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Morlais Project Environmental Statement Chapter 11: Marine Ornithology Volume I Applicant: Menter Môn Morlais Limited Document Reference: PB5034-ES-011 Chapter 11: Marine Ornithology Author: Royal HaskoningDHV Morlais Document No.: Status: Version No: Date: MMC362 MOR/RHDHV/DOC/0016 (04) Final F4.0 22/10/20 © 2020 Menter Môn This document is issued and controlled by: Morlais, Menter Mon. Registered Address: Llangefni Town Hall, Anglesey, Wales, LL77 7LR, UK Unauthorised copies of this document are NOT to be made Company registration No: 03160233 Requests for additional copies shall be made to Morlais Project Document Title: Morlais ES Chapter 11: Marine Ornithology Document Reference: PB5034-ES-011 Version Number: F4.0 TABLE OF CONTENTS TABLE OF TABLES ........................................................................................................... II TABLE OF FIGURES (VOLUME II) ....................................................................................III TABLE OF APPENDICES (VOLUME III).............................................................................III GLOSSARY OF ABBREVIATIONS ................................................................................... IV GLOSSARY OF TERMINOLOGY ...................................................................................... IV 11. MARINE ORNITHOLOGY ........................................................................................ 1 11.1. INTRODUCTION ..................................................................................................... 1 11.2. POLICY, LEGISLATION AND GUIDANCE ................................................................ 1 11.3. CONSULTATION ....................................................................................................10 11.4. METHODOLOGY....................................................................................................26 11.5. EXISTING ENVIRONMENT ....................................................................................28 11.6. IMPACT ASSESSMENT .........................................................................................37 11.7. TRANSBOUNDARY IMPACTS................................................................................81 11.8. INTER-RELATIONSHIPS ........................................................................................81 11.9. INTERACTIONS .....................................................................................................82 11.10. SUMMARY .............................................................................................................83 11.11. REFERENCES .......................................................................................................90 Menter Môn Morlais Project Page | i Document Title: Morlais ES Chapter 11: Marine Ornithology Document Reference: PB5034-ES-011 Version Number: F4.0 TABLE OF TABLES Table 11-1 Summary of Legislation and Relevant Measures............................................................. 1 Table 11-2 Summary of National (UK and Wales) Policies, Plans and Relevant Measures ................ 2 Table 11-3 National l Policy Requirements Relevant to Marine Ornithology ....................................... 5 Table 11-4 NPS EN-1 and EN-3 Assessment Requirements ............................................................ 6 Table 11-5 Joint Local Development Plan (Anglesey and Gwynedd) Relevant Policy and Guidance Requirements ................................................................................................................................. 9 Table 11-6 Summary of Consultation Responses ........................................................................... 10 Table 11-7 Detailed Consultation Responses ................................................................................. 13 Table 11-8 Definitions of Receptor Importance Levels for Marine Ornithology Receptors ................. 28 Table 11-9 Definition of the Breeding, Migration and Winter Seasons for Marine Ornithology Receptors included in the EcIA, as per Furness (2015) unless otherwise stated .............................................. 29 Table 11-10 Conservation Status of Marine Ornithology Receptors Recorded in the MDZ and 2 km Buffer to be Considered by EcIA.................................................................................................... 30 Table 11-11 Marine Ornithology Receptors and their Possible Origin .............................................. 32 Table 11-12 Importance Levels Assigned to Marine Ornithology Receptors for Project EcIA ............ 37 Table 11-13 Screening Exercise Undertaken for Potential Disturbance and Displacement Impacts During Construction of the Project ................................................................................................. 41 Table 11-14 Numbers of Species Screened into Disturbance and Displacement Assessment that will Occur Within Construction Vessel Disturbance Zone, Assuming Seven Groups of Vessels on Site Simultaneously, Based on Maximum Densities in MDZ and 2 km Buffer (MDZ only for guillemot and razorbill), and % Displacement and Mortality Values Used for Assessment ..................................... 44 Table 11-15 Anticipated Seabird Mortality Levels Predicted Due to Airborne Noise and Visual Disturbance in the MDZ and ECC During Construction of the Project (based on parameters presented in Table 11-14) ............................................................................................................................. 44 Table 11-16 Latest Colony Counts at Breeding Seabird Colonies Closest to MDZ from SMP Database and RSPB .................................................................................................................................... 47 Table 11-17 Approximate Distances between MDZ, ECC, and Key Breeding Seabird Colony Locations within the South Stack and Penlas SMP Master Site ...................................................................... 47 Table 11-18 Habitat Flexibility and Sensitivity of Marine Ornithology Receptors to Indirect (Prey and Pollution) and Direct Pollution Impacts ........................................................................................... 50 Table 11-19 Number of Predicted Collisions in a Single Season (Mean of ERM and CRM) for Diving Species Recorded in MDZ by Appropriate Time Period, at a Range of Different Avoidance Rates, for a Deployment Scale of 240 MW ....................................................................................................... 59 Table 11-20 Collision Rates at 95-99.9 % Avoidance Rates (Mean of ERM and CRM) Relative to Relevant Reference Populations, at a Deployment Scale of 240 MW for a Single Season ............... 59 Table 11-21 CPGR and CPS (25 year) Metrics for PVA for South Stack and Penlas SMP Sub-Colonies for Guillemot During the Breeding Season, 240 MW Deployment.................................................... 60 Table 11-22 CPGR and CPS (25 year) Metrics for PVA for South Stack and Penlas SMP Sub-Colonies for Razorbill During the Breeding Season, 240 MW Deployment ..................................................... 61 Table 11-23 Number of Predicted Collisions in a Single Season (Mean of ERM and CRM) for Diving Species Recorded in MDZ by Appropriate Time Period, at a Range of Different Avoidance Rates, for a Worst-Case Device Envelope Scenario at a Deployment Scale of 40 MW ....................................... 63 Table 11-24 Collision Rates at 95 to 99.9 % Avoidance Rates (Mean of ERM and CRM) Relative to Relevant Reference Populations, for a Worst-Case Device Envelope Scenario at a Deployment Scale of 40 MW, in a Single Season ....................................................................................................... 63 Menter Môn Morlais Project Page | ii Document Title: Morlais ES Chapter 11: Marine Ornithology Document Reference: PB5034-ES-011 Version Number: F4.0 Table 11-25 CPGR and CPS (25 year) Metrics for PVA for South Stack and Penlas SMP Sub-Colonies for Guillemot During the Breeding Season, 40 MW Worst-Case Deployment ................................... 64 Table 11-26 CPGR and CPS (25 year) Metrics for South Stack and Penlas SMP Sub-Colonies for Razorbill During the Breeding Season, 40 MW Worst-Case Deployment ......................................... 65 Table 11-27 Screening Exercise Undertaken for Potential Entanglement Impacts During the Operation / Repowering of the Project ........................................................................................................... 69 Table 11-28 Cumulative Impact Assessment Screening ................................................................. 74 Table 11-29 Summary of Projects Considered in CIA for Airborne Noise and Visual Disturbance Impact Pathway ....................................................................................................................................... 76 Table 11-30 Summary of Projects Considered in CIA for Underwater Collision Risk Impact Pathway 76 Table 11-31 Inter-Topic Relationships ........................................................................................... 82 Table 11-32 Potential for Interactions Between Impacts During Construction .................................. 82 Table 11-33 Potential for Interactions Between Impacts During Operation / Repowering .................. 83 Table 11-34 Summary of Impacts Identified for Marine Ornithology Receptors ................................ 86 TABLE OF FIGURES (VOLUME

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