LETTERKENNY AER 2013

Licence Register No. D0009-01

Table of Contents Contents

1.0 Executive Summary and Introduction to the 2013 AER 3 1.1 Summary Report on 2013 2.0 Monitoring Reports Summary 5 2.1 Summary Report on Monthly Influent Monitoring 5 2.2 Discharges from the Agglomeration 5 2.3 Ambient Monitoring Summary 6 2.4 Data collection and Reporting Requirements under the Waste Water Treatment Directive 7 2.5 Pollutant Release and Transfer Register (PRTR) Report for the Previous Year 7

3.0 Operational Reports Summary 7 3.1 Treatment Efficiency Report 7 3.2 Treatment Capacity Report 7 3.3 Extent of Agglomeration Summary Report 8 3.4 Complaints Summary 8 3.5 Reported Incidents Summary 8 3.6 Sludge/ Other Inputs to the WWTP 8

4.0 Infrastructural Assessments and Programme of Improvements 9 4.1 Storm Water Overflow Identification and Inspection Report 9 4.2 Report on Progress Made and Proposals being Developed to meet the Improvement Programme Requirements 10

5.0 License Specific Reports 11 5.1 Priority Substances Report 11 5.2 Drinking Water Abstraction Point Risk Assessment 11 5.3 Shellfish Impact Assessment Report 11 5.4 Toxicity/Leachate Management 11 5.5 Toxicity of Final Effluent Report 11 5.6 Pearl Mussel Measures Report 12 5.7 Habitats Impact Assessment Report 12

6.0 Certification and Sign Off 13

7.0 Appendices 15 Appendix 1 Schematics of Wastewater Treatment Plant & Sludge Treatment Centre 15 Appendix 2 Influent Monitoring Results 17 Appendix 3 Effluent Monitoring Analysis with Schedule A Emission Limit Values 18 Appendix 4 Ambient Monitoring Results 19 Appendix 5 PE Calculation/Analysis 20 Appendix 6 Efficiency Analysis 21 Appendix 7 Pollutant Release Transfer Register (PRTR) 22 Appendix 8 Unsewered Area Within Letterkenny Agglomeration 28 Appendix 9 Urban Waste Water Treatment Plant Returns 2013 29

2 1.0 Executive Summary and Introduction to the 2013 AER

1.1 Summary Report on 2013

Letterkenny Wastewater Treatment Plant and Sludge Treatment Centre were officially opened on the 8 th November 2013. Construction works commenced on the new treatment plant and sludge centre in May 2011 with County Council handing over the daily operation and maintenance of the old treatment plant to the contractor engaged to carry out the work, Severn Trent Water/Response Engineering in June 2011. While the Design & Build element of the contract was scheduled to be completed by March 2013, the new treatment works came into operation in October 2012 with the emission limit values for the various parameters set out in Schedule A of the Wastewater Discharge Licence being complied with fully since then. Under the Design, Build, Operate contract, Severn Trent Response will operate and maintain the wastewater and sludge treatment plants for a 20 year period.

The agglomeration of Letterkenny comprises of a combined collection system, much of it in existence since the 1950s and 1960s. Many of the more recent areas of residential development are served by partially separated collection systems. Significant improvements were carried out on the sewer network during 2004 and 2005, including the installation of new trunk pipeline, the construction of a number of sewage pumping stations and the decommissioning of two major storm water overflows. Further upgrade works to improve the network and address the discharges to be discontinued listed in Schedule A.3 of the licence are at detailed design stage. Some outline data on the new Letterkenny Wastewater Treatment Plant and Sludge Treatment Centre is listed below while a schematic of the plant included in Appendix 1.

Stormwater Site

• Storm Overflow system allows max 300l/s flow for treatment ; • Excess storm flows to storm holding tank cap. 3,450 m3; • Stored wastewater is pumped back for full treatment later; • Allows discharge to River Swilly in exceptional circumstances if the tank is full and the storm continues.

Wastewater Treatment Works

• Stage 1 design capacity 40,000 population equivalent, 312 l/s: Provision to double the capacity in stage 2; • Treatment units include • Inlet works : screening, grit & grease removal; • Biological treatment: twin aeration chambers including P- removal; • Clarifiers: settlement & remove scum & sludge; • UV disinfection; • Odour treatment

3 Sludge Treatment Centre

• Design capacity to treat 2,500 tonnes of dry solids annually. • Sludge is dried to 90% dry solid pellets and used as fertiliser on land • Facilities include • Reception of leachate, liquid & cake sludges; (leachate and waterworks sludges sent to WWTW for full treatment) • Wastewater liquid sludge is de-watered and mixed with cake; • (Anaerobic digestion & electricity generation); • Sludge drying • Odour treatment • Wastewater pumping station to serve south Letterkenny in the future when a wastewater collection network is developed.

The Wastewater Discharge Licence for the agglomeration of Letterkenny was issued by the Environmental Protection Agency in March 2010 and this is the 4 th Annual Environmental Report.

There were no exceedences of the Emission Limit Values (ELVs) for the following parameters listed in Schedule A of the discharge licence in 2013:

• Temperature • pH • cBOD • COB • Suspended Solids, • Total Oxidised Nitrogen (as N) • Ammonia (as N) • Ortho-Phosphorus (as P)

This represents a significant improvement in the quality of effluent entering the receiving waters since the granting of the wastewater discharge licence. In 2013, the treatment capacity of the plant was greater than the hydraulic and organic loading entering same. The average PE for the treatment plant in 2013 was 18,400. Results from the many analyses are attached in the Appendices at the end of this report with summary tables contained in the body of the document.

