Sligo County Council Comhairle Chontae Shligigh
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Sligo County Council Comhairle Chontae Shligigh 2013 Annual Environmental Report FOR COLLOONEY WASTEWATER TREATMENT WORKS WWDL NO: D0093-01 Sligo Water Services Section St. Anne’s Place, Old Gaol, Sligo. SLIGO COUNTY COUNCIL COLLOONEY WASTE WATER TREATMENT PLANT D0093-01 THIRD ANNUAL ENVIRONMENTAL REPORT Sligo County Council Water Services Old Gaol St. Anne’s Place Sligo February 2014 COLLOONEY AGGLOMERATION Revision Description Prepared By Reviewed by Approved by Issue Date A Draft K. Love N. Haran 1st March B C D TABLE OF CONTENTS 1.0 Introduction 1.1 Collooney Wastewater Treatment Plant 1.2 Annual Environmental Report 1.3 2013 Summary 2.0 Summary of Monitoring Reports 2.1 Summary Report on Monthly Influent Monitoring 2.1.1 Discussion of Influent Monitoring Results 2.2 Discharges from the Agglomeration 2.2.1 Discussion of Effluent Monitoring Results 2.3 Treatment Efficiency Report 2.4 Treatment Capacity Report 2.5 Ambient Monitoring Summary 2.5.1 Discussion of Ambient Monitoring Results 2.6 Data Collection & Reporting Requirements under the UWT Directive 2.7 Pollutant Release & Transfer Register (PRTR) – report for previous year 2.8 Extent of Agglomeration Summary Report 3.0 Compliant & Incident Reports 3.1 Complaints Summary 3.2 Reported Incidents Summary 4.0 Infrastructural Assessments & Programme of Improvements 4.1 Storm Water Overflow Identification & Inspection 4.2 Report on Programme of Improvements 4.2.1(a) Hydraulic Risk Assessment 4.2.1(b) Environmental Risk Assessment 4.2.1(c) Structural Risk Assessment 4.2.1(d) O&M Risk Assessment 5.0 Environmental Liability & Financial Provisions 5.1 Statement of Measures 5.1.1 Introduction 5.1.2 Background 5.1.3 Environmental Sensitivity 5.1.4 Sensitivity of Receiving Waters 5.1.5 Protected Ecological sites & Species 5.1.6 Human Health 5.2 Environmental Liabilities Risk Assessment 5.2.1 Environmental Sensitivity Assessment 5.2.2 Risk Assessment 5.2.3 Financial Provisions 6.0 License Specific Reports 6.1 Priority Substance Assessment 6.2 Drinking Water Abstraction Point Risk Assessment 6.3 Shellfish Impact Assessment Report 6.4 Toxicity/Leachate Management 6.5 Toxicity of the Final Effluent Report 6.6 Pearl Mussel Measures Report 6.7 Habitats Impact Assessment Report 7.0 Certification & Sign Off List of Tables Table 1 Influent Monitoring Summary Table 2 Effluent Monitoring Summary Table 3 Removal Efficiencies Table 4 Treatment Capacity Report Summary Table 5(a) Up-Stream Ambient Monitoring Summary Table 5(b) Down-Stream Ambient Monitoring Summary Table 6 Ambient Monitoring Summary Table 7 Complaints Summary Table 8 Incidents Summary Table 9(a) SWO Identification & Inspection Summary Table 9(b) SWO Identification & Inspection Summary Report Table 10 Improvement Programme Summary Report Table 11 Improvement Programme WWTP Summary Table 12 Sewer Integrity Risk Assessment Improvement Programme Table 13 Water Body Classifications Table 14 Biological Quality Rating Table 15 License Specific Report Summary Table 16 Check List List of Appendices Appendix i Influent Monitoring Results Appendix ii Effluent Monitoring Results Appendix iii Ambient Monitoring Results Appendix iv Agglomeration Layout Appendix v Reported Incidents Appendix vi SWO Inspection Report Assessment Criteria Section I Introduction 1.0 INTRODUCTION 1.1 Collooney Wastewater Treatment Plant. The WWTP serving Collooney is located on Union Road, adjacent to the N4, it is an extended aeration plant which was designed to cater for a population equivalent of 1,400. The older parts of Collooney are served by a combined system with newer areas of the town being served by a separate surface water drainage system. Pump stations at Knockbeg, Riverwalk, Highwood Park & Radharc Na hAbhainn pumps into the system. The existing WWTP consists of Inlet Works Aeration Tank 2No. Sludge Beds Final Clarifier There is also a storm water overflow facility from the treatment works, located at the inlet to the plant. In periods where there are large stormwater flows, flows above the design capacity of the plant overflows by weir to the Owenmore River. Final Effluent Discharge from the treatment plant is to the Owenmore River (TPEFF2700D0093SW001) which runs adjacent to the treatment works via a 300mm discharge pipe ending in a flap valve. 