NOISE MONITORING REPORT GALWAY METAL COMPANY LTD ... · Galway Metal Company Ltd (GMC) appointed...

O’Callaghan Moran & Associates Registration/VAT Number: 8272844U

NOISE MONITORING REPORT

GALWAY METAL COMPANY LTD

CARROWMONEASH,

ORANMORE

LICENCE NO. P1006-02

1ST QUARTER 2019

Prepared For: -

Galway Metal Company Ltd,

Carrowmoneash,

Oranmore,

County Galway

Prepared By: -

O’ Callaghan Moran & Associates,

Unit 15 Melbourne Business Park,

Model Farm Road,

Cork.

May 2019

Unit 15

Melbourne Business Park

Model Farm Road

Cork

E:[email protected]

www.ocallaghanmoran.com

T: 021 434 5366

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http://www.ocallaghanmoran.com/

i

Project Q1 2019 Noise Monitoring Report

Client Galway Metals Ltd (P1006-02) Report No Date Status Prepared By Reviewed By

191960301 07/05/2019 Draft Mr Billy

Hamilton MSc.

Mr Jim

O’Callaghan MSc

07/05/2019 Final Mr Billy

Hamilton MSc.

Mr Jim

O’Callaghan MSc

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ii Z:\19\196_Oranmetal Group\03_Monitoring\Q1\Noise\191960301.Doc May 2019 (BH/JOC)

TABLE OF CONTENTS

PAGE

1. INTRODUCTION ............................................................................................................ 1

1.1 MONITORING AND REPORTING REQUIREMENTS .......................................................... 1 1.2 CONTRIBUTORS TO THE REPORT ................................................................................. 1

2. NOISE MONITORING ................................................................................................... 2

2.1 LOCATIONS ................................................................................................................. 2

2.2 MONITORING ............................................................................................................... 2 2.3 DISCUSSION ................................................................................................................. 3

APPENDIX 1 - Noise Survey Report

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1. INTRODUCTION

Galway Metal Company Ltd (GMC) appointed O’Callaghan Moran & Associates (OCM) to

prepare a report on the annual noise monitoring specified in the Industrial Emissions Licence

(P1006-02) at its metals recycling facility at Carrowmoneash, Oranmore.

1.1 Monitoring and Reporting Requirements

The monitoring and reporting requirements are specified in Schedules C and Condition 6 of

the Licence. This report was prepared by Mr. Billy Hamilton MSc and reviewed by Mr Jim

O’Callaghan MSc. The report is accurate, and representative of the monitoring completed in

Q1 of 2019.

1.2 Contributors to the Report

• OCM was responsible for the preparation of this report.

• Damian Brosnan Accoustics carried out the noise monitoring.

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2. NOISE MONITORING

2.1 Locations

The licence requires annual monitoring at the four locations (NSL1, NSL2, NSL3 and NSL4)

locations detailed in Table 2.1 below and shown in Appendix 1 of the noise report.

Table 2.1: Noise Monitoring Locations

Station ITM NGR* Location Propagation route terrain

NSL1 138769

225736

20 m W of gate to bungalow 320 m

SE of site, at end of cul de sac

Free field; clear line of sight; terrain

level; route over pasture

NSL2 138830

226405

50 m S of turning circle at cluster

of dwellings 380 m NE of site;

SLM not located at turning circle

due to previous objection by local

resident

Free field; clear line of sight over

hedgerow, although much of yard

screened by onsite building; terrain

level; route over vegetated ground

with some trees

NSL3 138443

225721

15 m SE of cottage 320 m SSW of

site

Free field; clear line of sight; terrain

level; route over pasture

NSL4 138218

225671

NE corner of Maldron Hotel

carpark, 390 m SW of site

Free field; line of sight interrupted by

intervening buildings; terrain level;

route over pasture, paved ground and

roads.

2.2 Monitoring

The monitoring was carried out on 12th February 2019 by Damian Brosnan Acoustics (DBA).

The DBA report is in Appendix 1 and the results are presented in Table 2.2, which includes

the noise limit specified in the licence.