The discontinuation of the discharges from the stormwater overflows listed in Schedule A3 of the licence is included in The Letterkenny Sewerage Improvement Scheme, Phase 3. It is expected that this project will go to tender in 2014, depending on the approval of Irish Water and the availability of funding.

4 2.0 Monitoring Reports Summary

2.1 Summary Report on Monthly Influent Monitoring

Appendix 2 contains a table presenting results of monthly influent analysis as required in Condition 4.16 of the licence. These can be summarised as follows: -

BOD COD SS (mg/l) Total P Total Hydraulic Organic (mg/l) (mg/l) (mg/l) N loading Loading (mg/l) (m 3/day) (PE/day) No. of 12 12 12 12 12 Samples Annual Max 191.6 546 249 5.61 48.1 27,673 37,174 Annual 110.9 345.25 173.92 3.27 23.97 10,004 15,975 Mean

While the maximum daily hydraulic loading recorded was 27,673 m3/day on the 31 st January 2013 , this figure is still less than the hydraulic capacity of the treatment works which stands at 32,400 m3/day. This figure was exceptional and over twice the average for the year. It coincided with the highest recorded BOD for the year, which was more than twice the average.

2.2 Discharges from the Agglomeration

Appendix 3 contains a table presenting results of monthly effluent analysis as required in the licence. These can be summarised as follows: -

Temp. pH BOD COD SS Amon Total Total P (mg/l) (mg/l) (mg/l) (mg/l) N(mg/l) (mg/l) WWDL ELV 25 ◦C 6–9 25 125 35 5 15 1* (Schedule A) (max) ELV with 25 ◦C 6–9 50 250 70 5 15 1* Condition 2 (max) Interpretation Number of 12 12 12 12 12 12 12 12 Samples Number of 0 0 0 0 0 0 0 0 Samples above WWDL ELV Number above 0 0 0 0 0 0 0 0 ELV with Cond 2 Interpretaton Annual Mean ( n/a n/a n/a n/a n/a n/a n/a n/a Where Mean ELV applies) Overall Pass Pass Pass Pass Pass Pass Pass Pass Compliance (Pass/Fail)

Emissions Limit Value of 1 applicable from 21 st December 2012, value of 2 applied prior to this date.

5 There were no exceedences of the emission limit values listed in Schedule A on the licence in 2013 which demonstrates that the plant was able to deal comfortably with the hydraulic and organic loading entering the treatment works in 2013.

2.3 Ambient Monitoring Summary

In compliance with the requirements of Conditions 4.17 and 4.18 of the Waste Water Discharge Licence and in accordance with Schedule B4, a summary of the ambient monitoring results for 2013 is tabulated below.

UPSTREAM DOWNSTREAM Range Average Range Average pH 6.84 – 8.32 7.87 6.72 – 8.32 7.77 DO 11.04 – 13.38 12.10 10.27 – 13.16 11.97 BOD 0.43 – 6.70 3.72 0.42 – 7.24 3.77 MRP (Ortho P) 0.015 – 0.048 0.027 <0.01 – 0.076 0.029 Total Nitrogen 0.5 – <10 3.007 0.50 – <10 3.12 Ammonia (as N) 0.042 – 0.186 0.092 <0.01 – 0.216 0.124 DIN 0.07 – 0.267 0.181 0.014 – 0.896 0.292 Chlorophyll 3.16 – 37.71 25.7 1.95 – 48.55 27.29

The location of the discharge point in conjunction with tidal constraints means that ambient monitoring can only take place at high tide. Accordingly, it is possible that the upstream and downstream results can vary depending on whether the tide is ebbing or flowing. Nevertheless, an examination of the results reveals that the discharge is not having a negative impact on the receiving water.

Appendix 4 of this report presents the results of the ambient monitoring taken upstream and downstream of the discharge point in 2013.

Details of the locations of the ambient monitoring points are listed below.

Ambient Monitoring Irish Grid Reference EPA Feature Coding Does assessment of the Point from WWDL Tool ambient monitoring results indicate that the discharge is impacting on water quality? Letterkenny Ambient 1 220354, 412312 TW06007073LS1004 No impact Letterkenny Ambient 2 220398, 412589 TW06007073LS1018 No impact Letterkenny Ambient 3 220850, 412506 TW06007073LS1019 No impact

6 2.4 Data collection and Reporting Requirements under the Waste Water Treatment Directive

The monitoring data was submitted electronically on the 14 th of February 2014 (See Appendix 9).

2.5 Pollutant Release and Transfer Register (PRTR) – Report for the Previous Year

Under Condition 4.14 of the wastewater discharge licence, the licensee is to prepare a Pollutant Release and Transfer Register (PRTR) for the primary discharge. In 2013 the requirement to submit a PRTR only applies to Waste Water Discharge Licences granted to agglomerations greater than 2,000 PE. The PRTR for the primary discharge in the Letterkenny agglomeration for 2013 was submitted and a copy of same is attached to this report in Appendix 6.

