Aquatic Assessment of the Derry and Slaney Rivers
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Aquatic Assessment of the Derry and Slaney Rivers For inspection purposes only. Prepared byConsent Triturus of copyright Environmental owner required for any other Ltd. use. for AWN on behalf of Duffy Meats T/A Kerry Foods 25th September 2019 ________________________________________ Please cite as: Triturus Environmental Ltd. (2019) Biological Water Quality Assessment of the Derry & Slaney Rivers. Unpublished report prepared for Duffy Meats trading as Kerry Foods. Aquatic Assessment of the Derry & Slaney Rivers 1 EPA Export 25-04-2020:06:18:44 Contents Introduction ............................................................................ 3 Methodology ............................................................................ 6 Site Descriptions ................................................................. 10 Results .................................................................................... 21 Discussion & Conclusions ................................................ 32 For inspection purposes only. Consent of copyright owner required for any other use. Aquatic Assessment of the Derry & Slaney Rivers 2 EPA Export 25-04-2020:06:18:44 1. Introduction 1.1 Project background Triturus Environmental Ltd. were contracted by AWN consulting on behalf of Duffy Meats (T/A Kerry Foods) to undertake a water quality and aquatic assessment of the Derry and Slaney Rivers. Duffy Meats Ltd. is located approximately 0.5 km south of Shillelagh Village in Co. Wicklow. 1.2 Licensing Requirements The Kerry Foods plant is licensed for ‘treatments or processes for the purposes of the production of food products from animal raw materials (other than milk) with a finished product production capacity greater than 75 tonnes per day’ under license no. PO804-02. The plants emissions to the Derry River are via treated surface water effluent from its biological treatment plant. The current water quality and aquatic assessment was required in light of Kerry Foods industrial emissions licenses (IED) or Integrated Pollution Prevention & Control (IPPC) License. The Aquatic Assessment & Q Sampling was compiled as a requirement under the IED licence, as follows: Schedule C.6 ‘Receiving Water Monitoring’. Under such requirements the license specifically requests that annual Q sampling be undertaken as agreed by the Environmental Protection Agency. 1.3 Site description and fisheries asset The Slaney River rises at Lugnaquilla Mountain and flows 117km to Wexford Harbour, where it enters the Irish Sea. It flows through the towns of Baltinglass, Rathvilly, Tullow, Bunclody, Enniscorthy before discharging into Wexford Harbour at Wexford town. The river is situated in the Slaney catchment (Hydrometric Area 12) and has a catchment area of 1750km2. The Slaney is an important Atlantic salmon river, ranked 7th nationally in terms of the total fluvial habitat accessible to the species (4.38% of national area; McGinnity, 2003). The ForRiver inspection Slaney purposes is aonly. designated Salmonid Water under the first Consent of copyright owner required for any other use. Schedule of the European Communities (Quality of Salmonid Waters) Regulations, 1988 (SI 293 of 1988). The River Slaney is primarily a spring salmon fishery (March – May), the Slaney is regarded as one of the top rivers in Ireland for early season fishing, although in 2018 the river was only open on a catch and release basis due to conservation concerns. This management action has been enforced on numerous occasions in recent times and the general consensus is that the river has never fully recovered from an outbreak of ulcerative dermal necrosis (UDN) disease in the 1960s (Johnston, 2002). The Slaney is also augmented by a small number of grilse and a fair run of sea trout in late June /early July period (Cronin et al., 2013) although the proportion of multi-sea winter (MSW) salmon to grilse is much higher than most other Irish rivers (TEGOS, 2018). The upper Slaney and tributary headwaters are very important for salmonid spawning in the catchment (NPWS, 2011; Macklin & Brazier, 2018). Aquatic Assessment of the Derry & Slaney Rivers 3 EPA Export 25-04-2020:06:18:44 The following aquatic species and habitats are listed as conservation objective species for the Slaney River Valley SAC; • [1029] Freshwater pearl mussel (Margaratifera margaritifera) • [1095] Sea lamprey (Petromyzon marinus) • [1096] Brook lamprey (Lampetra planeri) • [1099] River lamprey (Lampetra fluviatilis) • [1103] Twaite shad (Alosa fallax) • [1106] Atlantic salmon (Salmo salar) (only in fresh water) • [1355] Otter (Lutra lutra) • [1365] Harbour seal (Phoca vitulina) • [3260] Water courses of plain to montane levels with the Ranunculion fluitantis and Callitricho Batrachion vegetation (‘floating river vegetation’) The Derry River tributary of the Slaney River which receives discharge from the Kerry Foods Plant is also included in the Slaney River Valley SAC. The Derry River flows from its source north of Tinahely for 33.8km to it’s confluence with the River Slaney at Killdavin and has a catchment area of 246km2. 