Office of Public Works Arterial Drainage Maintenance Works – Moy Arterial Drainage Scheme

Stage 1: Appropriate Assessment Screening February 2016

Office of Public Works Main Street Headford Co Galway

JBA Project Manager Jonathan Cooper 24 Grove Island Corbally Limerick Ireland Revision History

Revision Ref / Date Issued Amendments Issued to

Nathy Gilligan, OPW V1.0 / February 2016 Tony Brew, OPW Contract This report describes work commissioned by the Office of Public Works, by a letter dated 05/06/2015. The Office of Public Works’s representative for the contract was Tony Brew. Niamh Sweeney, Tom Sampson and Catalina Herrerar of JBA Consulting carried out this work.

Prepared by ...... Tom Sampson BSc MSc FRGS C.WEM MCIWEM ...... Niamh Sweeney BSc, MSc.

Reviewed by ...... Anne Murray BSc MCIEEM Purpose This document has been prepared as a Draft 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 594g if 100% post-consumer recycled paper is used and 756g 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.

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Executive Summary JBA Consulting has been commissioned by the Office of Public Works (OPW) to provide environmental consultancy services in relation to statutory arterial drainage maintenance activities for 2015. Following the methodology outlined in the Screening Methodology Report (Ryan Hanley, 2014a), this report assesses the likely significant effects on Natura 2000 sites within the zone of influence of the proposed drainage maintenance activities in the Moy 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 have been examined to assess the likely impact of drainage maintenance activities on Natura 2000 sites; surface water, land and air, and groundwater pathways. From this screening exercise it has been determined that significant likely effects may arise on the following Natura 2000 sites as a result of OPW drainage maintenance activities in the Moy Arterial Drainage Scheme. Pathway of Impact Comment Site Surface Land Ground Water and Air water The turlough habitat for which this SAC is designated Balla Turlough SAC could be adversely impacted upon by groundwater (000463) pathways. No impacts via other pathways are anticipated. The Lesser Horseshoe Bat population of this SAC could Ballinafad SAC (002081) potentially be impacted upon in relation to foraging habitat outside the SAC boundary. Potential adverse impacts via all three pathways were identified as a result of the screening exercise. However, Bay/Moy Estuary not all interest features will be impacted upon by each SAC (000458) pathway, depending on whether they are surface water or groundwater dependent features and their location. All interest features of this site, including both the habitats (i.e. bogs, woodlands) and species (i.e. White-clawed SAC (002298) crayfish, Otter, Salmon, lampreys) will potentially be adversely impacted upon via all three pathways. Potential adverse impacts on the wetland bird populations /Moy Estuary of this site via all three pathways were identified as a SPA (004036) result of the screening exercise. Potential adverse impacts on the wetland bird populations and Lough of this site via all three pathways were identified as a Cullin SPA (004228) result of the screening exercise. Potential adverse impacts on surface water dependent habitats and species have been identified ansd are Lough Hoe Bog SAC assumed to be located throughout the SAC and so could (000633) be within 3km upstream of arterial drainage maintenance works. Potential adverse impacts on surface water dependent habitats and species have been identified ansd are Ox Mountains Bogs SAC assumed to be located throughout the SAC and so could (002006) be within 3km upstream of arterial drainage maintenance works. Note: Red = likely significant effect Green = no likely significant effect

GIS files of the screening results by channel and embankment are supplied with this report. The attributes of these files are presented in Appendix B. The impact of OPW drainage maintenance activities in the Moy Arterial Drainage Scheme will therefore need to be subject to further assessment at a Stage 2 Appropriate Assessment.

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Contents

Executive Summary ...... ii 1 Introduction ...... 1 1.1 Background ...... 1 1.2 Legislative Context ...... 1 1.3 Appropriate Assessment Process ...... 1 1.4 Methodology ...... 2 2 Descriptions of Proposals – The Moy Scheme ...... 4 2.1 Background ...... 4 2.2 Drainage Maintenance Activities ...... 4 2.3 The Moy Arterial Drainage Scheme ...... 5 3 Surface Water Pathways ...... 6 3.1 Introduction ...... 6 3.2 Results for the Moy Scheme...... 6 4 Land and Air Pathways ...... 23 4.1 Introduction ...... 23 4.2 Results for the Moy Scheme ...... 23 5 Groundwater Pathways ...... 34 5.1 Introduction ...... 34 5.2 Results for the Moy Scheme...... 34 6 Conclusions ...... 47 Appendices...... I A Maps of Screened In Channels ...... I B Screening Results ...... II

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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) ...... 1 Figure 1-2: Assessment process and relevant report sections ...... 3 Figure 2-1: Map of the Moy Scheme ...... 5 Figure 3-1: Moy Water Management WFD Map...... 7 Figure 3-2: Conn Water Management Unit WFD Map ...... 8 Figure 3-3: Location of Estuaries (1130) within Killala Bay/Moy Estuary SAC (000458), from NPWS, 2012 ...... 13 Figure 3-4: Location of mudflats and sandflats not covered by seawater at low tide (1140) within Killala Bay/Moy Estuary SAC (000458), from NPWS, 2012 ...... 14 Figure 3-5: Location of Saltmarsh Habitats including Salicorna and other colonising mud and sand (1310) within Killala Bay/Moy Estuary SAC (000458) from NPWS 2012...... 15 Figure 3-6: Location of Narrow-Mouthed Whorl Snail Vertigo angustior (1014) within Killala Bay/Moy Estuary SAC (000458), from NPWS 2012 ...... 16 Figure 3-7: Channels and embankments with potential impacts via surface water pathways ...... 22 Figure 4-1: Sand dune habitats within Killala Bay/Moy Estuary SAC (000458) from NPWS 2012 ...... 28 Figure 4-2: Harbour Seal locations within Killala Bay/Moy Estuary SAC (000458) from NPWS 2012 ...... 29 Figure 4-3: Channels and embankments with potential impacts via land and air pathways ...... 33 Figure 5-1: Location of sand dune habitats in Killala Bay / Moy Estuary SAC (000458), from NPWS site synopsis ...... 45 Figure 5-2: Channels and embankments with potential impacts via groundwater pathways ...... 46

List of Tables Table 2-1: OPW Drainage Maintenance Subcategories ...... 4 Table 2-2: OPW Drainage Maintenance Types ...... 4 Table 3-1: Surface Water Pathway - Step 2 ...... 6 Table 3-2: Surface Water Pathway - Step 3 ...... 7 Table 3-3: Surface Water Pathway - Step 4 - WFD Risk Status of Surface Water Bodies in the Moy and Conn water management units ...... 8 Table 3-4: Surface Water Pathway - Step 5 ...... 9 Table 3-5: Surface Water Pathway - Step 6 ...... 9 Table 3-6: Surface Water Pathway - Steps 7 and 8 for Killala Bay/Moy Estuary SAC (000458) ...... 12 Table 3-7: Surface Water Pathway - Steps 7 and 8 for Lough Hoe Bog SAC (000633) ...... 17 Table 3-8: Surface Water Pathway - Steps 7 and 8 for Ox Mountains Bogs SAC (002006) ...... 17

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Table 3-9: Surface Water Pathway - Steps 7 and 8 for River Moy SAC (002298) ...... 17 Table 3-10: Surface Water Pathway - Steps 7 and 8 for SPAs ...... 19 Table 3-8: Surface Water Pathway - Step 9 ...... 21 Table 3-9: Surface Water Pathway - Step 10 ...... 21 Table 4-1: Land & Air Pathway - Step 2 ...... 23 Table 4-2: Land & Air Pathway - Step 3 ...... 24 Table 4-3: Land & Air Pathway - Step 5 ...... 24 Table 4-4: Land & Air Pathway - Step 6 ...... 26 Table 4-5: Land & Air Pathway - Step 8 ...... 30 Table 4-6: Land & Air Pathway - Step 9 ...... 32 Table 5-1: Groundwater Pathway - Step 2 ...... 34 Table 5-2: Groundwater Pathway - Step 3 ...... 36 Table 5-3: Groundwater Pathway - Step 4 ...... 37 Table 5-4: Groundwater Pathway - Step 5 ...... 38 Table 5-5: Groundwater Pathway - Step 6 ...... 39 Table 5-6: Groundwater Pathway - Step 7 – for SACs ...... 41 Table 5-16: Groundwater Pathway - Step 7 - for SPAs ...... 43 Table 5-21: Groundwater Pathway - Step 9 ...... 45 Table 6-1: Conclusions ...... 47

Abbreviations COSD ...... Conservation Objective Supporting Document DEHLG ...... Department of Environment, Heritage and Local Government EPA………………………..Environmental Protection Agency GIS ...... Geographical Information System GWB ...... Groundwater Body GWD ...... Groundwater Dependent IFI ...... Inland Fisheries Ireland IROPI ...... Imperative Reason of Overriding Public Interest NHA ...... Natural Heritage Area NPWS ...... National Parks and Wildlife Service OPW ...... Office of Public Works SAC ...... Special Area of Conservation SPA ...... Special Protection Area SWD ...... Surface Water Dependent WFD……………………….Water Framework Directive

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1 Introduction

1.1 Background JBA Consulting has been commissioned by the Office of Public Works (OPW) to provide environmental consultancy services in relation to statutory arterial drainage maintenance activities for 2014. This report provides the results of the Appropriate Assessment Screening methodology for the Moy arterial drainage scheme. It assesses the likely significant effects on Natura 2000 sites within the zone of influence of the proposed drainage maintenance activities 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).

1.2 Legislative Context The Habitats Directive (Council Directive 92/43/EEC on the conservation of natural habitats and of wild fauna and flora) aims to maintain or restore the favourable conservation status of habitats and species of community interest across . The requirements of this Directive are transposed into Irish law through the European Communities (Birds and Natural Habitats) Regulations) 2011 (S.I. No. 477 of 2011). Under the Directive a network of sites of nature conservation importance have been identified by each Member State as containing specified habitats or species requiring to be maintained or returned to favourable conservation status. In Ireland the network consists of Special Areas of Conservation (SACs) and Special Protection Areas (SPAs), and also candidate sites, which form the Natura 2000 network. Article 6(3) of the Habitats Directive requires that, in relation to European designated sites (i.e. SACs and SPAs that form the Natura 2000 network), "any plan or project not directly connected with or necessary to the management of the site but likely to have a significant effect thereon, either individually or in combination with other plans or projects, shall be subject to appropriate assessment of its implications for the site in view of the site's conservation objectives". A competent authority (e.g. the OPW or Local Authority) can only agree to a plan or project after having determined that it will not adversely affect the integrity of the site concerned. Under article 6(4) of the Directive, if adverse impacts are likely, and in the absence of alternative options, a plan or project must nevertheless proceed for imperative reasons of overriding public interest (IROPI), including social or economic reasons, a Member State is required to take all compensatory measures necessary to ensure the overall integrity of the Natura 2000 site. The European Commission have to be informed of any compensatory measures adopted, unless a priority habitat type or species is present and in which case an opinion from the European Commission is required beforehand (unless for human health or public safety reasons, or of benefit to the environment).

1.3 Appropriate Assessment Process Guidance on the Appropriate Assessment (AA) process was produced by the European Commission in 2002, which was subsequently developed into guidance specifically for Ireland by the Department of Environment, Heritage and Local Government (DEHLG) (2009). These guidance documents identify a staged approach to conducting an AA, as shown Figure 1-1.

Stage 1 Stage 2 Stage 3 Stage 4

Screening for AA AA Alternative Solutions IROPI

Figure 1-1: The Appropriate Assessment Process (from: Appropriate Assessment of Plans and Projects in Ireland - Guidance for Planning Authorities, DEHLG, 2009)

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1.3.1 Stage 1 - Screening for AA The initial, screening stage of the Appropriate Assessment is to determine: a. whether the proposed plan or project is directly connected with or necessary for the management of the European designated site for nature conservation b. if it is likely to have a significant adverse effect on the European designated site, either individually or in combination with other plans or projects For those sites where potential adverse impacts are identified, either alone or in combination with other plans or projects, further assessment is necessary to determine if the proposals will have an adverse impact on the integrity of a European designated site, in view of the sites conservation objectives (i.e. the process proceeds to Stage 2).