3.0 Operational Reports Summary

3.1 Treatment Efficiency Report

Condition 1.8 of the WWDL requires an assessment of the treatment capacity of the plant. Appendix 7 presents a table of monthly quality results of cBOD, COD, SS, Total P and Total N for both the inlet and outlet over the year. The following table presents the average of each analysis for the inlet and outlet and the % reduction achieved through the process: -

cBOD COD SS Total P Total N Influent mass loading (kg/year) 349,471 961,148 510,579 9,407 61,191 Effluent mass emission (kg/year) 10,473 109,359 36,701 1,225 18,338 % Reduction (% reduction of influent load) 97% 87% 93% 87% 83%

3.2 Treatment Capacity Report

Condition 1.8.1 of the WWDL requires an annual assessment of the remaining organic and hydraulic capacity of the plant. The following table presents such an analysis: -

Hydraulic Capacity – Design/As Constructed (m3/day) (3xDWF) 32,400 Hydraulic Capacity – Current loading (m3/day) 9,976 Hydraulic Capacity – Remaining (m3/day) 22,424 Organic Capacity - Design/As Constructed (kgs/day) 2,400 Organic Capacity - Current loading (kgs/day) 958 Organic Capacity – Remaining (kgs/day) 1,442 Will the capacity be exceeded in the next three years? (Yes/No) No

The current hydraulic and organic loading entering the treatment works are less than their respective design capacities which indicates that the plant can sufficiently manage the volumetric flows and organic loading in the agglomeration to licence requirements.

7

3.3 Extent of Agglomeration Summary Report

% of total load generated in the agglomeration Load generated in the agglomeration that is collected in the sewer 65% network (See agglomeration map, Appendix 8) Load collected in the agglomeration that enters treatment plant 61% Load generated in the agglomeration going to individual and 35% appropriate treatment systems Load generated in the agglomeration that is not collected and not 0% individually treated

3.4 Complaints Summary

No complaints of an environmental nature relating to the discharge to waters from the waste water treatment works have been recorded for 2013.

3.5 Reported Incidents Summary

There were no incidents with the potential for environmental contamination of surface water, groundwater or posing an environmental threat to land, or requiring an emergency response by reported in 2013.

3.6 Sludge / Other Inputs to the WWTP

The following table presents volumes of sludge imported to the waste water treatment plant from other sources than the network: -

Input Type M3/year PE/year * % of load Domestic/Septic Tank Sludge 0 Industrial/Commercial Sludge 0 Landfill Leachate (delivered by tanker) 33,522 11,174 <1% Landfill Leachate (delivered by sewer network) 0 Other (Water Services Authority, Water 9,724 324 <1% Treatment Works Alum Sludge, delivered by tanker) * Based on BOD (Leachate 20mg/l, Alum sludge 2mg/l)

8 4.0 Infrastructural Assessments and Programme of Improvements

4.1 Storm Water Overflow Identification and Inspection Report

There are quite a number of storm water overflows in the Letterkenny agglomeration. While an assessment of these has not yet been carried out, the decommissioning of same is included in the Letterkenny Sewerage Improvement Scheme, Phase 3 which is expected to go to tender in 2014, pending the approval of Irish Water.

WWDL Name/ Irish Grid Included Compliance No. of Total Total Estimated Code for Reference in with times volume volume /Measured Storm Water Schedule DoEHLG activated discharged discharged data Overflow A3 & A4 Criteria in 2013 in 2013 in 2013 of the (No. of (m3) (P.E.) WWDL events) SW2 E216369 Yes Not 26 10 3 Estimated N410914 Compliant SW3 E216677 Yes Not 26 20 6 Estimated N410864 Compliant SW4 E216700 Yes Not 26 10 3 Estimated N410885 Compliant SW5 E216700 Yes Not 26 10 3 Estimated N410885 Compliant SW6 E216700 Yes Not 0 0 Estimated N410885 Compliant - SW7 E217342 Yes Not 180 50 15 Estimated N410952 Compliant SW8 E217847 Yes Not 0 0 Estimated N410854 Compliant - SW9 E217847 Yes Not 0 0 Estimated N410854 Compliant - SW11(a)* E218684 Yes Not N411239 Compliant - - - - SW(11b)* E218639 Yes Not N411127 Compliant - - - - * Discontinued during construction of new wastewater treatment plant

How much sewage was discharged via SWOs in the agglomeration in the year 100 (m3/yr)

How much sewage was discharged via SWOs in the agglomeration in the year 30 (p.e.) What % of the total volume of sewage generated in the agglomeration was discharged <5% via SWOs in the agglomeration in 2013? Is each SWO identified as non compliant with DoEHLG Guidance in the Programme of Yes Improvements? The SWO assessment includes the requirements of Schedule A3 & C3 Yes

Have the EPA been advised of any additional SWOs/changes to Schedule C3 and A4 under No changes Condition 1.7?

9 4.2 Report on progress made and proposals being developed to meet the Improvement Programme Requirements

The commissioning of the new Letterkenny Waste Water Treatment Plant and Sludge Treatment Centre fully addressed the improvements specified in Schedule C1 and the requirements of Condition 5.2(a) of the licence.

