metal processors ae-1 stack emission point clondalkin, co. dublin · 2019. 11. 14. · metal...

Email: [email protected] www.enviro-consult.com

Registered Office: Parnell House, 19 Quinsboro Road, Bray, Co. Wicklow A98 XV04. Registered Number 243 412 Directors: Robert B. Sutcliffe, Ronan T. Sutcliffe

Environmental Services for Industry Including – ► Air, Noise & Water Monitoring ► Energy & Water use reduction ► Bund Testing ► IPC/IED/Waste Licence Compliance ► Environmental Management Systems to ISO 14001 ► EIS & Planning ► Air & Noise Modelling ► Workplace Dust & Noise Affiliations & Accreditations ► ISO9001:2015 Registration No. 2015/2170 ► ISO14001:2015 Registration No. 2012/1427 ► MCERTS Certified personnel for stack testing ► Member of Royal Society for Prevention of Accidents

Bray (Ireland) 01 276 1428 Cork (Ireland) 021 453 6155 Lisburn (N. Ireland) 028 9262 6733 Birmingham (GB) 0121 673 1804

Air Dispersion Model Report 2019

For

Metal Processors AE-1 Stack Emission Point Clondalkin, Co. Dublin

Document Number 2083-08 v1.00

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http://www.enviro-consult.com/

Metal Processors Air Dispersion Model Report 2019

Document Reference.: 2083-08 v1.00 of 20

Document Lead Sheet C

lien

t

Organisation Metal Processors Ltd

Site Metal Processors Ltd, Station Road, Clondalkin, Dublin 22

Permit/Lic No. (if applic) To be confirmed

Client contact Noreen Maye

Order Proposal number N/A

Client PO or other reference N/A

Del

iver

able

Report title Air Dispersion Model Report 2019

Document number 2083-08

Report template Standard Report template

Type of document Report

Method Statement N/A

Format for issue PDF

Ap

pro

val &

Issu

e Site visit by N/A Date last site visit N/A

Document author GB Date written 26/07/2019

Approved by RD Date approved 26/07/2019

Report version nr v1.00

Issued by RD Date report issued 26/07/2019

Doc issued to Noreen Maye

Method issue Email

Act

ion

All results satisfactory Yes

If not satisfactory, further testing required No

If satisfactory, when is next test due? N/A

Conditions relating to the issue of this report: 1. No alteration to this report by third parties is permitted 2. Where this report is reproduced, it shall only be reproduced in full. 3. Reports remain the property of Environmental & Efficiency Consultants (Ireland) Limited until paid for in full.

Revision History

Date Rev. Level Amendment Made New Rev Level

Initials

New Document 1.00 RD

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Table of Contents

1. INTRODUCTION 4

2. SUMMARY 4

3. METHOD 4

3.1 DESCRIPTION OF THE DISPERSION MODEL 4 3.2 POLLUTANTS AND QUALITY GUIDELINES 5 3.3 SOURCES 6 3.4 RECEPTOR GRID 11

4. RESULTS 12

5. CONCLUSION 13

APPENDIX 1 DISPERSION MODEL RESULTS OUTPUT FILE 14 APPENDIX 2 CONTOUR PLOTS 16

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1. Introduction Environmental Efficiency Ltd. was commissioned by Metal Processors Ltd. to perform dispersion calculations from their AE-1 stack based on input data from previous stack emissions monitoring dating from 2016 to 2018. The site where the emissions are released is at Station Road, Clondalkin, Dublin 22. An Air Dispersion Model (ADM) was carried out to predict the impact on the local environment. The following parameters were modelled:

Particulates as PM10 Arsenic Cadmium Copper Nickel Lead Antimony Tin Zinc

2. Summary All parameters modelled are shown to be within the required limits. Considering the results, it is deemed that air emissions from the stack AE-1 on-site will have a negligible impact on ambient air quality.

3. Method

3.1 Description of the Dispersion Model

The model selected for this project was AERMOD Version 7.6.1. The U.S. Environmental Protection Agency (USEPA) and American Meteorological Society (AMS) developed the AERMOD dispersion model in conjunction with one another in 1991. It was developed to succeed the ISCST3 software which was the main air dispersion model previously used. The AERMOD dispersion modelling software is based upon the theoretical understanding of the atmosphere. It is a steady-state Gaussian plume model which can estimate dispersion from multiple sources (point, area, volume etc.) using current concepts regarding boundary layer characterisation and dispersion. The hourly meteorological data used by the model is pre-processed by the AERMET meteorological programme. Effects of complex terrain are prepared by the AERMAP terrain pre-processor. The model also uses site specific information such as emission rates, building dimensions, emission point details and background level. The dispersion model is carried out in line with the requirements of the EPA’s “Air Dispersion Modelling from Industrial Installations Guidance Note (AG4)” guidance document. Overall results are known as Predicted Environmental Concentration (PEC). PEC is the sum of the Predicted Process Concentration (PC) + Annual Background Concentration (BC).

