Do Thag. / Your Ref. At- - Environmental Protection Agency · Kilmaine Waste Water Discharge Licence Application – Appropriate Assessment Screening 1. INTRODUCTION Mayo County Council,

It

Comhairle Contae Mhaigh Eo Aras an Chontae, Caislean an Bharraigh, Contae Mhaigh Eo. Teileaf6n: (094) 9024444 Facs: (094) 9023937

Do Thag. / Your Ref. 00361-01

10th November 2010.

Administration Environmental Licensing Programme Office of Climate, Licensing & Resource Use Environmental Protection Agency Headq ua rters P.O. Box 3000 Johnstown Castle Estate County Wexford

At- dTag. / Our Ref. WS 512

RE: WASTE WATER DISCHARGE LICENCE APPLICATION: 00361-01 - KILMAINE

Dear Ms Wylde

Further to your letter of 1st November 2010, I enclose the required revised screening document as requested in that correspondence.

This documentation includes: • 1 no. signed copy & 1 no. copy in hardcopy format of the documentation • 1 no. copies of all files in electronic searchable PDF format on CD-ROM

The content of the electronic files on the accompanying CD-ROM is a true copy of the original documentation.

Thank you,

Yours sincerely

Director of Services

. www.mayococo.le

Mayo County Council Aras an Chontae, Castlebar, Co. Mayo. Tel: (094) 9024444 Fax: (094) 9023937

It

Comhairle Contae Mhaigh Eo Aras an Chontae, Caislean an Bharraigh, Contae Mhaigh Eo. Teileaf6n: (094) 9024444 Facs: (094) 9023937

Do Thag. / Your Ref. 00361-01

10th November 2010.

Administration Environmental Licensing Programme Office of Climate, Licensing & Resource Use Environmental Protection Agency Headq ua rters P.O. Box 3000 Johnstown Castle Estate County Wexford

At- dTag. / Our Ref. WS 512

RE: WASTE WATER DISCHARGE LICENCE APPLICATION: 00361-01 - KILMAINE

Dear Ms Wylde

Further to your letter of 1st November 2010, I enclose the required revised screening document as requested in that correspondence.

This documentation includes: • 1 no. signed copy & 1 no. copy in hardcopy format of the documentation • 1 no. copies of all files in electronic searchable PDF format on CD-ROM

The content of the electronic files on the accompanying CD-ROM is a true copy of the original documentation.

Thank you,

Yours sincerely

Director of Services

. www.mayococo.le

Mayo County Council Aras an Chontae, Castlebar, Co. Mayo. Tel: (094) 9024444 Fax: (094) 9023937

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Kilmaine Waste Water Discharge Licence Application Regulation 18(3)(b) Reply

Contents

Regulation 16 Compliance Requirements .............................................. November 2010

Attachments: ................................................................. November 2010

Attachment F.1 Screening for Appropriate Assessment

Appendix A - Site Synopses for SAC’s

Appendix B – Waste Assimilative Capacity Calculations

Appendix C – Flow Chart from Appendix 1 of Circular L8/08

Regulation 16 Compliance Requirements ....................................................................CD

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MAYO COUNTY COUNCIL

KILMAINE

WASTE WATER DISCHARGE LICENCE

APPLICATION

Regulation 16 Compliance Requirements

Regulation 16 Compliance Responses – November 2010

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Kilmaine Waste Water Discharge Licence Application Regulation 18(3)(b) Reply

Regulation 16 Compliance Requirements Question No. 1 Further to my letter of 6th October 2010, assess the likelihood of significant effects of the waste water discharges from the Kilmaine agglomeration on the relevant European site (Lough Corrib SAC, Site code 000297) by referring to Circular L8/08 'Water services Investment and Rural Water Programmes - Protection of Natural Heritage and National Monuments' issued by the Department of Environment, Heritage and Local Government. In particular, the flow diagram in Appendix 1 should be completed and the results of each section recorded. If the discharges are deemed likely to have a significant effect, an appropriate assessment of the implications for the designated site in view of the sites conservation objectives must be carried out in accordance with the Agency's guidance ' Wastewater discharge licensing appropriate assessment guidance notes'. Answer No. 1 Attachment F.1, contains a revised version of the “D0361-01, Appropriate Assessment Screening for Kilmaine Wastewater Discharge Licence Application November 2010” document which includes consideration of Lough Corrib SAC, Site code 000297. The screening indicates that a full Appropriate Assessment will not be required.

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MAYO COUNTY COUNCIL

KILMAINE

WASTE WATER DISCHARGE LICENCE

APPLICATION

Regulation 16 Compliance Requirements

ATTACHMENT F.1

Screening for Appropriate Assessment – November 2010

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D0361-01

APPROPRIATE ASSESSMENT SCREENING

For

KILMAINE WASTEWATER DISCHARGE

LICENCE APPLICATION

November 2010

In accordance with the Waste Water Discharge (Authorisation) Regulations, 2007 (S.I. No. 684 of 2007)

And

Article 6(3) and 6 (4) of the

Habitats Directive 92/43/EEC

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Kilmaine Waste Water Discharge Licence Application – Appropriate Assessment Screening

1. INTRODUCTION

Mayo County Council, Aras an Chontae, Castlebar, County Mayo made an application to the Environmental Protection Agency (EPA) for a Waste Water Discharge Licence, for the Kilmaine Wastewater Treatment Plant & Agglomeration in compliance with the Waste Water Discharge (Authorisation) Regulations 2007 (S.I. No. 684 of 2007), in June 2009.

Under Part II Schedule 5 (5) of the Wastewater Discharge (Authorisation) Regulations 2007, In considering an application, where it appears to the Agency (i.e. Environmental Protection Agency) that the discharge concerned, or the proposed discharge, as the case may be, is likely to have a significant effect on a European site, either alone or in combination with other operations or activities, the Agency shall cause an assessment to be made of the implications for the site in view of that site’s conservation objectives, and the Agency in deciding on the application shall have regard to the conclusions of the assessment.

The Kilmaine Wastewater Treatment Plant discharges into the Cross River via a primary discharge point. The Cross River is a tributary of Lough Corrib.

This report includes:

1. Screening of the proposed plan in order to determine whether an Appropriate Assessment is required.

Purpose of Appropriate Assessment

Articles 6(3) and 6(4) of the Habitat Directive 92/43/EEC require an Appropriate Assessment of plans to prevent significant adverse effects on Natura 2000 sites.

Article 6(3) Any plan or project not directly connected with or necessary to the management of the site but likely to have a significant effect there on 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. In the light of the conclusions of the assessment of the implications for the site and subject to the provisions of paragraph 4, the competent national authorities shall agree to the plan or project only after having ascertained that it will not adversely affect the integrity of the site concerned and if appropriate, after having obtained the opinion of the general public.

