For inspection purposes only.

Transcription

1 E. Emissions E.1 Emissions to Atmosphere E.1.A Details of all Point Emissions to Atmosphere The atmospheric emission points for the power plant are listed hereunder. More comprehensive information on emissions is provided in Table E.1 (ii). In addition, the locations of emission points are illustrated in Figure E.1.1 Atmospheric Emissions Points. Boiler Emissions There will be no boiler emissions from the power plant. Main Emissions Exhaust gases from the 7 no. Wärtsilä 18V50DF engines gas engine will be emitted to atmosphere through 7 no. flue exhausts which will be combined into 2 no. stacks located to the north of the main building on site. One stack will accommodate 3 no. flue exhausts and the other stack will accommodate 4 no. flue exhausts. Both stacks will be 25 metres in height. The power plant is expected to operate primarily on natural gas and only in very rare circumstance on distillate oil in the event of emergency scenario or an interruption to gas supplies. There will be two main emission points, as identified below: Gas Engine Stack 1 (A2-1); Gas Engine Stack 2 (A2-2). The Industrial Emissions Directive specifies the emission limit values for certain categories of power plants. In the case of the Grange BackUp Power plant facility, it should be noted that this power plant is considered to be a gas engine in accordance with the definitions set out in the Directive, i.e. an internal combustion engine which operates according to the Otto cycle and uses spark ignition, or in case of dual fuel engines, compression ignition to burn fuel. The plant is therefore required to comply with the emission limit values for gas engines as specified in Annex V the Directive. In relation to its operation on back up fuel, i.e. low sulphur distillate oil, it should be noted that the Directive does not identify specific emission limit values for gas engines. In these operating scenarios the power plant is required only to comply with the Large Combustion Plant BREF (2006) [refer Section 1.8c]. A stated previously in this application, the plant will only operate on low sulphur distillate oil in emergency situations and for short duration testing as required by the Commission for Energy Regulation (CER) and EirGrid. This operating requirement is recognised in the grant of planning permission issued by South Dublin County Council (Planning Register: SD15A/0061) which states under Condition No. 3 that oil fired power generation shall only be used in the event of emergency operation and shall not be used for any normal operating period. 46

2 Minor Emissions There will be six minor emission points as described hereunder: A3-1 Fuel Oil Storage Tank; A3-2 Leak Fuel Tank Vent (clean); A3-3 Leak Fuel Tank Vent (dirty); A3-4 Sludge Tank; A3-5 Diesel Fired Fire Fighting Pump; and A3-6 SCR Reagent Tank (Urea). Minor emissions from fuel burning include Nitrogen Oxides (NOx), Carbon Monoxide (CO), Carbon Dioxide (CO2) and particulates. Natural gas is a clean fuel with negligible sulphur and particulate matter content. Diesel will be restricted to 0.1% Sulphur and will be of a high grade with limited particulate matter content. Emissions to atmosphere from the minor emission sources will not be significant. A3-1 Fuel Oil Storage Tank In order to comply with Commission for Energy Regulation (CER) regulations low sulphur distillate oil will be stored as a backup fuel in the event of interruption to the natural gas supply. Up to 72 hours (3 days) maximum running capacity of diesel is required to be stored on site (approximately 2,000m³) in a bunded tank. There is potential for very minor emission loss from the distillate oil tank for an air vent and also during connection for refuelling. It should be noted that the storage, transfer and handling techniques will comply with Reference Document on Best Available Techniques on Emissions from Storage (2006) and IPC Guidance Note on Storage and Transfer of Materials for Scheduled Activities, EPA (2004). Emissions from the fuel oil storage tank vent will therefore not be significant. A3-2 Leak Fuel Tank Vent (clean) Clean leak fuel is drained by gravity from the engine. The fuel is collected in a separate clean leak fuel tank with a storage capacity of 50m³, from where it can be pumped to the main distillate fuel storage tank (storage capacity 2000m 3 ) and reused without separation. This tank has potential for very minor emission losses through an air vent. However these will not be significant. A3-3 Leak Fuel Tank Vent (dirty) There is potential for fuel or water to spill in the hot box of the engine which will be collected and drained by gravity to the dirty leak fuel tank which has a capacity of 80m³. This tank has potential for very minor emission losses through an air vent. However these will not be significant. 47

