Pilot Offshore Artificial Reefs Preliminary Environmental Assessment
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Report to: NSW Department of Primary Industries Pilot Offshore Artificial Reefs Preliminary Environmental Assessment FINAL February 2008 Offshore Artificial Reefs Preliminary Environmental Assessment February 2008 Report Prepared for: NSW Department of Primary Industry (DPI) 202 Nicholson Street Cronulla, NSW, 2203 Report Prepared by: The Ecology Lab Pty Ltd 4 Green Street Brookvale, NSW, 2100 Phone: (02) 9907 4440 Report Number – 30/0708 B Report Status – Final, 29 February 2008 © This document and the research reported in it are copyright. Apart from fair dealings for the purposes of private study, research, criticism or review, as permitted under the Copyright Act 1968, no part may be reproduced by any process without written authorisation. Direct all inquiries to the Director, The Ecology Lab Pty Ltd at the above address. Pilot Offshore Artificial Reefs – Preliminary Environmental Assessment Final, February 2008 TABLE OF CONTENTS Executive Summary..............................................................................................................................i 1.0 Introduction ...................................................................................................................................3 1.1 Artificial Reefs Overview.........................................................................................................3 1.2 History of NSW Artificial Structure Use ...............................................................................7 1.3 Need for the Project ..................................................................................................................9 1.4 Objectives ...................................................................................................................................9 1.5 Project Description..................................................................................................................10 2.0 Preliminary Design of Offshore Artificial Reefs.....................................................................12 3.0 Planning and Legislative Requirements ..................................................................................13 3.1 State Legislation ......................................................................................................................13 3.1.1 Environmental Planning and Assessment Act 1979 ...................................................13 3.1.2 Conservation Legislation ................................................................................................13 3.1.3 Coastal Protection Legislation........................................................................................13 3.2 Commonwealth Legislation ..................................................................................................14 3.2.1 Environment Protection (Sea Dumping) Act 1981 ......................................................14 3.2.3 Environmental Protection and Biodiversity Conservation Act 1999........................15 3.2.4 The Historic Shipwrecks Act (1976) ..............................................................................15 4.0 Site Selection and Constraints Mapping..................................................................................16 4.1 Constraints Mapping..............................................................................................................16 4.2 Sub-Regions .............................................................................................................................18 4.3 Existing Environment.............................................................................................................18 4.3.1 Newcastle Region.............................................................................................................19 4.3.1.1 North (Stockton Bight) .............................................................................................19 4.3.1.2 South (south of Nobby’s Head)...............................................................................19 4.3.2 Sydney Region..................................................................................................................19 4.3.2.1 North (Broken Bay to Palm Beach).........................................................................19 4.3.2.2 South (Bate Bay) ........................................................................................................20 4.3.2.3 Alternative (South Head to Bondi).........................................................................20 4.3.3 Wollongong.......................................................................................................................20 4.3.3.1 North (Stanwell Tops to Bulli) ................................................................................20 4.3.3.2 South (offshore from Perkins Beach)......................................................................20 5.0 Preliminary Environmental Assessment .................................................................................21 5.1 Environmental Risk Analysis................................................................................................21 The Ecology Lab Pty Ltd – Marine and Freshwater Studies Pilot Offshore Artificial Reefs – Preliminary Environmental Assessment Final, February 2008 5.1.1 Background.......................................................................................................................21 5.1.2 Results................................................................................................................................24 5.2 Further Assessments...............................................................................................................24 6.0 Conclusions..................................................................................................................................29 7.0 Acknowledgements ....................................................................................................................30 8.0 References ....................................................................................................................................31 Appendices .........................................................................................................................................33 The Ecology Lab Pty Ltd – Marine and Freshwater Studies Pilot Offshore Artificial Reefs – Preliminary Environmental Assessment Final, February 2008 List of Tables Table 1: Explanation of methodology for the Offshore Artificial Reef risk assessment exercise. Table 2: Assessment of significance in accordance to scores of probability (likelihood) and consequence (Table 1). Table 3: Results of risk assessment workshop (17/01/08) on Offshore Artificial Reefs. List of Figures Figure 1: An artificial reef made from tyres in Borneo, Malaysia. Figure 2(a): Examples of ‘design specific’ artificial reef units used in South Korea - individual concrete cube units. Figure 2(b): Examples of ‘design specific’ artificial reef units used in South Korea - complex steel unit designs. Figure 3: Individual concrete ‘Reef Ball’ artificial reef units deployed together in Lake Macquarie forming a reef group. Figure 4: A FAD (Fish Aggregating Device) located off Laurieton on the NSW mid north coast. Figure 5: A barge loaded with Reef Balls ready for deployment in Lake Macquarie. Figure 6: A 10 m tall, 35 tonne design specific steel artificial reef unit waiting for deployment on Cheju Island, South Korea. Figure 7: Overview map of the Newcastle, Sydney and Wollongong Study Regions. The Ecology Lab Pty Ltd - Marine and Freshwater Studies Pilot Offshore Artificial Reefs – Preliminary Environmental Assessment Final, February 2008 EXECUTIVE SUMMARY The New South Wales Department of Primary Industries (DPI, Fisheries), with funding from the Recreational Fishing Trust, aims to improve recreational fishing opportunities in NSW through the development of Offshore Artificial Reef structures (OARs) at selected locations along the NSW coast. DPI already has implemented a program of deployment of Fish Aggregating Devices (FADs) for enhancement of pelagic fishing and has underway a program of deployment of artificial reefs (using reef balls) in estuaries. The design and deployment of the reef units for OARs has drawn on systems designed and used overseas, particularly in Korea and Japan. Whilst many designs have been used, the preferred type is tending towards relatively open steel structures which are placed on sedimentary habitats. Local coastal processes (e.g. current and wave climate) and seabed characteristics play a major role in the design of the reef units. At this preliminary stage, it is proposed that up to four individual artificial reef units will be used to construct the OARs and will be fabricated from steel, and be deployed in areas of moderately firm sandy seabed remote from existing natural rocky reefs at water depths of approximately 25 m to 40 m. DPI proposes to install OARs at three locations along the mid coast of NSW off Newcastle, Sydney and Port Kembla. This will require assessment under Part 3A of the Environmental Planning and Assessment Act 1979. This report is a preliminary environmental assessment of the proposal and is based on a desktop study used to identify prospective sites and map potential constraints. DPI commissioned The Ecology Lab Pty Ltd, who in turn teamed-up with Worley Parsons Pty Ltd (incorporating Patterson Britton & Partners) to undertake the study. Once the constraints mapping