1.3.2 Stage 2 - AA This stage requires a more in-depth evaluation of the plan or project, and the potential direct and indirect impacts of them on the integrity and interest features of the European designated site(s), alone and in-combination with other plans and projects, taking into account the site's structure, function and conservation objectives. Where required, mitigation or avoidance measures will be suggested. The competent authority can only agree to the plan or project after having ascertained that it will not adversely affect the integrity of the site(s) concerned. If this cannot be determined, and where mitigation cannot be achieved, then alternative solutions will need to be considered (i.e. the process proceeds to Stage 3).

1.3.3 Stage 3 - Alternative Solutions Where adverse impacts on the integrity of Natura 2000 sites are identified, and mitigation cannot be satisfactorily implemented, alternative ways of achieving the objectives of the plan or project that avoid adverse impacts need to be considered. If none can be found, the process proceeds to Stage 4.

1.3.4 Stage 4 - IROPI Where adverse impacts of a plan or project on the integrity of Natura 2000 sites are identified and no alternative solutions exist, the plan will only be allowed to progress if imperative reasons of overriding public interest (IROPI) can be demonstrated. In this case compensatory measures will be required.

The process only proceeds through each of the four stages for certain plans or projects. For example, for a plan or project, not connected with management of a site, but where no likely significant impacts are identified, the process stops at stage 1. Throughout the process, the precautionary principle must be applied, so that any uncertainties do not result in adverse impacts on a site.

1.4 Methodology This screening assessment has been conducted in line with guidance produced for the OPW in 2013 (Ryan Hanley, 2013a, b and c). This methodology is based on source > pathway > receptor chain principles and involves assessing likely significant effects on Natura 2000 sites within the zone of influence of the proposed drainage maintenance in relation to three pathways: 1. Surface water 2. Land & air 3. Groundwater The screening assessment involves assessing the impacts of drainage maintenance operations within the arterial drainage scheme, and its zone of influence, in relation to each of the three pathways individually. The results of each pathway are then combined in a concluding section to identify if/where likely significant effects may arise.

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Figure 1-2: Assessment process and relevant report sections

Surface water Land & Air Groundwater

Section 3 Section 4 Section 5

Source > Pathway > Receptor Chain Receptor > Pathway > Source

Conclusion

Section 6

The screening process uses a combination of GIS analysis and qualitative assessment to identify which drainage maintenance activities, on which specific watercourses, are likely to have significant effects on the integrity of Natura 2000 sites. This screening report has been produced on currently available information, with the most up-to- date versions used. Where new, or updated, information becomes available the OPW will consider and review this screening assessment if necessary.

1.4.1 Consultation The findings of the screening assessment will be subject to consultation with the National Parks and Wildlife Service (NPWS). Inland Fisheries Ireland (IFI) will also be consulted in relation to fisheries interests within the designated sites and watercourses/embankments where drainage maintenance activities are proposed.

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2 Descriptions of Proposals – The Moy Scheme

2.1 Background Between 1945 and 1995, under the Arterial Drainage Act (1945), the OPW completed 34 Arterial Drainage Schemes on river catchments, along with five estuarine embankment schemes (over 11,500km of channel and 730km of embankments). The OPW is statutorily obligated to maintain arterial drainage channels under the 1945 Arterial Drainage Act, and since their completion, maintenance of these Arterial Drainage Schemes has been ongoing, with the majority of channels maintained every five years. However, larger channels tend to be only maintained every ten years, on average.

2.2 Drainage Maintenance Activities Arterial Drainage Maintenance includes a range of operations such as silt and vegetation management, mowing and structure maintenance, as detailed in Table 2-1, and listed as channel, embankment or structure maintenance in Table 2-2 below. It is required to retain the arterial drainage scheme design capacity. Table 2-1: OPW Drainage Maintenance Subcategories Drainage Maintenance Subcategories

A Silt and vegetation management B Aquatic vegetation cutting C Bank protection D Bush cutting/Branch trimming E Tree cutting F Mulching G Mowing H Gate installation I Sluice maintenance J Bridge maintenance K Other

Table 2-2: OPW Drainage Maintenance Types Category Maintenance Type Code

Silt and vegetation management A Aquatic vegetation cutting B Bank protection C Channel Maintenance Bush cutting/Branch trimming D Tree cutting E Other K Bush cutting/Branch trimming D Tree cutting E Embankment Mulching F Maintenance Mowing G Gate installation H Sluice maintenance I Bridge maintenance J Structural Bank protection C Maintenance Bush cutting/Branch trimming D Tree cutting E

Within the Moy Arterial Drainage Scheme the exact location and type of required maintenance activity varies over time. For the purposes of this screening exercise we have therefore assumed

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that all activities may occur on all Scheme channels, structures and embankments (i.e. following the precautionary principle). In terms of structural maintenance operations it is not currently known where and when maintenance will be required. Therefore, all bridges and associated structures on those watercourses screened into the assessment via each pathway are also screened into the assessment. The list of bridges screened in for each pathway is included in Appendix B.

2.3 The Moy Arterial Drainage Scheme The Moy Arterial Drainage Scheme is located in Co. Mayo and Co. Sligo. It includes 1290km of watercourse and no embankments. Figure 2-1: Map of the Moy Scheme

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3 Surface Water Pathways

3.1 Introduction The following section identifies where surface water pathways may result in drainage maintenance activities in the Moy Arterial Drainage Scheme having a significant effect on Natura 2000 sites.

3.2 Results for the Moy Scheme

3.2.1 Level 1: Characterisation and Initial Impact Assessment It is assumed that none of the proposed drainage maintenance activities in the Moy Arterial Drainage Scheme are directly necessary to the nature conservation management of Natura 2000 sites. Step 1 Each of the drainage maintenance activities detailed in Table 2-1 is proposed in the Moy Arterial Drainage Scheme. Step 2 There are 11 Natura 2000 sites within the same surface water catchment and sub-catchments overlapped by the Moy Arterial Drainage Scheme, as detailed in Table 3-1. Of these nine were identified as having surface water connectivity with the Scheme. Table 3-1: Surface Water Pathway - Step 2 Is site within the same Is there surface water Natura 2000 Site (Site Code) surface water catchment connectivity with the as the scheme? scheme?

Balla Turlough SAC (000463) Yes No Ballinafad SAC (002081) Yes No Bellacorick Bog Complex SAC Yes Yes * (001922) Killala Bay/Moy Estuary SAC Yes Yes (000458) Lough Hoe Bog SAC (000633) Yes Yes Lough Nabrickkeagh Bog SAC Yes Yes * (000634) Owenduff/ Complex SAC Yes Yes * (000534) Ox Mountains Bogs SAC (002006) Yes Yes * River Moy SAC (002298) Yes Yes Killala Bay/Moy Estuary SPA Yes Yes (004036) Lough Conn and SPA Yes Yes (004228) * Natura 2000 sites with surface water connectivity from watercourses upstream of Arterial Drainage Channels.

Two were identified as having no surface water connectivity with the Moy Arterial Drainage Scheme and it was therefore concluded that these Natura 2000 sites cannot be impacted upon by maintenance activities within the Scheme via surface water pathways. Nine Natura 2000 sites remain within the screening assessment. Step 3 2015s2905 AA Screening Moy v1.0 18

The Qualifying Interests/Special Conservation Interests for the remaining nine Natura 2000 sites were obtained from the relevant Conservation Objective document available from the (NPWS) (2014). Table 3-2 below details which of the remaining nine Natura 2000 sites have Qualifying Interests/Special Conservation Interests which can be potentially impacted upon by surface water pathways (i.e. Surface Water Dependent (SWD) Qualifying Interests/Special Conservation Interests). One site contains no SWD Qualifying Interests/Special Conservation Interests, resulting in eight sites remaining in the assessment. Table 3-2: Surface Water Pathway - Step 3 Does the site contain SWD Qualifying Natura 2000 Site Interests/Special Conservation Interests?

Bellacorick Bog Complex SAC (001922) Yes Killala Bay/Moy Estuary SAC (000458) Yes Lough Hoe Bog SAC (000633) Yes Lough Nabrickkeagh Bog SAC (000634) No Owenduff/Nephin Complex SAC (000534) Yes Ox Mountains Bogs SAC (002006) Yes River Moy SAC (002298) Yes Killala Bay/Moy Estuary SPA (004036) Yes Lough Conn and Lough Cullin SPA (004228) Yes

3.2.2 Level 2: Existing Impact Assessment Step 4 The 'At Risk' status (under the Water Framework Directive (WFD) of all surface water bodies within 5km of the Moy Arterial Drainage Scheme was identified, as detailed in Table 3-3. Figure 3-1: Moy Water Management WFD Map

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Figure 3-2: Conn Water Management Unit WFD Map

Table 3-3: Surface Water Pathway - Step 4 - WFD Risk Status of Surface Water Bodies in the Moy and Conn water management units Water Management Unit No. of Channels Status

24 High 54 Good Moy 21 Moderate 11 Poor 2 Bad 25 High 60 Good Conn 14 Moderate 5 Poor 0 Bad

3.2.3 Level 3: Potential Impact and Significance Assessment Step 5 This stage determines whether there is potential for proposed drainage maintenance activities within a scheme to effect Natura 2000 site(s) within the surface water catchment; this is based on the hydrological setting (i.e. marine, estuarine, freshwater). This is assessed from a matrix of pre-determined distances and typologies (i.e. upstream or downstream) which define the zone of influence within which effects can potentially occur within each type of setting (Ryan Hanley, 2014a). The results of this are summarised in Table 3-4.

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Table 3-4: Surface Water Pathway - Step 5 Drainage maintenance activity Hydrological location relative to Natura 2000 Natura 2000 Site Result Setting site boundary Downstream Upstream Overlap Bellacorick Bog No Potential Complex SAC Freshwater >3 km None None Effect (001922) Killala Bay/Moy Estuary SAC Estuarine N/A <3 km Yes Potential Effect (000458) Lough Hoe Bog Freshwater <3 km None None Potential Effect SAC (000633) Owenduff/Nephin No Potential Complex SAC Freshwater >5 km None None Effect (000534) Ox Mountains Bogs SAC Freshwater <3 km None None Potential Effect (002006) River Moy SAC Freshwater <3 km <5 km Yes Potential Effect (002298) Killala Bay/Moy Estuary SPA Estuarine N/A <3 km Yes Potential Effect (004036) Lough Conn and Lough Cullin SPA Freshwater <3 km <5 km Yes Potential Effect (004228)

Freshwater Pearl Mussel has not been included as a hydrological setting as it is not a qualifying interest for any of the Natura 2000 sites assessed at this stage.

Step 6 Relevant information relating to each of the remaining Natura 2000 sites, including the Conservation Objectives Supporting Document, Site Synopsis and Natura 2000 Standard Data Form, were then reviewed to identify the potential for pressures and threats and related cumulative and in-combination effects. The results of this assessment are detailed in Table 3-5. Table 3-5: Surface Water Pathway - Step 6 Potential for Presence of Pressure/ or Cumulative Pressures or surface Natura 2000 Site Threat Codes Impact and In- Threats water from Article 17 combination pathways Effects Invasive non-native Yes I01 species Outdoor sports and leisure activities, Potential recreational activities - Killala Bay/Moy Effect Walking, horseriding No G01.02 Estuary SAC and non-motorised (000458) Proceed to vehicles (inside & Step 7 outside N2000 site) Modification of Yes A02 cultivation practices Leisure fishing Yes F02.03

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Potential for Presence of Pressure/ or Cumulative Pressures or surface Natura 2000 Site Threat Codes Impact and In- Threats water from Article 17 combination pathways Effects (positive & negative impact) Urbanised areas, No E01 human habitation Sports and leisure structures - Camping No G02.08 and caravans Sports and leisure structures – Golf No G02.01 course Agriculture - grazing No A04 Urbanised areas, human habitation – dispersed habitation No E01.03 (inside and outside N2000 site, positive & negative impacts) Abiiotic natural No K01.01 processes – erosion Human induced changes in hydraulic Yes J02 conditions Roads, paths and railroads – paths, tracks, cycling tracks No D01.01 (positive & negative impacts) Peat extraction – mechanical removal No C01.03.02 of peat (inside and Potential outside N2000 site) Effect Lough Hoe Bog Leisure fishing Yes F02.03 SAC (000633) Hunting No F03.01 Proceed to Peat extraction – Step 7 hand cutting of peat No C01.03.01 (inside and outside N2000 site) Agriculture - grazing No A04 Utility and service lines – electricity and No D02.01 phone lines Discharges Yes E03 Roads, paths and railroads – roads, No D01.02 motorways (positive & negative impacts) Sylviculture, forestry No B Biocentric evolution, succession – accumulation of Yes K02.02 organic material (positive impact) Agriculture – grazing (inside and outside No A04 N2000 site, positive & Potential Ox Mountains negative impact) Effect * Bogs SAC Sylviculture, forestry – (002006) Proceed to forest planting on No B01 Step 7 open ground Peat extraction – No C01.03.02 2015s2905 AA Screening Moy v1.0 18