1.4 Existing Biological Water Quality (Slaney & Derry Rivers) According to the EPA there are two municipal wastewater treatment plants discharging to the Derry River upstream of the Kerry Foods outfall at Tinahely and Shillelagh. The closest upstream is the Shillelagh Wastewater Treatment Plant (Emission ID TPEFF3400A0542SW001). This plant provides treatment to cater for a PE of 800 (Panther Ltd., 2018). The outfall for this WWTP is located 200 metres upstream of the Kerry Foods effluent discharge outfall and is situated on the west bank of the Derry For inspection purposes only. River approximately 100m downstreamConsent ofof copyright Shillelagh owner requiredBridge for. any other use. The recent European Union Environmental Objectives (Surface Waters) (Amendment) Regulations (S.I. No. 77, 2019) provide for the classification of surface water bodies by the EPA for the purposes of the Water Framework Directive (2000/60/EC). These very recent regulations amend the European Communities Environmental Objectives (Surface Waters) Regulations 2009 ( S.I. No 272 of 2009) by substituting tables 8 and 9 under schedule 5. The Q sampling EQR targets for the ‘High’ and ‘Good’ boundaries remain the same at 0.85 and 0.75 respectively. As with the previous surface water regulations all rivers in “high” or “good” status (as prescribed under the Water Framework Directive 2000/60/EC) should be maintained at their current level, and those surface waters which have been classified as less than “good” status should be improved to at least good status. The most recent biological water quality collected by the EPA during 20161 at Shillelagh Bridge (RS12D020500)2 has specified that water quality is currently Q3-4 (i.e. moderate status) slightly polluted water. The EPA historically collected water quality downstream of Shilleleagh Bridge in the 1 Data accessed from the EPA web mapper on the 10th September 2019; gis.epa.ie/EPAMAPS/ 2 EPA station RS12D020500 at Shillelagh Bridge is at the same location as survey site 3 of this report Aquatic Assessment of the Derry & Slaney Rivers 4 EPA Export 25-04-2020:06:18:44 upstream and downstream vicinity of the outfall but this data is more than 10 years old and therefore is not of value to the current assessment. The next nearest downstream station is at Balisland Bridge (RS12D020700)3. The most recent Q rating collected in 2016 was recorded as Q3-4 (i.e. moderate status) slightly polluted water as with Shillelagh Bridge upstream. The nearest EPA site with data less than 10 years old downstream of the River Derry confluence with the River Slaney was recorded circa. 8km downstream at Slaney Bridge Bunclody (RS12S021800). The biological water quality was recorded as Q4 (good status, unpolluted water quality) at the site during 2016. The nearest upstream biological water quality was recorded at Kilcarry Bridge (RS12S021600)4, circa. 3.5km upstream of the Derry River confluence. A Q rating of Q3-4 (i.e. moderate status) slightly polluted water was recorded by the EPA at this location during 2016. For inspection purposes only. Consent of copyright owner required for any other use. 3 EPA station RS12D020700 at Balisland Bridge is at the same location as survey site 9 of this report 4 EPA station RS12S021600 at Kilcarry Bridge is at the same location as survey site 10 of this report Aquatic Assessment of the Derry & Slaney Rivers 5 EPA Export 25-04-2020:06:18:44 2. Methodology 2.1 Description of Monitoring Locations The annual environmental reporting for biological water quality (Q sampling) has been collected at eleven sampling locations, nine situated on the Derry River and two situated upstream and downstream of its confluence with the River Slaney. These are summarised on Table 2.1 and Figure 2.1 below and were also the locations used during the current 2019 reporting. Table 2.1 Location of Q sampling sampling sites on the Rivers Derry and Slaney (June 2019) Easting Northing Site no. Location (Irish Grid) (Irish Grid) 1 Derry River (Greenhall Bridge) 302132 170693 2 Derry River (Deegins Bridge) 301053 168969 Derry River (Shillelagh Bridge, 50m u/s WWTP outfall 3 299101 168011 (not Kerry Foods) 4 Derry River (25m d/s Kerry Foods outfall) 299072 167640 5 Derry River (200m d/s Kerry Foods outfall) 299027 167408 Derry River (600m d/s Kerry Foods outfall) 6 298850 167116 Derry River (1km d/s Kerry Foods outfall) 7 298843 166766 8 Derry River (2.5km d/s Kerry Foods outfall) 298730 165651 9 Derry River (Balisland Bridge) For inspection purposes only. 297795 164487 Consent of copyright owner required for any other use. 10 Slaney River (Kilcarry Bridge) 289263 162465 11 Slaney River (New Bridge) 289902 159661 Aquatic Assessment of the Derry & Slaney Rivers 6 EPA Export 25-04-2020:06:18:44 Figure 2.1 Map of sampling areas on the Slaney & Derry Rivers relative to the Kerry Foods outfall location 2.2 EPA Q Sampling The aquatic Q-sampling of the Derry and Slaney River was undertaken following the standard EPA methodology. Macro-invertebrate samples were converted to Q-ratings as per Toner et al. (2005). All riverine samples were taken with a standard For inspection kick sampling purposes only.