acoustic associates sussex ltd noise assessment ......construction ltd. and their architect rh...

Sound Insulation Testing - Acoustic Design of Buildings - BS4142 - PPG24 - Schools Acoustics BB93 -

Vibration - Expert Witness Testimony - Noise at Work - Air Tightness Testing - Auditorium Acoustics

Acoustic Associates Sussex Ltd

Noise Assessment (External Plant)

Report by: George Orton BEng(Hons) MIOA Date: 14th April 2014 Project: J1288

Site: Seaford Library, Warwick House, Seaford Client: VINCI Construction Ltd.

Noise Assessment Acoustic Associates Sussex Ltd Site: Seaford Library J1288 Revised – 14/04/2014

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Contents

1 Introduction ...................................................................................................................................... - 2 -

2 Planning Policy, Context & Noise Assessment Criteria ................................................................... - 3 -

2.1 Context ................................................................................................................................ - 3 -

2.2 National Planning Policy Framework 2012 .......................................................................... - 3 -

2.3 Industrial Noise BS4142 ...................................................................................................... - 3 -

2.4 Local Environmental Health Industrial Noise Criterion ........................................................ - 4 -

2.5 WHO Noise Criteria ............................................................................................................ - 4 -

2.6 BS8233 Noise Criteria ......................................................................................................... - 4 -

2.7 BREEAM Noise Criteria ...................................................................................................... - 4 -

3 Noise Survey Baseline Conditions & Results .................................................................................... - 5 -

3.1 Noise Survey Details ............................................................................................................ - 5 -

3.2 Long Term Background Noise Survey Results ....................................................................... - 6 -

3.3 Short Term Background Noise Survey Results ...................................................................... - 6 -

3.4 Representative Background Noise Level ............................................................................... - 6 -

4 Proposed Plant Machinery................................................................................................................ - 7 -

4.1 Air Handling and Supply/Extraction ..................................................................................... - 7 -

4.2 Air-conditioning Plant ......................................................................................................... - 7 -

5 Industrial Noise Computer Model .................................................................................................... - 8 -

5.1 Methodology ........................................................................................................................ - 8 -

5.2 Noise Contour Models ......................................................................................................... - 9 -

6 BS4142 Industrial Noise Assessment .............................................................................................. - 10 -

6.1 Rating Level ...................................................................................................................... - 10 -

6.2 Representative Background Noise Level ............................................................................. - 10 -

6.3 Likelihood of Complaint ..................................................................................................... - 10 -

7 Conclusion and Comparison with Noise Criteria ........................................................................... - 11 -

7.1 WHO Criteria .................................................................................................................... - 11 -

7.2 BS8233 Criteria ................................................................................................................. - 11 -

7.3 Local Environmental Health Industrial Noise Criterion ...................................................... - 11 -

7.4 BREEAM POL8 Credit ...................................................................................................... - 11 -

7.5 Industrial Noise Mitigation Measures................................................................................. - 11 -

8 Glossary of Terms ........................................................................................................................... - 12 -


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9 Appendix ......................................................................................................................................... - 13 -

9.1 Roof Top Plant Drawing .................................................................................................... - 13 -

9.2 Plant Noise Details ............................................................................................................ - 14 -

9.3 3d Noise Model .................................................................................................................. - 14 -

9.4 Survey Raw Data ............................................................................................................... - 15 -

Tables and Figures

Table 1: BS8233 Criteria ................................................................................................... - 4 -

Table 2: Background Noise Survey Results ...................................................................... - 6 -

Table 3: Air Handling and Extract/Supply Plant Machinery Details .................................... - 7 -

Table 4: AC Plant .............................................................................................................. - 7 -

Figure 1: Noise Survey Measurement Position (Plan) ....................................................... - 5 -

Figure 2: Long Term Survey Results ................................................................................. - 6 -

Figure 3: Day Noise Model 4.5m ....................................................................................... - 9 -

Figure 4: Night Noise Model 4.5m ..................................................................................... - 9 -

Figure 5: System Drawing ............................................................................................... - 13 -

Figure 6: AHU and Extract/Supply Details ....................................................................... - 14 -

Figure 7: AC Plant Noise Details ..................................................................................... - 14 -

Figure 8: Noise Model 3d ................................................................................................ - 14 -

