Discharge Licence Applications – Further Information
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Discharge Licence applications – Further information. Discharge Licence D0279-01 Dromahaire Further information. 1 “At how many times dry weather flow will discharges occur from the stormwater overflow, located at the inlet pipe of the waste water treatment plant Answer; The existing plant is discharging at approx 3DWF from the stormwater overflow,located at the inlet pipe of the waste water treatment plant. The new plant is designed to treat 3DWF at all times with a further 3DWF being stored in a stormwater overflow tank for a period of two hours before being returned through the treatment system. In excess of 6 DWF the flow will storm through a 6mm screen to the river. 2. “Provide an update of any works carried out at or details of any funding provided for the Dromahaire WWTP under the Water Services Investment Programme – Leitrim Towns and Villages sewerage scheme Feasability study.” Answer; Dromahaire WWTP is part of the Leitrim Towns and Villages sewerage scheme Bundle No.1 which is currently under construction. This scheme will provide new and upgraded sewerage infrastructure in eleven Towns and Villages including Dromahaire. For inspection purposes only. Consent of copyright owner required for any other use. The networks improvement works have been completed in all towns and villages at a cost of €8.0 million. The eleven new treatment plants are being procured as a Design Build Operate contract at a cost of €10.5 million. These works commenced in January 2009 A new Waste Water Treatment Plant on a green field site is currently under construction at Dromahaire and is programmed for completion and commissioning in November 2010. The cost of the new treatment plant at Drumahaire is approximately € 1.26 million. This Plant will be operational by the end of 2010 and the existing plant will be decommissioned early in 2011. 3. “Provide information on the future projected loading on the WWTP when the plant becomes fully operational at 2,200 p.e. i.e. Population equivalent influent flow rates and discharge rates.” The basic design Parameters for the new Wastewater Treatment plant are as follows; Population Equivalent 2,200 EPA Export 26-07-2013:15:30:46 Dry Weather Flow (L/s) 5.7 Peak flow to treatment (L/s) 17.2 Minimum outfall capacity (L/s) 68.8 Average BOD.5 (kg/day) 132.0 Suspended Solids (kg/day) 165.0 Total Phosphorus (kg/day) 4.95 The design of the new plant allows for fluctuations in the average daily BOD, SS, Phosphorus and Nitrogen levels up to 125% of the specified influent daily loads on a continuous basis. The design of the new plant will be capable of achieving Final effluent Discharge Limit Standards up to 3 DWF or peak flow. The Final Effluent Discharge Limits for Dromahaire are BOD5 25 mg/l Total Suspended Solids 35 mg/l COD 125 mg/l MRP 2.0 mg/l P 4. “When the new plant is fully operational will SW3 and SW4 still be in use? Answer; The Storm water overflows SW3 and SW4 will no longer be in use when the new plant is fully operational.The existing Storm Water overflow (SW2) at the existing WWTP will be abandoned. The only storm water overflow will be at the new WWTP and all solids will be removed on a 6mm screen. 5 “Where it is considered that any of the substances listed in Annex X of the Water Framework Directive (2000/60/EC) or any of the relevant pollutants listed in Annex VIII of the Water Framework Directive (2000/60/EC) are being discharged from the waste water works or are seen to be present in the receiving water environment For inspectiondownstream purposes only. of a discharge from the works (as a Consent of copyright owner required for any other use. result of any monitoring programme) the applicant shall screen the discharge for the relevant substance. Answer; It is not considered by LCC that such substances listed in Annex VIII & II (formely Annex X) are being discharged at Dromahair WWTP or are present in the receiving waters.There is no Industrial Licence discharging to this plant and the table of Dangerous Substances results already submitted in the application is in compliance with the Dangerous Substances standards and therefore there is no screening required . However the EPA have a monitoring point 1.8km d/s of Dromahair Bridge(d/s of existing and proposed plants) of which any results recorded, we have requested a copy of same. Until we receive these results we cannot comment on same. EPA Export 26-07-2013:15:30:46 6 “Assess the likelihood of significant effects of the waste water discharges from the Dromahair agglomeration