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TONGARIRO POWER SCHEME ENVIRONMENTAL REPORT // 01.07.12 30.06.13 ENVIRONMENTAL 13 Technical Reports Ordiscuss Matters Directly Withinterested Parties

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TONGARIRO POWER SCHEME ENVIRONMENTAL REPORT // 01.07.12 30.06.13 ENVIRONMENTAL 13 Technical Reports Ordiscuss Matters Directly Withinterested Parties TONGARIRO POWER SCHEME ENVIRONMENTAL REPORT // 01.07.12 30.06.13 ENVIRONMENTAL This report provides a summary of key environmental outcomes developed through the process to renew resource consents for the ongoing operation of the Tongariro Power Scheme. The process to renew resource consents was lengthy and complicated, with a vast amount of technical information collected. It is not the intention of this report to reproduce or replicate this information in any way, rather it summarises the key outcomes for the operating period 1 July 2012 to 30 June 2013 (referred to hereafter as ‘the reporting period’). The report also provides a summary of key result areas. There are a number of technical reports, research programmes, environmental initiatives and agreements that have fed into this report. As stated above, it is not the intention of this report to reproduce or replicate this information, rather to provide a summary of it. Genesis Energy is happy to provide further details or technical reports or discuss matters directly with interested parties. 13 HIGHLIGHTS 1 July 2012 to 30 June 2013 02 01 INTRODUCTION 02 1.1 Document Overview Te Maari Eruption Mount Tongariro erupted at the Te Maari Crater erupted on 02 1.2 Resource Consents Process Overview the 6 August and 21 November 2012. Both events posed a significant risk to 02 1.3 How to use this document the Tongariro Power Scheme (TPS) structures. During the August eruption, 02 1.4 Genesis Energy’s Approach which occurred at night, the Rangipo Power Station and Poutu Canal were to Environmental Management closed. The following day a field team went out on site to monitor the tributaries water quality on the TPS. Once it was determined that there was 02 1.4.1 Genesis Energy’s Values no discernable effect on water quality, the Rangipo Power Station and Poutu 03 1.4.2 Environmental Management System Canal were reinstated. The November eruption had less of an impact on the 03 1.4.3 Resource Consents Management System surrounding environment other than to eject a lot of ash into the atmosphere. 03 1.4.4 Hydrology Genesis Energy monitored potential effects on the scheme and determined 03 1.5 Feedback that it was not necessary to stop generation (see Section 7.4). 04 02 TONGARIRO POWER SCHEME Tuna Management Genesis Energy engaged members of Te Runanganui o 05 2.1 Operating the Tongariro Power Scheme Ngati Hikairo ki Tongariro to monitor and salvage tuna stranded at the Wairehu 05 2.2 Climate and Power Generation Drum Screens. Valuable data on the timing and scale of tuna standings was 06 03 EASTERN DIVERSION collected and a total of 29 stranded tuna were recovered, tagged, checked and transferred safely to the Whanganui River headwaters, downstream of TPS 07 3.1 Wahianoa Aqueduct structures. The number of local tuna fishers using the Wairehu site ceased 07 3.1.1 Hydrology during the autumn migration period which has greatly reduced public health 07 3.1.2 Aquatic Ecosystems and Water Quality and safety issues at the site, an outcome directly attributable to the advocacy 07 3.1.3 Ngati Rangi work of the hapu-based tuna team (see Section 6.1.3). 08 3.1.4 Mangaio Power Station 08 3.2 Lake Moawhango Rotoaira Dredging The Rotoaira Channel was dredged to maintain the flow 08 3.2.1 Hydrology capacity of the Channel for the TPS. Over a five month period, 2.7 kms of the channel was dredged using a slow-moving cutter suction dredge, with 08 3.2.2 Sediment (Erosion, Transport and Deposition) the dredged material piped to a disposal site. Resource consent conditions 09 3.3 Moawhango River required that the turbidity of the water in the Rotoaira Channel be monitored 09 3.3.1 Hydrology and the Lake Rotoaira Trust worked together with Genesis Energy and Heron 12 3.3.2 Aquatic Ecosystems and Water Quality Construction to undertake this monitoring work. At the completion of the 13 3.3.3 Natural Character and Amenity Issues project, 105,000 m3 of sediment had been dredged from the Channel (see 13 3.3.4 Recreation/Tourism Section 6.1.5). 14 3.3.5 Ngati Whitikaupeka, Ngati Tamakopiri and Ngati Hauiti Moawhango Flushing New concerns were raised about the effects of the 14 3.3.6 Moawhango Community Moawhango flushing flows on the Rangitikei River. In response to these 16 04 TONGARIRO RIVER concerns, Genesis Energy viewed the impacts of the March 2013 flushing flow 17 4.1 Hydrology on the Rangitikei River with a number of residents and held a public meeting 19 4.2 Aquatic Ecosystems and Water Quality to discuss the issue. Residents were unanimous in wanting to find a solution that doesn’t detract from the benefits to the Moawhango River but helps to 21 4.3 Sediment (Erosion, Transport and Deposition) address the issues on the Rangitikei River. A number of possible ways forward 22 4.4 Recreation and Tourism from the meeting will be assessed over the coming months (see Section 3.3.6). 