Condition 5.2(c) and 5.2(d) of the waste water discharge licence requires an assessment of all storm water overflows associated with the waste water works to determine the effectiveness of their operation and to identify improvements necessary to comply with the requirement of the licence. Schedule C3 of the Letterkenny licence specified the upgrading of storm water overflows to comply with the criteria outlined in the DoEHLG “Procedures and Criteria in relation to Storm Water Overflows, 1995” by 31 st December 2013. The Letterkenny Sewerage Improvement Scheme, Phase 3 includes, amongst other things, the decommissioning of all storm water overflows listed in Schedule A3 of the licence. It is expected that this project will go to tender in 2014, depending on the approval of Irish Water and the availability of funding.

Specified Licence Licence Date Status of Works % Licensee Comments Improvement Schedule Completion Expired? (i) Not Started; Construction timeframe Programmes (A or C) Date (N/NA/Y) (ii) At planning Work for (under stage; Completed Completing Schedule A (iii) Work on- the work and C of going on site; WWDL) (iv) Commissioning Phase (v) Completed; (vi) Delayed Discharges to A3 & C3 31 st Y (ii) 0 31 st be discontinued December December - 2013 2015 * Storm Water A4 NA Completed 100 Overflows - -

Improvement 31 st Completed 100 Programme for C1 December - - - Primary 2012 Discharge * Dependent on Irish Water approval and availability of funding

The Sewer Integrity Risk Assessment Tool required for the 2012 AER has not yet been completed.

10 5.0 Licence Specific Reports

The specific licence reports required for Letterkenny have not yet been completed.

Licence Specific Report Required in 2013 AER Included in 2013 Reference to or outstanding from AER relevant section of previous AER AER Priority Substances Report Yes (Condition 4.12) No -

Drinking Water Abstraction Point No - - Risk Assessment Habitats Impact Assessment No - -

Shellfish Impact Assessment Yes (Condition 5.6) No

Pearl Mussel Report No - -

Toxicity/Leachate Management No - -

Toxicity of Final Effluent Report Yes (Condition 4.11) No -

5.1 Priority Substances Report

There was no screening for the presence of organic compounds and metals on a sample of effluent from the discharge point, as required by the Environmental Protection Agency, carried out in 2013.

5.2 Drinking Water Abstraction Point Risk Assessment

Not required.

5.3 Shellfish Impact Assessment Report

A Shellfish Impact Assessment report, as required by Condition No. 5.6 of the waste water discharge licence, was not carried out by Donegal County Council in 2013. It is anticipated that an assessment will be carried out in 2014 where the impact of the discharge from the new wastewater treatment plant on the microbiological quality of the shellfish in the adjacent designated shellfish water can be determined. It should be noted that in the event that the discharge is having a deleterious microbiological effect, a UV disinfection unit was installed during the commissioning of the new waste water treatment plant.

5.4 Toxicity/Leachate Management

Not required.

5.5 Toxicity of the Final Effluent Report

The acute toxicity of the undiluted final effluent from the primary discharge point to at least four relevant aquatic species from different trophic levels was last carried out in 2011 when the old treatment works was still in operation. It is anticipated that a report will be carried out in 2014 where the toxicity of the discharge from the new wastewater treatment plant can be determined.

11 5.6 Pearl Mussel Measures Report

Not required.

5.7 Habitats Impact Assessment Report

Not required.

12

6.0 Certification and Sign Off

Donegal County Council is aware of the environmental risks imposed by the discharge(s) from the agglomeration of LETTERKENNY to the sensitive environment areas such as Special Areas of Conservation, Special Protection Areas and National Heritage Areas, any other environmentally sensitive sites and downstream abstraction points. All relevant sensitive areas associated with the LETTERKENNY agglomeration are outlined/listed as part of the licence application. Mitigation Measures

Donegal County Council has a monitoring regime in place, which is aligned with the conditions in the Licence granted for the discharge(s). This regime will identify any problems which may occur with the discharge(s) and if required appropriate action will be taken. Donegal County Council will make every effort to implement any improvement works required by the licence as listed in the Annual Statement of Measures, subject to available funding and Irish Water Capital Investment Programme.

Management of Financial Risk

Currently Donegal County Council has no insurance policy set up to cover for environmental liability as a result of an accident/incident at a wastewater treatment plant. Donegal County Council has contacted their insurers, Irish Public Bodies Mutual Insurance Limited (IPB) on this matter.

13 Certification and Sign Off

Declaration by Director of Services

Licence Modification Status

There is no need for a modification to the Licence at this time .

Technical Amendment Status

There is no need for a technical amendment to the Licence at this time .

Licence Review Status

There is no need for a Licence Review at this time.

Declaration by Director of Services

This AER includes:

• Executive Summary and Introduction to the 2013 AER • Monitoring Reports Summary • Operational Reports Summary • Infrastructural Assessments and Programme of Improvements • Licence Specific Reports • Certification and Sign Off • Appendices

I certify that the information given in this Annual Environmental Report is truthful, accurate and complete

14 7 Appendices Appendix 1 : Schematics of Letterkenny Waste Water Treatment Plant & Sludge Treatment Centre

LETTERKENNY WWTP - PROCESS FLOW DIAGRAM

Thorn Road Storm Tank Storm Water Return Local Sewer Return Liqours Vol. 3450m3 - Leachate Grove Burn - Alum Sludge Local Sewer - Bunnagee Sewer PStn