Potential for Presence of Pressure/ or Cumulative Pressures or surface Natura 2000 Site Threat Codes Impact and In- Threats water from Article 17 combination pathways Effects mechanical removal of peat (inside and outside N2000 site) Improved access to No D05 site Abiiotic natural No K01.01 processes – erosion Roads, paths and railroads – roads, No D01.02 motorways (positive & negative impacts) Peat extraction – hand cutting of peat No C01.03.01 (inside and outside N2000 site) Agriculture – mowing, cutting of grassland No A03 (inside and outside N2000 site) Hunting (positive and No F03.01 negative impact) Agriculture – grazing (inside and outside No A04 N2000 site, positive & negative impact) Agriculture – fertilisation (inside and No A08 outside N2000 site) Sylviculture, forestry (inside and outside No B N2000 site) Potential Fire and fire Effect River Moy SAC No J01 suppression (002298) Invasive non-native Proceed to Yes I01 species Step 7 Urbanised areas, human habitation – dispersed habitation No E01.03 (outside N2000 site, positive & negative impacts) Leisure fishing (positive & negative Yes F02.03 impacts) Peat extraction No C01.03 Urbanised areas, human habitation (inside and outside No E01 N2000 site, positive & negative impacts) Agriculture – No A08 fertilisation Leisure fishing Potential (positive & negative Yes F02.03 Killala Bay/Moy Effect impacts) Estuary SPA (004036) Outdoor sports and Proceed to leisure activities, Step 7 recreational activities - No G01.02 Walking, horseriding and non-motorised

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Potential for Presence of Pressure/ or Cumulative Pressures or surface Natura 2000 Site Threat Codes Impact and In- Threats water from Article 17 combination pathways Effects vehicles Urbanised areas, No E01 human habitation Agriculture – No A08 fertilisation Potential Sylviculture, forestry No B Lough Conn and Effect Leisure fishing Lough Cullin SPA (positive & negative Yes F02.03 (004228) Proceed to impacts) Step 7 Invasive non-native Yes I01 species Note: * proceeding under the precautionary principle as no pressure or threats with a complete source-pathway- receptor chain via surface water pathway were identified,

Steps 7 and 8 These stages involved examining the SWD Qualifying Interests/Special Conservation Interests for each of the remaining 'screened in' Natura 2000 sites to identify which may potentially be impacted upon by drainage maintenance activities. This was done using a set of pre-determined buffer zones derived for each individual habitat and species, within which effects can potentially occur (Ryan Hanley, 2014a). The location of the Natura 2000 site for these stages is also important, depending on whether it is downstream, upstream or overlaps the Scheme as this situation may allow some Qualifying Interests/Special Conservation Interests to be screened out. Information, including from the Conservation Objectives, was also reviewed to determine the location of the drainage maintenance activities relative to the SWD Qualifying Interests/Special Conservation Interests. Where no information on the location of SWD Qualifying Interests/Special Conservation Interests was available, the precautionary principle was applied and the Qualifying Interests/Special Conservation Interests were screened in. Table 3-6 summarises the results of this stage for the remaining SACs and

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Table 3-10 provides the results for the remaining SPAs. Table 3-6: Surface Water Pathway - Steps 7 and 8 for Killala Bay/Moy Estuary SAC (000458)

SWD Qualifying Drainage Activity location EU Interest/Special relative to SWD Qualifying Desktop Study Comment Conclusion Code Conservation interest Interest Downstream Upstream Overlap Killala Bay/Moy Estuary SAC (000458) Estuary habitat overlaps and is within 3km downstream of Potential 1130 Estuaries None <3 km Yes Arterial Drainage channels. Effect See Figure 3-3 from Site Synopsis (NPWS, 2012) Location of habitat overlaps and is within 3km Mudflats and sandflats downstream of Arterial Potential 1140 not covered by None <3 km Yes Drainage channels. See Effect seawater at low tide Figure 3-4 from Site Synopsis (NPWS, 2012) Location is within 3km downstream of Arterial Drainage channels. See Salicornia and other Figure 3-5 from Site Potential 1310 annuals colonising mud None <3 km No Synopsis (NPWS, 2012). Effect and sand Surface water dependant habitat has potential effects from upstream activity within the zone of influence. Located downstream of works on same side of Narrow-mouthed Whorl Potential 1014 None <3 km Potential estuary as Channel C1/3. Snail Vertigo angustior Effect See Figure 3-6 from Site Synopsis (NPWS, 2012). Assumed to be located throughout SAC. Surface Sea Lamprey water dependant species has Potential 1095 None <3 km Yes Petromyzon marinus potential effects from Effect upstream activity within the zone of influence.

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Figure 3-3: Location of Estuaries (1130) within Killala Bay/Moy Estuary SAC (000458), from NPWS, 2012

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Figure 3-4: Location of mudflats and sandflats not covered by seawater at low tide (1140) within Killala Bay/Moy Estuary SAC (000458), from NPWS, 2012

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Figure 3-5: Location of Saltmarsh Habitats including Salicorna and other colonising mud and sand (1310) within Killala Bay/Moy Estuary SAC (000458) from NPWS 2012

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Figure 3-6: Location of Narrow-Mouthed Whorl Snail Vertigo angustior (1014) within Killala Bay/Moy Estuary SAC (000458), from NPWS 2012

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Table 3-7: Surface Water Pathway - Steps 7 and 8 for Lough Hoe Bog SAC (000633)

SWD Qualifying Drainage Activity location EU Interest/Special relative to SWD Qualifying Desktop Study Comment Conclusion Code Conservation interest Interest Downstream Upstream Overlap Lough Hoe Bog SAC (000633) Assumed to be located Oligotrophic waters throughout SAC. Surface water containing very few Potential 3110 <3 km None None dependant habitat has potential minerals of sandy plains Effect effects from downstream activity (Littorelletalia uniflorae) within the zone of influence. Assumed to be located throughout SAC. Surface water Geyer's Whorl Snail Potential 1013 <3 km None None dependant species has potential Vertigo geyeri Effect effects from downstream activity within the zone of influence. Assumed to be located throughout SAC. Surface water White-clawed Crayfish No dependant species has no 1092 Austropotamobius <3 km None None Potential potential effects from pallipes Effect downstream activity within the zone of influence.

Table 3-8: Surface Water Pathway - Steps 7 and 8 for Ox Mountains Bogs SAC (002006)

SWD Qualifying Drainage Activity location EU Interest/Special relative to SWD Qualifying Desktop Study Comment Conclusion Code Conservation interest Interest Downstream Upstream Overlap Ox Mountains Bogs SAC (002006) Assumed to be located Oligotrophic waters throughout SAC. Surface water containing very few Potential 3110 <3 km None None dependant habitat has potential minerals of sandy plains Effect effects from downstream activity (Littorelletalia uniflorae) within the zone of influence. Assumed to be located throughout SAC. Surface water Natural dystrophic lakes Potential 3160 <3 km None None dependant habitat has potential and ponds Effect effects from downstream activity within the zone of influence. Assumed to be located throughout SAC. Surface water Geyer's Whorl Snail Potential 1013 <3 km None None dependant species has potential Vertigo geyeri Effect effects from downstream activity within the zone of influence.

Table 3-9: Surface Water Pathway - Steps 7 and 8 for River Moy SAC (002298)

SWD Qualifying Drainage Activity location EU Interest/Special relative to SWD Qualifying Desktop Study Comment Conclusion Code Conservation interest Interest Downstream Upstream Overlap River Moy SAC (002298)

Assumed to be located Potential 7230 Alkaline fens <5 km <5 km Yes throughout SAC. Effect Alluvial forests with Assumed to be located Potential 91E0 Alnus glutinosa and <5 km <5 km Yes throughout SAC. Effect Fraxinus excelsior

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SWD Qualifying Drainage Activity location EU Interest/Special relative to SWD Qualifying Desktop Study Comment Conclusion Code Conservation interest Interest Downstream Upstream Overlap (Alno-Padion, Alnion incanae, Salicion albae White-clawed Crayfish Assumed to be located Potential 1092 Austropotamobius <5 km <5 km Yes throughout SAC. Effect pallipes Sea Lamprey Assumed to be located Potential 1095 <5 km <5 km Yes Petromyzon marinus throughout SAC. Effect Brook Lamprey Assumed to be located Potential 1096 <5 km <5 km Yes Lampetra planeri throughout SAC. Effect Assumed to be located Potential 1106 Salmon Salmo salar <5 km <5 km Yes throughout SAC. Effect Assumed to be located Potential 1355 Otter Lutra lutra <5 km <5 km Yes throughout SAC. Effect

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Table 3-10: Surface Water Pathway - Steps 7 and 8 for SPAs Drainage maintenance activity SWD habitats Special Conservation location relative to SWD Special Annex I Habitat Desktop Study Comment Conclusion present Interest likely to occur Conservation Interests Downstream Upstream Overlap Killala Bay/Moy Estuary SPA (004036) CC1: Sea walls Reefs (1170) piers and jetties; Grey Plover (A141)

CS1: Rocky sea Sanderling (A144) Population data (numbers, foraging Mudflats and sandflats cliffs; LS1: Shingle Dunlin (A149) distribution and roosting distribution) for not covered by sea water and gravel shores; Bar-tailed Godwit waterbird SCI species of Killala Bay/Moy Potential for at low tide (1140) LS2: Sand shores; (A157) N/A <3 km No Estuary SPA show activity throughout the Likely Significant

LS3: Muddy sand Curlew (A160) area of the SPA. Please refer to NPWS Effect Salicornia and other shores; Redshank (A162) (2013) for population data on individual annuals colonizing mud LS4: Mud shores; Wetland and Waterbirds species. and sand (1310) LS5: Mixed (A999)

sediment shores Grey Plover (A141) Population data (numbers, foraging Estuaries (1130) Golden Plover (A140) distribution and roosting distribution) for MW4: Estuaries; Dunlin (A149) waterbird SCI species of Killala Bay/Moy Potential for MW2: Sea inlets Large shallow inlets and Curlew (A160) N/A <3 km No Estuary SPA show activity throughout the Likely Significant and bays; CW2: bays (1160) Redshank (A162) area of the SPA. Please refer to NPWS Effect Tidal rivers Wetland and Waterbirds (2013) for population data on individual (A999) species. Coastal lagoons (1150) Population data (numbers, foraging Golden Plover (A140) MW2: Sea inlets Atlantic salt meadows distribution and roosting distribution) for Dunlin (A149) and bays; MW4: (Glauco-Puccinellietalia waterbird SCI species of Killala Bay/Moy Potential for Curlew (A160) Estuaries; CM1: maritimae) (1330) N/A <3 km No Estuary SPA show activity throughout the Likely Significant Redshank (A162) Lower salt marsh; area of the SPA. Please refer to NPWS Effect Wetland and Waterbirds Mediterranean salt (2013) for population data on individual (A999) meadows (Juncetalia species. maritimi) (1410) Sandbanks which are Population data (numbers, foraging Potential for Wetland and Waterbirds CD3: Fixed dunes slightly covered by N/A <3 km No distribution and roosting distribution) for Likely Significant (A999) seawater all the time waterbird SCI species of Killala Bay/Moy Effect

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Drainage maintenance activity SWD habitats Special Conservation location relative to SWD Special Annex I Habitat Desktop Study Comment Conclusion present Interest likely to occur Conservation Interests Downstream Upstream Overlap (1110) Estuary SPA show activity throughout the area of the SPA. Please refer to NPWS (2013) for population data on individual species. Lough Conn and Lough Cullin SPA (004228)

Watercourses of plain to montane levels with the Ranunculion fluitantis and Callitricho-Batrachion vegetation (3260) FW2: Depositing Tufted Duck (A061) lowland rivers; Hard oligo-mesotrophic

FL2: Acid waters with benthic Common Scoter (A065) oligotrophic lakes; vegetation of Chara sp. Details of the usage of and breeding

FL4: Mesotrophic (3140) areas of the SCIs of Lough Conn and Common Gull (A182) Potential for lake; Lough Cullin SPA are given in NPWS <3 km <3km Yes Likely Significant FS1: Reed and Oligotrophic to (2010) and Greenland White- Effect large sedge mesotrophic standing Hunt et al. (2013). The SPA is actively fronted Goose (A395) swamps; waters with vegetation of used by SCIs throughout it’s area.