Article 6(4) If, in spite of a negative assessment of the implications for the site and in the absence of alternative solutions, a plan or project must nevertheless be carried out for imperative reasons of overriding public interest, including those of social or economic nature, the Member State shall take all compensatory measures necessary to ensure that the overall coherence of the Nature 2000 site is protected. It shall inform the Commission of the compensatory measures adopted.

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The purpose of this assessment is to address the potential impacts of discharges from the Kilmaine Sewerage Scheme on 4 Natura 2000 Sites –

Clyard Kettle Holes SAC/pNHA, Mocorha Lough SAC/pNHA, Shrule Turlough SAC/pNHA: Lough Corrib SAC/SPA/pNHA

The Screening must determine whether the project is likely to have significant adverse effects on these sites either along or in conjunction with other plans and projects in the area and whether these effects will adversely affect the integrity of the SAC’s/pNHA’s/SPA in terms of their nature conservation objectives.

Figure 1.1 - Location Map – Kilmaine WWTP and associated discharges and adjacent Natura 2000 sites.

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2. APPROPRIATE ASSESSMENT - THE PROCESS

According to European Commission Methodological guidance on the provisions of Article 6(3) and (4) of the Habitats Directive 92/43/EC (2001) and MN2000, the assessment requirements of Article 6 establish a stage-by-stage approach as follows:

Stage 1 - Screening for a likely significant effect: An initial assessment of the project or plans effect on a European site(s). If it cannot be concluded that there will be no significant effect upon a European site, an AA is required;

Stage 2 - Appropriate Assessment: The consideration of the impact on the integrity of the Natura 2000 site of the project or plan, either alone or in combination with other projects of plans, with respect to the site’s structure and function and its conservation objectives. Additionally, where there are adverse impacts, an assessment of the potential mitigation of those impacts.

Stage 3 – Assessment of alternative solutions: The process which examines alternative ways of achieving the objectives of the project or plan that avoid adverse impacts on the integrity of the Natura 2000 site:

Stage 4 – Assessment where no alternative solutions exist and where adverse impacts remain: An assessment of compensatory measures where, in the light of an assessment of imperative reasons of overriding public interest (IROPI), it is deemed that the project or plan should proceed.

Each stage determines whether a further stage in the process is required. If, for example, the conclusions at the end of Stage One are that there will be no significant impacts on the Natura 2000 site, there is no requirement to proceed further.

The following Assessment has been prepared in consultation with the following documents:

Department of Environment, Heritage and Local Government (2008) Circular L8/08. Water Services Investment and Rural Water Programmes – Protection of Natural Heritage and National Monuments.

EPA (2008) Wastewater Discharge Licensing Appropriate Assessment: Note on Appropriate Assessments for the purposes of the Waste Water Discharge (Authorisation) Regulations, 2007 (S.I. No. 684 of 2007).

EC (2000) Managing Natura 2000 Sites: The provisions of Article 6 of the ‘Habitats’ Directive 92/43/EEC.

EC (2001) Assessment of plans and projects significantly affecting Natura 2000 sites: Methodological guidance on the provisions of Article 6(3) and (4) of the Habitats Directive 92/43/EEC.

Guidance document on Article 6(4) of the ‘Habitats Directive’ 92/43/EEC.

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3. STAGE 1 - SCREENING

Screening is the process of deciding whether or not an AA is required for the project or plan. Screening only requires sufficient information to determine if there is a likely significant effect on a Natura 2000 site and does not require the detailed information needed for the AA.

The following Stage 1 Screening was undertaken according to the Department of Environment, Heritage and Local Government Circular L8/08 and EC Methodological guidance on the provision of Article 6 (3) and (4) of the Habitats Directive 92/443/EEC. This Screening is used below to ascertain if an AA is required.

3.1 – Description of the Project

The Wastewater discharge application is for the licensing a single primary discharge from the existing sewerage scheme that serves Kilmaine agglomeration.

The Kilmaine Wastewater Treatment Plant (WWTP) was completed in 2006. The WWTP has a capacity of 800 PE. The WWTP consists of a package plant with primary settlement, use of a Rotating Biological Contact, followed by secondary treatment. The WWTP has one discharge point, into the Cross River (see Figure 3.1 below).

The WWTP is designed to treat effluent to a standard of 25mg/l BOD, 125mg/l COD and 35mg/l Suspended Solids. The average volume currently discharged from the WWTP is estimated at 31.95m3/day at DWF (maximum daily flow of 95.85 m3/day), equivalent to a maximum loading of 0.86265 kg/d BOD (27mg/l), 0.99045 kg/d Suspended Solids (31mg/l) and 0.30189555kg/d Total Phosphorus (9.449 mg/l).

Figure 3.1 Location of Primary Discharge (SW1P)

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3.2 – Description of Natura 2000 Site

Name: Lough Corrib SAC and pNHA (Site Code 000297)

(see Appendix A for site synopses)

- Lough Corrib is situated to the North of Galway City and is the second largest lake in Ireland and it comprises an area of approximately 18,240 ha. The site is designated for the following 14 Annex 1 habitats of EU Habitats Directive.

Hard oligo-mesotrophic waters with benthic vegetation of Chara Spp

Oligotrophic waters containing very few minerals of sandy plains (Littorelletalia uniflorae) (approx 3% cover)

Active raised bogs

Old Sessile Oak Woods with IIex and Blechnum in British Isles

Molinia meadows on calcareous, peaty or clavey-silt-laden soils (Molinion caeruleae)

Alkaline fens

Calcareous fens with Cladium mariscus and species of the Caricion davalllianae

Limestone pavements

Semi-natural dry grasslands and scrubland facies on calcareous substrates (Festuco Brometalia) (*important orchid sites)

Bog woodland

Water courses of plain to montane levels with the Ranunculion fluitantis and Callitricho-Batrachion vegetation

Petrifying springs with tufa formation (Cratoneurion)

Degraded raised bogs still capable of natural regeneration

Depressions on peat substrates of the Rhynchosporion

Six of these habitats are priority habitats:

- Petrifying Spring (habitat code 7220) (approx 1% of the site)

- Cladium Fen (habitat code 7210) (approx 1% of the site)

- Active Raised Boy (habitat code 7110) (approx 1% of the site)

- Limestone Pavement (habitat code 8240) (approx 1% of the site)

- Bog Woodland (habitat 91DO) ( approx 1% of the site)

- Orchid-rich calcareous grassland (habitat code 6210) (approx 1% of the site).

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This site has also a number of species present that are listed in Annex II of the Habitats Directive.

