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Australia Pacific LNG Project Narrows Crossing Pipeline Environmental Management Plan Attachment 2 QCLNG Narrows Crossing Dredge Management Plan

QCLNG Narrows Crossing Dredge Management Plan Queensland Curtis LNG Project

QCLNG-BG03-ENV-PLN-000001 Rev. A

November 2010

Controlled Uncontrolled

Restricted Confidential

Uncontrolled when printed

Narrows Crossing Dredge Management Plan Queensland Curtis LNG Project

QCLNG Narrows Crossing Dredge Management Plan QCLNG-BG03-ENV-PLN-000001 Rev. A, November 2010

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DOCUMENT INFORMATION SHEET

TITLE: Narrows Crossing Dredge Management Plan

PURPOSE AND SCOPE: The purpose of this document is to outline the proposed methods for the management of the Narrows Crossing dredging spoil, which is required for the bundled installation of up to four 42‖ gas pipelines, in a single trench. This Dredge Management Plan (DMP) will be approved under the Coastal Protection and Management Act 1995 by the Department of Environment and Resource Management (DERM).

DOCUMENT VERIFICATION

Responsible:

Signature: Position:

Name: Date: November 2010

Accountable:


Name: Date: November 2010

Consulted:

Mebs Bobat, Project Engineer Mark Davis, Environmental Manager

Pauline Jacob, EIS Manager Jamie Reilly, Environmental Consultant

Informed:

Kasper Jacobsen, Narrows Crossing Project Manager

Endorsed:


Name: Date:

Revision Record

A 23-Nov-10 Revision MD

Rev Date Description Issued Checked Approved



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Table of Contents

TABLE OF CONTENTS............................................................................................................................................ 3

LIST OF ABBREVIATIONS ...................................................................................................................................... 5

REFERENCES ....................................................................................................................................................... 61

1.0 INTRODUCTION ............................................................................................................................................. 8

1.1 Purpose 8

1.2 Scope 8

1.3 Overview of the Project Area and Construction Sections 9

2.0 LEGISLATIVE , POLICY AND OTHER REQUIREMENTS .......................................................................... 11

2.1 Commonwealth Legislation 11

2.2 State Legislation 11

2.3 Other Requirements 17

2.4 Exemption of Royalty 17

2.5 Coordinator Generals Conditions of Approval 17

2.6 Environmental Values 18

2.7 Reviewed Literature 19

3.0 METHODOLOGIES – CONSTRUCTION AND DREDGING OPERATIONS ............................................... 20

3.1 Construction Methodology 20

3.2 Dredging Works – Methodology of Operations 24

3.3 Environmental Project Management and Consultation 26

4.0 EXISTING ENVIRONMENT .......................................................................................................................... 27

4.1 Geophysical and Geotechnical 27

4.2 Marine Habitats 27

4.3 Reef Habitats 30

4.4 Marine Water Quality 30

4.5 Marine Sediment Quality 34

4.6 Marine Fauna 35

4.7 Introduced Marine Species 36

4.8 Terrestrial Fauna and Flora 36

4.9 Shorebirds 36

5.0 PREDICTED ENVIRONMENTAL RISKS ..................................................................................................... 37

5.1 Sediment and Water Quality 37

5.2 Fauna Interaction 37

5.3 Introduced Marine Species 37

5.4 Acid Sulfate Soils 38

6.0 QCLNG NARROWS CROSSING MANAGEMENT STRATEGIES .............................................................. 39



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6.1 Overview 39

6.2 Environmental Management Plan 39

6.3 Management Strategy 1 – Water Quality 39

6.4 Management Strategy 2 – Marine Mammals Interaction 46

6.5 Management Strategy 3 – Marine Turtles Interaction 48

6.6 Management Strategy 4 – Introduced Marine Species 49

7.0 MONITORING AND INSPECTION ............................................................................................................... 50

7.1 Overview 50

7.2 Water Quality Monitoring Program 50

7.3 Invasive Marine Pest Management and Monitoring 52

7.4 Monitoring Schedule 54

8.0 REPORTING ................................................................................................................................................. 56

8.1 General Reporting 56

8.2 Exceedance Reporting 56

8.3 Final Reporting 57

8.4 Contingency Plan 57

APPENDIX 1. – GEOCHEMICAL CORE LOCATIONS AND ANALYSIS ............................................................. 60

APPENDIX 3. – DMP INFORMATION REQUIREMENTS ..................................................................................... 61



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LIST OF ABBREVIATIONS

3D Three dimensional

AASS Actual Acid Sulfate Soils

AHD Australian height datum (AHD =~MSL)

ANC Acid neutralising capacity

AQIS Australian Quarantine and Inspection Service

ASS Acid Sulfate Soils

ASSMP Acid Sulfate Soil Management Plan

ANZECC Australian and New Zealand Environment and Conservation Council

ARMCANZ Agriculture and Resources Management Council of Australia and New Zealand

AWQG ANZECC Water Quality Guidelines

BG BG Group

bgl Below ground level

BHD Backhoe Dredge

BTEX Benzene, Toluene, Ethyl-benzene and Xylene

CEMP Construction EMP

CMD Coastal Management District

CG Coordinator General (Qld State Government)

CPMA Coastal Protection Management Act 1995

CSD Cutter Suction Dredge

Cth. Commonwealth

CWG GPC Community Working Group

CZ CZ = AHD + 10m

DA Development Approval (SPA)

DEEDI Department of Employment, Economic Development and Innovation

DERM Department of Environment and Resources Management

DIP Department of Infrastructure and Planning

DMP Dredge Management Plan

DPA Dugong Protection Area

DPIF Department of Primary Industries and Fishing (part of DEEDI)

DWG Dredge Working Group

EIS Environmental Impact Statement

EMP Environmental Management Plan

EPA Environmental Protection Act 1994

EPBCA Commonwealth Environment Protection and Biodiversity Conservation Act 1999

ERA Environmentally relevant Activity (DERM)

FCC Fouling Control Coating

http://www.mincos.gov.au/favicon.ico



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FEED Front End Engineering Design

FFMP Flora and Fauna Management Plan

FHA Fish habitat area (declared under QFA)

FOC Fibre Optic Cables

GBR Great Barrier Reef

GBRCMP Great Barrier Reef Coastal Marine Park

GBRMP Great Barrier Reef Marine Park

GBRWHA Great Barrier Reef World Heritage Area

GPC Gladstone Port Corporation

GPS Global Positioning System

GRC Gladstone Regional Council

GSDA Gladstone State Development Area

HAT Highest Astronomical Tide

HDD Horizontal Directional Drilling

IMPS Introduced Marine Pest Species

ISQG Interim Sediment Quality Guidelines

KIW Kangaroo island Wetlands

LAT Lowest Astronomical Tide

LNG Liquefied Natural Gas

LPCI Laird Point on Curtis Island

LWM Low Water Mark

MCU Material Change of Use

MHWS Mean high water springs

MSL Mean sea level (~AHD)

mtpa million tonnes per annum

MOF Materials Offloading Facility

MSQ Maritime Safety Queensland

NAGD National Assessment Guidelines for Dredging

NCA Nature Conservation Act 1992

NIC-GSDA Northern Infrastructure Corridor – Gladstone State Development Area

NCPP Narrows Crossing Pipeline Project

NODGDM National Ocean Disposal Guidelines for Dredge Material

NTU Nephelometric Turbidity Unit

ORP Oxidation-reduction potential

OSPAR Oslo-Paris Convention for the Protection of the Marine Environment

OW Operational Works (SPA)

PGA Petroleum and Gas (Production and Safety) Act 2004



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PAH Poly-Aromatic Hydrocarbons

PASS Potential Acid Sulfate Soils

PCIMP Port Curtis Integrated Monitoring Program

PLR Phillipies Landing Road

POG Port of Gladstone

PSD Particle Size Distribution

QCLNG Queensland Curtis Liquefied Natural Gas

QFA Qld Fisheries Act 1994

QGC Queensland Gas Company

QWQG Queensland Water Quality Guideline 2009

RHM MSQ Regional Harbour Master Maritime Safety Qld (DTMR)

ROV Remotely operated vessel

ROW Right-of-Way

SDA State Development Area

sEIS supplementary Environment Impact Statement

SHB Split Hopper Barge

SPA Sustainable Planning Act 2009

SPL Strategic Port Land

SPP State Planning Policy

TBC To be confirmed

TCPA Transport Planning and Coordination Act 1994

TOMPA Transport Operations (Marine Pollution) Act 1995

TPH Total Petroleum Hydrocarbons

TSS Total Suspended Solids

TW Tidal waters (SPA/CPMA)

UCL Upper Confidence Limit

USL Unallocated State Land

VMA Vegetation Management Act 1999

WBDDP Western Basin Dredging and Disposal Project

WQ Water Quality

WQMP Water Quality Management Plan

WQMP* Water Quality Monitoring Program

WQMS Water Quality Management Strategy

WWBW Waterway barrier works (SPA)

http://www.derm.qld.gov.au/environmental_management/water/pdf/wq-guidelines2010.pdf



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1.0 INTRODUCTION

Queensland Curtis LNG is a major, integrated project to develop Queensland‘s coal seam gas resources for domestic and export markets. The main components of the proposal involve:

Expanding QGC‘s coal seam gas production in the Surat Basin in southern Queensland;

A 380 km buried natural gas pipeline from near Miles to Gladstone; and

A liquefaction plant at Curtis Island near Gladstone.

The dredging of shipping channels in Gladstone Harbour will be undertaken by the Gladstone Port Corporation (GPC) and is scheduled to begin in 2010 and is likely to overlap with the dredging operations of the pipeline trench.

It should be noted that this is a ‘living document’ however it will only be updated if any EPC Contractor design changes have not been sufficiently identified and managed by the relevant EMPs.

1.1 Purpose

This document has been developed to fulfil the requirements of both the Coordinator General‘s Report on the QCLNG EIS Condition 22 and Minister of Sustainability, Environment, Water, Populations and Communities approval of Environmental Protection and Biodiversity Conservation Act 1999 (referral 2008/4399) Condition 32.

The purpose of this document is to outline the proposed methods for the management of the Narrows Crossing dredging spoil, which is required for the bundled installation of up to four 42‖ gas pipelines, in a single trench. This Dredge Management Plan (DMP) will be approved under the Coastal Protection and Management Act 1995 (CPMA) by the Department of Environment and Resource Management (DERM).

1.2 Scope

An over-arching Draft DMP was prepared for the Supplementary Environmental Impact Statement (sEIS) to manage all dredge operations associated with the Queensland Curtis Liquefied Natural Gas (QCLNG) Project. This DMP is site-specific for dredging and material disposal activities associated with the QCLNG Project Narrows Crossing pipeline only.

This DMP covers The Narrows section of the Narrows Crossing pipeline route from near Friend Point on Kangaroo Island to Curtis Island near Laird Point. This DMP does not cover the excavation of the trench within the closed coffer dam between Targinie Creek and the Narrows, otherwise known as the Marshlands Section (refer 1.3). Spoil from the Marshlands Section is currently proposed to be excavated and disposed of using land based equipment and therefore is not addressed in this document. Due to the known presence of acid sulfate soils (ASS) the Marshlands Section, and minor ASS expected during horizontal directional drilling (HDD) of the Creeks Section, will be managed by a separate ASS Management Plan (ASSMP).

Spoil from The Narrows Section will be disposed of at the existing Fishermen‘s Landing reclamation area, which is managed by GPC under existing licence conditions.

The scope of this DMP also does not include dredging for GPC‘s Curtis LNG Precinct channels or swing basins, or minor works to be conducted elsewhere in the port by GPC in support of land-based transfer facilities. These works are described in GPC‘s Fisherman‘s Landing Northern Expansion EIS



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(released October 2009), Western Basin Dredging Project EIS (released November 2009), or other minor works approvals processes.

1.3 Overview of the Project Area and Construction Sections

The proposed Narrows Crossing Pipeline commences at MLV7 on the E05 Export Pipeline and will run close to Phillipies Landing Road, continue across Targinie and Humpy Creeks, and the marshland area of Kangaroo Island before crossing The Narrows from Friend Point to Laird Point just to the north of the planned APLNG (Origin/ConocoPhillips) Plant. The export pipeline is routed around the planned APLNG plant before termination at the QCLNG plant boundary.

The area of bundled construction between the LNG Proponents (QCLNG, GLNG/SantosPetronas, APLNG and SALNG/Shell), referred to as the Kangaroo Island Wetlands and The Narrows in the Coordinator-General‘s (C-G‘s) Report [Ref. 1], are within the proposed Northern Infrastructure Corridor – Gladstone State Development Area (NIC-GSDA) and is sub-divided into three construction sections. These three sections are commonly referred to as:

Creek Section – approximately 1.35km from the edge of the mainland across Humpy and Targinie Creeks onto the Marshland;

Marshland Section – approximately 1.7km from Targinie Creek across the tidal mudflats to Friend Point on Kangaroo Island; and

Narrows Section – approximately 1.25km across the tidal waterway of The Narrows between Friend Point and Laird Point on Curtis Island – the only section subject to this DMP. There will also be a 300m closed cofferdam at Laird Point.

The Creek Section and Marshland Section combine what is referred to as the ‗Kangaroo Island Wetlands‘ in the C-G‘s Report. In addition two sections exist adjacent to the above where supporting construction activities are taking place. These sections are known as:

Phillipies Landing Road (PLR) Section– this section starts from MLV7 crosses near the end of Cherniy Road and continues to Humpy Creek.