FS2: Tall-herb the Littorelletea uniflorae Wetland and Waterbirds swamps and/or of the Isoeto- [A999] Namojuncetea (3130)

Hydrophilous tall herb fringe communities of plains and of the montane to alpine levels (6430)

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Step 9 A review of the attributes and targets for the SWD Qualifying Interests/Special Conservation Interests has identified that there is potential for significant effects on Qualifying Interests/Special Conservation Interests in the following Natura 2000 sites. Table 3-11: Surface Water Pathway - Step 9 Potential for Effects Potential for Likely Natura 2000 Site Based on Attributes Significant Effects

Killala Bay/Moy Estuary SAC (000458) Yes Yes Lough Hoe Bog SAC (000633) Yes Yes Ox Mountains Bogs SAC (002006) Yes Yes River Moy SAC (002298) Yes Yes Killala Bay/Moy Estuary SPA (004036) Yes Yes Lough Conn and Lough Cullin SPA Yes Yes (004228)

Step 10 In conclusion, the above steps have determined that the following Natura 2000 sites will require a Stage 2 Appropriate Assessment to be undertaken and the preparation of a Natura Impact Statement. However, if more data becomes available, further site specific investigations can be undertaken and this screening conclusion re-assessed. Table 3-12: Surface Water Pathway - Step 10 Potential for Likely Potential for Natura 2000 Site Significant Effects Cumulative Impacts must be considered must be considered

Killala Bay/Moy Estuary SAC (000458) Yes Yes Lough Hoe Bog SAC (000633) Yes Yes Ox Mountains Bogs SAC (002006) Yes Yes River Moy SAC (002298) Yes Yes Killala Bay/Moy Estuary SPA (004036) Yes Yes Lough Conn and Lough Cullin SPA Yes Yes (004228)

The screened in channel and embankment sections (and the bridges within these sections) in the Moy Arterial Drainage Scheme are shown on the map below, and tabulated in Appendix A.

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Figure 3-7: Channels and embankments with potential impacts via surface water pathways

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4 Land and Air Pathways

4.1 Introduction The following section of this report examines the land and air pathways which may arise due to drainage maintenance activities in the Moy Arterial Drainage Scheme. The impacts of these pathways, if any, on Natura 2000 sites is then assessed.

4.2 Results for the Moy Scheme

4.2.1 Level 1: Characterisation and Initial Impact Assessment It is assumed that none of the proposed drainage maintenance activities in the Moy Arterial Drainage Scheme are directly necessary to the nature conservation management of Natura 2000 sites. Step 1 Each of the drainage maintenance activities detailed in Table 2-1 is proposed in the Moy Arterial Drainage Scheme. Step 2 There are five Natura 2000 sites within 0.01km and 25 Natura 2000 sites located within 0.6km of the Scheme, as detailed in Table 4-1. Table 4-1: Land & Air Pathway - Step 2 Natura 2000 Site Name 0.6km Buffer Zone 0.01km (Overlap) (Site Code)

Indirect impacts for noise and Direct impacts from physical Type of Impact visual disturbance through air disturbance of habitats pathways through land pathways Balla Turlough SAC (000463) No No Ballinafad SAC (002081) Yes No Bellacorick Bog Complex No No SAC (001922) Killala Bay/Moy Estuary SAC Yes Yes (000458) Lough Hoe Bog SAC No No (000633) Lough Nabrickkeagh Bog No No SAC (000634) Owenduff/Nephin Complex No No SAC (000534) Ox Mountains Bogs SAC No No (002006) River Moy SAC (002298) Yes Yes Killala Bay/Moy Estuary SPA Yes Yes (004036) Lough Conn and Lough Yes Yes Cullin SPA (004228)

Step 3 The Qualifying Interests/Special Conservation Interests for each Natura 2000 site were obtained from the relevant Conservation Objective document available from the NPWS (2014). Table 4-2 below details which of the five Natura 2000 sites identified in Table 4-1 above have Qualifying

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Interests/Special Conservation Interests which can be potentially impacted upon by land and air pathways. Table 4-2: Land & Air Pathway - Step 3 Natura 2000 Site Presence of Land and Air Pathways

Ballinafad SAC (002081) Yes Killala Bay/Moy Estuary SAC (000458) Yes River Moy SAC (002298) Yes Killala Bay/Moy Estuary SPA (004036) Yes Lough Conn and Lough Cullin SPA (004228) Yes Note: Turloughs are not listed in Matrix 3.1 in Ryan Hanley (2014a) however it is considered possible that they could be impacted upon via land and air pathways despite not being included in the assessment methodology in this respect. Consequently, the zones of influence relating to alkaline fens have also been applied to this habitat type in this assessment.

4.2.2 Level 2: Existing Impact Assessment Step 4 Not applicable to this pathway.

4.2.3 Level 3: Potential Impact and Significance Assessment Step 5 This stage assesses whether there is potential for a drainage maintenance activity to affect the Qualifying Interests/Special Conservation Interests of the Natura 2000 site(s) within the zone of influence of a scheme. This is determined from a set of pre-established distances for each individual habitat and species within which effects can potentially occur (Ryan Hanley, 2014a). The results of this are summarised in Table 4-3. Table 4-3: Land & Air Pathway - Step 5 Drainage maintenance EU activity location relative to Location of Species/Habitats Result Code qualifying interest/ special Impact conservation interest Ballinafad SAC (002081) Lesser Horshoe Bat MAC/BR 1303 <0.6 km Potential effect Rhinolophus hipposideros +5 km Killala Bay/Moy Estuary SAC (000458) Narrow‐mouthed Whorl Snail 1014 0km / Overlap MAC Potential effect Vertigo angustior Sea Lamprey Petromyzon 1095 0km / Overlap INST <50m Potential effect marinus 1130 Estuaries 0km / Overlap <10m Potential effect Mudflats and sandflats not 1140 covered by seawater at low 0km / Overlap <10m Potential effect tide 1210 Annual vegetation of drift lines 0km / Overlap <10m Potential effect Salicornia and other annuals 1310 0km / Overlap <10m Potential effect colonizing mud and sand Atlantic salt meadows 1330 Glauco‐Puccinellietalia 0km / Overlap <10m Potential effect maritimae 1365 Harbour Seal Phoca vitulina 0km / Overlap <150m Potential effect 2110 Embryonic shifting dunes 0km / Overlap <10m Potential effect Shifting dunes along the 0km / Overlap 2120 shoreline with Ammophila <10m Potential effect arenaria ('white dunes') *Fixed coastal dunes with 0km / Overlap 2130 herbaceous vegetation ('grey <10m Potential effect dunes') 2190 Humid dune slacks 0km / Overlap <10m Potential effect 2015s2905 AA Screening Moy v1.0 13

Drainage maintenance EU activity location relative to Location of Species/Habitats Result Code qualifying interest/ special Impact conservation interest River Moy SAC (002298) 7110 Active raised bogs* 0km / Overlap < 10m Potential effect Degraded raised bogs still 0km / Overlap 7120 < 10m Potential effect capable of natural regeneration Depressions on peat 0km / Overlap 7150 substrates of the < 10m Potential effect Rhynchosporion 7230 Alkaline fens 0km / Overlap < 10m Potential effect Old sessile oak woods with Ilex 0km / Overlap 91A0 and Blechnum in the British < 10m Potential effect Isles Alluvial forests with Alnus 0km / Overlap glutinosa and Fraxinus 91E0 < 10m Potential effect excelsior (Alno-Padion, Alnion incanae, Salicion albae)* White-clawed Crayfish 0km / Overlap 1092 INST / <50m Potential effect Austropotamobius pallipes Sea Lamprey 0km / Overlap 1095 INST / <50m Potential effect Petromyzon marinus Brook Lamprey 0km / Overlap 1096 INST / <50m Potential effect Lampetra planeri Salmon 0km / Overlap 1106 INST Potential effect Salmo salar Otter 0km / Overlap INST / 1355 Potential effect Lutra lutra <150m Killala Bay/Moy Estuary SPA (004036) Wetlands 0km / Overlap INST / MAC A999 Potential effect +10m Ringed Plover Charadrius 0km / Overlap A137 MAC +100m Potential effect hiaticula Golden Plover Pluvialis 0km / Overlap A140 MAC +200m Potential effect apricaria Grey Plover Pluvialis 0km / Overlap A141 MAC +100m Potential effect squatarola A144 Sanderling Calidris alba 0km / Overlap MAC +100m Potential effect A149 Dunlin Calidris alpina alpina 0km / Overlap MAC +100m Potential effect Bar-tailed Godwit Limosa 0km / Overlap A157 MAC +100m Potential effect lapponica A160 Curlew Numenius arquata 0km / Overlap MAC +500m Potential effect A162 Redshank Tringa totanus 0km / Overlap MAC +100m Potential effect Lough Conn and Lough Cullin SPA (004228) A061 Tufted Duck Aythya fuligula 0km / Overlap MAC +100m Potential effect Common Scoter Melanitta 0km / Overlap A065 MAC +300m Potential effect nigra A182 Common Gull Larus canus 0km / Overlap MAC +100m Potential effect Greenland White-fronted 0km / Overlap A395 Goose Anser albifrons MAC +600m Potential effect flavirostris 0km / Overlap INST / MAC A999 Wetlands Potential effect +10m Notes: MAC = Maintenance Access Corridor BR = Bridge INST = Instream

Step 6 Relevant information relating to each Natura 2000 site, including the Conservation Objectives Supporting Document, Site Synopsis and Natura 2000 Standard Data Form, were then reviewed 2015s2905 AA Screening Moy v1.0 14

to identify the potential for pressures and threats and related cumulative and in-combination effects. The results of this assessment are detailed in Table 4-4. Table 4-4: Land & Air Pathway - Step 6 Potential for Presence of Pressure/ or Cumulative Pressures or Natura 2000 Site land and air Threat Codes Impact and In- Threats pathways from Article 17 combination Effects Invasive non-native No I01 species Outdoor sports and leisure activities, recreational activities - Walking, horseriding Yes G01.02 and non-motorised vehicles (inside & outside N2000 site) Modification of Yes A02 Potential Killala Bay/Moy cultivation practices Effect Estuary SAC Leisure fishing (000458) (positive & negative Yes F02.03 Proceed to impact) Step 7 Urbanised areas, Yes E01 human habitation Sports and leisure structures - Camping Yes G02.08 and caravans Sports and leisure structures – Golf Yes G02.01 course Agriculture - grazing Yes A04 Potential Effect Ballinafad SAC Abiotic (slow) natural Yes K01.01 (002081) processes – erosion Proceed to Step 7 Agriculture – mowing, cutting of grassland Yes A03 (inside and outside N2000 site) Hunting (positive and Yes F03.01 negative impact) Agriculture – grazing (inside and outside Yes A04 N2000 site, positive & negative impact) Agriculture – fertilisation (inside and Yes A08 outside N2000 site) Potential Effect River Moy SAC Sylviculture, forestry

(002298) (inside and outside Yes B Proceed to N2000 site) Step 7 Fire and fire Yes J01 suppression Invasive non-native No I01 species Urbanised areas, human habitation – dispersed habitation Yes E01.03 (outside N2000 site, positive & negative impacts) Leisure fishing Yes F02.03 (positive & negative 2015s2905 AA Screening Moy v1.0 15

Potential for Presence of Pressure/ or Cumulative Pressures or Natura 2000 Site land and air Threat Codes Impact and In- Threats pathways from Article 17 combination Effects impacts) Peat extraction Yes C01.03 Urbanised areas, human habitation (inside and outside Yes E01 N2000 site, positive & negative impacts) Agriculture – Yes A08 fertilisation Leisure fishing (positive & negative Yes F02.03 impacts) Potential Killala Bay/Moy Outdoor sports and Effect Estuary SPA leisure activities, (004036) recreational activities - Proceed to Yes G01.02 Walking, horseriding Step 7 and non-motorised vehicles Urbanised areas, Yes E01 human habitation Agriculture – Yes A08 fertilisation Potential Sylviculture, forestry Yes B Lough Conn and Effect Leisure fishing Lough Cullin SPA (positive & negative Yes F02.03 (004228) Proceed to impacts) Step 7 Invasive non-native No I01 species Note: * proceeding under the precautionary principle as no pressure or threats with a complete source-pathway- receptor chain via land and air pathways were identified,

Step 7 Not applicable to this pathway. Step 8 As part of this step, further information on the following sites was collected to determine the location of drainage maintenance activities relative to the Qualifying Interests/Special Conservation Interests of each site, to determine if they are located in or outside of the zone of influence:  The site synopsis report for Killala Bay/Moy Estuary SAC (000458) contains details on the location of habitats, which have been used to inform the zones of influence.

