Gorgon Emp Offshore Domestic Gas Pipeline Installation Management Plan

8/18/2019 Gorgon Emp Offshore Domestic Gas Pipeline Installation Management Plan

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© Chevron Australia Pty Ltd

Document No: G1-NT-PLNX0000696 Revision: 3

Revision Date: 20 October 2014 Copy No:

IP Security: Public

Gorgon Gas Developmentand Jansz Feed Gas Pipeline:Offshore Domestic Gas Pipeline InstallationManagement Plan


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Document No: G1-NT-PLNX0000696 Gorgon Gas Development and Jansz Feed Gas Pipeline:

Revision Date: 20 October 2014Offshore Domestic Gas Pipeline Installation Management Plan

Revision: 3

© Chevron Australia Pty Ltd Public Page v

Printed Date: 26 November 2014 Uncontrolled when Printed

Table of Contents

Terminology, Defini tions and Abbreviations .......................................................................................... 10

1.0 Introduction ..................................................................................................................................... 22

1.1 Proponent ................................................................................................................................ 22

1.2

Project ..................................................................................................................................... 22

1.3 Location ................................................................................................................................... 22

1.4 Environmental Approvals ........................................................................................................ 25

1.5 Scope of this Plan ................................................................................................................... 26

1.6 Purpose of this Plan ................................................................................................................ 26

1.6.1 Legislative Requirements ........................................................................................ 26

1.6.2 Requirements .......................................................................................................... 27

1.6.3 Hierarchy of Documentation .................................................................................... 29

1.6.4

Stakeholder Consultation ........................................................................................ 31

1.6.5 Public Availability ..................................................................................................... 32

1.7 Format of the Plan .................................................................................................................. 33

2.0 Appl icable Environmental Legislation .......................................................................................... 34

2.1 Regulatory Framework ............................................................................................................ 34

2.2 Codes of Practice .................................................................................................................... 36

3.0 Description of Activities ................................................................................................................. 37

3.1 Location ................................................................................................................................... 37

3.2

Activity Overview ..................................................................................................................... 39

3.3 Mobilisation ............................................................................................................................. 39

3.4 Pipeline Surveys ..................................................................................................................... 40

3.5 Offshore Pipelay ..................................................................................................................... 40

3.5.1 Shallow Water Pipelay ............................................................................................. 40

3.5.2 Deep Water Pipelay ................................................................................................. 41

3.6 Offshore Pipeline Stabilisation ................................................................................................ 41

3.6.1 Trenching and Jetting .............................................................................................. 41

3.6.2

Rock-bolting ............................................................................................................. 42

3.6.3 Rock Installation ...................................................................................................... 42

3.7 Riser Installation and Installation of Concrete Mattresses ...................................................... 43

3.8 Intertidal Pipeline Installation .................................................................................................. 43

3.9 Pre-commissioning ................................................................................................................. 44

3.10 Activity Schedule ..................................................................................................................... 46

4.0 Description of the Environment ..................................................................................................... 47

4.1 Physical Environment ............................................................................................................. 47

4.1.1

Climate ..................................................................................................................... 47

4.1.2 Oceanography ......................................................................................................... 47


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Gorgon Gas Development and Jansz Feed Gas Pipeline: Document No.: G1-NT-PLNX0000696

Offshore Domestic Gas Pipeline Installation Management PlanRevision Date: 20 October 2014

Revision: 3

Page vi Public © Chevron Australia Pty Ltd

Uncontrolled when Printed Printed Date: 26 November 2014

4.1.3 Bathymetry ...............................................................................................................47

4.1.4 Topography ..............................................................................................................48

4.1.5 Geology and Surficial Sediments ............................................................................48

4.1.6 Water Quality ...........................................................................................................48

4.2

Biological Environment ............................................................................................................49

4.2.1 Benthic Habitats .......................................................................................................49

4.2.2 Fauna .......................................................................................................................64

4.3 Socio-economic Environment .................................................................................................83

4.3.1 Cultural Heritage ......................................................................................................83

4.3.2 Conservation Areas .................................................................................................87

4.3.3 Petroleum Development ..........................................................................................89

4.3.4 Commercial Shipping ...............................................................................................89

4.3.5

Commercial Fisheries and Aquaculture ...................................................................89

4.3.6 Marine-based Tourism ............................................................................................. 90

5.0 Environmental Risk Assessment and Management Measures .................................................. 91

5.1 Overview ................................................................................................................................. 91

5.2 Marine and Terrestrial Disturbance Footprints......................................................................110

5.3 Potential Impacts to Marine Turtles ......................................................................................112

5.4 Physical Presence .................................................................................................................113

5.4.1 Fauna Interaction ...................................................................................................113

5.4.2

Artificial Light .........................................................................................................115

5.4.3 Noise and Vibration ...............................................................................................116

5.4.4 Interference with Other Users ................................................................................117

5.5 Installation Activities ..............................................................................................................117

5.5.1 Disturbance of Benthic Habitats ............................................................................117

5.5.2 Anchoring and Mooring ..........................................................................................119

5.5.3 Turbidity and Sedimentation ..................................................................................127

5.5.4 Disturbance of Potential Acid Sulfate Soils ...........................................................129

5.5.5

Erosion ...................................................................................................................130

5.5.6 Site Reinstatement ................................................................................................130

5.6 Disturbance of Cultural Heritage Sites ..................................................................................131

5.6.1 Shipwrecks ............................................................................................................131

5.6.2

Indigenous Heritage Sites ......................................................................................132

5.7

Introduction of Non-indigenous Species ...............................................................................133

5.7.1 Ballast Water .........................................................................................................133

5.7.2 Biofouling ...............................................................................................................133

5.7.3

Introduction and/or Spread of Weeds ....................................................................134

5.8

Discharges to Sea .................................................................................................................135


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5.8.1 Deck Drainage ....................................................................................................... 135

5.8.2 Sewage, Greywater and Putrescible Wastes ........................................................ 135

5.8.3 Equipment and Machinery Space ......................................................................... 136

5.8.4 Cooling Water ........................................................................................................ 136

5.9

Disposal of Wastes ............................................................................................................... 136

5.9.1 Non-hazardous and Hazardous Waste ................................................................. 136

5.9.2 Welding and Coating Debris .................................................................................. 137

5.9.3 Hydrotest Water ..................................................................................................... 138

5.10 Atmospheric Emissions ......................................................................................................... 138

5.10.1 Combustion Emissions .......................................................................................... 138

5.10.2 Ozone Depleting Substances ................................................................................ 139

5.10.3 Dust ....................................................................................................................... 139

5.11

Unplanned Events ................................................................................................................. 140

5.11.1 Spills and Leaks .................................................................................................... 140

5.11.2 Loss of Equipment and Materials from Flooding of the Work Area ....................... 158

5.11.3 Unplanned Discharge of Chemically Treated Water ............................................. 158

5.11.4 Fire ......................................................................................................................... 159

6.0 Object ives, Performance Standards and Relevant Documentat ion ........................................ 160

6.1 Overview ............................................................................................................................... 160

6.2 Objectives ............................................................................................................................. 160

6.3

Performance Standards ........................................................................................................ 160

6.4 Relevant Documentation ....................................................................................................... 160

7.0 Implementation .............................................................................................................................. 164

7.1 Environmental Policy ............................................................................................................ 164