Site name Species

code Species name Lough Corrib 1095 Petromyzon marinus Lough Corrib 1106 Salmo salar Lough Corrib 1096 Lampetra planeri Lough Corrib 1303 Rhinolophus hipposideros Lough Corrib 1355 Lutra lutra Lough Corrib 1092 Austropotamobius pallipes Lough Corrib 1029 Margaritifera margaritifera Lough Corrib 1833 Najas flexilis Lough Corrib 1393 Drepanocladus vernicosus

The Lough Corrib site consists of hard oligo-mesoptrophic waters with benthic vegetation of Chara spp. (approx 85% cover of the site) to the south and oligotrophic waters containing very few mineral of sandy plains (Litterolletalia uniflorae) (approx 3% cover of the site) to the north.

The site has four discrete raised bog areas and is selected for active raised bog, degraded raised bog, Rhynchosporion and Bog Woodland. Active raised bog consists of areas of high bog that are both wet and are actively peat forming (at Addergoole on the eastern shores of Lough Corrib there is an important example of western raised bog). Degraded raised bogs are those areas of high bog whose hydrology have been affected by peat cutting, drainage & other land use activities but they are capable of regeneration, however these degraded bogs are generally species poor due to disturbance and or drying out. The Rhynchosporion habitat occurs in wet depressions and is best represented at Addergoole on the Eastern shores of Lough Corrib. Bog Woodlands are generally dominated by Birch and covers approximately 1% of the Lough Corrib Site.

The limestone pavement areas which occur along the shoreline of the lower Corrib Basin support three red data book species including Alder Buckthorn, Shrubby Cinquefoil and Wood Bitter-Vetch – the latter species is protected under the Flora (Protection) Order 1999.

In the case of the Orchid-rich calcareous grassland areas there area a wide variety of orchids and plants found in the Lough Corrib habitat including the Frog Orchid and Irish Lady’s tresses – the latter species is protected under the Flora (Protection) Order 1999.

The lake supports waterfowl including Tufted Duck and Greenland White-fronted Goose – the latter species is listed on Annex 1 of the Birds Directive. Other species include Whooper Swan, Coot, Kingfisher, Hen Harrier and Gold Plover – all of these species are listed on Annex 1 of the EU Birds Directive. Mammal Red Data Book species include the Otter and Irish Hare are also associated with this site.

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Name: Lough Corrib SPA (Site Code 004042)

The ornithological importance of the site enhances the conservation value of this site, with a nationally important population of Tufted Duck. This site is also of international importance for waterfowl including Whooper Swan, Greenland White-fronted Goose, Golden Plover, Common Tern and Arctic Term – these are listed on Annex 1 of the EU Birds Directive. The Common Scoter is also present on the site and is a Red Data Book Species. The lake is a renowned Salmonid fishery and is a designated Salmonid Water under SI No 293/1988 European Communities (Quality of Salmonid Waters Regulations 1988). It also supports a range of species listed in Annex II of the EU Habitats Directive including Otter and Slender naiad.

Name: Clyard Kettle-holes SAC (Site Code 000480)

This site comprises a number of small lakes and turloughs developed between stony hillocks in the moraines west of Kilmaine, Co. Mayo. The site comprises an area of 126.5 ha. The site is designated for two Annex 1 habitats as follows:

- Turlough (Habitat Code 3180) (approx 58% of the site) – Good representivity of this habitat type

- Cladium Calcerous Fen (Habitat Code 7210) (approx 3% of the site) – Good representivity of this habitat type

Note: The Clyard Kettle-holes site is located 1.1 km north of the discharge (not downstream)

Name: Mocorha Lough SAC (Site Code 001536)

This site comprises a shallow wetland complex situated 8 km east of Cong and lying in a linear depression in the Carboniferous limestone running north-east wards from Lough Corrib. The site is designated for one Annex 1 habitat as follows:

- Cladium Fen (Habitat Code 7210) (approx 29% of the site) – Good representivity of this habitat type

Note: The Mocorha Lough is located 1.3 km to the south of the discharge (not downstream)

Name: Shrule Turlough SAC (Site Code 000525)

This site is orientated east-west in an extensive natural basin surrounded by gently undulating farmland, with slightly higher scrub-covered land to the north. The site is designated for one Annex 1 habitat as follows:

- Turlough (Habitat Code 3180) (approx 93% of the site) – Good representivity of this habitat type

Note: The Shurle Turlough is located 3.1 km to the southeast of the discharge (not downstream)

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3.3 – Other projects and plans to be considered ‘in combination’.

There have been 28 planning applications submitted since 2004 within the Agglomeration serviced by the Kilmaine sewerage scheme, 17 of which have been granted planning permission. None of these planning applications were for significant projects or plans that would impact on sites of nature conservation importance, or that would have an impact ‘in combination’ with the Kilmaine WWTP and associated discharges. Planning applications related predominately to residential or ancillary works.

There are no EPA or Mayo County Council licensed facilities within the 5 km buffer area of Kilmaine that would be considered ‘in combination’.

In the Mayo County Development Plan 2008-2014, Kilmaine is classified as a rural village. There is currently no operational local area plan for Kilmaine. The strategic policies of the CDP for small villages such as Kilmaine include policies to strengthen the population base, to support the improvement and enhancement of the physical fabric and environment of the Rural Villages and support the vibrancy of the rural villages (policies CSS-3.1 to CSS-3.11). It is not considered that these policies need to be considered ‘in combination’

Conclusion: There are no projects or plans to be considered ‘in combination’ with the current discharge license application.

3.4 – Assessment Criteria

3.4.1 – Is the development in or on the boundary of the aforementioned nature conservation sites?

No, discharges from the Kilmaine WWTP are not located within any of the aforementioned nature conservation sites (see Figure 1.1)

3.4.2 – Will nationally protected species be directly impacted? Wildlife Acts (1976 and 2000), Flora Protection Order (S.I. 94 of 1999)?

Flora Protection Order Species:

A data search of the National Parks & Wildlife 10 km survey grids (M15 & M25) via both the National Parks website and datasets obtained from the NPWS have recorded the presence of Chives (Allium schoenoprasum) at 6 sites, Drooping Lady’s Tresses (Spiranthes romanzoffiana) at 2 sites (no specific location within the M15 grid) and Wood small-reed (Calamagrostis epigejos) at 1 site. All of the above records are from the 1890’s -1999 and the closest record is for the Wood small-reed (recorded in 1934) located approximately >7km Southwest of the WWTP’s discharge point. According to the 1988 ‘Irish Red Databook’ the population of Wood small-reed species is declining however, the cause is unknown. It is considered that given the distance from the WWTP and associated discharge, the development appears not to impact directly on this species

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Wildlife Acts Species:

A data search of the National Parks & Wildlife 10 km survey grids (M15 & M25) via both the National Parks website and datasets obtained from the NPWS have recorded the presence of Otter (Lutra lutra), Pine Marten (Martes martes) and Stoat (Mustela erminea). The National Parks & Wildlife datasets have also recorded Common Frog and Freshwater Crayfish. Otter, Common Frog and Freshwater Crayfish are water dependent. The closest Common Frog record (Frog stage 1 frog spawn) is on the Kilmaine Road Ballinrobe located approximately >6km from 2003.