Supernatent Return Flow Letterkenny 40,000 P.E. Up to 8DW F

Inlet W orks Inlet Pumping Station - Screening M H16A M H 1 Max. Pump Capacity 375L/s - Grit Removal & Classification M H A Max. 300L/s - Oil Fat & Grease (OFG) Removal (Phase 1)

- 40,000 P.E. @ 225L/P/day = 9000m3/day - Design DWF = 104.2L/s (375m3/hr) - DWF factor 3.6 = 32,400m3/day = 1,350m3/hr

Clarifier Tanks Ø30m Net-Vol. 5,482m3 Aeration Tanks (Carousel Layout) Net-Volume 14,860m3

RAS/WAS PStn - Return Activated Sludge Selector Tank & (75% of Inlet Flow) Splitter Chamber - Waste Activated Sludge (Approx. 5% DWF ~ 3.5tds/d)

WAS flow to Bunnagee STC

Final Effluent PStn Magheranan Washwater Cap. 395L/s UV Disinfection Site Tank Services

Bunnagee Site Services Swilly Outfall 15 LETTERKENNY STC Local Sewer Bunnagee PStn - PROCESS FLOW DIAGRAM

Return to WWTP

Imported Leachate & Alum Sludges Leachate Tank Vol. 465m3 Combined Heat 180kW/h Power Generation Heat & Power Unit connected to ESB Grid Exchanger (CHP) (Circa 1,080 MW/a)

Imported Liquid Sludge 0-6% DS Pre-Digestor Post-Disgestor Storage Tank Anaerobic Storage Tank Vol. 770m3 Digestor Vol. 1,120m3 (3 Days) (5days)

Liquid Sludge Tank Vol. 380m3

Gas Mixing Imported Cake Sludge Cake Sludge 6-25% DS Reception Cake Sludge Reception

Dried WWTP Gravity Belt Thermal Sludge Dryer WAS Sludge Thickener Centrifuge Sludge - 2,500Tds/a @ 6,000hrs/a Silo Gravity Belt - Dryer Output 416kg ds/hr 40m3 Thickener Centrifuge - Evaporation Rate 1.66T O2/hr

Supernatent PStn

Return to WWTP 16 Appendix 2 : Influent Monitoring Results

NH3(as NO3(as NO2(as Ortho Total Total Location Lab. Ref Date pH COND BOD COD SS N) N) N) TON P N P OFG FLOW (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) M3/day Letterkenny

Intake 132501331 31/01/2013 7.48 319 80.6 55 70 5.95 0.1 0.29 0.39 0.37 7.5 1.01 27673 Intake 132501744 26/02/2013 7.81 743 151 384 112 22.7 <0.100 0.07 0.12 1.86 29.9 4.73 6583 Intake 132502110 22/03/2013 7.59 570 78 367 216 14.8 0.1 0.01 0.11 0.432 21.2 3.48 8094 Intake 132502630 30/04/2013 7.47 620 40 326 180 16.7 <0.100 <0.010 0.055 0.513 21.3 2.68 7901 Intake 132503002 23/05/2013 7.65 646 114 369 249 5.46 <0.100 0.05 0.055 0.226 24.7 2.79 8094 Intake 132503668 28/06/2013 7.35 601 157 546 246 21.4 <0.100 0.179 21.58 2.12 27.6 4.29 6249 Intake 132504152 31/07/2013 7.6 783 103.2 534 247 34.700 0.1 0.01 0.11 2.470 31.2 3.35 5501 Intake 132504573 26/08/2013 7.48 828 168.5 450 198 17.900 <0.100 0.01 0.055 2.620 32.7 4.67 4864 Intake 132505102 27/09/2013 7.58 775 191.6 449 246 26 <0.100 0.05 0.1 2.43 48.1 5.61 5578 Intake 132505537 29/10/2013 7.37 400 53.5 116 32 8.010 <0.100 0.1 0.15 0.71 11.200 1.320 17627 Intake 132505789 21/11/2013 7.29 435 72 303 151 9.55 0.133 0.24 0.373 0.78 11.4 2.29 11875 Intake 132506435 12/12/2013 7.55 654 121.4 244 140 18.4 0.301 0.16 0.461 1.31 20.8 2.99 9553

17 Appendix 3 : Effluent Monitoring Analysis with Schedule A Emission Limit Values

NH3(as NO3(as NO2(as Location Lab. Ref Date pH Temp BOD COD SS N) N) N) TON Ortho P (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) Emission limit 25 125 35 5 15 1 Values(ELV) Letterkenny

Letterkenny - outlet 132501332 31/01/2013 7.34 4 1.44 19 16 0.04 1.78 0.04 1.82 0.03 Letterkenny - outlet 132501745 26/02/2013 7.73 4 5.04 31 28 0.09 0.25 <0.010 0.255 0.2 Letterkenny - outlet 132502111 22/03/2013 7.59 4 1.6 22 2 0.04 1.7 0.01 1.71 0.059 Letterkenny - outlet 132502631 30/04/2013 7.25 4 1 13 7 0.147 0.177 <0.010 0.182 0.046 Letterkenny - outlet 132503003 23/05/2013 7.41 4 3.02 32 12.5 0.557 0.285 <0.010 0.29 0.031 Letterkenny - outlet 132503669 28/06/2013 7.45 4 2.86 41 3 0.457 0.234 <0.010 0.696 0.074 Letterkenny - outlet 132504153 31/07/2013 7.48 4 1.7 42 9 1.160 0.228 0.126 0.354 0.088 Letterkenny - outlet 132504574 26/08/2013 7.59 4 2.52 51 20 0.300 0.01 0.25 0.26 0.140 Letterkenny - outlet 132505103 27/09/2013 7.62 4 4.9 39 8 1.32 0.286 0.107 0.393 0.13 Letterkenny - outlet 132505538 29/10/2013 7.38 4 1.48 27 2 <0.010 0.27 <0.010 0.275 0.05 Letterkenny - outlet 132505790 21/11/2013 7.31 4 8.84 52 9 3.02 3.043 0.13 3.173 0.11 Letterkenny - outlet 132506436 12/12/2013 7.94 4 3.02 29 6 3.37 <0.100 0.08 0.13 0.11