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Table 2.2: Noise Monitoring Results Summary

Station NSL1 NSL2 NSL3 NSL4

Period Day Day Day Day

Number of intervals 3 3 3 3

Interval T (minutes) 30 30 30 30

Ambient LAeq T (dB) 54-55 53-54 56-57 68

Facility audible ✓ ✓ ✓ x

Facility specific LAeq T (dB) <44 <41 <43 <50

Tone objectively detected x x x x

Tone attributable to facility x x x x

Facility audibly tonal x x x x

Facility audibly impulsive x x x x

Rating correction (dB) 0 0 0 0

Facility rated LAReq T (dB) <44 <41 <43 <50

Applicable parameter LAReq T LAReq T LAReq T LAReq T

Relevant result (dB) <44 <41 <43 <50

Limit (dB) 55 55 55 55

Compliance ✓ ✓ ✓ ✓

2.3 Discussion

Accurate calculation of GMC contributions at the four noise stations was prevented by road

traffic noise intrusion. Contributions were less than 44 dB at the three stations where GMC

emissions were audible. Levels in all cases were lower than the 55 dB daytime limit specified

in licence P1006-02.

GMC operations did not give rise to clearly audible tones or impulses at any measurement

station, thus complying with schedule B.4.

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APPENDIX 1

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project

Environmental noise survey in vicinity of

Galway Metal Company scrap metal processing installation

where

Carrowmoneash, Oranmore, Co. Galway

when

February 2019

why

IE licence P1006-02 compliance survey

client

O’Callaghan Moran & Associates OBO Galway Metal Company

prepared by

Damian Brosnan BSc MSc MIOA MIEI

report no. date status

018.5.1 21.02.19 Release to client

018.5.2 22.02.19 Corrected detail

086 813 1195 | damianbrosnan.com | [email protected] | © damian brosnan acoustics 2019

This report and its contents are copyright of damian brosnan acoustics. It may not be reproduced without permission. The report is to be used

only for its intended purpose. The report is confidential to the client, and is personal and non-assignable. No liability is admitted to third parties.

dB

A damian brosnan acoustics

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IE licence P1006-02 compliance noise survey Feb 2019 in vicinity of Galway Metal Company, Oranmore, GalwaydBA report 018.5.2

© damian brosnan acoustics 6

Contents

1 Introduction 5

2 Results 6

3 Conclusions 7

Appendix 1: Noise stations 8

Appendix 2: P1006-02 noise conditions 9

Appendix 3: Survey details 10

Appendix 4: Noise data 12

Appendix 5: Profiles 14

Appendix 6: Spectra 15

Appendix 7: Frequency data 17

Profile

This report was prepared by Damian Brosnan, who has the following qualifications and experience:

• BSc (Honours) 1993 (University College Cork).

• Postgraduate diploma in Acoustics & Noise Control 2009 (Institute of Acoustics).

• MSc (Distinction) in Applied Acoustics 2015 (University of Derby).

• Certificate of competence in workplace noise risk assessment (Institute of Acoustics).

• Member of Institute of Acoustics (MIOA) & secretary of Irish IOA branch.

• Founder member of Association of Acoustic Consultants of Ireland (AACI).

• Member of Engineers Ireland (MIEI).

• Engaged with continuing professional development through IOA & EI.

• Working in noise since 1996, and has worked on several hundred noise projects.

• 1996-2001: Noise Officer with Cork County Council.

• 2001-2014: Partner with DixonBrosnan Environmental Consultants, specialising in EIA.

• 2015--: Principal at Damian Brosnan Acoustics.

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Summary

On 12.02.19, Damian Brosnan Acoustics carried out an environmental noise survey in the vicinity of the Galway

Metal Company scrap metal processing installation at Carrowmoneash, Oranmore, Co. Galway. The survey is a

requirement of industrial emissions licence P1006-02 issued by the Environmental Protection Agency in respect of

the facility. Noise monitoring was undertaken at four stations specified in the licence. Operations were underway at

the facility throughout the survey.

Accurate calculation of facility contributions at the four noise stations was prevented by road traffic noise intrusion.

Contributions were less than 44 dB at the three stations where emissions were audible. Levels in all cases were

lower than the 55 dB daytime limit specified in licence P1006-02. Facility operations did not give rise to clearly

audible tones or impulses at any measurement station, thus complying with schedule B.4 of the licence.

