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Benthic Ecology Characterisation Report Emu Limited Head Office 1 Mill Court The Sawmills Durley NEART NA GAOITHE Southampton SO32 2EJ UK Tel: +44 (0)1489 860050 PROPOSED OFFSHORE Fax: +44 (0)1489 860051 www.emulimited.com WIND FARM Benthic Ecology Characterisation Survey FINAL REPORT also at Emu Limited Marine Laboratories Ferry Road Hayling Island A Report for: Hampshire PO11 0DG UK Neart na Gaoithe Tel: +44 (0)23 9263 6800 Fax: +44 (0)23 9263 7215 www.emulimited.com Offshore Wind Ltd. Emu Limited Oceanography Unit 7 Hayling Billy Industrial Estate Hayling Island Hampshire Report No : 09/J/1/03/1483/0943 PO11 0ED UK Issue date : June 2010 Tel: +44 (0)23 9231 1130 Fax: +44 (0)23 9263 7759 www.emulimited.com Emu contact : Mr Paul English Job No.: J/1/03/1483 Tel : 01489 860050 The copyright and intellectual property rights in this document are the property of Emu Limited. The said intellectual property rights shall not be used, nor shall this document be copied without the express consent of Emu Limited Neart na Gaoithe Offshore Wind Ltd. Neart na Gaoithe Proposed Offshore Wind Farm Benthic Ecology Characterisation Survey Document Release and Authorisation Record Job No: J/1/03/1483 Report No: 09/J/1/03/1483/0943 Version: 1 Date: June 2010 Client Name: Neart na Gaoithe Offshore Wind Ltd Status: Final Client Contact(s): Cameron Smith Zoe Crutchfield QA Name Initial Date Project Manager Dr N.S. Thomas Paul English Report written by Erin Pettifer Data analysed by Paul English Report checked by Dr N.S. Thomas Report authorised by Dr N.S. Thomas 09/J/1/03/1483/0943/PAE/Jun 2010 i Emu Ltd. Neart na Gaoithe Offshore Wind Ltd. Neart na Gaoithe Proposed Offshore Wind Farm Benthic Ecology Characterisation Survey 09/J/1/03/1483/0943/PAE/Jun 2010 ii Emu Ltd. Neart na Gaoithe Offshore Wind Ltd. Neart na Gaoithe Proposed Offshore Wind Farm Benthic Ecology Characterisation Survey Table of Contents Page No 1.0 INTRODUCTION ......................................................................................................................................... 1 Background to the study .................................................................................................................................. 1 The regional benthic context ........................................................................................................................... 2 2009 geophysical study .................................................................................................................................... 4 2.0 METHODS .................................................................................................................................................. 6 Intertidal biotope mapping survey .................................................................................................................. 6 Intertidal biotope map production .................................................................................................................. 8 Subtidal survey ................................................................................................................................................. 8 Site positioning and sampling ........................................................................................................................ 11 Benthic laboratory processing ....................................................................................................................... 12 Data Analysis .................................................................................................................................................. 13 3.0 INTERTIDAL SURVEY RESULTS ................................................................................................................. 15 Cockenzie biotope results .............................................................................................................................. 15 Biotope distribution at Cockenzie ................................................................................................................. 28 Thorntonloch biotope results ........................................................................................................................ 29 Biotope distribution at Thorntonloch ............................................................................................................ 43 Skateraw biotope results ............................................................................................................................... 45 Biotope distribution at Skateraw ................................................................................................................... 70 4.0 SUBTIDAL SURVEY RESULTS .................................................................................................................... 72 Sediment particle size distribution data (PSD) .............................................................................................. 72 Macrofaunal grab sample data ...................................................................................................................... 81 Seabed image data ......................................................................................................................................... 90 2 m beam trawl data ...................................................................................................................................... 95 Biotope map of the proposed turbine array ................................................................................................. 98 Seabed contaminants .................................................................................................................................... 99 4.0 DISCUSSION .......................................................................................................................................... 100 Seabed benthic environment ...................................................................................................................... 100 Intertidal environment ................................................................................................................................. 101 5.0 CONCLUSIONS ....................................................................................................................................... 103 6.0 REFERENCES .......................................................................................................................................... 104 APPENDICES (on CD) 09/J/1/03/1483/0943/PAE/Jun 2010 iii Emu Ltd. Neart na Gaoithe Offshore Wind Ltd. Neart na Gaoithe Proposed Offshore Wind Farm Benthic Ecology Characterisation Survey 09/J/1/03/1483/0943/PAE/Jun 2010 iv Emu Ltd. Neart na Gaoithe Offshore Wind Ltd. Neart na Gaoithe Proposed Offshore Wind Farm Benthic Ecology Characterisation Survey 1 Introduction Background to the Study 1.1 Neart na Gaoithe Offshore Wind Limited (NnGOWL) has been awarded exclusive rights for the development of the Neart na Gaoithe offshore wind farm. 1.2 The proposed development will be located within the outer Forth Estuary some 15.5 km east of Fife Ness and 30 km north of Torness and will cover 105 km2. It is likely to consist of 75 turbines, each having a capacity of 6 MW, giving a total installed capacity of 450 MW. 1.3 Associated cable route options include a 54 km to the south west making landfall at Cockenzie further up the Forth Estuary, and the Torness Cable route, which incorporates two choices for connections at either Skateraw or Thorntonloch, and runs more or less south of the site for 32 km. Figure 1.1 shows the location of the proposed offshore wind farm site and cable possible routes. Figure 1.1: Location of the proposed Neart na Gaoithe offshore wind farm development site and cable route options. 1.4 Details regarding the need for the development together with the site selection process have been presented within the scoping report which may be found at http://www.neartnagaoithe.com/. 1.5 This proposed development is now undergoing rigorous environmental and technical assessment prior to making any application for consent. The final consent application requires a supporting Environmental Impact Assessment (EIA) presenting, amongst other issues, detailed appraisals of the potential effects of the construction and operation of the development on benthic habitats and species within the turbine array, along the cable route options and at the different cable landfall sites currently under consideration. 1.6 Emu Ltd was commissioned to undertake a series of benthic ecology sampling surveys of the turbine array site, the cable route options and associated intertidal areas where the cables are proposed to make landfall for the purposes of collecting physical, chemical and biological data suitable for informing 09/J/1/03/1483/0943/PAE/Jun 2010 1 Emu Ltd. Neart na Gaoithe Offshore Wind Ltd. Neart na Gaoithe Proposed Offshore Wind Farm Benthic Ecology Characterisation Survey an EIA and development of an Environmental Statement. This document presents the survey methods used, the data collected and gives a characterisation of the intertidal and subtidal environment within and around the proposed development in terms of the habitats available and associated biological communities. 1.7 The data derived from these surveys will be used to underpin the EIA with respect to predicted effects of the construction and operation of the Neart na Gaoithe offshore wind farm on the local seabed ecology. In particular, the data will highlight potential ecological
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