7.2 Environmental Management Documentation ........................................................................ 164

7.2.1 Overview ................................................................................................................ 164

7.2.2 Chevron ABU OE Documentation ......................................................................... 164

7.2.3 Gorgon Gas Development and Jansz Feed Gas Pipeline Documentation ........... 165

7.3

Role and Responsibilities ...................................................................................................... 167

7.3.1 Overview ................................................................................................................ 167

7.3.2 Gorgon Development Director ............................................................................... 167

7.3.3 Gorgon Upstream Construction Manager ............................................................. 167

7.3.4

Gorgon Environmental Program Team Leader ..................................................... 167

7.3.5

Contract Project Manager ...................................................................................... 167

7.3.6 All Personnel.......................................................................................................... 168

7.4 Training and Inductions ......................................................................................................... 168

7.5

Audit and Review .................................................................................................................. 169

7.5.1

Internal Auditing ..................................................................................................... 169


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7.5.2 External Auditing ....................................................................................................169

7.6 Environmental Survey and Monitoring ..................................................................................170

7.6.1 Pre-Installation Survey ...........................................................................................170

7.6.2 Installation Monitoring ............................................................................................170

7.6.3

Post-Installation Survey .........................................................................................171

7.7 Reporting ...............................................................................................................................171

7.7.1 Compliance Reporting ...........................................................................................171

7.7.2 Environmental Performance Reporting .................................................................171

7.7.3 Routine Internal and External Reporting ...............................................................171

7.7.4 Incident Response and Reporting .........................................................................172

7.8 Control of Documentation and Records ................................................................................174

7.9 Review of the Plan ................................................................................................................175

8.0

References .....................................................................................................................................176

Appendix 1 Commitment Register .........................................................................................181

List o f Tables

Table 1-1 Requirements of this Plan ......................................................................................................... 27

Table 2-1 Western Australian Legislative Requirements .......................................................................... 34

Table 2-2 Commonwealth Legislative Requirements ................................................................................ 35

Table 3-1 Indicative Schedule of Activities ................................................................................................ 46

Table 4-1 Vegetation Associations Identified in the Intertidal Zone .......................................................... 55

Table 4-2 Protected Dolphin Species that may Occur in the Vicinity of the DomGas Pipeline .................65

Table 4-3 Protected Whale Species that may Occur in the Vicinity of the DomGas Pipeline ................... 66

Table 4-4 Protected Marine Turtles that are Likely to Occur in the Vicinity of the DomGas Pipeline ....... 68

Table 4-5 Proximity of Turtle Nesting Beaches in the Great Sandy and Passage Islands Groups tothe DomGas Pipeline Route .................................................................................................69

Table 4-6 Protected Sharks that may Occur in the Vicinity of the DomGas Pipeline ................................73

Table 4-7 Avifauna Species Observed in Proximity to the DomGas Pipeline Route in the GreatSandy and Passage Islands Groups ....................................................................................74

Table 4-8 Protected Avifauna that may Occur in the Vicinity of the DomGas Pipeline ............................. 78

Table 5-1 Risk Levels and Risk Tolerability1 .............................................................................................93

Table 5-2 Risk Register .............................................................................................................................95

Table 5-3 Potential Stressors to Marine Turtles During Installation of the DomGas Pipeline .................112

Table 5-4 Potential Spill Scenarios ..........................................................................................................151

Table 5-5 Spill Response Capability ........................................................................................................153

Table 6-1 Objectives, Performance Standards and Relevant Documentation ........................................161

Table 7-1 Incident Reporting Requirements ............................................................................................173


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List of Figures

Figure 1-1 Location of the Greater Gorgon Area ...................................................................................... 23

Figure 1-2 Location of the Gorgon Gas Development and Jansz Feed Gas Pipeline .............................. 24

Figure 1-3 Hierarchy of Gorgon Gas Development Environmental Documentation ................................ 30

Figure 1-4 Deliverable Development, Review, and Approval Flow Chart ................................................. 32

Figure 3-1 Location of the DomGas Pipeline ............................................................................................ 38

Figure 4-1 Benthic Habitat Mapping for the DomGas Pipeline at Barrow Island ...................................... 50

Figure 4-2 Benthic Habitat Mapping along the DomGas Pipeline between Barrow Island and theMainland ............................................................................................................................... 51

Figure 4-3 Benthic Habitat Mapping for the DomGas Pipeline near the Mainland Shore-Crossing ......... 52

Figure 4-4 Photographs of Vegetation Associations Identified in the Intertidal Zone ............................... 58

Figure 4-5 DomGas Pipeline Vegetation Mapping within the Intertidal Zone ........................................... 63

Figure 4-6 Flatback Turtle Internesting Tracks from Barrow Island for 2007–2011 near the DomGasPipeline Route ...................................................................................................................... 70

Figure 4-7 Remnants of Ballast Rock from Macey’s Wreck amongst Mangroves near the DomGasPipeline Shore-crossing ....................................................................................................... 84

Figure 4-8 Cultural Heritage Sites along the DomGas Pipeline Route within the Intertidal Zone ............. 86

Figure 4-9 Conservation Areas within the Region of the DomGas Pipeline ............................................. 88

Figure 5-1 Chevron Integrated Risk Prioritization Matrix .......................................................................... 92

Figure 5-2 Marine Disturbance Footprint for the DomGas Pipeline ........................................................ 111

Figure 5-3 Indicative Anchoring Touch-Down Distance and Seabed Disturbance ................................. 120

Figure 5-4 Typical 8-point Mooring Pattern for Shallow Water and Deep Water Pipelay Barges ........... 120

Figure 5-5 Indicative Anchoring Areas near Barrow Island ..................................................................... 121

Figure 5-6 Indicative Anchoring Areas near the Mainland Shore-Crossing ............................................ 122

Figure 5-7 Typical Mooring Pattern for the Deep Water Pipelay Barge near Coral at the BarrowIsland Jetty ......................................................................................................................... 124

Figure 5-8 Typical Mooring Pattern for the Deep Water Pipelay Barge at Coral Pinnacle nearBarrow Island ...................................................................................................................... 125

Figure 5-9 Typical Mooring Pattern for the Deep Water Pipelay Barge at Coral Pinnacle alongOffshore DomGas Pipeline Route ...................................................................................... 126

Figure 5-10 Predicted Probability of Surface Films >0.15 g/m

2

from a 200 m

3

Diesel Spill at KP 0during Winter Months ......................................................................................................... 142

Figure 5-11 Predicted Probability of Surface Films >0.15 g/m2 from a 2.5 m

3 Fuel Oil Spill at KP 25

during Winter Months ......................................................................................................... 143

Figure 5-12 Predicted Probability of Surface Films >0.15 g/m2 from a 200 m

3 Fuel Oil Spill at KP 25


Figure 5-13 Predicted Probability of Surface Films >0.15 g/m2 from a 2.5 m

3 Diesel Spill at KP 50


Figure 5-14 Predicted Probability of Surface Films >0.15 g/m2 from a 200 m

3 Diesel Spill at KP 50


Figure 7-1 ABU Policy 530 ...................................................................................................................... 166

Figure 7-2 Management Organisation and Communication Lines .......................................................... 168


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Terminology, Definitions and Abbreviations

Terms, definitions and abbreviations used in this document are listed below. These align withthe terms, definitions and abbreviations defined in Schedule 2 of the Western Australian GorgonGas Development and Jansz Feed Gas Pipeline Ministerial Implementation Statements No. 800and No. 769 respectively (Statement No. 800 and 769) and the Commonwealth Gorgon Gas

Development and Jansz Feed Gas Pipeline Ministerial Approvals (EPBC Reference:2003/1294, 2008/4178, and 2005/2184).