3 A3-4 Sludge Tank Dirty leak fuel is drained ultimately to the sludge tank. This tank has potential for very minor emission losses through an air vent. However these will not be significant. A3-5 Diesel Fired Fire Fighting Pump The firefighting pump will operate on diesel. The pump will be located within the fire pump house. The pump will only be used in an emergency and for short duration testing, for a maximum of 30 minutes once a week. The pump will have an electrical output of less than 100 kw. A3-6 SCR Reagent (Urea) Tank The most commonly used secondary emission control method for NO X is the Selective Catalytic Reduction (SCR) technique. In the SCR system the NO X (NO and NO 2 ) are reduced with the help of a reducing agent such as urea which will be stored in a dedicated tank with a volume of 150m³. SCR does not produce any liquid or solid by-products and is suitable for both liquid and gaseous fuels. This tank has potential for very minor emission losses through an air vent. However these will not be significant. 48

4 Notes N 1. THIS DRAWING IS TO BE READ IN CONJUNCTION WITH ALL RELEVANT ARCHITECTS AND ENGINEERS DRAWINGS AND SPECIFICATIONS. 2. DO NOT SCALE, USE FIGURED DIMENSIONS ONLY. 3. ANY DISCREPANCIES TO BE REPORTED TO THE ARCHITECT. 4. ALL DIMENSIONS ARE IN MILLIMETERS. 5. ALL LEVELS ARE IN METRES RELATIVE TO ORDNANCE SURVEY DATUM MALIN HEAD. Key to symbols ENGINE HALL ANCILLIARY TANKS, PLANT, EQUIPMENT AND BUILDINGS EMISSION POINT Reference drawings A ot he ru 8 se ns en 17 Co to f c Fo op r i yr ns ig pe ht ct ow ion ne pu r r rp eq os ui es re o d nl fo y. ra ny A B m 0 25m 1:200 P1 29/09/15 Rev Date SHY Drawn MMcC PK For Planning Description Mott MacDonald South Block, Rockfield, Dundrum, Dublin 16, Ireland T F W +353 (0) (0) Client Grange Back Up Power Ltd Title Figure E.1.1 Atmospheric Emissions Point Designed Others Drawn S. Healy Dwg check M.McCarthy Scale at A0 Mott MacDonald 1:200 Eng check Others Coordination Approved Status APR Rev P.Kelly Security P1 STD Drawing Number This document is issued for the party which commissioned it and for specific purposes connected with the captioned project only. It should not be relied upon by any other party or used for any other purpose. We accept no responsibility for the consequences of this document being relied upon by any other party, or being used for any other purpose, or containing any error or omission which is due to an error or omission in data supplied to us by other parties. P:\Dublin\MPD\ Grange Power\CAD\Figure E.1.1.dwg Sep 30, :27PM hea38245 MMD N-DR-00-XX-0007

5 TABLE E.1(ii) MAIN EMISSIONS TO ATMOSPHERE Emission Point Ref. N o : A2-1 Source of Emission: Engine Operating on Natural Gas Location: Stack No.1 1 Grid Ref. (12 digit, 6E,6N): E, N Vent Details Diameter: Height above Ground(m): Date of commencement: Characteristics of Emission: 2.77 metres 25.0 metres TBC (i) Volume to be emitted: 80 Nm 3 /s (dry) 2 Average/day Nm 3 /d Maximum/day Nm 3 /d Maximum rate/hour 288,000 Nm 3 /h (ii) Other factors Min efflux velocity m.sec -1 Temperature 405 o C(max) 352 o C(min) 373 o C(avg) For Combustion Sources: Volume terms expressed as : wet. dry. %O 2 (iii) Period or periods during which emissions are made, or are to be made, including daily or seasonal variations (start-up /shutdown to be included): 1 All individual stacks are collected to two clusters of 4 and 3 stacks. Stack No.1 will have 4 engines in the cluster 2 20 Nm3/s (dry) for 1 no. engine which equates to 80 Nm3/s (dry) for 4 no. engines m/s per engine (100% engine load) 49

6 Periods of Emission (avg) 4 60 min/hr 24 hr/day 365 day/yr 4 Period of emission will be as instructed by the TSO EirGrid and whilst the plant is expected to operate to meet peak demand, the hours of operation could potentially occur at any time during the day or night. 50

