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Wylfa Newydd Project ENERGY WORKING FOR BRITAIN FOR WORKING ENERGY Wylfa Newydd Project 6.4.84 ES Volume D - WNDA Development App D13-2 - Benthic Ecology Report PINS Reference Number: EN010007 Application Reference Number: 6.4.84 June 2018 Revision 1.0 Regulation Number: 5(2)(a) Planning Act 2008 Infrastructure Planning (Applications: Prescribed Forms and Procedure) Regulations 2009 Horizon Internal DCRM Number: WN0902-JAC-PAC-APP-00088 [This page is intentionally blank] Wylfa Newydd Project Horizon Nuclear Power Wylfa Limited Benthic Surveys Report Document No. 60PO8007/AQE/REP/005 |7 20 December 2017 WN03.01.01-S5-PA-REP-00023 Benthic S urveys Report Horizon Nuclear Power Wylfa Limited Document history and status Revision Date Description By Review Approved 1 May 2012 Benthic Ecology Surveys Report Chris Nikitik Colin Trigg Rob Bromley 2 Nov 2012 Updated with 2012 data Chris Nikitik Rob Bromley Rob Bromley 3 Nov 2013 Updated with 2013 data Chris Nikitik Isabel Lee-Elliott Rob Bromley 4 Feb 2013 Updated with 2014 data Chris Nikitik Isabel Lee-Elliott Rob Bromley 5 March 2016 Updated with 2015 data Louise Foster Matt Doggett Rob Bromley Restructured and updated to include Marja Aberson/ 6 June 2017 Emma Collins Rob Bromley Holyhead North data Colin Trigg December 7 Updated with Cemlyn Lagoon data Liam Byrne Colin Trigg Rachel Wilson 2017 Distribution of copies Revision Issue Date issued Issued to Comments approved Benthic Surveys Report Wylfa Newydd Project Project No: 60PO8082 Document Title: Benthic Surveys Report Document No.: Document No. 60PO8007/AQE/REP/005 Revision: 7 Date: 20 December 2017 Client Name: Horizon Nuclear Power Wylfa Limited Project Manager: Rob Bromley Author: Coling Trigg and Marja Aberson File Name: Benthic Surveys Report_2017_Rev 7.0 Kenneth Dibben House Enterprise Road, Southampton Science Park Chilworth, Southampton SO16 7NS United Kingdom T +44 (0)23 8011 1250 F +44 (0)23 8011 1251 www.jacobs.com © Copyright 2017 Please select a legal entity from the Change Document Details option on the Jacobs ribbon. The concepts and information contained in this document are the property of Jacobs. Use or copying of this document in whole or in part without the written permission of Jacobs constitutes an infringement of copyright. Limitation: This document has been prepared on behalf of, and for the exclusive use of Jacobs’ client, and is subject to, and issued in accordance with, the provisions of the contract between Jacobs and the client. Jacobs accepts no liability or responsibility whatsoever for, or in respect of, any use of, or reliance upon, this document by any third party. Document No. 60PO8007/AQE/REP/005 2 Benthic Surveys Report Contents Executive Summary ................................................................................................................................... 9 1. Introduction .................................................................................................................................. 11 1.1 Overview ........................................................................................................................................ 11 1.2 The Wylfa Newydd Project ............................................................................................................. 11 1.3 Site Description .............................................................................................................................. 11 1.3.1 Wylfa Newydd Development Area ................................................................................................. 11 1.3.2 The Holyhead North Disposal Site ................................................................................................. 14 1.4 Study Aims and Objectives ............................................................................................................ 16 1.5 Study Areas ................................................................................................................................... 16 1.5.1 Wylfa Newydd Development Area ................................................................................................. 16 1.5.2 Disposal Site .................................................................................................................................. 17 1.6 Surveys .......................................................................................................................................... 17 1.6.1 Intertidal Benthic Surveys .............................................................................................................. 17 1.6.2 Subtidal Drop-Down Camera Surveys ........................................................................................... 17 1.6.3 Subtidal Grab Surveys ................................................................................................................... 17 1.6.4 Rapid Assessment Surveys ........................................................................................................... 18 2. Literature Review ......................................................................................................................... 19 2.1 Intertidal Environment .................................................................................................................... 19 2.1.1 Intertidal Invertebrates ................................................................................................................... 19 2.1.2 Intertidal Communities ................................................................................................................... 19 2.1.3 MarClim Data ................................................................................................................................. 20 2.2 Subtidal Environment ..................................................................................................................... 20 2.2.1 Subtidal Invertebrates .................................................................................................................... 20 2.2.2 Survey of North Wales and Pembrokeshire Tide Influenced Communities (2004) ......................... 21 2.2.3 North Anglesey Invasive Non-Native Species and Sabellaria spp. Video and Still Image Analysis (2017) ............................................................................................................................................ 21 2.2.4 Deep Green Project Holyhead Deep Benthic Technical Report (2016) .......................................... 22 2.2.5 Geophysical Surveys and Habitat Mapping ................................................................................... 22 2.3 Cemlyn Lagoon .............................................................................................................................. 23 2.3.1 Sediment ....................................................................................................................................... 23 2.3.2 Flora .............................................................................................................................................. 23 2.3.3 Benthic fauna ................................................................................................................................. 24 3. Marine Sediment .......................................................................................................................... 27 3.1 Introduction .................................................................................................................................... 27 3.2 Methods ......................................................................................................................................... 27 3.2.1 Site Selection ................................................................................................................................. 27 3.2.1.1 Intertidal Site Selection .................................................................................................................. 27 3.2.1.2 Subtidal Site Selection ................................................................................................................... 29 3.2.2 Sampling Methodology .................................................................................................................. 33 Document No. 60PO8007/AQE/REP/005 3 Benthic Surveys Report 3.2.2.1 Intertidal Sampling Methodology .................................................................................................... 33 3.2.2.2 Subtidal Sampling Methodology ..................................................................................................... 33 3.2.3 Laboratory Analytical Methods ....................................................................................................... 33 3.2.3.1 Limit of Detection (LoD) and Minimum Reporting Values (MRV) ................................................... 34 3.2.4 Determinands Monitored ................................................................................................................ 34 3.2.4.1 Metals ............................................................................................................................................ 34 3.2.4.2 Polycyclic Aromatic Hydrocarbons (PAHs) .................................................................................... 35 3.2.4.3 Polychlorinated Biphenyls (PCBs) ................................................................................................. 35 3.2.5 Sediment Quality Standards .........................................................................................................
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