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Wet Weather Wastewater Overflows in the Ōtākaro/Avon River, Ōpāwaho/Heathcote River, and the Ihutai/Avon- Heathcote Estuary

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Wet Weather Wastewater Overflows in the Ōtākaro/Avon River, Ōpāwaho/Heathcote River, and the Ihutai/Avon- Heathcote Estuary CCC Wet weather wastewater overflows Christchurch City Council 20-Oct-2017 Wet weather wastewater overflows in the Ōtākaro/Avon River, Ōpāwaho/Heathcote River, and the Ihutai/Avon- Heathcote Estuary Section 127 change to resource consent conditions of CRC092692 P:\605X\60507690\4. Tech work Area\4.5 Planning\change in conditions application\CCC wastewater s127 AEE v2.docx Revision 2 – 20-Oct-2017 Prepared for – Christchurch City Council – Co No.: N/A AECOM CCC Wet weather wastewater overflows Wet weather wastewater overflows in the Ōtākaro/Avon River, Ōpāwaho/Heathcote River, and the Ihutai/Avon-Heathcote Estuary – Section 127 change to resource consent conditions of CRC092692 Wet weather wastewater overflows in the Ōtākaro/Avon River, Ōpāwaho/Heathcote River, and the Ihutai/Avon-Heathcote Estuary Section 127 change to resource consent conditions of CRC092692 Client: Christchurch City Council Co No.: N/A Prepared by AECOM New Zealand Limited Level 2, 2 Hazeldean Road, Addington, Christchurch 8024, P O Box 710, Christchurch MC, Christchurch 8140, New Zealand T +64 3 966 6000 F +64 3 966 6001 www.aecom.com In association with Christchurch City Council 20-Oct-2017 Job No.: 60507690 AECOM in Australia and New Zealand is certified to ISO9001, ISO14001 AS/NZS4801 and OHSAS18001. © AECOM New Zealand Limited (AECOM). All rights reserved. AECOM has prepared this document for the sole use of the Client and for a specific purpose, each as expressly stated in the document. No other party should rely on this document without the prior written consent of AECOM. AECOM undertakes no duty, nor accepts any responsibility, to any third party who may rely upon or use this document. This document has been prepared based on the Client’s description of its requirements and AECOM’s experience, having regard to assumptions that AECOM can reasonably be expected to make in accordance with sound professional principles. AECOM may also have relied upon information provided by the Client and other third parties to prepare this document, some of which may not have been verified. Subject to the above conditions, this document may be transmitted, reproduced or disseminated only in its entirety. P:\605X\60507690\4. Tech work Area\4.5 Planning\change in conditions application\CCC wastewater s127 AEE v2.docx Revision 2 – 20-Oct-2017 Prepared for – Christchurch City Council – Co No.: N/A AECOM CCC Wet weather wastewater overflows Wet weather wastewater overflows in the Ōtākaro/Avon River, Ōpāwaho/Heathcote River, and the Ihutai/Avon-Heathcote Estuary – Section 127 change to resource consent conditions of CRC092692 Quality Information Wet weather wastewater overflows in the Ōtākaro/Avon River, Document Ōpāwaho/Heathcote River, and the Ihutai/Avon-Heathcote Estuary Ref 60507690 Date 20-Oct-2017 Prepared by Helen Lawrence Reviewed by Duncan Whyte Revision History Authorised Rev Revision Date Details Name/Position Signature 1 13/10/2017 Draft for client review Justine Bennett – Associate Director - Environment 2 20/10/2017 Final for lodgement Justine Bennett – Associate Director - Environment P:\605X\60507690\4. Tech work Area\4.5 Planning\change in conditions application\CCC wastewater s127 AEE v2.docx Revision 2 – 20-Oct-2017 Prepared for – Christchurch City Council – Co No.: N/A AECOM CCC Wet weather wastewater overflows Wet weather wastewater overflows in the Ōtākaro/Avon River, Ōpāwaho/Heathcote River, and the Ihutai/Avon-Heathcote Estuary – Section 127 change to resource consent conditions of CRC092692 Table of Contents 1.0 Introduction 1 1.1 Purpose of this report 1 1.2 Structure of this report 1 2.0 Background 2 2.1 Christchurch wastewater network 2 2.2 Hydraulic model 2 2.3 Relevant resource consents and compliance strategy agreement 2 2.4 Current status 3 3.0 Description of Proposed Activities 4 3.1 Condition amendments 4 3.2 Reasons for proposed changes 4 3.3 Overflow sites 4 3.4 Future works programme 5 4.0 Description of the Environment 6 4.1 Ōtākaro/Avon River 6 4.1.1 Hydrology 6 4.1.2 Recreational and amenity values 6 4.2 Ōpāwaho/Heathcote River 6 4.2.1 Hydrology 6 4.2.2 Recreational and amenity values 7 4.3 Ihutai/Avon-Heathcote Estuary 7 4.3.1 Hydrology 7 4.3.2 Recreational and amenity values 7 4.4 Water quality and ecological values 7 4.4.1 Ōtākaro/Avon River 8 4.4.2 Ōpāwaho/Heathcote River 8 4.4.3 Estuary Water Quality 9 4.5 Cultural values 9 5.0 Resource consent requirements 10 5.1 RMA Section 127 10 5.2 Previous submitters 11 6.0 Consultation 12 6.1 Environment Canterbury 12 6.2 Tangata Whenua 12 6.3 Compliance and Monitoring Liaison Group 12 7.0 Assessment of Effects on the Environment 13 7.1 Introduction 13 7.2 Effects on human health 13 7.3 Effects on freshwater quality 13 7.3.1 Event based loading 14 7.3.2 Annual contaminant loading 18 7.3.3 Summary of effects on water