Laird Point on Curtis Island (LPCI) – this is a shore crossing area and the 50m temporary construction access corridors continues to the rear of the QCLNG facility site.

The above areas will support auxiliary construction activities such as laydown areas, stringing yards, pipeline transition area (land trench to HDD), ASS treatment areas and winch site setup.

The proposed gas pipeline alignments fall within the proposed NIC-GSDA corridor and are located toward the southern boundary of the corridor as indicated in Figure 1.1 below.



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Figure 1-1 - NIC-GSDA and Pipeline Alignments



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2.0 LEGISLATIVE , POLICY AND OTHER REQUIREMENTS

The DERMs ‗Approval of Dredge Management Plan Guideline‘ has been used as the basis for developing this DMP [Ref. 2]. Under the CPMA (refer 2.2), a DMP is required if ‗quarry material‘ is removed from below high water mark (HWM) or placement of spoil derived from its removal. Appendix 4 includes a table cross-referencing the DERM Guideline information requirements with relevant sections in this DMP (Ref 2). The DERM Guideline can be accessed at http://www.derm.qld.gov.au/register/p00935aa.pdf.

This section details the requirements of a DMP with respect to addressing key legislative requirements under Commonwealth, State and Regional jurisdiction. The NIC-GSDA is managed by the Department of Infrastructure and Planning (DIP) and therefore falls outside the jurisdiction of the Gladstone Regional Council (GRC) unless supporting construction activities take place outside the NIC-GSDA.

2.1 Commonwealth Legislation

Environment Protection and Biodiversity Conservation 1999

An Environment Protection and Biodiversity Conservation Act (EPBCA) referral (Referral Number 2008/4401) was made on 18 August 2009 regarding the Narrows Crossing. The project was determined to be a ‗controlled action‘ on 15 November 2008. Any impacts on matters of National Environmental significance (MNES) as listed under the EPBCA i.e. GBRWHA need to be addressed.

An EIS was prepared in 2009, which addressed both State and Commonwealth concerns. The EIS examined the nature and extent of impacts associated with the proposed marine activities.

Great Barrier Reef Marine Park

The Port of Gladstone is located within the Great Barrier Reef World Heritage Area (GBRWHA) however the project is outside the GBR Marine Park (GBRMP), which is on the eastern side of Curtis Island. The GBRWHA applies where there are impacts on MNES as listed in the EPBC Act.

The Port of Gladstone (POG) limits, including the proposed development, are located within Rodd‘s Bay Dugong Sanctuary B. The Narrows Island, including the marine environment surrounding these, is designated as National Estate. The Narrows is located at the northern limits of the Port.

The GBRMP Act 1975 is not relevant to the Narrows dredging as no sediment plumes are likely to be transported outside of the POG (refer GBRMPA Map).

2.2 State Legislation

State Development Public Works Organisation Act 1971

The QCLNG Project was determined by DIP to be a ‗significant project‘ under the State Development Public Works Organisation Act (SDPWOA) and this required an EIS which was completed for the QCLNG Project and the CG subsequently released their Report and Conditions based on this.

Great Barrier Reef Coastal Marine Park

Marine Parks (GBR Coast) Zoning Plan 2004 and subsequent boundary change in Marine Parks (Declaration) Regulation 2006 confirm that the pipelines are at least 200m south of the GBR Coastal

Marine Park (GBRCMP) boundary (23o44.905‘ South).

http://www.derm.qld.gov.au/register/p00935aa.pdf

http://www.reefed.edu.au/__data/assets/pdf_file/0009/18783/SDC_041206_Aug_09_General_Reference_A3_2.pdf



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Sustainable Planning Act 2009

The Sustainable Planning Act 2009 (SPA) replaced the Integrated Planning Act 1997 (IPA) on 18 December 2009. It controls all development in Queensland and provides the framework for Queensland‘s planning and integrated development assessment system (IDAS). SPA aims to balance community wellbeing, economic development and protection of the natural environment to achieve sustainable development.

A range of approvals may be required under the SPA for work associated with the Project. These may include development approvals (DAs) for operational works (OWs):

tidal works in a coastal management district (Coastal Protection and Management Act 1995)- yes, TWs in CMD

the removal and destruction of marine plants – yes, marine plants impacted

OWs for waterway barrier works (Fisheries Act 1994) – no, no creek flows cut-off by WWBWs

OWs within a declared fish habitat area (FHA) – no, no FHA in the project area

a material change of use (MCU) of premises for environmentally relevant activities (ERAs) – yes, LU change from unallocated state land (USL) to state development area (SDA).

clearing of native vegetation (Vegetation Management Act 1999) – n/a to marine plants.

The proposed dredging operation does not involve the construction of any physical barrier preventing existing access to the foreshores near the work.

The Narrows Crossing dredging activities will not unreasonably restrict usability of the harbour waters by either recreational or commercial vessels, apart from statutory security and safety requirements. Access will be limited on a temporary basis during dredging activities.

Environmental Protection Act 1994

The purpose of the Environmental Protection Act 1994 (EPA) is to protect Queensland‘s environment while allowing for development that improves the total quality of life, both now and in the future, in a way that maintains ecological processes on which life depends. The protection of Queensland‘s environment is to be achieved by an integrated management program that is consistent with ecologically sustainable development.

The proposed works will trigger an ERA (16 1 b – Extractive Activity) which is included in the EA application to DERM. Notwithstanding this, QGC has a responsibility under the DERM to ensure that no environmental harm (serious or material) occurs as a result of its activities.

Coastal Protection and Management Act 1995

The Coastal Protection and Management Act 1995 (CPMA) objectives are to:

Provide for the protection, conservation, rehabilitation and management of the coast, including its resources and biological diversity

Have regards to the goal, core objectives and guiding principles of the National Strategy for Ecologically Sustainable Development in the use of the coastal zone (CZ = AHD + 10m)

Provide, in conjunction with other legislation, a coordinated and integrated management and administrative framework for the ecologically sustainable development of the coastal zone



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Encourage the enhancement of knowledge of coastal resources and the effect of human activities on the coastal zone.

A development approval for tidal works/development approval for works in a coastal management district required under Schedule 3 of the SPA for operational works that are tidal works, and for operational works that are located within a CMD, are both assessed under the CPMA.

Fisheries Act 1994

The Queensland Fisheries Act 1994 (QFA) promotes ecological sustainability through accountability in terms of the use, conservation and enhancement of the community's fisheries resources and fish habitats. The QFA regulates the taking of, causing damage to and disturbance of marine plants, including mangroves, waterway barriers that impede the passage of fish, and development in a fish habitat reserve.

The objectives of the QFA include:

Ensuring fisheries resources are used in an ecologically sensitive way

Achieving the optimum community, economic and other benefits obtainable from fisheries resources

Ensuring access to fisheries resources is fair.

A development approval is required for the removal and destruction of marine plants. The QFA requires that a permit be obtained prior to causing a disturbance to, or removal of marine plants. Development approval for waterway barrier works (WWBW) is not required given that bridging of the creeks will not impede natural tidal flows.

Seagrasses are not present within the dredge footprint, however approx. 3ha (0.4% of local seagrass beds) will be impacted by construction works on either side of the Narrows.

Mangroves are not present within the proposed dredge area.

FHAs are not present within, or immediately adjacent to any proposed works. However impacts on fish habitats will be assessed as conditioned by the CG.

Nature Conservation Act 1992

The purpose of the Nature Conservation Act 1992 (NCA) is to provide legislative protection to Queensland threatened flora and fauna. The NCA is administered by DERM. The dredge operation will comply with applicable requirements of the NCA and associated operational policies and guidelines, although Narrows Crossing dredging activities are not anticipated to significantly impact on species listed under the NCA.

Vegetation Management Act 1999

The Vegetation Management Act 1999 (VMA) provides for the management of remnant vegetation, high value regrowth vegetation and essential habitat areas. A SPA DA, assessed via the VMA, may be required to clear native vegetation however under the Petroleum and Gas (Production and Safety) Act 2004 (PGA), petroleum activities associated within petroleum tenures are exempt from approval under the VMA.

It should be noted that neither the NCA nor the VMA have specific protection or management provisions for marine plants. This VMA does not apply to dredging works.



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Transport Infrastructure Act 1994

The overall objective of the Transport Infrastructure Act 1994 (TIA) is, consistent with the objectives of the Transport Planning and Coordination Act 1994 (TPCA), to provide a regime that allows for and encourages effective integrated planning and efficient management of a system of transport infrastructure. The TIA and its Regulation 2005 (Schedule 1) set the limits for the POG.

Transport Operations (Marine Pollution) Act 1995

The overall purpose of the Transport Operations (Marine Pollution) Act 1995 (TOMPA) is to protect Queensland‘s marine and coastal environment by minimising deliberate and negligent discharges of ship-sourced pollutants into coastal waters. This purpose is to be achieved, primarily, by giving effect to relevant provisions of the following annexes of MARPOL:

Annex I (which deals with pollution by oil)

Annex II (which deals with pollution by noxious liquid substances in bulk);

Annex III (which deals with pollution by harmful substances in packaged form);

Annex IV (which deals with pollution by sewage)

Annex V (which deals with pollution by garbage).

Furthermore the purpose of TOMPA is also to be achieved by:

providing an approach to protecting Queensland‘s marine and coastal environment from ship-sourced pollutants complementary to the approach of the Commonwealth and the other States

making provision about the discharge of sewage from ships

giving power to deal with shipping casualties that are polluting, or threatening to pollute, coastal waters

enhancing, through education processes, industry and community awareness of the effects of ship-sourced pollutants on Queensland‘s marine and coastal environment

providing for the imposition of severe penalties on persons who pollute Queensland‘s marine and coastal environment in contravention of this TOMPA.

The EPC Contractor will require approval under the Marine Construction Standard for Activities in Gladstone Harbour from Maritime Safety Queensland (MSQ).

State Environment Protection Policies

The project must also comply with all relevant Queensland State Environment Protection Policies and Waste Management Policies during its operations. These include:

http://www.msq.qld.gov.au/~/media/msqfiles/home/publications/pdf_gladstone_construction_document.pdf

http://www.msq.qld.gov.au/~/media/msqfiles/home/publications/pdf_gladstone_construction_document.pdf



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State Coastal Management Plan 2001 (refer draft State Coastal Management Plan 2010)

State Planning Policy (SPP2/02) Planning and Managing Development ASS

Environmental Protection (Air) Policy 1997

Environmental Protection (Noise) Policy 2008

Environmental Protection (Water) Policy 1997

Environmental Protection (Waste) Policy and Regulation 2000.

Regional Plans

Port of Gladstone Western Bay Master Plan 2010 (DIP)

Development Scheme for GSDA 2008

Curtis Coast Regional Coastal Management Plan 2003

POG Western Bay Master Plan 2010

The Plan was prepared in accordance with the SDPWOA. It notes that Kangaroo Island is located at the northern edge of the Western Basin and adjacent to the GBRCMP. Kangaroo Island is identified as being part of a key environmental area that stretches from Graham Creek, across The Narrows and westwards. Planning of the pipeline corridor through the GSDA is a core element in establishing an LNG industry in Gladstone. The CG assessed pipeline route corridor alignments (the current alignment was agreed by all LNG proponents). In making the above determination the Queensland Government considered the following constraints:

Surrounding environment, including the Great Barrier Reef Coast Marine Park to the north

Dredging requirements and the location of future port works

Pipe security

Proximity to possible future bridge infrastructure. The methods of constructing/laying the gas pipelines (e.g. trenching, etc.) within the corridor was identified by the proponents as part of each project‘s EIS. The dredged material from the Western Basin is generally a complex matrix of silts, gravels, and clays which have proven to be suitable for reclamation. In some location the dredge spoil could contain acid sulfate soil which will be addressed by the proponent‘s environmental impact statement and managed in accordance with the State Planning Policy SP2/02 and associated guidelines. Development Scheme for GSDA 2008 This Development Scheme may be cited as the Development Scheme for the GSDA prepared pursuant to the SDPWOA and applies to any development within this SDA.

Curtis Coast Regional Coastal Management Plan 2003

The Curtis Coast Regional Coastal Management Plan 2003 (Curtis Coastal Plan) was developed under the CPMA. The purpose and effect of the Curtis Coastal Plan describes how the coastal zone in the Curtis Coast region is to be managed within the policy framework established by the State Coastal Management Plan — Queensland‘s Coastal Policy (State Coastal Plan). There is currently a new draft State Coastal Management Plan however the Curtis Coast Plan is not being replaced.

Refer map below for jurisdictions within the POG and Narrows crossing in particular.

http://www.dip.qld.gov.au/resources/plan/gladstone/western-basin-master-plan.pdf

http://www.dip.qld.gov.au/resources/plan/land/state_development_areas/gladstone/gsda-development-scheme.pdf

http://www.derm.qld.gov.au/environmental_management/coast_and_oceans/coastal_management/regional_coastal_management_plans/curtis_coast.html

http://www.derm.qld.gov.au/environmental_management/coast_and_oceans/coastal_management/regional_coastal_management_plans/curtis_coast.html



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2.3 Other Requirements

Extraction/Excavation and Acid Sulfate Soils

Detailed studies indicate the ASS/PASS is not an issue for the Narrows Section dredging program. An ASSMP for excavated material removed from the coffer dams is provided as a separate document.

