environmental noise monitoring · noise emission limits as outlined in guidance note ... octave...

Allegro Acoustics Limited, Unit 2A Riverside, Tallaght Business Park, Tallaght, Dublin 24

Tel/Fax: +353 (0) 1 4140485

www.allegroacoustics.ie

ESB

West Offaly Power Station

ENVIRONMENTAL NOISE MONITORING

COMPLIANCE VERIFICATION FOR IEL P0611-02

27 May 2016

Report Author: Stephen Kearney

Report: DC1235-26

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Page | 2 DC1235-26 West Offaly Power Station 27/05/2016 Environmental Noise Monitoring

REPORT CONTROL

Document Title: Environmental Noise Monitoring

Project: West Offaly Power Station IEL Noise Assessment 2016

Client: Electricity Supply Board – West Offaly Power Station

Job Number: DC1235-26

File Origin: Z:\Allegro Acoustics\Projects\DC1235\Reports

Report Author: Stephen Kearney BEng MIEI

Signed:

Date: 27 May 2016

Issue Date Status Checked By Signed

1 18/05/2016 DRAFT David Cawley BE MSc CEng MIEI MIOA

2 27/05/2016 FINAL David Cawley BE MSc CEng MIEI MIOA

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TABLE OF CONTENTS

1 INTRODUCTION ............................................................................................................................... 4

2 SCOPE OF WORKS ........................................................................................................................... 4

3 NOISE MONITORING METHODOLOGY ............................................................................................ 4

3.1 Noise Monitoring Locations .................................................................................................... 4

3.2 Survey Instrumentation and Methodology............................................................................. 5

3.3 Assessment Criteria ................................................................................................................ 5

3.4 Determination of the Rated Noise Level ................................................................................. 5

3.5 Determination of Tonal Character .......................................................................................... 6

3.6 Meteorological and Local Environmental Conditions ............................................................. 6

4 RESULTS........................................................................................................................................... 7

4.1 Noise Measurements .............................................................................................................. 7

5 DISCUSSION ..................................................................................................................................... 7

5.1 NSL1 – St. Kieran’s Park........................................................................................................... 7

5.2 NSL2 – Junction to Power Station Entrance ............................................................................ 8

5.3 NSL3 – Old Fort Restaurant ..................................................................................................... 8

6 CONCLUSION ................................................................................................................................... 9

7 REFERENCES .................................................................................................................................. 10

APPENDICES

Appendix A - Leq and L90 1/3rd Octave Frequency Band Data and Graphs

Appendix B - Glossary of Noise Terminology

Appendix C - Calibration Certification

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1 INTRODUCTION

Allegro Acoustics was retained by ESB – West Offaly Power Station to undertake day, evening and night time environmental noise monitoring at three locations in the vicinity of the West Offaly Power Station in Shannonbridge, County Offaly. The Power Station is located on the R357 regional road, in Shannonbridge, County Offaly. There are a number of residences located near the Power Station, these are outlined in Table 1 below and in Figure 1 below.

2 SCOPE OF WORKS

Noise monitoring was undertaken to verify compliance or otherwise with Industrial Emissions License P0611-02 for the Power Station. Cognisance was also paid to the methodologies and noise emission limits as outlined in Guidance Note for Noise: License Applications, Surveys and Assessments in Relation to Scheduled Activities (NG4) [1].

Noise monitoring was undertaken on the 12th and 13th of May 2016. This report presents the results of the noise monitoring and discusses the findings.

3 NOISE MONITORING METHODOLOGY

3.1 Noise Monitoring Locations

Noise monitoring was undertaken at three locations during day, evening and night time. The noise measurement locations are detailed in Table 1 and outlined on a map in Figure 1 below.

Monitoring Point Location Location Type

NSL 1 Rear of house in St Kieran’s Park, residential housing estate on R357, closest dwellings to Power Station

Residential

NSL 2 Junction of station entrance road and R357 at Church. Amenity

NSL 3 Northwest of site in car park of ‘Old Fort’ restaurant Amenity

Table 1: Description of noise measurement locations.

Figure 1: Noise monitoring locations NSL1 to NSL3 with the West Offaly Power Station towards the bottom.

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3.2 Survey Instrumentation and Methodology

The precise noise monitoring locations were chosen according to the guidelines in Guidance Note for Noise: NG4 [1] and ISO 1996: Acoustics – Description and Measurement of Environmental Noise [2]. In all cases, the sound level meter (SLM) was mounted on a tripod at 1.5m above ground level and at least 3.5m away from any sound reflecting surfaces. The SLM was oriented towards the Power Station of interest for each measurement taken. A Bruel and Kjaer UA-1650 windshield with auto detect was placed on the microphone to reduce any wind interference during measurements.

