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NZ Transport Agency and Tauranga City Council Mangatawa Drain Flood Bypass and TEM Stormwater AEE c) Herpetofauna The availability of native reptile habitat was visually assessed within the Special Ecological Site 13 (SES, Tauranga District Plan) on 28 November 2008. The SES consisted of saltmarsh and mangrove, and was considered unsuitable for native lizards. d) Water Quality The water quality being discharged from the stormwater treatment wetland through the special ecological site was generally characterised by elevated levels of some nutrients and bacteria. Elevated concentrations of the total nitrogen, nitrate and total phosphorus were recorded downstream of the stormwater treatment wetland, within the special ecological site (Site W1a), and were in excess of the ANZECC (2000) upper guideline limits. As the inorganic nitrogen and phosphorus species tested were below the relevant guidelines levels, with the exception of nitrate, it is likely that the majority of nutrients present in the system are in an organic form, and are therefore less readily assimilated by macrophytes. High bacterial counts recorded at the outlet from the stormwater treatment wetland (Site W1a) were in excess of the guideline levels for contact recreation in freshwaters (MfE, 2002). No specific guidelines have been established for bacteria in relation to the protection of aquatic life and it is accepted that this waterway is unlikely to be used for contact recreation. The number of Escherichia coli at the outlet from the stormwater treatment wetland (Site W1a) exceeded the lower MfE (2002) guideline, which indicates faecal contamination. Farm runoff is one possible source of contamination within these waterways, given the historical farming landuse of the area surrounding Maranui. Table 7: Sampling Site Locations Status: Final Page 57 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 e) Aquatic Fauna Aquatic fauna (macroinvertebrates & fish) within the special ecological site were limited to seven macroinvertebrate taxa, four native fish and one introduced fish. No rare or threatened species were recorded. The macroinvertebrate community was dominated by the common freshwater snail (Potamopyrgus antipodarum) and the estuarine amphipod (Melita awa), which are considered tolerant of degraded habitat quality. No taxa from the generally sensitive EPT group of insects were recorded. The MCI score was 88 and indicative of ‘fair’ instream conditions (Stark & Maxted, 2004). 5.13.5 Rangataua Bay Rangataua Bay, located in the upper southern arm of Tauranga Harbour, receives stormwater from the stormwater management area (treatment pond) and the Mangatawa drain. The sediments at the mouth of the Mangatawa drain are relatively coarse grained sands with a small component of silts and clays. The intertidal flats supported a sparse population low mangrove plants, the pneumatophores of which supported the barnacle Chaemosipho columna . A sparse population of burrowing mudcrabs (Helice crassa) and occasional mudsnails (Amphibola crenata), turret shell (Zeacumantus lutulentus), topshell (Diloma sp) and whelks (Cominella sp.) were recorded in the coarse sands. Burrows in the sand indicated the presence of populations of estuarine worms and amphipods, however, no populations of edible shellfish such as cockles or pipis were found in this area of the Bay. Several small patches of the alga Ulva luctuca were observed on the intertidal sands. Four sediment quality samples were collected and were analysed for metallic, persistent organic and nutrient concentrations. The results of these analyses are presented as Table 8. Table 8: Results of Rangataua Bay Sediment Quality Analyses A suite of metals and metalloids were analysed for in the Rangataua Bay sediments and all of these parameters were detected in low concentrations in the sediments, well below the respective ANZECC interim sediment quality guidelines. Status: Final Page 58 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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APPENDIX 1 - Drawing 3932036 ck301R
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APPENDIX 3 - Drawing 3932036 ck119
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APPENDIX 5 - Bioresearches Report:
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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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