Environmental Hazard & Source Known and Potential Impact Controls Residual Risk Planned Activities Seabed Disturbance Erosion / sediment build up due to infrastructure Dropped objects during IMR activities Temporary placement of subsea infrastructure on seabed during IMR activities Vessel anchoring during IMR activities Span rectification activities Localised disturbance or loss of benthic habitat Localised turbidity of the column Sensitive receptors identified and avoided Sponge and bryozoan habitat at ~ 50 m depth along the pipeline identified and communicated to IMR project team. IMR Program Work Plan IMR Program Work Plan includes no equipment laydown or anchoring within sponge and bryozoan habitat at ~ 50 m depth along the pipeline. Chemical Assessment Process Santos Offshore Chemical Assessment Process used to assess and approve grout to be used in grout bags. Very Low (1) Underwater Noise Vessel engines, thrusters and ROV Behavioural changes in Localised avoidance. Vessel/Cetacean Caution Zones Vessels will travel at less than 6 knots within the caution zone of a cetacean (150 m radius for dolphins, 300 m for whales). Very Low (1) Light Emissions IMR vessel activities Localised fauna attraction Vessel lighting requirements External vessel lighting meets the requirements of the AMSA Marine Orders Part 30 (Prevention of Collisions). Very Low (1) Atmospheric Emissions Combustion of fuel from vessel engines, deck equipment Incineration of waste Localised and temporary decrease in air quality Contribution to global greenhouse gas effect Marine diesel quality Low-sulphur marine diesel used as primary fuel source. Equipment maintenance Combustion equipment maintained in accordance with Planned Maintenance System. Air Pollution Certificate Vessels with gross tonnage > 400 t have International Air Pollution Certificate (IAPP). Incinerator certificate Very Low (1)
Cetacean Interactions IMR vessel activities Injury and/or death from vessel strike. Vessel/Cetacean Requirements Vessels will travel at less than 6 knots within the caution zone of a cetacean (150 m radius for dolphins, 300 m for whales). Very Low (1) Marine Users Interactions Physical presence of the Patricia Baleen and pipelines and IMR vessels Damage to fishing equipment. Loss of commercial fish catches. Vessel collision Navigational requirements Patricia Baleen wellheads and pipeline are marked on navigation charts. Wellheads have a 500m exclusion zone. certificate demonstrates vessel complies with the Navigation Act 2012 and applicable Marine Orders. Notifications Notice to Mariners and communication to relevant commercial fishers provided prior to commencement of IMR works. Training Vessel Master, First Mate and Second Mate have a valid Standards of Training, Certification and Watchkeeping (STCW) certificate. Very Low (1) Introduction of Invasive Marine Species Vessel ballast water discharge containing foreign species. Biofouling of vessel hull or ROV equipment. The survival, colonisation and spread of foreign species that may compete with native species for resources, reducing species diversity and abundance. AQIS requirements Overseas vessels contracted receive AQIS clearance to enter Australian waters. Victorian Ballast Water requirements Vessels entering Victorian waters and visiting a Victorian Port complete and submit Victorian Ballast Water Report Form to EPA. If discharging ballast in Victorian waters approval obtained from EPA prior to discharge. ROV inspection Pre-use inspection records include requirement for checking and removing biofouling. Very Low (1) Minor spills from vessel, ROV or IMR activities Vessel hydraulic hose leak effects to the marine environment including marine fauna and benthic habitats. Containment Equipment, chemicals and hydrocarbons with the potential for spillage are contained. Very Low (1)