The measurements were made using an NTI Audio XL2 Sound Level Meter (SLM) which measures simultaneously in every 1/3rd octave frequency band from 12.5Hz to 20 kHz. The SLM was calibrated before, during and after the noise monitoring survey was carried out using a Bruel and Kjaer acoustic calibrator. Calibration certification, SLM serial number, calibrator used and microphone serial number for the SLM are presented in the factory calibration certificate as displayed in Appendix C. The NTI Audio XL2 SLM is a Class 1 instrument in accordance with IEC 61672 regulations. The Time Weighting used was Fast and the Frequency Weighting was A-weighted as per IEC 61672. A glossary of noise related terms is presented in Appendix B.

The primary measurement parameter was the equivalent continuous A-Weighted Sound Pressure Level, LAeq,T. A statistical analysis of the measurement results was also completed so that the percentile levels, LAN,T for N = 1%, 5%, 10%, 50%, 90%, 95% and 99% over each measurement were recorded. The percentile levels represent the noise level in dB(A) exceeded for N% of the measurement time. LA10 values are used to describe intermittent, high-energy noise events such as road traffic whereas LA90 values are representative of background noise levels. 1/3rd octave graphs for all noise measurements is presented in Appendix A.

3.3 Assessment Criteria

The recommended noise limit criteria as outlined in Guidance Note for Noise (NG4) [1] has been referenced for the purposes of this assessment. This document outlines the following recommended noise limits for areas which do not display particularly low background noise levels:

Daytime Noise Criterion, dB LAr,T (07:00 to 19:00hrs): 55dB

Evening Noise Criterion, dB LAr,T (19:00 to 23:00hrs): 50dB

Night-time Noise Criterion, dB LAeq,T (23:00 to 07:00hrs): 45dB

The LAr,T indicator refers to the Rated Noise Level which is equal to the measured LAeq,T with any penalties added due to impulsive or tonal characteristics. Hence, without such penalties, the Rated Noise Level is equal to the measured LAeq,T; assuming that this measured level is attributable solely to the Power Station in question. The derivation of the Rated Noise Level is discussed in Section 3.4 below.

3.4 Determination of the Rated Noise Level

The Rated Noise Level, LAr,T is defined in Guidance Note for Noise (NG4) [1] as follows:

The Rated Noise Level, equal to the LAeq during a specified time interval (T), plus specified adjustments for tonal character and / or impulsiveness of sound.

In order to determine the Rated Noise Level, the LAeq or specific noise level for the Power Station must firstly be determined. This is normally the measured LAeq,T for the Power Station.

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However, as measured noise levels take all audible noise into consideration, the measured noise level can often include the noise generated by other sources such as passing road traffic and localised people movements. In such instances, the measured LAeq,T cannot be attributed solely to the Power Station in question.

Depending on the nature of noise generated by a Power Station, statistical analysis can be used to determine the specific noise level attributable solely to the Power Station at each measurement location. In the simplest case, where audible noise from a Power Station is constant and does not include intermittent or impulsive characteristics, the measured background noise level depicted by the LA90 statistical indicator can be considered to be representative of the specific noise level attributable to the Power Station. The LA90 statistical indicator is recognised as being representative of the background noise level at a location. This indicator is defined as follows:

The noise level that is equalled or exceeded for 90% of the time – the L90 statistical noise indicator is an indicator of the constant background noise level at any location.

Where the specific audible noise from a Power Station is constant and does not include any noticeable intermittent or impulsive noise, the LA90 is therefore deemed suitable to depict the specific noise level from such a Power Station whereby there are no other dominant sources of constant noise at the measurement location. In the case of the West Offaly Power Station, the LA90 can be considered representative of the specific noise level from the Power Station.

3.5 Determination of Tonal Character

The LA90 and LAeq values in each 1/3rd octave frequency band as displayed in Appendix A were analysed to determine if the measured noise from the Power Station is tonal at any of the three noise monitoring locations. The determination of tonality can be concluded by determining if one particular 1/3rd octave frequency band exceeds both its adjacent 1/3rd octave frequency bands by a significant number of decibels. The following guidelines are outlined in Guidance Note for Noise (NG4) [1] to conclude a tonal characteristic to the specific noise emanating from a Power Station:

Referring to the sound pressure levels in each 1/3rd octave band: The appropriate level differences vary with frequency. They should be greater than or equal to the following values in both adjacent 1/3rd octave bands:

15dB in low-frequency 1/3rd octave bands (25Hz to 125Hz)

8dB in middle-frequency bands (160Hz to 400Hz)

5dB in high-frequency bands (500Hz to 10,000Hz)

3.6 Meteorological and Local Environmental Conditions

There was no precipitation during noise measurements on the 12th and 13th of May 2015. The ground was dry throughout all measurements. There was a slight north easterly breeze observed to be present during the day and evening time measurements. The wind speed and temperature was measured during each noise measurement using a Skywatch Explorer 2 hand held anemometer. During all measurements, the average wind speed and occasional gusts were observed to remain below 5m/s. Air temperatures were observed to range from 12˚C to 18˚C during day, evening and night time measurements. There was no mist or fog observed during noise measurements with conditions being described as “clear”.