23 05 WESTERN DIVERSION 25 5.1 Hydrology Whio Forever A record number of whio chicks were recorded for the Tongariro Forest Whio Programme (including Whanganui, Mangatepopo 26 5.2 Aquatic Ecosystems and Water Quality and Whakapapa Rivers) with 199 ducklings hatched. Whio Security Site 27 5.2.1 Whanganui River Enhancement Trust managers (including Tongariro Forest) now expect to achieve their target 28 5.3 Recreation and Tourism numbers of protected whio pairs earlier than anticipated (i.e. the target 28 5.3.1 Recreational Releases of 400 in total will be achieved by 2016, rather than 2019) as a result of 28 5.3.2 Recreational Initiatives the Genesis Energy National Whio Recovery Plan and mitigation work 28 5.3.3 Whanganui Iwi focused on whio enhancement (see Section 8.1 for details and Table 15). 29 06 LAKE ROTOAIRA/LAKE TAUPO 30 6.1 Lake Rotoaira ABBREVIATIONS 30 6.1.1 Hydrology AER Annual Environmental Report 30 6.1.2 Aquatic Ecosystems and Water Quality AFDM Ash-free dry mass 31 6.1.3 Tuna Management BoPRC Bay of Plenty Regional Council 31 6.1.4 Lake Rotoaira Trust CDMP Construction Debris Management Plan 32 6.1.5 Dredging of the Rotoaira Channel CSR Comprehensive Safety Review 32 6.2 Tokaanu Stream DOC Department of Conservation ECNZ Electricity Corporation of New Zealand 33 6.3 Tokaanu Tailrace and Lake Taupo EMS Environmental Management System 33 6.3.1 Hydrology Maximum Levels EPT Ephemeroptera, Plecoptera, and Trichoptera (the three insect 33 6.3.2 Aquatic Ecosystems and Water Quality orders commonly used to test water quality) 34 07 SCHEME-WIDE OUTCOMES ERLAWS Eastern Ruapehu Lahar Alarm and Warning System FNU Formazin Nephelometric Units 35 7.1 Ngati Tuwharetoa - Genesis Energy Committee GWh Gigawatt hour 35 7.2 Central North Island Blue Duck Conservation Trust IBI Index of Biological Integrity 35 7.3 Publicly Available Hydrology Information LRFT Lake Rotoaira Forest Trust 35 7.4 Volcanic Activity Management Plan (VAMP) masl meters above sea level – Moturiki Datum 38 7.5 Maintenance Activities MAF Ministry of Agriculture and Forestry 39 7.6 Run-off Management Plan MCI Macro-invertebrate Community Index MfE Ministry for the Environment 39 7.7 Dam Safety MVA Megavolt Ampere 40 7.8 Oil Spill Response MW Megawatt 40 7.9 Public Complaints MWRC Manawatu Wanganui Regional Council 40 7.10 Waikato Regional Council Audit NIWA National Institute of Water and Atmospheric Research NZDF New Zealand Defence Force 41 08 COMMUNITY & ENVIRONMENTAL INITIATIVES NZTA New Zealand Transport Agency 42 8.1 Whio Forever OPC Sir Edmund Hillary Outdoor Pursuits Centre 42 8.1.1 Sponsorship for Lower Tongariro Community Blue Duck Project QMCI Quantitative Macro-invertebrate Community Index 43 8.2 Tongariro National Trout Centre RCMS Resource Consent Management System 44 8.3 Tongariro River Trial RDC Ruapehu District Council 44 8.4 Sir Edmund Hillary Outdoor Pursuits Centre Sponsorship RMA Resource Management Act (1991) SHMAK Stream Health Monitoring Assessment Kit 45 8.5 Aquatic Biosecurity TDC Taupo District Council 45 8.6 Turangi Community Health Centre TFEF Tongariro Fishery Enhancement Fund 46 8.7 Genesis Energy Turangi Aquatic Centre TPS Tongariro Power Scheme 46 8.8 Turangi Public Library - Summer Reading Programme TRMP Tongariro River Monitoring Plan 46 8.9 Te Whare Waka - Tokaanu Water Sports Centre TSMG Tokaanu Stream Management Group 46 8.10 John Ball Films - History of the Tongariro Power Development VAMP Volcanic Activity Management Plan WDC Wanganui District Council 47 09 KEY OBJECTIVES 2010-11 REVIEW WRC Waikato Regional Council 48 9.1 Review of Key Objectives for 2012-2013 WHIONE Whio Operation Nest Egg 49 9.2 Key Objectives 2013-2014 WRET Whanganui River Enhancement Trust 50 10 REFERENCES Cover photo: Tokaanu Power Station was commissioned 1973. Back Cover photo: Rangipo Power Station Construction of the Power House. Rangipo Power Station was commissioned in 1983, 30 years ago this year. 01 INTRODUCTION New Zealand Limited (ECNZ) and then Genesis Energy to develop comprehensive consultation processes, to define issues, to identify Nau mai haere mai ki tenei Ripoata Taiao e pa ana ki te mahi how these issues should be investigated and, in most cases, to hihiko mo tenei rohe o Tongariro. agree on outcomes to address these issues. Welcome to the 2012-2013 Annual Environmental Report (AER) The extensive programme of consultation and research has led for the Tongariro Power Scheme (TPS). The purpose of this report to a comprehensive suite of resource consents that authorise the is to update communities and stakeholders on the wide range continued operation of the TPS.
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