Environment Report - Santos

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Executive Summary Table 1 <strong>Environment</strong>al mitigation and management measures Element Potential Issue/Impact Proposed Mitigation and Management Measure Bathymetry and oceanography Marine ecology Commercial fisheries Landform and Soils Pipeline stability on the seabed Spanning of pipeline Effect on sea water quality and aquatic habitats Impacts of project-generated noise on marine animals Effects on fishery operations Wind and water erosion Pipeline will be weighted (concrete coating or thicker wall steel pipe) to provide onbottom stability Pipeline route was selected to avoid significant spans Grout-filled bladders will fill minor spans to support pipeline Pipeline will be surveyed and retrospective maintenance as necessary to address pipeline spanning Offshore pipeline is aligned to avoid key reef habitats and predominantly traverse sandy seabed HDD will be employed for the shore crossing to avoid impacts to nearshore reef and coastal habitat Oil spill contingency response plan implemented for exploration drilling will be expanded to include all field development and operation activities Strict vessel refuelling procedures will be employed to prevent spillage at sea A waste management strategy will be developed for all marine activities based on Australian and international standards Vessels will comply with standard requirements for the prevention of the introduction of pests Low toxicity, water-based drilling fluid additives will be used HDD fluid discharge to the marine environment will be minimised Hydrostatic test water will be low-toxicity and discharged from the Casino 5 wellhead over a four-day period to ensure further dilution and dispersion Protocols will be developed in accordance with EPBC regulations to minimise interaction with whales during construction and drilling Construction will minimise or avoid the types of vessel and aircraft movements that are known to elicit disturbance reactions Aerial observations will be undertaken to monitor whale activity during the period leading up to and during the drilling program, where it coincides with whale migration or presence Helicopters will be flown at a minimum altitude of 1,000 m over ocean Watch will be maintained for whales in the vicinity of vessel activities during pipelaying such that responses including reduction of speed, minimisation of sonar use, and instructions to helicopter pilots/ancillary vessels to avoid whales can be implemented Offshore pipeline is aligned to avoid key fishing areas HDD will be employed for the shore crossing to avoid impacts to nearshore lobster and abalone habitat 500-m radius exclusions zones will be implemented during construction (well sites and pipelay vessel) and operation (wellheads only) to minimise collision risk and gear loss Digital information on position of wellheads and subsea pipeline will be provided to commercial fishers Location, timing and duration of construction activities will be communicated with commercial fishers A gear retrieval or replacement policy will be implemented where it becomes snagged on project infrastructure Construction is scheduled for the drier months of the year and activity will be limited during heavy rain Maximum coverage of vegetation will be retained and rehabilitated expeditiously A special crossing crew will construct the Campbells Creek crossing and will retain a vegetation buffer on the banks and approach slopes, reinstate immediately following pipelay using appropriate stabilisation measures and undertake additional revegetation to enhance the riparian corridor Erosion and sediment control measures will be installed and maintained during construction and operations The pipeline easement will be monitored for erosion, sedimentation and stability xvi Casino Gas Field Development
Executive Summary Table 1 <strong>Environment</strong>al mitigation and management measures (cont’d) Element Potential Issue/Impact Proposed Mitigation and Management Measure Landform and Soils (cont’d) Hydrology and hydrogeology Terrestrial ecology Slope instability Soil inversion, compaction and subsidence Soil contamination Disturbance to significant features Water quality Disruption to water flow regimes Clearing of remnant native vegetation and loss of significant flora and fauna with consequent biodiversity and conservation impacts Onshore pipeline alignment was selected to avoid areas of significant slope instability and slumping Topsoil will be stripped and stockpiled separately to trench spoil Soils will be reinstated in the reverse order of excavation to avoid inversion of soil profiles Construction ROW access during or immediately after heavy rain will be limited Trench backfill will be compacted and if necessary a raised crown will be installed (less than 20 cm) over the trench to mitigate subsidence Soils will be scarified to relieve compaction, where necessary Temporary and permanent storage of fuels, lube oils and other hazardous chemicals will be within areas or facilities designed to contain spills Appropriate hazardous chemical handling procedures will be implemented Appropriate measures to prevent third party rupture of the MEG pipeline will be implemented including pipeline marker signs, in-trench marker tape and appropriate depth of burial A spill contingency response plan will be developed and implemented HDD will be employed for the shore crossing to avoid surface impacts to coastal landforms Construction is scheduled for the driest months of the year The Campbells Creek crossing will be constructed during period of nil to low flow, where practicable or employ stream flow diversion measures (flume or dam and pump) to minimise sediment release The pipeline will be buried at a greater depth at the Campbells Creek crossing to minimise risk of scour Stockpiles will be placed more than 10 m from the top-of-bank at Campbells Creek Temporary and permanent storage of fuels, lubes and other hazardous chemicals will be within areas or facilities designed to contain spills Appropriate hazardous chemical handling procedures will be implemented (e.g., no refuelling of machinery and equipment within 20 m of Campbells Creek) A spill contingency response plan will be developed and implemented A raised crown will be installed over the trench to compensate for subsidence and crown breaks created every 30 m to prevent impedance of surface flows The Campbells Creek crossing will be constructed during nil to low flow, where practicable or stream flow diversion measures employed (flume or dam and pump) to maintain flow Positive HDD fluid pressure will be maintained during drilling and the drill hole cased to prevent preferential flow of groundwater along the drill hole HDD shore crossing will drill under the surface of Port Campbell National Park and Great Ocean Road avoiding native vegetation clearance Temporary access to the HDD site will be selected based on a targeted search for rare or endangered species to avoid any that may be present, where practicable. The access will be revegetated with local native species following construction to reflect the existing ecological vegetation class (EVC) The pipeline route is aligned through open farmland and traverses native vegetation at two minor road crossings only where it is aligned through degraded native vegetation. The ROW will be narrowed from 24-m down to 5-m at these road crossings Impacts to native vegetation within the Port Campbell National Park to enable temporary surface placement of the HDD sensing cable will be kept to an absolute minimum, involve hand trimming only, include restoration of any disturbed areas and be undertaken in consultation with Parks Victoria. Casino Gas Field Development xvii