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4 RESULTS

4.1 Noise Measurements

The results for the day, evening and night time noise monitoring survey are presented in Table 2 below. The 1/3rd octave band spectrums for the LAeq and LA90 of each measurement are displayed in Appendix A.

Location Meas Start Time Period Duration LAeq LA90 LA10 LAmax LAmin

dB dB dB dB dB

NSL1

1 12/05/2016 15:03 Day 1 00:30:00 50.6 43.3 53.5 67.8 37.4

4 12/05/2016 16:54 Day 2 00:30:00 49.3 42.6 52.2 67.1 36.8

7 12/05/2016 19:01 Eve 00:30:00 48.6 41.5 51.4 66.8 34.1

10 12/05/2016 23:00 Night 1 00:30:00 38.6 28.9 40.8 61.7 26.3

13 13/05/2016 00:43 Night 2 00:30:00 35.5 28.2 38.4 57.1 26.4

NSL2

2 12/05/2016 15:37 Day 1 00:30:00 57.5 44.3 55.9 83.4 40.1

5 12/05/2016 17:27 Day 2 00:30:13 56.4 43.1 54.2 82 38.3

8 12/05/2016 19:38 Eve 00:30:00 57.7 43.2 56.6 83.8 37.5

11 12/05/2016 23:35 Night 1 00:30:00 43 31.6 41.9 65.2 29.7

14 13/05/2016 01:16 Night 2 00:30:00 40.6 32.9 37.8 68.3 31.1

NSL3

3 12/05/2016 16:19 Day 1 00:30:00 52.7 43.9 56.3 69 40.1

6 12/05/2016 18:09 Day 2 00:30:00 54.6 44.3 57.1 73.7 40.7

9 12/05/2016 20:13 Eve 00:30:00 53.2 41.7 53.5 76.1 38.6

12 13/05/2016 00:09 Night 1 00:30:00 42.2 37.5 44.2 61.5 36.4

15 13/05/2016 01:51 Night 2 00:30:00 40.2 35.7 41 62.4 34

Table 2: Summary of Noise Monitoring Survey Results.

5 DISCUSSION

5.1 NSL1 – St. Kieran’s Park

This monitoring location represents a noise sensitive residential location. This location is situated to the rear of a residence in St. Kieran’s Park; a housing estate adjacent to the R357 regional route.

The dominant noise source at this location was observed to be traffic from the adjacent R357 and the surrounding road network. Additional noise sources included birdsong and a lawnmower operating in the distance. A low level hum was audible from the Power Station during lulls in traffic.

The LAeq for the day time round 1 and 2 measurements was 50.6dB and 49.3dB respectively. The LAeq for the evening time measurements was 48.6dB. The LAeq for the night time round 1 and 2 measurements was 38.6dB and 35.5dB respectively. The measured LAeq noise levels are below the day, evening and night time noise limits of 55dB, 50dB and 45dB LAeq as set out in IEL P0611-02 for the Power Station.

Due to the constant and steady nature of noise generated by the Power Station, the LA90 as discussed in Section 3.4 above can be referenced to determine the specific noise level from the Power Station at this location. The LA90 for the day time round 1 and 2 measurements was 43.3dB and 42.6dB respectively. The LA90 for the evening time measurements was 41.5dB. The LA90 for the night time round 1 and 2 measurements was 28.9dB and 28.2dB respectively. The measured LA90 noise levels are below the day, evening and night time noise limits of 55dB, 50dB and 45dB LA90 as set out in IEL P0611-02 for the Power Station.

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By viewing the 1/3rd octave band spectrums for the day, evening and night time measurements in Appendix A, it can be seen that the Leq at each 1/3rd octave band does not exceed adjacent bands by the allowable margin as outlined in Section 3.4. Therefore, the measured noise at this location is not deemed to be tonal in character.

The noise impact on this location due to the Power Station is therefore considered to comply with the noise limits as set out in IEL P0611-02 for the Power Station.

5.2 NSL2 – Junction to Power Station Entrance

This location is situated at a Church, at the junction between the R357 and the road leading up to the entrance to the Power Plant.

The dominant noise source at this location was observed to be traffic from the adjacent R357, HGV's and cars along the access road to the Power Station and traffic from the surrounding road network. Additional noise sources included birdsong. The power station was audible as a low level hum during lulls in traffic.

