Environmental Impact Statement
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MANNUM WATERS MARINA & RESIDENTIAL DEVELOPMENT ENVIRONMENTAL IMPACT STATEMENT VOLUME 1 - EIS Prepared for TALLWOOD PTY LTD Suite 4/166 Main South Rd, Morphett Vale SA 5162 November 2006 ENVIRONMENT IMPACT STATEMENT Volume 1 - EIS Issued for Public Consultation – May 2007 The Mannum Waters EIS comprises three volumes: Volume 1 – EIS Volume 2 – Appendices Executive Summary Copyright © 2007 Tallwood Pty Ltd All rights reserved. No part of this publication may be reproduced, stored in a public retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the permission of the copyright holder. ISBN # 978-0-9803717-0-3 Environmental Impact Statement i Volume 1 Project Team Tallwood Pty Ltd Jerry Frankiw Project Manager, Board Member Matt Gazzard Project Director, Hickinbotham Group Michael Hickinbotham Project Manager, Board Member Robert Pettifor Project Manager, Board Member David Potter Project Director, Board Member Andrew Rushworth Project Manager, Board Member John Weber Project Manager, Board Member Kellogg Brown & Root Pty Ltd Terry Bell Town Planner Richard Coombe Project Director Paul Greenhalgh Environmental Scientist Tim Harrington Environmental Scientist Coffey Geosciences Pty Ltd Roger Grounds Geotechnical Consultant Computational Fluid Mechanics International Dr Gary Tong Water Modelling Consultant DCJM Pty Ltd David Potter Civil Engineering Consultant Eco Management Services Pty Ltd Paul Manning Environmental Science Consultant Hickinbotham Group Matt Gazzard Residential Development Consultant Hudson Howell Phil Hudson Economic Assessment Consultant Mannum Aboriginal Community Association Inc Richard Hunter Aboriginal Heritage Consultant Murray F Young & Associates Murray Young Transport Management Consultant Pettifor Civil Robert Pettifor Civil Contracting Consultant Rushworth & Co Andrew Rushworth Financial Consultant Sonus Pty Ltd Chris Turnbill Noise Assessment Consultant TimeMap Pty Ltd Jude Bonell Heritage Consultant Keryn Walshe Heritage Consultant Vivienne Wood Heritage Consultant Water Search Michael Cobb Hydrogeologist Weber Frankiw & Associates Pty Ltd Jerry Frankiw Surveyor John Weber Surveyor Environmental Impact Statement ii Volume 1 Acknowledgements In the preparation of this Environmental Impact Assessment, Tallwood Pty Ltd was assisted by a number of organisations. Tallwood Pty Ltd extends their appreciation to those who contributed, including: • Mid Murray Council • Mannum Aboriginal Community Association Incorporated • Mannum Golf Club • SA Water • ETSA Utilities Tallwood Pty Ltd also acknowledges the work undertaken on behalf of the Mid Murray Council by Mr Michael Wohlstadt, Planning Advisory Services, and Mr Paul Manning, Eco Management Services, in the preparation of the report entitled “Preliminary Environmental Assessment”. Environmental Impact Statement iii Volume 1 Table of Contents 1 INTRODUCTION 1-1 1.1 BACKGROUND 1-1 1.2 DEVELOPMENT ASSESSMENT PROCESS 1-2 1.3 OTHER LEGISLATION 1-3 1.4 COMMUNITY CONSULTATION 1-3 1.5 ENVIRONMENTAL IMPACT STATEMENT 1-4 2 DEVELOPMENT PROPOSAL 2-1 2.1 OVERVIEW 2-1 2.1.1 Location 2-1 2.1.2 Summary of