µm Micrometre. 1 μm = 10-6 metre = 0.000001 metre or one millionthof a metre.

ABU Australasia Business Unit

ADIOS Automated Data Inquiry for Oil Spills

AEMT Asset Emergency Management Team

AFC Approved for Construction

AHD Australian Height Datum

AIC Australian Interaction Consultants

ALARP As Low As Reasonably Practicable

Defined as a level of risk that is not intolerable, and cannot bereduced further without the expenditure of costs that are grossly

disproportionate to the benefit gained.

AMOSC Australian Marine Oil Spill Centre

AMSA Australian Maritime Safety Authority

APASA Asia Pacific Applied Science Associates

APIA Australian Pipeline Industry Association

APPEA Australian Petroleum Production and Exploration Association

AQIS Australian Quarantine and Inspection Service

ARI Assessment on Referral Information

AS Australian Standard

ASBU Australasian Strategic Business Unit

ASS Acid Sulfate Soil

ASSMP Acid Sulfate Soil Management Plan


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At risk Being at risk of Material Environmental Harm or SeriousEnvironmental Harm and/or, for the purposes of the EPBC Actrelevant listed threatened species, threatened ecologicalcommunities and listed migratory species, at risk of MaterialEnvironmental Harm or Serious Environmental Harm.

ATV All Terrain Vehicle

Avifauna Birds of a particular region

Bathymetric Relating to measurements of the depths of oceans or lakes

Benthic Living upon or in the sea floor

Biocide Any substance that can destroy living organisms

Biofouling Aquatic organisms attached on or in a hull, including the internal

seawater pipe work, anchor well, cable locker, bilges, etc.

Biomass The total mass or amount of living organisms in a particular areaor volume.

BOD Biological Oxygen Demand

Bombora Raised, dome-shaped, limestone feature, >1 m high, oftenformed by coral of the genus Porites.

BRUV Baited Remote Underwater Video system

Bund An area of containment, such as a dam, wall, or other artificialembankment.

Caisson A large watertight chamber used for construction under water.

CAMBA China–Australia Migratory Bird Agreement

Cetacean Various aquatic (mainly marine) mammals of the order Cetacea,(including whales, dolphins and porpoises) characterised by anearly hairless body, front limbs modified into broad flippers and aflat notched tail.

CFCs Chlorofluorocarbons

CH4 Methane

Chevron Australia Chevron Australia Pty Ltd

CITES Convention on International Trade in Endangered Species ofWildlife and Flora 1973.

CO Carbon monoxide

CO2 Carbon dioxide


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Construction Construction includes any Proposal-related (or action-related)construction and commissioning activities within the Terrestrialand Marine Disturbance Footprints, excluding investigatory workssuch as, but not limited to, geotechnical, geophysical, biologicaland cultural heritage surveys, baseline monitoring surveys and

technology trials.

CPMM CITIC Pacific Mining Management

CS1 Compressor Station 1 on the Dampier to Bunbury Natural GasPipeline

Cth Commonwealth of Australia

DBNGP Dampier to Bunbury Natural Gas Pipeline

DEC Former Western Australian Department of Environment and

Conservation

Demersal Living on the sea floor or just above it

DER Western Australian Department of Environment Regulation

Diurnal Daily

DMP Western Australian Department of Mines and Petroleum

DomGas Domestic Gas

DoT Western Australia Department of Transport

DotE Commonwealth Department of the Environment

DPaW Western Australian Department of Parks and Wildlife

Dry Break Coupling A coupling design to allow an operator to connect/disconnecthoses manually without spillage.

Easement A right held by the proponent to make use of the land of anotherfor the installation and operation of a pipeline.

Ebb Tide The period between high tide and the next low tide in which thesea is receding.

Ecological Element Element listed in listed in Condition 14.2 of Statement No. 800,Condition 12.2 of Statement No. 769 and Condition 11.2 of EPBCReference: 2003/1294 and 2008/4178

EIS/ERMP Environmental Impact Statement/Environmental Review andManagement Programme (for the Proposed Gorgon GasDevelopment dated September 2005) as amended orsupplemented from time to time

EMP Environmental Management Plan


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Hatchling Newly hatched marine turtle. This period refers to the stagebetween hatching from the egg shell and feeding offshore duringwhich the neonate turtle uncurls and absorbs the egg yolk,emerges on to the beach surface, crawls across the beach andswims offshore to begin feeding, ceasing reliance on its internal

yolk sac. At this stage the turtle is termed a ‘post-hatchling’.

HCFC Hydrochlorofluorocarbons

HES Health, Environment and Safety

Hot Work Any activity in a restricted/designated area, which either uses orcould generate a fire through a naked flame, heat or sparks.

Hydrocarbons A large class of organic compounds composed of hydrogen andcarbon. Crude oil, natural gas, and natural gas condensate areall mixtures of various hydrocarbons.

Hydrotest Method whereby water is pressurised within pipes and vessels todetect leaks.

IBC Intermediate Bulk Container

IMO International Maritime Organization

ISO International Organization for Standardization

IUCN International Union for Conservation of Nature

JAMBA Japan–Australia Migratory Bird Agreement

Jansz Feed Gas Pipeline The Jansz Feed Gas Pipeline as approved in Statement No. 769and EPBC Reference: 2005/2184 as amended or replaced fromtime to time

JHA Job Hazard Analysis

KJVG Kellogg Joint Venture Gorgon

km Kilometre

KP Kilometre Point

kVa Kilovolt-ampere

L Litre

Light Attenuation The absorption and scattering of light underwater

Littoral A shore; the zone between high tide and low tide; of, or related tothe shore, especially the seashore.

LNG Liquefied Natural Gas


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m Metre

m/s Metres per second

m2 Square metres

m3 Cubic metres

Macroalgae Benthic marine plants that are non-flowering and lack roots,stems and vascular tissue. Can be seen without the aid of amagnification; includes large seaweeds.

Macro-invertebrates An invertebrate animal (an animal without a backbone [vertebralcolumn]) large enough to be seen without the aid ofmagnification; includes sponges, crinoids, hydroids, sea pens,sea whips, gorgonians, snails, clams, crayfish and seacucumbers.

Management Triggers Are quantitative, or where this is demonstrated to be notpracticable, qualitative matters above or below whicheverrelevant additional management measures must be considered.

Marine DisturbanceFootprint

The area of the seabed to be disturbed by construction oroperations activities associated with the Marine Facilities listed inCondition 14.3 of Statement No. 800, and Condition 11.3 inEPBC Reference: 2003/1294 and 2008/4178 (excepting that areaof the seabed to be disturbed by the generation of turbidity andsedimentation from dredging and dredge spoil disposal) as setout in the Coastal and Marine Baseline State Report requiredunder Condition 14.2 of Statement No. 800, and Condition 11.2 ofEPBC Reference: 2003/1294 and 2008/4178.