There are 2 records of Otter within the adjacent 10 km grid squares, with the closest record of an Otter sited in 1990 at Gortatober, located approximately 8km Southwest of the discharge point. There are also 2 records of Stoat within the adjacent 10 km grid squares, with the closest record of a Stoat sited in 1990 at Gortatober, located approximately 8km Southwest of the discharge point. Otter and Stoat populations have the potential to be indirectly impacted from water quality impacts from the WWTP, as these may affect food sources for the both species. However, given the distance from the primary discharge it is considered that these species will not be directly impacted. The Pine Marten record recorded in 1991 is at Inishdoorus Islands, Lough Corrib, located approximately 15 km Southwest of the discharge point.

Freshwater Crayfish have been recorded the Corrib/Mask in 2005. Lough Corrib is located >5km Southwest of the discharge. The population status is favourable although the overall conservation status for future prospects for the species is unfavourable-inadequate, due to the reduction of range and locality number and continuing pressures (Reynolds, 2007). Crayfish require moderate to good water quality with water quality Q-ratings of less than 3 deemed unsuitable to support this species (Reynolds, 2007). Ideally water quality should be maintained at 3-4 or greater to support this species although the species is found within Q3 water quality. Currently, there is no monitoring data available for the Cross river, but it is to be included in the WFD program in the future. The EPA ‘Water Quality in Ireland Report 2004-2006’ classified Lough Corrib as mesotrophic under the Western River Basin District i.e. in a satisfactory condition. The catchment is characterized by calcareous bedrock. Thus, it appears that both water quality and bedrock within the study area are suitable for this species.

The discharge from Kilmaine WWTP is within the waste assimilative capacity for Ammonia, BOD and Suspended Solids – see Appendix B; however with this one sample taken for the Wastewater Discharge Application it appears not to be within waste assimilative capacity for Ortho-phosphorus, this may lead to a deterioration of the river water quality. In the Corrib Water Management Unit Plan it states that there are no perceived risks from Mayo WWTP’s, but that generally, overall 90% of Total Phosphorus is diffuse in nature, with agriculture within the catchment accounting for 80% of Total Phosphorus. It also states that measures must be taken to address these sources from agriculture in order to achieve good status by 2015. It appears that given the distance from the WWTP and associated discharge, the development does not present a risk to water quality and to these Wildlife Act species.

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3.4.3 – Is the development a surface water discharge or abstraction in the surface water catchment or immediately downstream of a nature conservation site with water dependant qualifying habitats/species?

There are SAC’s designated for Turlough, Kettle-holes and two Loughs within the wider catchment, however, under section 3.2 above, none of these Turlough, Kettle-holes and Loughs are located immediately downstream of the discharge and therefore the discharge does not impact directly on these SAC’s/pNHA/SPA.

3.4.4 – Is the development a groundwater discharge or abstraction in the ground water catchment or within 5km of a nature conservation site with water-dependant qualifying habitats/species?

No, the development is a surface water discharge.

3.4.5 - Is the development in the surface water or groundwater catchment of salmonid waters?

The Cross River is not designated salmonid, however it is a tributary of Lough Corrib (located > 5 km downstream of the development) which is designated Salmonid. In 2010 the Western Regional Fisheries Board Angling Reports (www.wrfb.ie/publications) states that trout numbers in the lake are high and July appears to be the best month for salmon fishing.

3.4.6 – Is the treatment plant in an active or former floodplain or flood zone of a river, lake etc.?

The WWTP is located with ‘benefiting lands’, lands identified by the Office of Public Works that might benefit from the implementation of Arterial (Major) Drainage Schemes (under the Arterial Drainage Act 1945) and indicating areas of land subject to flooding or poor drainage. The nearest flood event recorded by the OPW (www.floodmaps.ie) occurred near Ballynacarragh in January 1995 (which is located approx. 1km from the discharge point).

3.4.7 – Is the development of a surface discharge or abstraction to or from marine waters and within 3km of a marine nature conservation site? No.

3.4.8 –Will the project in combination with other projects (existing and proposed) or changes to such projects affect the hydrology or water levels of sites of nature conservation interest or the habitats of protected species?

No. A review of all planning applications in the agglomeration since 2004 (Source: Mayo County Council GIS database), shows no major development has been proposed that would affect the hydrology or water levels of sites of nature conservation interest or the habitats of protected species. The WWTP discharge represents only 1.8% of the 95%tile flow of the river and only 5.5% of the Dry Weather Flow of the Cross River. In the Western River Basin District there is a Corrib Water Management Unit Action Plan, which states that there are no perceived risks from Mayo WWTP’s (including Kilmaine WWTP) within the WMUAP.

3.4.9 – Conclusion:

It is considered that an Appropriate Assessment is not required.

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http://www.wrfb.ie/publications

http://www.floodmaps.ie/


4. FINDINGS OF SIGNIFICANT EFFECTS REPORT MATRIX

4.1 – Name of project or plan Kilmaine Wastewater Treatment Plant Discharge License Application

4.2 - Name and location of Natura 2000 sites Lough Corrib (Site Codes 000297) located >5km Southwest of discharge

Clyard Kettle Holes (Site Code 480) located approximately 1.1 km to the north of discharge (not downstream)

Mocorha Lough (Site Code 1536) located 1.3 km to the south of discharge (not downstream)

Shrule Turlough (Site Code 525) located 3.1 km southeast of discharge (not downstream)

4.3 - Description of the project or plan As 3.1 above.

4.4 - Is the project or plan directly connected with or necessary to the management of the site (provide details)?

No

4.5 - Are there other projects or plans that together with the project or plan being assessed could affect the site (provide details)?

No

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5. – THE ASSESSMENT OF SIGNIFICANCE OF EFFECTS

5.1 - Describe how the project or plan (alone or in combination) is likely to affect the Natura 2000 site.

L8/08 states that if the screening process under section 3 above is to “Assess Impacts” then the project must be referred to the DEHLG Development Applications Unit (DAU).

The Kilmaine WWTP and associated discharge will not impact on any Natura site.

5.2 - Explain why these effects are not considered significant.

There are no Natura 2000 sites immediately downstream of the WWTP and associated discharge that would be impacted by the sewerage scheme.

