Annual Environmental Report
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Annual Environmental Report For Waste Water Discharge Licence D0208-01 Dungloe Agglomeration Licensee Donegal County Council Contents; 1.0 Introduction and Summary 2.0 Monitoring Report 3.0 Operational Report 4.0 Infrastructural Assessment and Programme for Improvements 5.0 Environment Liability and Financial Provision 6.0 Licence Specific Reports 7.0 Certification and Sign Off Appendix Environmental Liability Risk Assessment 1.0 Introduction and Summary Dungloe is a coastal town in west Donegal on the N56 linking Glenties and Gweedore. Wastewater from Dungloe catchment is currently treated to primary stage by an existing septic tank which discharges to Dungloe bay at the mouth of the Dungloe river. This septic tank was built in 1930 and has not had any major refurbishment since. There are a number of smaller septic tanks serving a small number of dwellings outside the normal catchment area of the main septic tank. There is only one primary discharge point from the existing septic tank, discharging into the estuary of Dungloe river as it enters the sea. The tank is desludged annually. The sewers consist of 150mm diameter and 225mm diameter laid mostly along the streets of the town, while short lengths of 100mm connect to small housing estates. There are surface water drains of 300mm and 450mm diameter also on the main street. There is one pumping station in the catchment, located on Quay road, with an emergency overflow discharging into Dungloe bay. This pump station is visited daily by the Waterwork’s Inspector and inspected for operation. There is a duty/standby arrangement in place. There is very little effective treatment of the wastewater in the septic tank due to the current loading of 1600pe. Settlements of some solids, grit and heavier materials is all that can be achieved. Dungloe Sewerage Scheme is listed in the Department of the Environment, Water Services Investment Programme, 2010-2012 as a contract to start (see below). According to the Preliminary Report for the Sewerage Scheme, the 20 year design population for the scheme is 2400pe. This will cater for current and future development outside the existing catchment boundary. The main objectives of the scheme are summarised as follows: • To provide wastewater treatment capacity for the catchment area for a planning horizon of 20 years. • To comply with current E.U. Directives relating to wastewater treatment discharges from urban agglomerations. • To make adequate provision of vital infrastructure to facilitate overall growth and development of the town. CONTRACTS TO START 2010 - 2012 Donegal Ballybofey/Stranorlar Sewerage Schemes · Network S 150,000 Ballyshannon / Rossnowlagh Regional Water Supply Scheme · Water Treatment Plant - DBO W 6,000,000 Bridgend Sewerage Scheme (G/SLI) · Wastewater Treatment Plant & Network S 500,000 Donegal (Group B) Sewerage Schemes 1 · Wastewater Treatment Plants - DBO S 25,000,000 Donegal (Group B) Sewerage Schemes 1 · Networks S 5,000,000 Scheme Name Contract Name W/S Estimated Cost Scheme Name Contract Name W/S Estimated Cost 29 Water Services Investment Programme 2010-2012 Donegal Town Sewerage Scheme (SLI) · Network (Brookfield) S 103,000 Glenties/Dungloe Sewerage Schemes · Wastewater Treatment Plants - DBO S 7,000,000 Gweedore Sewerage Scheme · Network S 8,500,000 Gweedore Sewerage Scheme · Wastewater Treatment Plant S 2,900,000 Killybegs Sewerage Scheme · Contract 2 (Main Pumping Station & Outfall) S 16,500,000 Letterkenny Sewerage Scheme (G) · Wastewater Treatment Plant - DBO S 25,000,000 Water Conservation Stage 3 Works · Watermains Rehabilitation Project Phase 1 W 3,100,000 TOTAL 121,033,000 1 Bundoran, Killybegs, Convoy and Glencolumbcille 2.0 Monitoring Report As licences were not granted until Dec 2011, we only have results for BOD, COD and SS in accordance with the requirements of the Urban Wastewater Regulations. None of the extra testing in compliance with Schedule B of the licence has been tested for 2011; however since 2012 sampling is underway in accordance with the schedule. Quality Results by Date Location Lab Ref Date Northing Easting pH BOD COD SS (mg/l) (mg/l) (mg/l) Dungloe no. 1 - inlet 112501510 16/02/2011 411418 176788 7.4 86.2 210 66 Dungloe no. 1 - outlet 112501511 16/02/2011 411419 176778 7.46 77.8 227 82 Dungloe no. 1 - inlet 112502426 14/04/2011 411418 176788 7.47 80.9 209 18 Dungloe no. 1 - outlet 112502427 14/04/2011 411419 176778 7.41 111.3 286 54 Dungloe no. 1 - inlet 