2. Mangatawa catchment consents for earthworks, storm water ...

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NZ Transport Agency and Tauranga City Council Mangatawa Drain Flood Bypass and TEM Stormwater AEE In addition, the mitigation proposed to control the temporary effects of the earthworks on the environment, as well as the attenuation and treatment proposed to manage the effect of the stormwater, will be consistent with Objectives 10, 17 and 19. The Project will also provide for the beneficial effects of providing a key transportation corridor. Chapter 4.0 – Discharges to Water and Land Discharges of Contaminants or Water to Water, and Discharges of Contaminants to Land and 4.2 Discharge of Stormwater. Provisions relating to discharges to land and water are contained in the RWLP in Objectives 23, 26, 31, 32, 34 and Policies 38, 39, 42, 50, 51, 54, 56 and 57. The proposed stormwater management philosophy for the TEM is to maintain or enhance the quality of stormwater prior to its discharge to the local streams and rivers. Management of stormwater related to flooding and treatment were major concerns of surrounding landowners, hapu and most of the stakeholders during the consultation process. NZTA has undertaken to meet the ARC TP10 level of treatment for road way derived stormwater while mitigating the risk of flooding through attenuation of the stormwater created by the motorway. In this way, the Project addresses the concerns of the submitters and affected parties in the Project. The Mangatawa catchment is predominantly rural and the runoff from this land is likely to contain typical rural nutrients and contaminants. Treatment of this runoff is not part of this project and will continue as it does currently as the land management practices of this catchment are beyond this projects ability to practically control. With regard to the accidental spillage of hazardous substances during TEM construction, this will be managed through the Environmental Safety Plan which will show what measures will be taken to protect the environment from accidental spills. It is intended that these measures will be in place before construction located appropriately. Chapter 6.0 - Beds of Rivers, Streams, Lakes and Wetlands Activities in the Beds of Rivers, Lakes and Streams Objectives 55, 57, 58, 59, 73, 74 and Policies 98 to 102, 133, 134 of the RWLP relate to the beds of rivers, streams, lakes and wetlands. The construction works required in the Upper Mangatawa Drain will have a temporary effect on the ecological value of the drain. These works require the drain bed to be lowered through excavation; coffer dams to protect the placement of gabion baskets and reno mattresses; and protection of the flow path from the construction of the strengthening embankment at the rail bridge. The works will only affect the ecological value of the stream for short periods if managed appropriately. The principals of the philosophy to mitigate these effects are laid down in the example Erosion and Sediment Control Plan in Appendix 13. The drain itself is a highly mobile environment with a sandy bottom and the flora and fauna found in this drain will be well used to high levels of sediments from high rain fall events. Status: Final Page 101 April 2009 Project Number: 3932036 NZ1-1552092-Mangatawa Drain Flood Bypass and TEM Stormwater AEE
NZ Transport Agency and Tauranga City Council Mangatawa Drain Flood Bypass and TEM Stormwater AEE However the fundamental approach for controlling the effects of sedimentation will be to restrict the duration of works in the drain to an absolute minimum as to avoid fish spawning and migration periods and reduce the impacts of sediment in the drain. The re-vegetation of the Mangatawa Drain will help to preserve the preserve the ecological values of the receiving drains and rivers and flora and fauna of this drain should be able to establish quickly after construction has been completed. 10.4 Bay of Plenty Regional Air Plan The discharge of dust from the site is to meet the permitted activity provisions of Rule 17(e). 10.5 Regional Coastal Environment Plan Coastal July 2003 Tauranga Harbour and surrounding lands form the traditional rohe of Ngaiterangi Iwi known as “Mai i nga Kuri a Wharei ki Wairakei.” Hapu of Ngaiterangi maintains strong local communities which are dependent on maintenance of the life-supporting capacity of the harbour and surrounding land. Maintenance of kaimoana and coastal water quality is particularly important. Tauranga Moana is rich in cultural heritage sites for Ngaiterangi and other iwi. Many of the sites are of significance to Ngaiterangi te Iwi, while others are significant to specific hapu. In addition to the harbour itself the following places have particular significance for Ngaiterangi: • Te Tahuna o Rangataua (Rangataua Bay) There are no rules pertaining to storm water discharge into an ecological area, however Rule 9.2.4(a) of the Regional Coastal Plan applies. The discharge into the CMA will be a permitted activity subject to the following conditions. If these conditions can not be met the discharge becomes a discretionary activity. 9.2.4(a) The discharge of stormwater to the coastal marine area is a permitted activity provided that: • the suspended solids concentration of the water discharged does not exceed 150 g.m-3; and • the water discharged is substantially free of grease, oil, scums and foam; and • the maximum discharge does not exceed 80 litres per second for a 20% AEP storm event (5 year return period storm). 9.2.4(b) Except as expressly provided for or prohibited by other rules to this plan, any discharge is a discretionary activity. Status: Final Page 102 April 2009 Project Number: 3932036 NZ1-1552092-Mangatawa Drain Flood Bypass and TEM Stormwater AEE
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Mangatawa Drain Flood Bypass and TE
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APPENDIX 7 - Archaeological Assessm
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ARCHAEOLOGY B.O.P. HERITAGE CONSULT
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2 INTRODUCTION Project Background T
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4 ARCHAEOLOGICAL LANDSCAPE Previous
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6 U14/1708 & 1709 Figure 3. Cadastr
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8 Figure 6. Part ML 8133 showing Pt
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10 Hungahunga & Toroa A further ton
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12 APRIL 2008 ARCHAEOLOGICAL SURVEY
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14 Historic Places Act In addition
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APPENDIX 8 - Hydraulic Modelling: M
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Hydraulic Modelling: Mangatawa Drai
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undertake investigations into the d
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Discharge to Papamoa Beach To disch
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• Riparian planting adjacent to t
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2.2 Hydrological Assessment 2.2.1 C
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The Maranui catchment area in the m
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Table 7 - 2% AEP Storm Event Top Sp
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These results include climate chang
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3.3 Maintenance Work in Mangatawa D
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stormwater from the Maranui catchme
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Appendix A Mangatawa Drain Layout P
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Appendix C Runoff Hydrographs
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Appendix E Proposed Lower Mangatawa
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APPENDIX 10 - Drawings 3932036 ck46
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APPENDIX 12 - Drawing 3932036 ck227
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Report Tauranga Eastern Motorway -
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1 Introduction This report describe
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embankment settlement rates, and th
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3.2 Construction Sequence The typic
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concrete contamination as well as s
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Pahse 1 consists of the western sec
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• Installation of Stage 2 decanti
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Appendix A Erosion and Sediment Con
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Activity Status Mangatawa Drain 1.1
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(b) Natural State (River) Water Qua
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6. Reclamation or drainage of the b
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APPENDIX 15 - Legal Descriptions of
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Path: P:\393\3932036\TGI\55_Project
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32 Harington Street PO Box 903, Tau
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32 Harington Street PO Box 903, Tau
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