on the relevant European site(s) 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. Provide details of the results of this assessment within six weeks of this notice. If significant effects are likely then an appropriate assessment must be carried out and a report of this assessment forwarded to the Agency within six weeks of the date of this notice. Answer; Dromahair WWTP 1. “Is the development in a nature conservation site?” LCC Response Yes The receiving water for Dromahair WWTP is the River Bonet. The River Bonet is part of the Lough Gill SAC . ASSESS IMPACTS Dromahair Wastewater Treatment Plant “Assess Impacts” is required as per Circular L8/08 For inspection purposes only. Consent of copyright owner required for any other use. Status of existing wastewater treatment plant The original WWTP at Dromahair was commissioned in 1977 and designed to cater for a population equivalent (PE) of 500. In 2004 a package plant was installed which added a further 600PE to the original plant bringing the total PE to 1100. The plant is currently receiving wastewater with a strength equivalent to 901PE. The treated wastewater discharges to the Bonet River and enters Lough Gill. Nature conservation sites located within 5km of Dromahair WWTP A search on the National Parks and Wildlife Service Map viewer web site found that 10km G73 and G83 encompassing the Lough Gill catchment found that the Owenmore, Bonet and Shanvaus Rivers were Special Area’s of Conservation (SAC) and that Lough Gill was an SAC and a proposed Natural Heritage Area (NHA). According to the National Parks and Wildlife Service synopsis of Lough Gill (Site Code: 001976) this site comprises Lough Gill with Doon Lough to the north-east, the Bonet River as far as but not including Glenade Lough, and a stretch of the Owenmore River near Manorhamilton in Co. Leitrim. Lough Gill itself, 2 km east of Sligo town, lies at a geological junction of ancient metamorphic rocks which produce acid groundwater and limestone which dissolves in the groundwater. The large 8 km long lake has steep limestone shores and underwater cliffs and is over 20m deep in places. The lake appears to be naturally eutrophic, and thus represents a habitat listed on Annex I of the EU Habitats Directive. The site is a candidate SAC selected for EPA Export 26-07-2013:15:30:46 alluvial wet woodlands a priority habitat on Annex I of the E.U. Habitats Directive. The site is also selected as a candidate SAC for old Oak woodlands and natural eutrophic lakes, both habitats listed on Annex I of the E.U. Habitats Directive. The Bonet River is an important Salmon River. Habitats and Species that are Site Water Dependent on the Bonet River A search on the National Parks and Wildlife Service Map viewer web site found that 10km G73 and G83 grids identified Small-White Orchid (Pseudorchis albida) at Lough Gill in 1899, at Lough Anelteen in 1989 and 1991, at Carns Hill in 1989, at Ballynamona in 1991 and at Ballure in 1991, Fallow deer (Dama dama) at Ballintogher West on 06/10/1991, Fallow deer (Dama dama) at Dromahair on 12/02/1992, Otter (Lutra lutra) at Dromahair on 12/02/1992, small-white orchid (Pseudorchis albida) at O’Rourke’s Table in 1934, at Curraghan in 1991, at Moreragh in 1993, at Curraghan in 1993 and at Banagher in 1994. According to the National Parks and Wildlife Service synopsis of Lough Gill (Site Code: 001976) this site is selected for the following species listed on Annex II of the same directive - Sea Lamprey, River Lamprey, Brook Lamprey, Whiteclawed Crayfish, Atlantic Salmon and Otter. The aquatic macrophyte flora is very limited, probably due to the rapid increase in depth around most of the margin. Species such as pondweeds (Potamogeton spp.) are present, as well as Shoreweed (Littorella uniflora). Where the lake shore has a shallow gradient, some swamp vegetation occurs, mainly dominated by Common Reed (Phragmites australis), with Common Club-rush (Scirpus lacustris) and sedges (Carex spp.). The site contains Old Oak Woodlands, a habitat listed on Annex I of the EU Habitats Directive. These woods are dominated by Oak (Quercus spp.), Rowan (Sorbus aucuparia) and Willows (Salix spp.). Strawberry Tree (Arbutus unedo), in its most northerly site in the world, Yew (Taxus baccata), in abundance, Bird Cherry (Prunus padus), a Red Data Book species, and the nationally scarce Rock Whitebeam (Sorbus rupicola) can also be found here. Some areas of conifer plantation occur in association with these woodlands. The site is also notable for the presence of Alluvial Forest, a priority habitat liste d on For Annex inspection purposesI of theonly.