ATTACHMENT E.2 EMISSIONS TO SURFACE WATERS SITE SERVICES LAYOUT SHEET 1 OF 2 (IE DR-0021)

Transcription

1 ATTACHMENT E.2 EMISSIONS TO SURFACE WATERS SITE SERVICES LAYOUT SHEET 1 OF 2 (IE DR-0021) SITE SERVICES LAYOUT SHEET 2 OF 2 (IE DR-0022) LOCATION OF EMISSION TO SURFACE WATER (IE DR- 0002) Page 146 of 217

2 Attachment E.2 Emissions to Surface Waters Uncontaminated stormwater from the facility will be discharged to the IDA s stormwater drain located at the road to the east of the site (access road to the IDA Belview Science and Technology Park). Detail of the surface water emission point is outlined in Table E.2(i) and Table E.2(ii) of this application. Contaminated or non-compliant Stormwater will be sent to the Waterford City Council WWTP at Belview for treatment or to the site firewater collection pond for interim storage pending a decision on fate, as appropriate. Process trade effluent (mainly from CIP processes) and effluent will be discharged to the trade effluent sewer and treated at the Waterford City Council WWTP at Belview. Condensate from the evaporation plant will be treated onsite by reverse osmosis and may be either re-used onsite for a variety of uses or sent for treatment at the WCC WWTP along with the process effluent. See Drawings IE DR-0021 and IE DR-0022 for a site plan showing the site services layout (existing and proposed). The location of the surface water emission point is shown on Drawing No. IE DR-0002 also included in this section of the IPPC licence application. As the discharge will be of water normally entering the hydrological system at the site environs, without any contamination arising due to site activities, there will be no impact on the quality or volume of the receiving stream as a result. Proposed Stormwater Collection System There will be a single surface water discharge point from the facility, to the existing 450mm IDA storm drain at the access road east of the site. Stormwater from road and parking areas on site will be collected and passed through an oil/petrol interceptor and then combined with stormwater from other areas on site (mainly roofed areas). This will pass through a chamber where it will be monitored for ph, temperature and Total Organic Carbon content (TOC). Should the stormwater be outside of the parameters for discharge licensed by the EPA in the facility s IPPC licence, it will be automatically diverted to the firewater retention pond (see below) for interim storage and investigation prior to onward discharge / disposal. Should the storm water comply with the discharge conditions of the IPPC licence, it will be discharged to the IDA storm drain at a rate of 37.5 L/s. A hydrobrake system will be provided in the drain to divert flow greater than this to the stormwater attenuation pond. A 2,000 m 3 stormwater attenuation pond will be provided to attenuate large volumes of rainfall during a storm event so that the stream and other areas around do not flood. The stormwater attenuation pond will be lined in order to ensure that the pond does not interfere with the groundwater in the area. There will be no direct discharge of surface water from the facility directly to the artificial wetland and lagoon area at the northeast of the site. Page 147 of 217

3 The existing drainage ditches around the site footprint will be replaced by land drains to take any overland flow of surface water and prevent flooding of the site itself from overground flows from upgradient lands to the west and northwest. These drains will discharge into the lagoons and onward to the stream. Some of the roadways at the rear of the site (north/western end) which will only have occasional traffic may be constructed of grasscrete, a material that allows percolation of rainwater back into the soil. In the event that discharge from the stormwater attenuation pond is outside of the licensed parameters for discharge, the valve will close automatically. The non-compliant stormwater may be sent to the Waterford City Council WWTP at Belview for treatment or to the site firewater collection pond for interim storage pending a decision on fate, as appropriate. There will be no substances listed in the Schedule of EPA (Licensing)(Amendment) Regulations 2004 S.I. No. 394 of 2004 held or used at the facility, so there will be no emissions thereof to surface water. There will be no substances listed in List I and List II substances listed in the Annex to EU Directive 2006/11/EC (as amended), held or used at the facility, so there will be no emissions thereof to surface water. There will be no substances listed in the European Communities Environmental Objectives (Surface Waters) Regulations held or used at the facility, so there will be no emissions thereof to surface water. Emission levels for discharges to surface water The EPA s BAT Guidance Note on Best Available Techniques for the Dairy Processing Sector (2008), Section 6.2, sets out emission level values that are achievable for wastewater treatment. Those emission levels apply to effluent prior to dilution by uncontaminated streams, e.g. storm water, cooling water, etc, and are not intended as emission limits for discharges of uncontaminated stormwater. Section 7.2 of the BAT Guidance Note proposes the following monitoring of aqueous emissions: Daily monitoring of flow, volume, ph, temperature and any other relevant parameters deemed necessary by the Agency, taking account of the nature, magnitude and variability of the emissions and the reliability of the control technique. It is proposed that the following be conducted on the discharge to the IDA stormwater drain from the stormwater attenuation pond: Parameter ph Flow Temperature TOC Frequency of monitoring Continuous Continuous Continuous Continuous Note that at the time of this application, the EPA was in the process of inviting consultation on guidance for the setting of trigger values for discharges to surface water, which recommended that 12 months of continuous monitoring be collected after Page 148 of 217

