iel application sections a to m

Grange BackUp Power Industrial Emissions Licence Application

349512/EDE/DDX/1/A 20 October 2015

46

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’.

E. Emissions

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47

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 2000m3) 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.

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48

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 NOX is the Selective Catalytic Reduction

(SCR) technique. In the SCR system the NOX (NO and NO2) 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.

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P1 29/09/15 SHY For PlanningMMcC PK

Key to symbols

App’dCh’k’dDescriptionDrawnDateRev

RevStatus

Drawing Number

Scale at A0

Eng check

Approved

Coordination

Dwg check

Drawn

Designed

Title

Notes

Client

Reference drawings

Security

P:\Dublin\MPD\349512 - Grange Power\CAD\Figure E.1.1.dwg Sep 30, 2015 - 1:27PM hea38245

TFW

©

Figure E.1.1

Atmospheric Emissions Point

Grange Back Up Power Ltd

Others

S. Healy

M.McCarthy

Others

P.Kelly

1:200 APR

MMD-349512-N-DR-00-XX-0007

P1 STD

Mott MacDonald

South Block, Rockfield,

Dundrum, Dublin 16,

Ireland

+353 (0)1 2916700

+353 (0)1 2916747

www.mottmac.com

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.

Mott MacDonald

1:200

0 25m10m

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18

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7

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22

23

24

25

26

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.

ENGINE HALL

ANCILLIARY TANKS, PLANT, EQUIPMENT AND BUILDINGS

EMISSION POINT

28

29

30

31

32

33

34

1

22

22

22

22

22

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6

5

18

10

11

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25

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19

2423

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14

3

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15

2

14

17

³

³

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34

B

0008

A

0008

A

0008

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49 349512/EDE/DDX/1/A 20 October 2015


TABLE E.1(ii) MAIN EMISSIONS TO ATMOSPHERE

Emission Point Ref. No:

A2-1

Source of Emission:

Engine Operating on Natural Gas

Location:

Stack No.11

Grid Ref. (12 digit, 6E,6N):

303681 E, 232116 N

Vent Details

Diameter:

Height above Ground(m):

2.77 metres 25.0 metres

Date of commencement:

TBC

Characteristics of Emission:

(i) Volume to be emitted: 80 Nm3/s (dry)2

Average/day Nm3/d Maximum/day Nm3/d

Maximum rate/hour 288,000 Nm3/h

Min efflux velocity 3108 m.sec-1

(ii) Other factors

Temperature 405oC(max) 352oC(min) 373oC(avg)

For Combustion Sources: Volume terms expressed as : � wet. √dry. ________%O2

(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.

3 27 m/s per engine (100% engine load)

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50 349512/EDE/DDX/1/A 20 October 2015


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.

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51 349512/EDE/DDX/1/A 20 October 2015


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/Nm3 kg/h description mg/Nm3 kg/h. kg/year

Avg Max Avg Max of treatment Avg Max Avg Max Avg Max

NOx N/A N/A N/A N/A Selective catalytic

reduction

- 755 - - - -

SO2 N/A N/A N/A N/A SO2emissions minimised

when firing on natural gas

- 15 - - - -

CO2 N/A N/A N/A N/A Fuel Type - - - - - -

CO N/A N/A N/A N/A Combustion Control - 100 - - - -

Particulate Matter N/A N/A N/A N/A

Particulate matter

emissions minimised when

firing on natural gas

- 10 - - - -

1. Concentrations should be based on Normal conditions of temperature and pressure, (i.e. 0oC,101.3kPa). Wet/dry should be the same

as given in Table E.1(ii) unless clearly stated otherwise.

5 Calculated as NO2.

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52 349512/EDE/DDX/1/A 20 October 2015




A2-1

Source of Emission:

Engine Operating on Low Sulphur Distillate Oil6

Location:

Stack No.1


303681 E, 232116 N

Vent Details

Diameter:




TBC


(i) Volume to be emitted: 100 Nm3/s (dry)7



Min efflux velocity 8112m.sec-1

(ii) Other factors



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). 7 23-25 nm3/s (dry) for 1 no. engine which equates to 100 Nm

3/s (dry) for 4 no. engines.