The LAeq for the day time round 1 and 2 measurements was 57.5dB and 56.4dB respectively. The LAeq for the evening time measurements was 57.7dB. The LAeq for the night time round 1 and 2 measurements was 43dB and 40.6dB respectively. The measured LAeq noise levels are above the day and evening noise limits of 55dB and 50dB LAeq as set out in IEL P0611-02 for the Power Station. However, a major contributor to measured LAeq levels at this location was observed to be road traffic along the R357 and road traffic along the access road to the Power Station.


By viewing the 1/3rd octave band spectrums for the day, evening and night time measurements in Appendix A, it can be seen that the Leq at each 1/3rd octave band does not exceed adjacent bands by the allowable margin as outlined in Section 3.4. Therefore, the measured noise at this location is not deemed to be tonal in character.


5.3 NSL3 – Old Fort Restaurant

This location is situated in the car park of the ‘Old Fort’ restaurant. The dominant noise source at this location was observed to be traffic from the adjacent R357 and the surrounding road network. Additional noise sources included birdsong and leaves rustling. The power station was audible as a low level hum during lulls in traffic.

The LAeq for the day time round 1 and 2 measurements was 52.7dB and 54.6dB respectively. The LAeq for the evening time measurements was 53.2dB. The LAeq for the night time round 1 and 2 measurements was 42.2dB and 40.2dB respectively. The measured LAeq noise levels are above the evening noise limits of 50dB LAeq as set out in IEL P0611-02 for the Power Station. However, a major contributor to measured LAeq levels at this location was observed to be road traffic along the R357.

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By viewing the 1/3rd octave band spectrums for the day, evening and night time measurements in Appendix A, it can be seen that the Leq at one 1/3rd octave band exceeds the adjacent bands by the allowable margin as outlined in Section 3.4 at 160Hz during the first day time, evening time and first night time measurements.

A tonal assessment was carried out on the 25th of May 2016 and a report entitled “DC1521-01 West Offaly Power Station Tonal Assessment” and was issued to ESB on the 27th of May 2016. This report includes a comprehensive assessment of noise levels in the 160Hz 1/3rd octave frequency band at NSL3 and throughout the Power Station. This assessment concludes that the source of the tonal component is an electric hum from within a nearby palisade fence enclosure at the restaurant and not the Power Station. The tonal component in the 160Hz 1/3rd octave frequency band in not deemed to be attributable to the Power Station.


6 CONCLUSION

In conclusion to the measurement and assessment of environmental noise as a result of the operation of the West Offaly Power Station, it has been concluded that the specific noise level from the Power Station at each measurement location remains below the day, evening and night time limits as outlined in IEL P0611-02.

While measured LAeq levels at some measurement locations have been shown to be in excess of day, evening and night time IEL noise limits on occasion; such levels are not deemed to be attributable to the West Offaly Power Station.

Due to the constant nature of noise emanating from the Power Station, the LA90 noise indicator; typically used to determine the background noise level at a location; was used to depict the specific noise level from the Power Station. It can be seen from Table 2 above that all measured LA90 values are below the day, evening and night time noise limits as outlined in IEL P0611-02 for each period.

By viewing the 1/3rd octave band noise spectrums for day, evening and night time measurements at noise measurement locations, tonal components were measured at NSL3. These tonal components are not deemed to be attributable to the Power Station and are attributed to an electrical hum from within a palisade fence enclosure at the Old Fort restaurant.

The day, evening and night time noise limits as set out in IEL P0611-02 for the West Offaly Power Station are not considered to have been breached at the nearest noise sensitive locations by noise emanating from the Power Station. It is therefore concluded that the West Offaly Power Station at Shannonbridge, Co. Offaly is considered to be demonstrating compliance with the noise limits outlined for the Power Station in IEL P0611-02.

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7 REFERENCES

[1] Guidance Note for Noise: License Applications, Surveys and Assessments in Relation to Scheduled Activities (NG4) ENVIRONMENTAL PROTECTION AGENCY: 2016

[2] ISO 1996 Acoustics – Description and Measurement of Environmental Noise

INTERNATIONAL STANDARDS ORGANISATION: 2003

[3] Guidelines for Community Noise WORLD HEALTH ORGANISATION: 2000

[4] BS4142 Methods for rating and assessing industrial and commercial sound BRITISH STANDARDS: 2014

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Appendix A

Leq and L90 1/3rd

Octave Frequency Band Data and Graphs

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MyCount

Elapsed LZeq LZeq LZeq LZeq LZeq LZeq LZeq LZeq LZeq LZeq LZeq LZeq LZeq LZeq LZeq LZeq LZeq LZeq LZeq LZeq LZeq LZeq LZeq LZeq LZeq LZeq LZeq LZeq LZeq LZeq LZeq LZeq LZeqTime 12.5Hz 16Hz 20Hz 25Hz 31.5Hz 40Hz 50Hz 63Hz 80Hz 100Hz 125Hz 160Hz 200Hz 250Hz 315Hz 400Hz 500Hz 630Hz 800Hz 1 kHz 1.25 kHz 1.6 kHz 2 kHz 2.5 kHz 3.15 kHz 4 kHz 5 kHz 6.3 kHz 8 kHz 10 kHz 12.5 kHz 16 kHz 20 kHz