5.3 - List of Agencies Consulted: Provide contact name and telephone or e-mail address:

1. Rebecca Quinn EPA Office of Environmental Assessment, Clonskeagh, Dublin 14. email [email protected]

2. EPA Regional Inspectorate Castlebar, Co. Mayo

3. NPWS Website www.npws.ie

5.4 - Response to Consultation

Email correspondence from Rebecca Quinn

Email correspondence from EPA Regional Inspectorate Castlebar

GIS Datasets on known species/habitat distribution obtained from NPWS.

DATA COLLECTED TO CARRY OUT THE ASSESSMENT SCREENING

Who carried out the Appropriate Assessment Screening?

Maria McLoughlin Environment Section

Sources of data

Any available data was assessed from the following websites, WFD Ireland, Western RBD, National Biodiversity Data Centre, Department of Environment Heritage and Local Government, and National Parks and Wildlife. See References/Sources of report.

Level of Assessment

Desk top study by Maria McLoughlin Environment Section Mayo County Council.

Where can the full results of the Assessment Screening be accessed and viewed?

Water Services Capital Works Section, Mayo County Council.

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mailto:[email protected]

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REFERENCES

Clabby, K.J., Bradley, C., Craig, M., Daly, D., Lucey, J., McGarrigle, M., O’Boyle, S., Tierney, D. and Bowman, J. (2008). Water Quality in Ireland 2004 – 2006. Environmental Protection Agency, Wexford.

Department of Environment, Heritage and Local Government (2008) Circular L8/08. Water Services Investment and Rural Water Programmes – Protection of Natural Heritage and National Monuments.

EC (2000) Managing Natura 2000 Sites: The provisions of Article 6 of the ‘Habitats’ Directive 92/43/EEC.

EC (2001) Assessment of plans and projects significantly affecting Natura 2000 sites: Methodological guidance on the provisions of Article 6(3) and (4) of the Habitats Directive 92/43/EEC.

EPA (2008) Wastewater Discharge Licensing Appropriate Assessment: Note on Appropriate Assessments for the purposes of the Waste Water Discharge (Authorisation) Regulations, 2007 (S.I. No. 684 of 2007).

Guidance document on Article 6(4) of the ‘Habitats Directive’ 92/43/EEC.

Mayo County Council (2008). Mayo County Development Plan 2008 – 2014. Mayo County Council, Castlebar.

NPWS (2008). The Status of EU Protected Habitats and Species in Ireland. Conservation Status in Ireland of Habitats and Species listed in the European Council Directive on the Conservation of Habitats, Flora and Fauna 92/43/EEC.

NPWS, Northern Ireland Environment Agency (2009) Ireland Red List No.3 Terrestrial Mammals

NPWS (Unknown). Turlough (3180) Conservation Status Assessment Report. NPWS, Dublin.

Reynolds, J.D (2007). Conservation assessment of the white-clawed crayfish, Austropotamobius pallipes (Lereboullet, 1858) in Ireland. Report to NPWS.

Wildlife Service Ireland (1988). The Irish Red Data Book 1 Vascular Plants

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APPENDIX A – SITE SYNOPSES FOR SACS

SITE NAME: CLYARD KETTLE-HOLES SITE CODE: 000480 This site comprises a number of small lakes and turloughs developed between stony hillocks in the jumbled topography of the moraines west of Kilmaine, Co. Mayo. Some of these lakes are connected with each other but others appear to fill and empty by subterranean means. As is often the case with such features, apparently small physical differences have led to wide divergences in the development of vegetation in each basin. The site is a candidate SAC for Cladium fen and turlough, both habitats listed with priority status on Annex I of the EU Habitats Directive. The main plant community in the kettle-holes at Clyard townland is Cladium fen, dominated by Saw Sedge (Cladium mariscus) with Black Bog-rush (Schoenus nigricans) and Slender Sedge (Carex lasiocarpa). Clear shallow water areas are filled by stoneworts (Characeae). Dense reedbeds are found in deeper waters, formed by Common Club-rush (Scirpus lacustris) and Common Reed (Phragmites australis), with conspicuous tussocks of Greater Tussock-sedge (Carex paniculata) and Tufted-sedge (Carex elata). A more species rich community, formed largely of Tubular Water-dropwort (Oenanthe fistulosa) and Bog Bean (Menyanthes trifoliata), occurs in quaking marsh areas. More eutrophic plants such as Nodding Bur-marigold (Bidens cernua), Branched Bur-reed (Sparganium erectum), Fool's Water-cress (Apium nodiflorum) and Blue Water-speedwell (Veronica anagallis-aquatica) occur in these communities. Common marsh plants such as Square-stalked St. John's-wort (Hypericum tetrapterum), Marsh Pennywort (Hydrocotyle vulgaris), sedges (Carex nigra, C. rostrata) and Grass-of-parnassus (Parnassia palustris) are widely distributed, while Knotted Pearlwort (Sagina nodosa), Meadow Thistle (Cirsium dissectum) and Marsh Lousewort (Pedicularis palustris) are especially associated with the fen. To the north of Clyard in Coolisduff townland lies a turlough that floods in winter to an area of 12 ha. The basin is fringed by Gorse (Ulex europaeus) and the inundated vegetation receives a heavy coating of calcium carbonate. This turlough drains to a swallow hole in the north-west corner, with summer pools supporting stands of Saw Sedge. Another turlough lies just to the north, in Thomastown townland. The southern end of this turlough contains damp grassland vegetation, with Creeping Bent (Agrostis stolonifera), Creeping Buttercup (Ranunculus repens) and mosses such as Calliergonella cuspidata. The northern part is wetter, with Silverweed (Potentilla anserina), and contains two pools. Two further turlough areas occur to the west, at Cahernagry East, which floods to an area of 12 ha, and at Caherhemush – Ballywalter, which floods to over 25 ha. This series of turloughs are of interest for conservation as they support good examples of a habitat listed with priority status under the E.U. Habitats Directive. The occurrence of more permanent water bodies in the kettleholes adds considerable diversity to the site. The presence of Cladium fen, a habitat also listed with priority status under the EU Habitats Directive, is of particular conservation importance.

