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W6298-2019-1 Attachment 1.Pdf Rev Rev Date Author / Editor Amendment A 30/08/2019 B Hirniak Issued for internal review 0 17/09/2019 N Phillips Issued to DWER for assessment Santos Ltd | Varanus Island Compression and Power Optimisation Project – Works Approval Supporting Document Page 2 of 82 Contents 1 Introduction 6 1.1 Overview 6 1.2 Purpose of this Document 6 1.3 Proponent 9 1.4 Premises Description 9 1.5 Project History 10 1.6 Scope of this Works Approval Application 12 1.7 Abbreviations and Acronyms 16 2 Existing Varanus Island Licences and Environmental Approvals 18 2.1 Leases 18 2.2 Environmental Approvals 18 2.3 Assessable Works 19 3 Existing Environment 20 3.1 Climate 20 3.2 Geomorphology 20 3.3 Groundwater 20 3.4 Surface Water 21 3.5 Vegetation and Flora 21 3.6 EPBC Act-listed Species 23 3.7 Terrestrial, Avian and Subterranean Fauna 25 3.8 Noise 33 3.9 Artificial Lighting 33 3.10 Conservation Reserves 33 4 Project Description 35 4.1 Varanus Island Compression and Power Optimisation Project (VICPOP) Overview 35 4.2 Gas processing and Equipment Overview 35 4.3 Condensate Processing 38 4.4 Existing and Additional VICPOP Utilities 38 4.5 Supporting Infrastructure and Services 40 4.6 Pre-commissioning and Commissioning Activities 43 4.7 VICPOP Work Phases and Timing 43 5 Stakeholder Consultation 44 5.1 Santos WA Stakeholder Consultation Strategy 44 5.2 Stakeholder Identification 44 6 Environmental Risk Assessment 46 6.1 Environmental Risk Assessment Method 46 Santos Ltd | Varanus Island Compression and Power Optimisation Project – Works Approval Supporting Document Page 3 of 82 6.2 Environmental Risk Assessment Summary 47 7 Emissions, Discharges and Wastes during Construction 48 7.1 Atmospheric Emissions 48 7.2 Noise and Vibration Emissions 48 7.3 Light Emissions 49 7.4 Discharges to Water 50 7.5 Discharges to Ground 50 7.6 Solid Non-hazardous Wastes 51 7.7 Liquid Non-hazardous Wastes 52 7.8 Hazardous Wastes 52 8 Emissions Discharges and Wastes during Operations 53 8.1 Atmospheric Emissions (Combustion) 53 8.2 Atmospheric Emissions (Dust) 59 8.3 Noise and Vibration Emissions 59 8.4 Light Emissions 60 8.5 Discharges to Water 61 8.6 Discharges to Ground 62 8.7 Solid Non-hazardous Wastes 62 8.8 Liquid Non-hazardous Wastes 63 8.9 Hazardous Wastes 63 9 Environmental Management 63 10 Works Approval Fee 64 11 Conclusion 64 12 References 65 Santos Ltd | Varanus Island Compression and Power Optimisation Project – Works Approval Supporting Document Page 4 of 82 List of Figures Figure 1-1: Regional Location of Varanus Island 7 Figure 1-2: Location of the VICPOP on Varanus Island 8 Figure 1-3: VICPOP Prescribed Premises Boundary 13 Figure 1-4: VICPOP Process Facility General Arrangement 14 Figure 1-5: VICPOP Process Facility Isometric View 15 Figure 3-1: VI Vegetation Association Map 22 Figure 3-2: Protected Migratory Bird Species Nesting Sites on VI 28 Figure 3-3: Marine Turtle Nesting Sites on VI 32 Figure 3-4: Regional Marine Habitats and Conservation Reserves 34 Figure 4-1: ESJV Gas Plant Process Block Diagram (Existing) 36 Figure 4-2: ESJV Gas Plant Process Block Diagram (Post VICPOP) 36 List of Tables Table 1-1: Characteristics of Existing Varanus Island Facilities 9 Table 1-2: VICPOP Characteristics 10 Table 1-3: Key differences between this WAA and the WAA for W5518/2013/1 11 Table 1-4: Abbreviations and Acronyms 16 Table 2-1: Primary Activities Described in Schedule 2 of L6284/1992/10 19 Table 3-1: Conservation Significant Fauna Species Potentially Occurring on VI or Surrounding Waters 23 Table 4-1: Performance Characteristics of the Proposed Humeceptor OWS 43 Table 4-2: Indicative Timing for VICPOP Activities 43 Table 5-1: Works Approval Consultation Summary 44 Table 8-1: Calculated Air Emissions from VICPOP Turbine Driven Machines under Routine Operating Conditions 55 Table 8-2: Point Source Emission Targets for during Normal Operation 55 Table 8-3: NEPM (Ambient Air Quality) Standards relevant to VICPOP 56 Table 8-4: NEPM Air Toxic Monitoring Investigation Levels and NSW EPA Assessment Criteria 57 Table 8-5: Predicted Air Emissions from VI under Routine Operating Conditions (Source: PE (2013)) 57 List of Appendices Appendix 1 – Varanus Island Emission Points to Air 68 Appendix 2 – VICPOP Process Flow Diagrams 70 Appendix 3 – Solar Turbines Data Sheets 72 Appendix 4 – Santos WA Risk Matrix 77 Appendix 5 – Santos Environmental Policy 78 Appendix 6 – VICP Air Quality Assessment (PE Report - 2013) 79 Appendix 7 – Works Approval W5518/2013/1 80 Santos Ltd | Varanus Island Compression and Power Optimisation Project – Works Approval Supporting Document Page 5 of 82 1 Introduction 1.1 Overview Santos WA Energy Limited (Santos WA) operates the Varanus Island (VI) Hub oil and gas facilities on the North West Shelf, Western Australia (WA). The regional location of VI is presented within Figure 1-1. In order to extend the life of the existing offshore John Brookes (JB) gas field, Santos intends to install on VI additional gas compression, electrical generation and associated utilities which together are referred to as the Varanus Island Compression and Power Optimisation Project (VICPOP; previously known as the Varanus Island Compression Project or VICP). Presently gas and associated liquids flow under natural pressure from the wellhead platform through the onshore John Brookes (JB) slug catcher then to the inlet of the amine trains on VI. Declining JB reservoir pressure means that in the future there will no longer be sufficient natural pressure to maintain the required production flow rate. The VICPOP will compensate for the future decline in reservoir pressures. 