7 TABLE E.1(iii): MAIN EMISSIONS TO ATMOSPHERE - Chemical characteristics of the emission Emission Point Reference Number: A2-1: Engine Operating on Natural Gas Parameter Prior to treatment (1) Brief As discharged (1) mg/nm 3 kg/h description mg/nm 3 kg/h. kg/year Avg Max Avg Max of treatment Avg Max Avg Max Avg Max NO x N/A N/A N/A N/A SO 2 N/A N/A N/A N/A Selective catalytic reduction SO 2 emissions minimised when firing on natural gas CO 2 N/A N/A N/A N/A Fuel Type CO N/A N/A N/A N/A Combustion Control Particulate Matter N/A N/A N/A N/A Particulate matter emissions minimised when firing on natural gas Concentrations should be based on Normal conditions of temperature and pressure, (i.e. 0 o C,101.3kPa). Wet/dry should be the same as given in Table E.1(ii) unless clearly stated otherwise. 5 Calculated as NO2. 51

8 TABLE E.1(ii) MAIN EMISSIONS TO ATMOSPHERE Emission Point Ref. N o : A2-1 Source of Emission: Engine Operating on Low Sulphur Distillate Oil 6 Location: Grid Ref. (12 digit, 6E,6N): Stack No E, N Vent Details Diameter: Height above Ground(m): Date of commencement: Characteristics of Emission: 2.77 metres 25.0 metres TBC (i) Volume to be emitted: 100 Nm 3 /s (dry) 7 Average/day Nm 3 /d Maximum/day Nm 3 /d Maximum rate/hour 360,000 Nm 3 /h (ii) Other factors Min efflux velocity 8 112m.sec -1 Temperature 361 o C(max) 276 o C(min) 345 o C(avg) For Combustion Sources: Volume terms expressed as : wet. dry. %O 2 6 it should be noted also that the Industrial Emissions Directive does not identify emission limit values for gas engines when operating on back up fuel, i.e. low sulphur distillate oil. In these operating scenarios the power plant is required only to comply with the Large Combustion Plant BREF (2006) nm3/s (dry) for 1 no. engine which equates to 100 Nm 3 /s (dry) for 4 no. engines m/s per engine (100% engine load) 52

9 (iii) Period or periods during which emissions are made, or are to be made, including daily or seasonal variations (start-up /shutdown to be included): Periods of Emission 9 (avg) 60 min/hr 24 hr/day 365 day/yr 9 9 Period of emission will be as instructed by the TSO EirGrid and whilst the plant is expected to operate to meet peak demand, the hours of operation could potentially occur at any time during the day or night. 53

10 TABLE E.1(iii): MAIN EMISSIONS TO ATMOSPHERE - Chemical characteristics of the emission Emission Point Reference Number: A2-1: Engine Operating on Low Sulphur Distillate Oil 10 Parameter Prior to treatment (1) Brief As discharged (1) mg/nm 3 kg/h description mg/nm 3 kg/h. kg/year Avg Max Avg Max of treatment Avg Max Avg Max Avg Max NO x N/A N/A N/A N/A SO 2 N/A N/A N/A N/A Selective catalytic reduction Very Low Sulphur Fuel (0.1%) CO 2 N/A N/A N/A N/A Fuel Type CO N/A N/A N/A N/A Combustion Control Particulate Matter N/A N/A N/A N/A Fuel Type Concentrations should be based on Normal conditions of temperature and pressure, (i.e. 0 o C,101.3kPa). Wet/dry should be the same as given in Table E.1(ii) unless clearly stated otherwise. 10 it should be noted also that the Industrial Emissions Directive does not identify emission limit values for gas engines when operating on back up fuel, i.e. low sulphur distillate oil. In these operating scenarios the power plant is required only to comply with the Large Combustion Plant BREF (2006). 54

11 TABLE E.1(ii) MAIN EMISSIONS TO ATMOSPHERE Emission Point Ref. N o : A2-2 Source of Emission: Engine Operating on Natural Gas Location: Stack No.2 11 Grid Ref. (12 digit, 6E,6N): E, N Vent Details Diameter: Height above Ground(m): Date of commencement: Characteristics of Emission: 3.20 metres 25.0 metres TBC (i) Volume to be emitted: 60 nm 3 /s (dry) 12 Average/day Nm 3 /d Maximum/day Nm 3 /d Maximum rate/hour 216,000 Nm 3 /h (ii) Other factors Min efflux velocity m.sec -1 Temperature 405 o C(max) 352 o C(min) 373 o C(avg) For Combustion Sources: Volume terms expressed as : wet. dry. %O 2 (iii) Period or periods during which emissions are made, or are to be made, including daily or seasonal variations (start-up /shutdown to be included): 11 Stack No.2 will have 3 engines in the cluster nm3/s (dry) for 1 no. engine which equates to 60 Nm 3 /s (dry) for 3 no. engines m/s per engine (100% engine load) 55