18 Appendix 4 : Ambient Monitoring Results

Metal and Ammonia Ortho Total Visual Organic Location Lab. Ref Date pH DO BOD (as N) DIN P N Chlorophyll Inspection Compounds (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) 4/yr 4/yr 4/yr 4/yr 4/yr 4/yr 4/yr 4/yr 4/yr As Required Letterkenny Nothing Upstream SW1 132502447 18/04/2013 8.14 11.04 0.43 0.046 0.267 0.048 0.64 3.16 Observed NT Nothing D/s 1 - SW1 132502448 18/04/2013 7.2 10.27 0.42 0.168 0.896 0.076 1.24 1.95 Observed NT Nothing D/s 2 - SW1 132502449 18/04/2013 8.22 11.08 0.47 0.046 0.247 0.048 0.61 2.53 Observed NT

Nothing Upstream SW1 132503111 29/05/2013 8.16 12.78 2.79 0.186 0.267 0.015 <10 34.38 Observed NT Nothing D/s 1 - SW1 132503112 29/05/2013 8.3 12.05 2.79 0.216 0.369 0.016 <10 38.24 Observed NT Nothing D/s 2 - SW1 132503113 29/05/2013 8.31 12.98 3.23 0.208 0.329 0.019 <10 39.11 Observed NT

Nothing Upstream SW1 132503947 15/07/2013 8.32 13.38 6.7 0.093 0.118 0.016 0.89 37.71 Observed NT Nothing D/s 1 - SW1 132503948 15/07/2013 8.32 13.16 7.24 0.057 0.085 0.009 1.2 Observed NT Nothing D/s 2 - SW1 132503949 15/07/2013 8.26 12.6 5.36 <0.010 0.014 0.008 0.52 21.89 Observed NT

Nothing Upstream SW1 132504321 13/08/2013 6.84 11.19 4.96 0.042 0.07 0.028 0.5 27.54 Observed NT Nothing D/s 1 - SW1 132504322 13/08/2013 6.72 11.29 5.58 0.194 0.255 0.029 0.77 38.73 Observed NT Nothing D/s 2 - SW1 132504323 13/08/2013 6.85 12.36 5.05 0.089 0.139 0.024 0.65 48.55 Observed NT NT : Not Tested

19 Appendix 5 : PE Calculation/Analysis

Location Lab. Ref. Date BOD Flow BOD Kg/Day P.E. Mg/l m3

Intake 132501331 31/01/2013 80.6 27673 2230 37174 Intake 132501744 26/02/2013 151 6583 994 16567 Intake 132502110 22/03/2013 78 8094 631 10522 Intake 132502630 30/04/2013 40 7901 316 5267 Intake 132503002 23/05/2013 114 8094 922 15378 Intake 132503668 28/06/2013 157 6249 981 16351 Intake 132504152 31/07/2013 103.2 5622 580 9670 Intake 132504573 26/08/2013 168.5 4864 820 13,659 Intake 132505102 29/09/2013 191.6 5578 1069 17812 Intake 132505537 29/10/2013 53.5 17627 943 15717 Intake 132505789 21/11/2013 72 11875 855 14250 Intake 132506435 12/12/2013 121.4 9553 1160 19329

20 Appendix 6 : Efficiency Analysis

Daily Daily Daily Daily Mass Mass Daily Mass Mass % % % % % Location NH3 as Nitrate Nitrite Ortho Total Flow Flow Mass Flow Flow Removal Removal Removal Removal Removal Month Date pH BOD COD SS N (as N) (as N) P N Total P Flow BOD COD Flow SS Total N Total P BOD COD SS TN TP (mg/l) (mg/l) (mg/l) Mg/l (mg/l) (mg/l) (mg/l) (mg/l) (mg/l) kgs/Day kgs/Day kgs/Day kgs/Day kgs/Day kgs/Day kgs/Day kgs/Day kgs/Day kgs/Day O*F O*G O*H O*M O*N P7/P6 Q7/Q6 R7/R6 S7/S6 T7/T6 Inlet 31/01/2013 7.48 80.6 55 70 5.95 0.1 0.29 0.37 7.5 1.01 27673 2230.444 1522.015 1937.11 207.5475 27.94973 98.28 66.81 78.04 65.41 71.46 Treated outlet 31/01/2013 7.34 1.44 19 16 0.04 1.78 0.04 0.03 2.7 0.3 26586 38.28384 505.134 425.376 71.7822 7.9758