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Figure 4-1: Sand dune habitats within Killala Bay/Moy Estuary SAC (000458) from NPWS 2012

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Figure 4-2: Harbour Seal locations within Killala Bay/Moy Estuary SAC (000458) from NPWS 2012

Where no information on the location of Qualifying Interests/Special Conservation Interests was available, the precautionary principle was applied and the Qualifying Interests/Special Conservation Interests were screened in, given their unknown location. The results are given in Table 4-5 below.

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Table 4-5: Land & Air Pathway - Step 8 Qualifying Maintenance Interest/Special activity location EU Conservation Interests Location of Species/Habitats relative to Result Code location relative to Impact Natura 2000 drainage maintenance site boundary activity Ballinafad SAC (002081) Assumed throughout Lesser Horshoe Bat Natura 2000 site and MAC/BR +5 Potential 1303 Rhinolophus <0.6 km beyond site boudnaries km significant effect hipposideros within the 0.6km zone of influence. Killala Bay/Moy Estuary SAC (000458) Narrow‐mouthed 0km / Overlap (see Potential 1014 Whorl Snail Vertigo 0km / Overlap MAC Figure 3-6) significant effect angustior Sea Lamprey Potential 1095 0km / Overlap 0km / Overlap INST <50m Petromyzon marinus significant effect 0km / Overlap (see Potential 1130 Estuaries 0km / Overlap <10m Figure 3-3) significant effect Mudflats and sandflats not covered 0km / Overlap (see Potential 1140 0km / Overlap <10m by seawater at low Figure 3-4) significant effect tide Located outside of 10m Annual vegetation of zone of influence for land 1210 0km / Overlap None No impact drift lines and air impacts (see Figure 4-1) Located outside of 10m Salicornia and other zone of influence for land 1310 annuals colonizing 0km / Overlap None No impact and air impacts (see mud and sand Figure 3-5) Atlantic salt meadows 0km / Overlap (see Potential 1330 Glauco‐Puccinellietali 0km / Overlap <10m Figure 3-5) significant effect a maritimae Potential seal activity Harbour Seal Phoca within 150m of arterial Potential 1365 0km / Overlap <150m vitulina drainage channels significant effect (seeFigure 4-2) Located outside of 10m Embryonic shifting zone of influence for land 2110 0km / Overlap None No impact dunes and air impacts (see Figure 4-1) Shifting dunes along Located outside of 10m the shoreline with zone of influence for land 2120 0km / Overlap None No impact Ammophila arenaria and air impacts (see ('white dunes') Figure 4-1) *Fixed coastal dunes Located outside of 10m with herbaceous zone of influence for land 2130 0km / Overlap None No impact vegetation ('grey and air impacts (see dunes') Figure 4-1) Located outside of 10m zone of influence for land 2190 Humid dune slacks 0km / Overlap None No impact and air impacts (see Figure 4-1) River Moy SAC (002298) 0km / Overlap Assumed throughout the Potential 7110 Active raised bogs* < 10m N2000 site significant effect Degraded raised bogs 0km / Overlap Assumed throughout the Potential 7120 still capable of natural < 10m N2000 site significant effect regeneration Depressions on peat 0km / Overlap Assumed throughout the Potential 7150 substrates of the < 10m N2000 site significant effect Rhynchosporion 7230 Alkaline fens 0km / Overlap Assumed throughout the < 10m Potential 2015s2905 AA Screening Moy v1.0 19

Qualifying Maintenance Interest/Special activity location EU Conservation Interests Location of Species/Habitats relative to Result Code location relative to Impact Natura 2000 drainage maintenance site boundary activity N2000 site significant effect Old sessile oak woods 0km / Overlap with Ilex and Assumed throughout the Potential 91A0 < 10m Blechnum in the N2000 site significant effect British Isles Alluvial forests with 0km / Overlap Alnus glutinosa and Fraxinus excelsior Assumed throughout the Potential 91E0 < 10m (Alno-Padion, Alnion N2000 site significant effect incanae, Salicion albae)* White-clawed Crayfish 0km / Overlap Assumed throughout the Potential 1092 Austropotamobius INST / <50m N2000 site significant effect pallipes Sea Lamprey 0km / Overlap Assumed throughout the Potential 1095 INST / <50m Petromyzon marinus N2000 site significant effect Brook Lamprey 0km / Overlap Assumed throughout the Potential 1096 INST / <50m Lampetra planeri N2000 site significant effect Salmon 0km / Overlap Assumed throughout the Potential 1106 INST Salmo salar N2000 site significant effect Otter 0km / Overlap Assumed throughout the INST / Potential 1355 Lutra lutra N2000 site <150m significant effect Killala Bay/Moy Estuary SPA (004036) Wetlands 0km / Overlap Assumed throughout the INST / MAC Potential A999 N2000 site +10m significant effect Ringed Plover 0km / Overlap Assumed throughout the Potential A137 MAC +100m Charadrius hiaticula N2000 site significant effect Golden Plover 0km / Overlap Assumed throughout the Potential A140 MAC +200m Pluvialis apricaria N2000 site significant effect Grey Plover Pluvialis 0km / Overlap Assumed throughout the Potential A141 MAC +100m squatarola N2000 site significant effect Sanderling Calidris 0km / Overlap Assumed throughout the Potential A144 MAC +100m alba N2000 site significant effect Dunlin Calidris alpina 0km / Overlap Assumed throughout the Potential A149 MAC +100m alpina N2000 site significant effect Bar-tailed Godwit 0km / Overlap Assumed throughout the Potential A157 MAC +100m Limosa lapponica N2000 site significant effect Curlew Numenius 0km / Overlap Assumed throughout the Potential A160 MAC +500m arquata N2000 site significant effect Redshank Tringa 0km / Overlap Assumed throughout the Potential A162 MAC +100m totanus N2000 site significant effect Lough Conn and Lough Cullin SPA (004228) Tufted Duck Aythya 0km / Overlap Assumed throughout the Potential A061 MAC +100m fuligula N2000 site significant effect Common Scoter 0km / Overlap Assumed throughout the Potential A065 MAC +300m Melanitta nigra N2000 site significant effect Common Gull Larus 0km / Overlap Assumed throughout the Potential A182 MAC +100m canus N2000 site significant effect Greenland White- 0km / Overlap Assumed throughout the Potential A395 fronted Goose Anser MAC +600m N2000 site significant effect albifrons flavirostris 0km / Overlap Assumed throughout the INST / MAC Potential A999 Wetlands N2000 site +10m significant effect Notes: MAC = Maintenance Access Corridor BR = Bridge INST = Instream

Step 9

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A review of the attributes and targets for the Qualifying Interests/Special Conservation Interests has identified that there is potential for significant effects on Qualifying Interests/Special Conservation Interests in the following Natura 2000 sites. Table 4-6: Land & Air Pathway - Step 9 Potential for Effects Potential for Likely Natura 2000 Site Based on Attributes Significant Effects

Ballinafad SAC (002081) Yes Yes Killala Bay/Moy Estuary SAC (000458) Yes Yes River Moy SAC (002298) Yes Yes Killala Bay/Moy Estuary SPA (004036) Yes Yes Lough Conn and Lough Cullin SPA (004228) Yes Yes

Step 10 The following Natura 2000 sites will require a Stage 2 Appropriate Assessment to be undertaken and the preparation of a Natura Impact Statement or further site specific investigations, if more data becomes available. Potential for Likely Potential for Natura 2000 Site Significant Effects Cumulative Impacts must be considered must be considered

Ballinafad SAC (002081) Yes Yes Killala Bay/Moy Estuary SAC (000458) Yes Yes River Moy SAC (002298) Yes Yes Killala Bay/Moy Estuary SPA (004036) Yes Yes Lough Conn and Lough Cullin SPA (004228) Yes Yes

The screened in channel and embankment sections (and the bridges within these sections) in the Moy Arterial Drainage Scheme are shown on the map below, and tabulated in Appendix A.

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Figure 4-3: Channels and embankments with potential impacts via land and air pathways

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5 Groundwater Pathways

5.1 Introduction The following section of this report examines the groundwater pathways which may arise due to drainage maintenance activities in the Moy Arterial Drainage Scheme. The impact of these pathways, if any, on Natura 2000 sites, is then assessed.

5.2 Results for the Moy Scheme

5.2.1 Level 1: Characterisation and Initial Impact Assessment It is assumed that none of the proposed drainage maintenance activities in the Moy Arterial Drainage Scheme are directly necessary to the nature conservation management of Natura 2000 sites. Step 1 Each of the drainage maintenance activities detailed in Table 2-1 is proposed in the Moy Arterial Drainage Scheme. Step 2 The Moy Arterial Drainage Scheme is located across 14 groundwater bodies (GWB). Two GWBs were removed as they did not contain any Natura 2000 sites. Some data quality assessment was required during the GIS analysis of the GWBs overlapping the Moy scheme as it was apparent that in a few locations some small sections of channel overlapped a GWB boundary incorrectly from a hydrogeological perspective. This is possibly due to the digitised boundary of the GWBs not reflecting topographic catchment boundaries or due to digitisation being undertaken at different scales of mapping. Consequently it was possibly to remove a further three GWBs on the basis of this qualitative review of GWB boundaries; Cong-Robe (IE_WE_G_0019), Clare-Corrib (IE_WE_G_0020) and Ballyhean (IE_WE_G_0022). There are 11 Natura 2000 sites (9 SACs and 2 SPAs) located within the 9 remaining GWBs and remain within the screening assessment, as detailed in Table 5-1. Table 5-1: Groundwater Pathway - Step 2 GWB name (EU_Code) and Natura 2000 Site Natura 2000 Site (Site Code) flow regime within GWB Lough Corrib SAC (000297) Ardkill Turlough SAC (000461) Ballymaglancy Cave, Cong SAC (000474) Carrowkeel Turlough SAC (000475) Cloughmoyne SAC (000479) Clyard Kettle-Holes SAC (000480) Screened out through visual Cong-Robe (IE_WE_G_0019) Greaghans Turlough SAC (000503) inspection of Karstic Kilglassan/Caheravoostia Turlough groundwater body Complex SAC (000504) boundary Morcorha Lough SAC (001536) Lough Carra/Mask Complex SAC (001774) Kildun Souterrain SAC (002320) Lough Corrib SPA (004042) Lough Mask SPA (004062) Levally Lough SAC (000295) Lisnageeragh Bog and Ballinastack Turlough SAC (000296) Lough Corrib SAC (000297) Screened out through visual Clare-Corrib (IE_WE_G_0020) Lough Lurgeen Bog/Glenamaddy Turlough inspection of Karstic SAC (000301) groundwater body Cloughmoyne SAC (000479) boundary Shrule Turlough SAC (000525) Monivea Bog SAC (002352) Lough Corrib SPA (004042) Ballyhean (IE_WE_G_0022) Moore Hall (Lough Carra) SAC (000527) Screened out 2015s2905 AA Screening Moy v1.0 23