This report has been prepared for the private and confidential use of the client VINCI Construction Ltd. and their Architect RH Partnership only and cannot be reproduced in whole or in part or relied upon by any third party for any use whatsoever without the express written authorisation of Acoustic Associates Sussex Ltd. If any third party whatsoever comes into possession of this report, they rely on it at their own risk and Acoustic Associates Sussex Ltd accepts no duty or responsibility (including in negligence) to any such third party

Report by: George Orton BEng(Hons) MIOA

Checked by: Peter Attwood BSc MSc MCIOB MIOA MIDiagE

Issue 1 17/05/2013

Revised 14/04/2014


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1 Introduction

Acoustic Associates have been appointed to undertake an acoustic assessment relating to the proposed installation of external plant machinery at the Seaford Library Development. This is a revised assessment which details installed plant machinery (plant specification has been altered slightly since original report) The purpose of this assessment is as follows:

Measure and assess existing background noise levels

Predict and assess noise levels created by new external plant machinery The development has gained planning approval albeit with certain conditions. Planning condition 5, which relates to noise, is detailed in section 2. Background noise levels have been measured at two locations close to the proposed development. Plant noise levels have been predicted using Manufacturer’s noise data and the computer program IMMI (Wolfel). Details have been given regarding the noise breakout from proposed plant machinery. Noise breakout levels have assessed in terms of and following the guidelines of the following documents:

BS4142 (1997)

Method for rating industrial noise affecting mixed residential and industrial areas

WHO (1999)

World Health Organisation - Guidelines for Community Noise

BS8233 (1999)

Sound insulation and noise reduction for buildings

ISO9613 (1996)

Attenuation of sound during propagation outdoors The report shows that noise breakout levels from the proposed plant machinery will be relatively low. Assessments have been completed to demonstrate the Local Authority’s typical noise criteria (industrial noise) have been achieved for all nearby noise sensitive locations (including residential parts of the development itself). As the noise rating level is lower than the background noise level (day and night) the BREEAM noise attenuation credit should be awarded

It is considered that that the planning condition, relating to plant noise, has been satisfied


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2 Planning Policy, Context & Noise Assessment Criteria

2.1 Context

The Seaford Library development will form a new library and residential dwellings on the site of the existing (demolished) library. The library development has associated plant machinery which will be installed in a plant room and on the roof. This noise assessment deals with the external plant machinery. Planning condition 5 relates to noise and has been copied below:

Prior to occupation of the development, details of proposed plant and machinery (including, but not restricted to, hours of operation, predicted noise output and any proposed mitigation measures) to be installed as part of the development shall be submitted to and agreed in writing by the Director of Economy, Transport and Environment. The approved details shall form part of the development in operation. Reason; To ensure the noise impact of plant and machinery on the amenities of the area is acceptable in accordance with Policy ST3 (d) in the Lewes District Local Plan 2003.

It is understood that two of the roof mounted condenser units may run at any time of the day or night (2nd floor “Comms Room” condenser and basement floor “Comms Room” condenser). Other roof mounted plant will only run during daytime hours when the library is open (Heating, cooling, air-handling and supply/extraction)

2.2 National Planning Policy Framework 2012

Previously planning policy guidance notes set out the Government's policies on different aspects of planning. Until recently, it was the case that Local Authorities must take their content into account in preparing their development plans. They may be material to decisions on individual planning applications and appeals. PPG24 (relating to noise) has recently been withdrawn and it has been superseded by the National Planning Policy Framework 2012. This later document places the onus on Local Authorities to implement their own local criteria.

It is understood that the Local Authorities are going to generate their own noise assessment guidelines and noise criteria. At the time of completing this report the guidance document had not been published. Based upon discussions with the Local Authorities and the wording of the planning condition it is recommended in this case that appropriate criteria are provided by:

BS8233 (1999) - Sound insulation and noise reduction for buildings

World Health Organisation (WHO) - Guidelines for Community Noise (1999).

Assessment methodology and calculations of noise propagation will follow the principles detailed within:

BS4142 (1997) Method for rating industrial noise (mixed residential/industrial areas)

ISO9613 (1996) Attenuation of sound during propagation outdoors

2.3 Industrial Noise BS4142

The likelihood of complaints about noise from industrial development can be assessed, where the Standard is appropriate, using guidance in BS 4142: 1997.The likelihood of complaints is indicated by the difference between the noise from the new development (expressed in terms of the rating level) and the existing background noise. The Standard states that: "A difference of around 10 dB or higher indicates that complaints are likely. A difference of around 5 dB is of marginal significance." The method is not suitable for assessing the noise measured inside buildings or when the background and rating noise levels are both very low. BS4142 states that background noise levels below about 30 dB and rating levels below about 35 dB are considered to be very low.


