SEAVIEW WWTP INTERMITTENT DISCHARGES Resource Consent Application and Assessment of Environmental Effects October 2017
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SEAVIEW WWTP INTERMITTENT DISCHARGES Resource consent application and Assessment of Environmental Effects October 2017 Resource consent application – October 2017 Document Control Document Information Document data Document ID Seaview WWTP Intermittent Discharges Resource Consent and AEE Document Owner Stewart McKenzie Issue Date 27 October 2017 Document History Version Issue Date Changes 1 5/10/17 Internal peer review 2 11/10/17 Client draft for review 3 22/10/17 Revised draft for client review 4 27/10/17 Final for lodgement Document Sign-Off Name Role Sign-off Date Richard Peterson Author 27 October 2017 David Cameron Author 27 October 2017 Stewart McKenzie Approver 27 October 2017 Resource consent application – October 2017 CONTENTS 1. Introduction ......................................................................................................................................... 1 1.1 Background and Context for the application .................................................................................. 1 2. Description of the activity ................................................................................................................... 2 2.1 The proposal .................................................................................................................................. 2 2.2 Value of the existing infrastructure ................................................................................................ 2 2.3 Activities for which resource consent is sought ............................................................................. 2 2.3.1 Discharge to the Waiwhetū Stream ........................................................................................ 3 2.3.2 Discharge to the Hutt River ..................................................................................................... 3 2.3.3 The new discharge structure ................................................................................................... 4 2.3.4 Deposition of rock rip rap ........................................................................................................ 4 2.3.5 Construction Methodology ...................................................................................................... 5 2.3.6 Disturbance of bed material .................................................................................................... 5 2.3.7 Diversion of water ................................................................................................................... 6 2.3.8 Occupation and use of the CMA ............................................................................................. 6 2.3.9 Summary of the Activities ....................................................................................................... 6 2.4 Ancillary activities .......................................................................................................................... 7 2.4.1 The outfall pipe extension ....................................................................................................... 7 2.4.2 Disturbance of contaminated soil ............................................................................................ 7 2.4.3 The storage tank ..................................................................................................................... 8 3. Site description ................................................................................................................................... 9 3.1 Waiwhetū Stream .......................................................................................................................... 9 3.1.1 Location .................................................................................................................................. 9 3.1.2 Māori Cultural Landscape ....................................................................................................... 9 3.1.3 Current Natural Character ..................................................................................................... 10 3.1.4 Stream Ecology ..................................................................................................................... 10 3.1.5 Hydrology .............................................................................................................................. 11 3.1.6 Saltmarsh Habitat ................................................................................................................. 11 3.1.7 Vegetation of Terrestrial Margins .......................................................................................... 12 3.1.8 Macroalgae ........................................................................................................................... 12 3.1.9 Sediments ............................................................................................................................. 12 3.1.10 Water Quality ........................................................................................................................ 13 3.1.11 Eutrophication ....................................................................................................................... 14 3.1.12 Sediment Contamination ....................................................................................................... 14 3.1.13 Shellfish Flesh Toxicity ......................................................................................................... 15 3.1.14 Benthic Invertebrate Community ........................................................................................... 15 3.1.15 Fish Community .................................................................................................................... 16 3.1.16 Recreation ............................................................................................................................ 16 3.1.17 Policy Statement and Plan Schedules applying to the site ................................................... 16 3.2 Hutt River ..................................................................................................................................... 17 Resource consent application – October 2017 3.2.1 Location ................................................................................................................................ 17 3.2.2 Māori Cultural Landscape ..................................................................................................... 17 3.2.3 Current Natural Character ..................................................................................................... 18 3.2.4 Physical Characteristics ........................................................................................................ 18 3.2.5 Hydrology .............................................................................................................................. 18 3.2.6 Ecological Values.................................................................................................................. 18 3.2.7 Macroalgae ........................................................................................................................... 19 3.2.8 Sediments ............................................................................................................................. 20 3.2.9 Water Quality ........................................................................................................................ 21 3.2.10 Invertebrates ......................................................................................................................... 22 3.2.11 Fish ....................................................................................................................................... 23 3.2.12 Birds ...................................................................................................................................... 24 3.2.13 Recreation ............................................................................................................................ 24 3.2.14 Hutt River Mouth Sediment Extraction .................................................................................. 25 3.2.15 Policy statement and plan schedules applying to the Hutt River site .................................... 25 3.3 Wellington Harbour ...................................................................................................................... 26 3.3.1 Hydrodynamics ..................................................................................................................... 26 3.3.2 Intertidal Ecology .................................................................................................................. 26 3.3.3 Edible Shellfish ..................................................................................................................... 26 3.3.4 Subtidal Ecology ................................................................................................................... 26 4. Reasons why resource consent is required ...................................................................................... 27 4.1 Intermittent discharges to the Waiwhetū Stream ......................................................................... 27 4.1.1 Regional Freshwater Plan ..................................................................................................... 27 4.1.2 Proposed Natural Resources Plan .......................................................................................