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  • Gorgon Gas Development Response to Submissions: Gorgon Gas Development Revised and Expanded Proposal, Public Environmental Review

    Document No: G1-NT-REPX0001731 Revision: 1

    Revision Date: 10 March 2009 Copy No:

    IP Security: Public

    © Chevron Australia Pty Ltd

  • Gorgon Gas Development Document No: G1-NT-REPX0001731 Response to Submissions: Gorgon Gas DMS ID: 003751179 Development Revised and Expanded Revision: 1 Proposal, Public Environmental Review Revision Date: 10 March 2009

    Page ii Public © Chevron Australia Pty Ltd Uncontrolled when printed Printed Date: 10/3/2009

    CONTROLLED DOCUMENT

    RESPONSE TO SUBMISSIONS: GORGON GAS DEVELOPMENT REVISED AND EXPANDED PROPOSAL, PUBLIC ENVIRONMENTAL

    REVIEW Document Information

    Document Number G1-NT-REPX0001731 DMS ID 003751179 Rev 1

    Document Custodian Joe Sanderson

    Department Owner HES

    Current Revision Approvals

    Name / Title Signature Date

    Prepared by Joe Sanderson

    Checked by Julia Martin

    Approved by Laura Boudreau

    Document Control Revision History Revision Date Description Prepared by Checked by Approved by

    0 03/02/2009 Final Submission to EPA JSMQ JMXV LKBO

    1 10/03/2009 Update of Final Document for Submission to the EPA JMSQ JMXV LKBO

    IP & Security Classification

    Classified Confidential

    Business Public

  • Gorgon Gas Development Document No: G1-NT-REPX0001731 Response to Submissions: Gorgon Gas DMS ID: 003751179 Development Revised and Expanded Revision: 1 Proposal, Public Environmental Review Revision Date: 10 March 2009

    © Chevron Australia Pty Ltd Public Page iii Printed Date: 10/3/2009 Uncontrolled when printed

    Document Distribution Copy No Company / Department Name / Position

    O (Original) Chevron Australia Pty Ltd Gorgon Document Control

    1

  • Gorgon Gas Development Document No: G1-NT-REPX0001731 Response to Submissions: Gorgon Gas DMS ID: 003751179 Development Revised and Expanded Revision: 1 Proposal, Public Environmental Review Revision Date: 10 March 2009

    © Chevron Australia Pty Ltd Public Page 1 Printed Date: 10/3/2009 Uncontrolled when printed

    TABLE OF CONTENTS 1.0 INTRODUCTION................................................................................................ 4

    1.1 Proposal ................................................................................................................ 4 1.2 Assessment Process ............................................................................................. 5

    1.2.1 Western Australian Environmental Impact Assessment Process .............. 5 1.2.2 Commonwealth Environmental Impact Assessment Process.................... 5

    1.3 Purpose and Scope of Document.......................................................................... 7 1.4 Structure of Document........................................................................................... 7

    2.0 PROJECT UPDATES ........................................................................................ 8 2.1 Changes to the Project .......................................................................................... 8 2.2 Revised Environmental Impacts .......................................................................... 19

    2.2.1 Marine Physical Environment and Coastal Processes ............................ 19 2.2.2 Marine Water Quality and Sediment Quality ............................................ 19 2.2.3 Marine Fauna and Benthic Primary Producers ........................................ 19

    3.0 PUBLIC SUBMISSIONS .................................................................................. 22 3.1 Submissions Received ........................................................................................ 22

    4.0 RESPONSE TO SUBMISSIONS...................................................................... 23 4.1 Description of Revised Proposal ......................................................................... 23

    4.1.1 Further Information on How the Revised Proposal Compares to the Approved Development ........................................................................... 39

    4.2 Stakeholder Consultation .................................................................................... 40 4.3 Risk-based Assessment Approach...................................................................... 41 4.4 Terrestrial Environment ....................................................................................... 52 4.5 Terrestrial Fauna ................................................................................................. 57

    4.5.1 Further Information Regarding the White-winged Fairy-wren .................. 61 4.6 Subterranean Fauna............................................................................................ 65

    4.6.1 Additional Information Relating to Potential Restriction of Subterranean Fauna on Barrow Island........................................................................... 73

    4.7 Flora and Vegetation ........................................................................................... 75 4.8 Marine and Coastal Environment ........................................................................ 77

    4.8.1 Further Information Regarding the Assessment of Drill/Blast-related Impacts .................................................................................................... 80

    4.8.2 Further Information Regarding the Assessment of Dredging-related Impacts .................................................................................................... 82

    4.8.3 Further Information Regarding Marine Component of the Proposed CO2 Seismic Monitoring Program.................................................................... 86

    4.9 Marine Fauna ...................................................................................................... 88 4.9.1 Additional Information Relating to the Potential Impacts of Artificial

    Lighting on Marine Turtles ..................................................................... 106 4.10 Marine Physical Environment and Coastal Processes ...................................... 110 4.11 Marine Water and Sediment Quality.................................................................. 115

    4.11.1 Further Information Regarding Marine Water and Sediment Quality ..... 125 4.12 Marine Benthic Primary Producers.................................................................... 127 4.13 Quarantine......................................................................................................... 147 4.14 Air Emissions..................................................................................................... 162 4.15 Light Emissions ................................................................................................. 167

  • Gorgon Gas Development Document No: G1-NT-REPX0001731 Response to Submissions: Gorgon Gas DMS ID: 003751179 Development Revised and Expanded Revision: 1 Proposal, Public Environmental Review Revision Date: 10 March 2009

    Page 2 Public © Chevron Australia Pty Ltd Uncontrolled when printed Printed Date: 10/3/2009

    4.16 Noise Emissions................................................................................................ 171 4.17 Greenhouse Gas Emissions.............................................................................. 174

    4.17.1 Further Information Regarding the Risks and Impacts Relating to Leak or Release of CO2 at the Greater Volume of Production ........................... 181

    4.17.2 Further Information Regarding the Concentration of Ozone and Comparison to NEPM Limit.................................................................... 183

    4.18 Matters of National Environmental Significance................................................ 186 4.19 Key Management Actions and Proposed Environmental Conditions ................ 194 4.20 Other Comments ............................................................................................... 207

    5.0 REFERENCES............................................................................................... 220 6.0 SHORT TITLES AND ACRONYMS............................................................... 225

    TABLES Table 2.1: East Coast Marine Facilities Construction Methodology....................................... 10 Table 2.2: Comparison of the Approved Development with the Revised Proposal................ 13 Table 2.3: Comparison of Approved vs Revised Development Predicted Coral Loss,

    within Barrow Island Management Units........................................................... 20 Table 2.4: Detailed Breakdown of Predicted Benthic Primary Producer Habitat

    Disturbance, within Barrow Island Management Units, as a Result of the Revised Proposal .............................................................................................. 20

    Table 4.1: Description of Revised Proposal........................................................................... 23 Table 4.2: Stakeholder Consultation...................................................................................... 40 Table 4.3: Risk-based Assessment Approach ....................................................................... 41 Table 4.4: General Terrestrial Environment.................................................

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