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53 349512/EDE/DDX/1/A 20 October 2015



to be included):

Periods of Emission9

(avg)


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.

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Emission Point Reference Number: A2-1: Engine Operating on Low Sulphur Distillate Oil

10





reduction

- 2000 - - - -

SO2 N/A N/A N/A N/A Very Low Sulphur Fuel

(0.1%)

- 70 - - - -



Particulate Matter N/A N/A N/A N/A Fuel Type - 30 - - - -



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).

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55 349512/EDE/DDX/1/A 20 October 2015




A2-2

Source of Emission:

Engine Operating on Natural Gas

Location:

Stack No.211


303656 E, 232117N

Vent Details

Diameter:




TBC


(i) Volume to be emitted: 60 nm3/s (dry)12




(ii) Other factors




to be included):

11

Stack No.2 will have 3 engines in the cluster. 12

20 nm3/s (dry) for 1 no. engine which equates to 60 Nm3/s (dry) for 3 no. engines.


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Periods of Emission 14

(avg)


14

14

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.

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Emission Point Reference Number: A2-2: Engine Operating on Natural Gas





reduction

- 7515 - - - -

SO2 N/A N/A N/A N/A SO2 emissions minimised

when firing on natural gas

- 15 - - - -



Particulate Matter N/A N/A N/A N/A

Particulate matter

emissions minimised when

firing on natural gas

- 10 - - - -



15

Calculated as NO2.

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58 349512/EDE/DDX/1/A 20 October 2015




A2-2

Source of Emission:

Engine Operating on Low Sulphur Distillate Oil16

Location:

Stack No.2


303656 E, 232117 N

Vent Details

Diameter:




TBC


(i) Volume to be emitted: 75 nm3/s (dry)17




(ii) Other factors



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).

17 23-25 nm3/s (dry) for 1 no. one engine which equates to 75 nm

3/s (dry) for 3 no. engines


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59 349512/EDE/DDX/1/A 20 October 2015



to be included):

Periods of Emission (avg)

19


19

19

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.

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60 349512/EDE/DDX/1/A 20 October 2015



Emission Point Reference Number: A2-2: Engine Operating on Low Sulphur Distillate Oil

20





reduction

- 2000 - - - -

SO2 N/A N/A N/A N/A Very Low Sulphur Fuel

(0.1%)

- 70 - - - -



Particulate Matter N/A N/A N/A N/A Fuel Type - 30 - - - -



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).

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61

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].

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62

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).

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Key to symbols


RevStatus

Drawing Number

Scale at A0

Eng check

Approved

Coordination

Dwg check

Drawn

Designed

Title

Notes

Client

Reference drawings

Security

P:\Dublin\MPD\349512 - Grange Power\CAD\Figure E.3.1.dwg Oct 2, 2015 - 8:42AM hea38245

TFW

©

Figure E.3.1

Emissions to Surface Waters


Others

S. Healy

M.McCarthy

Others

P.Kelly

1:200 APR

MMD-349512-N-DR-00-XX-0008

P1 STD

Mott MacDonald


Dundrum, Dublin 16,

Ireland

+353 (0)1 2916700

+353 (0)1 2916747

www.mottmac.com



Mott MacDonald

1:200

0 25m10m

1

2

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5

6

8

9

10

11

13

16

17

18

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7

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21

15

22

23

24

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AND SPECIFICATIONS.



ARCHITECT.