Inlet 26/02/2013 7.81 151 384 112 22.7 <0.100 0.07 1.86 29.9 4.73 6583 994.033 2527.872 737.296 196.8317 31.13759 96.83 92.34 76.27 95.87 89.56 Treated outlet 26/02/2013 7.73 5.04 31 28 0.09 0.25 <0.010 0.2 1.3 0.52 6249 31.49496 193.719 174.972 8.1237 3.24948

Inlet 22/03/2013 7.59 78 367 216 14.8 0.1 0.01 0.432 21.2 3.48 8094 631.332 2970.498 1748.304 171.5928 28.16712 97.96 94.04 99.08 81.23 92.45 Treated outlet 22/03/2013 7.59 1.6 22 2 0.04 1.7 0.01 0.059 4 0.264 8051 12.8816 177.122 16.102 32.204 2.125464

Inlet 30/04/2013 7.47 40 326 180 16.7 <0.100 <0.010 0.513 21.3 2.68 7901 316.04 2575.726 1422.18 168.2913 21.17468 97.59 96.16 96.25 94.12 91.48 Treated outlet 30/04/2013 7.25 1 13 7 0.147 0.177 <0.010 0.046 1.3 0.237 7614 7.614 98.982 53.298 9.8982 1.804518

Inlet 23/05/2013 7.65 114 369 249 5.46 <0.100 0.05 0.226 24.7 2.79 8094 922.716 2986.686 2015.406 199.9218 22.58226 97.35 91.32 94.98 91.90 88.17 Treated outlet 23/05/2013 7.41 3.02 32 12.5 0.557 0.285 <0.010 0.031 2 0.33 8097 24.45294 259.104 101.2125 16.194 2.67201

Inlet 28/06/2013 7.35 157 546 246 21.4 <0.100 0.179 2.12 27.6 4.29 6249 981.093 3411.954 1537.254 172.4724 26.80821 98.39 93.36 98.92 92.63 91.77 Treated outlet 28/06/2013 7.45 2.86 41 3 0.457 0.234 <0.010 0.074 2.3 0.399 5529 15.81294 226.689 16.587 12.7167 2.206071

Inlet 31/07/2013 7.6 103.2 534 247 34.700 0.1 0.01 2.470 31.2 3.35 5501 567.7032 2937.534 1358.747 171.6312 18.42835 98.32 91.96 96.28 88.54 90.51 Treated outlet 31/07/2013 7.48 1.7 42 9 1.160 0.228 0.126 0.088 3.5 0.311 5622 9.5574 236.124 50.598 19.677 1.748442

Inlet 26/08/2013 7.48 168.5 450 198 17.900 0.1 0.01 2.620 32.7 4.67 4864 819.584 2188.8 963.072 159.0528 22.71488 98.38 87.74 89.08 94.38 90.74 Treated outlet 26/08/2013 7.59 2.52 51 20 0.300 0.01 0.25 0.140 1.7 0.4 5260 13.2552 268.26 105.2 8.942 2.104

Inlet 27/09/2013 7.58 191.6 449 246 26 <0.100 0.05 2.43 48.1 5.61 5578 1068.745 2504.522 1372.188 268.3018 31.29258 97.50 91.51 96.82 88.01 93.50 Treated outlet 27/09/2013 7.62 4.9 39 8 1.32 0.286 0.107 0.13 5.9 0.373 5452 26.7148 212.628 43.616 32.1668 2.033596

Inlet 29/10/2013 7.37 53.5 116 32 8.010 <0.100 0.1 0.71 11.200 1.320 17627 943.0445 2044.732 564.064 197.4224 23.26764 97.14 75.90 93.53 80.59 82.67 Treated outlet 29/10/2013 7.38 1.48 27 2 <0.010 0.27 <0.010 0.05 2.100 0.221 18250 27.01 492.75 36.5 38.325 4.03325

Inlet 21/11/2013 7.29 72 303 151 9.55 0.133 0.24 0.78 11.4 2.29 11875 855 3598.125 1793.125 135.375 27.19375 87.47 82.49 93.92 56.14 79.50 Treated outlet 21/11/2013 7.31 8.84 52 9 3.02 3.043 0.13 0.11 4.9 0.46 12118 107.1231 630.136 109.062 59.3782 5.57428

Inlet 12/12/2013 7.55 121.4 244 140 18.4 0.301 0.16 1.31 20.8 2.99 9553 1159.734 2330.932 1337.42 198.7024 28.56347 97.54 88.24 95.76 69.56 84.45 Treated outlet 12/12/2013 7.94 3.02 29 6 3.37 <0.100 0.08 0.1 6.4 0.47 9451 28.54202 274.079 56.706 60.4864 4.44197

