Killimor Arterial Drainage Scheme 2020 - 2024
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1 Galway Business Park, Dangan, Galway H91A3EF 173 Ivy Exchange, Granby Place, Parnell Square West, Dublin 1 Arterial Drainage Maintenance Works: Killimor Arterial Drainage Scheme 2020 - 2024 Natura Impact Statement March 2020 Report Control Sheet FORM 214 Rev 002 Business Management System Client OPW Project No. 2514 Project Title Killimor Arterial Drainage Scheme, Co. Galway Report Title Killimor Arterial Drainage Scheme 2020-2024 - NIS Rev. Status Authors Reviewed By Approved By Issue Date Sinéad Brady / S. - Draft S. Gavin D. Bourke 11/11/2019 Gavin 0 Draft S Gavin S Gavin D. Bourke 19/11/2019 1 For Issue S Brady S Gavin D Bourke 12/12/2019 In response 2 to comments G. Kilbane S. Gavin D. Bourke 03/03/2020 from NPWS Natura Impact Statement Page ii Killimor Arterial Drainage Scheme- NIS Executive Summary Ryan Hanley has been commissioned by the Office of Public Works (OPW) to provide environmental consultancy services in relation to statutory arterial drainage maintenance activities for 2019. Following the methodology outlined in Ryan Hanley (2014a), a screening assessment was conducted to assess the likely significant effects on European sites of the proposed drainage maintenance activities in the Killimor Arterial Drainage Scheme in accordance with Article 6(3) of the Habitats Directive (Council Directive 92/43/EEC on the conservation of natural habitats and of wild fauna and flora). Three “source > pathway > receptor chains” were examined to assess the likely impact of drainage maintenance activities on European sites; surface water, land and air, and groundwater pathways. The results of this screening exercise identified that significant adverse impacts could not be excluded on the following European sites: ▪ Ardgraigue Bog SAC (002356) ▪ Barroughter Bog SAC (000231) ▪ Lough Derg, North-East Shore SAC (002241) ▪ Lough Derg (Shannon) SPA (004058) ▪ Slieve Aughty Mountains SPA (004168) As a result, it was necessary to conduct a Stage 2 Appropriate Assessment to further examine the potential direct and indirect impacts of the proposed works on the integrity and interest features of the above European sites, alone and in- combination with other plans and projects, taking into account the site's structure, function and conservation objectives. Further examination of the potential sources of impact on the European sites above, looking at surface water, land and air and groundwater pathways, was conducted. Where potentially significant adverse impacts were identified, a range of mitigation and avoidance measures have been stipulated to help offset them. As a result of this Appropriate Assessment it has been concluded, that given the avoidance and mitigation measures suggested, the proposed drainage maintenance operations in the Killimor Arterial Drainage Scheme will not have a significant adverse impact on the above European sites. Natura Impact Statement Page i Killimor Arterial Drainage Scheme- NIS Contents Executive Summary .................................................................................................................... i 1 Introduction ....................................................................................................................... 1 Background ................................................................................................................................ 1 Legislative Context .................................................................................................................... 1 Appropriate Assessment Process ............................................................................................. 2 Methodology .............................................................................................................................. 3 2 Arterial Drainage Maintenance ........................................................................................ 6 Background ................................................................................................................................ 6 Drainage Maintenance Activities ............................................................................................... 6 The Killimor Arterial Drainage Scheme ...................................................................................15 Drainage Maintenance Works Proposed for the Killimor Arterial Drainage Scheme ..............15 3 Screening Assessment Results ..................................................................................... 17 Introduction ..............................................................................................................................17 Screening Assessment Conclusions .......................................................................................20 4 European Sites within the Zone of Influence of Drainage Maintenance Activities .... 22 Introduction ..............................................................................................................................22 Ardgraigue Bog SAC (002356) ................................................................................................22 Barroughter Bog SAC (000231) ..............................................................................................24 Lough Derg, North-East Shore SAC (002241) ........................................................................25 Lough Derg (Shannon) SPA (004058) ....................................................................................28 Slieve Aughty Mountains SPA (004168) .................................................................................30 Description of the receiving environment - Ecological Walkover Survey Results ...................31 5 Appropriate Assessment ............................................................................................... 42 Introduction ..............................................................................................................................42 Identification of Potential Sources of Impact ...........................................................................42 Impact Assessment .................................................................................................................45 6 Avoidance and Mitigation Measures ............................................................................. 60 Introduction ..............................................................................................................................60 Mitigation for Other Ecological Receptors ...............................................................................60 Mitigation for Bridge/Structure Maintenance Works ................................................................62 7 Conclusions .................................................................................................................... 63 Natura Impact Statement Page 2 Killimor Arterial Drainage Scheme- NIS Appendix A .................................................................................................................... Maps of Channels within the Killimor 2020 – 2024 Programme....................... ii Killimor 2020 – 2024 Maintenance Programme................................................. vii Natura Impact Statement Page 3 Killimor Arterial Drainage Scheme- NIS 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 1-2: Screening assessment process...................................................................................................................... 4 Figure 2-1: Plane Bed to Low Gradient Channels in Killimor Arterial Drainage Scheme (D1 left; Cappagh River C1 right) 8 Figure 2-2: Medium to High Gradient Channels in the Killimor Arterial Drainage scheme (both taken on C2/10/1) ............................................................................................................................................................................. 8 Figure 2-3: Map of the Killimor Scheme as identified in the AA Screening Report (2014) ........................ 15 Figure 3-1: Channels and embankments with potential impacts via surface water pathways as identified in the AA Screening Report (2014) ............................................................................................................................... 18 Figure 3-2: Channels and embankments with potential impacts via land and air pathways as identified in the AA Screening Report ............................................................................................................................................. 19 Figure 3-3: Channels and embankments with potential impacts via groundwater pathways as identified in the AA Screening Report (2014) ............................................................................................................................... 20 Figure 3-4: Map of all channels, embankments and structures where significant likely effects may arise 21 Figure 4-1: Sample Habitat Map .................................................................................................................................. 33 List of Tables Table 2-1: OPW Drainage Maintenance Subcategories .................................................................................... 6 Table 2-2: OPW Drainage Maintenance Types ..................................................................................................