Glossary

Ambient Total noise environment at a location, including all sounds present. Amplitude Maximum extent of oscillation in a noise signal. Greater amplitude results in louder signal. A-weighting Weighting or adjustment applied to sound level to approximate non-linear frequency response of human ear. Denoted by suffix A in parameters such as LAeq T, LAF10 T, etc. Background level A-weighted sound pressure level of residual noise exceeded for 90 % of time interval T. Denoted LAF90 T. Broadband Noise which contains roughly equal energy across frequency spectrum. Does not contain tones, and is generally less annoying than tonal noise. Decibel (dB) Unit of noise measurement scale. Based on logarithmic scale so cannot be simply added or subtracted. 3 dB difference is smallest change perceptible to human ear. 10 dB difference is perceived as doubling or halving of sound level. Examples of decibel levels are as follows: 20 dB: very quiet room; 30-35 dB: night-time rural environment; 55-65 dB: conversation; 80 dB: busy pub; 100 dB: nightclub. Throughout this report noise levels are presented as decibels relative to 20 µPa. Emissions Noise originating from source under consideration, spreading spherically, hemispherically or otherwise into surrounding environment. Extraneous Noise emissions unrelated to source under consideration. Fast response 0.125 seconds response time of sound level meter to changing noise levels. Denoted by suffix F in parameters such as LAF10 T, LAF90 T, etc. Free field Noise environment away from all surfaces other than ground ie. outside near field. Frequency Number of cycles per second of a sound or vibration wave. Low frequency noise may be perceived as hum, while whine represents higher frequency. Range of human hearing approaches 20-20,000 Hertz. Hertz (Hz) Unit of frequency measurement. Immissions Inward noise received at receptor, whether from all sources (ambient) or source under consideration (specific).

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Impulse Noise which is of short duration, typically less than one second, sound pressure level of which is significantly higher than background. Interval Time period T over which noise parameters are measured at position. Denoted by T in LAeq T, LAF90 T, etc. LAeq T Equivalent continuous sound pressure level during interval T, effectively representing average A-weighted noise level of ambient noise environment. LAF Instantaneous sound pressure level measured every 0.125 s. Highest level measured each second is displayed and recorded. Useful indicator in fluctuating noise environment. LAF10 T Sound pressure level exceeded for 10% of interval T, usually used to quantify traffic noise. LAF90 T Sound pressure level exceeded for 90% of interval T, usually used to quantify background noise. May also be used to describe noise level from continuous steady or almost-steady source, particularly where local noise environment fluctuates. LAReq T Rating noise level, derived from LAeq T plus specified adjustments for tonal and impulsive characteristics. Equivalent to LAr T used by EPA. Masking Rendering inaudible of one noise source by another source(s) which may be louder, or may contain significant acoustic energy in same part of frequency spectrum. In latter case, any tone(s) in original source emissions may become inaudible. Near field Noise levels recorded near walls or other surfaces, artificially increased due to reflections. Levels near walls may be increased by up to 3 dB, and up to 6 dB near corners. Free field conditions may be achieved by maintaining separation distance of at least 3.5 m from walls. Noise sensitive location Any dwelling house, hotel or hostel, health building, educational establishment, place of worship or entertainment, or any other facility or area of high amenity which for its proper enjoyment requires absence of noise at nuisance levels. 1/3 octave band Frequency spectrum may be divided into octave bands. Upper limit of each octave is twice lower limit. Each octave may be subdivided into thirds, allowing greater analysis of tones. Residual level Noise level remaining when specific source is absent or does not contribute to ambient. Sound pressure Deviation over ambient atmospheric pressure due to passing sound wave. Human ear is sound pressure detector, and thus acoustic parameters ultimately relate to sound pressure. Sound pressure level is ratio of measured sound pressure to reference value. Specific level LAeq T level produced by specific noise source under consideration during interval T, measured directly or by estimation or calculation. Tone Character of noise caused by dominance of one or more frequencies which may result in increased noise nuisance. Wind vector May be positive (+), negative (-), neutral (0) or crosswind (x). Positive wind vector blows from source to receptor, within angular range of ±45°, creating conditions more favourable to propagation. During certain conditions, this range may increase to ±60° by day and ±90° at night. Negative wind vector occurs when receptor is upwind of source. Neutral vector arises during still conditions, or upwind when in close proximity to source. Crosswinds >45° typically result in negative vector. Z-weighting Standard weighting applied by sound level meters to represent linear scale. Denoted by suffix Z in parameters such as LZeq T, LZF90 T, etc. used to describe 1/3 octave band levels in frequency spectra. In this report units are generally presented using US National Institute Of Standards & Technology guidelines.