12 Periods of Emission 14 (avg) 60 min/hr 24 hr/day 365 day/yr Period of emission will be as instructed by the TSO EirGrid and whilst the plant is expected to operate to meet peak demand, the hours of operation could potentially occur at any time during the day or night. 56

13 TABLE E.1(iii): MAIN EMISSIONS TO ATMOSPHERE - Chemical characteristics of the emission Emission Point Reference Number: A2-2: Engine Operating on Natural Gas Parameter Prior to treatment (1) Brief As discharged (1) mg/nm 3 kg/h description mg/nm 3 kg/h. kg/year Avg Max Avg Max of treatment Avg Max Avg Max Avg Max NO x N/A N/A N/A N/A SO 2 N/A N/A N/A N/A Selective catalytic reduction SO 2 emissions minimised when firing on natural gas CO 2 N/A N/A N/A N/A Fuel Type CO N/A N/A N/A N/A Combustion Control Particulate Matter N/A N/A N/A N/A Particulate matter emissions minimised when firing on natural gas Concentrations should be based on Normal conditions of temperature and pressure, (i.e. 0 o C,101.3kPa). Wet/dry should be the same as given in Table E.1(ii) unless clearly stated otherwise. 15 Calculated as NO2. 57

14 TABLE E.1(ii) MAIN EMISSIONS TO ATMOSPHERE Emission Point Ref. N o : A2-2 Source of Emission: Engine Operating on Low Sulphur Distillate Oil 16 Location: Grid Ref. (12 digit, 6E,6N): Stack No E, N Vent Details Diameter: Height above Ground(m): Date of commencement: Characteristics of Emission: 3.20 metres 25.0 metres TBC (i) Volume to be emitted: 75 nm 3 /s (dry) 17 Average/day Nm 3 /d Maximum/day Nm 3 /d Maximum rate/hour 270,000 Nm 3 /h (ii) Other factors Min efflux velocity m.sec -1 Temperature 361 o C(max) 276 o C(min) 345 o C(avg) For Combustion Sources: Volume terms expressed as : wet. dry. %O 2 16 It should be noted also that the Industrial Emissions Directive does not identify emission limit values for gas engines when operating on back up fuel, i.e. low sulphur distillate oil. In these operating scenarios the power plant is required only to comply with the Large Combustion Plant BREF (2006) nm3/s (dry) for 1 no. one engine which equates to 75 nm 3 /s (dry) for 3 no. engines m/s per engine (100% engine load) 58

15 (iii) Period or periods during which emissions are made, or are to be made, including daily or seasonal variations (start-up /shutdown to be included): Periods of Emission (avg) min/hr 24 hr/day 365 day/yr Period of emission will be as instructed by the TSO EirGrid and whilst the plant is expected to operate to meet peak demand, the hours of operation could potentially occur at any time during the day or night. 59

16 TABLE E.1(iii): MAIN EMISSIONS TO ATMOSPHERE - Chemical characteristics of the emission Emission Point Reference Number: A2-2: Engine Operating on Low Sulphur Distillate Oil 20 Parameter Prior to treatment (1) Brief As discharged (1) mg/nm 3 kg/h description mg/nm 3 kg/h. kg/year Avg Max Avg Max of treatment Avg Max Avg Max Avg Max NO x N/A N/A N/A N/A SO 2 N/A N/A N/A N/A Selective catalytic reduction Very Low Sulphur Fuel (0.1%) CO 2 N/A N/A N/A N/A Fuel Type CO N/A N/A N/A N/A Combustion Control Particulate Matter N/A N/A N/A N/A Fuel Type Concentrations should be based on Normal conditions of temperature and pressure, (i.e. 0 o C,101.3kPa). Wet/dry should be the same as given in Table E.1(ii) unless clearly stated otherwise. 20 It should be noted also that the Industrial Emissions Directive does not identify emission limit values for gas engines when operating on back up fuel, i.e. low sulphur distillate oil. In these operating scenarios the power plant is required only to comply with the Large Combustion Plant BREF (2006). 60