Surface Water Quality

A specific water quality monitoring program (WQMP*) will be developed to monitor the predicted impacts of dredging and disposal activities for the Narrows Crossing. A proposed monitoring program is outlined in Section 7.

QGC will provide a copy of the results of the Water Quality Monitoring Program (WQMP*) to DERM within 28 days of dredging completion.

Other Matters to Consider

Appendix 1 contains acknowledgement notices from the Maritime Safety Queensland‘s Regional Harbour Master (RHM MSQ) and the Department of Employment, Economic Development and Innovation (DEEDI).

2.4 Exemption of Royalty

GPC is exempt from payment of a royalty if the material to be disposed of is not sold. The dredged spoil will not be sold by GPC. Under Section 9 (3) of the Coastal Regulation [Ref. 4]:

No royalty is payable by a port authority of quarry material removed: (1) to maintain or improve navigational channels or navigation in its port if the material is disposed of –

(a) in an area associated with port activities and approved by the Minister of the department through which the Transport Infrastructure Act 1994 is administered; and

(b) under relevant statutory environmental controls; or

(2) to reclaim land that is, or is proposed to be, strategic port land (SPL) under the TIA.

The pipeline dredged spoil will be transported to GPCs reclaim area (Fisherman‘s Landing or Western Basin) which will eventually become SPL and therefore be exempt from royalty payment.

2.5 Coordinator Generals Conditions of Approval

The QCLNG Supplementary EIS (sEIS) was submitted in February 2010 [Ref. 5]. The sEIS examined potential dredging impacts associated with the Narrows Crossing. Following submission of the sEIS, the Coordinator General (CG) examined all submissions and prepared a report which was released in June 2010. Conditions attached to dredging activities include:

For the crossing of The Narrows and associated intertidal wetlands, both the GLNG and APLNG EIS reports make a strong case that, on the basis of the apparent high cumulative impacts of multiple dredging projects for the crossing of 4 pipelines (which could be up to 1 kilometre wide), a ‗bundled‘ crossing should be undertaken with the obvious benefit of reducing cumulative impacts on marine ecology.

The CG supports this view and declares that it is a requirement of proponents to investigate a bundled pipe crossing based generally on a proposal which was prepared by the industry in February 2010. A discussion and conclusion on this subject is dealt with in a separate section of this report and a



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condition (22) is provided. The objective of the condition is to ensure that all proponents may have the opportunity of participating in a method of pipeline crossing which both minimises the cumulative impacts of multiple pipeline crossings, and which ensures that each proponent can achieve a pipeline solution in time to service their project.

Condition 22 states that the draft EMP must contain, but not necessarily be limited to (10.) cumulative impacts arising from dredging for The Narrows pipeline crossing and dredging for the Port of Gladstone Western Basin Dredging Project (refer to the Narrows Crossing Dredge Plume Dispersion Modelling report). Appendix 3 Gas transmission pipeline Part 2- CG imposed conditions for The Narrows: Condition 16 Subject to condition 17 construction of the pipeline across the across the Kangaroo Island wetlands (KIWs) and The Narrows must be undertaken concurrently with construction of the pipelines of other LNG proponents as part of a bundled pipeline construction methodology. Condition 17 1. the proponent shall negotiate in good faith with any proponent of a project which has been declared a significant project by the CG and has a proposed gas transmission pipeline from the mainland to Curtis Island (LNG proponents) with a view to reaching agreement on a bundled pipeline crossing of the KIWs and The Narrows. 2. the period for the proponent and other LNG proponents to successfully negotiate an agreement for a bundled pipeline crossing expired on 1 November 2010 3. in the event that an agreement is not reached within the set time or the proponent cannot accept the agreement reached among the other parties and the Coordinator-General is satisfied that the negotiation process has been conducted reasonably, then the proponent shall submit details of its position, including the information requested in Conditions 21 and 22 below, to the CG for consideration and approval of an alternative pipeline crossing proposal. Any such proposal shall: a. not compromise the pipeline crossing plans of other LNG proponents b. result in aggregate environmental impacts in the KIWs and The Narrows area that are not significantly worse than impacts that would arise should all proponents participate in a bundled pipeline crossing. Condition 18 The bundled pipeline route across the KIWs and The Narrows shall be contained within the corridor identified in drawing WR_QGC_00794 Rev. E to DIP.

This DMP only forms one part of the CG requirements for the content of Environmental Authority application and its EMPs have been developed for specific aspects of potential environmental impact.

2.6 Environmental Values

Coastal wetlands of state significance are found within the POG, fringing the mainland and harbour islands. Some mangroves and seagrass meadows exist in or near the Narrows Crossing dredging program.

Seagrass

A description of seagrass habitats within the vicinity of the Project area is provided in Section 4. Predicted impacts to seagrass within the vicinity of the Project area are provided in Section 5. Proposed management, mitigation and monitoring of predicted impacts to seagrass is detailed in Section 6. Seagrass health in Port Curtis will be monitored annually through the Port Curtis Integrated Monitoring Program (PCIMP).



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Mangroves

A description of mangrove habitats within the vicinity of the Project area is provided in Section 4. Predicted impacts to mangroves within the vicinity of the Project area are provided in Section 5. Proposed management and mitigation of predicted impacts to mangroves is detailed in Section 6. A permit to remove marine plants protected under the QFA, has been lodged by QGC, and at the time of preparation of this DMP is pending approval.

Corals

A description of coral habitats within the vicinity of the Project area is provided in Section 4. Predicted impacts to coral within the vicinity of the Project area are provided in Section 5. Proposed management, mitigation and monitoring of predicted impacts to corals is detailed in Section 6.

Marine Fauna

A description of marine fauna potentially occurring within the vicinity of the Project area is provided in Section 4. Predicted impacts to marine fauna within the vicinity of the Project area are provided in Section 5. Proposed management and mitigation of predicted impacts to marine fauna is detailed in Section 6.

Benthic

World Heritage values that may require consideration with regard to the proposed action include benthic habitats and organisms. The Narrows Crossing dredging is unlikely to have a significant impact on benthic habitats and organisms. A summary of predicted impacts to sensitive benthic habitats is provided in Section 4. Proposed management, mitigation and monitoring (Section 6 and 7) measures are designed to reduce predicted impacts to benthic habitats.

2.7 Reviewed Literature

Aside from the legislation and policies previously cited the following were also considered in the development of this DMP:

National Assessment Guidelines for Dredging 2009 (DEWHA, 2009)

Australian and New Zealand Guidelines for Fresh and Marine Water Quality (ANZECC & ARMCANZ 2000)

Queensland Water Quality Guidelines (2009)

Port Curtis Integrated Monitoring Program (2001)

Australian Ballast Water Management Requirements 2008

National Biofouling Management Guidelines for Commercial Vessels 2009

National Biofouling Management Guidelines for Non-Trading Vessels 2009

OSPAR Guidelines for the Management of Dredged Material (OSPAR 1998).



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3.0 METHODOLOGIES – CONSTRUCTION AND DREDGING OPERATIONS

The area of bundled construction between the LNG Proponents, referred to as the Kangaroo Island Wetlands (KIWs) and The Narrows in the CGs Report [Ref. 1], is sub-divided into three construction sections. These three sections are commonly referred to as:

Creek Section – approximately 1.35km from the edge of the mainland near Phillipies Landing Road across Humpy and Targinie Creeks onto the marshland

Marshland Section – approximately 1.7km from Targinie Creek across the tidal mudflats to Friend Point, and

Narrows Section – approximately 2.45km across the tidal waterway of The Narrows between Friend Point on Kangaroo Island and Laird Point on Curtis Island – is the only section subject to this DMP.

Of these three sections only the construction method for the Narrows Section is relevant to the dredging works described in this DMP.

3.1 Construction Methodology

This section outlines the methodologies for construction and dredging works within The Narrows Section as identified in the Narrows Crossing scope of work. Figure 3-1 provides an overview schematic of the Narrows Crossing area and sections

Figure 3-1 - Narrows Crossing Overview



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The Narrows Section

Narrows dredging will be executed by a Backhoe Dredger (BHD) working off a spud piled barge (refer Figure 3-2 and Figure 3-3).

Figure 3-2 - Typical Spud Piled Backhoe Dredger

Figure 3-3 - Typical Backhoe Dredging Operation

The Narrows Section target trench profile is shown below (refer Figure 3-4).

Figure 3-4 - Narrows Section Trench Profile



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Pipeline separation of 1m can be controlled via the bundle technique. However, pipeline separation between the bundles is expected to be larger at around 5m as the bundles are installed in two operations. There are significant project risks with attempting to pull 4 large diameter pipelines in one operation across a high current waterway. Pulling 2 pipelines at a time is considered a safer and more manageable operation, but will require larger separation between the bundles.

Trench depth is governed by burial requirements, which is 1.2m minimum as per AS2885.1 (Australian Standard (2007) Pipelines – Gas and Liquid Petroleum; Part 1 – Design and Construction), the design code. Additional over-dredging will be required to ensure the trench has sufficient depth to meet the code burial requirement. This over-dredging may be 0.5-1.0m.

Simultaneously with the dredging operation a temporary shore transition cofferdam will be constructed near Friend Point and on Curtis Island. The shore transition cofferdam (refer Figure 3-5) will assist with stabilising the shore crossing and minimising trench excavation requirements and maintenance dredging. It will be extended out to Lowest Astronomical Tide (LAT); thereby ensuring the trench does not become exposed to air to avoid AASS generation.

Figure 3-5 - Friend Point Shore Transition Cofferdam

NOTES: MLWS- Mean low water Springs (approx. 1m above LAT), RAD HOC Curve- Radius Overbend Curve, SAC Curve- Sagbend Curve.

Immediately prior to the pipeline pulling operation the pull wires will need installing across the Narrows.

This will take place off a wire-lay barge, which will lay the wires from Friend Point to Curtis Island. The wire-lay operation will be supported by a tug to assist with maintaining barge position and relocation. The barge may be an anchor type vessel, whereby some barge movement would be possible within the anchor pattern.

It is imperative the pull wires are installed in a straight line. To facilitate this, the wirelay barge will be equipped with Global Positioning System (GPS) and local transponders may also be installed to assist with determining vessel and wire position (refer Figure 3-6).



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Figure 3-6 - Wirelay Operation

NOTES: AHT- Anchor Handling Tug, c/w- complete with.

The buoyancy modules are typically 200m long each with valving at each end to allow controlled flooding and dewatering as required to control pipeline bundle buoyancy. The buoyancy modules will be installed along the entire length of the pipeline bundle. Buoyancy control is necessary as pipeline bundle elevation requirement varies across the length of the pulling operation. Across the Narrows Section the pipeline bundle will be required to be negatively buoyant and drag against the seafloor. This is necessary to ensure adequate stability in the Narrows cross currents. Following completion of the pulling operation the buoyancy modules will be removed using either a Remotely Operated Vehicle (ROV) or divers. Refer to Figure 3-7 for pipeline bundle configuration.

Figure 3-7 - Pipeline Bundle Configuration

NOTES: PE- Polyethylene



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3.2 Dredging Works – Methodology of Operations

To facilitate the construction activities described in Sections 3.1, under the preferred option the EPC contractor will dredge up to approximately 155,000 m3 of material from The Narrows Section (refer to Table 3-1), with preferred disposal to the proposed Western Basin reclamation area. Alternatively, a four in two trench methodology will generate approximately 230,000m3 dredge spoil for disposal. Determination of the final disposal location is subject to GPC‘s regulatory approvals for the disposal sites and coordination with the GPCs Dredging program and contractors.

If approved the disposal of the dredge spoil to the Fisherman‘s Landing (FL153) reclamation area will be undertaken in accordance with GPC‘s existing reclamation approval, issued under Section 91 of the now repealed Harbours Act 1955 through the TIA, and as such does not form part of the DA for an MCU for ERA 16.

QGC are seeking a currency period for the DMP of 2 years. The current proposed timing for dredging and reclamation operations are planned for a four to five month period from November 2011 to February 2012. More specific details relating to the timing of the dredging program will be provided as details with the EPC contractor are finalised.

The transportation options and logistics for the movement and disposal of dredge spoil will also be finalised at that time.

DERM and MSQ will be notified within 7 days of commencement and on completion of dredging.

Table 3-1 - Narrows Section Pipeline Trench Option Summary (refer to Table Notes 1,4 and 7)

Pipeline Trench Options 4 in 1 Trench2 4 in 2 (2 in each)

Trenches

Depth (m) 5 5

Trenches (#) 1 2

Base & Top Width (m) 16/33 8/66

Angle of Slopes (o) 30

o (2 slopes) 30

o (4 slopes)

Length5 (m) 1250 1250

Volume Removed3 (m

3)

(Narrows Section approx. volume)

155,000 230,000

Table Notes: 1. Near shore depth decreases but this has not been taken into account (resulting in an overestimate) 2. 5m pipe separation is likely to be in excess of what is required 3. Volume is volume excavated only 4. Assumed pipe diameter of 1.5m 5. Length is length between the Friend Point and Laird Point coffer dams 6. Total volume removed and backfilled 7. All data subject to confirmation by the dredging contractor



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Dredging and Spoil Disposal Options QGC has explored reclamation, ocean disposal and on-land containment as feasible options for disposal of material obtained from the proposed dredging requirements for the QCLNG Project. The following discusses these options and why preferred option has been chosen.