Day 1 1 12/05/2016 15:03 00:30:00 68 65.7 63.1 61 57.4 54.2 53.5 51.8 47.3 46.7 43.8 41.6 41.2 39.5 39.4 39.5 40.2 40.3 40.6 41 40.1 40.4 39.3 36.7 37.7 39.8 37.5 32.4 27.6 24.3 20.9 17.8 16.1Day 2 4 12/05/2016 16:54 00:30:00 62.4 60.2 57 55.3 51.9 50.1 51.5 50.4 45.4 43.8 42.9 42.1 39.4 39.4 37.5 36.8 37.1 37.7 38.8 39.5 38.9 39.8 38.8 36.1 36.4 38.1 36.7 32.5 25.9 21.7 19.6 17.6 16.9Eve 7 12/05/2016 19:01 00:30:00 62.2 59.2 56.4 54.4 50.2 49.6 51.6 48.9 49.5 51.9 45.6 41.1 40.4 35.6 35 35.4 36.2 36.1 37.1 37.8 37.9 39.2 38.8 34.7 36.2 38.7 34.1 27.9 23 18.4 15.6 14.7 15.1Night 1 10 12/05/2016 23:00 00:30:00 58.9 56.5 53.5 51.4 48 44.7 46.2 42.8 40.7 40 33.4 36.6 29.6 27.5 27.3 27.7 28.8 29.5 30.8 31.1 29.7 28.1 25.9 23.2 21.4 17.8 14.8 13.1 12.5 12.6 13.6 14.1 20.1Night2 13 13/05/2016 00:43 00:30:00 58.6 56 53.3 51.5 47.5 42.3 41.4 40 38 34.6 30.3 34.6 28.3 27.2 26.1 25.6 25 26 27.6 27.8 26 24.2 22.1 21.2 19.5 17 14.8 13.9 12.8 12.6 12.8 13.9 16.9Day 1 2 12/05/2016 15:37 00:30:00 67.1 65 62.2 60 59.3 58.8 68.2 67.8 52.6 51.9 50.7 47.6 49.1 48 46.8 48.2 49.3 48.6 49.3 49.9 47.5 46.4 45.6 43.2 41.6 38.9 35.2 31.6 33.8 25.9 23.4 21.1 17.2Day 2 5 12/05/2016 17:27 00:30:00 57.3 58.9 53.8 56.2 51.7 52.7 68.6 65.3 51.7 49.9 47.1 47.4 45.6 44.2 45.9 45.5 45.4 50.7 50.6 47.9 46.4 44.9 42.1 40.1 38.2 35.7 32.9 29.9 26.2 22.3 20 21.2 15.8Eve 8 12/05/2016 19:38 00:30:00 56.5 55.6 53.7 55.1 52.6 53.1 57.7 61.2 62.8 52.7 52.9 52.8 49.6 47.6 46.9 49.2 49.3 47.9 48.5 48.8 46.5 47.1 46.5 46.8 43.6 40.4 36.8 33.5 31.8 27.1 23 21.2 16.5Night 1 11 12/05/2016 23:35 00:30:00 56.6 55.4 53.6 54.1 50.6 44.6 48.1 44.1 39.8 36.4 36.6 39.9 33.8 34.7 33.5 31.7 32.8 33.8 36.1 37.7 34.3 30.5 27.6 23.9 20.1 17.4 15.8 16.4 16.8 14.4 14.1 14.2 15.4Night2 14 13/05/2016 01:16 00:30:00 56.9 54 54 52.7 50.6 48.2 49.7 45.4 40.4 38.8 35.8 36.4 32.7 32.8 31.2 32.1 31.5 31.6 33.9 34.1 30.7 27.6 25.4 23.5 22.1 21.6 18.2 14.7 14.1 13.6 13.5 14.1 19.5Day 1 3 12/05/2016 16:19 00:30:00 73.5 71.2 68.9 66.1 63.4 60.4 60.7 58.6 54.8 50.8 47.9 50.1 46.6 46.7 44.9 44.5 44.4 43.6 44 44.1 42.4 41.3 39.8 37.7 36 38.6 31.5 28.6 25.6 21.3 17.4 15 15Day 2 6 12/05/2016 18:09 00:30:00 68.7 66.4 64.5 63.9 59.4 60 66.8 62.7 53.7 54.7 55.1 50.8 49 47.6 45.7 47.2 47.6 46 45.7 45.7 44.4 42.8 41.6 39.8 37.8 36.4 32.2 31.9 28.2 21.3 17.3 15.2 15Eve 9 12/05/2016 20:13 00:30:00 59 57.2 58.7 56.3 54.6 54.6 59.7 60.4 52 47.9 48.4 49.3 44.4 44.4 44 42.7 44.9 43.3 43.1 44.3 42.5 44 42.6 40 37.7 36.2 34.8 32.3 29.2 31.9 24.7 15.4 15.7Night 1 12 13/05/2016 00:09 00:30:00 58.4 53.9 57.3 51.6 50.9 45.9 48.1 43.7 42.1 45.9 36.4 49.5 36.2 35.8 33.5 33.1 33.3 33 32.6 32.9 31.6 30.7 27.3 23.4 20.3 18.3 15.7 14.1 13.5 13.1 13.1 13.9 15.9Night2 15 13/05/2016 01:51 00:30:00 59.4 54.9 57.5 50.6 51.7 44.5 46.9 42.5 41.3 47.5 35.2 42.7 37.8 34.9 32.3 33.5 32.2 31.8 31.6 31 29.4 28 24.1 21.1 18.2 16.2 15.4 15.4 16.5 18.3 19.1 16.9 16.6