Marine Facilities In relation to Statement No. 800 and EPBC Reference:2003/1294 and 2008/4178, the Marine Facilities are the:

Materials Offloading Facility (MOF)

LNG Jetty

Dredge Spoil Disposal Ground

Offshore Feed Gas Pipeline System

Domestic Gas Pipeline

For the purposes of Statement No. 800, Marine Facilities alsoinclude:

Marine upgrade of the existing WAPET landing.

MARPOL The International Convention for the Prevention of Pollution FromShips, 1973 as modified by the Protocol of 1978. Also known asMARPOL 73/78.

Material Environmental

Harm

Environmental Harm that is neither trivial nor negligible.

MDF Marine Disturbance Footprint


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Megafauna Large vertebrate animals

MEPC Marine Environment Protection Committee

Metrology Measurement of pipeline to ensure alignment for tie-in (e.g. with

the riser).

mg/L Milligrams per litre

mm Millimetre

MOF Materials Offloading Facility

MOPP Marine Oil Pollution Plan

MSDS Material Safety Data Sheet. A widely used system forcataloguing information on substances, such as chemicals,

chemical compounds, and chemical mixtures. MSDS informationmay include instructions for the safe use and potential hazardsassociated with a particular material or product.

MTPA Million Tonnes Per Annum

NDT Non-destructive Testing

Neap Tide A less than average tide occurring at the first and third quarters ofthe moon.

Nearshore Close to shore; or within three nautical miles of Barrow Island.

Neritic The neritic zone, also called the sublittoral zone, is the part of theocean extending from the low tide mark to the edge of thecontinental shelf, with a relatively shallow depth of


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OSRL Oil Spill Response Limited

Oxygen Scavenger Chemical substance added to a mixture to remove or absorboxygen and inhibit corrosion.

Ozone DepletingSubstances

Include: Chlorofluorocarbons (CFCs)

Halon

Carbon tetrachloride

Methyl chloroform

Hydrobromofluorocarbons (HBFCs)

Hydrochlorofluorocarbons (HCFCs)

Methyl bromide

Bromochloromethane (BCM)

PASS Potential Acid Sulfate Soils

Pelagic Living in the open sea rather than in coastal or inland waters.

PER Public Environmental Review for the Gorgon Gas DevelopmentRevised and Expanded Proposal dated September 2008, asamended or supplemented from time to time.

Performance Standards Are matters which are developed for assessing performance, not

compliance, and are quantitative targets or where that isdemonstrated to be not practicable, qualitative targets, againstwhich progress towards achievement of the objectives ofconditions can be measured

Pig Pipeline Inspection Gauge. A device that is inserted into andtravels the length of a pipeline, driven by variety of fluids includingcompressed air, nitrogen, water, etc

PMMC Pilbara Mesquite Management Committee

POWBONS Pollution of Waters by Oil and Noxious Substances

ppb Parts Per Billion

Practicable In relation to EPBC Reference: 2003/1294 and 2008/4178, inconsidering whether a draft Plan meets the requirements of theseconditions, the Minister will determine what is ‘practicable’ (wherethe relevant condition includes that term) having regard to localconditions and circumstances including but not limited topersonnel safety, weather or geographical conditions, costs,environmental benefit and the current state of scientific andtechnical knowledge


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Priority Flora Priority flora is a non-legislative category aimed to manage thoseplant taxa listed by the DPaW on the basis that they are knownfrom only a few collections, or a few sites, but which have notbeen adequately surveyed. Such flora may be rare orthreatened, but cannot be considered for declaration as rare flora

until such survey work has been undertaken

PVC Polyvinylchloride

QMS Quarantine Management System

Recfishwest Western Australian Recreational and Sportsfishing Council

Reference Site Specific areas of the environment, that are not at risk of beingaffected by the proposal (or action) or existing developments, thatcan be used to determine the natural state, including naturalvariability, of environmental attributes such as coral health or

water quality

Rehabilitation The ongoing management and monitoring of the site afterreinstatement works are completed and handover of the site hasbeen accepted by Chevron Australia

Reinstatement Clean up and reconstruction of a site or area to mimic pre-existing landform.

ROKAMBA Republic of Korea–Australia Migratory Bird Agreement

ROV Remotely Operated Vehicle

ROW Right of Way. The strip of land or area along the onshore(intertidal) pipeline alignment that encompasses the pipelines,trenches, access tracks, stockpiles and associated features andin which the pipeline construction activities will be completed.

RPS BBG RPS Bowman Bishaw Gorham

Seagrass Benthic marine plants, which have roots, stems, leaves andinconspicuous flowers with fruits and seeds much like terrestrialflowering plants. Unrelated to seaweed.

Serious EnvironmentalHarm

Environmental harm that is:

a) irreversible, of a high impact or on a wide scale; or

b) significant or in an area of high conservation value or specialsignificance and is neither trivial nor negligible

Sessile Permanently attached directly to the substratum by its base (i.e.immobile), without a stalk or stem

SEWPaC Former Commonwealth Department of Sustainability,Environment, Water, Population and Communities


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S-lay Method of pipelay where the pipeline is laid from the PipelayBarge using tensioner, stinger and roller support systems. Fromthe stern of the Pipelay Barge, the pipeline curves downward tothe seafloor in an 'S-shaped' configuration.

SO2 Sulfur dioxide

SOPEP Shipboard Oil Pollution Emergency Plan

spp. Species (plural)

Spring Tide The highest tides in a lunar month, occurring near new and fullmoons.

SSC Suspended Sediment Concentrations

State Waters The marine environment within three nautical miles of the coast of

Barrow Island or the mainland of Western Australia.

Statement No. 748 Western Australian Ministerial Implementation Statement No. 748(for the Gorgon Gas Development) as amended from time to time[superseded by Statement No. 800]

Statement No. 769 Western Australian Ministerial Implementation Statement No. 769(for the Jansz Feed Gas Pipeline) as amended from time to time

Statement No. 800 Western Australian Ministerial Implementation Statement No. 800(for the Gorgon Gas Development) as amended from time to time

Statement No. 865 Western Australian Ministerial Implementation Statement No. 865(for the Gorgon Gas Development) as amended from time totime.

Stinger A steel structure extending from the stern of the Pipelay Barge,equipped with rollers, to support and control the bend of thepipeline during pipeline installation

Stringing The process whereby multiple sections of pipe are joined togetherto form the pipeline.

Substrate The surface a plant or animal lives upon. The substrate caninclude biotic or abiotic materials. For example, encrusting algaethat lives on a rock can be substrate for another animal that livesabove the algae on the rock.

Surficial Of or pertaining to the surface.

TAPL Texaco Australia Pty. Ltd.

Taxon (plural: taxa) A taxon (plural taxa), or taxonomic unit, is a name designating anorganism or a group of organisms

TBC To be confirmed

TDF Terrestrial Disturbance Footprint


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Terrestrial DisturbanceFootprint (TDF)

The area to be disturbed by construction or operations activitiesassociated with the Terrestrial Facilities listed in Condition 6.3 ofStatement No. 800, and Condition 5.2 of EPBC Reference:2003/1294 and 2008/4178.

Terrestrial Facilities In relation to Statement No. 800 and EPBC Reference:2003/1294 and 2008/4178, the terrestrial facilities are the:

Gas Treatment Plant

Carbon Dioxide Injection System

Associated Terrestrial Infrastructure forming part of theProposal (Action)

Areas impacted for seismic data acquisition

Onshore Feed Gas Pipeline System.