Preferred Dredging Methodology

For the Narrows Crossing dredging operations to be performed in the Narrows Section, QGC proposes to trench using one or several Backhoe Dredges (BHDs). BHDs will be supported by either Split Hopper Barges (SHB) or slurry transfer pipe to facilitate transfer of material to the disposal site.

For the Narrows Section, dredge spoil will be excavated with a 5m3 to 7m3 bucket from a spud piled backhoe dredger (refer Figure 3-2) with the dredge spoil located into a hopper barge.

The dredge spoil will be taken away for direct disposal to reclaim area.

A summary of Narrows Crossing pipeline trench option is set out in Table 3-1. The preferred option is 4 pipelines in 1 trench. This option, to accommodate multiple pipelines in a single construction trench, requires a wider trench and generates more dredge spoil than the original single pipeline options outlined in the QCLNG Project EIS/sEIS, but has a smaller footprint than the alternative 4 pipelines in 2 trenches option.

QGC has explored reclamation, ocean disposal and on-land containment as feasible options for disposal of material obtained from the proposed dredging requirements for the QCLNG Project. The existing Fisherman‘s Landing cells have the capacity to accommodate the estimated 155,000m3 of dredge spoil originating from dredging operations at the Narrows Crossing.

The availability of reclamation areas will depend on timing of approvals and necessary modifications of the existing bund walls.

Offshore Placement (non-preferred option)

Under provisions of the Sea Dumping Act 1998 (Cwth), GPC has an approved Sea Dumping Permit for marine disposal of dredging material at a designated site located within the outer limits of the Port boundaries. This site is known as the East Banks disposal site which was established in 1980. QGC has requested that GPC consider placing dredged material from the Narrows Crossing dredging in its East Banks site only if Fishermans Landing is unavailable when required to meet schedule (Q3 2011 to Q1 2012). If Fishermans Landing is unavailable, and consent is granted to use the GPC spoil ground, barges will be employed for transfer of the dredged material.

If offshore disposal is undertaken self propelled barges or tug assisted barges will travel in a south easterly direction until they reach the Targinie Channel. The barges will then follow the shipping channel out of the harbour directly to the East Banks Sea Disposal Site.

Once the split hopper barge has reached optimum capacity for the type of material being dredged, the barge will head to the sea disposal site. The material will be dumped by splitting the barge and allowing the material to fall out through the gap between the hulls. The barges move very slowly over the sea disposal site when discharging the dredged material in order to evenly distribute the material. The barge/tug operators place the material over the entire disposal area, recording the co-ordinates of their dumping in their dredge logs and electronically recording their tracks over the site as they dump the material.



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Spoil Disposal

Geotechnical studies and engineering work carried out by QCLNG has confirmed that The Narrows spoils cannot be re-used as backfill due to risk of liquefaction.

Therefore, all spoil will require disposal after trench excavation/dredging.

3.3 Environmental Project Management and Consultation

Appropriate levels of consultation and in communication between regulatory bodies and relevant stakeholder parties will be undertaken by QGC and its nominated EPC contractor, and will include GPC, government agencies and GPC Community Working Group (as required by works program). This will include the management of issues that arise during the dredging works, water quality monitoring and reporting as required by conditions of approval.

The GPC CWG will be used as a forum for community consultation for the Narrows Crossing dredging and material disposal. The GPC CWG meets quarterly. The CWG will be provided with information on completed, current and future dredging and disposal operations, any monitoring exceedances, any management and mitigation measures that have been implemented, and any other aspects of dredging and disposal management and monitoring that may be relevant.



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4.0 EXISTING ENVIRONMENT

A detailed description of the existing marine environment is presented in the QCLNG Project EIS and supplementary EIS, Chapter 5, Volume 8. A high level overview of the marine environment, in and around the project area, is presented in the following sections to provide context to the management measures presented in Section 6. A detailed assessment of Commonwealth EPBC MNES and DERM interests have been addressed in the Summary Report MNES Bundled Pipeline Crossing of ‘The Narrows’ QCLNG-BX00-ENV-000017 submitted to DEWHA and the EA application of which this DMP forms part.

4.1 Geophysical and Geotechnical

Figure 4-1 shows the stratigraphy of the Narrows Crossing. For the purposes of trenching design, only depths of up to 3.0 m below ground level (bgl) are of interest. The soil stratum indicates that alluvial material is the dominant component with thickness from approximately 2m to 20m. The alluvial soils are gravel/clay/sandy clay (intermediate plasticity fines). More recent geophysical and geotechnical tests have been performed, and initial indications suggest suitability for trenching in all areas [Ref. 8]. The Narrows Section data indicates marine deposits of ―very soft to firm‖ consistency surface layers with an undrained strength of 10 to 100 kPa, with underlying alluvial deposits of ―stiff to hard/medium dense to very dense‖ consistency with an undrained shear strength of 10 to >300 kPa.

4.2 Marine Habitats

Seagrass

Within the POG the following six species of seagrass have been identified:

1) Halodule uninervis

2) Halophila ovalis

3) Halophila decipiens

4) Halophila minor

5) Halophila spinulosa

6) Zostera capricorni

Regular seagrass monitoring within the Port of Gladstone, has been undertaken by the Marine Ecology Group of Fisheries Queensland [Ref. 9]. This regular monitoring expands on baseline studies conducted in 2002, and in 2007 was included as an annual monitoring theme in the PCIMP. Mapping of seagrass habitats was again undertaken in 2009.

The 2002 baseline seagrass survey, updated in 2009, identified coastal seagrass meadows in small patches along the south-western coastline of Curtis Island [Ref. 3] (Figure 4-2). These beds were categorised as ephemeral, sparsely populated with low biomass. Mapping undertaken in November 2009 indicated that many of these meadows identified in baseline surveys had shrunk in size, minimizing the amount of seagrass which now occurs within the dredge footprint for the Narrows Crossing. However, seagrass is known to have occurred in this area and could reasonably be expected to grow in the absence of disturbance.

The more recent surveys have identified consistent changes between seagrass meadows within the Port of Gladstone and at reference sites in Rodds Bay. These changes have been linked to a combination of climate factors, tidal exposure, seagrass resilience and capacity for recovery. In addition, surveys of seagrass throughout Queensland have demonstrated that fluctuating patterns of distribution and abundance are common [Ref. 10].



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The dredging portion of the Narrows will not impact seagrasses however the coffer dams will impact less than 0.5% of the seagrasses areas identified directly within the pipeline ROW.

Figure 4-1 – Narrows Crossing Stratigraphy


Narrows Crossing Dredge Management Plan QCLNG-BG03-ENV-PLN-000001 Rev. A, November 2010

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Figure 4-2 - 2009 Port Curtis Seagrass Distribution Map



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4.3 Reef Habitats

The nearest coral reefs of significance are located in the Capricorn Bunker Group of Offshore Islands, approximately 60 km north-east of Gladstone. In this area reefs occur as a series of isolated platform reefs, many of which surround small vegetated islands.

Locally, the benthic reef fauna and flora assemblages of Port Curtis exist within the constraints imposed by variable water (and air) temperature range, large tidal range, strong tidal currents and low light levels and associated high suspended solid concentrations. Most light-dependent reef-building corals, seagrass and seaweed (macroalgae) species therefore occur from the lower intertidal area to a depth not usually exceeding 2 m below low-water datum.

Previous work performed by others and investigations performed by QGC have not identified reef habitat in the area between Friend Point and Laird Point.

At the turbid fringing reef sites near Curtis Island and approximately 1-2 km south-east of the Narrows Crossing Pipeline, hard coral cover was found to be low (average of 4 per cent) [Ref. 11].

Mangroves

Fourteen species of mangroves are reported from the Port of Gladstone region. The mangrove assemblage is dominated by Rhizophora stylosa. Ceriops tagal and Avicennia marina are also well represented, generally on the landward side of the assemblage. These mangrove assemblages are considered to be in a healthy state. The majority of mangroves identified in the project area dominate the mid-to-upper intertidal zones, fringing much of the mainland and Curtis Island between mean sea level (MSL = AHD @ ~2.5m) and mean high water springs (MHWS = ~4.5m).

Extensive mangroves extend along the Curtis Island coastline from Graham Creek to Hamilton Point to the south beyond the Project area. Intertidal mangrove habitat comprises 31.7 per cent of all habitat types in the Port of Gladstone, covering an area of 6,736 ha. Areas of mangrove, predominantly Rhizophora closed forest, are also found along the coastline of Curtis Island close to the proposed QCLNG marine facilities, and also adjacent to, the south, north and inhabiting Passage Islands.

The Narrows dredging will not impact mangroves.

4.4 Marine Water Quality

Existing Information

Water quality (WQ) has been monitored during previous dredging projects undertaken within the POG. In addition, WQ is continuously monitored using automatic loggers at a variety of locations around the POG as part of PCIMP. WQ parameters monitored include turbidity (NTU), electrical conductivity (EC), dissolved oxygen (DO), phosphorus (K), acidity (pH) and temperature (oC). Details of these WQMP*s can be found within the QCLNG EIS/sEIS and the PCIMP website [Ref. 9] (www.pcimp.com.au).

Baseline Water Quality Monitoring

Baseline WQ monitoring undertaken prior to the commencement of dredging activities will include the collection of physical water quality data, via loggers, incorporating the following parameters; NTU, pH, DO, EC and oC. Baseline WQ monitoring data will be used in the day-to-day management of the dredging operations. Trigger levels based on the baseline data will be determined prior to the commencement of dredging operations.

http://www.pcimp.com.au/



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Sediment Plume Modelling Potential impacts on WQ and benthic primary producer habitat, including seagrass, corals and mangroves within the study area are caused by reduced light availability (light attenuation), increased sedimentation or actual smothering resulting from dredging activities or, in the case of mangroves, physical removal. Sediment plume modelling has been undertaken to predict the increases in total suspended solids (TSS) levels that are likely to occur as a result of the dredging and dredge spoil management activities. Results of the sediment plume modelling for Narrows Crossing dredging activities can be found in the EIS/sEIS. The summary below provides a context for the water quality management strategy (WQMS) set out in Section 6 of this document. Preliminary plume dispersion modelling [Ref.13] was conducted on the basis of a single pipeline option using a combination of backhoe dredging and jetting for an assumed spoil volume of approximately 168,000 m3 which included the Creek and Narrows Sections. Modelling on the revised spoil volumes has been assessed in the Narrows Crossing Dredge Plume Dispersion Modelling report (refer Appendix 4 for Executive Summary and Conclusion). The additional influence of the pipeline route dredging operation was found to be minimal (comparing Figure 40 and Figure 41) should the operation be undertaken using BHD. Note: Jetting is now not considered as an option in the proposed construction methodology due to liquefaction of high clay content soils. Narrows Crossing Dredge Plume Dispersion Modelling

Executive Summary

The study quantified and compared the potential total suspended sediment (TSS) concentrations, sedimentation rates and reduction in available light reaching the seafloor for each operation. Lastly, the modelling results for each scenario were combined with the predictions documented in GPC‘s Western Basin Dredging and Disposal EIS to take into account the general cumulative impacts from the three proposed LNG development associated dredge projects.

To simulate the transport, sinking, settlement and re-suspension of the dredged material, an advanced 3D sediment fate model (DREDGEMAP) was applied (sEIS used a 2D model). DREDGEMAP inputs included site-specific sediment composition, production rate of the equipment, mass flux, and initial vertical-distribution of sediments in the water column and details of the dredging. This approach provides a realistic estimate of the time spent and the volume of material suspended into the water column during dredging specifically related to the type of dredger employed.

The simulations of the CSD dredging operations indicated localised plumes of TSS would be concentrated at the bottom waters in comparison to concentrations toward the water surface. Horizontally, the plumes were predicted to be concentrated around the dredge footprint, with concentrations decreasing as a function of distance and current strength from the area of operation. During the out-going tide the sediment plume is advected (horizontal or vertical movement within water column) southwest from the pipeline trench towards Fisherman‘s Landing and onward to the southeast up to approximately 12 km from the dredging operation. At the turn of the tide, the plume is pushed back up the main channel towards the mouth of Graham Creek and the Narrows.

Re-suspension of the fine dredged sediment (< 130 μm) was a common occurrence due to the strong currents (up to 2 m/s) scouring the seabed within the estuary. Within the vicinity of the operational site, sediment up to 130 µm were predicted to be re-suspended approximately 50% of the time.

The predictions of the BHD dredging operations showed lower TSS concentrations when compared at the same time of the CSD operation. This would be attributed to the lower production rate of the BHD



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compared to the CSD. This however needs to be balanced against the shorter durations that can be achieved with the CSD, hence reducing the durations of having elevated TSS concentrations above ambient levels in Port Curtis. Note that the BHD induced TSS plume appears smaller when compared against that produced by the CSD, again due to the lower production rate, hence lower loss rate associated with the BHD. The BHD induced plume has a smaller peak loading in the water column, thus TSS levels falling below the 5 mg/L above ambient threshold occurred faster, hence limiting the size of the resultant TSS plume when compared against that produced by the CSD operation.

The modelling results for each alternative operation (CSD or BHD) were analysed to develop TSS concentration and sedimentation rate contour maps to identify:

• Impact Zone (s) – the area within the 50th percentile 25 mg/L TSS concentration and 200 g/m2/day sediment deposition rate contours;

• Management Area 1 – the area bounded by the 50th and 95th percentile 25 mg/L TSS concentration and 200 g/m2/day sediment deposition rate contours;

• Management Area 2 – the area outside 95th and 100th percentile 25 mg/L TSS concentration and 200 g/m2/day sediment deposition rate contours; and

• Non-impacted Area – areas beyond Management Area 2 where no impacts are predicted for biota as a results of physical.

