BS 4142:2014 Assessment of Industrial Noise as per For ...appsd.daera-ni.gov.uk/IPRI/docs/P0095-05A...according to BS 4142:2014. 1. The ambient Noise Level (Leqt) 2. The Residual Noise

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Assessment of Industrial Noise as per BS 4142:2014

For

LacPatrick Dairies NI Ltd.

Document Number 2066-01 v1.01

LAcPatrick Dairies NI Ltd. Assessment of Industrial Noise as per BS 4142: 2014

Environmental Efficiency Document No.: 2066-01 v1.01 Page 2 of 35

Document Lead Sheet Organisation Lac Patrick

Site Artigarvan Client contact Emma Shortt

Permit/Lic No. (if applic)

Order Proposal number 5134 v2

Client PO or other reference

Report title BS4142 Noise Assessment Document number 2066-01

Report template SR18 BS4142 Noise Assessment Type of document Report

Method Statement MS 2066-01 Date written Format for issue PDF

Site visit by JC Date last site visit

31/01/2018

Document author JC Date written 09/02/2018 Approved by RTS Date approved 09/02/2018

Report version nr 1.01 Issued by RTS Date report

issued 09/02/2018

Doc issued to As per client info Method issue Email

All results satisfactory N/A If not satisfactory, further testing required N/A

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

Key to personnel RBS Bob Sutcliffe, Director, CEng, MIMechE, MIEI,CEM RTS Ronan Sutcliffe, Director, Dip. Environmental Protection GB George Byrne, MSc Biosystems Engineering RD Richard Deeney, B.Sc. AIEMA JC John Cullen, BAgSc, P.Grad.Dip Environmental Engineering VB Valerie Browne, BSc Environmental and Earth System Science

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.

Report History 1.00 Issued



TABLE OF CONTENTS

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

2. SUMMARY ................................................................................................................................ 4

3. SAMPLING METHODOLOGY ...................................................................................................... 4

INSTRUMENTATION USED ................................................................................................................. 4 NOISE SURVEY PERSONNEL ............................................................................................................... 5 METEOROLOGICAL CONDITIONS ......................................................................................................... 5 MEASUREMENT LOCATIONS .............................................................................................................. 7 GROUND ATTENUATION .................................................................................................................... 8 AMBIENT NOISE SOURCES ................................................................................................................. 8 STANDARDS USED ............................................................................................................................ 9

4. NOISE SURVEY .......................................................................................................................... 9

RESULTS ...................................................................................................................................... 10

5. DISCUSSION ............................................................................................................................ 14

FIGURE 3-1 NOISE MONITORING LOCATIONS...................................................................................................... 7 FIGURE 6-1 NSL1 AMBIENT DAYTIME ............................................................................................................ 16 FIGURE 6-2 NSL1 RESIDUAL DAYTIME ........................................................................................................... 17 FIGURE 6-3 NSL2 AMBIENT DAYTIME ............................................................................................................ 18 FIGURE 6-4 NSL2 RESIDUAL DAYTIME ........................................................................................................... 19 TABLE 2-1 SUMMARY OF RESULTS ................................................................................................................... 4 TABLE 3-1: EQUIPMENT USED ......................................................................................................................... 5 TABLE 3-2: WEATHER CONDITIONS .................................................................................................................. 6 TABLE 3-4: DESCRIPTION OF MONITORING LOCATIONS ......................................................................................... 7 TABLE 3-5: GROUND ATTENUATION .................................................................................................................. 8 TABLE 3-6: AMBIENT NOISE SOURCES ............................................................................................................... 8 TABLE 4-1: SURVEY RESULTS NSL1 DAYTIME ................................................................................................... 10 TABLE 4-2 RESIDUAL AND BACKGROUND NOISE NSL1 DAYTIME .......................................................................... 10 TABLE 5-1 SUMMARY OF RESULTS .................................................................................................................. 14 APPENDIX 1 GLOSSARY OF TERMS ................................................................................................................... 15 APPENDIX 2 SOUND MEASUREMENT DATA ...................................................................................................... 16 APPENDIX 3 CERTIFICATES OF CALIBRATION ..................................................................................................... 24



1. Introduction Environmental Efficiency Consultants were contracted by LacPatrick Dairies NI Ltd to

investigate the impact of site sound levels at two Noise Sensitive Locations. This

investigation was conducted on 31/01/2018 following BS 4142:2014 between the hours of

16:56 and 23:53.

Two Noise Sensitive Locations (NSL’s) were selected to assess the impacts from site noise.