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SITE NAME: MOCORHA LOUGH SITE CODE: 001536 Mocorha Lough comprises a shallow wetland complex situated 8 km east of Cong, in Co. Mayo, and lying in a linear depression in the Carboniferous limestone running north-eastwards from Lough Corrib. The predominant habitat on the site is fen, but areas of dry calcareous grassland, wet grassland and Juniper scrub also occur. Very little open water remains. This site is a candidate SAC selected for Cladium fen, a habitat listed on Annex I of the E.U. Habitats Directive. The site includes a large area of fen vegetation that is dominated by Great Fen-sedge (Cladium mariscus), accompanied by some Common Reed (Phragmites australis) and Common Club-rush (Scirpus lacustris). Areas of fen dominated by Black Bog-rush (Schoenus nigricans) are scattered through the site, but are particularly well-developed near the southern and northern margins of the site. The scarce moss Drepanocladus cossonii has been recorded from Schoenus fen in the north of the site. Surrounding high ground near the centre of the site are areas of calcareous heath/grassland vegetation which are notable for the presence of Juniper (Juniperus communis). Juniper occurs here in abundance, along with such species as Black Bog-sedge, Bell Heather (Erica cinerea), Ling Heather (Calluna vulgaris), Crested Dog’s-tail (Cynosurus cristatus), Common Knapweed (Centaurea nigra), Blue Moor-grass (Sesleria albicans), Wild Thyme (Thymus praecox), Devil’s-bit Scabious (Succisa pratensis), Ox-eye Daisy (Leucanthemum vulgare), Bracken (Pteridium aquilinum), amongst others. Areas of heathy calcareous grassland with Juniper are also found on the western margin of the site. Mocorha Lough is of considerable conservation significance as it supports one of the largest stands of Great Fen-sedge in the west of Ireland. This habitat is listed on Annex I of the E.U. Habitats Directive with priority status. The presence of areas of heathy calcareous grassland, Juniper scrub and Schoenus fen adds considerably to the importance of the site. The site also supports locally important numbers of wetland birds especially Snipe and Mallard.

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D0361-01 Appendix A

SITE NAME: SHRULE TURLOUGH SITE CODE: 000525 Shrule Turlough is orientated east-west in an extensive natural basin surrounded by gently undulating farmland, with slightly higher scrub-covered land to the north. Around the edges of the turlough there are scattered boulders and some limestone outcrops. It is a large, highly oligotrophic turlough, with thick marl and peat deposits. There is no above-ground outflow from the turlough. Drainage attempts have been made by enlarging the swallow holes but the turlough still floods regularly and it seems to show little modification due to the drainage efforts. Peat cutting no longer occurs but cattle still graze on reclaimed peat margins and around the swallow holes. It has a high level of physical and vegetational diversity, and supports the second largest number of plant communities of any turlough (18 in all). Fen vegetation is especially well-developed, with the largest extent of Great Fen-sedge (Cladium mariscus) fen and Black Bog-rush (Schoenus nigricans) fen communities found in any turlough occurring. The site also supports important stands of Tall Sedge and Yellow-sedge communities. The site supports a range of plants that are quite rare in turloughs, among them Whorled Water-milfoil (Myriophyllum verticillatum), Least Bur-reed (Sparganium minimum), Greater Bladderwort (Utricularia vulgaris) and Creeping Yellow-Cress (Rorippa sylvestris). Lough Lee, located at the southern end of the site, is surrounded by wet grassland and, at its northern side, by a mosaic of species-rich wet and dry grassland with outcropping limestone. The lough itself supports beds of Common Reed (Phragmites australis). Shrule turlough has a small catchment area and seems to be little modified by human behaviour. The oligotrophic and peaty nature of the site makes it unusual in the general range of turloughs and gives it a very significant ecological value. In addition, the site is large and seemingly largely uninfluenced by the surrounding land uses. Its high vegetation diversity and the presence of a number of species generally rare in turloughs is of further interest

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SITE NAME : LOUGH CORRIB SITE CODE : 000297 Lough Corrib is situated to the north of Galway city and is the second largest lake in Ireland with an area of approximately 18,240 ha (the entire site is 20,556 ha). The lake can be divided into two parts: a relatively shallow basin, underlain by Carboniferous limestone, in the south and a larger, deeper basin, underlain by more acidic granite, schists, shales and sandstones, to the north. The surrounding lands are mostly pastoral farmland, to the south and east, and bog and heath, to the west and north. In addition to the lake basin, adjoining areas of conservation interest, including woodland, grassland and limestone pavement, have been incorporated into the site. This site is of major conservation importance and includes twelve habitats listed on Annex I of the EU Habitats Directive. Six of these are priority habitats - petrifying springs, Cladium fen, active raised bog, limestone pavement, bog woodland and orchid-rich calcareous grassland. The other annexed habitats present include hard water lakes, lowland oligotrophic lakes, floating river vegetation, alkaline fens, Molinia meadows and old Oak woodlands. The shallow, lime-rich waters of the southern basin the of lake support one of the most extensive beds of Stoneworts (Charophytes) in Ireland, with species such as Chara aspera, C. hispida, C. delicatula, C. contraria and C. desmacantha mixed with submerged Pondweeds (Potamogeton perfoliatus, P. gramineus and P. lucens), Shoreweed (Littorella uniflora) and Water Lobelia (Lobelia dortmanna). These Chara beds are an important source of food for waterfowl. In contrast, the northern basin contains more oligotrophic and acidic waters, without Chara species, but with Shoreweed, Water Lobelia, Pipewort (Eriocaulon septangulare), Quillwort (Isoetes lacustris), Alternate Water-milfoil (Myriophyllum alternifolium) and Slender Naiad (Najas flexilis). The last-named is listed under the Flora (Protection) Order, 1999 and is an Annex II species under the EU Habitats Directive. Large areas of reedswamp vegetation, dominated by varying mixtures of Common Reed (Phragmites australis) and Common Club-rush (Scirpus lacustris), occur around the margins of the lake. Reedswamp usually grades into species-rich marsh vegetation characterised by Slender Sedge (Carex lasiocarpa), Water Mint (Mentha aquatica), Water Horsetail (Equisetum fluviatile) and Bog Bean (Menyanthes trifoliata). Of particular note are the extensive beds of Great Fen-sedge (Cladium mariscus) that have developed over the marly peat deposits in sheltered bays, particularly in the south-east corner of the lake. Alkaline fen vegetation is more widespread around the lake margins and includes, amongst the typically diverse range of plants, the Slender Cottongrass (Eriophorum gracile), a species protected under the Flora (Protection) Order, 1999. Wet meadows dominated by Purple Moor-grass (Molinia caerulea) occur in seasonally flooded areas close to the lake shore. These support species such as Sharp-flowered Rush (Juncus acutiflorus), Jointed Rush (J. articulatus), Carnation Sedge (Carex panicea), Devil’s-bit Scabious (Succisa pratensis), Creeping Bent (Agrostis stolonifera) and Tormentil (Potentilla erecta), amongst others.