Page 1 and 2: Environment Report Casino Gas Field
Page 3: Preface The Casino Gas Field Develo
Page 6 and 7: Executive Summary TXU WUGS facility
Page 8 and 9: Executive Summary ment from the Cas
Page 10 and 11: Executive Summary 9 8 N Casino offs
Page 12 and 13: Executive Summary 668 000 670 000 6
Page 14 and 15: Executive Summary Alignment of the
Page 18 and 19: Executive Summary Table 1 Environme
Page 20 and 21: Executive Summary xx Casino Gas Fie
Page 22 and 23: Contents 4.3.4 Commercial Benefits
Page 24 and 25: Contents 6.15.1 Existing Environmen
Page 26 and 27: Contents 6.3 Locations of commercia
Page 28 and 29: Contents xxviii Casino Gas Field De
Page 30 and 31: 1. Introduction 640 000 650 000 660
Page 32 and 33: 1. Introduction • Provision of an
Page 34 and 35: 2. Regulatory Framework • Commonw
Page 36 and 37: 2. Regulatory Framework Santos has
Page 38 and 39: 2. Regulatory Framework 10 Casino G
Page 40 and 41: 3. Stakeholder Consultation Table 3
Page 42 and 43: 3. Stakeholder Consultation This re
Page 44 and 45: 4. Project Rationale ability to sto
Page 46 and 47: 4. Project Rationale mary energy so
Page 48 and 49: 5. Project Description network. A n
Page 50 and 51: 5. Project Description 640 000 650
Page 52 and 53: 5. Project Description Proposed Otw
Page 54 and 55: 5. Project Description Table 5.3 As
Page 56 and 57: 5. Project Description 668 000 670
Page 58 and 59: 5. Project Description and hydrauli
Page 60 and 61: 5. Project Description with a ‘pu
Page 62 and 63: 5. Project Description HDD Profile
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5. Project Description Enesar Court
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5. Project Description move weld de
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5. Project Description tion contrac
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5. Project Description corrosion in
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6. Impact Assessment 10.3 m (WNI, 2
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6. Impact Assessment 9 8 Flaxman's
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6. Impact Assessment 640 000 650 00
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6. Impact Assessment Drill Fluid an
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6. Impact Assessment coated or thic
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6. Impact Assessment mammals such a
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6. Impact Assessment noise were red
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6. Impact Assessment Physiological
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6. Impact Assessment SIV, 2003). Ke
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6. Impact Assessment the proposed s
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6. Impact Assessment Table 6.4 Geol
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6. Impact Assessment • Route plan
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6. Impact Assessment Project, Santo
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6. Impact Assessment 668000 670000
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6. Impact Assessment Park and Loch
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6. Impact Assessment side native ve
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6. Impact Assessment Curdie Vale -
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6. Impact Assessment Habitat Loss.
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6. Impact Assessment Table 6.9 Pote
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6. Impact Assessment 6.9.5 Residual
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o 6. Impact Assessment 630000 65000
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6. Impact Assessment Electricity. P
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6. Impact Assessment will be requir
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6. Impact Assessment requirements.
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6. Impact Assessment of the project
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6. Impact Assessment 6.13.2 Potenti
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6. Impact Assessment will be contra
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6. Impact Assessment dicted noise l
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6. Impact Assessment occupants of R
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6. Impact Assessment • Minimising
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6. Impact Assessment - Pipeline mon
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7. Environmental Management Framewo
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8. References CSC. 2004c. Industry.
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8. References Force on Marine Prote
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9. Glossary laydown area: sites at
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Appendix 1 Appendix 1 - Terrestrial
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Appendix 1 List of flora species th
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Appendix 1 Status List of flora spe
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Appendix 1 List of fauna species th
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Appendix 1 List of fauna species th
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Appendix 2 Santos Environment, Heal
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INTRODUCTION Introduction Message f
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2 > FRAMEWORK EHSMS Framework The S
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4 > MANAGEMENT STANDARDS EHSMS 01 |
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6 > MANAGEMENT STANDARDS EHSMS 05 M
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8 > MANAGEMENT STANDARDS EHSMS 07 M
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unless otherwise stated, be based o
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12 > MANAGEMENT STANDARDS EHSMS 10
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22 > HAZARD STANDARDS Hazard Standa
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24 > GLOSSARY Glossary EHSMS Perfor
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Santos Head Office Santos House 91
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Environment Report - Santos

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