112503296 09/06/2011 411418 176788 7.04 38.4 118 30 Dungloe no. 1 - outlet 112503297 09/06/2011 411419 176778 7.06 28.4 110 42 Dungloe no. 1 - inlet 112504079 21/07/2011 411418 176788 7.47 149.6 302 150 Dungloe no. 1 - outlet 112504080 21/07/2011 411419 176778 7.29 122.4 286 112 Dungloe no. 1 - inlet 112505 290 27/09/2011 411418 176788 6.85 <10 161 70 Dungloe no. 1 - outlet 112505291 27/09/2011 411419 176778 7.04 <10 174 22 Dungloe no. 1 - inlet 112506504 07/12/2011 411418 176788 7.41 36.94 146 35 Dungloe no. 1 - outlet 112506505 07/12/2011 411419 176778 7.41 36.1 136 20 Quality Results Location Lab Ref Date pH BOD COD SS (mg/l) (mg/l) (mg/l) Dungloe no. 1 - inlet 112501510 16/02/2011 7.4 86.2 210 66 Dungloe no. 1 - inlet 112502426 14/04/2011 7.47 80.9 209 18 Dungloe no. 1 - inlet 112503296 09/06/2011 7.04 38.4 118 30 Dungloe no. 1 - inlet 112504079 21/07/2011 7.47 149.6 302 150 Dungloe no. 1 - inlet 112505290 27/09/2011 6.85 <10 161 70 Dungloe no. 1 - inlet 112506504 07/12/2011 7.41 36.94 146 35 Dungloe no. 1 - outlet 112501511 16/02/2011 7.46 77.8 227 82 Dungloe no. 1 - outlet 112502427 14/04/2011 7.41 111.3 286 54 Dungloe no. 1 - outlet 112503297 09/06/2011 7.06 28.4 110 42 Dungloe no. 1 - outlet 112504080 21/07/2011 7.29 122.4 286 112 Dungloe no. 1 - outlet 112505291 27/09/2011 7.04 <10 174 22 Dungloe no. 1 - outlet 112506505 07/12/2011 7.41 36.1 136 20 Influent Location Lab Ref Date Northing Easting pH BOD COD SS (mg/l) (mg/l) (mg/l) Dungloe no. 1 - inlet 112501510 16/02/2011 411418 176788 7.4 86.2 210 66 Dungloe no. 1 - inlet 112502426 14/04/2011 411418 176788 7.47 80.9 209 18 Dungloe no. 1 - inlet 112503296 09/06/2011 411418 176788 7.04 38.4 118 30 Dungloe no. 1 - inlet 112504079 21/07/2011 411418 176788 7.47 149.6 302 150 Dungloe no. 1 - inlet 112505290 27/09/2011 411418 176788 6.85 <10 161 70 Dungloe no. 1 - inlet 112506504 07/12/2011 411418 176788 7.41 36.94 146 35 Effluent Location Lab Ref date Northing Easting pH BOD COD SS (mg/l) (mg/l) (mg/l) Dungloe no. 1 - outlet 112501511 16/02/2011 411419 176778 7.46 77.8 227 82 Dungloe no. 1 - outlet 112502427 14/04/2011 411419 176778 7.41 111.3 286 54 Dungloe no. 1 - outlet 112503297 09/06/2011 411419 176778 7.06 28.4 110 42 Dungloe no. 1 - outlet 112504080 21/07/2011 411419 176778 7.29 122.4 286 112 Dungloe no. 1 - outlet 112505291 27/09/2011 411419 176778 7.04 <10 174 22 Dungloe no. 1 - outlet 112506505 07/12/2011 411419 176778 7.41 36.1 136 20 3.0 Operational Report Donegal County Council has assigned a Waterwork’s Inspector to maintain the existing sewerage infrastructure in Dungloe. The pumping station on Quay road is inspected daily for evidence of malfunction, overloading or blocking. The “Amps” reading indicates whether the pump is running freely or requires cleaning due to a build up of matter. There is an automatic changeover in place so if a pump trips or blocks, the second pump kicks in automatically. Every two to three weeks, the pumps are lifted using a block and tackle, cleaned and greased and maintained as necessary. An electrician and fitter also assist with this work. The overflow pipe is also checked to see if it has been operational and the non return flap at end in place. Generally both pumps are not down at the same time and the overflow is not used. Other operational work on sewer network involves ensuring all sewers are running freely and without any build up of debris. Dates when specialist jetting equipment has been used are listed. 20 th July Main sewer line jetted out and flushed in Dungloe 18 th July Jetting and flushing of main sewer on main street and Chapel road 12 th July Emptying and Cleaning out sewage pumping station on quay road. 4th July Jetting out blocked sewer. 7th August Cleaning out blocked sewer main Street 4.0 Infrastructural Assessment and Programme for Improvements The existing septic tank serving Dungloe provides an insufficient level of treatment to deal with the wastewater generated in the catchment. Settlement of some solids, grit and heavier materials is all that can be achieved. Dungloe Sewerage Scheme and Glenties Sewerage Scheme are listed together in the Department of the Environment, Water Services Investment Programme, 2010-2012 as a combined design, build, operate scheme. According to the Preliminary Report for the Sewerage Scheme, the 20 year design population for the scheme is 2400pe. This constitutes a 44% increase on the existing population and corresponds to a medium growth rate. This will cater for current and future development outside the existing catchment boundary.