Topsides All parts of a vessel that are not regularly immersed or wettedwith seawater during normal operation

TPH Total Petroleum Hydrocarbon

Turbidity The cloudiness or haziness of a fluid caused by individualparticles (suspended solids) that are generally invisible to thenaked eye, similar to smoke in air. The measurement of turbidityis a key test of water quality

UN United Nations

Vegetation Association Comprises unique flora assemblages, or unique vegetationcommunities, that help to identify the association

VOC Volatile Organic Compounds; organic chemical compounds thathave high enough vapour pressures under normal conditions tovaporise and enter the atmosphere.

WA Western Australia

WAFIC Western Australia Fishing Industry Council

WAPET West Australian Petroleum Pty Ltd.

WAPET Landing Proper name referring to the site of the barge landing existing onthe east coast of Barrow Island prior to the date of StatementNo. 800.

Water Winning Harvesting water to carry out works. Often this consists of apump spread located under water (i.e. ocean or lake) returningwater to the work site

Wet buckle A buckle that leads to localised collapse of a pipeline, which inturn results in fracturing of the pipeline wall, allowing seawater to

flood the pipeline


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Wetsides All parts of a vessel that are regularly immersed or wetted withseawater during normal operation


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1.0 Introduction

1.1 Proponent

Chevron Australia Pty Ltd (Chevron Australia) is the proponent and the person taking the actionfor the Gorgon Gas Development on behalf of the following companies (collectively known as

the Gorgon Joint Venturers):

Chevron Australia Pty Ltd

Chevron (TAPL) Pty Ltd

Shell Development (Australia) Pty Ltd

Mobil Australia Resources Company Pty Limited

Osaka Gas Gorgon Pty Ltd

Tokyo Gas Gorgon Pty Ltd

Chubu Electric Power Gorgon Pty Ltd

pursuant to Statement No. 800 and EPBC Reference: 2003/1294 and 2008/4178.

Chevron Australia is also the proponent and the person taking the action for the Jansz FeedGas Pipeline on behalf of the Gorgon Joint Venturers, pursuant to Statement No. 769, andEPBC Reference: 2005/2184.

1.2 Project

Chevron Australia proposes to develop the gas reserves of the Greater Gorgon Area (Figure1-1).

Subsea gathering systems and subsea pipelines will be installed to deliver feed gas from theGorgon and Jansz–Io gas fields to the west coast of Barrow Island. The feed gas pipelinesystem will be buried as it traverses from the west coast to the east coast of the Island wherethe system will tie in to the Gas Treatment Plant located at Town Point. The Gas TreatmentPlant will comprise three Liquefied Natural Gas (LNG) trains capable of producing a nominalcapacity of five Million Tonnes Per Annum (MTPA) per train. The Gas Treatment Plant will alsoproduce condensate and domestic gas. Carbon dioxide (CO2), which occurs naturally in thefeed gas, will be separated during the production process. As part of the Gorgon GasDevelopment, Chevron Australia will inject the separated CO2 into deep formations belowBarrow Island. The LNG and condensate will be loaded from a dedicated jetty offshore fromTown Point and then transported by dedicated carriers to international markets. Gas fordomestic use will be exported by a pipeline from Town Point to the domestic gas collection anddistribution network on the mainland (Figure 1-2).

1.3 Location

The Gorgon gas field is located approximately 130 km and the Jansz–Io field approximately200 km off the north-west coast of Western Australia. Barrow Island is located off the Pilbaracoast 85 km north-north-east of the town of Onslow and 140 km west of Karratha.

The domestic gas pipeline (‘DomGas pipeline’) extends approximately 60 km offshore from theLNG Jetty on the east coast of Barrow Island to the mainland shore-crossing, approximately90 km north-east of Onslow and 120 km south-east of Karratha. On the mainland, the DomGas

pipeline extends parallel and adjacent to the existing Apache easement, through a 12 kmintertidal zone and an 18 km onshore area to a meter station and then approximately 1.5 km tothe tie-in to the Dampier to Bunbury Natural Gas Pipeline (DBNGP).


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Document No: G1-NT-PLNX0000696

Revision Date: 20 October 2014O

Revision: 3

© Chevron Australia Pty Ltd Public

Printed Date: 26 November 2014

Figure 1-1 Location of the Greater Gorgon Area


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Figure 1-2 Location of the Gorgon Gas Development and Jansz Feed Gas


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1.4 Environmental Approvals

The initial Gorgon Gas Development was assessed through an Environmental ImpactStatement/Environmental Review and Management Programme (EIS/ERMP) assessmentprocess (Chevron Australia 2005, 2006).

The initial Gorgon Gas Development was approved by the Western Australian State Minister forthe Environment on 6 September 2007 by way of Ministerial Implementation Statement No. 748(Statement No. 748) and the Commonwealth Minister for the Environment and WaterResources on 3 October 2007 (EPBC Reference: 2003/1294).

In May 2008, under section 45C of the Western Australian Environmental Protection Act 1986 (EP Act), the Environmental Protection Authority (EPA) approved some minor changes to theGorgon Gas Development that it considered ‘not to result in a significant, detrimental,environmental effect in addition to, or different from, the effect of the original proposal’(EPA 2008). The approved changes are:

excavation of a berthing pocket at the Barge (WAPET) Landing facility

installation of additional communications facilities (microwave communications towers) relocation of the seawater intake

modification to the seismic monitoring program.

In September 2008, Chevron Australia sought both State and Commonwealth approval througha Public Environment Review (PER) assessment process (Chevron Australia 2008) for theRevised and Expanded Gorgon Gas Development to make some changes to ‘Key ProposalCharacteristics’ of the initial Gorgon Gas Development, as outlined below:

addition of a five MTPA LNG train, increasing the number of LNG trains from two tothree

expansion of the CO2 Injection System, increasing the number of injection wells andsurface drill locations

extension of the causeway and the Materials Offloading Facility (MOF) into deeperwater.

The Revised and Expanded Gorgon Gas Development was approved by the Western AustralianState Minister for the Environment on 10 August 2009 by way of Ministerial ImplementationStatement No. 800 (Statement No. 800). Statement No. 800 also superseded StatementNo. 748 as the approval for the initial Gorgon Gas Development. Statement No. 800 thereforeprovides approval for both the initial Gorgon Gas Development and the Revised and ExpandedGorgon Gas Development, which together are known as the Gorgon Gas Development. Amendments to Statement No. 800 Conditions 18, 20 and 21 under Section 46 of the EP Actwere approved by the Western Australian State Minister for the Environment on 7 June 2011 byway of Ministerial Implementation Statement No. 865 (Statement No. 865). However,implementation of the Gorgon Gas Development will continue to be in accordance withStatement No. 800.

On 26 August 2009, the then Commonwealth Minister for the Environment, Heritage and the Arts issued approval for the Revised and Expanded Gorgon Gas Development (EPBCReference: 2008/4178) and varied the conditions for the initial Gorgon Gas Development(EPBC Reference: 2003/1294).

