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Geotechnical Interpretive Report

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Geotechnical Interpretive Report Geotechnical Interpretive Report Document Ref: AGH-CEP0-EG-REP-0009 Geotechnical Interpretive Report In May 2016 the Special Minister of State asked Infrastructure Victoria to provide advice on the future capacity of Victoria’s commercial ports. Specifically, the Minister has asked for advice on when the need for a second container port is likely to arise and which variables may alter this timeline. The Minister has also asked for advice on where a second container port would ideally be located and under what conditions, including the suitability of, and barriers to investing in, sites at the Port of Hastings and the Bay West location. In undertaking this task, Infrastructure Victoria reviewed work that was completed as part of the Port of Hastings development project before it was cancelled in 2014. This document forms part of the initial work undertaken for the proposed port development at Hastings. Infrastructure Victoria considers that much of the previous Hastings work, although preliminary in nature, is relevant and suitable for informing a strategic assessment. Therefore, Infrastructure Victoria has made the reports previously commissioned for the development project part of the evidence base on which Infrastructure Victoria will use in providing the Minister with advice. The opinions, conclusions and any recommendations in this document are based on conditions encountered and information reviewed at the date of preparation of the document and for the purposes of the Port of Hastings Development Project. Infrastructure Victoria and its consultants have used the information contained in these reports as an input but have not wholly relied on all the information presented in these reports. D R A F T Port of Hastings Development Project – Design and Engineering Geotechnical Interpretive Report Client: Port of Hastings Development Authority ABN: 33 737 350 749 Prepared by the AECOM + GHD Joint Venture AECOM Australia Pty Ltd Level 9, 8 Exhibition Street, Melbourne VIC 3000, Australia T +61 3 9653 1234 F +61 3 9654 7117 www.aecom.com + GHD Pty Ltd Level 8, 180 Lonsdale Street, Melbourne VIC 3000, Australia T +61 3 8687 8000 F +61 3 8687 8111 www.ghd.com JV ABN: 57 194 323 595 The AECOM + GHD Joint Venture in Australia and New Zealand are certified to the latest version of ISO9001, ISO14001, AS/NZS4801 and OHSAS18001. © AECOM + GHD Joint Venture. All rights reserved. This Report has been prepared by the AECOM + GHD Joint Venture for the Port of Hastings Development Authority and may only be used and relied on by the Port of Hastings Development Authority for the purpose agreed between the AECOM + GHD Joint Venture and the Port of Hastings Development Authority as set out in this Report. The AECOM + GHD Joint Venture otherwise disclaims responsibility to any person other than the Port of Hastings Development Authority arising in connection with this Report. The AECOM + GHD Joint Venture also excludes implied warranties and conditions, to the extent legally permissible. The services undertaken by the AECOM + GHD Joint Venture in connection with preparing this Report were limited to those specifically detailed in the Report and are subject to the scope limitations set out in the Report. The opinions, conclusions and any recommendations in this Report are based on conditions encountered and information reviewed at the date of preparation of the Report. The AECOM + GHD Joint Venture has no responsibility or obligation to update this Report to account for events or changes occurring subsequent to the date that the Report was prepared. The opinions, conclusions and any recommendations in this Report are based on assumptions made by the AECOM + GHD Joint Venture described in this Report. The AECOM + GHD Joint Venture disclaims liability arising from any of the assumptions being incorrect. Port of Hastings Development Project – Design and Engineering Geotechnical Interpretive Report 13-Mar-15 D R A F T Quality Information Project Port of Hastings Development Project – Design and Engineering Document Geotechnical Interpretive Report Ref AGH-CEP0-EG-REP-0009 Date 13-Mar-15 Prepared by Stephen Martin, Mark Modrich, Trevor O’Shannessy Reviewed by Ian Cookson, Venket Naidu Revision History Authorised Revision Revision Details Date Name/Position Signature A 3-Sept-14 Table of Contents B 22-Sept-14 Table of Contents Peter Fountain Project Director C 5-Nov-14 Draft Peter Fountain Project Director D 19-Dec-14 Final Draft Peter Fountain Project Director 0 13-Mar-15 Final Working Draft Peter Fountain Project Director Port of Hastings Development Project – Design and Engineering Geotechnical Interpretive Report 13-Mar-15 D R A F T Table of Contents Executive Summary 1 1.0 