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2.4 Local Environmental Health Industrial Noise Criterion

The Local Environmental Health Criterion is that the rating level of noise produced by the industrial source must be, if possible, 5dB below the background noise (LA90) just outside the habitable room windows of the nearest noise sensitive location (NNSL). (the criteria is often relaxed when noise levels (Background & Rating Level) are considered to be very low)

2.5 WHO Noise Criteria

The target internal levels are based on guidelines laid out by the World Health Organisation (WHO) and are as follows:

Room Type Target Maximum Internal Level - Leq dB (A)

Living rooms 35 (Daytime only)

Bedrooms 30 (Night)

The target maximum internal noise level for a bedroom during the night time corresponds to the threshold of sleep disturbance. WHO state that the noise level outside a bedroom window should be less than 45dB(A) this assumes that an open window provides 15dB attenuation.

With regard to outdoor amenity areas WHO states the following:

To protect the majority of people from being seriously annoyed during the daytime, the outdoor sound level from steady, continuous noise should not exceed 55dB(A) on balconies, terraces and in outdoor living areas.

To protect the majority of people from being moderately annoyed during the daytime, the outdoor sound level from steady, continuous noise should not exceed 50dB(A) on balconies, terraces and in outdoor living areas.

2.6 BS8233 Noise Criteria

Table 5 of BS8233 provides the following guideline values:

Criterion Typical Situation Design Range LAeq,T dB

Good Reasonable

Reasonable resting/sleeping conditions

Living Rooms 30 40

Bedrooms 30 35

Table 1: BS8233 Criteria

2.7 BREEAM Noise Criteria

The development is to be assessed under BREEAM’s Bespoke Scheme and a credit can be awarded under the Pol 8 section (Noise Attenuation). BREEAM technical guidance states how the credit can be awarded by completing a BS4142 noise assessment (details summarised below):

The following demonstrates compliance: A noise impact assessment in compliance with BS 4142:1997 has been carried out and the rating level of the noise source(s) from the site/building is equivalent to or less than the background noise level, the credit can be awarded.


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3 Noise Survey Baseline Conditions & Results

A noise survey was carried out between the 16th & 19th May 2011 in order to measure noise levels associated with the Sutton Park Road. Pre-existent background noise levels were also measured concurrently with road noise. Further measurements of day time background were also conducted on the 8th May 2013, at the quieter rear section of the development.

3.1 Noise Survey Details

Survey carried out by: George Orton BEng (Hons) MIOA Equipment used: Norsonic NOR140 - Type 1 Sound Level Meter

Rion NL18 Type 1 Sound Level Meter Castle GA607 Class 1 Acoustic Calibrator

Weather conditions: Dry, Wind speed average less than 3ms-1 ,

The meter was calibrated before commencing the noise measurements (@94dB). The calibration was re-checked at the end of the measurements to ensure that no calibration drift had occurred. After survey the calibration showed no significant drift (94dB)

The long term survey microphone was mounted 5m above ground level, just outside the first floor front façade of the existing library building. As the microphone was only 1m from the façade it follows that measurements were façade level measurements. 3dB(A) has been subtracted from the façade level measurements to convert them to free field measurements. All further results will be expressed as free-field values unless stated otherwise. All measurements were taken using the slow time weighting and with measurement duration set to 5 minutes.

The short term measurement was conducted during a break in the construction of the development. This measurement was 15m long and was conducted in free-field conditions.

The microphone positions used during the noise surveys are shown on the figure below:

Figure 1: Noise Survey Measurement Position (Plan)

Short Term Position (Shielded by partially completed Development)

Long Term Position (at front façade of existing building)


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3.2 Long Term Background Noise Survey Results

The free-field results of the long term survey (measured at front façade of existing building between the 16th & 19th May 2011) can be seen below:

Figure 2: Long Term Survey Results

3.3 Short Term Background Noise Survey Results

The short term noise survey measurement details and results can be found in the table below:

Position Date Start Time Duration LA90 -dB(A) LAeq-dB(A)

Short Term 08/05/2013 14:50 15 Mins 46 61 Table 2: Background Noise Survey Results

3.4 Representative Background Noise Level

In the daytime the Sutton Park Road is relatively busy and is likely to have an effect on the daytime background noise level. Therefore the representative background noise level will be lower at the rear of the development. This is shown by the results in 3.2 and 3.3 (day time level approximately 13dB(A) lower at rear). Due to construction activity it was only possible to complete one measurement of background noise at a quiet part of the day (between rush hours at 14:50). It is possible that the background noise level at the rear of the site may have proven to be lower if more measurements had been conducted. For this reason to predict a worst case scenario 5dB(A) has been subtracted from measurement at rear of the development and therefore:

The representative daytime background noise level at rear of development will be 41dB(A).

