JBA Consulting Carried out This Work
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Office of Public Works Arterial Drainage Maintenance Works - Boyne Arterial Drainage Scheme Natura Impact Statement July 2016 Office of Public Works Main Street Headford Co Galway Ireland JBA Project Manager Tom Sampson 24 Grove Island Corbally Limerick Ireland Revision History Revision Ref / Date Issued Amendments Issued to Nathy Gilligan, OPW V1.0 / Feb 2016 Draft report Tony Brew, OPW Final Report. Crayfish Nathy Gilligan, OPW V2.0 / March 2016 mitigation. Tony Brew, OPW Final Report. Updated crayfish Nathy Gilligan, OPW V2.1 / April 2016 mitigation. Tony Brew, OPW Final Report. Updated crayfish Nathy Gilligan, OPW V2.2 / April 2016 mitigation and table 6.1 Tony Brew, OPW Final Report. Updates to Nathy Gilligan, OPW V2.3 / July 2016 Himalayan Balsam mitigation, Tony Brew, OPW survey details and dates Contract This report describes work commissioned by the Office of Public Works, by a letter dated 05/06/2015. The Office of Public Works’ representative for the contract was Tony Brew. Niamh Sweeney, Anne Murray, Catalina Hererra, and Tom Sampson of JBA Consulting carried out this work. Prepared by .................................................. Niamh Sweeney MSc. Ecologist Reviewed by ................................................. Anne Murray BSc. MCIEEM Senior Ecologist Purpose This document has been prepared as a Final Report for the OPW. JBA Consulting accepts no responsibility or liability for any use that is made of this document other than by the Client for the purposes for which it was originally commissioned and prepared. JBA Consulting has no liability regarding the use of this report except to the OPW. Copyright © JBA Consulting Engineers and Scientists Ltd 2016 Carbon Footprint A printed copy of the main text in this document will result in a carbon footprint of if 100% post- consumer recycled paper is used and if primary-source paper is used. These figures assume the report is printed in black and white on A4 paper and in duplex. JBA is aiming to reduce its per capita carbon emissions. 2015s2905 Boyne NIS v2.3 i Contents 1 Introduction .......................................................................................................... 1 1.1 Background ............................................................................................................ 1 1.2 Legislative Context ................................................................................................ 1 1.3 Appropriate Assessment Process ......................................................................... 1 1.4 Methodology .......................................................................................................... 3 2 Arterial Drainage Maintenance ........................................................................... 4 2.1 Background ............................................................................................................ 4 2.2 Drainage Maintenance Activities ........................................................................... 4 2.3 The Boyne Arterial Drainage Scheme ................................................................... 10 2.4 Drainage Maintenance Works Proposed for the Boyne Arterial Drainage Scheme .................................................................................................................. 10 3 Screening Assessment Results ......................................................................... 12 3.1 Introduction ............................................................................................................ 12 3.2 Screening Assessment Conclusions ..................................................................... 13 4 Natura 2000 sites within the Zone of Influence of Drainage Maintenance Activities ............................................................................................................... 15 4.1 Introduction ............................................................................................................ 15 4.2 River Boyne and River Blackwater SPA (004232) ................................................ 15 4.3 Boyne Estuary SPA (004080) ................................................................................ 16 4.4 Killyconny Bog (Cloghbally) SAC (000006) ........................................................... 18 4.5 Mount Hevey Bog SAC (002342) .......................................................................... 20 4.6 Raheenmore Bog SAC (000582) ........................................................................... 21 4.7 White Lough, Ben Loughs and Lough Doo SAC (001810) .................................... 24 4.8 Boyne Coast and Estuary SAC (001957) .............................................................. 25 4.9 Lough Bane and Lough Glass SAC (002120) ....................................................... 26 4.10 Lough Lene SAC (002121) .................................................................................... 28 4.11 River Boyne and River Blackwater SAC (002299) ................................................ 29 4.12 Description of the receiving environment - Ecological Walkover Survey Results . 31 5 Appropriate Assessment .................................................................................... 43 5.1 Introduction ............................................................................................................ 43 5.2 Identification of Potential Sources of Impact ......................................................... 43 5.3 Impact Assessment ............................................................................................... 48 6 Avoidance and Mitigation Measures ................................................................. 80 6.1 Introduction ............................................................................................................ 80 7 Conclusions ......................................................................................................... 82 Appendices........................................................................................................................ I A OPW Arterial Drainage Maintenance Service: Environmental Management Protocols and Standard Operating Procedures ............................................... I B Maps of the Boyne Arterial Drainage Scheme .................................................. II C Drainage Maintenance Activities Proposed for Boyne 2016-2020 ................. III D Watercourses Screened into Appropriate Assessment (JBA, 2014) ............. IV E Additional Locations of Kingfisher nest sites and Invasive Species. ............ V 2015s2905 Boyne NIS v2.3 List of Figures Figure 1-1: The Appropriate Assessment Process (from: Appropriate Assessment of Plans and Projects in Ireland - Guidance for Planning Authorities, DEHLG, 2009) ................................................................................................................. 2 Figure 2-1: Examples of Plane Bed to Low Gradient Channels on the River Boyne downstream of Navan (left) and upstream of Trim (Right) ................................ 5 Figure 2-2: Examples of Medium to High Gradient Channels near Crossakeel ................ 6 Figure 2-3: Map of the Boyne Arterial Drainage Scheme .................................................. 10 Figure 4-1. Invasive Species: Himalayan Balsam and Japanese Knotweed. .................... 38 Figure 4-1. Invasive Species: Himalayan Balsam and Japanese Knotweed ..................... 39 Figure 4-3. Otter activity, physical resting places, and sightings........................................ 40 Figure 4-4. Kingfisher activity, physical resting places, and sightings. .............................. 41 Figure 4-2. Invasive Species: Himalayan Balsam and Japanese Knotweed ..................... 41 List of Tables Table 2-1: OPW Drainage Maintenance Subcategories ................................................... 4 Table 2-2: OPW Drainage Maintenance Types ................................................................. 4 Table 2-3: Channels subject to tree cutting ........................................................................ 11 Table 3-1: Screening Assessment Conclusion (JBA, 2014) ............................................... 13 Table 4-1: Qualifying Interests of River Boyne and River Blackwater SPA (004232) ....... 15 Table 4-2: Qualifying Interests of Boyne Estuary SPA (004080) ...................................... 16 Table 4-3: Conservation Objectives for the Waterbird Special Conservation Interests of Boyne Estuary SPA. .......................................................................................... 17 Table 4-4: Conservation Objectives for Killyconny Bog (Cloghbally) SAC (000006). ........ 18 Table 4-5: Conservation Objectives of Raheenmore Bog SAC (000582) (From: NPWS, 2015f) ................................................................................................................ 22 Table 4-6: Attributes for the Qualifying Interests of White Lough, Ben Loughs and Lough Doo SAC (001810) ................................................................................. 24 Table 4-7: Qualifying Interests of Boyne Coast And Estuary SAC (001957) .................... 26 Table 4-8: Qualifying Interests of Lough Bane and Lough Glass SAC (002120) .............. 27 Table 4-3: Qualifying Interests of Lough Lene SAC (002121)........................................... 28 Table 4-4: Qualifying Interests of River Boyne and River Blackwater SAC (002299) ....... 30 Table 4-5: Potential Annex I Habitats Identified