28

29

30

31

32

33

ENGINE HALL


EMISSION POINT

1

22

22

22

22

22

22

6

5

18

10

11

16

8

9

4

19

25

17

19

2423

21

26

14

3

7

20

15

2

14

17

³

³

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B

0008

A

0008

A

0008

A

0008

A

0008

B

0008

0008

N

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63 349512/EDE/DDX/1/A 20 October 2015


TABLE E.2(i): EMISSIONS TO SURFACE WATERS

Emission Point: SW1

Emission Point Ref. No: SW-1

Source of Emission: Surface Water Run-off

Location of discharge : Grange Castle Business Park

Grid Ref. (12 digit, 6E,6N): 303696E, 232052N

Name of receiving waters and

water body code: Irish Water Surface Water Drainage System prior to discharge to the attenuation pond to the north east of the Business Park

Flow rate in receiving waters: N/A

Available assimilative

capacity:

N/A

Emission Details:

(i) Volume to be emitted

Normal/day N/A Maximum/day N/A

Maximum rate/hour 13.68 m3

(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)21


21

Subject to rainfall.

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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

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TABLE E.2(i): EMISSIONS TO SURFACE WATERS

Emission Point: SW2

Emission Point Ref. No: SW-2

Source of Emission: Surface Water Run-off

Location of discharge : Grange Castle Business Park


Name of receiving waters and

water body code: Irish Water Surface Water Drainage System prior to discharge to the attenuation pond to the north east of the Business Park

Flow rate in receiving waters: N/A

Available assimilative

capacity:

N/A

Emission Details:



Maximum rate/hour 13.68 m3


to be included):

Periods of Emission (avg)22


22

Subject to rainfall.

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66 349512/EDE/DDX/1/A 20 October 2015


TABLE E.2(ii): EMISSIONS TO SURFACE WATERS - Characteristics of the emission

Emission point reference number: SW2


Max.

hourly

average

(mg/l)

Max. daily

average

(mg/l)


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

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67

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 0.5m3/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).

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Key to symbols


RevStatus

Drawing Number

Scale at A0

Eng check

Approved

Coordination

Dwg check

Drawn

Designed

Title

Notes

Client

Reference drawings

Security

P:\Dublin\MPD\349512 - Grange Power\CAD\Figure E.4.1.dwg Oct 2, 2015 - 8:44AM hea38245

TFW

©

Figure E.4.1

Emissions to Sewer


Others

S. Healy

M.McCarthy

Others

P.Kelly

1:200 APR

MMD-349512-N-DR-00-XX-0009

P1 STD

Mott MacDonald


Dundrum, Dublin 16,

Ireland

+353 (0)1 2916700

+353 (0)1 2916747

www.mottmac.com



Mott MacDonald

1:200

0 25m10m

1

2

3

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5

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10

11

13

16

17

18

19

20

7

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15

22

23

24

25

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AND SPECIFICATIONS.



ARCHITECT.




28

29

30

31

32

33

34

ENGINE HALL


EMISSION POINT

1

22

22

22

22

22

22

6

5

18

10

11

16

8

9

4

19

25

17

19

2423

21

26

14

3

7

20

15

2

14

17

33

34

B

0008

A

0008

A

0008

A

0008

A

0008

B

0008

0008

N

26

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68 349512/EDE/DDX/1/A 20 October 2015


TABLE E.3(i): EMISSIONS TO SEWER − Emission Point: SE-1

Emission Point Ref. No: SE-1 (Foul)

Location of connection to sewer: Grange Castle Business Park


Name of sewage undertaker: Irish Water

Emission Details:



Maximum rate/hour 15.1m3


to be included):

Periods of Emission

(avg)

60 min/hr 24hr /day 365 day/yr

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69 349512/EDE/DDX/1/A 20 October 2015


TABLE E.3(ii): EMISSIONS TO SEWER - Characteristics of the emission

Emission point reference number: SE-1


Max.

hourly

average

(mg/l)

Max. daily

average

(mg/l)


average (mg/l)

Max. daily

average (mg/l)

kg/day kg/year

BOD - - - - - 20 - - -

Suspended Solids - - - - - 30 - - -

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70 349512/EDE/DDX/1/A 20 October 2015