The representative daytime background noise level at front of development will be 59dB(A)

During the night time the background noise level is very low and it is considered that the background noise level will not differ greatly front/rear. Therefore representative night-time background noise level will be 24dB(A)

20

30

40

50

60

70

80

FREE

-FIE

LD L

EVEL

-D

B(A

)

L(A)90


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4 Proposed Plant Machinery

4.1 Air Handling and Supply/Extraction

The following air handling and fan units (with associated ductwork/silencers) have been installed on the top floor roof area above library dining room and ancillary areas.

Manufacturer Model Unit Serving

Nuaire SQFA 42 3 Extract Kitchen

Nuaire esbhs1-l Supply Kitchen

Nuaire est6-x Extract Toilet

Nuaire S6-XB-LNWP AHU Supply and Extract General Table 3: Air Handling and Extract/Supply Plant Machinery Details

Attenuators will be fitted to all of the units detailed above (including attenuators on AHU supply and extract).

Calculations will be made to aid with the completion of the computer noise model (see section 5). Initial calculations will be based upon those stated in the “Flakt Woods Practical Guide to Noise Control Book”

Case breakout can be added to the noise model directly as sound power level. To complete the noise model the sound power at duct termination points (atmosphere) will be calculated:

Sound Power just outside duct termination = In-duct sound power (after fan) – silencer attenuation – discharge attenuation (impedance difference means that some sound power will be reflected back into the duct)

For full details of plant noise levels please see appendix.

4.2 Air-conditioning Plant

Air conditioning condensers are also to be installed on the flat roof. 2 condensers are situated towards the front of the library and three are situated to the rear. A summary of the air-conditioning plant can be found in the table below:

Manufacturer Model Serving M&E Ref.

Daikin RGX550K Ground Floor Activity Room HP02

Daikin RXS60F Ground Floor Activity Room HP03

Daikin RXS60F 1st Floor Work Room HP04

Daikin RZQG100L Basement Comms Room HP01

Daikin RZQG71L 2nd Floor Comms Room HP05 Table 4: AC Plant

For full details of plant noise levels please see appendix.


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5 Industrial Noise Computer Model

5.1 Methodology

In order to see how noise varies at different positions around the proposed development it is possible to produce a noise contour map. The architect’s plans and the computer programme IMMI have been used to generate a computer noise contour model of the whole site. The plant machinery detailed in the previous section has also been added to the noise model (plant added to the flat roof area of the top floor and the parapet wall was also added to the model) as detailed in the notes below:

Kitchen Extract – Added to model as octave band point noise source (as shown in appendix)

Kitchen Supply – Added to model as octave band point noise source (as shown in appendix)

Toilet Extract – Added to model as octave band point noise source (as shown in appendix)

AHU Extract – Added to model as octave band point noise source (as shown in appendix)

AHU Supply – Added to model as octave band point noise source (as shown in appendix)

For the case breakout for the above units the sound power of each point source has been calculated using the computer model.

The sound power for each item has been computed by calibrating a noise source within the model. A reception point was added at a distance of 1 or 3 metres from a point noise source (The manufacturer’s test data stated that propagation was either spherical or hemispherical. The calibration process was completed close to the ground for hemispherical propagation and 30m in the air for spherical propagation)

The sound power was then adjusted until the noise level at 1m or 3m matched the noise level as stated by the Manufacturer. The following point sources were added to the model as detailed above (see appendix for full details of noise levels):

AHU Case Breakout

Kitchen Supply Fan Case Breakout

Kitchen Extract Fan Case Breakout

Toilet Extract Fan Case Breakout For the AC plant the sound power of each item (as stated by Daikin) was added to each individual point source:

HP01 Condenser

HP02 Condenser

HP03 Condenser

HP04 Condenser

HP05 Condenser

Noise contours have been completed for 6.5m above ground level as this is the height of nearest noise sensitive locations (attic room of neighboring property and highest residential areas in development itself). Reception Points have also been added to the noise model at the same height at 3 plan positions. The noise predictions are worst case as they calculate the noise level assuming that all of the units (relevant) are running for all of the reference time period. For the daytime all units could operate. However, as stated previously, during the night-time only HP01 and HP045 Comms room condensers will operate. An additional RP was also added on top of the flat roof close to the access hatch.