2. Summary

Table 2-1 Summary of Results

Run Activities noted Difference of Rated noise level and the Background

(dB)

Comment

NSL1 Day

Car Park Traffic +3.9 This does not indicate adverse impacts

NSL1 Night

Process Noise +8.4 Indication of potential adverse impact

NSL2 Day

Waste Water Treatment Plant, Site Traffic

+0.2 This does not indicate adverse impacts

NSL2 Night

Waste Water Treatment Plant

+6.5 Indication of potential adverse impact

3. Sampling Methodology

Instrumentation Used

The equipment shown in the table below were used during the noise survey. All Sound Level

Meters are Type I. The SLMs and calibrators are identified by a LEN (Laboratory Equipment

Number) and this is shown in the table below, the first LEN being for the SLM, the second for

the calibrator. Calibration certificates for the equipment, where appropriate, are shown in

the appendices and are referenced by the LEN.



Table 3-1: Equipment Used

LEN 088

Equipment Model Serial Number Cal cert

SLM Svan 971 40395 Yes

Microphone ACO 7052E 58499 Yes

Calibrator CR: 511E 51431 Yes

Tripod N/A N/A N/A

Windshield N/A N/A N/A

Anemometer Kestral N/A N/A

All noise measurements were ‘A’ weighted and the time-weighting ‘Fast’ was applied (to

equate to human ear hearing). Each SLM is calibrated in the field before the start of each

monitoring run and the drift noted at the end of the monitoring run. Unless stated otherwise

in this report, there was no discrepancy greater than 0.1 dB between the SLM drift reading

and the calibration noise level of 93.7 dB.

Noise Survey Personnel

The noise survey was undertaken by Environmental Efficiency Consultants (Ire) Ltd. Staff as

follows

• Lead consultant

John Cullen, BAgrSc, P.Grad.Dip Environmental Engineering, Institute of

Acoustics Certified Environmental Noise Assessor

Meteorological Conditions

Weather conditions on the day of monitoring were considered appropriate for surveying

purposes and therefore did not affect the readings i.e. conditions were dry and wind speed

was less than 5 m/s (the normal upper limit for taking measurements). The Sound Level Meter

was also fitted with a windshield to minimise interference from potential meteorological

conditions, in keeping with good practice. The meteorological conditions during the survey

periods are shown below.



Table 3-2: Weather Conditions

Date and time

Av. wind

speed, m/s

Temp, C Prevailing weather conditions

Start survey 31/01/2018 16:56 4.8 W 4.0 Overcast, strong breeze, cloud cover 90%

Mid survey 31/01/2018 19:10 4.5 W 4.0 Overcast, strong breeze, cloud cover 80%

End survey 31/01/2018 23:53 1.1 W 2.0 Dry, slight breeze, cloud cover 50%



Measurement Locations

The locations of noise monitoring locations are described in Table 3-3 below and shown in Figure 3-2 and Figure 3-3.

Table 3-4: Description of monitoring locations

Location & GPS Height above

ground, m

Distance from

reflective surface, m

Location Description Noise sensitive location

NSL1 Ambient 54°51'24.21"N 7°24'11.58"W

1.2 >3.5 Residential dwelling Yes

NSL2 Ambient 54°51'30.33"N 7°24'19.34"W

1.2 >3.5 Private laneway with residential dwelling Yes

NSL1 Residual 54°51'27.74"N 7°23'40.72"W

1.2 >3.5 NSL1 suitable alternative location Yes

NSL2 Residual 54°51'49.61"N 7°22'48.65"W

1.2 >3.5 NSL2 suitable alternative location Yes

Figure 3-1 Noise Monitoring Locations



Ground attenuation

If the intervening ground between a noise source and a measurement location is acoustically

absorptive (soft), this can result in a reduction in noise level at the receptor due to absorption

of sound energy by the ground itself. On contrary, if the intervening ground is acoustically

reflective ground (hard), its produces the opposite effect.

The details of the intervening ground between sources and measurement positions are

described in the following table:

Table 3-5: Ground attenuation

Location Ground Details Proportion of soft ground between source and monitoring point

Topography/ buildings

NSL1 Ambient

Grass verge, concrete and tarmacadam

90% See site map

NSL2 Ambient

Grass scrubland, concrete and tarmacadam

90% See site map

NSL1 Residual

Agricultural grassland, concrete and tarmacadam

N/A See site map

NSL2 Residual

Agricultural grassland, concrete and tarmacadam

N/A See site map

Ambient Noise sources In addition to the noise level produced by site activities, the other noise sources impacting on

the area are shown below.