17 E.3 Emissions to Surface Waters The surface water drainage design philosophy has been prepared in accordance with the requirements of the following technical design guidance publications: The Greater Dublin Strategic Drainage Study (GDSDS); EN 752 Gravity Drainage Systems outside Buildings; CIRIA Report C697 The SUDS Manual. Surface water will be collected from two catchment areas within the site. The western catchment includes the pavement in the vicinity of the fuel oil unloading bay and pumped surface water discharge from the oil storage tank bund. Although the fuel storage tank is located within a bunded area, rainwater which falls here is likely to be clean in the absence of an oil spill or leak. As a result, a sump and pumping arrangement located within the bund will allow clean rainwater to be pumped into the collection system when required. Pumping will be manually activated and will pass through a Class 1 full retention Enviroceptor to avoid pumping contaminated water. Run-off from other paved areas and roof area (e.g. workshop) will also drain through the Class 1 Enviroceptor. The eastern catchment consists mostly of the engine house and pavement areas which will drain through a Bypass Separator. It is proposed that surface water will be collected from roofed buildings via standard rainwater down pipes while runoff from un-roofed structures will drain to the access roads where it will enter via road gullies. Some additional gullies, acco-drains or similar collection device may be specified at detailed design stage for large un-roofed paved areas if required. It is also proposed that gullies and drain entry points will incorporate silt traps to remove any grit or silt which may be washed into the drainage system The Class 1 Enviroceptor and the Bypass Separators will be fitted with visual and audible alarms to ensure containment facilities are adequately maintained. In addition, this alarm will be linked to auto dial facilities such that relevant staff can be alerted. The western and eastern catchment areas will have their own surface water attenuation tanks. The western catchment attenuation tank will have a storage volume of 80m³ and the eastern catchment attenuation tank will have a storage capacity of 150m³.These tanks have been designed to accommodate a 1:100 year storm event and will discharge via hydro-brakes to the existing surface water drainage system within the Grange Castle Business Park. All surface water generated on site will ultimately discharge to the attenuation pond to the north east of the Business Park. It should be noted also in this respect that no development on site shall commence until such time as a Connection Agreement has been signed with Irish Water [Planning Condition No. 4] and proposals for surface water monitoring have been with South Dublin County Council and Inland Fisheries Ireland [Planning Condition No. 9]. 61

18 The surface water emissions to the existing surface water drainage system are illustrated in Figure E.3.1 Emissions to Surface Waters. SW1 is the emission point for the eastern catchment and SW2 is the emission point for the western catchment. More comprehensive information on the characteristics of the emissions to surface waters are provided in Table E.3 (i). 62

19 Notes 1. THIS DRAWING IS TO BE READ IN CONJUNCTION WITH ALL RELEVANT ARCHITECTS AND ENGINEERS DRAWINGS AND SPECIFICATIONS. 2. DO NOT SCALE, USE FIGURED DIMENSIONS ONLY. 3. ANY DISCREPANCIES TO BE REPORTED TO THE ARCHITECT. 4. ALL DIMENSIONS ARE IN MILLIMETERS. 5. ALL LEVELS ARE IN METRES RELATIVE TO ORDNANCE SURVEY DATUM MALIN HEAD. Key to symbols 0008 ENGINE HALL ANCILLIARY TANKS, PLANT, EQUIPMENT AND BUILDINGS N EMISSION POINT Reference drawings he AA Co ns en to f c Fo op r i yr ns ig pe ht ct ow ion ne pu r r rp eq os ui es re o d nl fo y. ra ny 8 10 ot 4 AA ru 11 8 se 18 1 BB m 0 25m 1:200 P1 29/09/15 Rev Date SHY Drawn MMcC PK For Planning Description Mott MacDonald South Block, Rockfield, Dundrum, Dublin 16, Ireland T F W +353 (0) (0) Client Grange Back Up Power Ltd Title Figure E.3.1 Emissions to Surface Waters Designed Others Drawn S. Healy Dwg check M.McCarthy Scale at A0 Mott MacDonald 1:200 Eng check Others Coordination Approved Status APR Rev P.Kelly Security P1 STD Drawing Number This document is issued for the party which commissioned it and for specific purposes connected with the captioned project only. It should not be relied upon by any other party or used for any other purpose. We accept no responsibility for the consequences of this document being relied upon by any other party, or being used for any other purpose, or containing any error or omission which is due to an error or omission in data supplied to us by other parties. P:\Dublin\MPD\ Grange Power\CAD\Figure E.3.1.dwg Oct 2, :42AM hea38245 MMD N-DR-00-XX-0008

