Attachment E · the gas utilisation engines will exhaust through a 28m stack, the flare will exhaust through an 8m stack and the odour control system through a 25m stack. In terms

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Attachment E

EMISSIONS

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ATTACHMENT NO E EMISSIONS

CONTENTS ATTACHMENT E.1 – EMISSIONS TO ATMOSPHERE............................................ E-1

Point Emissions to Atmosphere..............................................................................E-2

Fugitive and Potential Emissions........................................................................... E-5

ATTACHMENT E.2 – EMISSIONS TO SURFACE WATER...................................... E-7

Summary List of Emission Points........................................................................... E-7

Surface Water Philosophy...................................................................................... E-8

ATTACHMENT E.3 - EMISSIONS TO SEWER......................................................... E-9

Summary List of Emission Points........................................................................... E-9

ATTACHMENT E.4 – EMISSIONS TO GROUND................................................... E-11

ATTACHMENT E.5 – NOISE EMISSIONS.............................................................. E-12

ATTACHMENT E.6 – TABULAR DATA ON EMISSION POINTS............................E-16

FIGURES................................................................................................................. E-18

TABLES

Table E.1 Scheduled Emission Points to Atmosphere Source Characteristics......... E-3

Table E.2 Operational External Fixed Plant Noise Sources.....................................E-14

Table E.3 Tabular Data on Emission Points............................................................ E-16

FIGURES

Figure E.1 Location of Emissions to Atmosphere, Surface Water & Sewer.............E-18

Figure E.2 Operational Noise Source Locations................................................. E-18

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Proposed Renewable Bioenergy Plant E-1 Stream BioEnergy Ltd. Huntstown, North Road, Finglas, Dublin11

ATTACHMENT E.1 - EMISSIONS TO ATMOSPHERE An Air Quality assessment undertaken by Odour Monitoring Ireland is included as

Chapter 8 of the EIS (Volume II). The assessment describes the potential impacts to

ambient air quality from the Huntstown Renewable Bioenergy plant. A worst case of

assessment was utilised throughout the study in order to assess any risk associated

with the operation of the plant. Particular attention is given to the potential exposure of

receptors to airborne pollutants resulting from the development and operation of the

plant. Sensitive receptors, including local business units and residential dwellings

within circa 1 kilometre (km) of the subject site and designated ecological sites up to

15 km have been included in the assessment.

The assessment has been carried out in line with all relevant guidelines. In terms of

odour, the EPA’s Air Dispersion Modelling from Industrial Installations Guidance Note

(AG4) was taken into account. This document was used to assess whether the plant

is likely to give rise to odour impact at identified sensitive receptors.

The air modelling study (using AERMOD Prime) demonstrates that emission levels as

a result of the operation of the plant will not result in any air quality impact in line with

Irish and European assessment criteria limits. The air quality emissions from each of

the gas utilisation engines will exhaust through a 28m stack, the flare will exhaust

through an 8m stack and the odour control system through a 25m stack.

In terms of odour, Huntstown Power Station (immediately north of the site), is

identified as the worst case receptor with a maximum predicted ground level

concentration (GLC) of odour less than or equal to 0.88 OuE/m3 at the 98th percentile

of hourly averages for the worst case meteorological year Dublin 2004. This is just

58% of the odour impact criterion of 1.5 OuE/m3 stated in Agency’s Guidance AG4

(page 70).

In addition, the maximum predicted odour concentration anywhere in the vicinity of the

plant (including inside and outside the boundary of the facility and within the fine grid

area of 4.0 km sq and 36 km sq and a course grid area of 361 km sq) will be less than

or equal to 1.0 OuE/m3 for the 98th percentile of hourly averages for the worst case

meteorological year Dublin Airport 2004. This is 66% of the worst case odour impact

criterion of 1.5 OuE/m3 stated Agency’s Guidance AG4 (page 70).

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Fugitive emissions of odours will be negligible as all buildings and processes

containing odorous activities will be of high containment integrity (near 100% integrity)

and all areas where odorous activities occur will be placed under negative extraction.

The Air Quality and Climate assessment demonstrates that the controls built into the

facility mean that emissions to air from the plant will have no significant adverse

effects on air quality. All predicted ground level concentrations (GLCs) at or beyond

the facility boundary will be in compliance with air quality limit values for both the

protection of human health and flora and fauna.

Point Emissions to Atmosphere

Summary List of Emission Points The plant will have three primary point source emissions as follows:

• A2-1: a single multi-flue stack which will discharge the residual levels of

pollutants from 2 x 2MW combined heat and power (CHP) engines and the

standby boiler to atmosphere at a height of 28m above ground level;

• A2-3: a standby gas flare which can be used to combust excess biogas when

combustion by the CHP or storage in the gas holder is unavailable;

• A2-4: odour control stack through which treated air from the odour control

system will be vented for dispersion to atmosphere at a height of 25m above

ground level.

The locations of the proposed scheduled emission points are presented on Figure E.1

at the end of this attachment. The grid reference for each is:

• A2-1: E311445, N241219

• A2-3: E311480, N241202

• A2-4: E311336, N241266

It should be noted by the Agency that Chapter 8 of the EIS refers to emission point

A2-2; this is captured in A2-1 as it is a single multi-flue stack and is therefore not

referenced in this Industrial Emissions License (IEL) application.

Plans of each of these emission points are included as the following drawings within

the Planning Drawings which accompany this application:

• PL27 – Odour Control System and Stack

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• PL29 – Flare Stack

• PL30 – CHP Engine Containers and Stack

Further details of each of the three scheduled emission points are provided in Table

E.1 below including, emission point location, height, stack tip diameter, efflux velocity,

exhaust actual airflow volume, worst case building / structure height etc.

Table E.1 Scheduled Emission Points to Atmosphere Source Characteristics

Parameter Emission point

A2-1 (multi-flue stack)

Emission point A2-3

Emission point A2-4

Emission point description Gas Engines 1 & 2 combined

Flare Odour Control

Stack

X coordinate (m) 311445 311480 311336

Y coordinate (m) 241219 241202 241266

Stack height (m) 28 8 25

Stack tip diameter (m) 0.7 2.80 1.5

Volume flow (Am3/hr) 22,667 210,835 110,000

Flue gas temperature (K) 423 1273 293

Efflux velocity (m/s) 16.36 9.51 17.29

Stack orientation Vertical Vertical Vertical

Stack base level A.O.D (m) 77 77 77

Receptor height (normal breathing level) (m)

1.80 1.80 1.80

Max building / tank height (m) 25.42 25.42 25.42

Building base level A.O.D (m) 77 77 77

All pollutants likely to be emitted from the named emission points A2-1, A2-3 and A2-4

were taken account of in the impact assessment and include the following compounds

as listed in the Environmental Protection Agency (Industrial Emissions) (Licensing)

Regulations 2013 S.I. 137 of 2013:

• Carbon monoxide

• Oxides of nitrogen

• Sulphur dioxide

• Total particulates

• Total non-methane volatile organic compounds.

In addition to the compounds listed above, the following were also assessed:

• Odour units, and

• Ammonia

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Tables 8-18, 8-19, 8-20 and 8-25 contained within Chapter 8 of the EIS (Volume II)

should be referenced for further supporting information on each emission point.

These Tables outline the air phase gas concentration and mass emission rate of each

pollutant assessed within the dispersion model. Sections 8.97 to 8.138 of the

assessment reports on the modelling performed.

