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Western Port Gas Import Jetty and Pipeline Project

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Western Port Gas Import Jetty and Pipeline Project Witness Statement – Groundwater Impacts – Western Port Gas Import Jetty and Pipeline Project WESTERN PORT GAS IMPORT JETTY AND PIPELINE PROJECT WITNESS STATEMENT – GROUNDWATER – 25TH SEPTEMBER 2020 1.0 INTRODUCTION My name is, Jonathan Michael Medd. I am a Principal of Golder Associates Pty Ltd, Building 7, Botanicca Corporate Park, 570-588 Swan Street, Richmond, Victoria, 3121. I hold a Bachelor of Science (Hons) and a Master of Environmental Science and Hydrogeology. I have over 27 years’ experience in the field of environmental management and impact assessment, specialising in the areas of groundwater quality, flow, impact evaluation and contamination remediation. I am also appointed as an Environmental Auditor of Contaminated Land and Industrial Facilities in accordance with Section 53S of the Environment Protection Act 1970. My curriculum vitae is attached in APPENDIX A. In have been assisted by the following personnel in preparing this statement: Irena Krusic-Hrustanpasic (Principal Hydrogeologist – Golder Associates), who provided technical support and internal review of this statement. Stephen Makin (Senior Hydrogeologist – Golder Associates), who accompanied me during the site visit and has assisted in preparing background information to assist me in preparing this statement of evidence. 20350394-001-L-Rev0 1 Witness Statement – Groundwater Impacts – Western Port Gas Import Jetty and Pipeline Project 2.0 INSTRUCTIONS AND INFORMATION RELIED UPON I have been engaged by Hall & Willcox/Ashurst to provide a peer review and a corresponding Statement of Evidence and to present evidence at the Inquiry and Advisory Committee (IAC) Hearing in relation to groundwater impacts evaluated in EES Technical Report D Groundwater Impact Assessment, part of the Environmental Effects Statement (EES) for the Western Port Gas Import Jetty and Pipeline Project (“the Project”). AGL Wholesale Gas (AGL) and APA Transmission Pty Ltd (APA) are the Proponents for this project. Prior to preparation of this expert witness statement, I have had no involvement with the Project. My instructions to prepare this witness statement are set out in APPENDIX B. In preparing this statement, I visited publicly accessible areas of the pipeline alignment on 24 August 2020 to gain a general understanding of the project setting. I have relied upon the information provided in the following reports: Environmental Effects Statement (EES) (AGL and APA, July 2020) - Chapter 9 "Groundwater". EES Technical Report D Groundwater impact assessment. (AECOM, June 2020). EES Technical Report C Surface Water impact assessment (AECOM, June 2020), sections relating to waterway crossings. EES Technical Report E Contamination and acid sulfate soils impact assessment (AECOM, June 2020), sections having relevance to groundwater contamination and acid sulfate soils. EES Technical Report B Terrestrial and freshwater biodiversity existing conditions and impact assessment (Biosis, June 2020), sections having relevance to groundwater dependent ecosystems. AECOM letter “Crib Point EES – request for additional information”, dated 10 September 2020 (included here as APPENDIX C). Pipeline Licence Application in Attachment IX of the EES, Appendix J, Performance Objectives and Standards. Pipeline Licence Application in Attachment IX of the EES, Appendix J, Acid Sulfate Soils Management Protocol. 20350394-001-L-Rev0 2 Witness Statement – Groundwater Impacts – Western Port Gas Import Jetty and Pipeline Project Regional geological and hydrogeological information was also drawn from public sources, along with Golder’s experience in the area. References used include: Lakey, R. and Tickell, S.J., 1980. Hydrogeological Map of Western Port Basin. Geological Survey of Victoria. Lakey, R. and Tickell, S.J., 1981. Explanatory notes on the Western Port Groundwater Basin 1:100 000 Hydrogeological Map. Geological Survey of Victoria, Report No. 69. Southern Rural Water, 2010. Groundwater Management Plan, Koo Wee Rup Water Supply Protection Area. Southern Rural Water, 2014. Port Phillip and Western Port Groundwater Atlas. 20350394-001-L-Rev0 3 Witness Statement – Groundwater Impacts – Western Port Gas Import Jetty and Pipeline Project 3.0 FACTS, MATTERS AND ASSUMPTIONS 3.1 General Understanding of the Project The Proponent proposes to develop a new gas import facility and pipeline to be constructed in Victoria. The Project comprises two sets of works: 1. Gas Import Jetty Works – Liquefied Natural Gas (LNG) would be delivered by LNG carrier ships to a specialist ship (floating storage and regassification unit or FSRU) continuously moored at the Crib Point Jetty where it would be converted from liquid form back into gas when required to meet shortfalls in domestic gas supply. 