The maximum predicted in-water concentrations for the CSD and BHD operations showed no areas identified as impact zones. Regions classified as Management Area 1 were predicted to occur at the western extent of the pipeline trench (adjacent to the coffer dam) to the middle of The Narrows channel and along the northeast shoreline of Kangaroo Island. Management Area 1 was only identified for the CSD operation. The modelling results, for both operations, showed Management Area 2 to occur within the Narrows, Graham Creek and south to Hamilton Point and Tide Island.

The sediment deposition rate modelling results for the CSD dredging operation revealed impact zones occurring from the northeast tip of the Western Basin to the entrance of Targinie Creek, at the entrance to Graham Creek and north to Worthington Island in the Narrows. Impact zones based on the BHD operation were predicted to occur at the entrance to Targinie Creek, north and south of Worthington Island. The modelling results for both operations showed Management Areas 2 and 1 to occur within the Narrows, Graham Creek and south to Hamilton Point and Tide Island. The main difference was that the BHD regions were quite sparse in comparison, again due to the lower production rate of this type of dredger.

The 50th percentile CSD modelling results showed a 1- 2% loss of light at the seabed between the entrance of Targinie Creek and northern extent of Western Basin. A reduction of 4 % was predicted in the immediate vicinity of the dredge operation and 6% along the eastern coastline of Kangaroo Island, coinciding with sediment re-dispersing during flood tide events.

The 50th percentile BHD dredge modelling results showed a 1- 2% reduction in light along the eastern shoreline of Kangaroo Island and north of the Western Basin reclamation site.

Conclusion- Predicted Cumulative Impacts

The CSD and BHD pipeline burial modelling results were combined with the predictions documented in Gladstone Port Corporation‘s Western Basin EIS, to provide a general understanding of cumulative impacts from the three LNG development dredge projects (Witt et al., 2009). Note as the model predictions from the EIS were not available, the contours presented in the images were traced.



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For comparison purposes, it is important to note that the previous modelling work undertaken by Witt et al., 2009 was limited to only depth averaged modelling for the current regime while the dredge modelling undertake herein, included 3D current profiles to better represent the water column dynamics within the region. The previous modelling also did not include the effects of waves or the effects of re-suspension on the particles. The modelling undertaken herein incorporated the actual time frames of the operations and utilized the geotechnical data to help better define the actual grain size distributions that will be encountered as the dredging operations proceeds across the Narrows. Consequently, the additional influence of the pipeline route dredging operation was found to be minimal (comparing Figure 4-3 and Figure 4-4) should the operation be undertaken using the Backhoe Dredger.

Figure 1: Map showing the 90

th percentile TSS concentrations by combining the predictions from the backhoe

pipeline dredge operation with the predictions for the three LNG development dredge projects as documented in Gladstone Port Corporation‘s Western Basin EIS.



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Figure 2: Map showing the 90

th percentile TSS plume concentrations from Witt et al., 2009 replotted to the color

key used here. These previous results show the predictions for the three LNG development dredge projects as documented in Gladstone Port Corporation‘s Western Basin EIS.

4.5 Marine Sediment Quality

The POG has a history of both dredging and dredged spoil disposal in both onshore and offshore sites [Ref. 14]. Dredge spoil originating from recent dredging campaigns has undergone sampling and analysis prior to dredging in order to ensure that it has been assessed as suitable for the proposed disposal method and location. The most recent dredging campaigns include:

Capital dredging of the Targinie Channel, Berth 2 and approach apron at Fisherman‘s Landing

Capital dredging of the Fourth Berth at RG Tanna Coal Terminal (2005)

Capital dredging of Berth 1 and approach apron at Fisherman‘s Landing (2008 and 2009)

Maintenance dredging of the shipping channels, swing basins and berths (annually in October / November), most recent sampling occurred in 2006

Maintenance dredging of the Gladstone Marina (2009).

Previous studies were undertaken in accordance with the National Ocean Disposal Guidelines for Dredge Material (NODGDM, Environment Australia 2002), which have recently been superseded by the National Assessment Guidelines for Dredging (NAGD 2009). Since the sediment quality guidelines in the NODGDM were generally more stringent or the same as those in the NAGD, the conclusions from earlier studies remain relevant. More recent marine sediment quality sampling and analysis of samples taken in within the Narrows Crossing dredging footprint did not exceed the NAGD [Ref. 15]. Specifically, sediment quality assessment work provided information on the predicted impacts of the dredging operations on the Narrows environment. This includes the following findings:



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Contaminants of Concern

Thirty-nine samples were analysed from nine cores. Most organic contaminants were not detected, and those that were (two polycyclic aromatic hydrocarbons and higher molecular weight TPH) were well below sediment quality Screening Levels;

Of the inorganic elements tested, arsenic was found to exceed the NAGD Screening Level / ISQG Low-Effects Level (20 mg/kg) in three samples taken from the same core. The maximum value was 23.7 mg/kg while the minimum was 20.8 mg/kg (mean value 21.8 mg/kg);

The 95% Upper Confidence Limits (UCLs) in the overall sediment, as well as within the Narrows Section only, and in the identified shallower and deeper intervals within them were well within the guideline. Overall, the UCLs over the entire depth were all below the Screening Level/ISQG Low-Effects Level of 20 mg/kg; and

According to the ANZECC/ARMCANZ (2000) Interim Sediment Quality Guidelines (Volume 1, Section 3.5), exceedance of a trigger value is acceptable if it is at, or below, the normal background concentration for a site. Previous reports of sediment assessments in the Port Curtis area have provided strong evidence that elevated levels of arsenic are products of natural weathering rather than anthropogenic sources.

Minor exceedances of the screening level (Interim Sediment Quality Guidelines Trigger Value) of 20 mg/kg for arsenic were noted in 3 samples of 39 total samples. On the basis of this information, dredged material from within the Narrows Crossing footprint could be considered uncontaminated and potentially suitable for reclamation or unconfined ocean disposal under the NAGD 2009.

Acid Sulfate Soils

Based on preliminary contaminant assessment results, QGC has concluded that ASS is not a major issue in the Narrows Section and that these sediments may be regarded as low risk to the marine environment if disturbed. Surface sediments within the terrestrial sections of the Narrows Crossing dredging footprint may potentially contain iron sulfate and/or pyrite and as such are considered PASS however management of this material is outside the scope of this DMP.

4.6 Marine Fauna

Cetaceans

The results of GPC‘s aerial and boat-based surveys, which covered an area from north of Curtis Island to south of Rodds Bay, are consistent with current literature that acknowledges the importance of Rodds Bay as a key habitat area for significant marine megafauna species. The Indo-Pacific Humpback dolphin has been found by recent surveys [Ref. 16] to be the most common coastal dolphin in the Port Curtis area with observed distribution from north of Curtis Island to south of Rodds Bay. The surveys identified a range of age classes using the region, suggesting that it is not only an important foraging area but an area important for calving of these marine mammals. No records were made of the Australian Snubfin dolphin.

Dugong

Dugongs are known to graze on seagrass within Port Curtis. In particular, seagrass in this area have been declared locally significant on the basis of dugong feeding behaviour. A survey conducted in November 2005 estimated there were 183 (± 66) dugongs in the Port of Gladstone area [Ref. 17] dugong feeding activity was observed on the majority of intertidal seagrass meadows surveyed during a study of benthic habitats in the port [Ref. 3].



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Turtles

The Green turtle (Chelonia mydas) Loggerhead turtle (Caretta caretta) and Flatback turtle (Natator depressus) are known to occur in Port Curtis, nesting occasionally on the beaches of Curtis Island and Facing Island. However, there are no known turtle-nesting beaches within close proximity (within 5 km) to the proposed QCLNG Project and therefore there are no direct impacts predicted to nesting habitat.

Green turtles have been regularly observed within local seagrass meadows, particularly those on Pelican Banks (eastern side of Curtis Island).

Leatherback turtles (Dermochelys coriacea), Hawksbill turtles (Eretmochelys imbricata) and Olive Ridley turtles (Lepidochelys olivacea) are not known to nest in the Port Curtis area. Individuals may migrate through the area, but significant numbers of them are unlikely in the Project area.

4.7 Introduced Marine Species

A baseline study and survey for introduced marine pests was been carried out at the Port of Gladstone by Gladstone‘s Centre for Environmental Management (Central Queensland University) and Tasmania‘s CSIRO Centre for Research on Marine Pests [Ref. 18]. The study‘s objective was to determine the presence of any of the ―target‖ or known marine pests. Samples were collected from over 20 sites within Glastone Harbour, including scrapings of marine organisms from piles, sediment cores for macrobenthos, dinoflagellates, plankton and dinoflagellate net samples.

Results revealed marine pests targeted by the Australian Ballast Water Management Advisory Committee are not in Gladstone Harbour. Ten introduced species were identified, however, none are considered to be a marine pest (i.e. they are not threatening endemic species, the natural ecology of the Harbour, fisheries or human health). The Authority continues to monitor marine pests at strategic sites.

4.8 Terrestrial Fauna and Flora

Studies [Ref.19] into the terrestrial fauna and flora in the study area indicate that the alignment and reclamation area that will be affected by dredging are generally marine habitats with saline mudflats that are fringed with margins of mangroves. Hence terrestrial fauna is not discussed further.

4.9 Shorebirds

Migratory shorebirds are known to forage in the mudflats through which the Narrows Crossing Pipeline will travel (refer QCLNG EIS/sEIS). As the dredging will predominantly occur in water the impact on these shorebirds due to dredging in the Narrows Section is expected to be negligible. Dredging equipment is slow moving or stationary so as the water level drops after a high tide it is expected that those species or individuals more sensitive to noise or movement will avoid getting too close to the dredging operations. At high tides distances from roosting sites at Friend Point and Laird Point should also mean that potential for disturbance to roosting shorebirds is minimised to negligible levels.



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5.0 PREDICTED ENVIRONMENTAL RISKS

The potential environmental impacts associated with the dredging and material disposal for the QCLNG Project have been assessed as part of the EIS process. The environmental risks associated with dredging of in the Narrows Section of the Narrows Crossing Pipeline are:

Deterioration of water and sediment quality leading to stress and/or loss to areas of seagrass and soft coral in the vicinity of the dredging activities.

Interactions between construction vessels and marine fauna, specifically turtles and marine mammals.

Accidental introduction of marine pest species from vessel hulls and ballast water.

Disturbance to, and potential contamination from, acid sulfate soils.

5.1 Sediment and Water Quality

Sediment Quality (contaminants) in the Narrows has been described as near pristine by PCIMP so disturbance of sediments should not result in release of metals or poly-aromatic hydrocarbons (PAHs) to the environment [Ref. 9]. The primary consideration in management of dredging is release of the sediments to the water column and associated impacts.

The existing water quality in the Narrows (and Grahams Creek) has been ranked equal to the comparable PCIMP reference sites [Ref. 9].

Detailed 3D sediment plume modelling has been carried out to predict the trajectory and fate of sediments released from the seabed during dredging operations. This modelling has been used to predict the distribution of total suspended solid concentrations and the rate of sedimentation. For both of these parameters, preliminary contour plots are presented showing the 50th and 95th percentile contours. (Refer QCLNG Narrows Crossing Sediment Plume Modelling report)

For modelled scenarios, the 95th percentile maps show isolated areas of increased turbidity (displayed as suspended sediment concentrations) above the 25 mg/L threshold. These areas are largely concentrated directly adjacent to the dredging activities, with some isolated areas at Friend Point and the eastern side of the Narrows toward Targinie Creek [Ref. 13].

5.2 Fauna Interaction

This potential impact category refers to either direct or indirect effects on marine fauna within the study area, either due to dredging operations and vessel movements (direct impact) or due to accidental spills of hydrocarbons, chemicals or sewage during the dredging and spoil disposal operations (indirect impacts).

The likelihood of interactions between vessels used for dredging of the Narrows Crossing and marine fauna is considered low. The protocols outlined in Section 6.3 and Section 6.4 will be implemented to further reduce the potential for collisions with marine fauna.

5.3 Introduced Marine Species

This potential impact category consists of introduction of non-indigenous marine species to the study area through dredging and /or support vessel hulls (biofouling) or through discharge of contaminated ballast water to the local marine environment.

Dredges and associated vessels are in the highest risk category as vectors for introduced marine pests [Ref. 20]. As such, management strategies to minimise the potential for introduction of non-native species are included in this DMP (Section 6.5).



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5.4 Acid Sulfate Soils

Where positive potential acid sulfate soils (PASS) deposits have been identified they are limited in volume, and well defined in both the vertical and horizontal plane. Cores taken within the marine areas of the Narrows Section indicate that, in these areas, there is below trigger low level (<0.3S%) and an inherent capability to balance any spot occurrences of latent acid potential with an overwhelming excess acid neutralising capacity (ANC).

Other potential environmental impacts not specifically addressed in this DMP, such as waste management, hydrocarbons, chemicals, noise and light, will be managed under the broader QCLNG Project EMP in the EA application.