Since the Revised and Expanded Gorgon Gas Development was approved, further minorchanges have also been made and/or approved to the Gorgon Gas Development and are now

also part of the Development. Further changes may also be made/approved in the future. ThisPlan relates to any such changes, and where necessary this document will be specificallyrevised to address the impacts of those changes.


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The Jansz Feed Gas Pipeline was assessed via Environmental Impact Statement/Assessmenton Referral Information (ARI) and EPBC Referral assessment processes (Mobil Australia 2005,2006).

The Jansz Feed Gas Pipeline was approved by the Western Australian State Minister for theEnvironment on 28 May 2008 by way of Ministerial Implementation Statement No. 769

(Statement No. 769) and the Commonwealth Minister for the Environment and WaterResources on 22 March 2006 (EPBC Reference: 2005/2184).

This Plan covers the Gorgon Gas Development as approved under Statement No. 800 and asapproved by EPBC Reference: 2003/1294 and EPBC Reference: 2008/4178.

1.5 Scope of this Plan

This Plan has been prepared to ensure that the installation and pre-commissioning of theDomGas pipeline as described in Section 3.0 is conducted in a manner that protectsenvironmental values and reduces impacts to the environment as far as practicable.

The scope of this Plan covers the installation of the DomGas pipeline, offshore from the LNGJetty on the east coast of Barrow Island to the Australian mainland shore-crossing, and withinthe intertidal zone on the mainland.

Onshore installation of the DomGas pipeline and meter station is addressed in the MainlandOnshore Domestic Gas Pipeline Environmental Management Plan (Chevron Australia 2011a, asamended from time to time).

1.6 Purpose of this Plan

1.6.1 Legislative Requirements

1.6.1.1 Petroleum Legislation

This Plan is presented for approval/acceptance under the Western Australian (WA) Petroleum(Submerged Lands) Act 1982.

This Plan is also required under Condition 7 of the DomGas Onshore Pipeline Licence (PL 92)and Condition 7 of the DomGas Offshore Pipeline Licence (TPL/24).

1.6.1.2 State Ministerial Condit ions

This Plan is required under Condition 23.1 of Statement No. 800, which is quoted below:

23.1) Prior to the commencement of construction of the Feed Gas Pipeline System andDomestic Gas Pipeline respectively, the Proponent shall prepare and submit to the Ministeran Offshore Gas Pipeline Installation Management Plan (the Plan) that meets the objectivesset out in Condition 23.3 and the requirements set out in Condition 23.4, as determined bythe Minister.

1.6.1.3 Commonwealth Ministerial Conditions

This Plan satisfies the requirements of Condition 16.1 of EPBC Reference: 2003/1294 and2008/4178, which is quoted below:

16.1) Prior to commencement of installation of the Feed Gas Pipeline System in Statewaters and Domestic Gas Pipeline respectively, the person taking the action must submit tothe Minister, for approval, an Offshore Gas Pipeline Installation Management Plan (thePlan) that meets the objectives and requirements set out in this Condition.


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1.6.2 Requirements

The requirements of this Plan, as stated in Statement No. 800, EPBC Reference: 2003/1294and 2008/4178, are listed in Table 1-1.

Table 1-1 Requirements of this Plan

MinisterialCondition

ConditionNo.

RequirementsSection

Reference in thisPlan

StatementNo. 800

23.2 The Proponent shall consult with DPaW, DER, DotEand DMP

Section 1.6.4

23.4 (i) Management measures to reduce the impacts frompipeline installation activities as far as practicable

Section 5.0

23.4 (ii) Management measures to ensure that pipelineinstallation activities do not cause Material or SeriousEnvironmental Harm outside the Terrestrial and

Marine Disturbance Footprints

Section 5.0

23.4 (iii) Performance Standards against which achievementof the objectives of this condition can be determined

Section 6.0

23.5 (i) The generation and dispersion of turbidity associatedwith pipeline installation activities

Section 5.5.3

23.5 (ii) Direct disturbance of habitat Section 5.5.1.1

23.5 (iii) Preventing harm to, or fatalities of turtles Sections 5.4.1,5.4.2, and 5.4.3

23.5 (iv) Program for pre and post pipeline installation seafloorsurvey of the Marine Disturbance Footprint and theareas at risk of Material or Serious Environmental

Harm due to the construction of the pipeline in Statewaters

Section 7.6

23.5 (v) Details of mooring pattern design, including rangeand bearing from fairleads of individual anchor dropsto show how the mooring pattern has been designedto limit impacts in coral habitat areas within Statewaters

Section 5.5.2

23.5 (vi) Details of typical mooring pattern design for otherthan coral habitat areas within State waters

Section 5.5.2

23.5 (vii) Procedures to minimise as far as practicable theimpacts resulting from anchoring, wire and chain

sweep, and wash from thrusters and propellers, onbenthic communities

Sections 5.5.2 and5.5.3.4

23.5 (viii) Details of proposed hydrotest water discharge andhow this will be managed to avoid Material or SeriousHarm to the marine environment

Section 5.9.3

23.5 (ix) A marine monitoring program to detect changes toecological elements outside the Marine DisturbanceFootprint for the Offshore Gas Pipeline identified in14.3v

Section 7.6.2

EPBCReference:2003/1294

and2008/4178

3.2.1 A description of the EPBC listed species and theirhabitat likely to be impacted by the components ofthe action which are the subject of that plan

Section 4.2.2

3.2.2 An assessment of the risk to these species from thecomponents of the action the subject of that plan

Sections 5.4.1,5.4.2, and 5.4.3


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MinisterialCondition

ConditionNo.

RequirementsSection

Reference in thisPlan

3.2.3 Details of the management measures proposed inrelation to these species if it is a requirement of thecondition requiring that plan

Sections 5.4.1,5.4.2, and 5.4.3

3.2.4 Details of monitoring proposed for that species if it isa requirement of the condition requiring that plan

Not a requirement

3.2.5 Performance standards in relation to that species if itis a requirement of the condition requiring that plan

Not a requirement

3.2.6 Management triggers in relation to that species if it isa requirement of the condition requiring that plan

Not a requirement

3.2.7 Protocols for reporting to the Department Section 7.7

16.2 The person taking the action must consult withDPaW, DER, DotE and DMP

Section 1.6.4

16.4 (I) Management measures to reduce the impacts from

pipeline installation activities in State waters, as faras practicable

Section 5.0

16.4 (II) Management measures to ensure that pipelineactivities in State waters do not cause Material orSerious Harm outside the Terrestrial and MarineDisturbance Footprints associated with those facilitieslisted in Condition 16.1

Section 5.0

16.4 (III) Performance Standards against which achievementsof the objectives of this condition can be determined

Section 6.0

16.5 (I) The generation and dispersion of turbidity associatedwith pipeline installation activities

Section 5.5.3

16.5 (II) Direct disturbance of habitat Section 5.5.1.1

16.5 (III) Preventing harm to, or fatalities of turtles and otherEPBC Act listed marine fauna

Sections 5.4.1,5.4.2, and 5.4.3

16.5 (IV) Program for pre and post pipeline installation seafloorsurvey of the Marine Disturbance Footprint and theareas at risk of Material or Serious EnvironmentalHarm due to the construction of the pipeline in Statewaters

Section 7.6

16.5 (V) Details of mooring pattern design, including rangeand bearing from fairleads of individual anchor dropsto show how the mooring pattern has been designedto limit impacts in coral habitat in State waters

Section 5.5.2

16.5 (VI) Details of a typical mooring pattern design for areasother than coral habitat in State waters

Section 5.5.2

16.5 (VII) Procedures to reduce as far as practicable, theimpacts resulting from anchoring, wire and chainsweep, and wash from thrusters and propellers, onbenthic communities in State waters

Sections 5.5.2 and5.5.3.4

16.5 (VIII) Details of proposed hydrotest water discharge andhow this will be managed to avoid Material or SeriousHarm to the marine environment; and

Section 5.9.3

16.5 (IX) A marine monitoring program to detect changes toecological elements outside the Marine DisturbanceFootprint for the Offshore Gas Pipelines in State

waters

Section 7.6.2


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Any matter specified in this Plan is relevant to the Gorgon Gas Development only if that matterrelates to the specific activities or facilities associated with that particular development.