Elapsed LZ90 LZ90 LZ90 LZ90 LZ90 LZ90 LZ90 LZ90 LZ90 LZ90 LZ90 LZ90 LZ90 LZ90 LZ90 LZ90 LZ90 LZ90 LZ90 LZ90 LZ90 LZ90 LZ90 LZ90 LZ90 LZ90 LZ90 LZ90 LZ90 LZ90 LZ90 LZ90 LZ90Time 12.5Hz 16Hz 20Hz 25Hz 31.5Hz 40Hz 50Hz 63Hz 80Hz 100Hz 125Hz 160Hz 200Hz 250Hz 315Hz 400Hz 500Hz 630Hz 800Hz 1 kHz 1.25 kHz 1.6 kHz 2 kHz 2.5 kHz 3.15 kHz 4 kHz 5 kHz 6.3 kHz 8 kHz 10 kHz 12.5 kHz 16 kHz 20 kHz

Day 1 1 12/05/2016 15:03 00:30:00 53.4 51.4 49.4 49.4 44.4 41.4 42.4 39.4 38.4 37.4 34.4 34.4 32.4 32.4 31.4 31.4 31.4 31.4 31.4 31.4 31.4 30.4 29.4 26.4 27.4 26.4 24.4 21.4 17.4 14.4 13.4 13.4 14.4Day 2 4 12/05/2016 16:54 00:30:00 52.4 51.4 48.4 48.4 43.4 40.4 39.4 37.4 36.4 33.4 30.4 31.4 28.4 28.4 28.4 28.4 28.4 29.4 29.4 30.4 29.4 29.4 28.4 26.4 26.4 25.4 23.4 20.4 15.4 13.4 13.4 13.4 14.4Eve 7 12/05/2016 19:01 00:30:00 53.4 51.4 48.4 47.4 43.4 39.4 40.4 38.4 38.4 36.4 33.4 34.4 31.4 29.4 27.4 26.4 27.4 27.4 27.4 27.4 28.4 27.4 27.4 25.4 25.4 23.4 20.4 16.4 13.4 12.4 12.4 13.4 14.4Night 1 10 12/05/2016 23:00 00:30:00 52.4 49.4 47.4 45.4 42.4 39.4 38.4 35.4 34.4 30.4 26.4 30.4 23.4 21.4 20.4 19.4 18.4 18.4 17.4 15.4 15.4 14.4 11.4 10.4 9.4 9.4 9.4 10.4 10.4 11.4 12.4 13.4 14.4Night2 13 13/05/2016 00:43 00:30:00 52.4 49.4 47.4 46.4 42.4 37.4 35.4 34.4 33.4 29.4 24.4 29.4 23.4 22.4 21.4 20.4 17.4 17.4 14.4 13.4 12.4 11.4 9.4 8.4 8.4 8.4 9.4 10.4 10.4 11.4 12.4 13.4 14.4Day 1 2 12/05/2016 15:37 00:30:00 53.4 52.4 49.4 49.4 51.4 51.4 45.4 43.4 40.4 37.4 36.4 36.4 34.4 34.4 34.4 34.4 34.4 33.4 33.4 34.4 33.4 32.4 30.4 27.4 26.4 25.4 22.4 18.4 15.4 13.4 13.4 13.4 14.4Day 2 5 12/05/2016 17:27 00:30:00 48.4 51.4 46.4 49.4 44.4 43.4 44.4 42.4 38.4 35.4 35.4 34.4 34.4 34.4 33.4 33.4 33.4 32.4 31.4 32.4 31.4 31.4 29.4 25.4 24.4 22.4 18.4 14.4 13.4 12.4 12.4 13.4 14.4Eve 8 12/05/2016 19:38 00:30:00 49.4 49.4 47.4 48.4 45.4 41.4 45.4 42.4 39.4 36.4 36.4 35.4 36.4 35.4 31.4 32.4 30.4 29.4 29.4 30.4 30.4 30.4 30.4 26.4 23.4 21.4 16.4 12.4 11.4 11.4 12.4 13.4 14.4Night 1 11 12/05/2016 23:35 00:30:00 49.4 49.4 47.4 47.4 45.4 39.4 43.4 39.4 35.4 31.4 32.4 36.4 28.4 28.4 26.4 22.4 21.4 18.4 16.4 16.4 16.4 13.4 10.4 9.4 8.4 8.4 9.4 10.4 10.4 11.4 12.4 13.4 14.4Night2 14 13/05/2016 01:16 00:30:00 49.4 48.4 47.4 46.4 45.4 41.4 44.4 40.4 35.4 32.4 32.4 33.4 29.4 29.4 26.4 28.4 24.4 23.4 19.4 18.4 17.4 15.4 12.4 12.4 9.4 9.4 9.4 10.4 10.4 11.4 12.4 13.4 14.4Day 1 3 12/05/2016 16:19 00:30:00 56.4 53.4 54.4 49.4 48.4 44.4 45.4 41.4 38.4 41.4 36.4 46.4 36.4 34.4 34.4 34.4 33.4 33.4 32.4 32.4 30.4 30.4 29.4 27.4 25.4 24.4 20.4 17.4 14.4 13.4 12.4 13.4 14.4Day 2 6 12/05/2016 18:09 00:30:00 53.4 51.4 53.4 49.4 48.4 45.4 47.4 44.4 42.4 40.4 38.4 44.4 37.4 36.4 33.4 34.4 34.4 34.4 33.4 33.4 31.4 30.4 29.4 26.4 23.4 21.4 18.4 14.4 12.4 12.4 12.4 13.4 14.4Eve 9 12/05/2016 20:13 00:30:00 50.4 47.4 50.4 48.4 44.4 43.4 41.4 37.4 35.4 38.4 30.4 46.4 35.4 31.4 29.4 31.4 30.4 31.4 30.4 27.4 26.4 25.4 26.4 24.4 23.4 21.4 17.4 12.4 11.4 11.4 12.4 13.4 14.4Night 1 12 13/05/2016 00:09 00:30:00 51.4 48.4 51.4 45.4 45.4 39.4 42.4 36.4 33.4 42.4 28.4 48.4 31.4 28.4 25.4 25.4 25.4 26.4 23.4 21.4 20.4 18.4 15.4 12.4 9.4 9.4 9.4 10.4 10.4 11.4 12.4 13.4 14.4Night2 15 13/05/2016 01:51 00:30:00 52.4 49.4 52.4 44.4 46.4 39.4 41.4 37.4 35.4 43.4 29.4 40.4 34.4 30.4 26.4 28.4 26.4 26.4 24.4 22.4 20.4 19.4 15.4 13.4 10.4 9.4 9.4 10.4 10.4 11.4 11.4 13.4 14.4