Tables The following Tables have been completed and are presented in the main application

form:

• Table E.1 (i) for boiler emissions (A2-1)

• Table E.1 (ii) for combined boiler and gas utilisation stack emissions (A2-1)

• Table E.1 (ii) for biogas flare emissions (A2-3), and

• Table E.1 (ii) for odour control stack emissions (A2-4), and

• Table E.1 (iii) for emissions points A2-1, A2-3 and A2-4

It was not considered necessary to complete Table E.1 (iv) for minor emission points

or E.1 (v) for fugitive and potential emissions. A number of measures, as outlined in

the Fugitive and Potential Emissions section below, are incorporated into the design

to ensure that fugitive emissions of odours are minimised from the plant.

Odour Abatement All odorous air will be vented through a three stage odour treatment process

comprising a biotrickling filter, plasma injection treatment and carbon polishing to

deodorise the collected air. Treated air will be vented through a 25m stack to provide

further dispersion as a final protection.

The overall system will be capable of achieving an exhaust odour threshold

concentration of less than 1,000 OuE/m3 with a typical value in the exhaust stream of

700 OuE/m3.

A comprehensive description and schematic of the odour control system are

presented in Attachment F.1 of this application.

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Fugitive and Potential Emissions It was not considered necessary to complete Table E.1 (v) for fugitive and potential

emission points. There will be no fugitive emissions to atmosphere due to mitigation

measures incorporated into the design of the plant as outlined below.

Odour Emissions Potential impacts associated with odours have been considered within the Air Quality

and Climate Assessment. Measures incorporated into the design of the plant will

ensure that there are no fugitive emissions of odours to atmosphere, they include:

• All waste handling and pre-treatment activities will be carried out indoors at the

facility;

• All buildings and processes containing odorous activities will be of high

containment integrity (near 100% integrity);

• Extraction systems in the reception area of the main building will maintain

negative pressure inside all areas where waste is handled and processed.

This will encourage air to flow into the building, thus further preventing

uncontrolled egress of odour;

• All external process features, such as pipework and tanks, will be enclosed and

sealed, with negative extraction applied to ensure no fugitive emissions of odours

during operation;

• The waste intake buildings will be fitted with rapid roller doors which will be

interlocked and fitted with air curtains so as to maintain good building integrity in

terms of odour containment (main access doors only) when doors are opened

intermittently during delivery of feedstock;

• Pedestrian doors will remain closed and only open when access is required.

This will ensure the risk of egress of odour through building apertures is

minimised;

• All odorous air will be vented through a three stage odour treatment process to

deodorise the collected air. In addition, this treated air will be vented through a

25m stack to provide further dispersion as a final protection;

• There will be no emissions to atmosphere from the digestion tanks or other

process vessels containing odorous materials as waste will be contained

within fully sealed tanks; and

• The combustion of biogas by the CHP units or gas flare will destroy any

potentially odorous compounds contained in the biogas. The proposed design

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of a 28m high stack is considered to represent a good level of environmental

performance, to ensure adequate dispersion.

Dust The process has been designed to control emissions of dust. Waste will be delivered

and pre-treated entirely in an enclosed building maintained under sub-atmospheric

pressures to contain, collect and treat dust and particles. The Air Quality assessment

demonstrates that dust and particulate emissions will not be significant during the

operational phase.

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ATTACHMENT E.2 - EMISSIONS TO SURFACE WATER A hydrological assessment undertaken by SLR Consulting Ltd. is included as Chapter

13 of the EIS (Volume II). The assessment describes the potential impacts to surface

water from the plant.

The report is based on a desk study review of published hydrological data for the

area, a review of previous hydrological investigations carried out at the Huntstown

Quarry complex, and a site walkover.

The site lies within the catchment of the Ballystrahan Stream which is a sub-

catchment of the Ward River to the north. All treated excess surface water runoff from

the site will drain from the existing quarry drainage network north to the Ballystrahan

Stream, which drains downstream to the Ward River and ultimately to the Irish Sea at

Swords.

The water quality in the Ballystrahan Stream is classified as ‘good’ however water

quality in the Ward River is ‘poor’, mainly due to diffuse agricultural pollution and

dredging. Drainage in the Ballystrahan Stream and Ward River has been augmented

by an Arterial Drainage Scheme implemented in the 1960s, with ongoing maintenance

by the Office of Public Works (OPW).

The combined discharge of treated water from Huntstown Quarry and Huntstown

Power Station is discharged to the Ballystrahan Stream under licence at the northern

boundary of the quarry site.

The site is not located in a flood prone area, however preliminary flood risk

assessment mapping by the OPW suggests that there could be some pluvial (rainfall)

flooding at the site in an extreme event. Mitigation measures have been proposed to

address the potential impacts and the residual impact of the proposed development

on the surface water environment is expected to be ‘imperceptible’.

Summary List of Emission Points There will be one point source emission to surface water (SW1) from the plant,

located at E-311412, N-241300. Only treated excess storm water runoff will be

discharged from this point to the existing quarry drainage network. It is estimated that

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an average of approximately 12m3 per month of clean runoff will be discharged after

rainfall harvesting.

The location of the discharge point together with an outline of the surface water

drainage system is presented on Drawing PL37. Typical details for various elements

of the surface water drainage system are provided on Drawing PL38. All drawings

are located within the Planning Drawings which accompany this application.

Details of the characteristics of the surface water emissions are presented in Tables

E.2(i) and E.2(ii) of the main application form.

There will be no emissions of substances listed in the Schedule of EPA (Industrial

Emissions) (Licensing) Regulations 2013 S.I. No. 137 of 2013.

Surface Water Philosophy The surface water drainage system has been designed to discharge excess runoff

into the existing storm water open ditch to the north of the existing main access road.

It is estimated that an average of approximately 12m3 per month of clean runoff will be

discharged after rainfall harvesting.

A comprehensive description of the surface water philosophy and schematic are

presented in Attachment F.1 of this application.

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ATTACHMENT E.3 - EMISSIONS TO SEWER This section should be read in conjunction with Chapter 2 (Sections 2.62-2.71) of the

EIS (Volume II) and Appendix 13-3 (Section 2.4) of the EIS (Volume III) which

present details of the foul water drainage philosophy for the site.

Summary List of Emission Points There will be one point source emission to sewer (SE1) at E-311319, N-241278. It is

estimated that up to 200m3/day of treated process effluent will be discharged to the

sewer.

The discharge will not contain any List I substances as defined in the Annex to EU

Directive 2006/11/EC (as amended) but List II compounds may be present in trace

amounts.

The location of the discharge point at the south western boundary of the site together

with the foul sewer drainage layout plan is presented on Drawing PL39. Typical

details for various elements of the foul sewer drainage system are provided on

Drawing PL40. All drawings are located within the Planning Drawings which

accompany this application.

Details of the characteristics of the sewer emission point are presented in Tables

E.3(i) and E.3(ii) of the main application form.

Effluent Treatment System The plant incorporates an on-site Wastewater Treatment Plant (WwTP) (see Drawings

PL17-20), comprising the following elements:

• 1 no. process liquor tank which will acts as a storage facility for liquid

digestate from the centrifuge.

• 3 no. sequential batch reactor in which the biological process of removing

Biological Oxygen Demand (BOD) and ammonium takes place.

• 1 no. sludge tank for holding sludge recovered from the WwTP.

• 1 no. process water tank to hold process effluent to be recycled back to the

AD process or discharged to sewer.

• 1 no. pumping station for pumping treated process effluent to the mains

sewer.

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Treatment Process This facility will treat separated liquid digestate from the centrifuge (water fraction)

stage of the AD process. Process water discharged from the wheelwashes and

vehicle wash will also be diverted to the onsite WwTP. However, it should be noted

that runoff from the washing of the main building floor will be captured and recycled

directly to the AD process. Wastewater effluent from the welfare facilities will be

discharged directly to the public sewer.