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6.0 QCLNG NARROWS CROSSING MANAGEMENT STRATEGIES

6.1 Overview

This DMP provides the basis for managing potential impacts relating to dredging and spoil disposal activities. Four key management strategies have been developed to manage potential impacts of dredging. Each strategy includes a tiered approach to impact management. Management strategies are:

Management Strategy 1 – Water Quality

Management Strategy 2 – Marine Mammals Interaction

Management Strategy 3 – Marine Turtles Interaction

Management Strategy 4 – Introduced Marine Pests

Other potential environmental impacts that fall outside the DMP implementation requirements shall be managed under the broader QCLNG Project EMP that forms part of the EA application. This includes the management of waste, hydrocarbons, chemicals, noise and lighting etc.

6.2 Environmental Management Plan

The dredging Contractor will be required to prepare and implement a construction EMP (CEMP) for dredging activities.

6.3 Management Strategy 1 – Water Quality

This DMP has adopted a best practice management approach to the impacts of large-scale dredging programs. This approach defines tiered impact zones, within which management and monitoring activities are pre-defined. Impact zones are defined in terms of direct and indirect effects, permanent and temporary effects, physical versus biological effects, and mortality versus sub-lethal effects [Ref. 21 and 22]. The following zones have been specified for management of seagrass and corals during dredging. Management zones defined by sediment deposition rates will only be applied to the water quality monitoring site (Figure 6-1). This approach has been adopted as a second level of protection for isolated soft coral populations that occur in the vicinity of.

Impact Zone

This zone represents the area within which mitigation and management strategies have been applied in the project design, planning and operational phases, to reduce the size and severity of impacts to the greatest extent reasonably practical. Impact areas are often treated as ‗‗mixing zones‘ consistent with the approach adopted within the Australia and New Zealand Environment and Conservation Council (ANZECC) water quality guidelines known as the Australian WQ Guidelines (AWQGs). It is acknowledged (via the EIS and subsequent permitting processes) that – even after optimisation, mitigation and management – there will still be impacts to biota within the impact zone. This may include direct impacts, such as those within the dredging footprint, which are usually permanent. It is also likely to include indirect impacts (such as those caused by loss of light and by sedimentation), which may only be temporary. In the case of seagrass and corals, regrowth is usually expected to occur within several years, assuming that the substrate is not damaged, and that water quality returns to normal after the impact period.

The QCLNG Project has defined an impact zone within which mortality is expected. Predictions made for this impact zone have used an expert working group approach (as documented in Volume 6, Section 2.4 of the EIS). For dredging of the Narrows Section, the outer boundary of the impact zone coincides with the modelled 50th percentile 25 mg/L SSC contour (Figure 6-1). For the water quality



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monitoring site at {insert monitoring location} only, a second Impact Zone based on the 50th percentile 200 g/m2/day sediment deposition rate contour will also be defined. This is to allow greater protection of isolated soft coral populations within the vicinity of this site.

Management Area 1

This represents the zone where impacts to biota are expected, but where appropriate management during dredging operations is expected to limit these to sub-lethal impacts only, and where rapid recovery is expected following completion of dredging. For dredging of the Narrows Section, this area is bounded by the 50th percentile 25 mg/L SSC contour and the 95th percentile 25mg/L SSC contour (Figure 6-1). It is within this area that most management and monitoring will be directed.

For the water quality monitoring site at {insert monitoring location} only, a second Management Area 1 will be defined as the area between the 50th percentile 200 g/m2/day and 95th percentile 200 g/m2/day sediment deposition rate contour. As for the second impact zone, this is to allow greater protection of isolated soft coral populations within the vicinity of this site.

Management Area 2

Management Area 2 is the zone within which measurable physical effects (such as turbid plumes) may occur, but where no effects to biota were predicted. Monitoring sites will be established within Management Area 2, but these are intended to serve as comparator sites for detecting impacts within Management Area 1. For dredging of the Narrows Section, this area exists outside the 95th percentile 25 mg/L SSC contour (Figure 6-1).

For the water quality monitoring program at {insert monitoring location} only, a second Management Area 2 will be defined to include the area outside the 95th percentile 200 g/m2/day sediment deposition contour. This is to allow greater protection of isolated soft coral populations within the vicinity of this site.

Non-impacted Area

Areas beyond Management Area 2 are those where no impacts are predicted for biota due to physical conditions such as turbidity and sedimentation. Monitoring sites within this area will serve as reference sites and will be placed sufficiently close to Management Area 2 to confirm there are no differences between naturally occurring changes inside and outside of these areas.

Predicted Impacts

Impacts to seagrass and corals due to the Narrows Section dredging are predicted to be minor, but may occur due to altered water quality (including increased turbidity and sedimentation) (Section 5). A summary of potential predicted impacts to seagrass and corals include:

There are no predicted indirect impacts to seagrass as a result of dredging for the Narrows Section. This represents the area of seagrass within the defined Impact zone, that will be exposed to depth averaged TSS concentrations greater than 25 mg/L (including forecast ambient TSS) for 50 percent of the time or more (i.e. 50th percentile).

Approximately 3 ha of seagrass may be impacted by the dredging activities. This represents an area of seagrass within the defined Management Area 1.

Management Area 1 is where the greatest dredge management effort will be directed. Corals (hard and soft) are more susceptible to sedimentation than seagrass, with ecological effects noted for deposition rates above 200 g/m2/day.



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A dual approach to management of potential impacts to seagrass and corals will be implemented comprising preventative, and contingency and responsive management measures.

Figure 6-1 - Narrows Section Water Quality Management Areas

Management of Impacts to Water Quality

Environmental Objective:

To minimise adverse effects on water quality that may lead to losses of seagrass and corals

Key Performance Indicators:

Monitored water quality parameters

The number of exceedances of trigger levels at ‗Management Area 1‘ monitoring sites

Management: General Management Strategies

Accurate bathymetric survey will be carried out of the dredging areas

Differential GPS (DGPS) will be used on dredges to ensure direct impact is restricted to the approved dredging and disposal / reclamation areas.

Preventative Measures:

Dredging and Offshore Spoil Disposal:

Hopper door seals will be maintained in good condition to ensure minimum loss of sediment during transport.

Sailing routes will be selected to minimise the generation of propeller wash.

Well maintained and properly calibrated dredging vessels will be used. Vessels will include features such as real-time bathymetric charts, production statistics and vessel positioning systems.

Reclamation:

The design and operation of the reclamation area (including internal bund walls) will be used to reduce TSS being discharged into the marine environment.

A suitable control (e.g. weir box) will be used at the discharge point to control the water level and the rate and timing of discharge.



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Pipeline:

Well maintained pipelines will be used to minimise leakage of turbid water during pumping of material to the reclamation area.

Pipeline flow controls and inline monitoring will be utilised.

Regular observation and inspection of pipelines will be undertaken.

Any observed or detected leaks will be repaired as soon as practicable.

Pumping will stop as soon as any major ruptures are identified (within the operational constraints of the equipment).

Responsive Measures:

Reclamation:

Water quality monitoring sites will be established at the discharge location from the Fisherman‘s Landing reclamation area. Breaches of water quality will in the first instance be investigated to determine whether the discharge from the reclamation area was responsible (wholly or in part) for observed exceedances. Tailwater from the Fisherman‘s Landing reclamation area will be monitored inside the discharge outlet logged hourly for turbidity and pH. TSS will be monitored weekly. The table below outlines the parameters to be measured and their respective trigger values.

Monitoring Point Parameter Minimum Maximum Frequency

Discharge Point Weir Box Cell 2FL

TSS --- 100 mg/l Weekly

Discharge Point Weir Box Cell 2FL

Turbidity --- --- Hourly

Discharge Point FL pH 6.5 9 Hourly

Discharge Point FL Metals and Ammonia

As per approval

conditions

As per approval

conditions

Monthly or if pH is outside trigger limits

Management responses for exceedances of discharge trigger levels for the Fisherman‘s Landing reclamation areas may include:

Raising weir levels (final weir and others if required).

Cease discharging from polishing pond until water clarity improves.

Cease discharging from Cell 2 until water clarity improves.

Reduce dredger delivery rate.

Water Quality Triggers and Management Responses

Six water quality sites will be established to monitor predicted impacts to water quality resulting from dredging of the Narrows Section. These will include four sensitive locations and two reference sites (Section 7).

Management Response Level

Trigger Value: Turbidity Trigger Value: Sedimentation*

No Exceedance NTU < 18 <200 g/m2/day



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Level 1 10 day rolling average of NTU > 18 and less than 24

>200 and less than 400 g/m2/day

Level 2 10 day rolling average of NTU > 24

> 400 g/m2/day

*Sedimentation trigger values only relate to the water quality monitoring site at .

Breaches of water quality triggers will, in the first instance, be investigated to determine whether the dredging and spoil disposal activities were responsible (wholly or in part) for observed exceedances.

Investigations of possible causes will examine:

Whether any similar trends were observed at reference sites.

The location of the dredging and spoil disposal activities in relation to the affected site(s).

The extent and position of the visible dredge plume in relation to the affected site(s).

The weather conditions, sea state and tides at the time of the exceedance.

The spatial distribution of affected sites in relation to unaffected sites and the position of the dredge.

The investigation will be presented to the QGC and relevant parties to allow a decision to be made with respect to the potential role of the dredging and spoil disposal program in the observed exceedance(s) and whether the activities continue to pose a threat to further or continued exceedances.

In the event that it is considered that dredging or spoil disposal has contributed to the exceedance, the following management and monitoring strategies will be implemented, related to each level of exceedance and response:

Level 1 Management Response:

Report the exceedance and results of investigation in weekly QGC reporting.

QGC to consider the report and outcomes of investigation and develop management strategies as necessary to manage the effects on water quality.

Continue monitoring water quality.

Level 2 Management Response:

Immediately report exceedance and results of investigation to the QGC.

QGC to convene a meeting with relevant parties as soon as practicable to consider the report and implement appropriate management strategies for the protection of water quality.

QGC to inform regulatory authority of the exceedance and proposed management response within 24 hours of detection.

Continue monitoring water quality.

Management strategies may include:

Decreasing the average rate of dredging to reduce the amount of turbidity into the water column.

Assess the material being dredged and, where practicable, relocate the dredge head to dredge coarser material, which will allow finer sediments to settle out of the dredge plume. Finer material may only be dredged again when turbidity levels at sensitive locations have returned to below trigger values.



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Monitoring: Bathymetric surveys will be carried out within dredging and disposal areas upon completion of dredging and disposal programs as per Sea Dumping Permit (SDP) requirements; and

Water quality monitoring program (Section 6.2).

Reporting Requirements:

Water quality reports (Section 8).

Regulatory reporting (Section 8).



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Figure 6-1 - Narrows Section Water Quality Management Areas



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6.4 Management Strategy 2 – Marine Mammals Interaction

The interaction between marine mammals (cetaceans and dugongs) with dredging equipment has the potential to cause injury or mortality to individual animals via direct striking or entrapment/entrainment. Refer to Section 4 for details on the marine mammals present in the project area.

Marine Mammal Management


To detect and avoid risks of injury/mortality to marine mammals as a result of the dredging and spoil management activities.

Key Performance Indicator:

Zero reported incidents of injury or mortality to marine mammals as a result of dredging and spoil management activities.

Management: Preventative Measures:

The requirements for cetacean interactions specified under Part 8 of the EPBC Regulations 2000 (Cth.) and the Australian National Guidelines for Whale and Dolphin Watching will be complied with.

Vessel speed limits will be applied to vessels operating within the construction area to reduce the risk of vessel strikes on marine mammals.

During barge transportation of dredged material, a lookout for marine mammals will be maintained as per the requirements for cetacean interactions specified under Part 8 of the EPBC Regulations 2000 (Cth.). In the event that a marine mammal is sighted, the vessel speed and direction will be altered as necessary to avoid impact with the marine mammal (within safety constraints). [Note: relevant only if offshore disposal is contemplated]

Where practicable, barges will use consistent routes during offshore disposal.

Adopt ‗slow start‘ procedure for dredges to alert marine mammals and potentially deter them before the cutter head is started.


Weekly summary of marine mammal sightings will be presented to the QGC.

Where marine mammals are identified within the vicinity of dredging works specified Safety Zone (within 150 m for species of conservation significance), operations will be temporarily moved or suspended to avoid contact.

The contractor will employ an appropriately trained spotter to ensure no marine species of conservation significance come within the relevant Safety Zones.

For dredge vessel activity undertaken outside of dredging operations, the vessel will comply with the following:

o If a marine mammal approaches the vessel or comes within the 100 m avoidance area, the vessel will not change course or speed suddenly.

o If a calf appears within 300 m of the vessel, the vessel will take the appropriate action to withdraw from this distance at a constant slow speed.

o These measures will be implemented where it is safe and practicable to do so, relative to vessel manoeuvrability, vessel draft considerations and other vessel activity within the port.

In the event that the dredging or spoil disposal activities result in injury or mortality to one or more marine mammals, a review of the current management measures will be undertaken in consultation with a marine mammal specialist to identify potential additional management measures and outcomes presented to QGC.

QGC will convene a meeting with relevant parties as soon as practicable to consider the report and implement appropriate management strategies for protection of marine mammals.



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Note 1: There is not considered to be a significant risk of impacts to marine mammals as a result of the deterioration in water quality (elevated turbidity). Potential impacts of increase turbidity on marine mammals will be managed via the water quality management measures presented in Section 6.2.