Testing Agency:Testing Operator:SLM:SLM Serial Number:

Allegro AcousticsStephen Kearney BEng MIEINTI Audio - XL2 A2A-09612-E0

Bandwidth:Time Weighting:

1/3rd Octave - Fully IntegratingFast

SLM Factory Calibration Date:Sound Field Correction:

18/06/2015Free Field

dB Leq Measurement DataLocation Start TimeMeasurementPeriod

NSL1

NSL2

NSL3

dB L90 Measurement DataLocation Period Measurement Start Time

NSL1

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NSL3

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EPA Export 02-08-2016:01:47:24

Figure A1: NSL1 Day time 1/3rd Octave Band Frequency Analysis


Figure A3: NSL1 Eve time 1/3rd Octave Band Frequency Analysis

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EPA Export 02-08-2016:01:47:24

Figure A4: NSL1 Night time 1/3rd Octave Band Frequency Analysis



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EPA Export 02-08-2016:01:47:24




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05

101520253035404550556065

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5Hz

16

Hz

20

Hz

25

Hz

31

.5H

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40

Hz

50H

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63

Hz

80

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0H

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12

5H

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16

0H

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200

Hz

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0H

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31

5H

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0H

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50

0H

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63

0H

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80

0H

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1 k

Hz

1.2

5 k

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1.6

kH

z

2 k

Hz

2.5

kH

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3.1

5 k

Hz

4 k

Hz

5 k

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6.3

kH

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8 k

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kH

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16H

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20H

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25H

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31.

