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 9.2 Earthworks The Earthworks for the construction of the TEM embankment and associated swales has been assessed and considered at a hearing finishing on December 18th 2008. This application will address the earthwork effects related to the construction of the Mangatawa Catchment Stormwater management. The total volume of earthworks required to be undertaken is approximately between 45,000m³ - 60,000m³. NOTE: This excludes the works which will be subject to a separate resource consent application. The effects of earthworks and construction can result in increased, erosion, sedimentation, nutrient levels in riparian margins and waterways as well as more human effects such as increased noise, dust and vibration. This can have an adverse have an adverse effect on ecological values, cultural values, natural character and landscapes. 9.2.1 Ecological Effects from Construction For this proposal there is a potential temporary adverse effect on the ecology of the freshwater habitats in the downstream receiving environments, through sediment inputs from construction and maintenance operations. During construction the main activities with the potential to generate harmful ecological impacts are: 1. Works in the bed of the upper Mangatawa Drain 2. Construction of the stormwater treatment wetland 3. Construction of the earth stopbank on the Lower Mangatawa Drain NZTA and TCC will seek to manage and mitigate these effects through establishing environmental bottom lines in its contract documents with the contractor. It is recognised that the upper and lower drain has significant importance to the local community. The use of the drain to eel and catch white bait was raised during consultation and to support this activity works in the bed of the stream will be undertaken outside fish spawning periods to lessen the impacts of this disturbance. Works to improve and stabilise the drain alignment past the railway bridge, using gabion baskets and reno mattresses, will be undertaken as quickly as possible to minimise disturbance. The banks of the drain will be re-established and planted as soon as is practicable after the activity takes place and it is proposed that any complaints and or issues that the community may have be dealt with quickly and directly with the contractor through a complaints phone line set up for this project. The result of these mitigation measures will mean that the effects of this activity will be no more than minor. The construction of the stormwater treatment wetland will take place next to the SES as described in the project description. Using a Construction Management Plan (CMP) as defined below will address many of the issues related to earthworks for this and other earthworks activity. Status: Final Page 89 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 An overarching CMP will identify the effects of this work, how the contractor will avoid, remedy or mitigate the effects including compliance with the Outline Plan, Resource Consent conditions and Designation conditions. The Construction Management Plan (CMP) includes the preparation of an Erosion and Sediment Control Plan (ESCP) which will cover how erosion and sedimentation will be managed and mitigated, as well as including stormwater management techniques. The ESCP will comply with the guidelines set out in the EBOP Erosion and Sediment Control Guidelines for Land Disturbing Activities (September 2001). An example Erosion and Sediment Control Plan is provided in Appendix 13. This will be developed by the Contractor for approval of EBOP before works can commence on site. The inputs shall as a minimum include the following: • Locality map; • Site plan showing the extent of earthworks, type and location of erosion and sediment controls and off site sources of runoff; • The design for erosion and sediment control ( in accordance with the EBOP Erosion and Sediment Control Guidelines for Land Disturbing Activities (September 2001); • Engineering drawings and specifications; • Details of stabilisation measures; • Contingency plans; • Construction schedule; and • Monitoring and maintenance schedules. With regards to herpetofauna, habitats surrounding the wetland were not surveyed, but it is likely that copper skinks will be present in areas of scrub vegetation and rank grasses. It is considered unlikely that skinks or other native reptile species will be present within grazed pasture or other areas consisting of short grasses. The habitats in which the earthworks will be undertaken predominantly comprise grazed and cropped farmland that contain no vegetation and flora, wildlife, copper skinks around wetland and amphibians of note, these earthworks will have a less than minor effect on the terrestrial habitats of the area. Status: Final Page 90 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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NZ Transport Agency and Tauranga Ci
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Page 46 and 47: NZ Transport Agency and Tauranga Ci
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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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