Table 3-6: Ambient Noise Sources

Noise source Location Nature Dog Barking NW of site Intermittent Traffic Berryhill Rd Heavy Local traffic Residential Estate N of site Children playing, traffic



Standards used This noise survey was in accordance with BS 4142 ‘Method for Rating Industrial Noise Affecting

Residential and Industrial areas’ (2014), with a view to determine the level of impact sound

emanating from the site have on the complainant. The following measurements were taken

according to BS 4142:2014.

1. The ambient Noise Level (Leqt)

2. The Residual Noise Level (Leqt)

3. The Background noise level (L90)

4. Noise Survey This Noise Survey was carried out in accordance to BS4142:2014. A sound level assessment

was made by first determining the specific noise (i.e. noise just from site activities). This was

done by taking residual noise levels and subtracting this from the ambient noise (all noise

sources; site + background). This resulting figure is known as the Specific Noise Level.

The operations on-site could not be ceased to record residual and background noise levels at

the same locations as the ambient. The Residual and Background noise levels were therefore

measured at suitable alternative locations. The suitable alternative locations were chosen to

reflect similar background sound characteristics.

A +6 dB penalty is added if tonal or impulsive noise is present. This is known as the Rating

Level. The Rating Level and the Background Level are then compared (the Background Level

is the level for 90% of the time of the Residual Level, L90). Based on this difference an

assessment on whether any adverse impacts are present is made, based on the following

criteria:

• ≥ +10 dB, Indication of significant adverse Impact.

• ≥ +5 dB, Indication of adverse Impact.

• The lower the rated level is relative to the background level, the less likely it is that

the specific noise level will result in adverse impact.

The results of this assessment can be seen below in 4.1. Results of Noise Survey



Results

Table 4-1: Survey Results NSL1 Daytime

Assessment Comments NSL1 Day Clause BS 4142:2014 Date 31/01/2018 Time 18:07 Duration (mins) 60 Ambient noise level LAeq(60), dB 65.6 7.1.3

Residual Noise Level1 LAeq(5mins), dB

65.4 8.1.2

Background Noise Level L90 dB 48.2 8.1

Specific Noise level

By calculation = 10Log (10Lambient/10– 10Lresidual/10), dB.

52.1 7.3.3 & 7.3.5

Acoustic Feature Correction 6 dB penalty if present No 9.3.2

Rating Level No penalty added 52.1 8.3 Excess of rating level over background level +3.9dB 9

Table 4-2 Residual and Background Noise NSL1 Daytime

Assessment Comments Results Day Clause BS 4142:2014

Date 31/01/2018 Location NSL1 Residual (See

map)

Time 19:10 Duration (mins) 5 Residual Noise Level Leq5 (dB)

65.4 8.1.2

Background Noise Level L90 (dB) 48.2

8.1

1 Residual Noise & Background Noise taken from survey on table 4-2.



Table 4-3: Survey Results NSL1 Night Time

Assessment Comments NSL1 Night Clause BS 4142:2014 Date 31/01/2018 Time 23:00 Duration (mins) 15 Ambient noise level LAeq(15), dB 54.1 7.1.3

Residual Noise Level2 LAeq(5mins), dB 50.2 8.1.2




51.8 7.3.3 & 7.3.5


Rating Level No penalty added 51.8 8.3 Excess of rating level over background level +8.4 9

Table 4-4 Residual and Background Noise NSL1 Night time

Assessment Comments Results Night Clause BS 4142:2014


map)


50.2 8.1.2


8.1




Table 4-5: Survey Results NSL2 Day Time

Assessment Comments NSL2 Day Clause BS 4142:2014 Date 31/01/2018 Time 16:56 Duration (mins) 60 Ambient noise level LAeq(60), dB 55.8 7.1.3





50.2 7.3.3 & 7.3.5


Rating Level No penalty added 50.2 8.3 Excess of rating level over background level +0.2dB 9

Table 4-6: Residual and Background Noise NSL2 Day Time

Assessment Comments Results Day Clause BS 4142:2014


map)


54.4 8.1.2


8.1




Table 4-5: Survey Results NSL2 Night Time

Assessment Comments NSL2 Night Clause BS 4142:2014 Date 31/01/2018 Time 23:20 Duration (mins) 15 Ambient noise level LAeq(15), dB 49.7 7.1.3





47.9 7.3.3 & 7.3.5


Rating Level No penalty added 47.9 8.3 Excess of rating level over background level +6.5 9