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1 Introduction

1.1 Damian Brosnan Acoustics was instructed by O’Callaghan Moran & Associates, on behalf of their client Galway

Metal Company (GMC), to carry out an environmental noise survey in the vicinity of the GMC scrap metal processing

installation at Carrowmoneash, Oranmore, Co. Galway. Condition 6.16 of industrial emissions licence P1006-02,

issued 22.11.17 by the Environmental Protection Agency (EPA) in respect of the facility, specifies that such a survey

be undertaken at the request of the agency. The objectives of the survey were as follows:

• Undertake noise monitoring in accordance with International Standard ISO 1996-2:2017 Acoustics – Description,

measurement and assessment of environmental noise, Part 2: Determination of environmental noise levels (2017)

and EPA document NG4 Guidance note for noise: Licence applications, surveys and assessments in relation to

scheduled activities (2016).

• Measure noise levels at four offsite monitoring stations specified in licence P1006-02, shown in appendix 1.

• Assess measured levels in the context of noise criteria set out in the licence, reproduced in appendix 2.

1.2 The noise survey was undertaken Tuesday 12.02.19. As the GMC facility does not operate during evening or

night-time hours, the survey was confined to daytime hours in accordance with NG4. Survey methodology,

equipment specifications and weather conditions are listed in appendix 3.

1.3 Operations were underway at the GMC facility throughout the survey. Noise emissions arose from the following

onsite sources:

• Four mobile grabs in regular use, resulting in engine and metal manipulation noise.

• Fragmentation plant in almost continuous use from 0800 h.

• Several small mobile plant, including forklift trucks.

• Trucks, vans and cars intermittently accessing facility.

• The shears plant was not in use.

1.4 Condition 6.16 of licence P1006-02 specifies that the noise survey should include measurement of vibration. The

licence does not set out any vibration criteria or provide clarification on measurement methodology. Prior to the noise

survey, an inspection of the installation indicated that site operations were unlikely to give rise to measurable ground

borne vibration at offsite receptors. No indication of vibration was detected by the survey operator during the noise

survey. Measurement of ground borne vibration was therefore not considered necessary.

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2 Results

2.1 Noise data recorded are presented in appendix 4, and summarised in table 1 below. Time history profiles are

shown in appendix 5. Frequency spectra are shown in appendix 6 and tabulated in appendix 7. LAeq 30 min levels

specific to the GMC facility were determined using guidance set out in the NG4 document. At all stations, masking of

GMC emissions by road traffic precluded their accurate determination, and it was possible only to derive a ‘less than’

result.

Table 1: Noise data summary.

Station NSL1 NSL2 NSL3 NSL4

Period Day Day Day Day

Number of intervals 3 3 3 3

Interval T (minutes) 30 30 30 30

Ambient LAeq T (dB) 54-55 53-54 56-57 68

Facility audible ✓ ✓ ✓ x

Facility specific LAeq T (dB) <44 <41 <43 <50

Tone objectively detected x x x x

Tone attributable to facility x x x x

Facility audibly tonal x x x x

Facility audibly impulsive x x x x

Rating correction (dB) 0 0 0 0

Facility rated LAReq T (dB) <44 <41 <43 <50

Applicable parameter LAReq T LAReq T LAReq T LAReq T

Relevant result (dB) <44 <41 <43 <50

Limit (dB) 55 55 55 55

Compliance ✓ ✓ ✓ ✓

2.2 Road traffic noise entirely dominated the soundscape at all four stations, resulting in consistently elevated LAeq 30

min levels. Traffic noise entirely masked GMC emissions at NSL4, and masked most GMC emissions at the remaining

stations. Manipulation of metal by GMC grabs was intermittently audible at a low level at NSL1, NSL2 and NSL3,

resulting in specific LAeq 30 min levels below 44 dB. GMC immissions were thus markedly lower than the 55 dB daytime

LAeq 30 min limit specified in licence P1006-02. No emissions were audible at NSL4.