The treated process water from the WwTP is recycled into the main process and is

used to dilute the incoming feedstock. Excess treated process water that is not

required for the process will be discharged to the municipal sewer. It is estimated that

up to 200m3/day of treated process effluent will be discharged to the sewer. This

effluent will have a significantly reduced organic loading following the treatment in the

on-site WwTP, with a maximum population equivalent of approximately 750 (based on

1 PE = 54g of BOD per day).

Receiving Sewer Due to the low surface gradient and relatively flat nature of the topography, a

packaged pumped system with two standby pumps will be installed. A foul water

rising main of 100mm diameter will be constructed that will connect the plant with the

municipal sewer network at a point located on North Road (see Drawing PL39). The

rising main will extend to an outfall chamber to be located on the eastern side of the

North Road. From this point south, the foul water sewer line will change to a gravity

fed system and discharge into the existing foul water manhole. The distance from the

foul water discharge point on site to the existing manhole on the eastern side of the

North Road is approximately 1000m.

Effluent from the municipal sewer will ultimately be treated at the Ringsend WwTP

prior to discharge to the Irish Sea.

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ATTACHMENT E.4 - EMISSIONS TO GROUND There will be no direct discharge to ground from the plant. The plant will be

constructed on an impermeable surface with the main process tanks contained within

bunded areas with the capacity to store 110% of the content of the largest tank.

Mitigation measures contained within Chapter 12, Soils and Geology and Chapter

14, Hydrogeology of the EIS (Volume II) will ensure that there are no emissions to

ground.

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ATTACHMENT E.5 - NOISE EMISSIONS A Noise Impact Assessment undertaken by SLR Consulting Ltd. is included as

Chapter 10 of the EIS (Volume II). This section should be read in conjunction with

the assessment which considers the impact of the noise generated during both the

construction and normal operational phases of the plant on the nearest noise sensitive

locations (NSL’s).

The methodology for the noise assessment has been undertaken in accordance with:

• BS5228-1:2009 ‘Code of practice for noise and vibration control on

construction and open sites – Part 1: Noise’, and

• ‘Guidance Note for Noise: Licence Applications, Surveys and Assessments in

Relation to Scheduled Activities (NG4)’ published by the Environmental

Protection Agency (EPA) Office of Environmental Enforcement (OEE), 2012.

As detailed design engineering has not yet been undertaken, it should be noted by the

Agency that the provision of noise data in frequency bands is not available for this

assessment. In the absence of frequency level data this assessment uses sound

power levels, with a plus 5dB(A) tonal or impulsive adjustment added to each noise

source within the noise model to provide for the worst case scenario as provided for

in the EPA’s NG4 Guidance.

Noise predictions have been made using the noise software modelling program

Cadna-A. This program takes into account the distance between the sources and the

receptors, and the amount of attenuation due to atmospheric absorption. The

program assumes downwind propagation, and for this assessment it has been

assumed that the ground between the source and the receiver has an absorbency

value of 0.5.

Noise monitoring was undertaken at six monitoring locations which included four

NSL’s; a location at the boundary of the site and a location within the site. This

baseline monitoring establishes that the study area can be designated as ‘not an area

of low background noise’ in accordance with the standards set out in NG4.

The modelling undertaken as part of the assessment demonstrates that the NG4

noise criterion limits as prescribed for daytime, evening, and night-time are

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comfortably met at all four NSL’s (Locations 1-4) and at Location 6, the site boundary

location. The construction noise assessment demonstrates that noise generated by

worst-case construction operations are within the specified limits at all of the locations

assessed.

Summary List of Emission Points The operational external fixed plant noise sources associated with the plant are

described in Table E.2 below with further details presented in Table E.5 (i) contained

within the main application Form. The location of emission points are provided on the

Figure E.2 at the end of this attachment.

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Renewable Bioenergy Plant E-14 Stream BioEnergy Ltd. Huntstown, North Road, Finglas, Dublin11

Table E.2 Operational External Fixed Plant Noise Sources

Noise Source Number Plant Description

N1 & N2 2 x 2MW CHP Engines Gas engine fuelled by the biogas from the process. Generating renewable electricity for export to the national grid and heat for use in the process.

N2 28m CHP Stack

The CHP engines will discharge the residual levels of pollutants to atmosphere from a single multi-flue stack at a height of 28m above ground level.

N3 Biogas Flare

A standby gas flare which can be used to combust excess biogas when combustion by the CHP or storage in the gas holder is unavailable

N4 & N5 2 x Gas Boosters

Rotary machine which boosts the gas pressure to the required level for supply to the engines.

N6, N7 & N8 Positive Displacement Pumps Pumps used for pumping organic slurry from one tank to another.

N9 Odour Control Fan Centrifugal fan used to create the pressure drop to move air from the sources of odour to the odour treatment plant.

N10, N11, N12 & N13 4 x Digester Mixer Large big blade mixer, with an external gear box and electric motor.

N14 & N15 2 x Pasteuriser Mixer Mixer mounted on pasteuriser vessel to keep contents of pasteuriser tanks mixed.

N16 Standby Boiler Standby boiler used during commissioning and maintenance to provide heat to the digesters when the CHP engines are not running.

N17 Emergency Generator Packaged standby emergency generator. Provides electricity in the event of a power cut.

N18 SBR Blowers Rotary machine (Roots Type Blower) which takes ambient air and pressurises it sufficiently to be able to flow into the SBR tanks.

N20 to N25 Waste Pre-treatment

Stage 1 Supplier Dependant. Typically shredding, macerating, hammer mill, rotary chain. To break up the packaging.

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Stage 2 Supplier Dependant. Typically removing packaging through a screen/press.


Stage 3 Supplier Dependant. Typically conditioning the waste prior to mixing. i.e. mixing, straining or pressing.

N26 & N27 2 x Biomass Mixer Supplier Dependant. Typically a large mixing blade on top of a vessel to which water/slurry/liquid wastes are added and mixed.

N28 & N29 2 x Centrifuge Dewatering High speed machine which separate water and solids using gravity generated in the rotating machine. Solids are ejected by a screw within the machine.

N30, N31 & N32 3 x Centrifugal Pumps Used to pump water between tanks.

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ATTACHMENT E.6 - TABLULAR DATA ON EMISSION POINTS Please also see separate CD-Rom included with this application entitled IED Licence

Application Sections B.2, E.6 and F.3 which contains section E.6 in excel as required

by the Agency.

Table E.3 Tabular Data on Emission Points

Point Code Point Type Easting Northing Verified Emission

A2-1 A 311445 241219 N

CO, NO2, SO2, PM10, PM2.5, Total non methane, Volatile organic compounds,

NH3

A2-3 A 311480 241202 N

CO, NO2, SO2, PM10, PM2.5, Total non methane, Volatile organic compounds,

NH3

A2-4 A 311336 241266 N NH3

SW1 SW 311412 241300 N Treated storm water

SE1 SE 311319 241278 N BOD, COD, NH4, Suspended Solids, pH

N1 N 311445.438 241224.770 N dB(A)

N2 N 311449.564 241233.715 N dB(A)

N3 N 311428.464 241227.008 N dB(A)

N4 N 311443.746 241246.800 N dB(A)

N5 N 311442.732 241245.814 N dB(A)

N6 N 311457.154 241275.621 N dB(A)

N7 N 311502.850 241252.974 N dB(A)

N8 N 311474.071 241269.383 N dB(A)

N9 N 311339.170 241279.275 N dB(A)

N10 N 311497.018 241265.059 N dB(A)

N11 N 311513.921 241257.820 N dB(A)