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50H

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63H

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80H

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100

Hz

125

Hz

160

Hz

200

Hz

250

Hz

315

Hz

400

Hz

500

Hz

630

Hz

800

Hz

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1.2

5 kH

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1.6

kH

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kH

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3.1

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5 k

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NSL3 - Night 1

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20H

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25H

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31.

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40H

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50H

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63H

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80H

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10

0H

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12

5H

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16

0H

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200

Hz

25

0H

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31

5H

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0H

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50

0H

z

63

0H

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1.2

5 kH

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1.6

kH

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2 k

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2.5

kH

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3.1

5 kH

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4 k

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5 k

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6.3

kH

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8 k

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10

kHz

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5 kH

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20

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NSL3 - Night 2

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dB L90

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Appendix B

Glossary of Noise Terminology

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Glossary of Noise Terminology

Decibel (dB) The unit of sound pressure level, calculated as a logarithm of the intensity of sound. 0dB is the threshold of hearing, 140dB is the threshold of pain. A change of 1 dB is detectable only under laboratory conditions. A change of 10dB corresponds approximately to halving or doubling the loudness of sound. dB(A) Decibels measured on a sound level meter incorporating a frequency weighting (A weighting) which differentiates between sound of different frequency (pitch) in a similar way to the human ear. Measurements in dB(A) broadly agree with peoples assessment of loudness. dB(Z) Decibels measured on a sound level meter with no frequency weighting (0 weighting) across the frequency range of measurement. Sound Reduction Index, Rw The sound reduction index of an element is a measure of sound insulation provided by the element when the element is tested in an acoustic testing laboratory. Apparent Sound Reduction Index, R’w The apparent sound reduction of a building element is the sound reduction provided by the element when the element is tested as part of a building. Impact Sound Insulation LnT’w The weighted standardized impact sound insulation is a measure of the sound insulation provided by a building element to impact sound. Ambient Noise Totally encompassing sound in a given situation at a given time usually composed of a sound from many sources near and far. Background noise level The A-weighted sound pressure level of the residual noise at the assessment position that is exceeded for 90% of a given time interval, T, measured using time weighting F, and quoted to the nearest whole number of decibels. Day – Evening – Night 07:00 to 19:00 – 19:00 to 23:00 – 23:00 to 07:00 Hertz (Hz) Unit of frequency (pitch) of a sound. Impulsive Noise A noise which is of short duration (typically less than one second), the sound pressure level of which is significantly higher than the background. 1/3 Octave band analysis Frequency analysis of sound such that the frequency spectrum is sub divided into bands of one third of an octave each. An octave is taken to be the frequency interval, the upper limit of which is twice the lower limit (in Hertz).

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L(A)eq Equivalent Continuous A-weighted Sound Level. The continuous steady noise level, which would have the same total A-weighted acoustic energy as the real fluctuating noise measured over the same period of time. L(A)10 The A-weighted noise level that is equaled or exceeded for 10% of the measurement period. L(A)90 The A-weighted noise level that is equaled or exceeded for 90% of the measurement period. L(Z)max The unweighted maximum instantaneous noise level that is measured throughout a noise measurement. L(Z)min The unweighted minimum instantaneous noise level that is measured throughout a noise measurement. LAe The LAe, Sound Exposure Level (or SEL) denotes the level whereby the total sound energy is integrated over the measurement period and is then applied to reference duration of 1s. This is a cumulative sound energy value and not an average sound energy value. Lw Sound Power - the energy output from a source. It is measured in dB and can also be depicted in Watts (W). Noise Unwanted sound. Any sound which has the potential to cause disturbance, discomfort or psychological stress to a subject exposed to it, or any sound which has the potential to cause actual physiological harm to a subject exposed to it or physical damage to any structure exposed to it, is known as noise. Noise Sensitive Receptor A noise sensitive receptor is regarded as any dwelling house, hotel or hostel, health building, educational establishment, places of worship or entertainment, or any other facility or area of high amenity which for its proper enjoyment requires the absence of noise at nuisance levels. Peak Particle Velocity The rate of change of displacement of the particles in a solid medium. It is the term usually used to describe vibration in relation to activities involving blasting. Velocity will vary from zero to a maximum value – the peak particle velocity, and the units used are millimeters per second. Rating level L,ArTr The specific noise level plus any adjustment for the characteristic features of the noise. Residual Noise The ambient noise remaining at a given position in a given situation when the specific noise source is suppressed to a degree such that it does not contribute to the ambient noise. Specific Noise source The noise source under investigation for assessing the likelihood of complaint. Tone A noise with a narrow frequency composition identified in ISO 1996 as where the sound pressure level in any given third octave band is equal to or in excess of 5dB above the sound pressure levels in both adjacent one third octave bands. Vibration Regularly repeated movement about a fixed point.

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Appendix C

Calibration Certification

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environmental noise monitoring · noise emission limits as outlined in guidance note ... octave...

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