Annual Environmental Report 2014 Agglomeration Name: Ringsend Licence Register No. D0034-01 Preface This 2014 Annual Environmental Report is made up of 5 parts dealing specifically with each functional area within the Ringsend agglomeration and a final part containing the Certification and Sign-Off: Part 1 – Dublin City Functional Area Part 2 – South Dublin County Council Part 3 – Fingal County Functional Area Part 4 – Dun Laoghaire Rathdown County Functional Area Part 5 – Meath County Functional Area (to follow) Part 6 - Certification and Sign Off PART 1 Dublin City Council Functional Area Annual Environmental Report 2014 Agglomeration Name: Ringsend Licence Register No. D0034-01 PART 1 Dublin City Council Functional Area Part 1 Dublin City Council Functional Area Table of Contents Section 1. Executive Summary and Introduction to the 2014 AER 1 1.1 Summary report on 2014 1 Section 2. Monitoring Reports Summary 2 2.1 Summary report on monthly influent monitoring 2 2.2 Discharges from the agglomeration 3 2.3 Ambient monitoring summary 5 2.4 Data collection and reporting requirements under the UWWT Directive 11 2.5 Pollutant Release and Transfer Register (PRTR) - report for previous year 11 Section 3. Operational Reports Summary 12 3.1 Treatment Efficiency Report 12 3.2 Treatment Capacity Report 12 3.3 Extent of Agglomeration Summary Report 13 3.4 Complaints Summary 13 3.5 Reported Incidents Summary 14 3.6 Sludge / Other inputs to the WWTP 17 Section 4. Infrastructural Assessments and Programme of Improvements 18 4.1 Storm water overflow identification and inspection report 18 4.2 Report on the improvement programme requirements 29 Section 5. Licence Specific Reports 34 5.1 Priority Substances Assessment 36 5.2 Drinking Water Abstraction Point Risk Assessment 36 5.3 Shellfish Impact Assessemnt Report 36 5.4 Toxicity/Leachate Management 40 5.5 Toxicity of the Final Effluent 40 5.6 Pearl Mussel Measures Report 41 5.7 Habitats Impact Assessment Report 41 Section 6. Appendix 39 i | Irish Water Part 1 Dublin City Council Functional Area Section 1 Executive Summary and Introduction to the 2014 AER 1.1 Summary report on 2014 This Annual Environmental Report has been prepared for D0034-01, Ringsend Agglomeration, in County Dublin in accordance with the requirements of the wastewater discharge licence for the agglomeration. Specified assessments are included as an appendix to the AER as follows: • Priority Substances Assessment (Appendix 6.6) • Toxicity / Leachate Management Report (Appendix 6.7) • Final Effluent Toxicity Assessment (Appendix 6.8) The agglomeration is served by a wastewater treatment plant with a mean Design PE of 1.64 million. The treatment process includes the following:- • preliminary treatment (including screening / grit removal), FOG removal • primary treatment • sludge treatment • secondary treatment - SBR • tertiary treatment – UV treatment during the bathing season. The final effluent from the Primary Discharge Point was compliant with the following Emission Limit Values in 2014 –pH, Toxicity and E.Coli (during the Bathing Season). The following parameters exceeded the emission limit values in 2014:- • COD • cBOD • Suspended solids • Total nitrogen • Total phosphorus 15,779 tonnes sludge (as tonnes dry solids) were removed from the wastewater treatment plant in 2014. 14,236 tonnes were removed as Biofert and 1,543 tonnes as Biocake (dewatered sludge cake) (Source: CAW). Sludge was transferred to Quinn’s, Baltinglass, Co. Wicklow. There were no major capital or operational changes undertaken in 2014. An Annual Statement of Measures 2015 is included in Appendix 6.1. 1 | Irish Water Part 1 Dublin City Council Functional Area Section 2 Monitoring Reports Summary 2.1 Summary report on monthly influent monitoring Table 2.1 - Influent Monitoring Summary TN Hydraulic Organic BOD COD SS TP (mg/l Loading Loading (mg/l) (mg/l) (mg/l) (mg/l P) N) (m3/d) (PE/day) Number of 145 248 248 101 101 Samples Annual Max. 510 1,203 686 9.73 56.2 1,439,445 4,041,555 (Daily) Max Weekly Average 3,098,410 (UWW) Annual 232* 525 247 5.32 34.09 460,788 1,777,994* Mean * Annual Mean 253 1,830,924 (UWW) *Derived from IW Flow Weighted Average Organic Load Calculation Instructions for 2014 Significance of results The annual mean hydraulic loading is less than the Treatment Plant Capacity as detailed further in Section 3.2. The annual maximum organic loading is greater than the Treatment Plant Capacity as detailed further in Section 3.2. 