N12 N 311488.779 241248.170 N dB(A)

N13 N 311505.668 241239.930 N dB(A)

N14 N 311461.294 241285.566 N dB(A)

N15 N 311454.069 241269.662 N dB(A)

N16 N 311446.788 241249.758 N dB(A)

N17 N 311388.909 241259.572 N dB(A)

N18 N 311328.743 241320.434 N dB(A)

N20 N

311391.175 241278.546

N dB(A)

N21 N N dB(A)

N22 N N dB(A)

N23 N N dB(A)

N24 N N dB(A)

N25 N N dB(A)

N26 N 311391.175 241278.546

N dB(A)

N27 N N dB(A)

N28 N 311357.130 241276.023 N dB(A)

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N29 N 311362.088 241272.952 N dB(A)

N30 N 311319.911 241332.561 N dB(A)

N31 N 311327.038 241341.464 N dB(A)

N32 N 311322.163 241350.535 N dB(A)

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FIGURES

Figure E.1 Location of Emissions to Atmosphere, Surface Water & Sewer

Figure E.2 Operational Noise Source Locations

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4446

34

27

33

1

4

13

10

2

3

29

28

43

45

17

9

23

22

363738

3940

41

42

35

47

49

48

50

14

+78.000

+78.000

+79.335

1516

Site Layout and Proposed Emission and Sampling LocationsScale 1:1000 / A3

N

W

S

E

31 Rainey Street, Magherafelt, BT45 [email protected] www.visiondesign.org.uk

Tel: 028 7930 0866

NOTES

Scale Date

1. BASED ON 1:1000 & 1:2500 ORDNANCE SURVEY IRELANDDIGITAL MAPPING - MAP NO's. - 3063A, 3063C, 3062B, 3062C, 3062D,3130A, 3130B, 3131-01 & 3131-06

2. ORDNANCE SURVEY IRELAND LICENCE NO. AR 0116513 (C)ORDNANCE SURVEY & GOVERNMENT OF IRELAND

3. © COPYRIGHT RESTS WITH VISION DESIGNTHIS DRAWING MAY NOT BE REPRODUCED WHOLLY OR IN PARTWITHOUT THE EXPRESS WRITTEN PERMISSION OF VISION DESIGN

LEGEND

Revision Drawn By Chkd By Date Comments

CLIENT:

16.06.14RD RD-

Renewable Bioenergy PlantProposed Huntstown

Finglas, Dublin 11Huntstown, North Road,

Emission and Sampling Locations

Title - Site Layout and Proposed

June 20141:1000 / A3

2388 - Figure E.1

Huntstown Renewable BioEnergy PlantApplication Area (c 2.382 ha)

Existing wayleave for 220 kv cable to HuntstownPower Station

Proposed new sewer line from pumping station

KEY TO BUILDINGS AND PLANT

Proposed emission and sampling locations

Emission Ref Easting NorthingA2-1 (Combinedemission point)

311445 241219

A2-3 311480 241202A2-4 311336 241266SW1 311412 241300SE1 311319 241278

EMISSION REFERENCE TABLE

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PAST.

PAST.

TO301PREPAST


Tel: 028 7930 0866

NOTES

Scale Date




LEGEND


CLIENT:

16.06.14RD RD-



Operational Noise Source Locations

Title: Site Layout and Location of

June 20141:1000 / A3

2388 - Figure E.2

N

W

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E

Location of operational fixed plant noise sources(see table E.2 for descriptions)N21

Point Source Reference Table

Point CodePointType Easting Northing

N1 N 311445 241225

N2 N 311450 241234

N3 N 311428 241227

N4 N 311444 241247

N5 N 311443 241246

N6 N 311457 241276

N7 N 311503 241253

N8 N 311474 241269

N9 N 311339 241279

N10 N 311497 241265

N11 N 311514 241258

N12 N 311489 241248

N13 N 311506 241240

N14 N 311461 241286

N15 N 311454 241270

N16 N 311447 241250

N17 N 311389 241260

N18 N 311329 241320

N20 N

311391 241279

N21 N

N22 N

N23 N

N24 N

N25 N

N26 N311391 241279

N27 N

N28 N 311357 241276

N29 N 311362 241273

N30 N 311320 241333

N31 N 311327 241341

N32 N 311322 241351

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Att

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F

Attachment F

CONTROL & MONITORING

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ATTACHMENT NO F CONTROL & MONITORING

CONTENTS ATTACHMENT F.1 – TREATMENT, ABATEMENT & CONTROL ............................ F-1

Air Quality ............................................................................................................. F-1

Surface Water Drainage ....................................................................................... F-7

Foul Water Drainage .......................................................................................... F-10

Noise Abatement ................................................................................................ F-11

Process Control Monitoring ................................................................................ F-12

Inspection, Maintenance and Monitoring ............................................................ F-13

Contingency Plans for Plant Breakdown ............................................................. F-13

ATTACHMENT - F. 2 – EMISSIONS MONITORING & SAMPLING ....................... F-15

Air Monitoring Methodology ................................................................................ F-15

Surface Water Monitoring Methodology .............................................................. F-16

Sewer Monitoring Methodology .......................................................................... F-17

Noise Monitoring Methodology ........................................................................... F-17

Dust Monitoring Methodology ............................................................................. F-17

ATTACHMENT - F. 3 – TABULAR DATA.............................................................. F-18

FIGURES ............................................................................................................... F-19

TABLES

Table F.1 Proposed Emissions Monitoring and Sampling Points ............................ F-15

Table F.2 Permitted Rating Noise Levels ............................................................... F-17

Table F.3 Tabular Data on Monitoring and Sampling Points .................................. F-18

FIGURES

Figure F.1 Schematic of Odour Control System ..................................................... F-19

Figure F.2 Schematic of Anaerobic Digestion Process Flow .................................. F-19

Figure F.3 Schematic of Surface Water Drainage System Flow ............................. F-19

Figure F.4 Schematic of Foul Water Drainage System Flow .................................. F-19

Figure F.5 Location of Proposed Emissions Monitoring & Sampling Points for Atmosphere, Surface Water and Sewer ................................................................. F-19

Figure F.6 Location of Proposed Noise Monitoring Locations ................................. F-19

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Proposed Renewable BioEnergy Plant F-1 Stream BioEnergy Ltd. Huntstown, North Road, Finglas, Dublin11

ATTACHMENT F.1 - TREATMENT, ABATEMENT & CONTROL This attachment provides an overview of the main abatement and control aspects of

the plant. A number of the assessments contained within the Environmental Impact

Statement (EIS) should be read in conjunction with this attachment, namely Chapters

8 (Air Quality and Climate), 10 (Noise and Vibration), 12 (Soils and Geology), 13

(Hydrology) and 14 (Hydrogeology). These chapters provide detailed information on

abatement and treatment procedures for the activity under the mitigation sections.

All drawings referenced as PL within this Attachment are presented within the

Planning Drawings which accompany this application.

Table F.1(i) has been completed for each emission point, these tables are presented

within the application form.

All measures outlined below are in accordance with Best Available Techniques (BAT)

as prescribed in the European Commission’s Reference Document on Best Available

Techniques for the Waste Treatment Industries 2006 (WT BREF).

Air Quality This section should be read in conjunction with Chapter 8 of the EIS (Volume II). The

main emissions to atmosphere from the site will arise from two CHP units (discharging

products of combustion), from the biogas flare stack (discharging products of

combustion), and from the odour control system (discharging treated air from the main

building and process pipes and tanks). As part of the EIS, air dispersion modelling

was carried out for the emissions to atmosphere (AERMOD Prime (12060)) in order to

provide the most conservative dispersion estimates. This demonstrated that the

ground level concentrations of the modelled parameters will be less than their

corresponding environmental assessment levels and no international or Irish air

quality standards are forecast to be exceeded. The stack heights presented below for

each of the three point source emissions to air are therefore considered to represent a

good level of environmental performance, to ensure adequate dispersion.