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Figure 3-1 ADM project flowchart

3.2 Pollutants and Quality Guidelines

The Environmental Protection Agency (EPA) is the competent authority for ambient air quality

monitoring in Ireland. Limits are set for the following substances under the Clean Air for Europe

Directive (2008) and the First Daughter Directive and the Fourth Daughter Directive (2007);

Table 3-2 National Air Quality Standards for Particulates (as PM10) and Lead

Parameter Averaging Period Limit Value

ug/m3

Criteria

Particulates (as PM10) 24 hours 50 Not to be exceeded

more than 35 times in

a calendar year

Calendar year 40 Annual mean

Lead Calendar year 0.5 Annual Mean

Table 3-3 National Air Quality Standards for Arsenic, Cadmium and Nickel

Parameter Averaging Period Limit Value

ug/m3

Criteria

Arsenic Calendar year 6 Annual mean

Cadmium Calendar year 5 Annual Mean

Nickel Calendar year 20 Annual mean

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The results of the ambient air quality monitoring by the EPA are of particular importance

where air dispersion modelling (ADM) is required as this monitoring provides data for the

background concentration. Background concentration data needs to be included in the

assessment and is added to the process contribution of the facility in order to arrive at the

Predicted Environmental Concentration. The overall impact of the proposed development is

then based on the Predicted Environmental Concentration.

Ireland is divided into 4 Zones for the purposes of ambient air quality. Metal Processors Ltd.

is in Zone A.

Long-term monitoring was carried out at an Urban Zone A location in Clondalkin in 2012.

Unfortunately, the only parameter that has valid EPA data is for Particulates (as PM10).

Maximum daily value 99.9 µg.m-3

Mean daily value 19.5 µg.m-3

90.4 percentile for daily values 34.7 µg.m-3

The EPA’s AG4 document in Appendix F states: “The “impact area” for the cumulative assessment is defined by the USEPA as a circular area with a radius extending from the source to the most distant point where dispersion modelling predicts a “significant” ambient impact will occur irrespective of pockets of insignificant impact occurring within it. Within this impact area, all nearby sources should be modelled, where “nearby” is defined as any point source expected to cause a significant concentration gradient in the vicinity”. Air emissions from the facility, when combined with air emissions from surrounding existing development including commercial and industrial facilities and road and rail traffic, could potentially cause a deterioration of ambient air quality. Baseline ambient air quality data for the region, which could be affected by emissions from the existing facility and existing development in the region shows that the annual mean value limits for PM2.5, PM10, NO2, NOX, SO2, CO and Lead, as prescribed in Air Quality Standards Regulations have not been exceeded. As such, it can be seen facility air emissions, in combination with air emissions from surrounding sources are not having a significant cumulative impact on air ambient air quality. There are no proposals to change operational processes on-site in a manner that would materially affect air emissions from the facility under the IE Licence Review. There is no further proposed development in the local area which would lead to a significant increase in air emissions affecting ambient air quality.

3.3 Sources

Site data was collected with regard to location, plan area, elevations and orientations of all buildings and structures present on site, as well as all the relevant characteristics of the AE-1 emission point. Building downwash was taken into account by the ADM.

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Figure 3-4 Site Layout

Treatment of Buildings

A number of significant buildings were included in the dispersion model. These buildings were

chosen on the basis that the height of each structure was at least 40% of the lowest stack

height.

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Figure 3-5 Building downwash visualisation

Table 3-6 Input Data - Provided by Metal Processors Ltd.

08/11/2017 22/05/2017 05/12/2016 24/05/2016 Avg Avg g/s

Particulates

g/hr

20.5 35.3 22.2 30 27.000 0.0075

Arsnenic 0.006 0.006 0.004 0.001 0.004 0.000001

Cadmium 0.007 0.006 0.005 0.001 0.005 0.000001

Copper 0.015 0.230 0.026 0.002 0.068 0.00002

Nickel 0.015 0.020 0.023 0.001 0.015 0.000004

Lead 0.169 0.138 0.084 0.006 0.099 0.00003

Antimony 0.008 0.004 0.004 0.001 0.004 0.000001

Tin 0.005 0.008 0.004 0.000 0.004 0.000001

Zinc 0.248 0.932 0.182 0.009 0.343 0.00010

Velocity m/s 9.4 10 8.9 11.4 9.925

Temp C 41 44 44 44 43.250

Flow [actual] m3/hr 16606 17721 15639 20132 17524.500

The AERMOD terrain pre-processor (AERMAP) provided the terrain data in USGS Digital Elevation Model DTM format. Base elevation is approx. 55 m throughout the site.