TABLE E.3(i): EMISSIONS TO SEWER − Emission Point: SE-2

Emission Point Ref. No: SE-2 (Process Wastewater)

Location of connection to sewer: Grange Castle Business Park


Name of sewage undertaker: Irish Water

Emission Details:



Maximum rate/hour 0.5m3


to be included):

Periods of Emission

(avg)

60 min/hr 24hr /day 365 day/yr

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tion p

urpo

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71 349512/EDE/DDX/1/A 20 October 2015


TABLE E.3(ii): EMISSIONS TO SEWER - Characteristics of the emission

Emission point reference number: SE-2


Max.

hourly

average

(mg/l)

Max. daily

average

(mg/l)


average (mg/l)

Max. daily

average (mg/l)

kg/day kg/year

pH - - - - - 6-9 - - -

BOD - - - - - 25 - - -

Suspended Solids - - - - - 35 - - -

Nitrate (as N) - - - - - 10 - - -

Ammonia (as N) - - - - - 5 - - -

Chloride - - - - - 350 - - -

Mineral Oil - - - - - 20 - - -

Total Phosphorus (as P) - - - - - 2 - - -

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72

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 LA90 was not less than or equal to 40dB; the average evening

time LA90 was not less than or equal to 35dB; and the average night-time LA90 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 9613-2: 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;

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73

� 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.

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Key to symbols


RevStatus

Drawing Number

Scale at A0

Eng check

Approved

Coordination

Dwg check

Drawn

Designed

Title

Notes

Client

Reference drawings

Security

P:\Dublin\MPD\349512 - Grange Power\CAD\Figure E.5.1.dwg Sep 30, 2015 - 12:40PM hea38245

TFW

©

Figure E.5.1

Noise Emissions


Others

S. Healy

M.McCarthy

Others

P.Kellly

1:200 APR

MMD-349512-N-DR-00-XX-0010

P1 STD

Mott MacDonald


Dundrum, Dublin 16,

Ireland

+353 (0)1 2916700

+353 (0)1 2916747

www.mottmac.com



Mott MacDonald

1:200

0 25m10m

1

2

3

4

5

6

8

9

10

11

13

16

17

18

19

20

7

14

21

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22

23

24

25

26



AND SPECIFICATIONS.



ARCHITECT.




ENGINE HALL


28

29

30

31

32

33

34

1

22

22

22

22

22

22

6

5

18

10

11

16

8

9

4

19

25

19

2423

21

26

14

3

7

20

15

2

14

17

³

³

33

34

B

0008

A

0008

A

0008

A

0008

A

0008

B

0008

0008

N

26

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74 349512/EDE/DDX/1/A 20 October 2015


Table E.5(i): NOISE EMISSIONS - Noise sources summary sheet

Source

Emission

point

Ref. No

Equipment

Ref. No

Sound

Pressure1

dBA at

reference

distance

Octave bands (Hz)

Sound Pressure1 Levels dB(unweighted) per band Impulsiv

e or

tonal

qualities

Periods of

Emission2

31.5 63 125 250 500 1K 2K 4K 8K

Exhaust Gas Stack 1

N1 N/A N/A 143 140 133 129 123 122 131 135 - No Continuous

Exhaust Gas Stack 2

N2 N/A N/A 143 140 133 129 123 122 131 135 - No Continuous

Engine hall (building) – incorporating below:

N3 N/A

Engine

(7 no.)

N/A 115d(B) at

1 metre

117 123 121 122 124 123 125 125 119 No Continuous

Ventilation Room

(7 no.)

N/A N/A - 109 105 109 108 107 107 107 103 No Continuous

Ventilation Outlet

(7 no.)


6 Fan Cooling

Radiator (day)

(7 no.)

N/A N/A 88 88 86 86 83 76 69 68 No Continuous

6 Fan Cooling

Radiator

(evening / night)

(42 no.)


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