Note 2: In line with recent practice in the management of impacts to marine mammals on large scale dredging project in Australia, the above management measure will not apply to dolphin sightings.

Monitoring: Not applicable

Reporting: Immediately report any marine mammal injuries to DERM Hotline on 1 300 130 372 and provide information on location, what the animal is and the animal‘s state (alive or deceased).

All incidents resulting in marine mammal injury or mortality will be reported to DERM and DEWHA.

All marine mammal sightings resulting in the application of management measures will be recorded.



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6.5 Management Strategy 3 – Marine Turtles Interaction

The interaction between a marine turtle and the dredging equipment has the potential to cause injury or mortality to individual animals via direct striking or entrapment/entrainment. Refer to Section 4 for details on the marine turtles present in the project area.

Marine Turtle Management


To detect and mitigate risks of injury/mortality to marine turtles as a result of the dredging and spoil management activities.

Key Performance Indicator:

Zero reported incidents of injury or mortality to marine turtles as a result of dredging and spoil management activities.

Management: Preventative Measures:

Vessel speed limits will be applied to vessels operating within the construction area to reduce the risk of vessel strikes on marine mammals.

Adopt ‗slow start‘ procedure for dredges to alert turtles and potentially deter them before the dredging activities are started.

In the event that the dredging or spoil disposal activities result in injury or mortality to two or more marine turtles, a review of the current management measures will be undertaken in consultation with a marine turtle specialist to identify potential additional management measures.

Lighting onboard dredging and support vessels will be limited to a level required for safe and efficient operations.


Weekly summary of turtle sightings will be presented to QGC

In the event that the dredging or spoil disposal activities result in injury or mortality to one or more turtles an investigation will be conducted to identify potential additional management measures and outcomes of this investigation will be presented to the QGC and relevant parties as required. QGC will consider the report and implement appropriate management strategies for protection of turtles.

Note 1: There is not considered to be a significant risk of impacts to marine turtles as a result of the deterioration in water quality (elevated turbidity). Potential impacts of increase turbidity on marine turtles will be managed via the water quality management measures presented in Section 6.2.

Monitoring: Not applicable

Reporting: Immediately report any marine mammal injuries to DERM Hotline on 1 300 130 372 and provide information on location, what the animal is and the animal‘s state (alive or deceased).

All incidents resulting in marine turtle injury or mortality will be reported to DERM and DEWHA

All marine turtle sightings resulting in the application of management measures will be recorded.



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6.6 Management Strategy 4 – Introduced Marine Species

Introduced Marine Pest Species Management


To prevent the establishment of Introduced Marine Species into the waters surrounding the project area as a result of the dredging and spoil disposal activities.

KPI Zero establishment of introduced marine species as a result of the dredging and spoil disposal activities.

Management: Vessels Mobilising From Within Bioregion Encompassing Port Curtis

No specific management measure required.

Vessels Mobilising from within Australia but outside of Bioregion Encompassing Port Curtis

All dredging vessels and dredging support vessels (e.g. barges) to be subjected to vessel risk assessment (prior to mobilisation) based on vessel history, last cleaning, last application of anti-fouling and vessel location.

Dredging vessels determined to be low risk, can be mobilised to site (direct sail/tow) and begin operations.

Vessels determined to be medium to high risk, require a pre-mobilisation inspection with full cleaning prior to mobilisation to site in the event that marine species listed on the priority species of concern list are found.

Once classified as clean, vessel to undertake direct sail/tow to site.

Vessels Mobilising from outside of Australian Waters (AQIS mandatory requirements)

All dredging vessels and dredging support vessels (e.g. barges) to be subjected to vessel risk assessment (prior to mobilisation) based on vessel history, last cleaning, last application of anti-fouling and vessel location.

Dredging vessels require a pre-mobilisation inspection with full cleaning prior to mobilisation in the event that marine species listed on the priority list are found.

Once classified as clean, vessel to undertake direct sail/tow to site.

A pre-start vessel inspection to be undertaken within 48 hours of arrival on site

Introduced Marine Species Response Measures

In the event that marine species on the ―priority species of concern‖ list, are identified on dredging vessels while at the project site, the following measures will be taken:

The relevant regulatory authorities will be notified immediately

An introduced marine species monitoring and response program will be developed in conjunction with the regulatory authorities. The aim of this program will be to detect and control the establishment of any introduced marine species.

Monitoring: Introduced marine species monitoring and response program

Reporting: The results of all vessel inspection will be provided to the relevant regulatory authorities within 72 hours of the inspection.

Reporting requirements relating to the introduced marine species monitoring and response program will be developed in the event that the plan is required.



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7.0 MONITORING AND INSPECTION

7.1 Overview

Potential impacts of elevated turbidity and sedimentation from dredging for the Narrows Section (Section 3) will be managed to remain within pre-determined ―threshold levels‖. The threshold levels represent the levels above which there is considered to be a significant risk to sensitive biota.

The development of tolerance thresholds was based on the following:

Analysis of baseline data on sensitive biota in the area (depth, distribution, percent cover, species, diversity, spatial extent)

Analysis of baseline data on water quality parameters of relevance (turbidity, light climate, light attenuation, sedimentation, temperature)

Analysis of relevant literature on relationships between the health of sensitive biota and water quality parameters

Development of relationships between water quality parameters and sensitive biota in Port Curtis.

7.2 Water Quality Monitoring Program

The objective of the WQMP* is to ensure that any potential impacts that may lead to adverse effects on sensitive biota are avoided or minimised.

The monitoring program will monitor sensitive values and provide an early warning of the potential risk of impacts due to dredging. This reactive monitoring approach is characterised by the frequency of data collection and review and will provide time to mitigate potential impacts in the event they arise.

The monitoring and inspection programs that will be undertaken to support the management strategies are detailed in the following sections. The programs and surveys to be implemented include:

Water quality monitoring

Invasive marine pest surveys.

The WQMP* dredging activities will combine nephelometers, continually recording chemical parameters, weekly sampling for water chemistry, light, total suspended solids and depth profiled physical and chemical parameters.

Monitoring sites will be established at locations; four defined as sensitive locations and two as reference sites. Existing PCIMP sites will be used as reference sites. Sensitive locations are located as close as possible (balanced against logistic constraints and to leverage off the long-term PCIMP dataset) to existing seagrass meadows (or other sensitive environments) where modelling predicted that impacts may occur (Figure 7-1). Coordinates for monitoring locations are provided in Table 7-1.



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Figure 7-1 - Narrows Section Water Quality Monitoring Locations

At each location a Multiprobe Nephelometer will be deployed, mounted on a special marker (DERM/DEEDI-DPIF Approved), such that they are suspended in the water column at approximately 1.5 m from the surface. These units will continuously measure temperature, conductivity, dissolved oxygen, pH, and turbidity. In addition, a PAR Sensor (LI-COR LI192SQ Underwater Quantum Sensor) will also be mounted on the buoy to continually record light intensity at the surface. All parameters will be recorded at 15 minute intervals and a telemetry unit will transmit data to a secure site every hour. Loggers will be calibrated during weekly monitoring .

Data will be statistically analysed to remove erroneous data points before being exported to a database to calculate a 10 day rolling median of turbidity (NTU). Data recorded from impacts sites will be adjusted to account for background recordings at the reference sites. These adjusted rolling NTU averages will be used to assess exceedances of trigger values (Section 7.3). Following an exceedance which has invoked a management response, management strategies will not be lifted before a consistent downward trend in the 10 day rolling average has been observed.

Weekly monitoring will also be conducted at the same locations. Measurements for weekly monitoring will include:

1) Depth profiling of water chemistry parameters: Water chemistry will be recorded using a YSI6820 multi-parameter water meter. Parameters will be measured at all sites at 0.5 m intervals to the benthic surface.

2) Sedimentation: Sediment traps will be deployed at all monitoring locations to measure gross sedimentation rates. Traps will be suspended approximately 3 m below the surface. Note: This data will only used for management purposes at {insert monitoring location}, as per information provided in Section 6.



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Table 7-2 - Summary of Narrows Section Baseline Water Quality Monitoring Program

Analysis Parameters Frequency

Physico- chemistry

Nephelometer

(temperature, conductivity, DO, pH, turbidity, ORP)

Continual logging at 15 minute intervals; telemetered data transmitted hourly.

Depth profiling

(temperature, conductivity, DO, pH, turbidity, ORP)

Weekly

Water Analysis

Total Suspended Solids (TSS) Weekly

Gross sedimentation rates {insert monitoring location} only

Weekly

7.3 Invasive Marine Pest Management and Monitoring

Vessel Inspections

An introduction of Introduced Marine Pest Species (IMPS) could, in the worst case, lead to irreversible impacts to the composition and function of the ecosystem through competition, predation, or habitat modification.

The key vectors for IMPS on dredger vessels and associated immersible equipment requiring management attention include:

Biofouling on vessel hulls and other external niches (such as propulsion units, steering gear and thruster tunnels)

Biofouling of vessels‘ internal niches (such as sea chests, strainers, seawater pipe work, anchor cable lockers and bilge spaces)

Biofouling on equipment that routinely becomes immersed in water (including but not limited to dredging equipment, cutters, ladders, and deck mounted tender vessels)

Discharge of high risk ballast water.

A detailed risk assessment procedure has been developed to assess the likelihood of a particular contracted vessel and/or immersible equipment being infected by IMPS prior to undertaking dredging and spoil disposal activities within the proposed project area.

The objective of the risk assessment is to identify the inherent level of IMPS threat a contracted vessel or its immersible equipment poses. This will allow the dredging contractor to select the most appropriate vessels and immersible equipment and establish management measures to mitigate the identified threats to an acceptable low level.

The three risk categories are:

LOW – low likelihood of IMPS (no additional management measures required)

UNCERTAIN – likelihood of IMPS is not apparent (precautionary approach adopted, additional management measures required)

HIGH – identified as a potential risk (additional management measures required).

The key risk assessment factors to be considered include:



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Vessel type

Inspection history

Internal treatment/inspection history

Vessel desiccation period during mobilisation

Presence and age of fouling control coating

Presence or absence of internal treatment systems

Climatic region of operation

Stationary or slow periods of operation and climatic region

Type of vessel activity

Adherence to AQIS ballast water requirements.

It should be noted that where there is no intention to operate the vessels and/or immersible equipment within the project area or the vessel and immersible equipment has been sourced locally then there is no requirement to proceed with this risk assessment procedure.

Where IMPS inspection is established as the most appropriate course of action, a systematic out-of-water or in-water inspection of the vessel and/or immersible equipment should be undertaken, to specifically inspect for sediment or biofouling containing IMPS of concern.

The inspection should be undertaken within seven days of the final vessel departure for the project area.

A suitably qualified marine scientist with experience in biofouling inspections will lead all IMPS inspections. In-water inspections must be conducted in water with adequate visibility (as determined by Lead IMPS Inspector). The method for in-water inspections is at the discretion of the Lead IMPS Inspector and may include, but is not limited to:

The Lead IMPS Inspector undertaking physical inspection

The Lead IMPS Inspector remotely directing divers to undertake the inspection using live audio and visual communications.

Systematic inspections of the external and internal vessel areas will determine:

Presence, extent and condition of the fouling control coating (FCC) (external areas)

Presence and condition of internal fouling control systems

Presence of sediment

Extent of biofouling

Presence of IMPS of concern.

External hull inspections will include:

Vessel hull

All external niche areas (i.e. anodes, propellers, thrusters, sea chests).

Internal vessel inspections will include:



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Deck area and associated equipment (e.g. deck-borne tenders)

Bilge spaces

Anchor cable lockers

Internal seawater cooling systems, to include strainers and strainer boxes.

Where possible, video and/or still images will be taken of all key areas (including external and internal niche areas) of the vessel.

At the completion of the vessel inspection, the Vessel and Immersible Equipment Checklist and Inspection Form must be completed, signed by the Lead IMPS Inspector and faxed/emailed to the Narrows Pipeline Environmental Officer ASAP within 24 hours of completing the inspection.

In-water inspections may need to be followed by an out-of-water inspection or other management measures, where the in-water inspection detects high levels of secondary or tertiary biofouling. This will be necessary where an in-water inspection cannot confirm to a satisfactory level of confidence the absence of IMPS. This requirement will be determined by the Lead IMPS Inspector.

The ballast water logs will also be inspected to confirm compliance with the AQIS Mandatory Ballast Water Requirements.

In the event that sediment or known/suspected IMPS are identified, a photograph or video image showing the species will be taken and a sample will be taken and sent for expert taxonomic identification (if found on vessels within Australian waters). It should be noted, however, that the management strategy presented above will apply when suspected marine pest are identified and implementation of the strategy will not depend on the taxonomic identification due to the time required for such a study.

At the conclusion of the vessel and immersible equipment risk assessment process, cleaning, treatment and re-inspection requirements, relevant documentation (copies of completed assessment sheets, inspection forms etc.) will be compiled and submitted to the DEEDI, AQIS and GBRMPA.

Documentation may include:

Vessel history (including FCC certification and cleaning/maintenance history documentation)

A copy of the completed Risk Assessment Scoring Sheet for each vessel and immersible equipment item

A copy of the completed Vessel and Immersible Equipment Inspection Checklist and Inspection Form signed by the Lead IMPS Inspector

A copy of the final IMPS inspection report (including photographs)

Correspondence detailing actions undertaken following the initial risk assessment.