quality 19 7.4 Effects on ecology 19 7.5 Effects on amenity and recreational values 19 7.6 Effects on cultural values 19 8.0 Statutory Assessment 21 8.1 National Policy Statements 21 8.2 Canterbury Regional Policy Statement 21 8.3 Canterbury Land and Water Regional Plan 21 8.4 Christchurch District Plan 22 8.5 Mahaanui Iwi Management Plan 22 8.6 Te Te Rūnanga o Ngāi Tahu Freshwater Policy Statement 23 8.7 Part 2 Assessment 23 8.8 Section 105 24 8.9 Section 107 24 P:\605X\60507690\4. Tech work Area\4.5 Planning\change in conditions application\CCC wastewater s127 AEE v2.docx Revision 2 – 20-Oct-2017 Prepared for – Christchurch City Council – Co No.: N/A AECOM CCC Wet weather wastewater overflows Wet weather wastewater overflows in the Ōtākaro/Avon River, Ōpāwaho/Heathcote River, and the Ihutai/Avon-Heathcote Estuary – Section 127 change to resource consent conditions of CRC092692 9.0 Notification 25 10.0 References 26 Appendix A Existing resource consent CRC092692 and compliance strategy A Appendix B Overflow sites description B Appendix C Cultural Impact Assessment D P:\605X\60507690\4. Tech work Area\4.5 Planning\change in conditions application\CCC wastewater s127 AEE v2.docx Revision 2 – 20-Oct-2017 Prepared for – Christchurch City Council – Co No.: N/A AECOM CCC Wet weather wastewater overflows 1 Wet weather wastewater overflows in the Ōtākaro/Avon River, Ōpāwaho/Heathcote River, and the Ihutai/Avon-Heathcote Estuary – Section 127 change to resource consent conditions of CRC092692 1.0 Introduction 1.1 Purpose of this report This Assessment of Effects on the Environment (AEE) supports an application under section 127 of the Resource Management Act 1991 (RMA) by Christchurch City Council (CCC, the applicant) for the change in conditions of resource consent CRC092692. Resource consent CRC092692 allows the CCC to discharge water and contaminants to water from overflow points in the Christchurch wastewater network as a result of wet weather events. This report sets out the proposed changes to CRC092692 and an assessment of the environmental effects of the changes. As the changes are an alteration to provide clarification on the meaning of an overflow event and to reflect network changes resulting from the Canterbury Earthquakes 2010 and 2011, the changes are considered within the scope of the original consent and can be considered under Section 127 of the RMA. This report addresses the resource consent requirements and satisfies Section 88 of the RMA. Section 88 requires that an application for resource consent includes, in accordance with Schedule 4, an AEE in such detail as corresponds with the scale and significance of the effects that the activity may have on the environment. In accordance with Section 127 of the RMA, only the effects of the change are considered. 1.2 Structure of this report The remainder of this report is set out in the following sections: Section 2: Background Section 3: Description on the activities Section 4: Description of the environment Section 5: Resource consent requirements Section 6: Consultation Section 7: Assessment of effects on the environment Section 8: Statutory assessment Section 9: Notification assessment The following information is appended to this report: Appendix A – Existing consent and compliance strategy Appendix B – Overflow sites description Appendix C – Cultural Impact Assessment P:\605X\60507690\4. Tech work Area\4.5 Planning\change in conditions application\CCC wastewater s127 AEE v2.docx Revision 2 – 20-Oct-2017 Prepared for – Christchurch City Council – Co No.: N/A AECOM CCC Wet weather wastewater overflows 2 Wet weather wastewater overflows in the Ōtākaro/Avon River, Ōpāwaho/Heathcote River, and the Ihutai/Avon-Heathcote Estuary – Section 127 change to resource consent conditions of CRC092692 2.0 Background 2.1 Christchurch wastewater network Christchurch’s wastewater is managed through a network of over 2,600 km of public wastewater pipes, 30,817 manholes and over 140 pump stations which all convey wastewater from homes and businesses to the Christchurch Wastewater Treatment Plant in Bromley. Pumping is required due to the flat ground the city is built on. From the treatment plant wastewater is discharged to the Pacific Ocean via the ocean outfall 3 km off South New Brighton. Wastewater predominantly consists of water and the remaining small portion is a range of debris and inert materials, organic materials, nutrients, pathogens, oil, grease and compounds such as heavy metals and organic compounds. The concentration of contaminants in wastewater is variable and dependent of the source. Generally Christchurch’s wastewater by volume is approximately 30% infiltration from stormwater and groundwater, approximately 60% domestic wastewater and the remainder is from commercial/industrial sites. The system has over 120 constructed overflow points which are in place to ensure that when there is a major disaster, or pump stations fail or the system is overloaded, normally during wet weather events, wastewater is managed to avoid discharges to roads and private land where public health risks are much higher.
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