4 commencement of operation of a licensed activity, to enable realistic trigger values to be set for the individual site. A summary report of emissions to surface water shall be submitted to the EPA each year as part of the Annual Environmental Report (AER) for the facility. The information contained in the AER shall be prepared in accordance with any relevant guidelines issued by the EPA. Proposed Effluent Collection System There will be no discharges of treated or untreated effluent to surface water arising at the facility. Trade effluent will be collected in a balancing tank and neutralised prior to discharge to the sewer, which will carry it for treatment at the Waterford City Council WWTP at Belview. Foul effluent will similarly be sent for treatment by sewer at the Waterford City Council WWTP at Belview. Water Quality in the Downstream Surface Water Courses Stream Uncontaminated stormwater from the site will be discharged in a controlled fashion to the IDA stormwater drain at location SW1. In 2007, Scott Cawley Ltd. performed biological water quality sampling (Q-sampling) in the stream. The results indicated that the stream had a Q-rating of 3-4 and 3, i.e. slightly to moderately polluted in terms of its biological water quality. In 2009, AWN conducted a hydraulic capacity assessment of the stream east of the site as part of the Environmental Impact Assessment for the Supram facility (planning ref. KK PR/09/194). For that proposed site, using the rainfall data for Waterford city from Met Eireann, the receiving stream has sufficient hydraulic capacity to cater for the stormwater discharge from the proposed Supram development, during a 1 in 100 year flood over a 1 hour period, even considering the possible impacts from climate change. River Suir The Lower River Suir, which is located approximately 330m south of the site, covers a stretch of 6.5 Km of the Suir Estuary, that extends from Ballynakill on the outskirts of Waterford city, to Cheekpoint, where the Suir meets the River Barrow. The Lower Suir Estuary is considered a transitional water body, i.e. a surface water body in the vicinity of a river mouth, which is partly saline in character as a result of its vicinity to coastal waters, but which is substantially influenced by freshwater flows. The Lower Suir Estuary is not a Water Framework Directive (WFD) protected area. Approximately 1.7Km downstream of the confluence of the stream and the Suir estuary is a New Shellfish Area at the meeting of the River Suir and the River Barrow. The section of the Lower Suir Estuary from Little Island to Cheekpoint has Good WFD status. The EPA s online maps show the estuarine water quality of the Lower Suir Estuary to be Intermediate ( ). Page 149 of 217

5 The subject site falls within the catchment areas of both the Barrow and the Suir rivers, which are salmonid water bodies. The surface water environment surrounding the site is considered ecologically sensitive as: The Lower River Suir is a designated proposed NHA and candidate SAC (site code 2137) The River Barrow/River Nore is a candidate SAC The River Barrow estuary is a proposed NHA; and King s Channel is a proposed NHA (site code ). In 2009, AWN conducted a baseline water quality survey at the streams located east and west of the site as part of the Environmental Impact Assessment for the Supram facility (planning ref. KK PR/09/194). Water samples were collected by AWN from both streams and analysed for a range of parameters. This was collated with Q-sampling also conducted by the ecologists, Scott Cawley Ltd., in 2007, and desktop data taken from the South Eastern River Basin District (SEBRD) reports and from Waterford City Council (2007). AWN concluded that the River Suir and River Barrow in the vicinity of the Supram site were at risk of not achieving good status by 2015, according to the SEBRD. The Barrow, Nore, Suir Estuary was possibly at risk of not achieving good status by This was due to the presence of elevated levels of contaminants, presumably due to untreated effluent outfalls into the rivers. Since the time of AWN s study, the Waterford city WWTP at Belview has come online. This has the capacity to treat 190,000 p.e., of which 60% is reserved for industrial use. It is assumed that the operation of the WWTP will have led to a significant improvement in water quality in the Suir and downstream. Flood Risk The site is not in a flood risk area. According to the OPW flood maps, no flood events have been recorded at the subject site or in the immediate surrounding area: the nearest flood locations is the northern bank of the Suir, located ca. 300m south of the subject site. Kilkenny County Council does not have any records of flooding in the vicinity of the site. Waterford City Council records show the highest recorded flood level at Rice Bridge to be 2.87 m O.D. (Malin). The lowest point of the site is 15.5 m O.D.(Malin). The bank of the River Suir, which is located south of the site, is 1.45 to 1.62 m O.D. (Malin). The subject site, situated approximately 13 m higher than the banks of the River Suir, thus has a very low risk of flooding. The Ferrybank-Belview Local Area Plan (March 2009, Section ) states that there are no flooding problems in the area except in the Newrath area adjacent to the River Suir, which suffers from tidal flooding on the local road. AWN conducted a desktop hydraulic capacity assessment in February 2009 of the receiving stream (to the east of the subject site) for surface water runoff from the Supram development (planning ref. KK 09/194). It concluded that the receiving stream has Page 150 of 217

6 sufficient hydraulic capacity to cater for the surface water discharge from the proposed Supram development, during a 1 in 100 year flood over a 1 hour period, even taking climate change effects into account. The LAP seeks to protect all stream and river corridors from development, with opportunities for storm water attenuation ponds in the proposed areas of open space, so as to ensure the water quality of rivers and streams is maintained. The stormwater attenuation pond (capacity 2,200m 3 ) is sized to take the runoff from the roofed and hardstanding areas of the site during a 1 in 100 storm event. The receiving IDA pipe is of 450mm dia. at 1:447 gradient with a capacity of 150 L/s. A hydrobrake system will be installed to ensure that excessive runoff from the site during a storm event is contained in the stormwater attenuation pond to minimise the possibility of flooding the stream and downstream lands. The collected stormwater will be released in a controlled fashion to the stream post-storm event. Page 151 of 217

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