20 TABLE E.2(i): EMISSIONS TO SURFACE WATERS Emission Point: SW1 Emission Point Ref. N o : Source of Emission: Location of discharge : SW-1 Surface Water Run-off Grange Castle Business Park Grid Ref. (12 digit, 6E,6N): Name of receiving waters and water body code: Flow rate in receiving waters: N/A Available assimilative capacity: Emission Details: (i) Volume to be emitted E, N Irish Water Surface Water Drainage System prior to discharge to the attenuation pond to the north east of the Business Park N/A Normal/day N/A Maximum/day N/A Maximum rate/hour m 3 (ii) Period or periods during which emissions are made, or are to be made, including daily or seasonal variations (start-up /shutdown to be included): Periods of Emission (avg) min/hr 24 hr/day 365 day/yr 21 Subject to rainfall. 63

21 TABLE E.2(ii): EMISSIONS TO SURFACE WATERS - Characteristics of the emission Emission point reference number: SW1 Parameter Prior to treatment As discharged % Efficiency Max. hourly average (mg/l) Max. daily average (mg/l) kg/day kg/year Max. hourly average (mg/l) Max. daily average (mg/l) kg/day kg/year N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 64

22 TABLE E.2(i): EMISSIONS TO SURFACE WATERS Emission Point: SW2 Emission Point Ref. N o : Source of Emission: Location of discharge : SW-2 Surface Water Run-off Grange Castle Business Park Grid Ref. (12 digit, 6E,6N): Name of receiving waters and water body code: Flow rate in receiving waters: N/A Available assimilative capacity: Emission Details: (i) Volume to be emitted E, N Irish Water Surface Water Drainage System prior to discharge to the attenuation pond to the north east of the Business Park N/A Normal/day N/A Maximum/day N/A Maximum rate/hour m 3 (ii) Period or periods during which emissions are made, or are to be made, including daily or seasonal variations (start-up /shutdown to be included): Periods of Emission (avg) 60 min/hr 24 hr/day 365 day/yr Subject to rainfall. 65

23 TABLE E.2(ii): EMISSIONS TO SURFACE WATERS - Characteristics of the emission Emission point reference number: SW2 Parameter Prior to treatment As discharged % Efficiency Max. hourly average (mg/l) Max. daily average (mg/l) kg/day kg/year Max. hourly average (mg/l) Max. daily average (mg/l) kg/day kg/year N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 66

24 E.4 Emissions to Sewer Foul wastewater from the power plant will consist of domestic effluent from the toilets, sinks, etc. on-site. This wastewater will be discharged from the site via an appropriately sized pumping station at SE1 and will connect to the existing foul drainage system in Grange Castle Business Park which in turn discharges to the South Dublin County Council foul drainage system which ultimately discharges to the Ringsend Wastewater Treatment Plant. Process wastewater to be generated from the facility will consist of the waste stream arising from the treatment of purified water for injection into the engine during the combustion process to control NOx emissions. This wastewater will have a volume of approximately 0.5m 3 /hr and will connect to the proposed foul drainage system at SE2. The foul wastewater emissions to the existing Grange Castle Business Park foul drainage system are illustrated in Figure E.4.1 Emissions to Sewer. More comprehensive information on the characteristics of the emissions to sewer is provided in Table E.3 (ii). 67

25 P1 29/09/15 SHY For Planning MMcC PK T F W Notes 1. THIS DRAWING IS TO BE READ IN CONJUNCTION WITH ALL RELEVANT ARCHITECTS AND ENGINEERS DRAWINGS AND SPECIFICATIONS. 2. DO NOT SCALE, USE FIGURED DIMENSIONS ONLY. 3. ANY DISCREPANCIES TO BE REPORTED TO THE ARCHITECT. 4. ALL DIMENSIONS ARE IN MILLIMETERS. 5. ALL LEVELS ARE IN METRES RELATIVE TO ORDNANCE SURVEY DATUM MALIN HEAD. Key to symbols 0008 ENGINE HALL N ANCILLIARY TANKS, PLANT, EQUIPMENT AND BUILDINGS EMISSION POINT Reference drawings A A B B : m 25m Rev Date Drawn Description Ch k d App d Mott MacDonald South Block, Rockfield, Dundrum, Dublin 16, Ireland +353 (0) (0) Client Grange Back Up Power Ltd Title Figure E.4.1 Emissions to Sewer Designed Others Eng check Others Drawn S. Healy Coordination Dwg check M.McCarthy Approved P.Kelly Mott MacDonald This document is issued for the party which commissioned it and for specific purposes connected with the captioned project only. It should not be relied upon by any other party or used for any other purpose. We accept no responsibility for the consequences of this document being relied upon by any other party, or being used for any other purpose, or containing any error or omission which is due to an error or omission in data supplied to us by other parties. P:\Dublin\MPD\ Grange Power\CAD\Figure E.4.1.dwg Oct 2, :44AM hea38245 Scale at A0 Status Rev Security 1:200 APR Drawing Number P1 STD MMD N-DR-00-XX-0009

