Gorgon Emp Gorgon Gas Development Drilling and Completion Program

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    Chevron Australia Pty Ltd

    Document No: G1-NT-PLNX0001023 Revision: 0

    Revision Date: 9 June 2011 Copy No:

    IP Security: Public

    Environment PlanGorgon Gas Development Drilling andCompletion Program

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    Document No: G1-NT-PLNX0001023 Environment Plan:

    DMS ID: 00391225 Gorgon Gas Development Drilling and Completion Program

    Revision Date: 9 June 2011 Revision: 0

    Chevron Australia Pty Ltd Public Page v

    Printed Date: 7 July 2011 Uncontrolled when Printed

    Table of Contents

    Terminology, Definitions and Abbreviations .................................................................................................. 9

    Executive Summary ..................................................................................................................................... 18

    1.0

    Introduction ........................................................................................................................................ 19

    1.1

    Proponent ................................................................................................................................ 19

    1.2

    Project ..................................................................................................................................... 19

    1.3

    Location ................................................................................................................................... 19

    1.4

    Gorgon Gas Development Environmental Approvals ............................................................. 23

    1.5

    Purpose of this Plan ................................................................................................................ 24

    1.5.1

    Scope of this Environment Plan .............................................................................. 24

    1.5.2

    Requirements .......................................................................................................... 24

    1.5.3

    Hierarchy of Documentation .................................................................................... 26

    1.5.4

    Relevant Standards and Guidelines ........................................................................ 28

    1.5.5

    Stakeholder Consultation ........................................................................................ 29

    1.5.6

    Public Availability ..................................................................................................... 30

    2.0

    Drilling Activities ................................................................................................................................ 31

    2.1

    Overview ................................................................................................................................. 31

    2.2

    Well Design and Drilling Details .............................................................................................. 32

    2.2.1

    Design ...................................................................................................................... 32

    2.2.2

    Drilling Fluids and Chemical Additives .................................................................... 33

    2.2.3

    Drilling Fluids and Cuttings Handling and Disposal................................................. 34

    2.2.4

    Cleaning the SBM Holding Tanks ........................................................................... 35

    2.2.5

    Cementing Operations ............................................................................................. 35

    2.2.6

    Pre- and Post-drilling Seabed Surveys ................................................................... 35

    2.2.7

    Logging .................................................................................................................... 36

    2.2.8

    Well Testing and Clean-Up ...................................................................................... 36

    2.2.9 Well Suspension and Completion ........................................................................... 36

    2.2.10 Marine and Support Operations .............................................................................. 36

    2.2.11

    Time Frame ............................................................................................................. 37

    3.0

    Existing Marine Environment ............................................................................................................ 38

    3.1

    Physical Environment ............................................................................................................. 38

    3.1.1

    Bathymetry and Seabed Features ........................................................................... 38

    3.1.2

    Metocean Conditions ............................................................................................... 38

    3.2

    Marine Biological Environment ............................................................................................... 38

    3.2.1 Benthic Flora and Fauna ......................................................................................... 39

    3.2.2

    Macrofauna .............................................................................................................. 39

    3.3

    Social and Economic Environment ......................................................................................... 43

    3.3.1

    Petroleum Activities ................................................................................................. 43

    3.3.2

    Fisheries .................................................................................................................. 43

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    Environment Plan: Document No.: G1-NT-PLNX0001023

    Gorgon Gas Development Drilling and Completion Program DMS ID: 00391225

    Revision: 0 Revision Date: 9 June 2011

    Page vi Public Chevron Australia Pty Ltd

    Uncontrolled when Printed Printed Date: 7 July 2011

    3.3.3

    Shipping .................................................................................................................. 44

    3.3.4

    Recreational and Tourism Activities ....................................................................... 45

    3.3.5

    Marine Protected Areas .......................................................................................... 45

    3.3.6

    Shipwrecks.............................................................................................................. 45

    3.3.7

    Defence Practice Areas .......................................................................................... 45

    3.3.8

    Cultural Heritage ..................................................................................................... 45

    3.3.9

    Particular Issues or Sensitivities ............................................................................. 45

    4.0

    Risk Assessment .............................................................................................................................. 46

    4.1

    Overview ................................................................................................................................ 46

    4.2 Methodology ........................................................................................................................... 46

    4.3 Key Outcomes ........................................................................................................................ 61

    4.3.1 Routine and Operational Discharges ...................................................................... 61

    4.3.2

    Noise ....................................................................................................................... 66

    4.3.3

    Positioning and Presence of the Rig ...................................................................... 67

    4.3.4

    Quarantine .............................................................................................................. 67

    4.3.5

    Contingency Plan and Management of Unplanned Operations ............................. 68

    5.0

    Objectives, Performance Standards and Relevant Documentation ................................................. 72

    5.1 Overview ................................................................................................................................ 72

    5.2

    Objectives ............................................................................................................................... 72

    5.3

    Performance Standards ......................................................................................................... 72

    5.3.1

    Discharge of Drilling Fluid and Cuttings ................................................................. 72

    5.3.2

    Underwater Noise ................................................................................................... 73

    5.3.3

    Oil/Chemical Spill .................................................................................................... 73

    5.3.4

    Fuel (Diesel Spill) .................................................................................................... 73

    5.3.5

    Loss of Well Control .................................................................................