2 | Irish Water Part 1 Dublin City Council Functional Area 2.2 Discharges from the agglomeration Table 2.2 - Effluent Monitoring Summary (SW1 Dublin) Table 2.2 - Effluent Monitoring Summary (SW1 Dublin) BOD COD TSS Total P Total N pH Toxicity Comment (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (TU) WWDL ELV (Schedule A) 25 125 35 1 10 6-9 5 24-Hour Composite Samples ELV with Condition 2 50 250 88 1.2 12.0 - - Interpretation included Number of sample results 145 248 248 101 101 365* 1 *On-line 248 Number of sample results 14** 11** 56** 101 86 0 0 **failures attributed to storm above WWDL ELV [16] [12] [58] conditions alerted by Met Eireann are outlined below Number of sample results 7 3 11 101 68 - N/A above ELV with Condition 2 Interpretation included Annual Mean (for 17 73 31 3.44 14.83 N/A N/A parameters where a mean ELV applies) Max. No. of ELV 12 18 18 9 9 18 Exceedances (B.3) Overall Compliance Fail Fail Fail Fail*** Fail Pass Pass ***No Total P Removal on-site (Pass/Fail) Significance of results The WWTP was compliant with the ELV’s set in the wastewater discharge licence for pH and Toxicity. Non-compliances for COD/TSS in a sample taken on 04/02/14 (834003), for BOD in a sample taken on 13/02/14 (837104), for TSS in a sample taken on 05/10/14 (921664) and for BOD and TSS in a sample taken on 13/11/14 were due to storm conditions alerted by Met Eireann (orange/red wind conditions and orange rainfall conditions) on these dates. The impact on receiving waters is assessed further in Section 2.3. 3 | Irish Water Part 1 Dublin City Council Functional Area Table 2.2 continued - Effluent Monitoring Summary DIN Ammonia Ortho- OFG E.Coli *** Enterococci*** Colour Comment (mg/l N) (mg/l N) Phosphate (mg/l) (MPN/100 ml) (CFU/100 ml) Visual (mg/l P) Inspection **** WWDL ELV (Schedule A) - - - - 100,000 - - 24-Hour Composite Samples ELV with Condition 2 - - - - 150,000 - - ***15/05/14 to 18/09/14 Interpretation included E.Coli and Enterococci reported for discrete post UV samples taken Number of sample results 245 245 245 102 69 50 246 **** Hazen Units- Laboratory Test Number of sample results - - - - 1 - - above WWDL ELV (25/08/14) Number of sample results - - - - 0 - - above ELV with Condition 2 Interpretation included Annual Mean (for 12.56 8.95 2.45 5.09 N/A N/A 47 parameters where a mean ELV applies) Overall Compliance - - - - Pass - - (Pass/Fail) The WWTP was compliant with the ELV set for E.Coli (during the Bathing Season) in the wastewater discharge licence. There was 1 sample non-compliant with the ELV (25/08/14). The impact on receiving waters is assessed further in Section 2.3. 4 | Irish Water Part 1 Dublin City Council Functional Area 2.3 Ambient monitoring summary Table 2.3 - Ambient Monitoring Report Summary EPA Current EQS Does assessment of the Feature Status ambient monitoring Ambient Monitoring Point from Irish Grid Coding results indicate that the WWDL (or as agreed with EPA) Reference Tool discharge is impacting on code water quality? Upstream monitoring points; Lower Liffey, Chapelizod Bridge Many Moderate No Mixing Zone monitoring points; Liffey Estuary Upper Many Moderate Liffey Estuary Lower Good Yes (See Summary Tolka Estuary Moderate below) Downstream monitoring points; Dublin Bay Many Good No The results for the upstream, mixing zone and downstream monitoring are included in Appendix 6.2. Significance of results The WWTP was compliant and non-compliant with the ELV’s set in the wastewater discharge licence as detailed in Section 2.2. The discharge from the wastewater treatment plant does not have an observable negative impact on the water quality in the River Liffey upstream of the Islandbridge Weir. The EPA Ecological Status was reported as Moderate for the 2010-2012 period. The discharge from the wastewater treatment plant has a negative impact on the receiving water quality within the near field of SW1. The EPA Ecological Status in the Liffey Estuary Upper and Lower was reported as Moderate and Good respectively for the 2010-2012 period. The EPA Ecological Status in the Tolka Estuary was reported as Moderate for the 2010-2012 period. The discharge from the wastewater treatment plant has no observable impact on the receiving coastal water quality in Dublin Bay. The EPA Ecological Status in Dublin Bay was reported as Good for the 2010- 2012 period. 5 | Irish Water Part 1 Dublin City Council Functional Area Summary of Results Licence D0034-01 requires monitoring and assessment of the impacts of the Ringsend effluent discharge on receiving water quality at agreed sampling locations as follows: 1. 9 Ambient Surface Waters (ASW2 – ASW10) covering sampling points in the lower Liffey Estuary in the near field of the discharge (ASW2 to ASW5), and points on the River Liffey and River Tolka (ASW6 to ASW10) 2. 11 additional monitoring points on the Liffey and Tolka Estuaries (Surface and Depth) 3. 9 monitoring locations in Dublin Bay (Surface and Depth) 4. 8 shoreline locations, 3 of which are EC designated bathing waters (Dollymount Bathing Zone, Sandymount and Merrion Strands).