26 TABLE E.3(i): EMISSIONS TO SEWER Emission Point: SE-1 Emission Point Ref. N o : Location of connection to sewer: Grid Ref. (12 digit, 6E,6N): SE-1 (Foul) Grange Castle Business Park E, N Name of sewage undertaker: Emission Details: (i) Volume to be emitted Irish Water Normal/day N/A Maximum/day N/A Maximum rate/hour 15.1m 3 (ii) Period or periods during which emissions are made, or are to be made, including daily or seasonal variations (start-up /shutdown to be included): Periods of Emission (avg) 60 min/hr 24hr /day 365 day/yr 68

27 TABLE E.3(ii): EMISSIONS TO SEWER - Characteristics of the emission Emission point reference number: SE-1 Parameter Prior to treatment As discharged % Efficiency Max. hourly average (mg/l) Max. daily average (mg/l) kg/day kg/year Max. hourly average (mg/l) Max. daily average (mg/l) kg/day kg/year BOD Suspended Solids

28 TABLE E.3(i): EMISSIONS TO SEWER Emission Point: SE-2 Emission Point Ref. N o : Location of connection to sewer: SE-2 (Process Wastewater) Grange Castle Business Park Grid Ref. (12 digit, 6E,6N): Name of sewage undertaker: Emission Details: (i) Volume to be emitted E, N Irish Water Normal/day N/A Maximum/day N/A Maximum rate/hour 0.5m 3 (ii) Period or periods during which emissions are made, or are to be made, including daily or seasonal variations (start-up /shutdown to be included): Periods of Emission (avg) 60 min/hr 24hr /day 365 day/yr 70

29 TABLE E.3(ii): EMISSIONS TO SEWER - Characteristics of the emission Emission point reference number: SE-2 Parameter Prior to treatment As discharged % Efficiency Max. hourly average (mg/l) Max. daily average (mg/l) kg/day kg/year Max. hourly average (mg/l) Max. daily average (mg/l) kg/day kg/year ph BOD Suspended Solids Nitrate (as N) Ammonia (as N) Chloride Mineral Oil Total Phosphorus (as P)

30 E.5 Noise Emissions A noise impact assessment was undertaken as part of the planning application for the power plant to determine the noise levels being emitted to the surrounding environment from the power plant. More detailed information noise impact assessment is provided in Attachment I.7 Noise Impacts. As part of the impact assessment, a baseline noise monitoring survey was carried out. This survey concluded that the existing environment was not classified as a Quiet Area or an Area of Low Background Noise, as the average daytime LA 90 was not less than or equal to 40dB; the average evening time LA 90 was not less than or equal to 35dB; and the average night-time LA 90 was not less than or equal to 30dB. The existing noise environment was therefore considered to be elevated which, at the time of the survey, was characterised mostly by traffic, construction noise and industrial noise originating from within the Grange Castle Business Park. Noise impacts were predicted at nearby receptors using the CadnaA noise prediction program which calculates noise levels in accordance with ISO : Attenuation of Sound Propagation Outdoors: General Method of Calculation, International Organization for Standardisation (1996). This assessment took into consideration the existing baseline noise in the environment and assessed the potential impacts against nationally and internationally accepted criteria and noise limits. The noise prediction programme models the spreading of sound with distance, the absorption of sound by ground and air, the effects of topography and screening by buildings. The following assumptions were made when creating the noise model: The equipment comprising the power plant and its auxiliary machinery was modelled as a number of point sources located in space above the ground without any physical surfaces. This means that noise emissions would, in effect, be able to pass through the machinery. Such an approach is expected to be conservative and is considered to be a worst case scenario modelling exercise. The noisier elements of the plant are identified on Figure E.5.1 Noise Emissions and include: 2 no. engine exhaust stacks (N1 and N2) which incorporate 7 no. flue stacks in total; The engine hall (building) [N3] which includes the following noise sources: 7 no. Wärtsilä 50DF engines; 7 no. ventilation inlet room; 7 no. ventilation outlet fan; 42 no. cooling radiators. Table E.5 (i) provides more comprehensive information on the above noise emissions. It should be noted that the input data to the model for each noise source included: Noise source locations including height, directivity etc; Source Noise Emissions The A-weighted sound power levels for each source between frequencies 31.5Hz and 8kHz; 72