1.6.3 Hierarchy of Documentation

This Plan will be implemented for the Gorgon Gas Development and the Jansz Feed GasPipeline via the Chevron Australasia Business Unit (ABU) Operational Excellence ManagementSystem (OEMS). The OEMS is the standardised approach that applies across the ABU tocontinuously improve the management of safety, health, environment, reliability, and efficiencyto achieve world-class performance. Implementation of the OEMS enables the Chevron ABU tointegrate its Operational Excellence (OE) objectives, processes, procedures, values, andbehaviours into the daily operations of Chevron Australia personnel and contractors workingunder Chevron Australia’s supervision. The OEMS is designed to be consistent with and, insome respects, go beyond ISO 14001:2004 Environmental Management Systems –Requirements with Guidance for Use (Standards Australia/Standards New Zealand 2004).

Figure 1-3 provides an overview of the overall hierarchy of environmental management

documentation within which this Plan exists. Further details on environmental documentationfor the Gorgon Gas Development and Jansz Feed Gas Pipeline are provided in Section 7.0 ofthis Plan.


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Figure 1-3 Hierarchy of Gorgon Gas Development Environmental Docume

Note: Figure 1-3 refers to all Plans required for Statement No. 800. The Plans are only relevant to EPBC Reference: 2003/1294 and 2approvals.

This Plan


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1.6.4 Stakeholder Consultation

Regular consultation with stakeholders has been undertaken by Chevron Australia throughoutthe development of the environmental impact assessment management documentation for theGorgon Gas Development and Jansz Feed Gas Pipeline. This stakeholder consultation hasincluded engagement with the community, government departments, industry operators, and

contractors to Chevron Australia via planning workshops, risk assessments, meetings,teleconferences, and the PER and EIS/ERMP formal approval processes.

This document has been prepared with input from:

Independent Reviewers: Mark Bailey, Director, Oceanica, reviewed this Plan and hiscomments were be incorporated or otherwise resolved.

Former Western Australian Department of Environment and Conservation (nowDepartment of Parks and Wildlife; DPaW): Workshops and meetings were heldinvolving the DEC and Chevron Australia personnel to discuss the scope and content ofthis Plan during its development. The DEC has reviewed draft revisions of this Planalong with the feedback of the independent reviewers. The DEC’s comments have been

incorporated or otherwise resolved. Former Commonwealth Department of Sustainability, Environment, Water, Population

and Communities (now Department of the Environment; DotE): SEWPaC havereviewed draft revisions of this Plan along with the feedback of the independentreviewers. SEWPaC’s comments have been incorporated or otherwise resolved.

Western Australian Department of Mines and Petroleum (DMP): DMP have revieweddraft revisions of this Plan along with the feedback of the independent reviewers. DMP’scomments have been incorporated or otherwise resolved.

Figure 1-4 shows the development, review and approval process for this Plan.

Additionally, consultations and/or notifications have been undertaken with the following

stakeholders, and will continue as required:

Apache Energy

Austral Fisheries

Charter Boats Users and Operators Association

Dampier Bunbury Pipeline

Department of Regional Development and Lands

Goldfields Gas Transmission

Mardie Station (CITIC Pacific Mining Management)

Native Title claimant groups:

Kuruma Marthudunera People

Yaburara and Mardudhunera People

Nickol Bay Professional Fishermens Association Inc

Pearl Producers Association

Pilbara Fish Trap

Recfishwest (WA recreational fishers representation)

Shire of Roebourne

Western Australian Department of Fisheries

Western Australia Fishing Industry Council (WAFIC).


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Figure 1-4 Deliverable Development, Review, and Approval Flow Chart

1.6.5 Public Availabil ity

This Plan will be made public as and when determined by the Minister, under Condition 35 of

Statement No. 800 and Condition 22 of EPBC Reference: 2003/1294 and 2008/4178.

Resolution of DEC,

SEWPaC and DMP

Review Comments by

Independent Expert

Reviewer (if required)

Scoping and

Development of

Deliverable

Issue

Report

Comments

Issue

Comments

Issue

Issue

Report

Consultation with DEC, SEWPaC,

DMP and Independent Reviewer

Internal Review Chevron Australia Key

Project Personnel and Subject MatterExperts

Independent Expert Review

Independent Expert Close-out Review

DEC, SEWPaC and DMP Review

DEC, SEWPaC and DMP Close-out

ReviewFinalise Deliverable

Draft Deliverable and

Independent Expert

Reviewer’s Report

Draft Deliverable

Revise

Draft Deliverable

Revise

Draft Deliverable

Consolidated DEC, SEWPaC

and DMP CommentsRevise (if required)

Minor revisions (if

required)

Minor revisions (if

required)

Final deliverable Issued for Ministerial (DEC, SEWPaC and DMP) Approval

Revise

ReviseRevise


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1.7 Format of the Plan

This Plan is structured as follows:

Section 2.0 summarises the legislative framework and relevant legislation applicable tothe proposed installation activities.

Section 3.0 describes the proposed installation activities.

Section 4.0 summarises the existing environment in the vicinity of the proposedinstallation activities.

Section 5.0 assesses the environmental risk associated with the proposed installationactivities.

Section 6.0 provides relevant environmental performance objectives, standards andmeasurement criteria for the proposed installation activities.

Section 7.0 details the implementation strategy to manage the impacts of the proposedinstallation activities.


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2.0 Appl icable Environmental Legislation

2.1 Regulatory Framework

This section briefly summarises the legal framework applicable to the proposed installationactivities. Key State and Commonwealth legislative requirements are outlined in Table 2-1 and

Table 2-2.

Table 2-1 Western Australian Legislative Requirements

Legislation Coverage Administering

Authority

Aboriginal Heritage Act 1972

This Act makes provision for the preservation, onbehalf of the community, of places and objectscustomarily used by, or traditional to, the originalinhabitants of Australia or their descendants.

Department ofIndigenous Affairs

Conservation andLand Management Act 1984

This Act makes provision for the use, protection andmanagement of public lands and waters and the floraand fauna within.

Department ofEnvironment andConservation

EnvironmentalProtection Act 1986

This Act provides for the prevention, control andabatement of pollution and environmental harm, forthe conservation, preservation, protection,enhancement and management of the environment.


Maritime Archaeology Act1973

This Act protects pre-1900 shipwrecks, maritimeinfrastructure, and maritime industrial sites in Statewaters. Under this Act, it is an offence to in any wayalter, remove, destroy, damage, or in any way dealwith, or assume the possession, custody or control of,

any maritime archaeological site, ship or relic withoutthe consent of the Trustee.