1.2 Purpose of this Document The installation and commissioning of two gas fuelled Solar Mars 100 gas turbine driven compressors (10.5 MW each), and one gas fuelled Solar Centaur 40 powered generator (3.5 MW), will cause a change to the volume of atmospheric emissions on VI. The purpose of this document is to provide information required to support an on-line application to the Department of Water and Environmental Regulation (DWER) for a Works Approval, pursuant to Section 53 of the Environmental Protection Act 1986 (EP Act) and the Environmental Protection Regulations 1987. This Works Approval Application (WAA) has been prepared with consideration of the following DWER publications: Guideline: Industry Regulation Guide to Licensing (June 2019) Guidance Statement: Environmental Siting (November 2016) Guidance Statement: Environmental Standards (September 2016) Santos Ltd | Varanus Island Compression and Power Optimisation Project – Works Approval Supporting Document Page 6 of 82 Figure 1-1: Regional Location of Varanus Island Santos Ltd | Varanus Island Compression and Power Optimisation Project – Works Approval Supporting Document Page 7 of 82 Figure 1-2: Location of the VICPOP on Varanus Island Santos Ltd | Varanus Island Compression and Power Optimisation Project – Works Approval Supporting Document Page 8 of 82 1.3 Proponent Santos WA is the proponent for the VICPOP. Contact details for the proponent are as follows: Gareth Bamford Production Offshore Manager Gas Assets Santos Limited, Level 7, 100 St Georges Tce, Perth WA 6000 Ph: 6218 7139 Email: [email protected] 1.4 Premises Description VI is a prescribed premises under Part V of the EP Act and operates in accordance with a licence (L6284/192/10) for particular categories. The characteristics of the existing facilities on VI are summarised in Table 1-1 and the additional characteristics of the VICPOP, are summarised within Table 1-2. Table 1-1: Characteristics of Existing Varanus Island Facilities Existing Element Description No change to the existing offshore supply pipeline from the Offshore gas supply pipeline JB platform. Oil and gas production Prescribed Premises Category 10 – Oil or gas production from wells: premises, whether on land or offshore, on which crude No change to the existing combined quantity of quantities of oil, natural gas or condensate is extracted oil, gas and/or condensate produced (≤ 7,050,000 tonnes per from below the surface of the land or annual period). Changes to the production method are as seabed, as the case requires, and is treated presented in Table 1-2. or separated to produce stabilized crude oil, purified natural gas or liquefied hydrocarbon gases. Oil or gas refining No change to the existing combined quantity of quantities of Prescribed Premises Category 34 – Oil or oil, gas and/or condensate produced (≤ 7,050,000 tonnes per gas refining: premises on which crude oil, annual period). Changes to the production method are as condensate or gas is refined or processed. presented in Table 1-2. Condensate storage No change to the existing crude oil and condensate storage of 120,000 cubic meters and no change to existing export Prescribed Premises Category 73 facilities or throughputs. Petroleum processing operations No change to existing as 24 hours a day, 365 days a year. No additional manning required over and above current Operational manning manning levels. No additional sales gas production over and above current Sales gas production volumes as produced on VI and supplied into the DBNGP. No additional condensate production over and above current Condensate production volumes produced on VI. Produced Formation Water (PFW) volumes No change to the existing PFW production throughput. PFW treatment and disposal No change to the existing PFW treatment and disposal Santos Ltd | Varanus Island Compression and Power Optimisation Project – Works Approval Supporting Document Page 9 of 82 Existing Element Description systems. Sewage treatment facility. Prescribed Premises Category 85 – Sewage facility: premises – No change to the existing sewage treatment facility or (a) On which sewage is treated (excluding throughputs being ≤ 54 cubic meters per day1.
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