• A2-1: a single multi-flue stack which will discharge the residual levels of

pollutants from 2 x 2MW combined heat and power (CHP) engines and the

standby boiler to atmosphere at a height of 28m above ground level;

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(The Agency should note that A2-1 in this application refers to the combined

emission points of A2-1 and A2-2 referenced in the EIS).

• A2-3: a standby gas flare which can be used to combust excess biogas when

combustion by the CHP or storage in the gas holder is unavailable;

• A2-4: odour control stack through which treated air from the odour control

system will be vented for dispersion to atmosphere at a height of 25m above

ground level.

Odour Control A three stage odour control system, comprising a biotrickling filter, plasma injection

treatment and carbon polishing, will be located immediately adjacent to the main

building. The odour control system will be based on the principles of good odour

management including:

• Odour containment;

• Odour capture;

• Odour extraction; and

• Odour treatment.

In terms of odour containment, the main building will be sealed with a near 100% leak

proof building fabric. All external process features, such as pipework and tanks, will be

enclosed and sealed, with negative extraction applied to ensure no fugitive emissions

of odours during operation. All waste handling and pre-treatment activities will be

carried out indoors at the facility. The building will be placed under negative pressure.

A total extraction volume flow rate of up to 110,000 Nm3/hr will be applied to the main

building and any external process pipework and tanks at which odour extraction is

deemed necessary. The waste intake buildings will be fitted with rapid roller doors

which will be interlocked and fitted with air curtains so as to maintain good building

integrity in terms of odour containment (main access doors only) when doors are

opened intermittently during delivery of feedstock. Pedestrian doors will remain closed

and only open when access is required.

In terms of odour capture, a network of extraction pipework will be fitted throughout

the main building and process equipment so as to provide negative pressure

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extraction to all odour generation areas / tanks/ sumps located within the facility

boundary. This will be ducted to the odour control system for treatment.

Two variable speed driver (VSD) controlled fans will be connected to the ductwork

whereby odourous air will be extracted and ducted to the odour treatment plant. The

three stage odour treatment plant will consist of a biotrickling filter, followed by plasma

injection, and finally carbon polishing, prior to all treated air being vented through a

25m high stack for final dispersion.

The biotrickling filter stage will be filled with an organic media upon which micro-

organisms such as bacteria and fungi can grow. The micro-organisms will degrade

any malodorous particles within the air that is passed through the filter, thus removing

any potential odour.

The biotrickling filter will consist of two filter bed containers 6.5m wide by 26.50m long.

Each filter bed will have a bed height of 4.5m. There will be two filtration beds stacked

over each other giving a total biofiltration system height of 14.60m. The filtration bed

media will consist of an inorganic media thereby allowing the beds to be stacked 5m

in height unlike traditional wood chip media. The media has excellent pore structure,

porosity, structural integrity, is free draining and is totally inert. The typical lifespan of

such media is approximately 15 to 20 years. The total bed media volume will be

1,550m3. The extracted air will pass through these filter beds which will provide a true

residence time of 40 seconds. Each biotrickling filter will be an enclosed structure

protected from the external environment.

Nutrient rich liquor will be recirculated intermittently within the filter bed system in

order to create the optimum conditions for the biological filter to successfully achieve

the necessary scrubbing of the extracted air.

All liquor drained from the biotrickling system will be filtered using two high efficiency

self cleaning filters to a filter pore size of less than 100µm. This liquor will be pumped

to an aerated holding tank where essential nutrients will be dosed at a specific rate in

order to ensure the biological system has sufficient essential macro and micro

nutrients present for effective biological activity and degradation. The pH and

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conductivity of the liquor will be monitored and adjusted as required within this

bioreactor.

Following biotrickling filtration, the air will be passed through a vane eliminator

capable of removing greater than 99.5% of water droplets greater than 2µm. At this

stage the air will enter a mixing chamber where plasma injection will occur. Plasma

injection will perform additional odour treatment whereby the plasma oxidant will mix

and degrade residual odours within the air stream that have not been captured within

the biotrickling stage.

This will then be pumped forward to a dual annual carbon filtration vessel whereby

any remaining residual odours will be filtered from the air stream. The annular bed

carbon filtration system will be divided into two separate streams. Each bed will have

a retention time of approximately 2.2 seconds and contain general purpose steam

activated bituminous coal 4mm pellet carbon media. The carbon media will become

impregnated with the plasma thereby also further enhancing the oxidative potential of

the carbon / plasma combination system.

All treated air will be exhausted through a single 25m stack. The overall system will be

capable of achieving an exhaust odour threshold concentration of less than 1,000

OuE/m3 with a typical value in the exhaust stream of 700 OuE/m3.

The system has been designed with 100% duty and 50% standby in mind so that

odour treatment coverage is available during routine maintenance of either system.

Figure F.1 at the end of this attachment shows a schematic of the odour control

system.

Dust The process has been designed to control emissions of dust. Waste will be delivered

and pre-treated entirely in an enclosed building maintained under sub-atmospheric

pressures to contain, collect and treat dust and particles. The Air Quality Assessment

demonstrates that dust and particulate emissions will not be significant during the

operational phase.

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Combined Heat and Power Plant & Biogas Treatment The biogas produced from the AD process will be converted to electricity and heat in

the CHP plant which will comprise two units, each rated at 2MWe. Combustion gas

emissions from the two CHP units, and the standby boiler, will be discharged to the

atmosphere at a height of 28m above ground level via two flues within a single

combined wind shield stack.

Biogas can contain hydrogen sulphide (H2S) generated from the degradation of

protein matter in the organics. In order to limit the SOx emissions from the CHP, H2S

in the biogas will be controlled by the addition of ferric chloride to the digestion tanks.

Ferric chloride locks sulphides up as salts within the sludge preventing the

volatilisation into the biogas. In addition the biogas will be treated in a gas scrubber

prior to the CHP, which will also provide for H2S removal, as well as drying the biogas

to remove moisture (condensate) using a dehumidifier. The condensate will be

recirculated to the AD process.

The combustion of biogas in the CHP plant will destroy any potentially odorous

compounds contained in the gas.

Gas Holder Biogas passes to the CHP units from the digester tanks via a gas holder. The biogas

holder is a double membrane system with c.1,800m3 capacity, and has two primary

functions. Firstly the gasholder is a safety device maintaining system pressure for the

digestion and feed buffer tanks. When liquid is pumped out of one of the tanks the

gasholder provides biogas to replace the lost volume hence maintaining system

pressure. Similarly when biogas is produced within a tank the gasholder acts as a

storage volume for this gas hence preventing an increase in gas pressure.

Secondly the gasholder acts as a buffer for biogas production and use. The

combined heat and power plant uses biogas at a fixed rate, whereas biogas

production may vary slightly above and below this figure. The gasholder acts as a

buffer to allow the CHP to operate at a constant rate with varying gas production.

The gasholder acts as the pressure regulating device in the gas system. Air is blown

into an outside bag which surrounds the inner gasbag. The air outlet is restricted by a

regulating valve to create a constant air pressure in the outer bag (20 – 25mbarg),

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and this in turn pressurises the gas to the same pressure. By maintaining the gas at a

positive pressure at all times the risk of oxygen (from air) being drawn into the gas

system from a leak or relief valve is eliminated and hence the potential for an

explosive mixture of methane and air is eliminated within the process plant.

