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Public Information Booklet Figure 42: Creeks and catchment areas Waste Water Management Questions: � What discharges are there? � How will sewage be dealt with? � What is the waste management plan of the gas plant? � With respect to waste and waste disposal - what waste can be expected and how will it be dealt with? Waste LNG processing creates a relatively small amount of solid waste compared to other industrial processes. The majority of the waste generated is domestic type waste (e.g. plastics, cans, metal, paper and cardboard). Some hazardous waste will also be generated (e.g. mercury and oil contaminated filters, grease, empty chemical containers, batteries, fluorescent lights, spent solvents, paints, etc). The development will mostly make use of existing waste management services, for example a local land fill site (following liaison with the Shire of Broome on capacity). Non- 5279225 73
Public Information Booklet hazardous wastes will typically be directed to landfill. Recycling will be pursued where possible. All hazardous materials will be recorded, tracked, segregated from other waste streams and stored in suitable containers. Hazardous wastes will be disposed of via existing, approved hazardous waste reception facilities. Waste water management Waste water management will be designed to minimise the risk of any environmental harm and where possible, re-use and recycle of waste water streams. Discharges to freshwater bodies will be limited to standard rainfall runoff from non-contaminated areas of the facility, for example offices and accommodation blocks, which may drain to natural, existing water channels within the lease site and exit to the sea. This discharge poses negligible if any environmental risk. The LNG plant will be designed and operated to ensure that all spills and leaks are contained (within a bunded area) and contaminated storm water captured to ensure that there will be no impacts on the quality of the groundwater. Examples of bunding include concrete curbing and drainage systems around equipment and large linings covering the ground and around storage tanks which will hold the full volume of the storage tank. Collected waste water including which may include treated sewage and grey water, rainfall runoff from potentially contaminated and non-contaminated areas, machinery wash down water and the brine waste water from desalination processes will be treated to a high standard. This treated waste water will be discharged to sea in a controlled manner and tested to meet stringent water quality standards consistent with Australian guidelines before being discharged at an appropriate location. The exact discharge location will be based on an environmental impact assessment to help determine the best location for any outfall to minimise any risk of environmental impact. However it is anticipated that the outfall would be located 2 to 3 kilometres (1.2 to 1.9 miles) offshore. An outfall is specifically designed to maximise the amount of mixing so that the water is the same as background levels within tens of metres of where it is put back into the ocean due to the high quality water treatment that will be used. The management of waste water will be subject to an Environmental Impact Assessment and approval by the government via the Strategic Assessment process. Question ñ If there are any bilge and/or oil spills, how will these be managed? There are laws in place which detail the standard to which vessels and facilities are to be designed and maintained to minimise the risk of spills. To prevent spills, measures will be in place for all activities on vessels and for land based facilities during the construction and operation phases. This includes the use of leak detection equipment, procedures for refuelling and transfers. For onshore, and on the jetties, bunding is used to contain spills. Examples of bunding include concrete curbing and drainage systems around equipment and large linings covering the ground and around storage tanks which will hold the full volume of the storage tank. All vessels that enter the port will be compliant with the International Maritime Organisation requirements. The condensate (light oil) tankers and LNG carriers will be double hulled to minimise the risk of a spill even in the unlikely event of grounding. 5279225 74
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