GWB name (EU_Code) and Natura 2000 Site Natura 2000 Site (Site Code) flow regime within GWB Karstic Lough Carra/Mask Complex SAC (001774) through visual Towerhill House SAC (002179) inspection of Lough Corrib SPA (004042) groundwater body Lough Mask SPA (004062) boundary Beltra Lough North River Moy SAC (002298) Yes (IE_WE_G_0025) Lough Conn and Lough Cullin SPA Yes Karstic (004228) Tobercurry (IE_WE_G_0029) None No Karstic Owenduff/Nephin Complex SAC (000534) Yes Bellacorick Bog Complex SAC (001922) Yes Laherdaun (IE_WE_G_0030) River Moy SAC (002298) Yes Poorly Productive Bedrock Lough Conn and Lough Cullin SPA Yes (004228) Kilkelly Charlestown Bella Turlough SAC (000463) Yes (IE_WE_G_0032) River Moy SAC (002298) Yes Poorly Productive Bedrock Balla Turlough SAC (000463) Yes (IE_WE_G_0033) Ballinafad SAC (002081) Yes Karstic River Moy SAC (002298) Yes Killala Bay/Moy Estuary SAC (00458) Yes Lough Hoe Bog SAC (000633) Yes Lough Nabrickkeagh Bog SAC (000634) Yes (IE_WE_G_0034) Ox Mountains Bogs SAC (002006) Yes Poorly Productive Bedrock River Moy SAC (002298) Yes Killala Bay/Moy Estuary SPA (004036) Yes Lough Conn and Lough Cullin SPA Yes (004228) Killala Bay/Moy Estuary SAC (00458) Yes Bellacorick Bog Complex SAC (001922) Yes Ballina (IE_WE_G_0035) River Moy SAC (002298) Yes Karstic Killala Bay/Moy Estuary SPA (004036) Yes Lough Conn and Lough Cullin SPA Yes (004228) Killala Bay/Moy Estuary SAC (00458) Yes Bellacorick-Killala Bellacorick Bog Complex SAC (001922) Yes (IE_WE_G_0041) River Moy SAC (002298) Yes Poorly Productive Bedrock Killala Bay/Moy Estuary SPA (004036) Yes Moy Sands and Gravels (IE_WE_G_0064) River Moy SAC (002298) Yes Gravel Castlebar (IE_WE_G_0073) None No Karstic Landfill 2 (IE_WE_G_0083) Killala Bay/Moy Estuary SAC (00458) Yes Karstic Killala Bay/Moy Estuary SPA (004036) Yes

Step 3 The Qualifying Interests/Special Conservation Interests for each Natura 2000 site within the identified GWBs were obtained from the relevant Conservation Objective document available from the NPWS (2014). Table 5-2 below details which of the 11 Natura 2000 sites identified in Table 5-1 above have Qualifying Interests/Special Conservation Interests which can be potentially impacted upon by groundwater pathways. 10 Natura 2000 sites were identified as groundwater dependent (GWD) Qualifying Interests/Special Conservation Interests and therefore remain in this screening assessment, as detailed in Table 5-2.

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Table 5-2: Groundwater Pathway - Step 3 GWD Qualifying GWB name (EU_Code) and Natura 2000 Site (Site Code) Interests/Special flow regime Conservation Interests

Beltra Lough North River Moy SAC (002298) Yes (IE_WE_G_0025) Lough Conn and Lough Cullin SPA Yes Karstic (004228) Owenduff/Nephin Complex SAC Yes (000534) Bellacorick Bog Complex SAC Laherdaun (IE_WE_G_0030) Yes (001922) Poorly Productive Bedrock River Moy SAC (002298) Yes Lough Conn and Lough Cullin SPA Yes (004228) Kilkelly Charlestown Balla Turlough SAC (000463) Yes (IE_WE_G_0032) River Moy SAC (002298) Yes Poorly Productive Bedrock Bella Turlough SAC (000463) Yes Swinford (IE_WE_G_0033) Ballinafad SAC (002081) No Karstic River Moy SAC (002298) Yes Killala Bay/Moy Estuary SAC (00458) Yes Lough Hoe Bog SAC (000633) Yes Lough Nabrickkeagh Bog SAC Yes (000634) Foxford (IE_WE_G_0034) Ox Mountains Bogs SAC (002006) Yes Poorly Productive Bedrock River Moy SAC (002298) Yes Killala Bay/Moy Estuary SPA (004036) Yes Lough Conn and Lough Cullin SPA Yes (004228) Killala Bay/Moy Estuary SAC (00458) Yes Bellacorick Bog Complex SAC Yes (001922) Ballina (IE_WE_G_0035) River Moy SAC (002298) Yes Karstic Killala Bay/Moy Estuary SPA (004036) Yes Lough Conn and Lough Cullin SPA Yes (004228) Killala Bay/Moy Estuary SAC (00458) Yes Bellacorick Bog Complex SAC Bellacorick-Killala Yes (IE_WE_G_0041) (001922) Poorly Productive Bedrock River Moy SAC (002298) Yes Killala Bay/Moy Estuary SPA (004036) Yes Moy Sands and Gravels (IE_WE_G_0064) River Moy SAC (002298) Yes Gravel Landfill 2 (IE_WE_G_0083) Killala Bay/Moy Estuary SAC (00458) Yes Karstic Killala Bay/Moy Estuary SPA (004036) Yes

It should be noted that whilst Ballinafad SAC is designated for Lesser Horseshoe Bat Rhinolophus hipposideros, which is identified in the methodology (Ryan Hanley, 2013a) as a GWD interest feature, at this site the bat population is associated with a building roof which is an archaeological feature and therefore not a GWD habitat. This site has therefore been screened out of the groundwater pathway assessment at this stage.

5.2.2 Level 2: Existing Impact Assessment Step 4 The 'At Risk' status (from the Environmental Protection Agency (EPA) WFD list) of all GWBs with Natura 2000 sites containing GWD Qualifying Interests/Special Conservation Interests was then determined; 21 were identified as being 'At Risk', as detailed in Table 5-3.

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Table 5-3: Groundwater Pathway - Step 4 GWB name (EU_Code) and EPA Water Framework Natura 2000 Site (Site Code) flow regime Directive 'At Risk'

Beltra Lough North River Moy SAC (002298) (IE_WE_G_0025) Lough Conn and Lough Cullin SPA No Karstic (004228) Owenduff/Nephin Complex SAC (000534) Bellacorick Bog Complex SAC Laherdaun (IE_WE_G_0030) No (001922) Poorly Productive Bedrock River Moy SAC (002298) Lough Conn and Lough Cullin SPA (004228) Kilkelly Charlestown Bella Turlough SAC (000463) (IE_WE_G_0032) No River Moy SAC (002298) Poorly Productive Bedrock Balla Turlough SAC (000463) Swinford (IE_WE_G_0033) Ballinafad SAC (002081) Yes Karstic River Moy SAC (002298) Killala Bay/Moy Estuary SAC (00458) Lough Hoe Bog SAC (000633) Lough Nabrickkeagh Bog SAC (000634) Foxford (IE_WE_G_0034) Ox Mountains Bogs SAC (002006) No Poorly Productive Bedrock River Moy SAC (002298) Killala Bay/Moy Estuary SPA (004036) Lough Conn and Lough Cullin SPA (004228) Killala Bay/Moy Estuary SAC (00458) Bellacorick Bog Complex SAC (001922) Ballina (IE_WE_G_0035) River Moy SAC (002298) Yes Karstic Killala Bay/Moy Estuary SPA (004036) Lough Conn and Lough Cullin SPA (004228) Killala Bay/Moy Estuary SAC (00458) Bellacorick-Killala Bellacorick Bog Complex SAC (IE_WE_G_0041) (001922) No Poorly Productive Bedrock River Moy SAC (002298) Killala Bay/Moy Estuary SPA (004036) Moy Sands and Gravels (IE_WE_G_0064) River Moy SAC (002298) Yes Gravel Landfill 2 (IE_WE_G_0083) Killala Bay/Moy Estuary SAC (00458) Yes Karstic Killala Bay/Moy Estuary SPA (004036)

5.2.3 Level 3: Potential Impact and Significance Assessment Step 5 This stage assesses whether there is potential for a drainage maintenance activity to effect the Qualifying Interests/Special Conservation Interests of the Natura 2000 site(s) within the zone of influence of a scheme. This is determined through undertaking a visual assessment of the topographic catchment of the Natura 2000 site, combined with application of a buffer to the Natura 2000 site boundaries at a pre-established distance dependent on the flow regime of the GWB (i.e. karstic, fissured, poorly productive, intergranular) (Ryan Hanley, 2014a). Depending on this, a conclusion can then be made as to whether potential effects may occur. The results of this are summarised in Table 5-4.

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Table 5-4: Groundwater Pathway - Step 5 Drainage maintenance GWB name Natura 2000 Site Name activity location relative (EU_Code) and Result (Site code) to Natura 2000 site flow regime boundary Potential River Moy SAC (002298) Within N2000 site Beltra Lough North effect (IE_WE_G_0025) Lough Conn and Lough Potential Karstic Within N2000 site Cullin SPA (004228) effect Within topographic Owenduff/Nephin Complex No Potential catchment of N2000 site SAC (000534) effect and >1km from N2000 site Within topographic Bellacorick Bog Complex No Potential Laherdaun catchment of N2000 site SAC (001922) effect (IE_WE_G_0030) and >1km from N2000 site Poorly Productive Within topographic No Potential Bedrock River Moy SAC (002298) catchment of N2000 site effect and >1km from N2000 site Within topographic Lough Conn and Lough No Potential catchment of N2000 site Cullin SPA (004228) effect and >1km from N2000 site Within topographic Kilkelly Charlestown Bella Turlough SAC Potential catchment of N2000 site (IE_WE_G_0032) (000463) effect and <1km from N2000 site Poorly Productive Potential Bedrock River Moy SAC (002298) Within N2000 site effect Balla Turlough SAC Within topographic Potential Swinford (000463) catchment of N2000 site effect (IE_WE_G_0033) Potential Karstic River Moy SAC (002298) Within N2000 site effect Killala Bay/Moy Estuary Potential Within N2000 site SAC (00458) effect Within topographic Lough Hoe Bog SAC No Potential catchment of N2000 site (000633) effect and >1km from N2000 site Within topographic Lough Nabrickkeagh Bog No Potential catchment of N2000 site SAC (000634) effect Foxford and >1km from N2000 site (IE_WE_G_0034) Within topographic Poorly Productive Ox Mountains Bogs SAC Potential catchment of N2000 site Bedrock (002006) effect and <1km from N2000 site Potential River Moy SAC (002298) Within N2000 site effect Killala Bay/Moy Estuary Potential Within N2000 site SPA (004036) effect Lough Conn and Lough Potential Within N2000 site Cullin SPA (004228) effect Killala Bay/Moy Estuary Potential Within N2000 site SAC (00458) effect Within GWB containing N2000 site (site is significantly upgradient of Bellacorick Bog Complex No Potential drainage works and only a SAC (001922) effect Ballina negligible corner within the (IE_WE_G_0035) Ballina GWB and so Karstic screened out) Potential River Moy SAC (002298) Within N2000 site effect Killala Bay/Moy Estuary Potential Within N2000 site SPA (004036) effect Lough Conn and Lough Potential Within N2000 site Cullin SPA (004228) effect Bellacorick-Killala Killala Bay/Moy Estuary Potential Within N2000 site (IE_WE_G_0041) SAC (00458) effect

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Drainage maintenance GWB name Natura 2000 Site Name activity location relative (EU_Code) and Result (Site code) to Natura 2000 site flow regime boundary Poorly Productive Bellacorick Bog Complex Within GWB containing No Potential Bedrock SAC (001922) N2000 site effect Potential River Moy SAC (002298) Within N2000 site effect Killala Bay/Moy Estuary Potential Within N2000 site SPA (004036) effect Moy Sands and Gravels Potential River Moy SAC (002298) Within N2000 site (IE_WE_G_0064) effect Gravel Killala Bay/Moy Estuary Potential Landfill 2 Within N2000 site SAC (00458) effect (IE_WE_G_0083) Killala Bay/Moy Estuary Potential Karstic Within N2000 site SPA (004036) effect

Step 6 Relevant information relating to each Natura 2000 site still remaining in the screening assessment at this stage, including the Conservation Objectives Supporting Document, Site Synopsis and Natura 2000 Standard Data Form, were then reviewed to identify the potential for pressures and threats and related cumulative and in-combination effects. The results of this assessment are detailed in Table 5-5. Table 5-5: Groundwater Pathway - Step 6 Potential for Presence of Pressure/ or Cumulative Pressures or Natura 2000 Site groundwater Threat Codes Impact and In- Threats pathways from Article 17 combination Effects Invasive non-native NO I01 species Outdoor sports and leisure activities, recreational activities - Walking, horseriding No G01.02 and non-motorised vehicles (inside & outside N2000 site) Modification of No A02 Potential Killala Bay/Moy cultivation practices Effect * Estuary SAC Leisure fishing (000458) (positive & negative No F02.03 Proceed to impact) Step 7 Urbanised areas, No E01 human habitation Sports and leisure structures - Camping No G02.08 and caravans Sports and leisure structures – Golf No G02.01 course Agriculture - grazing No A04 Agriculture – grazing (inside and outside Potential No A04 Ox Mountains N2000 site, positive & Effect * Bogs SAC negative impact) (002006) Sylviculture, forestry – Proceed to forest planting on No B01 Step 7 open ground