2.3 GMC operations did not give rise to any clearly audible tones or impulses at the measurement stations, thus

complying with schedule B.4. A non-tonal signal detected in the 50 Hz band at NSL2 may have originated from the

GMC facility.

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3 Conclusions

3.1 Accurate calculation of GMC contributions at the four noise stations was prevented by road traffic noise intrusion.

Contributions were less than 44 dB at the three stations where GMC emissions were audible. Levels in all cases

were lower than the 55 dB daytime limit specified in licence P1006-02.

3.2 GMC operations did not give rise to clearly audible tones or impulses at any measurement station, thus

complying with schedule B.4.

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Appendix 1: Noise stations

Station ITM NGR* Location Propagation route terrain

NSL1 138769 225736 20 m W of gate to bungalow 320 m SE of

site, at end of cul de sac

Free field; clear line of sight; terrain level; route

over pasture

NSL2 138830 226405 50 m S of turning circle at cluster of

dwellings 380 m NE of site; SLM not located

at turning circle due to previous objection by

local resident

Free field; clear line of sight over hedgerow,

although much of yard screened by onsite

building; terrain level; route over vegetated

ground with some trees

NSL3 138443 225721 15 m SE of cottage 320 m SSW of site Free field; clear line of sight; terrain level; route

over pasture

NSL4 138218 225671 NE corner of Maldron Hotel carpark, 390 m

SW of site

Free field; line of sight interrupted by

intervening buildings; terrain level; route over

pasture, paved ground and roads.

*Not verified in situ.

N

NSL1

NSL2

NSL3 NSL4

GMC

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Appendix 2: P1006-02 noise conditions

NOTE: It is understood that the licensee has been authorised to carry out certain activities from

0700 h

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Appendix 3: Survey details

Project

Project ref. 018

Client O’Callaghan Moran & Associates OBO Galway Metal Company

Location GMC Carrowmoneash Oranmore Galway

Stations Onsite: - Offsite: NSL1 NSL2 NSL3 NSL4

Microphone positions Free field 1.5 m above ground level

Time 12.02.19 0715-1230

Purpose IE licence P1006-02 compliance survey

Comment Facility operating

Operator Damian Brosnan BSc MSc MIOA MIEI

Standard ISO 1996 (2016 & 2017) EPA NG4 (2016)

Field calibrator Bruel & Kjaer Type 4231 Serial 2342544 Laboratory verification 16.01.18 by Sonitus Systems

Weather

Cloud cover 100 %

Precipitation Passing bands of light mist up to 1100

Temperature 10 °C

Wind direction SW

Wind speed 2-5 m/s

Wind measurement Anemo anemometer 2 m above ground level

Instrument 1

Stations used NSL1 NSL2

Instrument NTi XL2 (XL2-3) IEC 61672-1:2013 Class 1

SLM serial A2A-15392-E0

Microphone serial A16340 + pre-amp 7956 Standalone microphone: A16325 + pre-amp 7941

Range 20-120 dB

Intervals Logging at 1 s with audio Relevant intervals extracted

Time weighting Fast

Frequency weighting Broadband: A+C Spectrum: Z

Laboratory verification 13.12.18 by NTi Compliance certificate available on request

Field calibration 12.02.19 0709 @ 43.7 mV/Pa

Post survey drift check 93.9 dB

Instrument 2

Stations used NSL3 NSL4

Instrument NTi XL2 (XL2-4) IEC 61672-1:2013 Class 1

SLM serial A2A-15429-E0

Microphone serial A16329 + pre-amp 7945

Range 20-120 dB

Intervals Logging at 1 s with audio Relevant intervals extracted

Time weighting Fast

Frequency weighting Broadband: A+C Spectrum: Z

Laboratory verification 13.12.18 by NTi Compliance certificate available on request