31 Working Hours The model allows the user to define daytime, evening time and night-time periods, so that noise levels can be predicted for each period. For the purposes of this assessment, in order to predict the maximum possible noise levels, all of the noise sources were assumed to run continuously during the day, evening and night-time. As the plant will not be operated continuously and will only be operated when there is a requirement for additional electricity in the grid, assuming a continuous operation is a very conservative approach. The model did however; assume different fan speeds for the different time periods of the day. Location of sensitive receptors; Ground Conditions The ground at the site and surroundings was assumed to be hard and reflecting. This gives a conservative approach as there are areas surrounding the site which consist of grassland which will absorb sound waves, thus reducing sound level from the proposed facility at the nearest sensitive receptors. Mitigation would typically comprise the following items: Design, procurement and installation of equipment to relevant industry standards (IS, EN etc.); Specification of maximum noise limit criteria for equipment in procurement contracts, including the absence of tonal/impulsive components in external equipment; Inspection and maintenance of equipment as part of preventive maintenance programme to ensure continued normal operation and minimise any noise issues occurring; Restricting any specific noisy activities which could impact on ambient noise levels (e.g. testing of equipment) to daytime hours only; Restricting deliveries/shipments to daytime hours only. Periodic noise monitoring in accordance with the site s Industrial Emissions Licence. Overall therefore, with appropriate mitigation, operational noise levels at nearby noise sensitive receptors would not exceed typical daytime, evening time and night time industrial emissions licence limit criteria and would not be expected to be significant. 73

32 P1 29/09/15 SHY For Planning MMcC PK T F W Notes 1. THIS DRAWING IS TO BE READ IN CONJUNCTION WITH ALL RELEVANT ARCHITECTS AND ENGINEERS DRAWINGS AND SPECIFICATIONS. 2. DO NOT SCALE, USE FIGURED DIMENSIONS ONLY. 3. ANY DISCREPANCIES TO BE REPORTED TO THE ARCHITECT. 4. ALL DIMENSIONS ARE IN MILLIMETERS. 5. ALL LEVELS ARE IN METRES RELATIVE TO ORDNANCE SURVEY DATUM MALIN HEAD. Key to symbols 0008 ENGINE HALL N ANCILLIARY TANKS, PLANT, EQUIPMENT AND BUILDINGS Reference drawings A ³ ³ A B B : m 25m Rev Date Drawn Description Ch k d App d Mott MacDonald South Block, Rockfield, Dundrum, Dublin 16, Ireland +353 (0) (0) Client Grange Back Up Power Ltd Title Figure E.5.1 Noise Emissions Designed Others Eng check Others Drawn S. Healy Coordination Dwg check M.McCarthy Approved P.Kellly Mott MacDonald This document is issued for the party which commissioned it and for specific purposes connected with the captioned project only. It should not be relied upon by any other party or used for any other purpose. We accept no responsibility for the consequences of this document being relied upon by any other party, or being used for any other purpose, or containing any error or omission which is due to an error or omission in data supplied to us by other parties. P:\Dublin\MPD\ Grange Power\CAD\Figure E.5.1.dwg Sep 30, :40PM hea38245 Scale at A0 Status Rev Security 1:200 APR Drawing Number P1 STD MMD N-DR-00-XX-0010

33 Table E.5(i): NOISE EMISSIONS - Noise sources summary sheet Source Exhaust Gas Stack 1 Exhaust Gas Stack 2 Engine hall (building) incorporating below: Engine (7 no.) Ventilation Room (7 no.) Ventilation Outlet (7 no.) 6 Fan Cooling Radiator (day) (7 no.) 6 Fan Cooling Radiator (evening/ night) (42 no.) Emission point Ref. No Equipment Ref. No Sound Pressure 1 dba at reference distance Octave bands (Hz) Sound Pressure 1 Levels db(unweighted) per band Impulsiv e or tonal qualities Periods of Emission K 2K 4K 8K N1 N/A N/A No Continuous N2 N/A N/A No Continuous N3 N/A N/A 115d(B) at No Continuous 1 metre N/A N/A No Continuous N/A N/A No Continuous N/A N/A No Continuous N/A N/A No Continuous 74