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Potential for Presence of Pressure/ or Cumulative Pressures or Natura 2000 Site groundwater Threat Codes Impact and In- Threats pathways from Article 17 combination Effects Peat extraction – mechanical removal No C01.03.02 of peat (inside and outside N2000 site) Improved access to No D05 site Abiiotic natural No K01.01 processes – erosion Roads, paths and railroads – roads, No D01.02 motorways (positive & negative impacts) Peat extraction – hand cutting of peat No C01.03.01 (inside and outside N2000 site) Agriculture – mowing, cutting of grassland No A03 (inside and outside N2000 site) Hunting (positive and No F03.01 negative impact) Agriculture – grazing (inside and outside No A04 N2000 site, positive & negative impact) Agriculture – fertilisation (inside and No A08 outside N2000 site) Sylviculture, forestry (inside and outside No B N2000 site) Potential Fire and fire Effect * River Moy SAC No J01 suppression (002298) Invasive non-native Proceed to No I01 species Step 7 Urbanised areas, human habitation – dispersed habitation No E01.03 (outside N2000 site, positive & negative impacts) Leisure fishing (positive & negative No F02.03 impacts) Peat extraction No C01.03 Urbanised areas, human habitation (inside and outside No E01 N2000 site, positive & negative impacts) Agriculture – No A08 fertilisation Leisure fishing Potential Killala Bay/Moy (positive & negative No F02.03 Effect * Estuary SPA impacts) (004036) Outdoor sports and Proceed to leisure activities, Step 7 No G01.02 recreational activities - Walking, horseriding

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Potential for Presence of Pressure/ or Cumulative Pressures or Natura 2000 Site groundwater Threat Codes Impact and In- Threats pathways from Article 17 combination Effects and non-motorised vehicles Urbanised areas, No E01 human habitation Agriculture – No A08 fertilisation Potential Sylviculture, forestry No B Lough Conn and Effect * Leisure fishing Lough Cullin SPA (positive & negative No F02.03 (004228) Proceed to impacts) Step 7 Invasive non-native No I01 species Agriculture – No A08 fertilisation Potential Hunting (positive and Effect * Balla Turlough No F03.01 negative impact) SAC (000463) Agriculture – grazing Proceed to (positive & negative No A04 Step 7 impact) Note: * proceeding under the precautionary principle as no pressure or threats with a complete source-pathway- receptor chain via groundwater pathways were identified,

Step 7 and 8 This stage involves examining each of the GWBs in turn and determining, based on the GWD Qualifying Interests/Special Conservation Interests of each Natura 2000 site, whether they are likely to be significantly affected by the drainage maintenance activates. This is based on an assessment of whether the activity is up or down gradient of a Natura 2000 site. Step 8 has also been reported concurrently alongside Step 7 due to the large number of sites remaining in the assessment for this Scheme. As part of Step 8, further information on the remaining GWBs and Natura 2000 sites was collected to determine the likely effects of drainage maintenance activities relative to the GWD Qualifying Interests/Special Conservation Interests of each site, based on their typology. Table 5-6: Groundwater Pathway - Step 7 – for SACs GWD Drainage maintenance Desk Study Comment GWB Qualifying Habitat activity location relative Result Interest Habitats Typology to Natura 2000 site Killala Bay/Moy Estuary SAC (000458) 1330 Atlantic salt Location of habitat overlaps with Potential for meadows A Upgradient arterial drainage channels (see significant Glauco‐Puccinellietalia Figure 3-5) effect maritimae Location of habitat significantly downgradient of arterial drainage No potential 2190 Humid dune channels. Habitat is likely to be for A Upgradient slacks tidally dominated and drainage significant maintenance will have no impact effect on tidal flows or regime. Ox Mountains Bogs SAC (002006) 3110 Oligotrophic No potential waters containing very N2000 site upgradient of arterial for few minerals of sandy A Downgradient drainage channels. significant plains (Littorelletalia effect uniflorae) 3160 Natural dystrophic N2000 site upgradient of arterial No potential A Downgradient lakes and ponds drainage channels. for 2015s2905 AA Screening Moy v1.0 30

GWD Drainage maintenance Desk Study Comment GWB Qualifying Habitat activity location relative Result Interest Habitats Typology to Natura 2000 site significant effect No potential 4010 Northern Atlantic N2000 site upgradient of arterial for wet heaths with Erica A Downgradient drainage channels. significant tetralix effect 7130 Blanket bogs (* if No potential active bog) N2000 site upgradient of arterial for A Downgradient drainage channels. significant effect 7150 Depressions on No potential peat substrates of the N2000 site upgradient of arterial for A Downgradient Rhynchosporion drainage channels. significant effect River Moy SAC (002298) Assumed throughout the floodplains and isolated Potential for 7110 Active raised B1 Downgradient & Upgradient depressions in the Moy significant bogs* Catchment. Some connected to effect the River Moy during floods. Assumed throughout the 7120 Degraded raised floodplains and isolated Potential for bogs still capable of B1 Downgradient & Upgradient depressions in the Moy significant natural regeneration Catchment. Some connected to effect the River Moy during floods. Assumed throughout the 7150 Depressions on floodplains and isolated Potential for peat substrates of the A Downgradient & Upgradient depressions in the Moy significant Rhynchosporion Catchment. Some connected to effect the River Moy during floods. Assumed throughout the floodplains and isolated Potential for 7230 Alkaline fens A# Downgradient & Upgradient depressions in the Moy significant Catchment. Some connected to effect the River Moy during floods. 91E0 Alluvial forests Assumed throughout the with Alnus glutinosa floodplains and isolated Potential for and Fraxinus excelsior A Downgradient & Upgradient depressions in the Moy significant (Alno-Padion, Alnion Catchment. Some connected to effect incanae, Salicion the River Moy during floods. albae)* Balla Turlough SAC (000463) Arterial drainage channels Potential for 3180 Turloughs * B1 Downgradient located downgradient of significant turloughs. effect Note: GWD Habitat Typology after Table 5.1 Kilroy et al (2008) in Ryan Hanley (2014a) A = Type A, Groundwater Discharge Zone Wetlands B = Type B, Groundwater Flow-through Depression Wetlands A or B = No available information, based on expert opinion B1 = Where identified by Kilroy et al (2008) as both A and B type. B has been selected as worst case scenario A# = Type A, Groundwater Discharge Zone Wetlands additionally identified in consultation with NPWS as potentially being impacted by downgradient activities

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Table 5-7: Groundwater Pathway - Step 7 - for SPAs Habitats as per Drainage Natura 2000 Potential GWD GWD maintenance Standard Data Habitats supporting Desk Study Habitat activity location Result Form, Site SCIs Fossitt 2000 Comment Typology relative to Synopsis or (Annex I) Natura 2000 site COSD Lough Conn and Lough Cullin SPA (004228) N14: Improved No Potential Grassland No N/A N/A N/A for significant effect N08: Heath, Northern Atlantic wet Potential for Scrub, Maquis heaths with Erica Upgradient and A significant and Garrigue, tetralix downgradient effect Phygrana (4010) N10: Humid No Potential grassland, No N/A N/A for significant Mesophile effect grassland Oligotrophic waters containing very few Potential for minerals of sandy Upgradient and A significant plains (Littorelletea downgradient effect uniflorae) Lough Conn and (3110) Lough Cullin are both classified as Oligotrophic to Oligotrophic/Mesotr mesotrophic standing phic (EPA, 2016). waters with vegetation Potential for Upgradient and Therefore, as a of the Littorelletea A significant downgradient precautionary uniflorae and/or of the effect measure a number N06: Inland Isoёto-Nannojuncetea of encompassing water bodies (3130) GWD Annex I (Standing water, Hard oligotrophic- habitats are Running water) mesotrophic waters included. Potential for with benthis Upgradient and A significant vegetation of Chara downgradient effect sp. (3140) Watercourses of plain A number of to montane water watercourses flow levels with the into and out of Potential for Upgradient and Ranunculion fluitantis A Lough Conn and significant downgradient and Callitricho- Lough Cullin, effect Batrachion vegetation namely the River (3260) Deel and River Moy. Killala Bay/Moy Estuary SPA (004036) No Potential N05: Shingle, No N/A N/A N/A for significant Sea cliffs, Islets effect Atlantic salt meadows (Glauco- Potential for Upgradient and Puccinellietalia A significant N03: Salt downgradient maritimae) effect marshes, Salt (1330) pastures, Salt Mediterranean salt steppes Potential for meadows (Juncetalia Upgradient and A significant maritimi) downgradient effect (1410)

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Habitats as per Drainage Natura 2000 Potential GWD GWD maintenance Standard Data Habitats supporting Desk Study Habitat activity location Result Form, Site SCIs Fossitt 2000 Comment Typology relative to Synopsis or (Annex I) Natura 2000 site COSD Machair is not located within the SPA boundary (NPWS, 2013). Five dune habitats were recorded by Ryle et al. (2009) within the SPA area but only one of these is GWD (Ryan Hanley, 2014a). However, Humid Dune Slacks are within Killala South - IE_WE_G_0047 GW body, which has N04: Coastal been screened out No Potential sand dunes, Humid dune slacks of this assessment A Upgradient for significant Sand beaches, (2190) earlier in the effect Machair process. See Figure 5-1 for the location of Humid Dune Slacks (2190). Those located on the headland are within the Killala South groundwaterbody, those located on the Island are not within any groundwaterbody and it is assumed the groundwater is dominated by saline water here. The coastal lagoon is located east of Ballynaparka, N02: Tidal rivers, Killala, within Killala Estuaries, Mud South - No Potential flats, Sand flats, Coastal Lagoons A Upgradient IE_WE_G_0047 for significant Lagoons (1150) GWB. This GWB effect (including was screened out of saltwork basins) this assessment earlier in the process. Note: GWD Habitat Typology after Table 5.1 Kilroy et al (2008) in Ryan Hanley (2014a) A = Type A, Groundwater Discharge Zone Wetlands B = Type B, Groundwater Flow-through Depression Wetlands A or B = No available information, based on expert opinion B1 = Where identified by Kilroy et al (2008) as both A and B type. B has been selected as worst case scenario A# = Type A, Groundwater Discharge Zone Wetlands additionally identified in consultation with NPWS as potentially being impacted by downgradient activities

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Figure 5-1: Location of sand dune habitats in Killala Bay / Moy Estuary SAC (000458), from NPWS site synopsis

Step 9 A review of the attributes and targets for the Qualifying Interests/Special Conservation Interests has identified that there is potential for significant effects on GWD Qualifying Interests/Special Conservation Interests in the following Natura 2000 sites. Table 5-8: Groundwater Pathway - Step 9 Potential for Effects Potential for Likely Natura 2000 Site Based on Attributes Significant Effects

Killala Bay/Moy Estuary SAC (000458) Yes Yes River Moy SAC (002298) Yes Yes Balla Turlough SAC (000463) Yes Yes Lough Conn and Lough Cullin SPA (004228) Yes Yes Killala Bay/Moy Estuary SPA (004036) Yes Yes 2015s2905 AA Screening Moy v1.0 34

Step 10 The following Natura 2000 sites will require a Stage 2 Appropriate Assessment to be undertaken and the preparation of a Natura Impact Statement or further site specific investigations, if more data becomes available. Potential for Likely Potential for Natura 2000 Site Significant Effects Cumulative Impacts must be considered must be considered

Killala Bay/Moy Estuary SAC (000458) Yes Yes River Moy SAC (002298) Yes Yes Balla Turlough SAC (000463) Yes Yes Lough Conn and Lough Cullin SPA (004228) Yes Yes Killala Bay/Moy Estuary SPA (004036) Yes Yes

The screened in channel and embankment sections (and the bridges within these sections) in the Moy Arterial Drainage Scheme are shown on the map below, and tabulated in Appendix A. Figure 5-2: Channels and embankments with potential impacts via groundwater pathways