Field calibration 12.02.19 0749 @ 41.8 mV/Pa

Post survey drift check 93.9 dB

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Uncertainty

Residual noise ui = 0.5 dB ci = 1 where source dominates, >20 where source becomes masked ciui range = 0.5 to >10 dB

Weather conditions Levels representative of contemporaneous conditions only ciui = 2 dB at wind vector + or x Otherwise ciui >2 dB

Anemometer height Not possible to measure wind speed at 10 m Anemometer height of 2 m may increase meteorological uncertainty

Precipitation Precipitation = 0 mm during reported intervals ciui = 0 dB

Operating conditions Levels representative of contemporaneous operating conditions only ciui <1 dB

Location ciui = 0 dB at free & far field positions ciui = 0.4 dB at near field positions

Instrument IEC 61672-1 class 1 specifications u = 0.5 dB.

Combined 3 dB to >10 dB, depending on position Variation chiefly to meteorology & residual noise intrusion

Expanded 6 dB to >10 dB, 95 % coverage

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Appendix 4: Noise data

Parenthesised numbers in table refer to following audibility scale: 1 Faintly discernible, audible with difficulty only. 2 Slightly

audible in background. 3 More clearly audible in background, but readily masked by other sources. 4 Becoming more prominent,

although not a dominant contributor. 5 Clearly audible when present, and one of the most significant contributors. 6 Chief

contributor to soundscape when present, although other sources still audible and contributing to LAeq T. 7 Dominant source when

present, almost entirely masking other sources, allowing LAeq T become representative of source depending on duration. 8 Entirely

dominant, completely masking all other sources when present. 9 Excessive, with short occurrences sufficient to influence LAeq T.

Station Date Time Wind

vector

LAeq T

dB

LAF10 T

dB

LAF90 T

dB

Specific

LAeq T dB

NSL1 day 1/3

12.02.19 1030-1100 - 54 56 52 <44

Facility: Metal manipulation occasionally audible (3-4).

Extraneous: Distant road traffic in several directions (6). Bird song/calls, aircraft. Lightly rustling vegetation

(3).

Specific LAeq T determination: Amplitude and occurrence insufficient to affect Leq. Highest LAF measured: 47

dB. Specific thus <44 dB at worst.

NSL1 day 2/3

12.02.19 1100-1130 - 55 56 52 <44

Facility: As previous.

Extraneous: As previous.

Specific LAeq T determination: As previous.

NSL1 day 3/3

12.02.19 1130-1200 - 54 55 52 <44




NSL2 day 1/3

12.02.19 0730-0800 + 53 54 51 <41

Facility: Metal manipulation occasionally audible (3).


(3).


dB. Thus <41 dB at worst.

NSL2 day 2/3

12.02.19 0800-0830 + 54 55 52 <41




NSL2 day 3/3

12.02.19 0830-0900 + 53 55 52 <41




NSL3 day 1/3

12.02.19 1030-1100 - 57 59 55 <43

Facility: Metal manipulation occasionally audible (3-4).


(3).


dB. Thus likely to be <43 dB at highest.

NSL3 day 2/3

12.02.19 1100-1130 - 57 59 54 <43




NSL3 day 3/3

12.02.19 1130-1200 - 56 59 54 <43




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Station Date Time Wind

vector

LAeq T

dB

LAF10 T

dB

LAF90 T

dB

Specific

LAeq T dB

NSL4 day 1/3

12.02.19 0800-0830 - 68 71 62 <50

Facility: Inaudible.

Extraneous: Passing road traffic continuous (8), with sporadic reduced periods due to level cross queuing.

Specific LAeq T determination: Inaudible. Considered highly likely to be significantly lower than 50 dB, based

on data measured at NSL3.

NSL4 day 2/3

12.02.19 0830-0900 - 68 71 64 <50




NSL4 day 3/3

12.02.19 0900-0930 - 68 71 63 <50




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Appendix 5: Profiles

NSL1 LAeq 1 s (dB)

NSL2 LAeq 1 s (dB)

NSL3 LAeq 1 s (dB)

NSL4 LAeq 1 s (dB)

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Appendix 6: Spectra

NSL1 Day 1/3 LZeq T (dB)






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Appendix 7: Frequency data

Frequency data are tabulated over as required by EPA document NG4 Guidance note for noise: Licence

applications, surveys and assessments in relation to scheduled activities (2016). Spectra are shown in appendix 6.

