solution & Benefit:
The program confirms if natural attenuation continues to perform and provides clear triggers for any future optimisation. The approach supports compliance and keeps the path open for a Clean Up to the Extent Practicable review later in the EMP. For the asset team it means reliable data, fewer surprises, and a smooth shift to biannual rounds from 2026. Services delivered include groundwater investigation, environmental sampling, contaminated land investigation, and petroleum focused analysis.
