Decision Report
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Decision Report Application for Works Approval Division 3, Part V Environmental Protection Act 1986 Works Approval Number W6225/2019/1 Applicant Shire of Ashburton File Number DWERVT1867 Premises Pilbara Regional Waste Management Facility Lot 550 and Lot 551 on Plan 414367, being Reserve 53324 Onslow Road TALANDJI WA 6710 Certificate of Title: Volume LR3169, Folio 963 Date of Report 18 October 2019 Status of Report Final Works Approval: W6225/2019/1 IR-T04 Decision Report Template v2.0 (July 2017) i Table of Contents 1. Definitions of terms and acronyms ................................................................... 1 2. Purpose and scope of assessment ................................................................... 6 2.1 Exclusions from scope ....................................................................................... 7 3. Overview of Premises......................................................................................... 7 3.1 Construction summary ....................................................................................... 7 3.2 Operations summary ........................................................................................ 10 3.3 General construction and operation specifications ...................................... 10 4. Legislative context............................................................................................ 16 4.1 Conservation and Land Management Act 1984 ............................................. 18 4.2 Land Administration Act 1997 ......................................................................... 18 4.3 Mining Act 1978 ................................................................................................ 18 5. Location and siting ........................................................................................... 19 5.1 Siting context .................................................................................................... 19 5.2 Residential and sensitive receptors ................................................................ 19 5.3 Specified ecosystems and ecological receptors ........................................... 20 5.4 Climate ............................................................................................................... 23 Rainfall and temperature ................................................................................... 23 Wind direction and strength .............................................................................. 23 5.5 Topography and soils ....................................................................................... 24 5.6 Hydrology .......................................................................................................... 25 5.7 Hydrogeology .................................................................................................... 25 6. Landfill engineering and design ...................................................................... 29 6.1 Landfill liner system and performance ........................................................... 30 Landfill liner design ........................................................................................... 30 Landfill liner performance .................................................................................. 31 6.2 Separation distance to groundwater ............................................................... 33 6.3 Leachate extraction, collection and storage .................................................. 33 Leachate extraction and collection .................................................................... 33 Leachate ponds ................................................................................................ 33 6.4 Stability assessment ........................................................................................ 34 6.5 Capping system ................................................................................................ 37 6.6 Landfill gas infrastructure ................................................................................ 38 7. Facility operations and management .............................................................. 38 Works Approval: W6225/2019/1 IR-T04 Decision Report Template v2.0 (July 2017) ii 7.1 Waste acceptance and general site operations ............................................. 38 Waste acceptance ............................................................................................ 39 Landfill cover..................................................................................................... 40 7.2 Leachate management ..................................................................................... 40 7.3 Stormwater management ................................................................................. 40 7.4 Environmental Monitoring and Sampling ....................................................... 41 7.5 Fire management/Emergency Response Plan ............................................... 43 8. Consultation ...................................................................................................... 44 9. Risk assessment ............................................................................................... 45 9.1 Determination of emission, pathway and receptor ........................................ 45 9.2 Consequence and likelihood of risk events ................................................... 71 9.3 Acceptability and treatment of Risk Event ..................................................... 72 9.4 Risk Assessment – Leachate emissions ........................................................ 72 Hazard characterisation and impact .................................................................. 72 Criteria for assessment ..................................................................................... 74 Applicant controls ............................................................................................. 74 Key findings ...................................................................................................... 75 Consequence.................................................................................................... 75 Likelihood of Risk Event .................................................................................... 76 Overall rating of leachate emissions ................................................................. 77 Acceptability of risk event.................................................................................. 78 Regulatory controls for leachate emissions ....................................................... 78 9.5 Risk Assessment – Dust emissions ................................................................ 79 Hazard characterisation and impact .................................................................. 79 Criteria for assessment ..................................................................................... 80 Applicant controls ............................................................................................. 80 Key findings ...................................................................................................... 80 Consequence.................................................................................................... 81 Likelihood of Risk Event .................................................................................... 82 Overall rating of dust emissions ........................................................................ 83 Acceptability of risk event.................................................................................. 84 Regulatory controls for dust emissions.............................................................. 84 9.6 Risk Assessment – Odour emissions ............................................................. 84 Hazard characterisation and impact .................................................................. 84 Criteria for assessment ..................................................................................... 85 Applicant controls ............................................................................................. 85 Works Approval: W6225/2019/1 IR-T04 Decision Report Template v2.0 (July 2017) iii Key findings ...................................................................................................... 86 Consequence.................................................................................................... 86 Likelihood of Risk Event .................................................................................... 86 Overall rating of odour emissions ...................................................................... 87 Acceptability of risk event.................................................................................. 87 Regulatory controls for odour emissions ........................................................... 87 9.7 Risk Assessment – Noise emissions .............................................................. 87 Hazard characterisation and impact .................................................................. 87 Criteria for assessment ..................................................................................... 88 Applicant controls ............................................................................................. 88 Key findings ...................................................................................................... 88 Consequence...................................................................................................