Environmental Advisors assessed off-site environmental harm from a closed Landfill listed on the Environmental Management Register. Engaged by the owner, we provided clarity of the leachate generation and impact upon the adjacent Oxley Creek to address a Notice issued by the Regulator. We designed and implemented a surface water quality monitoring program to support the up and down stream risk assessment. A Leachate Management Plan was implemented involving minor works to channel and collect leachate, with options for leachate disposal on or off site, including under a Trade Waste Agreement.