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Wheatstone Project Offshore Facilities and Produced Formation Water Discharge Management Plan: Stage 1

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Wheatstone Project Offshore Facilities and Produced Formation Water Discharge Management Plan: Stage 1 Wheatstone Project Offshore Facilities and Produced Formation Water Discharge Management Plan: Stage 1 Document No: WS0-0000-HES-PLN-CVX-000-00101-000 Revision: 2 Revision Date: 21-Dec-2015 IP Security: Public © Chevron Australia Pty Ltd Wheatstone Project Document No: WS0-0000-HES-PLN-CVX-000-00101-000 Offshore Facilities and Produced Formation Water Discharge Revision: 2 Management Plan: Stage 1 Revision Date: 21/12/2015 TABLE OF CONTENTS ACRONYMS, ABBREVIATIONS AND TERMINOLOGY ........................................................ 3 1.0 BACKGROUND .............................................................................................................. 5 1.1 Project Overview ................................................................................................... 5 1.2 Proponent .............................................................................................................. 5 1.3 Environmental Approvals ....................................................................................... 7 1.4 Objectives .............................................................................................................. 7 1.5 Scope .................................................................................................................... 8 1.6 Public Availability ................................................................................................... 8 2.0 PROJECT DESCRIPTION ............................................................................................. 9 2.1 Overview ................................................................................................................ 9 2.2 Chemical Selection Process .................................................................................. 9 2.3 Trunkline Flooding, Cleaning and Gauging ......................................................... 10 2.3.1 Flooding ................................................................................................. 10 2.3.2 Flooding Fluids ...................................................................................... 11 2.4 Trunkline Hydrotest ............................................................................................. 12 2.5 Trunkline Dewatering ........................................................................................... 13 3.0 EXISTING ENVIRONMENT .......................................................................................... 15 3.1 Oceanography and Water Quality ....................................................................... 15 3.2 Geomorphology & Benthic Habitats .................................................................... 17 3.3 Fish and Marine Fauna ........................................................................................ 17 4.0 ENVIRONMENTAL RISK ASSESSMENT ................................................................... 19 4.1 Risk Assessment Approach ................................................................................. 19 4.2 Discharge Characterisation ................................................................................. 20 4.2.1 Toxicity ................................................................................................... 20 4.2.2 Dispersion .............................................................................................. 21 4.3 Potential Impacts ................................................................................................. 23 4.3.1 Physical impacts .................................................................................... 24 4.3.2 Toxicity Impacts ..................................................................................... 24 4.4 Risk Assessment Summary ................................................................................. 24 5.0 ENVIRONMENTAL MANAGEMENT, MONITORING AND REPORTING ................... 26 5.1 Management Measures ....................................................................................... 26 5.2 Triggers and Corrective Actions .......................................................................... 26 5.3 Monitoring ............................................................................................................ 27 5.4 Hind-Cast Modelling ............................................................................................ 29 5.5 Reporting ............................................................................................................. 29 6.0 REFERENCES ............................................................................................................. 30 © Chevron Australia Pty Ltd Public Page 1 Printed Date: 14/1/2016 Uncontrolled when printed Wheatstone Project Document No: WS0-0000-HES-PLN-CVX-000-00101-000 Offshore Facilities and Produced Formation Water Discharge Revision: 2 Management Plan: Stage 1 Revision Date: 21/12/2015 TABLES Table 1.1: Requirements of Commonwealth Ministerial Conditions: EPBC 2008/4469 relevant to this Plan ............................................................................................. 7 Table 2.1: Summary of Flooding Fluid Concentrations Pumped into the Trunkline ............... 11 Table 2.2: Summary of Flooding Fluids Discharged from Trunkline into Commonwealth Waters following Hydrotesting Activities ............................................................ 13 Table 2.3: Summary of Flooding Fluid Discharge from Trunkline into Commonwealth Waters during Dewatering ................................................................................. 13 Table 4.1: Species protection concentrations for Hydrosure 0-3670R based on the NOEC* SSD from WET testing ......................................................................... 20 Table 4.2: Summary Risk Assessment outcomes for the dewatering of Trunkline following FCG and Hydrotesting ........................................................................ 25 Table 5.1: FCGT and Trunkline Dewatering Management Actions or Standards .................. 26 Table 5.2: Monitoring Parameters and Criteria ...................................................................... 28 FIGURES Figure 1.1: Planned Location of Project Infrastructure ............................................................. 6 Figure 2.1: Schematic of a Trunkline FCG PIG Train showing forewater and separate slugs of flooding fluid ......................................................................................... 10 Figure 2.2: Typical Dewatering Pig Train ............................................................................... 14 Figure 3.1: Environment that may be affected (EMBA) from potential impacts associated with FCG and hydrotest discharges .................................................................. 16 Figure 3.2: Classification of the Benthic Habitat within the Operational Area ........................ 18 Figure 4.1: Potential discharge impact envelopes based on a 48 hour median of 0.06 mg/L and typical discharge rate (0.5m/s pigging speed) ........................... 23 APPENDICES APPENDIX A CHEMICAL SELECTION PROCESS .................................................... 32 APPENDIX B OVERVIEW OF THE ABU HAZARDOUS MATERIALS APPROVAL PROCEDURE .......................................................................................... 41 APPENDIX C MODELLING REPORT ......................................................................... 50 APPENDIX D WHOLE OF EFFLUENT TOXICITY (WET) TESTING .......................... 64 APPENDIX E EPBC MATTERS OF NATIONAL ENVIRONMENTAL SIGNIFICANCE ............................................................................................................ 70 © Chevron Australia Pty Ltd Public Page 2 Printed Date: 14/1/2016 Uncontrolled when printed Wheatstone Project Document No: WS0-0000-HES-PLN-CVX-000-00101-000 Offshore Facilities and Produced Formation Water Discharge Revision: 2 Management Plan: Stage 1 Revision Date: 21/12/2015 ACRONYMS, ABBREVIATIONS AND TERMINOLOGY °C Degrees Celsius μg/L Micrograms per Litre ACR Acute to Chronic Ratio ADBAC Alky Dimethyl Benzyl Ammonium Chloride ADCP Acoustic Doppler Current Profiler ANSIA Ashburton North Strategic Industrial Area ANZECC Australian and New Zealand Environment and Conservation Council ARMCANZ Agriculture and Resource Management Council of Australia and New Zealand BCF Bioconcentration Factor CAR Compliance Assessment Report CEFAS Centre for Environment, Fisheries & Aquaculture Science CFC Chlorofluorocarbons CHARM Chemical Hazard and Risk Management Cth Commonwealth DBNGP Dampier-to-Bunbury Natural Gas Pipeline DDG DBP Development Group Pty Ltd DG Dangerous Goods Domgas Domestic gas DOTE Department of the Environment - formerly Department of Sustainability, Environment, Water, Population and Communities (Cth) Draft EIS/ERMP The Environmental Impact Statement/Environmental Review and Management Program EC Effect Concentration EMBA Environment that may be Affected EP Act (WA) Environmental Protection Act 1986 EPBC Act (Cth) Environment Protection and Biodiversity Conservation Act 1999 EPBC 2008/4469 The Commonwealth Primary Environmental Approval and conditional requirements for the Wheatstone Project. Commonwealth Government of Australia, Minister for Sustainability, Environment, Water, Populations and Communities, Hon. Tony Burke, 22 September 2011, with variations to EPBC 2008/4469 conditions 44, 45, 55, 56 and 66 made pursuant to section 143 of the EPBC Act, as amended from time to time. FCG Flooding, Cleaning And Gauging
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