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6 Conclusions From this screening exercise it has been determined that significant likely effects may arise on the following Natura 2000 sites as a result of OPW drainage maintenance activities. Table 6-1: Conclusions Pathway of Impact Comment Site Surface Land Ground Water and Air water

The turlough habitat for which this SAC is designated could be adversely impacted upon Balla Turlough SAC (000463) by groundwater pathways. No impacts via other pathways are anticipated. The Lesser Horseshoe Bat population of this SAC could potentially be impacted upon in Ballinafad SAC (002081) relation to foraging habitat outside the SAC boundary. Potential adverse impacts via all three pathways were identified as a result of the screening exercise. However, not all interest Killala Bay/Moy Estuary SAC features will be impacted upon by each (000458) pathway, depending on whether they are surface water or groundwater dependent features and their location. All interest features of this site, including both the habitats (i.e. bogs, woodlands) and species River Moy SAC (002298) (i.e. White-clawed crayfish, Otter, Salmon, lampreys) will potentially be adversely impacted upon via all three pathways. Potential adverse impacts on the wetland bird Killala Bay/Moy Estuary SPA populations of this site via all three pathways

(004036) were identified as a result of the screening exercise. Potential adverse impacts on the wetland bird Lough Conn and Lough Cullin populations of this site via all three pathways

SPA (004228) were identified as a result of the screening exercise. Potential adverse impacts on surface water dependent habitats and species have been identified ansd are assumed to be located Lough Hoe Bog SAC (000633) throughout the SAC and so could be within 3km upstream of arterial drainage maintenance works. Potential adverse impacts on surface water dependent habitats and species have been Ox Mountains Bogs SAC identified ansd are assumed to be located

(002006) throughout the SAC and so could be within 3km upstream of arterial drainage maintenance works. Note: Red = likely significant effect Green = no likely significant effect

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Appendices A Maps of Screened In Channels

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B Screening Results

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References Department of Environment, Heritage and Local Government (2009) Appropriate Assessment of Plans and Projects in Ireland - Guidance for Planning Authorities Fossitt, J.A. (2000) A Guide to Habitats in Ireland. The Heritage Council, Dublin. JNCC (2014) Annex I Habitat Accounts. http://jncc.defra.gov.uk/ProtectedSites/SACselection/SAC_habitats.asp [date accessed 19th October 2015] Kilroy, G., Dunne, F., Ryan, J., O'Connor, A., Daly, D., Craig, M., Coxon, C., Johnston, P. and Moe, H. (2008) A Framework for the Assessment of Groundwater – Dependent Terrestrial Ecosystems under the Water Framework Directive. Environmental Protection Agency. NPWS (2015) Conservation objectives for River Moy SAC [002298]. Generic Version 4.0. Department of Arts, Heritage and the Gaeltacht. NPWS (2015a) Conservation objectives for Ballinafad SAC [002081]. Generic Version 4.0. Department of Arts, Heritage and the Gaeltacht. NPWS (2015b) Conservation objectives for Lough Conn and Lough Cullin SPA [004228]. Generic Version 4.0. Department of Arts, Heritage and the Gaeltacht. NPWS (2015c) Conservation objectives for Balla Turlough SAC [000463]. Generic Version 4.0. Department of Arts, Heritage and the Gaeltacht. NPWS (2014) Article 17 Habitat Assessments: Individual Habitat Reports. http://www.npws.ie/article-17-reports-0 [date accessed 19th October 2015] NPWS (2014a) River Moy SAC Site Synopsis. http://www.npws.ie/sites/default/files/protected- sites/synopsis/SY002298.pdf [date accessed 30th September 2015] NPWS (2014b) River Moy SAC Natura 2000 Data Form. http://www.npws.ie/sites/default/files/protected-sites/natura2000/NF002298.pdf [date accessed 30th September 2015] NPWS (2014c) Ballinafad SAC Natura 2000 Data Form. http://www.npws.ie/sites/default/files/protected-sites/natura2000/NF002081.pdf [date accessed 22nd October 2015] NPWS (2014d) Killala Bay/Moy Estuary SAC Natura 2000 Data Form. http://www.npws.ie/sites/default/files/protected-sites/natura2000/NF000458.pdf [date accessed 22nd October 2015] NPWS (2014e) Killala Bay/Moy Estuary SPA Natura 2000 Data Form. http://www.npws.ie/sites/default/files/protected-sites/natura2000/NF004036.pdf [date accessed 23rd October 2015] NPWS (2014f) Lough Conn and Lough Cullin SPA Natura 2000 Data Form. http://www.npws.ie/sites/default/files/protected-sites/natura2000/NF004228.pdf [date accessed 28th October 2015] NPWS (2015g) Balla Turlough SAC Natura 2000 Data Form. http://www.npws.ie/sites/default/files/protected-sites/natura2000/NF000463.pdf [date accessed 2nd November 2015] NPWS (2013a) Conservation Objectives: Galway Bay Complex SAC 000268. Version 1. National Parks and Wildlife Service, Department of Arts, Heritage and the Gaeltacht. http://www.npws.ie/sites/default/files/protected-sites/conservation_objectives/CO000268.pdf [date accessed 10th September 2015] NPWS (2013b) Ballinafad SAC Site Synopsis. http://www.npws.ie/sites/default/files/protected- sites/synopsis/SY002081.pdf [date accessed 22nd October 2015] NPWS (2013c) Conservation Objectives: Kenmare River SAC 002158. Version 1. National Parks and Wildlife Service, Department of Arts, Heritage and the Gaeltacht.

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http://www.npws.ie/sites/default/files/protected-sites/conservation_objectives/CO002158.pdf [date accessed 10th September 2015] NPWS (2013d) Killala Bay/Moy Estuary SAC Site Synopsis. http://www.npws.ie/sites/default/files/protected-sites/synopsis/SY000458.pdf [date accessed 22nd October 2015] NPWS (2013e) Conservation Objectives: Killala Bay/Moy Estuary SPA 004036. Version 1. National Parks and Wildlife Service, Department of Arts, Heritage and the Gaeltacht. http://www.npws.ie/sites/default/files/protected-sites/conservation_objectives/CO004036.pdf [date accessed 23rd October 2015] NPWS (2013f) Killala Bay/Moy Estuary SPA: Conservation Objectives Supporting Document. http://www.npws.ie/sites/default/files/publications/pdf/004036_Killala%20Bay%20Moy%20Estuar y%20SPA%20Supporting%20Doc_V1.pdf [date accessed 23rd October 2015] NPWS (2013g) Balla Turlough SAC Site Synopsis. http://www.npws.ie/sites/default/files/protected-sites/synopsis/SY000463.pdf [date accessed 2nd November 2015] NPWS (2012a) Conservation Objectives: Killala Bay/Moy Estuary SAC 000458. Version 1.0. National Parks and Wildlife Service, Department of Arts, Heritage and the Gaeltacht. http://www.npws.ie/sites/default/files/protected-sites/conservation_objectives/CO000458.pdf [date accessed 10th September 2015] NPWS (2012b) Conservation Objectives: Lower SAC 002165. Version 1.0. National Parks and Wildlife Service, Department of Arts, Heritage and the Gaeltacht. http://www.npws.ie/sites/default/files/protected-sites/conservation_objectives/CO002165.pdf [date accessed 10th September 2015] NPWS (2011) and SAC Conservation Objectives. http://www.npws.ie/sites/default/files/protected-sites/conservation_objectives/CO002162.pdf [date accessed 10th September 2015] NPWS (2010) Lough Conn and Lough Cullin SPA Site Synopsis. http://www.npws.ie/sites/default/files/protected-sites/synopsis/SY004228.pdf [date accessed 28th October 2015] NPWS (2005) Killala Bay/Moy Estuary SPA Site Synopsis. http://www.npws.ie/sites/default/files/protected-sites/synopsis/SY004036.pdf [date accessed 23rd October 2015] NPWS (2012) Conservation Objectives: Killala Bay/Moy Estuary SAC 000458. http://www.npws.ie/sites/default/files/protected-sites/conservation_objectives/CO000458.pdf [date accessed 15th January 2016] NPWS (2015) Conservation objectives for Bellacorick Bog Complex SAC [001922]. http://www.npws.ie/sites/default/files/protected-sites/conservation_objectives/CO001922.pdf [date accessed 14th January 2016] NPWS (2013) Bellacorick Bog Complex SAC [001922] Site Synopsis. http://www.npws.ie/sites/default/files/protected-sites/synopsis/SY001922.pdf [date accessed 14th January 2016] NPWS (2015) Conservation objectives for Lough Nabrickkeagh Bog SAC [000634]. http://www.npws.ie/sites/default/files/protected-sites/conservation_objectives/CO000634.pdf [date accessed 14th January 2016] NPWS (2013) Lough Nabrickkeagh Bog SAC [000634] Site Synopsis. http://www.npws.ie/sites/default/files/protected-sites/synopsis/SY000634.pdf [date accessed 14th January 2016] NPWS (2015) Conservation objectives for Owenduff/Nephin Complex SAC [000534]. http://www.npws.ie/sites/default/files/protected-sites/conservation_objectives/CO000534.pdf [date accessed 14th January 2016] NPWS (2013) Owenduff/Nephin Complex SAC [000534] Site Synopsis. http://www.npws.ie/sites/default/files/protected-sites/synopsis/SY000534.pdf [date accessed 14th January 2016] 2015s2905 AA Screening Moy v1.0 IV

NPWS (2015) Conservation objectives for Ox Mountains Bogs SAC [002006]. http://www.npws.ie/sites/default/files/protected-sites/conservation_objectives/CO002006.pdf [date accessed 14th January 2016] NPWS (2013) Ox Mountains Bogs SAC [002006] Site Synopsis. http://www.npws.ie/sites/default/files/protected-sites/synopsis/SY002006.pdf [date accessed 14th January 2016] NPWS (2013) Killala Bay/Moy Estuary SPA (Site Code 004036) Conservation objectives supporting document, version 1. National Parks and Wildlife Service, Unpublished Report. Hunt, J., Heffernan, M.L., McLoughlin, D., Benson, C. & Huxley, C. (2013) The breeding status of Common Scoter, Melanitta nigra in Ireland, 2012. Irish Wildlife Manuals, No. 66. National Parks and Wildlife Service, Department of the Arts, Heritage and the Gaeltacht, Ireland. NPWS (2010) Site Synopsis, Lough Conn and Lough Cullin SPA http://www.npws.ie/sites/default/files/protected-sites/synopsis/SY004228.pdf [date accessed 26/01/2016] Ryle, T., Murray, A., Connolly, K. and Swann, M. (2009). Coastal Monitoring Project 2004-2006. Unpublished report to the National Parks and Wildlife Service, Dublin. OPW (2014) The Office of Public Works Arterial Drainage Maintenance Activities 2014: Killimor Arterial Drainage Scheme Natura Impact Statement (NIS). Unpublished Report. OPW (2011a) Arterial Drainage Maintenance and High Risk Channel Designation Programme 2011-2014 Habitats Directive Assessments. Environment Section Engineering Services Office of Public Works. Unpublished Report. OPW (2011b) Arterial Drainage Maintenance Service Environmental Management Protocols and Standard Operating Procedures. Unpublished Report. OPW (2007) Ecological Impact Assessment (EcIA) of the Effects of Statutory Arterial Drainage Maintenance Activities on Water Courses of Plain to Montane levels with Aquatic Vegetation (Floating River Vegetation). http://www.opw.ie/media/Issue%20No.%205%20EcIA%20floating%20river%20vegetation.pdf [date accessed 19th October 2015] Ryan Hanley (2014a) Office of Public Works Arterial Drainage Maintenance Environmental Services 2013. Stage 1: Appropriate Assessment Screening Methodology for the Maintenance of Arterial Drainage Schemes. Methodology. Unpublished Report. Ryan Hanley (2014b) Office of Public Works Arterial Drainage Maintenance Environmental Services 2013. Stage 1: Appropriate Assessment Screening Methodology for the Maintenance of Arterial Drainage Schemes. Moy Validation Report. Unpublished Report. Ryan Hanley (2014c) Office of Public Works Arterial Drainage Maintenance Service 2014-2018. Source > Pathway > Receptor Chains for Appropriate Assessment. Unpublished Report.

2015s2905 AA Screening Moy v1.0 V

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