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5.2 Noise Contour Models

The day and night-time noise models are shown below but it should be noted that a different noise level scale has been used for each model:

Figure 3: Day Noise Model 6.5m

Figure 4: Night Noise Model 6.5m

A 3d figure showing the library and all of the noise sources can be found in the appendix.

NSL1

NSL2

NSL3

Roof Hatch

NSL1

NSL2

NSL3

Roof Hatch


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6 BS4142 Industrial Noise Assessment

6.1 Rating Level

It is important to differentiate between noise rating level and specific noise level. Certain acoustic features can increase the likelihood of complaint. The BS 4142 standard states that 5dB should be added to the specific noise to obtain the rating level if:

a) The noise contains a distinguishable, discrete continuous note (tonal) b) The noise contains distinct impulses. c) The noise is irregular enough to attract attention.

It is likely that a 5dB penalty would have to be applied for tonality however it cannot be certain if the noise breakout is tonal. To fully check for tonality plant machinery 1/3 octave band noise data would be required and in this case was not available.

6.2 Representative Background Noise Level

Section 3.4 shows that the worst case background noise level at noise sensitive locations near to the proposed development will be 41dB(A) during the day dropping to 25dB(A) during the night-time .

6.3 Likelihood of Complaint

BS4142 states that the greater the difference the greater the likelihood of complaints.

A difference of around -10dB indicates that complaints are unlikely

A difference of around +5dB is of marginal significance

A difference of around +10dB or more indicates that complaints are likely

The above shows that complaints would be unlikely even if the character correction was added as Worst case noise rating level would be 35dB(A) which is 6dB lower than the worst case background noise level in the day. At night time noise rating level would be 23dB(A) which is 1dB lower than the worst case background noise level.

These levels are 6-11dB lower than the marginal significance level as stated by BS4142.

It should be noted that the night-time noise rating level and background noise levels are described by BS4142 (see below):

The method is not suitable for assessing the noise measured inside buildings or when the background and rating noise levels are both very low.

NOTE. For the purposes of this standard, background noise levels below about 30 dB and rating levels below about 35 dB are considered to be very low.”

This means that it would be hard to hear the noise created by the plant and it would be even harder to measure due to the influence of extraneous noise sources.

Even in the day time it will be impossible to accurately measure plant noise at the nearest noise sensitive locations as predicted plant noise level will be lower than ambient noise level of extraneous noise sources.

It should be noted that VINCI Technology Centre completed an hour long measurement on the flat roof whilst the plant was running. The measurement was taken near the access hatch and a RP was added to the model at the corresponding position. The RP predicted level was 50dBA during the daytime and the actual measurement was 29dBA during the daytime.


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7 Conclusion and Comparison with Noise Criteria

7.1 WHO Criteria

The noise model predicts that the worst case noise level at the nearest noise sensitive location will be 30dB(A); this will be approximately 3dB higher outside the façade of the building (noise model predicts free-field noise level).

Assuming that an open window will provide 15dB attenuation demonstrates that the internal noise level will be approximately 18dB(A).

The noise level in the rear garden of the adjacent property will be even lower (garden is lower than reception point and therefore further from the roof mounted plant).

The above shows that all of the WHO noise criteria are easily achieved even for bedrooms with open windows

7.2 BS8233 Criteria

The internal noise level prediction detailed above will mean that the BS8233 “GOOD” criteria will be achieved for bedrooms and lounges even if windows are open.

7.3 Local Environmental Health Industrial Noise Criterion

The Local Environmental Health Criterion is that the rating level of noise produced by the industrial source must be, if possible, 5dB below the background noise (LA90) just outside the nearest habitable room window.

The assessment showed that the above criterion has been achieved even when compared to the worst case background noise level and assuming that the plant machinery emits noise of a tonal nature. The Local Environmental Health Criterion is achieved for the day time period. At night time the criteria would not be appropriate as the noise levels (Background noise level and noise rating level) are classified by BS4142 as very low.

7.4 BREEAM POL8 Credit

As the noise rating level is lower than the background noise level (day and night) the BREEAM noise attenuation credit should be awarded

7.5 Industrial Noise Mitigation Measures

The assessments above demonstrate that no extra noise mitigation measures will be required (other than install the proposed silencers as detailed in the plant specification). The noise measurement completed by VINCI Technology Centre demonstrates that noise predictions may be worst case and operating levels may be lower.