provision 2-8 2.1.3 Staging 2-9 2.1.4 Best practice guidelines 2-12 2.1.5 Modifications to proposal since issues paper 2-13 2.1.6 Artist’s impression 2-14 2.2 RESIDENTIAL AREAS 2-16 2.2.1 Overview 2-16 2.2.2 Urban design 2-16 2.2.3 Waterfront easement 2-23 2.2.4 House owner’s charter 2-24 2.2.5 Design guidelines 2-24 2.3 MARINA AND WATERWAYS 2-24 2.3.1 Permanent living houseboat moorings 2-26 2.3.2 General houseboat moorings 2-27 2.3.3 Casual moorings 2-28 2.3.4 Small craft household moorings 2-28 2.3.5 River entrances 2-29 2.3.6 Marina bulkheads 2-33 2.3.7 Marina owner’s charter 2-36 2.3.8 Riparian buffers 2-36 2.3.9 Water use and transfer 2-37 2.3.10 Water quality monitoring 2-37 2.4 COMMERCIAL AREA 2-38 2.4.1 General store/boat chandlery 2-38 2.4.2 Restaurant/café/tourist accommodation 2-39 2.4.3 Marina office 2-39 2.4.4 Commercial boat operators’ offices 2-39 2.4.5 Interpretive centre (indigenous culture/eco-systems, etc.) 2-39 2.4.6 Public toilets 2-39 2.4.7 General concepts and building guidelines 2-39 2.4.8 Refuelling facility 2-39 2.4.9 Car parking 2-40 2.4.10 Boat ramp and trailer parking 2-40 2.5 PUBLIC RECREATION FACILITIES 2-40 2.5.1 Playground and picnic areas 2-42 2.5.2 Walking and cycling trails 2-43 2.5.3 Golf course extension 2-46 Environmental Impact Statement iv Volume 1 2.5.4 Wetland reserve 2-46 2.5.5 Revegetation areas 2-46 2.5.6 Car parking 2-46 2.6 ABORIGINAL CULTURAL HERITAGE AREAS 2-47 2.7 PUBLIC INFRASTRUCTURE AND UTILITIES 2-47 2.7.1 Roads 2-47 (A) Belvedere Road access 2-47 (B) Main access road 2-50 (C) Secondary access road 2-50 (D) Internal residential roads 2-50 (E) Marina road 2-51 (F) Road design 2-51 2.7.2 Stormwater 2-52 (A) Site run-off 2-52 (B) Creek flows 2-55 2.7.3 Wastewater 2-55 (A) Existing situation 2-55 (B) Wastewater development proposal 2-56 (C) Sewer collection system 2-56 (D) Reclaimed water 2-58 (E) SA Water 2-58 2.7.4 Water supply 2-58 2.7.5 Electricity supply and public lighting 2-59 2.7.6 Telecommunications 2-59 2.7.7 Gas 2-60 2.7.8 Embankment and levees 2-60 2.7.9 Waste management 2-63 2.8 CONSTRUCTED ANABRANCH CHANNEL AND WETLAND 2-63 2.8.1 Concept design 2-63 (A) New outlet channels from the marina, waterways and treatment wetland 2-63 (B) Ephemeral wetland 2-66 2.8.2 Site issues for channel and wetland design 2-68 (A) Land and river water levels 2-68 (B) Hydrological regime and wetland habitats 2-73 (C) Wetland design and water level management 2-74 (D) Water volumes 2-76 (E) Groundwater 2-76 2.8.3 Detailed design investigations 2-76 (A) Groundwater 2-76 (B) Earthworks and final design 2-77 (C) Survey information 2-77 (D) Anabranch channel outlet 2-77 (E) Maintenance access 2-77 (F) Landscaping plan 2-77 (G) Public access 2-77 (H) Carp control 2-78 2.9 URBAN LANDSCAPE DESIGN AND REVEGETATION 2-78 2.9.1 General Character 2-78 (A) Objectives 2-78 (B) The vision for Mannum Waters 2-78 2.9.2 Urban design landscape guidelines 2-78 2.9.3 Revegetation 2-79 2.10 FENCING 2-81 Environmental Impact Statement v Volume 1 3 SUBJECT LAND 3-1 3.1 DESCRIPTION 3-1 3.1.1 Existing land use 3-1 3.1.2 Existing environment 3-1 3.1.3 Previous marina proposal 3-3 3.1.4 Adjoining uses 3-3 3.2 TENURE 3-7 4 NEED FOR