Matawii Water Storage Reservoir – Offset and Compensation Plan 24 July 2020 puhoistour.co.nz PUHOI STOUR LIMITED LYSAGHT BUILDING | 101 PAKENHAM STREET AUCKLAND 1010 Matawii Water Storage Reservoir – Offset and Compensation Plan Prepared by Puhoi Stour Ltd in association with Tonkin & Taylor Ltd. David Pickett, Justine Quinn, Josh Markham, Martin Neale. Document History PSL Report Number 2020/09 Version Date Reviewed by Draft for PSL review 23 July 2020 Martin Neale Final 24 July 2020 Martin Neale Table of Contents Table of Contents ........................................................................................................................................................................... 3 1. Introduction ............................................................................................................................................................................ 5 1.1 Plan purpose and scope ............................................................................................................................................... 5 1.2 Responsibilities and competencies ............................................................................................................................... 6 1.3 Plan structure ............................................................................................................................................................... 6 2. Ecological values and effects summary ................................................................................................................................ 7 2.1 Terrestrial and wetland biodiversity .............................................................................................................................. 7 2.1.1 Terrestrial ecological values ................................................................................................................................ 7 2.1.2 Summary of terrestrial ecological effects ............................................................................................................. 8 2.1.3 Measures to avoid, remedy or mitigate effects .................................................................................................... 9 2.2 Freshwater biodiversity ............................................................................................................................................... 10 2.2.1 Freshwater ecological values ............................................................................................................................. 10 2.2.2 Summary of freshwater ecological effects ......................................................................................................... 10 2.2.3 Measures to avoid, remedy or mitigate effects .................................................................................................. 11 2.3 Measures to address residual adverse ecological effects .......................................................................................... 11 2.3.1 Biodiversity offset accounting model (BOAM) .................................................................................................... 12 2.3.2 Stream ecological valuation and environmental compensation ratio (SEV and ECR) ....................................... 13 3. Ecological enhancement and restoration plan ..................................................................................................................... 16 3.1 Offsetting principles .................................................................................................................................................... 16 3.2 Restoration and enhancement principles.................................................................................................................... 17 3.2.1 Fragmentation .................................................................................................................................................... 17 3.2.2 Connectivity ....................................................................................................................................................... 17 3.2.3 Nursery species and succession........................................................................................................................ 17 3.2.4 Seed bank .......................................................................................................................................................... 17 3.2.5 Ecological buffer ................................................................................................................................................ 17 3.2.6 Whole ecosystem approach ............................................................................................................................... 17 3.3 Implementation of restoration activities ...................................................................................................................... 18 3.3.1 Site preparation .................................................................................................................................................. 18 3.3.2 Weed plant control ............................................................................................................................................. 18 3.3.3 Plant establishment pest animal control ............................................................................................................. 19 3.3.4 Stock-proof fencing ............................................................................................................................................ 19 3.3.5 Planting guidelines ............................................................................................................................................. 20 3.3.6 Plant species specifications ............................................................................................................................... 20 3.3.7 Post-planting maintenance ................................................................................................................................ 21 3.3.8 Programme ........................................................................................................................................................ 21 3.4 Biosecurity measures ................................................................................................................................................. 23 3.4.1 Myrtle rust .......................................................................................................................................................... 23 3.5 Monitoring and reporting requirements ....................................................................................................................... 23 3.5.1 Compliance confirmation report ......................................................................................................................... 23 3.5.2 Incident reporting ............................................................................................................................................... 23 3.5.3 Compliance monitoring reporting ....................................................................................................................... 23 4. Report applicability .............................................................................................................................................................. 25 5. Appendices .......................................................................................................................................................................... 26 Appendix A: Offset Plan ........................................................................................................................................................... 27 Appendix B: Indicative offset sites - photographs .................................................................................................................... 29 Appendix C: Proposed offset species lists ............................................................................................................................... 30 1. Introduction Te Tai Tokerau Water Trust Board have received provincial growth funding to provide improved water supply in Northland. Williamson Water and Land Advisory (WWLA) is leading the provision of a range of technical services to inform the project. Puhoi Stour Limited (PSL) and its subconsultant Tonkin & Taylor Limited (T+T) have collaborated to prepare this Offset and Compensation Plan to address the residual ecological effects associated with the proposed Matawii Water Supply Reservoir (the Project) at 5435 State Highway 12 Kaikohe, in the Far North (Figure 1). Te Tai Tokerau Water Trust Board proposes to construct a new water supply reservoir, by constructing a dam across the Kopenui Stream, and inundating a section of the Kopenui Stream, including parts of four headwater gullies, and surrounding land. The construction and ongoing operation of the water supply dam is anticipated to have effects on terrestrial, wetland and aquatic ecological values. The detail regarding these ecological values and effects is presented in the Matawii Water Storage Reservoir: Assessment of Ecological Effects report (AEcE, PSL Report Number 2020/02, dated 10 July 2020). Figure 1: Location of proposed reservoir at 5435 State Highway 12, Kaikohe. 1.1 Plan purpose and scope A suite of Fauna Management Plans will