2. Pipeline Works – a new underground pipeline approximately 57-kilometres long with associated above-ground infrastructure would transport the gas from the jetty into Victoria’s gas network near Pakenham. The Project would be located to the south-east of the Melbourne Central Business District between Crib Point and Pakenham. The Gas Import Jetty Works would be located at Crib Point within the Mornington Peninsula Shire. The Pipeline Works would extend from Crib Point to Pakenham, crossing Mornington Peninsula Shire, City of Casey and the Shire of Cardinia connecting to an existing gas distribution main east of Pakenham at Nar Nar Goon. Gas would be transferred from the FSRU via a pipeline to an onshore receiving facility adjacent to the jetty where additives are introduced (nitrogen and mercaptans). A Delivery Facility would be located east of Pakenham, and an End of Line Scraper Station (EOLSS) located at Nar Nar Goon. Of this infrastructure, the jetty works, Crib Point Receiving Facility, Pakenham Delivery Facility and mainline valves along the pipeline would be above-ground, so have no contact with groundwater. Below-ground infrastructure may interact with groundwater. This includes the gas pipeline, to be installed either by open trenching, directional drilling or horizontal boring, the EOLSS, and piles to support tanks at the Crib Point Receiving Facility (CPRF). Subsurface works associated with the pipeline and the on-shore gas receiving facility have the potential to interact with groundwater. This may be during construction, where temporary dewatering of excavations may be required, or once installed, where permanent structures may be in contact with groundwater. This statement relates to potential impacts on groundwater resulting from the proposed pipeline works associated with the project and the structural piles required for the nitrogen tank at the Crib Point Receiving Facility as these are the components of the project with the potential to interact with groundwater. 3.2 Geology and Hydrogeology Four broad zones having similar geological character are identified (Refer EES Technical Report D, Groundwater impact assessment, Figure A1 for the KP locations and geology): 1. The western margin of Western Port, between Crib Point and Tyabb (Pipeline Kilometre Point (KP0 to ~KP17) 2. Coastal plain from Tyabb to Pearcedale (~KP17 to KP27) 20350394-001-L-Rev0 4 Witness Statement – Groundwater Impacts – Western Port Gas Import Jetty and Pipeline Project 3. Western Port basin/Koo Wee Rup Swamp, between Pearcedale and Pakenham (~KP27 to ~KP50) 4. Nar Nar Goon hills (~KP50 to KP57). 3.2.1 Zone 1 In zone 1, the topography is undulating, from sea level to 25 m AHD. Surface geology is predominantly Tertiary-age sediments of the Sandringham Sandstone (previously named Red Bluff Sandstone or Baxter Sandstone or Brighton Group), with some outcrop of the underlying basement siltstone of the Silurian-age Murrindindi Supergroup. Quaternary-age deposits of alluvial and aeolian sediments occur in localised areas. Groundwater occurs typically between 1.5 m and greater than 3.5 mbgl in the project monitoring wells. 3.2.2 Zone 2 In zone 2, the pipeline route approaches the coast, at elevations below 10 m AHD. The surface geology is dominantly Quaternary sediments, such as dunes, swamp deposits and alluvium. These sediments shallowly overly Tertiary Sandringham Sandstone, which outcrops in places. Groundwater occurs typically between 1.5 m and 3.5 mbgl in the project monitoring wells. 3.2.3 Zone 3 Zone 3 is the Western Port Basin or former Koo Wee Rup swamp, a low-lying flat area which has been drained for agricultural use via shallow drainage channels. It is also within the Koo Wee Rup Water Supply Protection Area (WSPA). The surface geology is predominantly Quaternary-age swamp deposits. This material overlies the Tertiary-age sediments of the Sandringham Sandstone and is increasing in thickness to the north-east. Groundwater occurs typically below 3.9 mbgl in the project monitoring wells, although shallower levels may occur near waterways, or more widely in wet seasons. Groundwater elevation was below sea level at two of the monitoring wells (MW16 and MW18). This may be due to underlying aquifers where groundwater extraction has reduced groundwater pressures (SRW, 2014). 3.2.4 Zone 4 Zone 4 is to the north of the Western Port basin where the topography rises from 10 mAHD to around 50 mAHD at the northern end of the pipeline route. Quaternary sediments are present but become thinner to the north. The underlying Tertiary age basalt of the Thorpdale Volcanic Group outcrops in the north of the area. Groundwater occurs at approximately 1.1 mbgl (MW22) within the Quaternary sediments. Although no project monitoring wells have been installed
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