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Active raised bog occurs at Addergoole, on the south-east shore of the lake 5 km north of Galway city, between the Clare and Cregg rivers. This is one of the most westerly intact raised bogs in the country and has well developed surface features including as bog pools dominated by Sphagnum cuspidatum. The bog also supports a stand of bog woodland, dominated by Downy Birch (Betula pubescens), which has developed in a soak system. Soaks are now a very rare feature of Irish raised bogs. Limestone pavement occurs along much of the shoreline in the lower Corrib basin and supports a rich and diverse flora, including Herb-robert (Geranium robertianum), Bloody Crane’s-bill (G. sanguineum), Carline Thistle (Carlina vulgaris), Spring Gentian (Gentiana verna), Wild Thyme (Thymus praecox), Rustyback (Ceterach officinarum), Wood Sage (Teucrium scorodonia), Slender St. John’s-wort (Hypericum pulchrum), Quaking-grass (Briza media) and Blue Moor-grass (Sesleria albicans). Areas of Hazel (Corylus avellana) scrub occur in association with exposed limestone pavement and these include species such as Hawthorn (Crataegus monogyna), Buckthorn (Rhamnus catharticus), Spindle (Euonymus europaeus) with occasional Juniper (Juniperus communis). Three Red Data Book species are also found in association with limestone scrub - Alder Buckthorn (Frangula alnus), Shrubby Cinquefoil (Potentilla fruticosa) and Wood Bitter-vetch (Vicia orobus), the latter is also protected under the Flora (Protection) Order, 1999. Open areas of orchid-rich calcareous grassland are also found in association with the limestone exposures. These can support a typically rich vegetation, including many orchids such as Pyramidal Orchid (Anacamptis pyramidalis), Common Spotted-orchid (Dactylorhiza fuchsii), Early-purple Orchid (Orchis mascula), Frog Orchid (Coeloglossum viride), Fragrant Orchid (Gymnadenia conopsea), Marsh Helleborine (Epipactis palustris), Greater Butterfly-orchid (Platanthera chlorantha) and Irish Lady’s-tresses (Spiranthes romanzoffiana). The latter is protected under the Flora (Protection) Order, 1999. The Hill of Doon, located in the north-western corner of the lake, is a fine example of a Sessile Oak (Quercus petraea) woodland. The understorey is dominated by Sessile Oak, Holly (Ilex aquifolium) and occasional Juniper. There are occasional Yew (Taxus baccata) and Ash (Fraxinus excelsior) and a well developed ground layer dominated by Bilberry (Vaccinium myrtillus), Hard Fern (Blechnum spicant) and Wood Rush (Luzula sylvatica). Woodland also occurs on some of the islands in the lake. The lake is rated as an internationally important site for waterfowl. Counts from 1984 to 1987 revealed a mean annual peak total of 19,994 birds. In the past a maximum peak of 38,281 birds was recorded. The lake supports internationally important numbers of Pochard (average peak 8,600) and nationally important numbers of the following species: Coot (average peak 6,756), Mute Swan (average peak 176), Tufted Duck (average peak 1,317), Cormorant (average peak 110) and Greenland White-fronted Goose (average peak 83). The latter species is listed on Annex I of Birds Directive. The Coot population is the largest in the country and populations of Tufted Duck and Pochard are second only to Lough Neagh. 30-41 breeding pairs of Common Scoter occur on the lake (1995 data) as well as breeding populations of Arctic Tern and Common Tern. Other bird species of note recorded from or close to the lake recently include Hen Harrier, Whooper Swan, Golden Plover and Kingfisher. All of these species are listed on Annex I of the EU Birds Directive.

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Otter and Irish Hare have been recorded regularly within this site. Both of these species are listed in the Red Data Book and are legally protected by the Wildlife Act 1976. Lough Corrib is also a well known fishing lake with a very good Trout (Salmo trutta) fishery. The lake has a population of Sea Lamprey (Petromyzon marinus), a scarce, though probably under-recorded species listed on Annex II of the EU Habitats Directive. Atlantic Salmon (Salmo salar) use the lake as spawning grounds. Although this species is still fished commercially in Ireland, it is considered to be endangered or locally threatened elsewhere in Europe and is listed on Annex II of the Habitats Directive. A population of Freshwater Pearl-mussel (Margaritifera margaritifera), a species listed on Annex II of the EU Habitats Directive, occurs within the site. White-clawed Crayfish (Austropotamobius pallipes), also listed on Annex II, has been recorded in the lake. A summer roost of Lesser Horseshoe Bat (Rhinolophus hipposideros), another Annex II species, occurs within the site - approximately 100 animals were recorded here in 1999. The main threats to the quality of this site are from water polluting activities resulting from intensification of agricultural activities on the eastern side of the lake, uncontrolled discharge of sewage which is causing localised eutrophication of the lake, and housing and boating development, which is causing the loss of native lakeshore vegetation. Fishing and shooting occur in and around the lake. Introduction of exotic crayfish species or the crayfish fungal plague (Aphanomyces astaci) could have a serious impact on the native crayfish population. The bat roost is susceptible to disturbance or development. Peat cutting threatens Addergoole Bog and already a substantial area of it has been cut away. Despite this ongoing interference however, Lough Corrib is one the best examples of a large lacustrine system in Ireland, with a range of habitats and species still well represented. The lake itself is internationally important for birds and is designated as a Special Protection Area. 27.09.02

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SITE NAME: LOUGH CORRIB SPA SITE CODE: 004042 Lough Corrib is situated to the north of Galway City and is the largest lake in the country. The lake can be divided into two parts: a relatively shallow basin, underlain by Carboniferous limestone, in the south and a larger, deeper basin, underlain by more acidic granite, schists, shales and sandstones, to the north. The main inflowing rivers are the Black, Clare, Dooghta, Cregg, Owenriff and the channel from Lough Mask. The main outflowing river is the Corrib, which reaches the sea at Galway City. Over the 1994-97 period Lough Corrib was classified as a mesotrophic system, a change from its oligo/mesotrophic status in the 1991-94 period. It retained its mesotrophic status for the 1998-2000 period, with a reduction in phosphorous and planktonic algal growth noted. Overall, the water quality of the Corrib is considered to be satisfactory. The shallow, lime-rich waters of the southern basin of the lake support one of the most extensive beds of Stoneworts (Charophytes) in Ireland, with species such as Chara aspera, C. hispida, C. delicatula, C. contraria and C. desmacantha mixed with submerged Pondweeds (Potamogeton perfoliatus, P. gramineus and P. lucens), Shoreweed (Littorella uniflora) and Water Lobelia (Lobelia dortmanna). These Chara beds are a very important source of food for waterfowl. In contrast, the northern basin contains more oligotrophic and acidic waters, largely lacking Charophyte species, but with such species as Shoreweed, Water Lobelia, Pipewort (Eriocaulon aquaticum) and Quillwort (Isoetes lacustris). Large areas of reedswamp vegetation, dominated by varying mixtures of Common Reed (Phragmites australis) and Common Club-rush (Scirpus lacustris), occur around the margins of the lake. Reedswamp usually grades into species-rich marsh vegetation. Of particular note are the extensive beds of Great Fen-sedge (Cladium mariscus) that have developed over the marly peat deposits in sheltered bays. Limestone pavement occurs along much of the shoreline in the lower Corrib basin and supports a rich and diverse flora. The lake has numerous islands, from rocky islets to larger islands with grassland or woodland. The surrounding lands are mostly pastoral farmland, to the south and east, and bog and heath, to the west and north. Lough Corrib is of international importance for wintering Pochard (10,182) - all figures are average peaks for the 5 seasons 1995/96-1999/00. It is one of the top five sites in the country for wintering waterfowl and also qualifies for international importance because it regularly supports well in excess of 20,000 waterfowl. It is the most important site in the country for Pochard, Tufted Duck (5,521) and Coot (14,473), supporting 21%, 46% and 13% of the respective national totals. It also has nationally important populations of wintering Mute Swan (182), Gadwall (48), Shoveler (90), Golden Plover (1,727) and Lapwing (2,424). The lake is a traditional site for Greenland White-fronted Goose (62). Relatively small numbers of Whooper Swan (35) occur, along with Wigeon (528), Teal (77), Mallard (155), Goldeneye (74), Curlew (114) and Cormorant (36).