Figure F.2 at the end of this attachment shows a schematic of the Anaerobic

Digestion Process Flow.

Gas Flare The flare stack (c.8.2m tall) is designed to operate in the event that more biogas is

generated than is used. The flare stack will normally only be required to operate when

the CHP units are not in use for routine maintenance and are unavailable to use the

biogas produced by the digester. The expected availability of CHP engines is >93%.

There are two CHP units and normally only 1 engine will be off line (for maintenance)

at a time. The duty of the flare is designed to the maximum hourly biogas production

rate.

The function of the flare stack is to prevent the gasholder from becoming overfull,

which would in turn result in over pressurisation of the gas system. The combustion

of biogas in the gas flare will destroy any potentially odorous compounds contained in

the biogas.

Pressure Relief Valves The gas holder and digester tanks will be fitted with a pressure and vacuum relief

valve that will protect against excessively high or low pressures which, could occur

under abnormal fault conditions such as in the very unlikely event that both CHP units

and the flare stack are all unavailable at the same time. This device is a safety device

and will not operate under normal working conditions, however under abnormal

conditions this valve is designed to release biogas to the air. The availability of CHP

is expected to be >93% (for each engine) and availability of the flare >95%, therefore

the risk of PRV venting equals 0.02%.

Standby Boiler A dual fuel (biogas and diesel) standby boiler will be located adjacent to the CHP units

to provide hot water for pasteurisation and digester heating requirements in the event

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that the CHP units go out of service (planned or unplanned). The boiler will also

provide heat during the commissioning phase of the plant. Storage for hot water is

provided immediately adjacent to the boiler.

A summary of all incorporated operational and construction phase mitigation

measures and techniques to prevent or reduce air emissions from the plant are

summarised in Chapter 8 of the EIS (Volume II).

Surface Water Drainage This section should be read in conjunction with Chapter 13 of the EIS (Volume II).

The site has been evaluated for Sustainable Drainage Systems (SuDS) and the most

suitable measures have been incorporated into the surface water management

system design for the plant. The SuDS measures incorporated are designed to

manage and control surface water runoff from the development and also to treat the

runoff in order to remove any suspended solids and hydrocarbons prior to discharge.

Rainwater harvesting is a key measure included in the management of surface water

runoff for the plant. Rainfall runoff from the site will be stored and attenuated within

above and underground storage tanks and pipework, and will be used for ancillary

processes such as washwater for the floor of the reception, processing and storage

areas of the main building, as well as in the vehicle and wheelwash facilities. Excess

runoff will be discharged from the site to the surface water drainage network at a

controlled release rate. There will be no discharge of process effluent, other than to

the foul sewer.

The surface water drainage system has been designed to discharge excess runoff

into the existing storm water open ditch to the north of the existing main access road.

The greenfield run-off rate in the local area of North Dublin is approximately 6l/s per

hectare, which equates to approximately 10.5 l/s from the subject site into the existing

ditch. It is estimated that an average of approximately 12m3 per month of clean runoff

will be discharged after rainfall harvesting which is significantly lower than the

greenfield runoff rate from the subject site.

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The preliminary design of the surface water drainage system was undertaken by SLR

utilising WinDes software package and considers the 1 in 100 year storm, together

with an additional allowance of 20% to cater for the effects of climate change.

Run-off from the following sources is classified as ‘grey water’ and is routed through

the proposed surface water drainage system:

(i) Roof run-off;

(ii) External pavement and hardstanding run-off; and

(iii) Run-off ordinarily collected from within the bunded tank farms (assuming no

leakages have been identified).

Surface water from sealed pavement around the proposed plant will be collected by

surface gullies and transferred via a sealed pipework system to a manhole close to

the northern site boundary (identified as SWMH21 on Drawing PL37). If being

discharged from site, surface water run-off will pass from this point through a silt trap

and oil / water separator and discharge through a pipe running beneath the quarry

access road to the outfall at the existing open ditch located beyond the verge on the

northern side of the access road. The water discharged to this ditch will ultimately flow

northwards via the existing drainage network to the Ballystrahan Stream and the Ward

River.

Surface water run-off from the building roof will be collected in roof gullies and carried

by downpipes and drains to an overground stormwater storage tank adjacent to the

western containment bund. This tank will provide a maximum of 2,000m3 storage

capacity and is intended to store captured run-off from the site, pending its re-use on-

site, thereby conserving mains water.

Water will be pumped from the carrier drains to the storage tank provided there is

storage capacity available. When the overground stormwater tank is full, roof run-off

will be diverted into the pavement run-off system and routed toward the outfall. A

control system will be incorporated that will divert roof run-off to the overground

storage tank as and when storage capacity is available.

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Any rain water collecting within the bunded tank farms will be pumped via a small

drainage sump into the surface water drainage system, provided there is no evidence

of potential contamination or spill within the bunded area.

The rate of discharge to the drainage ditch on the northern side of the access road will

be limited to the greenfield discharge rate by a flow control device (eg. Hydro-Brake)

fitted at manhole SWMH21. In designing the drainage system, it is assumed that

during a design storm event, there will be no storage capacity available at the

overground tank and that large diameter pipework will provide appropriate storm water

attenuation. In addition to attenuation within the sealed pipe system, a stormwater

storage crate system will provide approximately 450m³ of attenuation capacity

upstream of manhole SWMH21.

Water held in the sub-surface attenuation tank will be pumped to the overground

storage tank, as and when there is excess storage capacity available.

Systems are built into the design of the site to ensure that environmental media are

not impacted in the event of abnormal operations such as a fire event. The outfall to

the quarry drainage can be manually shutdown in the event of a fire. The systems are

based on the principle of segregating potentially contaminated surface waters and

ensuring suitable storage and containment is present in the event of contaminated

firewater being generated.

In the event of a fire, the contained system will allow firewater to be rerouted to either

the underground attenuation tank or storm water tank for retention on site until quality

analysis of the water is undertaken which will inform an appropriate and safe method

of disposal. Contaminated waters are therefore prevented from reaching the quarry

drainage network, ground or groundwater.

An outline of the proposed surface water drainage system is provided on Figure F.3

and also on Drawing PL37. Surface water drainage design calculations are provided

in Appendix B of the SLR Consulting Proposed Drainage Strategy Report presented in

Appendix 13-3 of the EIS (Volume III). Typical details for various elements of the

surface water drainage system are provided on Drawing PL38.

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A summary of all incorporated operational phase mitigation measures and techniques

to avoid pollution as a result of surface water emissions are summarised in Chapter

13 of the EIS (Volume II).

Foul Water Drainage An on-site Wastewater Treatment Plant (WwTP) is an important element of the

proposed plant. This facility will treat separated liquid digestate from the centrifuge

stage of the AD process. Process water discharged from the wheelwashes and

vehicle wash will also be diverted to the onsite WwTP. However, it should be noted

that runoff from the washing of the main building floor will be captured and recycled

directly to the AD process.

The WwTP will utilise aerobic sequential batch reactor (SBR) technology and the

process will perform as a combined activated sludge and settlement tank removing

ammonia and BOD and solids from the liquid stream such that the treated liquid is of a

suitable quality to be recycled to the biomass mixers located in the pre-treatment area

of the main building or to be discharged to the municipal sewer.

Each SBR will operate on 4 cycles per day of 6 hours per cycle. Each cycle will

consist of a fill and aerate period followed by an aeration period. Once the ammonia

has been aerobically converted to nitrate / nitrite the aeration will stop to allow solids

to settle and following the settlement period the top fraction of liquid will be decanted

into the treated process water balance tank from where it will be recycled into the AD

process.