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Figure 3-7 Terrain plot

Meteorological Data

Met data was obtained by running the National Centre for Atmospheric Research’s MM5 (5th-generation Mesoscale Model) prognostic meteorological model for a specified location and site domain. Once the MM5 preprocessing was completed, the MM5 output file was converted into a format recognized by the AERMET model (meteorological preprocessor for the AERMOD model). The final output is generated by creating a pseudo met-station at the specified site location. The met files are described below:

Surface Met Data in SAMSON format

Upper Air Met Data in TD-6201 format

Hourly sequential data was supplied by Met Eireann for the years 2016, 2017 and 2018 at the

Casement Aerodrome weather station in Baldonnell, Co. Dublin which is approximately 3km

from the site. 2017 was chosen as the representative year after a review showed had the

highest average wind speed of the three years.

Year Average wind speed (Knots)

2018 9.7

2017 9.9

2016 9.2

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https://www.mmm.ucar.edu/mm5/mm5-home.html

http://www.webmet.com/MetGuide/Samson.html

http://www.webmet.com/MetGuide/TD6200.html



Figure 3-8 Wind rose

Figure 3-9 Wind profile in relation to site

As prescribed for the AERMOD model, the surface characteristics of the meteorological site,

i.e. Shannon Airport Station, were used. To prepare the meteorological data, appropriate

values for three surface characteristics: surface roughness length {zo}, albedo {r}, and Bowen

ratio {Bo} must be determined.

The surface roughness length is related to the height of obstacles to the wind flow and is, in

principle, the height at which the mean horizontal wind speed is zero based on a logarithmic

profile. The surface roughness length influences the surface shear stress and is an important

factor in determining the magnitude of mechanical turbulence and the stability of the

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boundary layer. The surface roughness was calculated using a 1km radius upwind of the

meteorological tower.

The albedo is the fraction of total incident solar radiation reflected by the surface back to

space without absorption. The daytime Bowen ratio, an indicator of surface moisture, is the

ratio of sensible heat flux to latent heat flux and is used for determining planetary boundary

layer parameters for convective conditions driven by the surface sensible heat flux. The Bowen

ratio and albedo were calculated based on a 10km grid.

3.4 Receptor Grid

The output of the model was gridded on a Uniform Cartesian Receptor Grid with 21x points

and 21y points and coordinates (UTM) as follows:

X Axis SW Coordinates 672583.89

Y Axis SW Coordinates 5911641.37

# Receptors 441

The grid extended over an area of 2,163m (X) × 1363m (Y), with its centre corresponding to

the approximate centre of the site.

Figure 3-10 Receptor grid

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4. Results

Table 4-1 Summary of Results

Pollutant Limit Value

Objective Averaging Time Contribution (µg/m³)

Particulates

as PM10

Pro

tect

ion

of

hu

man

hea

lth

90.4th percentile for daily

values

PC 0.52

BC 34.7

PEC 35.2

Limit value 50

Annual

PC 0.21

BC N/K

PEC N/K

Limit value 40

Arsenic Annual

PC <0.001

BC N/K

PEC <0.001

Target value 6

Cadmium Annual

PC <0.001

BC N/K

PEC <0.001

Target Value 5

Copper Annual

PC <0.001

BC N/K

PEC <0.001

Limit N/A

Nickel Annual

<0.001

N/K

PEC <0.001

Target Value 20

Lead Annual

PC <0.001

BC N/K

PEC <0.001

Limit value 0.5

Antimony Annual

PC <0.001

BC N/K

PEC <0.001

Limit N/A

Tin Annual

PC <0.001

BC N/K

PEC <0.001

Limit N/A

Zinc Annual

PC <0.001

BC N/K

PEC <0.001

Limit N/A

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5. Conclusion All parameters modelled are shown to be within the required limits. Considering the results, it is deemed that air emissions from the stack AE-1 on-site will have a negligible impact on ambient air quality.

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Appendix 1 Dispersion model results output file

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Appendix 2 Contour plots

24hr Particulates as PM10

Annual Particulates as PM10

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Arsenic annual

Cadmium Annual

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Copper Annual

Nickel Annual

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Lead Annual

Antimony Annual

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Tin Annual

Zinc Annual

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metal processors ae-1 stack emission point clondalkin, co. dublin · 2019. 11. 14. · metal...

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