Introduction 2 1.1 Background Information 2 1.2 Purpose of this Report 4 1.3 Scope and Limitations 4 2.0 Development Outline 5 3.0 Regional Setting 6 3.1 Regional Geology 6 3.1.1 Stratigraphy 8 3.1.2 Geological Structure 9 3.2 Geomorphology 9 3.2.1 General 9 3.2.2 Western Port: Bathymetry, Tidal and Marine Processes, Sedimentology 10 3.2.3 Western Port: Coastal Geomorphology and Processes 10 3.2.4 Long Island Point and Hastings Bight: Geology and Geomorphology 10 3.2.5 Long Island Point and Hastings Bight: Coastal and Nearshore Processes 10 3.2.6 Long Island Point and Hastings Bight: Historical Changes 10 3.2.7 Tyabb Tidal Flats and Banks 11 3.3 Seismicity 12 3.3.1 Hastings Structural Settings 12 3.3.2 Regional Seismicity 13 3.3.3 Local Seismicity 14 4.0 Previous Site Development 19 4.1 General 19 4.2 The Port 19 4.3 Shipping Channels and Previous Dredging 19 4.4 Port Terminal Infrastructure 21 4.5 Special Use Zone (SUZ1) 25 5.0 Pre 2013/2014 Site Investigations 26 5.1 Long Island Point 28 5.1.1 Onshore - Existing Reclamation Area / Old Tyabb Reclamation 28 5.1.2 Onshore- BlueScope Steel Property 28 5.1.3 Intertidal Area 29 5.1.4 Offshore 29 5.2 North Arm – Between Crib Point and Long Island point 30 5.2.1 Onshore 30 5.2.2 Offshore 30 5.3 Crib Point 30 5.3.1 Onshore 30 5.3.2 Offshore 30 5.4 Stony Point 30 5.4.1 Onshore 30 5.4.2 Offshore 30 5.5 Western Channel 31 5.6 East Arm (Anchorage) 32 5.7 1974 Geophysical Survey 32 6.0 2013/2014 Site Investigations 33 6.1 Overview 33 6.2 Marine Geophysical Survey 35 6.2.1 Interpretation of the Geophysical Data 35 6.2.2 Geophysical Survey Limitations 36 6.2.3 North Port Area 37 Port of Hastings Development Project – Design and Engineering Geotechnical Interpretive Report 13-Mar-15 4 D R A F T 6.2.4 Port Area 38 6.2.5 North Arm 39 6.2.6 Western Channel 40 6.2.7 Anchorage 42 6.2.8 Summary 43 6.3 Terrestrial Geotechnical Investigation 44 6.3.1 Scope of Investigation 44 6.3.2 Summary of Boreholes Test pits and CPTs 45 6.3.3 In situ testing 45 6.3.4 Groundwater well development and monitoring 45 6.3.5 Laboratory Testing 46 6.3.6 Factual Report 46 6.4 Marine Geotechnical Investigations 46 6.4.1 Scope of Investigation 46 6.4.2 Summary of boreholes and CPTs 47 6.4.3 In situ sampling and testing 48 6.4.4 Overview of Laboratory Testing 48 6.4.5 Laboratory Tests 49 6.4.6 Factual Reports 51 7.0 Site Geology 52 7.1 General 52 7.2 Anthropogenic Deposits 52 7.2.1 Old Tyabb Reclamation (Fill 1) 52 7.2.2 Other Fill (Fill 2) 52 7.3 Quaternary Deposits 52 7.3.1 Dune Sands (Q1) 52 7.3.2 Alluvium (Q2) 52 7.3.3 Quaternary marine deposits (Q3) 52 7.3.4 Undifferentiated Quaternary (Q4) 52 7.4 Baxter Formation (Tb) 53 7.5 Sherwood Formation (Tm) 53 7.6 Yallock Formation (Ty) 54 7.7 Older Volcanics Group (Tvo) 54 7.8 Silurian Sandstone and Siltstones (S) 54 8.0 Geotechnical Conditions 55 8.1 Strata Overview 55 8.1.1 Terrestrial Project Area 55 8.1.2 North Port Area 56 8.1.3 Port Area 57 8.1.4 North Arm 61 8.1.5 Western Channel and Anchorage 62 8.2 Characteristic Subsoil Properties 63 8.2.1 Old Tyabb Reclamation Fill 63 8.2.2 Quaternary deposits (Q3) 64 8.2.3 Undifferentiated Quaternary deposits (Q4) 71 8.2.4 Baxter Formation (Tb) 74 8.2.5 Sherwood Formation (Tm) 86 8.2.6 Older Volcanics (Tvo) 93 8.2.7 Silurian 94 8.3 Groundwater 95 8.3.1 General 95 8.3.2 Regional Hydrostratigraphy 95 8.3.3 Conceptual Hydrogeological Model 95 8.3.4 Groundwater Levels 96 9.0 Geotechnical Considerations for Port Expansion 97 Port of Hastings Development Project – Design and Engineering Geotechnical Interpretive Report 13-Mar-15 5 D R A F T 9.1 General 97 9.2 Dredging 97 9.2.1 Materials to be dredged 97 9.2.2 Dredging Equipment 99 9.3 Reclamation 100 9.4 Ground Improvement 101 9.4.1 Ground Improvement Techniques 102 9.5 Wharf Structures 108 9.6 Ancillary Structures and Facilities – Terrestrial Project Area 110 9.6.1 General 110 9.6.2 Soil Reactivity 110 9.6.3 Spread Footings 111 9.6.4 Piled Footings 111 9.7 Ancillary Structures and Facilities – Reclamation Area 112 9.7.1 General 112 9.8 Pavements 113 9.8.1 Pavement Types 113 9.8.2 Pavement Subgrade Conditions 114 9.9 Durability 115 9.10 Characteristic Engineering Parameters 116 9.11 Further Investigation 1 9.12 Instrumentation and Monitoring 1 10.0 3D Geological Model Development 3 11.0 Summary and Conclusions 4 11.1 General 4 11.2 Geology and Geomorphology 4 11.3 Site Description 5 11.4 Site Investigations 5 11.5 Geotechnical Considerations for Port Expansion 7 11.6 Characteristic Engineering Parameters 10 11.7 3D Geological Model Development 11 11.8 Conclusions and Recommendations 11 12.0 References 13 Appendix A Borehole Location Plans 15 Appendix B Cross-sections – Stratigraphy 16 Appendix C Cross Sections to -25mCD - Port Area 17 Appendix D In Situ and Field Test Data – Terrestrial 18 Appendix E In Situ and Field Test Data
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