7.4 Monitoring Schedule

The monitoring activities will occur as follows:

1. Pre-dredging

a. Water quality monitoring will commence at least 10 days prior to commencement of dredging operations.

b. Invasive Marine Species monitoring will occur prior to the commencement of dredging.

2. During Dredging

a. Continual logging as well as weekly water quality monitoring at impact and reference sites.

3. Post Dredging and Disposal



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a. In the event that results of monitoring activities indicate impacts are greater than were predicted, undertake further surveying at relevant impact and reference sites within 12 months of completion. The need for further monitoring past this point will be determined in conjunction with the appropriate regulatory authorities.



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8.0 REPORTING

8.1 General Reporting

Weekly reporting amongst dredging works contractor and QGC, including:

Status of dredging operations

Progress of water quality monitoring

Any Level 1 exceedances incurred and actions implemented.

Liaison between the Narrows Section dredging works and greater Narrows Crossing works programme will be coordinated as required.

A monthly monitoring report will be prepared by QGC and provided to DERM throughout the period that dredge operations are undertaken. This report shall include:

Results of the monitoring

An evaluation or explanation of the data from this monitoring program

Details of any turtle or marine fauna sightings

Details of any complaints received, including investigations undertaken, conclusions formed and action(s) taken

A summary of environmentally significant equipment failures or events

An outline of corrective actions taken or proposed to reduce environmental harm.

8.2 Exceedance Reporting

Following an incident where the environmental trigger value has been breached for a longer duration or greater frequency, an environmental exceedance form will be completed. Following the completion of an environmental trigger incident form, the following actions should be undertaken:

The nature of the event will be investigated

Advice may be sought from a specialist

Monitoring results will be reviewed and additional monitoring may be undertaken if required

The effectiveness or need for new/additional contingency measures will be reviewed

Strategies will be identified to prevent reoccurrence

Environmental documentation will be reviewed and revised as necessary

If the environmental non-compliance is significant in nature it will be reported by QGC to DERM as required under the EP Act and the approval conditions.

If the water quality parameters for either turbidity or sedimentation rates are observed to be above the Level 2 Management Trigger then an exception report will be provided by QGC to DERM within 24 hours of detection. The report must contain:

The date, time and location at which the monitoring was undertaken

The suspected cause of the exceedance

Actions taken to prevent further exceedances.



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The Level 2 Water Quality Management Trigger values are:

Turbidity: 10 Day rolling average turbidity is greater than 24 NTU. 24 NTU is considered equivalent to a SSC of 40 mg/L at impact sites within Management Area 1.

Sedimentation: Sedimentation rate is greater than 400 g/m2/day dry weight at {insert NC sedimentation site(s)} only within Management Area 1.

In the event that the dredging or spoil disposal activities result in injury or mortality to one or more marine mammals or marine turtles advice of the incident will be provided by QGC to DERM immediately on 1300 130 372 and to DEWHA within 1 day of detection. As soon as practicable after the initial advice DERM and DEWHA will be provided with details of the incident including:

The date, time and location at which the incident occurred

Biological details of the fauna (such as species, size and estimated age)

The suspected cause of the incidence

Actions taken to prevent further exceedances.

8.3 Final Reporting

A report from a Registered Professional Engineer of Queensland commissioned by QGC will be submitted to DERM within three months of completion of works, certifying that the works (including any other associated works) have been constructed in accordance with the approved drawings and these conditions.

8.4 Contingency Plan

The contingency monitoring program is outlined in Section 7.2. The dredging contractor will be required to contact QGC‘s Narrows Pipeline Environmental Officer if turbidity exceeds the discharge trigger values. The dredging contractor will implement the monitoring and management responses as outlined in Section 7.2.



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REFERENCES

Ref. No. Document / Report

1 Coordinator Generals Report. Queensland Curtis Island LNG Project. June 2010. Queensland State Government - DERM

2 DERM Guideline - Coastal Development. Approval of a Dredge Management Plan document. http://www.derm.qld.gov.au/register/p00935aa.pdf

3 Rasheed MA, Thomas R, Roelofs AJ, Neil KM and Kerville SP (2003). Port Curtis and Rodds Bay seagrass and benthic macro-invertebrate community baseline survey, November/December 2002. Q103058 (DPI Carins).

4 Queensland State Government. Coastal Regulation Information Sheet. http://www.derm.qld.gov.au/register/p00933aa.pdf

5 The QCLNG Project EIS and sEIS reports can be accessed via the project website www.qclng.com.au (specific URL is http://qclng.com.au/eis/draft-eis/)

6 Coordinator-Generals Report. Western Basin Dredging and Disposal Project. Gladstone Port Corporation, July 2010.

7 Connell Wagner Pty. Ltd., ―Geotechnical Investigation and Analysis Report, Curtis Island Road / Bridge Concept Design‖ for the Department of the Coordinator General, December 2008.

8 QCLNG Project, Narrows Crossing – Ranges of Measured and Estimated Geotechnical Engineering Parameters, Advanced Geomechanics Pty. Ltd, Doc. No. 319-001-003.

9 Storey AW, Andersen LE, Lynas J, Melville F (2007) Port Curtis Ecosystem Health Report Card

10 Alquezar R, Small K, Hendry R (2007) Port Curtis Biomonitoring Programme: macroinvertebrate, mangrove and seagrass surveys November 2006. A report to Queensland Energy Resource Limited (QERL). Centre for Environmental Management, Central Queensland University, Gladstone, Queensland.

11 BMT WBM 2009 Port Curtis Reef Assessment.

12 n/a

13 QCLNG Pipeline Burial Sediment Plume Modelling, Asia-Pacific ASA, Draft 1, December 2009.

14 Port of Gladstone, Western Basin Dredging and Disposal Environmental Impact Statement, November 2009.

15 QCLNG Upstream Pipeline Route – Gladstone Harbour, Queensland, Sediment Quality Assessment Report, GeoCoastal (Australia) Pty. Ltd. December 2009

16 GPC Western Basin Dredging Project – Draft EIS



http://www.qclng.com.au/



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Ref. No. Document / Report

17 Marsh H and Lawler I R (206) Dugong distribution and abundance on the urban coast of Queensland: a basis for management. Marine and Tropical Science Research Facility Interim Projects 2005-06 FINAL Report Project 2.

18 Report can be accessed via URL: www.cqpa.com.au/pages/environment /enviro_monitor.htm

19 QCLNG Project, Environmental Impact Statement (July 2009) and Supplementary Environmental Impact Statement (January 2010).

20 Kinloch M, Summerson R, Curran D (2003) Domestic vessel movements and the spread of marine pests: Risks and Management Approaches. Bureau of Rural Sciences, Department of Agriculture, Fisheries and Forestry.

21 Masini R, Sim C, McAlpine K (2008) Environmental Impact Assessment of Large-scale Dredging Projects.

22 SKM 2008 Pluto LNG Development: Dredging and Spoil Disposal Management Plan.

23 GeoCoastal (2009). QCLNG Pipeline Route Gladstone Harbour, Queensland. Sediment Quality Assessment Report, December 2009

http://www.cqpa.com.au/pages/environment%20/enviro_monitor.htm

http://www.cqpa.com.au/pages/environment%20/enviro_monitor.htm



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APPENDIX 1. – GEOCHEMICAL CORE LOCATIONS AND ANALYSIS

QGC geotechnical assessment of the Narrows Section [Ref. 23] is outlined in the tables contained in this Appendix (Table A.1 and A.2).

Table A.1 - Narrows Section Vibrocore Locations

Table A.2 - Physical Characteristics of Material Present at the Narrows Section [Ref. 23]

PSD

Cobbles (>6cm)

Gravel (>2mm)

Sand (0.06-2.00 mm)

Silt (2-60 µm)

Clay (<2 µm)

% % % % %

Core ID Sample Depth

V02 0-0.2 <1 <1 94 1 5

V02 0.5-1.0 <1 1 19 41 39

V05 0.8-1.0 <1 100 <1 <1 <1

V09 0-0.5 <1 <1 93 1 6

V09 3.0-3.5 <1 1 40 25 34

V09 5.5-6.0 <1 1 62 18 19

V09 10.0-10.6 <1 11 60 12 17

V14 0-0.5 <1 55 25 10 10

V14 1.0-1.5 <1 26 42 16 16

V14 1.6-2.0 <1 65 19 9 7

V14 2.5-3.0 <1 <1 8 52 40

V16 1.0-1.5 <1 81 14 4 1

The material to be dredged for the Narrows Section does not contain any introduced contaminants.

Projection UTM MGA Zone 56, datum GDA 94

Borehole EASTING (m) NORTHING (m)

V02 312,794.15 7,372.397.73

V05 313,066.10 7,392,393.86

V09 313,453.50 7,372,397.00

V14 312,921.12 7,372,303.37

V16 313,296.75 7,372,297.14



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APPENDIX 2 – DMP INFORMATION REQUIREMENTS

DERM DMP information requirements for Dredging/Dumping application as prescribed in Coastal Protection and Management Regulation 2003 (Coastal Regulation) and relevant Narrows Crossing DMP section.

Ref. Information/ Requirement NC-DMP Section(s)

Information about the land/activity

1 Two copies of a plan drawn to a suitable scale 3

o Showing boundaries of the dredging area

o hydrographic survey of that land on lines not more than 20m apart;

o proposed areas where the quarry material will be taken ashore or transported over and the proposed location of any stockpile, reclamation and disposal or fill areas;

o adjacent property boundaries, roads and

o navigation channels, navigation aids, pipelines, cables, wharves and any other structures (in marine land)

2 Plans showing the depth of dredging and the anticipated final alignment and slope of batters, together with an indication as to whether this work will result in a stable alignment or if recurrent maintenance dredging will be required.

3

3 Characteristics of quarry material to be removed. 4

4 Purpose/use of quarry material. 3, 6

5 Methods of extraction of quarry material and disposal of dredge spoil (including equipment to be used).

3

6 Maximum extraction rate of quarry material in cubic metres per year. 3

7 Agreement from:

o owner(s) of land on which the material is to be deposited or stockpiled; and

o owner(s) of land over which the material will be transported either by pipeline or truck



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Information addressing key coastal plan policies

8 Policy 2.1.1 Areas of state significance (social and economic) 2

Provide details of any potential impacts on areas of state significance (social and economic).

9 Policy 2.1.6 / 2.1.8 Extractive industry/Dredging - 2, 3

Provide details of how the extraction of resources and/or dredging will be undertaken so as to:

o maintain the ability of the site or adjoining land to function as a barrier protecting lands from coastal waters;

o maintain beach foreshore or riverbank stability;

o maintain natural coastal processes that supply sand to beaches;

o maintain the stability of the dredging area;

o maintain water quality (in accordance with policy 2.4.1), groundwater levels of underlying aquifers and coastal wetlands and the local drainage regime on the site and adjoining areas;

o have no significant adverse impacts on fisheries (commercial, Indigenous Traditional Owner and recreational), fishing grounds or spawning and nursery areas;

o maintain coastal habitats (including their protection from potantial adverse impacts from the disturbance of acid sulphate soils);

o not cause unacceptable risk to existing land uses from coastal hazards (in accordance with policy 2.2.4); and

o not adversely impact on any cultural resources of Indigenous Traditional Owners (in accordance with policy 2.5.1).

If extracting material from tidal rivers or other areas that supply sand to the coast, demonstrate that the extraction will not result in net erosion.

Where dredged material comprises clean sand provide details of how the sand will be kept within the active beach system.

For any extraction or dredging operation; provide details of whether:

o the sediment contains toxicants (listed under the Australian Water Quality Guidelines for Fresh Water and Marine Waters);

o the level and nature of the toxicant; and

o whether disturbance of the contaminated sediment is likely to result in unacceptable impacts on coastal resources and their values.

5



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Information addressing key coastal plan policies (continued)


10 Policy 2.3.1 Future need for access -.

Provide details of whether the development will result in net loss of access to the foreshore or public usability of coastal waters and, if so, demonstrate why the loss is acceptable

2

11

Policy 2.4.1 Water quality management (WQM)

Assessment of impacts on marine life (i.e. direct impacts on marine life located in the dredge path, indirect impacts on marine life due to increased sedimentation and turbidity, direct impacts on marine life from the dumping of dredged material at sites remote to the dredge path) and proposals for mitigation of siltation, turbidity and disruption to the aquatic environment by the proposed works.

Quantification of the quality and quantity of dredge spoil and/or fill material involved including proposals for adequate disposal of dredge spoil, and safeguards required dealing with leachate problems arising there from.

Assessment of impact on management of waters (environmental values and water quality objectives) detailed in the Environmental Protection (Water) Policy 1997 schedule 1, columns 1 and 2 and techniques proposed for dredging, handling and/or disposing of dredge spoil, including any requirements to meet the water quality standards imposed by the DERM with regard to the classification of waters relevant thereto.

4, 6

12 Policy 2.4.5 Groundwater quality (GWQ)

Provide details of potential impacts on groundwater quality and recharge rates. Applications involving extraction should include a groundwater hydrology assessment within the affected groundwater aquifer.

2,4

13 Policy 2.8.1 Areas of state significance (natural resources) –

Details of potential impacts on areas of State significance (natural resources).

2,4

14 Policy 2.8.2 Coastal wetlands –

Details of potential impacts on coastal wetland systems

2,4

15 Policy 2.8.3 Biodiversity

Details of potential impacts on ecosystems and habitats in a regional and local context.

2,4

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