For the reasons above it is considered that the planning condition has been satisfied.


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8 Glossary of Terms

Specific noise level, LAeq,Tr

The equivalent continuous A-weighted sound pressure level at the assessment position produced by the specific noise source over a given reference time interval.

Measurement time interval, Tm

The total time over which measurements are taken. NOTE. This may consist of the sum of a number of non-contiguous, short term measurement time intervals.

Rating level, LAr,Tr

The specific noise level plus any adjustment for the characteristic features of the noise.

Ambient noise

Totally encompassing sound in a given situation at a given time usually composed of sound from many sources near and far.

Background noise level, LA90,T

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

Background noise level, LA90,T

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.

Weighted Sound Reduction Index, Rw

Rw is the weighted sound reduction index. It is measured in a laboratory with suppressed flanking transmission. R varies with frequency and is weighted to give a single figure number Rw.


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9 Appendix

9.1 Roof Top Plant Drawing

Figure 5: System Drawing


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9.2 Plant Noise Details

Figure 6: AHU and Extract/Supply Details

Figure 7: AC Plant Noise Details

9.3 3d Noise Model

Figure 8: Noise Model 3d

AHU and Supply/Extract Details AHU and Supply/Extract Case Breakout

Item 125 250 500 1000 2000 4000 8000 Unit Breakout DistancePropagation Model Lw

Kitchen extract SQFA 42 3 93 78 74 78 80 77 69 53dB(A) 3 spherical 74

Silencer attenuation for above 22 29 46 55 53 44 33

Kitchen supply esbhs1-l 73 67 57 59 59 54 45 25dB(A) 3 Assume sph 46


Toilet extract est6-x 77 70 56 52 49 46 38 43dB(A) 3 ? Assume sph 64


AHU Extract S6-XB-LNWP 78 71 61 55 51 43 40 47dB(A) 3 spherical 68


AHU Supply S6-XB-LNWP 77 74 64 58 55 46 36 see above


Termination Attenuation 400 dia A=0.12 8 4 1 0 0 0 0

Termination Attenuation 400mm sqr A=0.16 7 3.2 0.7 0 0 0 0

Kitchen extract 400mm sqr Model Lw 64 45.8 27.3 23 27 33 36

Kitchen supply 400 dia Model Lw 62 57 41 40 45 41 35

Toilet extract 400mm sqr Model Lw 58 47.8 27.3 15 18 21 23

AHU Extract 400mm sqr Model Lw 59 48.8 32.3 18 20 18 25

AHU Supply 400mm sqr Model Lw 62 57.8 44.3 32 34 28 25

AC Unit Info

All AC units Daikin

Position Serving UNIT Model/Manufacturer Lw

Rear Acivity Room RGX550K 60

Rear Acivity Room RXS60F 63

Rear Work Room RXS60F 63

Front Basement CommsRZQG100L 66

Front 2nd Floor CommsRZQG71L 64


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9.4 Survey Raw Data

L90 dB(A) L90 dB(A) L90 dB(A) L90 dB(A) L90 dB(A) L90 dB(A) L90 dB(A) L90 dB(A) L90 dB(A) L90 dB(A) L90 dB(A)

07:00 61.6 13:35 56.4 20:10 51.3 02:45 34.2 09:20 59.6 15:55 58.4 22:30 42.7 05:05 43.9 11:40 60.1 18:15 59.6 00:50 27.3

07:05 64.6 13:40 58.8 20:15 51.5 02:50 34.5 09:25 55.7 16:00 60.3 22:35 42.3 05:10 46.1 11:45 60.6 18:20 62.4 00:55 27.1

07:10 60.4 13:45 57.4 20:20 51 02:55 34.9 09:30 58.7 16:05 59 22:40 40.7 05:15 44.8 11:50 59 18:25 59.1 01:00 26.2

07:15 59.3 13:50 57 20:25 52.2 03:00 35.1 09:35 58.9 16:10 60 22:45 41.7 05:20 42 11:55 58.5 18:30 61.3 01:05 25.9

07:20 63.2 13:55 60.6 20:30 55.4 03:05 35.2 09:40 57.4 16:15 57.2 22:50 45.2 05:25 44.7 12:00 59.2 18:35 61.3 01:10 25.2

07:25 59.2 14:00 60.4 20:35 54 03:10 34.5 09:45 58.2 16:20 58.4 22:55 44.6 05:30 42.6 12:05 59.7 18:40 60.2 01:15 25.5