During the aerobic conversion of ammonia, alkalinity is consumed by the process and

it is therefore necessary to add alkalinity. This alkalinity is added in the form of caustic

soda which, is dosed directly to the SBRs under automatic pH control (from a tank

mounted pH meter). The caustic soda addition will be such that pH is maintained at

7.0 to 7.5 within the SBRs. Caustic Soda will be contained within a dedicated bunded

tank located outside the WwTP bund wall and will be pumped to the SBRs by dual

containment pipework.

Air blowers for the WwTP plant are located immediately outside the tank farm bund

wall in acoustic containers.

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The treated process water from the WwTP is recycled into the main process and is

used to dilute the incoming feedstock. Excess treated process water that is not

required for the process will be discharged to the municipal sewer. A foul water rising

main will be constructed as part of this proposed development that will connect the

plant with the municipal sewer network at a point located on North Road (see Drawing

PL39). Further details on the connection of the plant to the municipal sewer network

are provided in Sections 2.65 to 2.70 of Chapter 2 of the EIS (Volume II).

It is estimated that up to 200m3/day of treated process effluent will be discharged to

the sewer. This effluent will have a significantly reduced organic loading following the

treatment in the on-site WwTP, with a maximum population equivalent of

approximately 750 (based on 1 PE = 54g of BOD per day).

A schematic of the foul drainage system in presented in Figure F.4.

Noise Abatement Table E.2 in Attachment E.5 presents the operational fixed plant noise sources. The

main generators of noise will be the CHP engines, SBR blowers and the waste pre-

treatment activities that will be undertaken inside the main building.

The CHP engines and the SBR blowers will be housed in acoustic enclosures with a

minimum Rw of 24 dB(A), whilst the standby boiler and gas boosters will be housed in

containers with a minimum Rw of 24 dB(A).

The waste pre-treatment operations will take place in the main building. This building

will be constructed using Kingspan wall and roof panels. The wall panels will have a

minimum sound reduction index (Rw) value of 24dB(A), whilst the roof panels will

have a minimum Rw value of 26dB(A). The access roller shutter doors will remain

closed in between vehicles entering and exiting the building.

The noise assessment presented in Chapter 10 of the EIS (Volume II) demonstrates

that the EPA NG4 noise criterion limits as prescribed for daytime, evening, and night-

time are comfortably met at all four noise sensitive locations (NSL) assessed. These

limits are also met at the site boundary location. Therefore, mitigation measures to

reduce operational noise are considered unnecessary.

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Process Control Monitoring All aspects of the plant will be controlled and monitored by a central electronic

Supervisory Control and Data Acquisition (SCADA) telemetry control system. The

system will allow for maintenance of optimum conditions required at the various

stages of the plant to ensure safe and efficient operation of the plant.

The SCADA system will be designed, installed and commissioned to receive and

control all plant and equipment including the CHP units on site. The system has clear

screen pictures representing each stage of the process, ensuring that the operational

staff will have a quick and easy overview of the plant operation.

Instrumentation equipment will be located throughout the plant to ensure safe

operation of the plant and will allow measurement of the plant’s operation and

performance. These will include measurements of the feed rates into tanks; level

controllers in the digester tanks; temperature transducers to continuously measure the

temperature within the tanks; the quality of the gas produced; links to the gross and

parasitic meters; and the discharge from the tanks. Measuring instrumentation will be

independently calibrated as required and applicable certificates will be contained and

held on record.

All data collected in the system can be used to generate reports both for internal use

as well as reporting to external authorities. The control system will also be able to

store data to record historical trends.

The SCADA system will include a service modem that will allow remote operation of

the plant. It will be possible for the technology provider to remotely connect to the

plant to provide support.

This system will incorporate alarm tagging so as to ensure consistent performance

over the lifetime of the plant. All alarms will be received by the operator via mobile

phone and are prioritised. Therefore any situations that develop during night-time,

weekends and holiday periods will be remotely detected by the operator. This

together with the remote connection facility will allow the operator to evaluate the

importance of the incident and to determine the level of action required.

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Inspection, Maintenance and Monitoring Infrastructure, surfacing and equipment within the site (including tanks, bunds, pipes,

structures, roads, hardstand areas, drains etc.) will be inspected on a regular basis to

check for equipment malfunctions, structural deterioration, operator errors and leaks

and will be maintained and repaired as necessary. Tanks will be fitted with level

indicators to prevent overfilling. In addition, the operator will undertake visual checks

on all plant and equipment at least once a week and, if deemed necessary, bring

forward any planned maintenance or undertake remedial works.

Site operatives will undertake regular monitoring for evidence of spillage and leakage.

Records of all visual and scheduled inspections and details and certificates (where

appropriate) of any maintenance work will be regularly updated and maintained.

Maintenance schedules for equipment will be regularly reviewed and updated.

In the event of damage or deterioration being detected, all maintenance work will be

carried out in conformance with the operators Health and Safety Policy.

A general piping inspection will be carried out at least once every five years and will

include inspection for outer corrosion, pipe support integrity and function of safety

devices. A general tank inspection will be carried out every 3 to 15 years depending

on the tank type and will include an internal inspection and pressure test.

Contingency Plans for Plant Breakdown The entire site process will be constantly monitored on a SCADA system to

continuously assess the performance of the plant and identify any adjustments

necessary to prevent technical issues arising. Should any problems, malfunctions or

breakdowns occur within the AD process, treatment will be stopped until such time as

the problems are rectified. If necessary incoming feedstock will be diverted to

alternative facilities to prevent any build up within reception halls.

All of the plants abatement systems will also be connected to the sites’ SCADA

system which will ensure plant shutdown in the event of any abatement system failure

or breakdown.

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In the event of a power cut or ‘black-out’ the plant will automatically shutdown.

Feedstock will be prevented from entering the process during periods of automatic

shutdown and most electrical/electronic equipment, motors and fans will cease

operating except those required to cool the plant and provide emergency lighting.

In the event of a black out, however, such motors and fans will require an emergency

power supply. This will be provided by a backup or emergency electrical generator

powered by a diesel motor. Detection of a power supply failure to critical motors and

fans will activate the automatic shutdown system and the emergency power generator

simultaneously. The automatic shutdown system will then restart the critical motors

and fans using the emergency generator. The emergency generator will be controlled

manually. The backup generator will be tested but only used during automatic

shutdowns or a black-out.

The site manager will be responsible for directing all Operations and Maintenance

(O&M) activities on site. Fulltime on-site Plant Maintenance Engineers will work to

proactively manage the maintenance of the plant. This work will involve the immediate

resolution of any technical problems that may arise.

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ATTACHMENT F. 2 - EMISSIONS MONITORING & SAMPLING Details of the proposed emissions monitoring and sampling points for the plant are

presented in Table F.1 below. The location of sampling points for emissions to

atmosphere, surface water and sewer are presented in Figure F.5 at the end of this

attachment and in Drawing PL07. Proposed noise monitoring locations are presented

in Figure F.6 and Figure 10-1 of Chapter 10 of the EIS (Volume II).

Detailed plans of emission points are presented in Drawings PL27, PL29, PL30, PL37

and PL39 of the Planning Drawings which accompany this application.

Table F.1 Proposed Emissions Monitoring and Sampling Points

Reference Description

A2-1 Combined gas engines (x2) and standby boiler discharge point - 28m discharge stack

A2-3 Standby gas flare – 8m discharge stack

A2-4 Odour control system – 25m discharge stack

SW1 Located at northern site boundary after the hydrocarbon interceptor and silt trap.