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D0361-01 Appendix A

Lough Corrib is a traditional breeding site for gulls and terns, with various islands being used for nesting each year. There are important colonies of Common Tern (37 pairs in 1995) and Arctic Terns (60 pairs in 1995), both populations being of national importance. The site supports substantial colonies of Black-headed Gull (856 individuals in 1999) and Common Gull (181 pairs in 1999), these representing 11% and 17% of the respective national totals. Lesser Black-backed Gull (51 individuals in 1999) and Great Black-backed Gull (16 individuals in 1999) also breed, with a few pairs of Herring Gull. Considerably higher numbers of breeding gulls occurred in the recent past, as shown by surveys in 1977 and 1993; the reasons for the continued declines are, however, not fully known. Whilst only colonised in the 1970/80s by nesting Common Scoter, Lough Corrib now supports approximately half of the national population of this rare duck, a Red Data Book species. The population has been stable since the mid-1990s, with 36 pairs recorded in the most recent survey in 1999. Lough Corrib supports a range of species listed on Annex II of the E.U. Habitats Directive, including Otter, Salmon and Slender Naiad (Najas flexilis). The lake is an internationally renowned salmonid fishery. Any deterioration in water quality of the lake would be of concern for the wintering birds and perhaps the breeding Common Scoter, though the condition of the lake has been satisfactory in recent years. The reasons for the long-term declines in the breeding gull populations since the 1970s are not known and require investigation. Fishing and shooting occur in and around the lake though is it not considered that these are significant threats to the birds. Lough Corrib is one of the top ornithological sites in the country, and easily qualifies for international importance on the basis of numbers of wintering birds using it. It is also of international importance for its population of Pochard. There are a further seven species of wintering waterfowl that have populations of national importance. Its populations of breeding gulls and terns are also notable, with nationally important numbers of Common Tern, Arctic Tern, Common Gull and Black-headed Gull. The site is now the most important in the country for nesting Common Scoter. It is of note that several of the species which occur regularly are listed on Annex I of the E.U. Birds Directive, i.e. Whooper Swan, Greenland White-fronted Goose, Golden Plover, Common Tern and Arctic Tern. The site has been relatively well monitored for birds in recent years. Research is required into the reasons for the decline of the breeding gull populations.

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APPENDIX B – WASTE ASSIMILATIVE CAPACITY (WAC) CALCULATIONS

Dilution Rate:

No. Dilutions = Flow in receiving water (m3/d) / WWTP discharge volume (m3/d) = 1728 / 95.85 = 18.03 (Dilution Rate for WWTP)

WAC Calculation:

WAC (kg/d) = (Cmax-Cback) * F95 (m3/s) * 86.4

Where Cmax = max permissible concentration in receiving water (based on achieving ‘good status’ under the EC Environmental Objectives (Surface Waters) Regulations 2009).

Cback = background (upstream) concentration (mg/l) F95 = 95% flow in receiving river (m3/s)

WAC for BOD = (2.6 - 1) * 0.06 * 86.4 = 8.3kg/day BOD

(Using ‘Good Status’ for Cmax and results of aSW1u sample for Cback)

WAC for Suspended Solids = (25 - 2) * 0.06 * 86.4 = 119kg/d SS

(Using Salmonid Regulations for Cmax and results for aSW1u sample for Cback)

WAC for Ortho-phosphorus = (0.075 - 0.017) * 0.06 * 86.4 = 0.3kg/d Ortho-phosphorus

(Using ‘Good Status’ 95%ile for Cmax, results for aSW1u sample for Cback and 95%ile flow in receiving water)

WAC for Ammonia = (0.14 - 0.005) * 0.06 * 86.4 = 0.69kg/d Ammonia

(Using ‘Good Status’ for Cmax and results for aSW1u sample for Cback)

Loadings from WWTP:

Loading (kg/d) = {discharge concentration (mg/l) x discharge flow (m3/d)} / 1000

Where discharge concentrations are based on maximum concentrations provided in Table D.1(i) of the discharge license application and flows are based on dry weather flow (DWF) included in section C.1.2 of the discharge licence application.

WWTP BOD loading = (27 * 95.85) / 1000 = 2.59kg/day BOD (within WAC)

WWTP SS loading = (31 * 95.85) / 1000 = 2.97kg/day SS (within WAC)

WWTP Ortho-phosphorus loading = (8.321 * 95.85) / 1000 = 0.8kg/day Ortho-P (not within WAC)

WWTP Ammonia loading = (3.899 * 95.85) / 1000 = 0.37 kg/day Ammonia (within WAC)

D0361-01 Appendix B

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APPENDIX C – Flow Chart from Appendix 1 of Circular L8/08 from DoEHLG.

1. Is the development in a nature conservation site?

No the development discharges to Cross River

2a. (If the development involves a surface water discharge) Is the development in a surface water catchment of a nature conservation site (or part of such a site)?

No the Cross River is a tributary of Lough Corrib which is located >5km from discharge point

4. Is the development in the surface or groundwater catchment of other water dependant Annex II species, other rare or protected species or salmonoid waters?

YES*(however sites and species are not immediately downstream of development and the Cross River is not salmonid).

No further action required

Note*: Justification for no further action required despite yes to 4 detailed in section 5.2 of screening report above.

D0361-01 Appendix C

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Documents

Do Thag. / Your Ref. At- - Environmental Protection Agency · Kilmaine Waste Water Discharge Licence Application – Appropriate Assessment Screening 1. INTRODUCTION Mayo County Council,