07:30 61.2 14:05 56.3 20:40 54.5 03:15 36.2 09:50 58.7 16:25 58.9 23:00 46.3 05:35 40.9 12:10 59.3 18:45 60.2 01:20 25.8

07:35 61 14:10 57.8 20:45 51.5 03:20 35.2 09:55 57.8 16:30 58.7 23:05 41.1 05:40 39.7 12:15 58.2 18:50 57.9 01:25 26.1

07:40 61.9 14:15 59.6 20:50 50 03:25 36.8 10:00 55.5 16:35 59.4 23:10 36.9 05:45 40.4 12:20 58.5 18:55 58.6 01:30 28.9

07:45 60.2 14:20 58.4 20:55 55.7 03:30 35.6 10:05 57.4 16:40 59.3 23:15 36.7 05:50 40.5 12:25 57.7 19:00 59.5 01:35 25.6

07:50 64.5 14:25 57.6 21:00 55.7 03:35 35.6 10:10 57.7 16:45 59.1 23:20 36 05:55 40.5 12:30 59.4 19:05 52.5 01:40 26

07:55 62.1 14:30 61.1 21:05 44.4 03:40 35.8 10:15 57.9 16:50 59.2 23:25 38.7 06:00 44.1 12:35 60.7 19:10 58.8 01:45 26

08:00 62.5 14:35 57 21:10 51.3 03:45 36.4 10:20 58.5 16:55 60.1 23:30 37.3 06:05 47 12:40 60.1 19:15 59.4 01:50 24.1

08:05 61.4 14:40 57.7 21:15 49.1 03:50 36.2 10:25 60.1 17:00 59.7 23:35 35 06:10 46.1 12:45 57.8 19:20 56.1 01:55 24

08:10 59.4 14:45 58.4 21:20 50.1 03:55 36.5 10:30 59.1 17:05 61.6 23:40 36 06:15 47.9 12:50 61.4 19:25 58.9 02:00 26.6

08:15 60.5 14:50 57.3 21:25 47.1 04:00 36.3 10:35 59.7 17:10 59 23:45 35.2 06:20 52 12:55 58.7 19:30 59.8 02:05 23.6

08:20 61.2 14:55 58.2 21:30 49.4 04:05 36.3 10:40 59.5 17:15 59.6 23:50 35 06:25 55.1 13:00 55.6 19:35 53.8 02:10 23.4

08:25 60.6 15:00 57.6 21:35 42.9 04:10 37 10:45 58.3 17:20 58.9 23:55 35.7 06:30 50.8 13:05 60.8 19:40 53.2 02:15 23.7

08:30 59.3 15:05 59.8 21:40 46.5 04:15 37.9 10:50 60 17:25 60.3 00:00 34.9 06:35 56.1 13:10 61.2 19:45 54.7 02:20 23.5

08:35 60.5 15:10 57.2 21:45 47.9 04:20 37.5 10:55 58.6 17:30 59.7 00:05 34.6 06:40 56.3 13:15 60.2 19:50 53.4 02:25 24.9

08:40 60 15:15 61.3 21:50 48.4 04:25 37.9 11:00 59.1 17:35 60 00:10 35.4 06:45 58.3 13:20 60.5 19:55 56.8 02:30 25.2

08:45 62 15:20 58.1 21:55 43.8 04:30 40.8 11:05 59.4 17:40 59.5 00:15 35.1 06:50 56.5 13:25 58.9 20:00 53.6 02:35 24.5

08:50 58.5 15:25 58.8 22:00 53.4 04:35 38.7 11:10 57.6 17:45 59.5 00:20 34.4 06:55 60.5 13:30 57.9 20:05 51.9 02:40 23.8

08:55 61.3 15:30 58.5 22:05 42.6 04:40 39 11:15 55.7 17:50 62.6 00:25 33.5 07:00 60.4 13:35 58.8 20:10 54.5 02:45 24.4

09:00 59.8 15:35 59 22:10 42.9 04:45 39 11:20 57 17:55 59.1 00:30 34.1 07:05 61 13:40 60.7 20:15 58.1 02:50 23

09:05 57.4 15:40 57.7 22:15 47.7 04:50 38.1 11:25 59.8 18:00 58.1 00:35 33.9 07:10 62.5 13:45 61.8 20:20 56.5 02:55 25