Average % 96.90 87.66 92.41 83.20 87.19

21 Appendix 7 Pollutant Release Transfer Register

22 23

24

25 26

27 Appendix 8 Unsewered Areas Within Letterkenny Agglomeration

28 Appendix 9 Urban Waste Water Treatment Plant Returns 2013

Is the Has the data on Treatment Discharge this row been Effluent Discharge Agglomeration Plant Receiving Local Authority Area Agglomeration Name Directly into Treatment Type CHECKED & Station Code Size (p.e.) Capacity Water a Sensitive UPDATED for (p.e.) Area? 2013? Donegal County 1,353 2,350 Estuarine No 2 – Secondary Council Ardara TPEFF0600D0512SW001 Treatment Yes Donegal County 6,449 4,000 Freshwater No 2 – Secondary Council / TPEFF0600D0120SW001 (River) Treatment Yes Donegal County 1,200 1,000 Freshwater No 2 – Secondary Council Ballyliffen TPEFF0600D0351SW001 (River) Treatment Yes Donegal County 2,637 6,100 Estuarine No 2 – Secondary Council TPEFF0600D0128SW001 Treatment Yes Donegal County 670 260 Freshwater No 2 – Secondary Council Bridgend TPEFF0600D0532SW001 (River) Treatment Yes Donegal County 8,499 13,500 Coastal Water No 1 – Primary Council TPEFF0600D0125SW001 Treatment Yes Donegal County 10,520 9,000 Coastal Water No 0 – Preliminary Council TPEFF0600D0130SW001 Treatment Yes Donegal County 142 180 Freshwater No 2 – Secondary Council Burnfoot TPEFF0600D0531SW001 (River) Treatment Yes Donegal County 4,491 5,200 Freshwater No 2 – Secondary Council TPEFF0600D0113SW001 (River) Treatment Yes Donegal County 700 500 Estuarine No 1 – Primary Council TPEFF0600D0523SW001 Treatment Yes Donegal County 769 600 Freshwater No 1 – Primary Council Castlefinn TPEFF0600D0514SW001 (River) Treatment Yes Donegal County 624 650 Freshwater No 2 – Secondary Council TPEFF0600D0533SW001 (River) Treatment Yes Donegal County 1,199 1,500 Freshwater No 1 – Primary Council Convoy TPEFF0600D0344SW001 (River) Treatment Yes Donegal County Freshwater 2 – Secondary Council TPEFF0600D0534SW001 590 300 (River) No Treatment Yes Donegal County 7,721 12,000 Estuarine No 2 – Secondary Council Donegal Town TPEFF0600D0135SW001 Treatment Yes Donegal County 1,910 1,000 Coastal Water No 1 – Primary Council TPEFF0600D0350SW001 Treatment Yes Donegal County - 1,700 900 Coastal Water No 1 – Primary Council Portnablagh TPEFF0600D0211SW001 Treatment Yes Donegal County 1,694 1,200 Coastal Water No 1 – Primary Council TPEFF0600D0208SW001 Treatment Yes Donegal County 650 1,000 Coastal Water No 1 – Primary Council TPEFF0600D0521SW001 Treatment Yes Donegal County 1 – Primary Council TPEFF0600D0535SW001 938 800 Estuarine No Treatment Yes Donegal County 1,722 Coastal Water No 0 - No Treatment Council TPEFF0600D0343SW001 Yes Donegal County 1,651 1,000 Freshwater No 1 – Primary Council TPEFF0600D0210SW001 (River) Treatment Yes Donegal County 550 1,000 Coastal Water No 0 – Preliminary Council TPEFF0600D0520SW001 Treatment Yes Donegal County 653 800 Freshwater No 2 – Secondary Council Killea TPEFF0600D0537SW001 (River) Treatment Yes

29 Donegal County 81,382 Coastal Water Yes 0 - No Treatment Council TPEFF0600D0011SW001 Yes Donegal County 1,004 1,700 Freshwater No 2 – Secondary Council TPEFF0600D0518SW001 (River) Treatment Yes Donegal County 1,106 500 Freshwater No 2 – Secondary Council TPEFF0600D0513SW001 (River) Treatment Yes Donegal County 18,400 40,000 Estuarine No 2 – Secondary Council Letterkenny TPEFF0600D0009SW001 Treatment Yes Donegal County 1,860 1,550 Estuarine No 1 – Primary Council TPEFF0600D0352SW001 Treatment Yes Donegal County 651 1,000 Estuarine No 2 – Secondary Council TPEFF0600D0519SW001 Treatment Yes Donegal County 1,902 920 Freshwater No 2 – Secondary Council Milford TPEFF0600D0342SW001 (River) Treatment Yes Donegal County 651 380 Freshwater No 2 – Secondary Council TPEFF0600D0522SW001 (River) Treatment Yes Donegal County 450 Freshwater No 0 - No Treatment Council #1 TPEFF0600D0212SW001 (River) Yes Donegal County 407 Freshwater No 0 - No Treatment Council Moville #2 TPEFF0600D0212SW002 (River) Yes Donegal County 998 Coastal Water No 0 - No Treatment Council Moville #3 TPEFF0600D0212SW003 Yes Donegal County 1,265 1,000 Freshwater No 2 – Secondary Council Newtowncunningham TPEFF0600D0349SW001 (River) Treatment Yes Donegal County 1,448 Estuarine No 0 - No Treatment Council TPEFF0600D0341SW001 Yes Donegal County 1,587 800 Freshwater No 2 – Secondary Council TPEFF0600D0209SW001 (River) Treatment Yes Donegal County 757 325 Estuarine No 1 – Primary Council #1 TPEFF0600D0345SW001 Treatment Yes Donegal County 757 Estuarine No 1 – Primary Council Rathmullan #2 TPEFF0600D0345SW002 Treatment Yes Donegal County 827 1,000 Coastal Water No 2 – Secondary Council TPEFF0600D0539SW001 Treatment Yes Donegal County 924 Freshwater No 0 - No Treatment Council (River) Yes

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