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 A total of 22 Rainbow skinks were recorded from 12 sampling stations. Rainbow skinks were visually abundant. Six copper skinks were also recorded from five sampling stations at the SMA during the survey (Figure 3). Figure 3 Positions of Sampling Stations within the Stormwater Treatment Wetland Area Key: Yellow dots: No lizards present; Green dots: Rainbow skinks; Red dots: Copper skinks. d) Aquatic Fauna Aquatic fauna (macro invertebrates & fish) within the stormwater treatment wetland were limited to ten macroinvertebrate taxa and two native fish species; no rare or threatened species were recorded. The macroinvertebrate community was dominated by the common freshwater snail (Potamopyrgus antipodarum), which is tolerant of degraded habitat quality and no taxa from the generally sensitive EPT group of insects were recorded. The MCI score was 59 and indicative of ‘poor’ instream conditions (Stark & Maxted, 2004). 5.13.4 Special Ecological Site - Salt-marsh and Mangrove (SES) The salt-marsh–mangrove SES area extends southwards from the southern boundary of the stormwater pond block out to the rubble causeway of the sewage treatment ponds, and also extends eastwards about 250 m to where the large Mangatawa Drain discharges into Rangataua Bay. This point is also where seawater enters the SES. The SES is very low-lying, except for slightly elevated ridges of spoil along the sides of old drains (which tend to run parallel to the original northwest-southwest grain of this landform). The intertidal surface is sandy towards the land, but muddy in the mangrove–dominated zone seawards. Status: Final Page 55 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 a) Vegetation The salt-marsh occupies the landward half of this area, and mangrove the seaward half. There is a distinct gradation in the salt-marsh vegetation: a landward community of sea-rush and open sandy areas with patches of glasswort (Sarcocornia quinqueflora) and Samolus repens gives way seawards to a marsh dominated by jointed rush. Salt-marsh ribbonwood (Plagianthus divaricatus) is conspicuous as an emergent towards the western end of the searush zone, as youthful-looking bushes of c.1-1.5 m tall. Salt-marsh ribbonwood and sea-rush are also common along the foot of the rubble berms that define the western and southern edges of most of the SES. Native species of much less cover in the SES include Cotula coronopifolia, Triglochin striatum, Selliera radicans, Isolepis cernua, I. nodosa, Lobelia anceps, Juncus pallidus and Baumea juncea. The mangrove canopy is a nearly continuous one, and increases slightly in height seawards, reaching c.1.5 m high along the tidal inlet just inside the shore-parallel bund of the sewage ponds. Judging by the considerable amount of lichen on their branches, conditions are less than ideal for mangroves. The SES seems to have no especially noteworthy botanical features and an increase in the amount of treated stormwater discharged through it seems likely to result only in changes to the zonation of the dominant species only. b) Avifauna The SES is Site No.13 in Owen (1993), which is the source reference for the Tauranga District Plan. One pair of banded rail plus a juvenile were observed in that survey (1990) with Pukeko, NZ kingfisher, mallard and whitefaced heron. No fernbirds were reported and the habitat quality was described as moderate – stock damage; rubbish tip leachates; rats and feral cats common. Banded rail (Gallirallus philippensis assimilis; moho-pereru) is also considered to be sparse (i.e. at risk) on a national basis. In this survey fernbird was recorded in marsh ribbonwood – searush – jointed rush habitat adjacent to the access-track from the stormwater management area and adjacent to the Vector Gas pipeline route. Fernbirds were both seen and heard on either side of the access track. Fernbird calls were also played throughout the rushmarsh habitat but no further birds were located. Accessible areas of silt and sand substrate were inspected for banded rail foot-prints and recorded calls were played throughout both the rushmarsh and mangrove – dominated habitat; no footprints were found and no calls elicited. In the 1990 survey (Owen, 1993) a pair of banded rail had been observed in this area and four individuals were recorded in similar habitat near the end of Tip Lane together with fernbirds. The combination of rushmarsh habitat abutting low, dense mangroves would provide good potential habitat and it would be unusual if banded rail did not utilise the area at least on an intermittent basis. Other birds observed using the habitat were harrier, NZ kingfisher, pukeko (common throughout), welcome swallow and white-faced heron. In addition, five pied stilt and two grey reed herons were observed feeding on the intertidal flats around the channel edges and two paradise shelduck were observed resting on exposed intertidal sand. Overall the rushmarsh – mangrove habitat is a high value area for marshbirds and is presently in an undisturbed condition – the wetland vegetation has recovered following installation of the gas pipeline, and farm stock has been excluded. Status: Final Page 56 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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