Tonality may be initially assessed using level differences suggested by annex K of International Standard ISO 1996-

2:2017 Acoustics – Description, measurement and assessment of environmental noise, Part 2: Determination of

environmental noise levels (2017) as follows:

• 15 dB in the third octave bands 25-125 Hz.



Level differences in the 10-160 Hz range which exceed the above criteria will not be of tonal significance if LZeq

values in those bands are lower than hearing threshold levels as follows:

Band (Hz) 10 12.5 16 20 25 31.5 40 50 63 80 100 125 160

LZeq (dB) 92 87 83 74 64 56 49 43 42 40 38 36 34

No tones were detected. Third octave band analysis detected acoustic energy in certain bands during several

intervals as follows, none of which was tonal when assessed using annex K:

Station Interval Band (Hz) Tonal Comment

NSL1 All 12.5 No Signal steady, and occasionally strong. Not of audible significance, as

below hearing threshold, and not detected by survey operator. Source

not identified. Signal also faintly evident at NSL2 and NSL4. Signal also

detected during 2017 and 2018 survey at all stations. Signal most likely

unrelated to GMC operations.

NSL2 Intervals 2 & 3 50 No Signal continuously present from 0803. Not of audible significance.

Possible related to GMC fragmentation plant, although this not

conclusive.

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Band (Hz) NSL1 LZeq T (dB) NSL2 LZeq T (dB) NSL3 LZeq T (dB) NSL4 LZeq T (dB)

1/3 2/3 3/3 1/3 2/3 3/3 1/3 2/3 3/3 1/3 2/3 3/3

Total A 54 55 54 53 54 53 57 57 56 68 68 68

6.3 67 63 66 76 77 74 83 83 85 80 78 77

8 64 62 63 74 76 73 81 82 83 78 77 76

10 62 59 61 72 74 71 80 80 81 76 75 74

12.5 68 69 69 70 75 73 78 79 80 75 74 74

16 57 56 57 68 69 65 76 75 77 72 71 70

20 55 55 55 65 66 63 73 73 74 70 69 68

25 57 57 57 62 63 60 70 70 71 69 68 68

31.5 57 58 57 59 62 59 67 67 69 69 68 67

40 55 56 57 56 59 58 64 65 66 68 68 67

50 56 57 57 55 70 69 62 63 64 71 70 70

63 54 55 54 55 56 57 59 59 60 70 69 68

80 51 51 51 50 52 52 55 56 56 64 65 64

100 47 48 48 47 50 48 51 52 53 60 60 60

125 46 45 47 45 47 46 49 49 51 59 58 58

160 46 45 47 41 43 42 46 47 48 56 57 56

200 46 45 47 38 39 37 44 45 45 57 56 56

250 45 45 46 38 41 39 44 44 45 58 57 57

315 44 43 44 40 43 41 44 45 45 57 57 56

400 43 43 43 41 45 43 45 45 45 56 56 55

500 43 43 43 44 46 45 47 47 46 57 58 57

630 44 44 44 44 46 46 48 48 48 58 58 58

800 46 46 46 46 47 47 51 51 50 60 61 60

1000 47 47 47 47 48 48 52 52 51 62 63 62

1250 44 44 44 43 44 44 49 48 48 60 60 59

1600 41 41 41 38 41 41 45 44 44 57 57 57

2000 39 38 38 34 38 37 40 40 40 53 54 54

2500 38 38 37 36 35 34 37 36 35 51 51 52

3150 38 43 37 37 34 31 32 32 31 48 49 50

4000 39 46 39 33 31 28 29 28 28 46 47 49

5000 38 43 36 35 29 26 27 26 26 45 46 48

6300 40 39 35 32 27 24 25 23 24 42 44 46

8000 42 41 40 26 27 27 24 21 22 43 43 45

10000 35 36 40 23 25 22 23 21 22 39 41 43

12500 25 27 27 24 26 22 22 20 22 42 40 42

16000 23 23 23 22 24 21 20 20 20 32 34 37

20000 20 20 20 21 22 20 20 20 20 25 29 29

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