Report - MRIR - Esso Australia Resources Pty Ltd

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Esso Australia Resources Pty Ltd submitted its Monthly Recordable Environmental Incidents report to NOPSEMA for April 2025, covering operations under three environment plans: Gippsland Basin Geophysical and Geotechnical Investigations, Bass Strait, and Jack-up Rig Plug and Abandonment. Two incidents were recorded. On 20 April, approximately 0.1 litres of hydraulic oil was released to sea from a dripping hose fitting on the Mulloway-1 jack-up rig, constituting a breach of the "no spills to environment" performance outcome. The fitting was replaced and other legs inspected; future fluorescent marking of hydraulic fittings was implemented to prevent recurrence. On 25 April, a welding blanket was knocked overboard during Bass Strait pack-up activities, breaching habitat impact limits for dropped objects. Both incidents