SE1 Located at south western boundary of subject site at the package pump station

N1 Residential property c.707m east of the centre of the subject site

N2 Residential property c.535m northeast of the centre of the subject site

N3 Residential property c.640m south of the centre of the subject site

N4 Residential/Commercial property c.450m east of the centre of the subject site

N6 Subject site southern boundary location

Tables F2(i) and F2(ii) have been completed as relevant and are presented within the

licence application form.

Air Monitoring Methodology An inherent part of the licensing system is the setting of emission limit values (ELV)

on discharges to atmosphere. The Agency sets these limits having regard to the

principles of BAT and the overriding imperative that ground level pollutant levels

beyond the boundary remain below the appropriate Air Quality Standards (e.g. World

Health Organisation Air Quality Guidelines).

All monitoring will be undertaken in line with the Agency’s Guidance Note on Site

Safety Requirements for Air Emissions Monitoring (AG1) and Air Emissions

Monitoring Guidance Note (AG2).

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To demonstrate compliance with an ELV the monitoring of the CHP and Standby

Boiler at A2-1 will be conducted post abatement so that the exhaust gases are

representative of those that are released to atmosphere.

Measurement will be undertaken when the process is at a maximum sustainable level

and where emissions are stable or as close to that level as is reasonably practical.

Odour monitoring will be carried out on the emissions from the odour control system.

This will comprise annual dynamic olafctometry testing by an independent specialist

consultancy. In addition, facility staff will carry out periodic odour patrols along the site

boundary and will record the findings in a daily log.

Surface Water Monitoring Methodology The methodology to be employed in monitoring the storm water discharge from the

proposed site at SW1 will be in line with the Agency’s Guidance on the setting of

trigger values for storm water discharges to off-site surface waters at EPA IPPC and

Waste Licensed Facilities (2012).

It is not envisaged that the licence will specify ELVs for the proposed discharge from

SW1 as the discharge will only consist of uncontaminated storm water runoff. Trigger

levels, if set by the Agency; will be monitored by analysing grab samples collected

when emissions are taking place. A documented response programme in the event

of reaching or exceeding trigger level values will be put in place.

A visual examination of the storm water discharges shall be carried out daily. A log of

such inspections shall be maintained.

Grab samples will be collected at the outfall from the Oil Interceptor. Samples will be

collected weekly and visually checked for evidence of contamination. At quarterly

intervals the sample will be tested for ph, BOD, COD, Mineral Oils and Total

Suspended Solids.

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Sewer Monitoring Methodology It is proposed that monitoring of pH, BOD, COD, Suspended Solids and Ammonium

(NH4) will be undertaken on a quarterly basis. The methodology for monitoring during

operation is to be agreed with the Agency.

Noise Monitoring Methodology The noise assessment presented in Chapter 10 of the EIS (Volume II) defines each of

the baseline monitoring locations including four noise sensitive locations and one

boundary location as being ‘not an area of low background noise’ in accordance with

the standards set out in the Agency’s Guidance Note for Noise: License Applications,

Surveys and Assessments in Relation to Scheduled Activities (NG4). The permitted

rating noise level for areas defined as ‘not an area of low background noise’ as

presented in the NG4 guidance is presented in the Table below.

Table F.2 Permitted Rating Noise Levels

Designation Daytime Noise

Criterion, dB LAr,T Evening Noise

Criterion, dB LAr,T Night-Time Noise Criterion, dB LAr,T

All other Areas 55.0 50.0 45.0

It is proposed that noise monitoring will be undertaken annually at the four noise

sensitive locations (N1-N4) and one boundary location (N6) as presented in Figure

F.6.

Dust Monitoring Methodology In line with Condition 14 of the grant of planning permission (reg. Ref. FW13A/0089)

dust deposition monitoring will be conducted in accordance with VDI 2119

‘Measurement of Dustfall, Determination of Dustfall using Bergerhoff Instrument

(Standard Method)’, German Engineering Institute. The monitoring will be carried out

annually and one event will be undertaken between May and September.

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ATTACHMENT F. 3 - TABULAR DATA

Table F.3 Tabular Data on Monitoring and Sampling Points

Point Code

Point Type Easting Northing Verified Emission

A2-1 S 311445 241219 N CO, NOx SO2, TPM, NH3, TNMVOC

A2-4 S 311336 241266 N Odour, NH3

SW1 S 311412 241300 N pH, BOD, COD, Mineral Oils, SS

SE1 S 311319 241278 N pH, BOD, COD, SS, NH4

N1 M 312095 241135 N db(A)

N2 M 311920 241380 N db(A)

N3 M 311558 240659 N db(A)

N4 M 311762 241545 N db(A)

N6 M 311357 241188 N db(A)

The data presented above is also contained in excel format as required by the Agency

within a separate CD-Rom entitled IED Licence Application Sections B.2, E.6 and F.3.

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FIGURES

Figure F.1 Schematic of Odour Control System

Figure F.2 Schematic of Anaerobic Digestion Process Flow

Figure F.3 Schematic of Surface Water Drainage System Flow

Figure F.4 Schematic of Foul Water Drainage System Flow

Figure F.5 Location of Proposed Emissions Monitoring and Sampling Points for Atmosphere, Surface Water and Sewer

Figure F.6 Location of Proposed Noise Monitoring Locations

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Figure F.1 Schematic of Odour Control System

Odour Control System

Bio-Trickling Plasma Injection Carbon Filtration System

Main Building

WwTP

Stack (Dispersion)

AD Tanks

Pasteurisation

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Figure F.2 Schematic of Anaerobic Digestion Process Flow

Digester

Gas Holder

Gas treatment (H2S Scrubber Dehumidifier)

Thermal Output

Electrical Output

Back-Up Flare

Stand-By Boiler

CHP Engines

(Back-up)

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Figure F.3 Schematic of Surface Water Drainage System Flow

Main Building

Roof

Roads, Paved Surfaces &

Hardstanding Areas

Open Storm

Water Ditch

Containment Bunds

Over-ground Storage Tank

Under-ground

Attenuation Tank

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Figure F.4 Schematic of Foul Water Drainage System Flow

Centrifuge

(Liquid Fraction)

WwTP

SBR Technology

Foul Water Raising

Main

Municipal Sewer

Network

Process

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L

A

N

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C

A

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+78.000

+78.000

+79.335

1516

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Tel: 028 7930 0866

NOTES

Scale Date




LEGEND


CLIENT:

16.06.14RD RD-



Atmosphere, Surface Water and Sewer

Monitoring and Sampling Points for

Title - Location of Proposed Emissions,

June 20141:1000 / A3

2388 - Figure F.5


Existing wayleave for 220 kv cable to HuntstownPower Station

Proposed new sewer line from pumping station

KEY TO BUILDINGS AND PLANT

Proposed Emissions Monitoring and SamplingPoints for Atmosphere, Surface Water and Sewer

Emission Ref Easting NorthingA2-1 (Combinedemission point)

311445 241219

A2-3 311480 241202A2-4 311336 241266SW1 311412 241300SE1 311319 241278

EMISSION REFERENCE TABLE

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7

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Tel: 028 7930 0866

NOTES

Scale Date




LEGEND


CLIENT:

16.06.14RD RD-



Locations

Title - Proposed Noise Monitoring

June 20141:4000 / A3

2388 - Figure F.6

N

W

S

E


Location and number of noise monitoring points

Proposed directional signage locations

Monitoring Point Easting NorthingN1 312095 241135N2 311920 241380N3 311588 240659N4 311762 241545N6 311357 241188

MONITORING POINT REFERENCE TABLE

N6

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Documents

Attachment E · the gas utilisation engines will exhaust through a 28m stack, the flare will exhaust through an 8m stack and the odour control system through a 25m stack. In terms