1.2 Annual Environmental Report This Annual Environmental Report (AER) has been prepared in accordance with the requirements of Condition 6.10 of the EPA Wastewater Discharge License No. D0093-01 issued on the 9th March 2011 for the Collooney Agglomeration & Schedule D of the said license reproduced below. Annual Environmental Report Content Note 1 Discharges from the agglomeration. Summary report on monthly influent monitoring. Data collection and reporting requirements under the Urban Waste Water Treatment Directive. Complaints Summary. Pollutant Release and Transfer Register – report for previous year. Pollutant Release and Transfer Register – proposal for current year. Ambient monitoring summary Storm water overflows identification and inspection report. Reported incidents summary Report on progress made and proposals being developed to meet the improvement programme requirements. Note 2 Development/Infrastructural work summary (completed in previous year or prepared for current year). Any other items specified by the Agency. Note 1: Content may be revised subject to the agreement of the Agency. Note2: This summary report shall provide detail on all measures proposed and undertaken by the Water Services Investment Programme for the agglomeration, including progress reports on infrastructural works and a statement of compliance with timeframes set out in this license. This is the third AER to be submitted under the Collooney License issued 9th March, 2011. 1.3 2013 Summary This AER was carried out in accordance with the EPA document “Guidance on the Preparation & Submission of the Annual Environmental Report for Waste Water Discharge Licenses for 2012” revision no.1, issue no.3 and in compliance with Condition 6 and Schedule D of the WWDL which sets out the contents required of the AER. Monitoring Reports There was Seven (7) number compliance issues relating to this license for the 2013 reporting year, these related to 7no Ammonia, 1no T.S.S, 2 No. Orthophosphate ELV and 1 No. Suspended Solids exceedances (a record of which can be found in Section 3.2 Reported Incidents Summary Operational Reports There were no complaints relation to the agglomeration in 2013 and all reportable incidents were made to the EPA via the online EDEN system as and when the incident was noticed. Infrastructure Assessment & Programme of Improvements The SWO’s were inspected & assessed by Sligo County Council in January 2013 to determine compliance with the requirements of DoEHLG Document ‘Procedures and Criteria in relation to Storm Water Overflows, 1995’. Details of the inspection completed are included in Appendix 6, as per Part 4 The Sewer Integrity Assessment Toolset (Appendix vii) was completed and a risk assessment score of “Low Risk” was achieved. In order to further reduce this risk assessment scores the items within Section 4.2.1 will need to be addressed. The implementation of any outcomes from these assessments will be dependant Departmental funding and approval. Environmental Liabilities & Financial Provisions The Owenmore River was assigned a biological quality rating of Q3 (Moderately polluted) at the upstream monitoring station and Q4 at the downstream monitoring station in 2009. The Owenmore River is classified as at risk of not achieving good status. The water body must maintain 'Good' status in order to comply with the Water Framework Directive (WFD). It is considered that management procedures already in place are adequate to maintain the discharge at a quality that complies with the license conditions and does not significantly impact on the sensitive environmental receptors. The plant caretaker/technician have implemented procedures which are continually reviewed to manage the identified risks at their current levels and to reduce them further in as far as is reasonable possible License Specific Reports Based on the ‘Guidance on the Screening for Priority Substances for Waster Water Discharge License’, it can be concluded that when the analysis was compiled by City Analysts Limited in 2011 on behalf of Sligo County Council there were no elevated levels or exceedances of the Priority Substances as outlined in the European Communities Environmental Objectives (Surface Waters) (Amendment) Regulations 2012 Section II Summary of Monitoring Reports 2.0 Summary of Monitoring Reports 2.1 Summary Report on Monthly Influent Monitoring. Condition 4.15 of the WWDL states “The licensee shall carry out monthly monitoring of the influent stream to the waste water treatment plant for cBOD, COD, Suspended Solids, Total Nitrogen and Total Phosphorus in order to measure the mass loadings and removal efficiencies within the treatment plant. Appendix 1 shows all Influent Monitoring Results for the year, together with all available daily flows. 2.1.1 Discussion of Influent Monitoring Results Table 1 shows an average Influent flow of 347m3/day (4l/sec) over the year and an average influent BOD of 326mg/L, this equates to a BOD load of 113 Kg/day and a population equivalent of 815 (@ 60g BOD/hd/day). The below Table outlines the average, minimum & maximum results for the year, 2013 Table 1: Influent Monitoring Summary BOD COD T.S.S Total Total Inlet Hydraulic Organic mg/L mg/L mgL N as P as Flow Loading Loading N P m3/day PE/day mg/L mg/L No. of 12 12 12 12 12 Samples Average 326.8 584 136 38.9 5.66 347 1542 1885 Minimum 141 274 39 8.42 .645 12 Maximu 948 1185 454 77 11.2 1162 m 2.2 Discharges from the Agglomeration Condition 4.1 of the License states “The licensee shall carry out such sampling, analyses, measurements, examinations, maintenance and calibrations as set out below and in accordance with Schedule B :Monitoring, of this licence. There are three (3) discharges from the agglomeration, the Primary Discharge Point (TPEFF2700D0094SW001) & two (2) storm water overflows (SW2 & SW3).