Western AustralianMaritime Museum

Petroleum(Submerged Lands) Act 1982

This Act is complementary to the Commonwealth Actand regulations, and regulates petroleum explorationand production, including environmental performance,in WA waters.

Department of Minesand Petroleum

Pollution of Watersby Oil & NoxiousSubstances Act1987

The purpose of this Act is to protect the sea and otherwaters from pollution by oil and noxious substances(POWBONS). This Act implements MARPOL 73/78and details the liabilities and penalties for dischargesfrom ships and enables WA to take measures torespond to spills.

Department of Transport

Western AustralianMarine (SeaDumping) Act 1981

This Act enacts the provisions of the InternationalConvention on the Prevention of Marine Pollution byDumping of Wastes and Other Matter 1972 in WAwaters. It provides for the protection of theenvironment by regulating the dumping into the sea,and the incineration at sea, of wastes and othermatter, and the dumping into the sea of other objects,and for other purposes.

Department of Transport

WildlifeConservation Act1950

This Act provides for the conservation and protectionof wildlife in WA.



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Table 2-2 Commonwealth Legislative Requirements

Legislation CoverageInternational Convention

Enacted Administering

Author ity

EnvironmentProtection andBiodiversity

Conservation Act 1999(EPBC Act)

This Act focuses on theprotection of matters of NationalEnvironmental Significance:

World Heritage properties

national heritage places

wetlands of internationalimportance (Ramsarwetlands)

listed threatened species andecological communities

migratory species (protectedunder internationalagreements)

nuclear actions

Commonwealth marine areas(including protection of thewhole marine ‘environment’)

the Great Barrier Reef MarinePark.

1992 Convention on

Biological Diversity and Agenda 21

Convention on InternationalTrade in EndangeredSpecies of Wildlife and Flora1973 (CITES)

Japan–Australia MigratoryBirds Agreement 1974(JAMBA)

China–Australia MigratoryBirds Agreement 1986(CAMBA)

Republic of Korea–AustraliaMigratory Birds Agreement2006 (ROKAMBA)

Convention on Wetlands ofInternational Importanceespecially waterfowl habitat1971 (Ramsar Convention)

International Convention onWhaling 1946

Convention on theConservation of MigratorySpecies of Wild Animals

(Bonn Convention) 1979

Department ofthe Environment(DotE)

EnvironmentProtection(Sea Dumping) Act 1981

This Act prevents the deliberatedisposal of wastes (loading,dumping, and incineration) atsea from vessels, aircraft, andplatforms.

Convention on the Prevention ofMarine Pollution by Dumping ofWaste and Other Matter 1972(London Convention)

DotE

HistoricShipwrecks Act 1976

This Act protects the heritagevalues of shipwrecks and relics.

Convention on Conservationof Nature in the South Pacific1976

Australia–Netherlands Agreement concerning oldDutch Shipwrecks 1972

Convention on Protection ofUnderwater Cultural Heritage2001

DotE

Navigation Act1912

This Act regulates ship-relatedactivities and invokes certainrequirements of the MARPOLconvention relating to equipmentand construction of ships.

International Convention for thePrevention of Pollution fromShips [MARPOL 73/78] (certainsections)

Department ofInfrastructure,Transport

OzoneProtection &SyntheticGreenhouse

GasManagement Act 1989

This Act regulates themanufacture, importation and

use of ozone depletingsubstances.

Montreal Protocol

United Nations (UN)

Framework Convention onClimate Change 1992

DotE


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Legislation CoverageInternational Convention

Enacted Administering

Author ity

Protection ofthe Sea(Harmful Anti-foulingSystems) Act2006

This Act regulates the use ofharmful anti-fouling systems

employed on boats and theireffects on the marineenvironment.

International Convention on the

Control of Harmful Anti-foulingSystems on Ships 2001

Department of

Infrastructure,Transport

Protection ofthe Sea(Prevention ofPollution fromShips) Act1983

This Act regulates ship-relatedoperational activities andinvokes certain requirements ofthe MARPOL convention relatingto discharge of noxious liquidsubstances, sewage, garbage,air pollution etc.

International Convention for thePrevention of Pollution fromShips [MARPOL 73/78]provisions and unifiedinterpretations of the articles,protocols and Annexes ofMARPOL 73/78, including theincorporation of all amendmentsthat have been adopted by the

Marine Environment ProtectionCommittee (MEPC) and haveentered into force

Department ofInfrastructure,Transport

Quarantine Act1908

This Act empowers authorities toquarantine goods, vessels andpeople to prevent theintroduction, establishment orspread of diseases or pestsaffecting human beings,animals, or plants.

International Convention for theControl and Management ofShips Ballast Water andSediments 2004

Department of Agriculture,Fisheries andForestry

2.2 Codes of PracticeCodes that have been taken into consideration in preparing this Plan include the AustralianPetroleum Production and Exploration Association (APPEA) Code of Environmental Practice(APPEA 2008) and the Australian Pipeline Industry Association (APIA) Code of EnvironmentalPractice (APIA 2009). The Codes represent good industry practices in the petroleum industry.


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3.0 Description of Activities

3.1 Location

The DomGas pipeline will be a 20-inch diameter dry gas export line that will supply domesticgas from the Gorgon Gas Development and Jansz Feed Gas Pipeline into the Dampier to

Bunbury Natural Gas Pipeline.

The DomGas pipeline route includes:

an offshore pipeline section approximately 59.4 km long from the LNG Jetty on the eastcoast of Barrow Island to the Australian mainland shore-crossing

an intertidal pipeline section approximately 12 km long from the mainland shore-crossing(mean sea level), through an intertidal zone, to the High Water Mark

an onshore pipeline section approximately 19.8 km long from the High Water Mark,cross country to tie in to the Dampier to Bunbury Natural Gas Pipeline south ofCompressor Station 1 (this component is addressed in the Mainland Onshore Domestic

Gas Pipeline Environmental Management Plan [Chevron Australia 2011a, as amendedfrom time to time]).

The offshore pipeline route traverses from the east coast of Barrow Island, in a south-easterlydirection to the mainland shore-crossing, approximately 90 km north-east of Onslow and 120 kmsouth-west of Karratha. From the mainland landfall, the pipeline route runs parallel andadjacent to the existing Apache easement and the twin Sales Gas pipelines (see Figure 3-1).

Pipeline installation activities and locations along the offshore and intertidal pipeline routes aredescribed in Kilometre Points (KPs), where:

the offshore pipeline route extends from Offshore KP 0, at the Barrow Island LNG Jetty,to Offshore KP 59.4, near the mainland shore-crossing

the intertidal pipeline route extends from Onshore KP 0 (Offshore KP 59.4), at themainland shore-crossing, to Onshore KP 12, at the High Water Mark.

Offshore pipelay activities are described as Shallow and Deep Water Pipelay, where:

Shallow Water Pipelay is from Offshore KP 48.4 to KP 59.4 at the mainland shore-crossing

Deep Water Pipelay is from Offshore KP 0 at the Barrow Island LNG Jetty to OffshoreKP 48.4.


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Figure 3-1 Location of the DomGas Pipeline


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Documents

Gorgon Emp Offshore Domestic Gas Pipeline Installation Management Plan