Table 4-6: Residual and Background Noise NSL2 Night Time

Assessment Comments Results Night Clause BS 4142:2014


map)


45.1dB 8.1.2

Background Noise Level L90 (dB) 41.4dB

8.1




5. Discussion A summary of the results is available below (Table 5-1). As can be seen from the results of the

survey, no significant adverse impacts were noted at either of the Noise Sensitive Locations

(NSL’s) for day or night time as there was no rated level in excess of the background level by

≥ +10dB. However, during the night time runs at NSL1 and NSL2 the rating levels were in excess

of the background levels by +8.4dB and +6.5dB respectively. This can indicate potential

adverse impacts. At these levels complaints are possible.

There was no tonal/impulsive noise noted during the monitoring period.

According to clause 10 of BS4142:2014 we must allow for a level of uncertainty; potential

sources of error include that the wind levels were quite varied throughout the survey and that

the survey was carried out just once. To reduce the level of uncertainty the survey could be

carried out a number of times at varied locations to give a better overview of the rated and

background noise levels.

Table 5-1 Summary of results

Run Activities noted Difference of Rated noise level and the Background (dB)

Comment

NSL1 Day Car Park Traffic +3.9 This does not indicate adverse impacts

NSL1 Night Process Noise +8.4 Indication of potential adverse impact

NSL2 Day Waste Water Treatment Plant, Site Traffic

+0.2 This does not indicate adverse impacts

NSL2 Night Waste Water Treatment Plant

+6.5 Indication of potential adverse impact



Appendix 1 Glossary of terms

Noise Monitoring Parameters

Survey The measurement of noise over one or more days and is made up of a number of monitoring runs with one or more noise meters.

Run or monitoring run

A single measurement at one location to determine noise level. A number of monitoring runs will be typically be made at each location. The duration of a monitoring run is typically 15 or 30 minutes and is stipulated in the licence.

dB(A) This is the unit used to quantify noise measurements. "dB" stands for decibel and the "A" indicates that the noise reading is A-weighted and therefore is a measurement of noise audible to the human ear. The scale is logarithmic.

LAeq,T

This parameter is measured on-site using a noise meter for a specified time period (T minutes). It represents the average noise level that occurred over that period.

Rating Noise Level or Ambient Noise Level Residual Noise Level Background Noise Level Specific Noise Level

The Rating Noise Level is equal to Specific plus any penalty for confirmed tonal and/or subjective impulsive. This the noise level measured on site and is a combination of the specific noise source of interest and all other surrounding sources This is the noise level measured on site in the absence of the specific noise source of interest. This is the noise level measured on site for 90% of the time during the Residual Noise Measurement, known as the L90. The noise level produced by the site/activity of interest

L AF10 and LAF90

The L AF10 and L AF900 are both statistical noise levels. L AF10 indicates that for 10% of the monitoring period, the sound levels were greater than the quoted value. L AF90 indicates that for 90% of the monitoring period, the sound levels were greater than the quoted value. The L AF90 indicates the background noise levels if short-term, intermittent noise sources were ignored e.g. a passing car. The L AF10 can be used to determine the effect to which these short-term noise sources effect the overall average reading i.e. if the L AF10 is very different to the L AF90, then intermittent noise is a significant source of noise

Continuous Noise produced without interruption.

Impulsive Noise A noise of short duration (typically less than one second), the sound pressure of which is significantly higher than the background; brief and abrupt

Intermittent Noise Noise produced on discontinuous basis e.g. equipment operating in cycles or events such as single passing vehicle or aircraft.

Tonal Noise Noise, which contains a clearly audible, tone i.e. a distinguishable, discrete or continuous note (whine, hum, drone, screech, etc.).



Appendix 2 Sound Measurement Data

Figure 5-1 NSL1 Ambient Daytime



Figure 5-2 NSL1 Residual Daytime



Figure 5-3 NSL2 Ambient Daytime



Figure 5-4 NSL2 Residual Daytime



Figure 5-5 NSL1 Ambient Night time



Figure 5-6 NSL1 residual Night time



Figure 5-7 NSL2 Ambient Night time



Figure 5-8 NSL2 Residual Night time



Appendix 3 Certificates of Calibration



Appendix 4 Certificate of Competence

Documents

BS 4142:2014 Assessment of Industrial Noise as per For ...appsd.daera-ni.gov.uk/IPRI/docs/P0095-05A...according to BS 4142:2014. 1. The ambient Noise Level (Leqt) 2. The Residual Noise