10. Emission Sources, Pathways, Receptors and Controls
10.3 Receptors
10.3.1 Public drinking water source areas
The closest Public Drinking Water Source Areas are each over 100 km away from the proposed Prescribed Premises boundary and include:
• SE - Menzies Water Reserve & 3 x Wellhead Protection Zone (CAWS Act)
• E - Leonora Water Reserve & multiple Wellhead Protection Zone (CAWS Act)
• N - Sandstone Water Reserve Wellhead Protection Zone (CAWS Act).
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Dust and noise are carried through the air but with a short construction duration, low volumes noise, no night works and no sensitive receptors, there is little potential for impact.
Commissioning and operation of the WWTP and irrigation spray field has potential for equipment or infrastructure failure that may cause a leak or discharge to the ground. There is no watercourse, wetland or sensitive surface receptor in the vicinity. The groundwater is at depth and therefore with the handled volumes of wastewater, low likelihood of potential impact.
11.1.2 Management & Controls
The following management and controls will ensure low risk to the environment through clearing, construction, commissioning and operation:
• Small clearing area clearly demarcated with authorisation by Environmental Superintendent to proceed; clearing delayed if high wind conditions cause excessive dust generation
• Construction according to contract and works approval specifications
• Commissioning according to Environmental Commissioning Plan (Attachment 3A)
• Operation according to contract specification and manufacturer’s instructions
• Operation and maintenance according to specifications that include continuous monitoring and live alarm system
• Irrigation sprayfield to be fenced with stock proof fencing and signposted with warning signs for Authorised Entry only
• Spill kits with infrastructure; spill reporting procedure.
WWTP & Sprayfield Operation
In the event of spills from either facility, the first priority will be to isolate the system and stop the release of wastewater. Contaminated soil will then be removed and disposed to an appropriately licensed landfill facility. An investigation and necessary works (e.g. repairs, upgraded capacity, etc.) will be undertaken to prevent further incidents.
11.1.3 Rating of this risk event
All phases (Construction, Commissioning and Operation) will have similar impacts, management and controls. Mt Ida Gold Project is remote with limited environmentally sensitive areas/sensitive receptors. Aurenne considers that with the existing and proposed management controls, the residual environmental risks associated with the prescribed activities are acceptable.
The overall risk rating is low given the proposed activities to construct and operate the WWTP and sprayfield, and the management and control measures proposed.
11.2 Conclusion
Based on the risk assessment and the management/controls developed to address the activities with potential to impact the environment, it is considered that a Works Approvals can be granted for the application activities.
A post-construction and commissioning period is requested in the works approval to commence at the conclusion of the independent components of construction works.
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13. References
AS/NZS 1547:2012 On-site domestic wastewater management.
Bureau of Meteorology 2021 Climate Data Online Accessed:
http://www.bom.gov.au/climate/data/stations; accessed at http://www.bom.gov.au/
Cowan, MA, 2001, Murchison 1 (MUR1 – East Murchison subregion). In NL McKenzie & JE May (eds.), A Biodiversity Audit of Western Australia’s 53 Biogeographical Subregions in 2002 (pp.466- 479). Western Australia: Department of Conservation and Land Management.
Curry, PJ, Payne, AL, Leighton, KA, Hennig, P and Blood, DA, 1994, Technical Bulletin No. 84 An inventory and condition survey of the Murchison River catchment and surrounds, Western Australia.
Department of Agriculture, Perth. Department of Environment Regulation (DER), February 2017 Guidance Statement: Risk Assessments. DER, Perth, accessed at www.dwer.wa.gov.au
Department of Environment Regulation (DER), 2016, Environmental Siting Part V, Division 3, Environmental Protection Act 1986. State of Western Australia. Accessed:
https://www.der.wa.gov.au/images/documents/our-work/licences-and-works-approvals/GS- Environmental-Siting.pdf
DER, October 2015. Guidance Statement: Setting conditions. Department of Environment Regulation, Perth.
DER, February 2017. Guidance Statement: Risk Assessments. Department of Environment Regulation, Perth.
Department of Health, 2011, Guidelines for the Non-potable Uses of Recycled Water in Western Australia. Department of Health, Perth.
Department of Health, 2016, Recycled Water Sampling Technique. Department of Health, Perth.
DER, July 2015. Guidance Statement: Regulatory principles. Department of Environment Regulation, Perth
Department of Water (DoW), 2008, Water Quality Protection Note 22: Irrigation with nutrient-rich wastewater. Department of Water, Perth. Accessed:
https://www.water.wa.gov.au/ data/assets/pdf file/0013/4045/82324.pdf
DoW, 2009, Water Quality Protection Note 111 Landfills for Disposal of Putrescible Materials Department of Water, Perth. Accessed:
https://www.water.wa.gov.au/ data/assets/pdf file/0015/4056/84596.pdf
Department of Water and Environmental Regulation (DWER), 2019a, GWL63902(6) Licence to Take Water, granted by the Minister under section 5C of the Rights in Water and Irrigation Act 1914.
DWER, 2019, Environmentally Sensitive Areas map. Accessed: https://cps.dwer.wa.gov.au/main DWER, 2019, Landfill Waste Classification and Waste Definitions 1996 (as amended 2019). Accessed:
https://www.der.wa.gov.au/images/media/Media statements/Waste definitions.pdf
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ATTACHMENT 1 A PROOF OF OCCUPIER
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ATTACHMENT 1B COMPANY EXTRACT
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ATTACHMENT 2 PREMISES MAP
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ATTACHMENT 3A ENVIRONMENTAL COMMISSIONING PLAN
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ATTACHMENT 3B ADDITIONAL INFORMATION
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ATTACHMENT 3C PRESCRIBED PREMISES BOUNDARY SPATIAL FILES
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ATTACHMENT 4 NA
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ATTACHMENT 5 RELATED APPROVALS
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ATTACHMENT 6 EMMISSIONS & DISCHARGES
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ATTACHMENT 7 SITING
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ATTACHMENT 8 SUPPORTING INFORMATION