DEVELOPMENT 4-1 4.1 DEVELOPMENT OBJECTIVES 4-1 4.2 STRATEGIC DIRECTIONS 4-2 4.3 BENEFITS 4-2 4.3.1 Strengthen regional centre 4-2 4.3.2 Orderly growth 4-4 4.3.3 Improve environmental controls for houseboat mooring 4-4 4.3.4 Provide environmentally sensitive waterfront housing 4-5 4.3.5 Remove wastewater lagoons from floodplain 4-5 4.3.6 Provide water use advantages 4-6 4.3.7 Upgrade infrastructure 4-6 4.3.8 Preserve Aboriginal cultural sites 4-7 4.3.9 Provide interpretive facilities 4-7 4.3.10 Rehabilitate dairy flats 4-7 4.3.11 Conserve and create riverine wetlands 4-7 4.3.12 Revegetate degraded areas 4-7 4.3.13 Extend wildlife habitats 4-7 4.3.14 Provide for the extension of golf course to 18 holes 4-8 4.4 COSTS 4-8 4.4.1 Provision of infrastructure to Government 4-8 4.4.2 Increased rates income to Council 4-8 4.5 CONSEQUENCES OF NOT PROCEEDING 4-8 5 EXISTING RIVER ENVIRONMENT 5-1 5.1 INTRODUCTION 5-1 5.2 RIVER STATISTICS 5-1 5.2.1 River flows 5-1 5.2.2 River levels 5-2 5.2.3 River flooding 5-3 5.2.4 River water quality 5-5 (A) Key water quality issues 5-5 (B) General water quality at Mannum 5-6 (i) Salinity 5-7 (ii) Nutrients and algal blooms 5-7 (iii) Pathogens 5-8 (iv) Turbidity 5-9 (v) Heavy metals 5-9 (C) Water quality improvement initiatives 5-9 5.2.5 River water usage 5-10 5.3 BOATING 5-11 5.3.1 Recreational boating 5-11 5.3.2 Houseboats 5-14 (A) Houseboat numbers 5-14 Environmental Impact Statement vi Volume 1 (B) Moorings – number and distribution 5-15 5.3.3 Recreational and commercial fishing 5-16 5.3.4 General recreation 5-17 5.4 EXISTING SHIPWRECKS 5-17 6 EXISTING PHYSICAL ENVIRONMENT 6-1 6.1 INTRODUCTION 6-1 6.2 CLIMATE 6-1 6.2.1 Rainfall 6-1 6.2.2 Temperature 6-2 6.2.3 Relative humidity 6-2 6.2.4 Winds 6-3 6.2.5 Evaporation 6-3 6.3 GEOLOGY 6-4 6.4 HYDROGEOLOGY 6-6 6.4.1 Unconfined aquifers 6-6 6.4.2 Confined aquifer 6-7 6.4.3 Groundwater flow 6-7 6.5 GEOTECHNICAL CONDITIONS 6-7 6.5.1 Geotechnical results 6-8 6.5.2 Geophysical results 6-10 6.5.3 Groundwater level observations 6-10 6.5.4 Laboratory test results 6-11 (A) Reference criteria (soil) 6-11 (B) Soil analysis results 6-12 6.5.5 Acid sulphate soils 6-12 6.6 EXISTING INFRASTRUCTURE 6-13 6.6.1 Roads and tracks 6-13 6.6.2 Buildings 6-13 6.6.3 Stormwater 6-14 6.6.4 Wastewater 6-15 6.6.5 Water supply 6-18 6.6.6 Irrigation systems 6-18 6.6.7 Electricity supply and public lighting 6-19 6.6.8 Telecommunications 6-19 6.6.9 Gas 6-19 6.6.10 Embankments and levees 6-19 6.6.11 General 6-19 7 EXISTING BIOLOGICAL ENVIRONMENT 7-1 7.1 INTRODUCTION 7-1 7.2 REGIONAL LANDSCAPE FLORA CONTEXT 7-1 7.2.1 Mannum swamps (north) 7-2 7.2.2 Reedy Creek (south) 7-2 7.3 FLORISTIC COMMUNITIES/HABITAT AVAILABILITY 7-4 7.3.1 Methodology 7-4 7.3.2 Communities 7-5 7.4 FLOOD PLAIN/SWAMP, CLIFF FACE AND HIGHLAND ZONES 7-8 7.5 FLORA AND HABITATS IN THE BASEBY LINEAR WETLAND 7-18 Environmental Impact Statement vii Volume 1 7.5.1 Definition of habitats and management units 7-18 7.5.2 Ephemeral wetlands (management unit 1) 7-18 (A) Description 7-18 (B) Red Gum health assessment 7-29 7.5.3 Riparian woodlands and shrublands (management unit 2) 7-30 (A) Description 7-30 (B) Red Gum health assessment 7-34 7.5.4 River Murray