09:10 57.7 15:45 59.1 22:20 43.8 04:55 39.1 11:30 56.8 18:05 60.2 00:40 33.9 07:15 61.9 13:50 59.2 20:25 57.2 03:00 24.8

09:15 58.5 15:50 57.7 22:25 44.6 05:00 40.6 11:35 56.5 18:10 62.7 00:45 33.4 07:20 62.8 13:55 56.9 20:30 53.1 03:05 24.6

09:20 58 15:55 58.1 22:30 42.6 05:05 39.5 11:40 59.4 18:15 60.5 00:50 33.9 07:25 62.5 14:00 59.8 20:35 56.5 03:10 23.9

09:25 59.4 16:00 59.3 22:35 42.5 05:10 40.5 11:45 58.2 18:20 60.6 00:55 33 07:30 59.4 14:05 60 20:40 47.6 03:15 23.5

09:30 57.8 16:05 58.5 22:40 41.4 05:15 41.6 11:50 58.1 18:25 61.7 01:00 32.8 07:35 59.7 14:10 58.6 20:45 50.3 03:20 23.5

09:35 57.7 16:10 59.4 22:45 45.7 05:20 43 11:55 55.2 18:30 60.9 01:05 32 07:40 60.7 14:15 58.2 20:50 49.3 03:25 24.2

09:40 59.6 16:15 58.7 22:50 46.2 05:25 43 12:00 59.8 18:35 58.6 01:10 31.5 07:45 60 14:20 59.2 20:55 56.5 03:30 23.7

09:45 58.9 16:20 59.5 22:55 43.5 05:30 43.6 12:05 58.5 18:40 59.5 01:15 31.6 07:50 60.3 14:25 58.6 21:00 51.8 03:35 25

09:50 59.3 16:25 59.1 23:00 48.3 05:35 40.8 12:10 59 18:45 58.9 01:20 31.3 07:55 60.8 14:30 59.7 21:05 50.6 03:40 24

09:55 59.1 16:30 59.5 23:05 40.2 05:40 40.1 12:15 57.7 18:50 59.3 01:25 30.6 08:00 61.9 14:35 59.8 21:10 54.6 03:45 25.4

10:00 57.8 16:35 59.9 23:10 37.8 05:45 42.5 12:20 58 18:55 59.4 01:30 30.4 08:05 60.4 14:40 58.4 21:15 49.4 03:50 25.2

10:05 59.7 16:40 59.8 23:15 38.6 05:50 42.1 12:25 58.5 19:00 58.1 01:35 29.5 08:10 60.3 14:45 59.9 21:20 47 03:55 27.9

10:10 58.9 16:45 59.1 23:20 38.8 05:55 46.8 12:30 60 19:05 57.5 01:40 30.4 08:15 60.2 14:50 60 21:25 54.2 04:00 29.6

10:15 56.8 16:50 59.8 23:25 39.9 06:00 47.5 12:35 58.8 19:10 59.9 01:45 28.4 08:20 59.4 14:55 60 21:30 48 04:05 28.5

10:20 57.6 16:55 59.7 23:30 38.7 06:05 50.4 12:40 57.6 19:15 58.1 01:50 29.1 08:25 60.9 15:00 59.6 21:35 48.5 04:10 27.8

10:25 56.7 17:00 60 23:35 36.4 06:10 48.8 12:45 58 19:20 58.8 01:55 29.3 08:30 60.4 15:05 58.8 21:40 51.4 04:15 31

10:30 58.2 17:05 60.6 23:40 36.4 06:15 52.3 12:50 57.4 19:25 57.1 02:00 30.9 08:35 59.5 15:10 62.2 21:45 52 04:20 30.3

10:35 58.8 17:10 60.5 23:45 36.8 06:20 50.2 12:55 58.3 19:30 59 02:05 31.1 08:40 60.6 15:15 59 21:50 49 04:25 31.6

10:40 58.5 17:15 63.4 23:50 36.2 06:25 55 13:00 59 19:35 57.7 02:10 31.1 08:45 59.7 15:20 59.1 21:55 46.1 04:30 31.4

10:45 57.4 17:20 59.4 23:55 37.4 06:30 50.6 13:05 59 19:40 57 02:15 31.2 08:50 60 15:25 60.1 22:00 54.3 04:35 31.6

10:50 59.1 17:25 61.4 00:00 37.2 06:35 61.1 13:10 59.3 19:45 58.8 02:20 31.8 08:55 58.7 15:30 57.6 22:05 54.2 04:40 30.1

10:55 57.7 17:30 59.7 00:05 38 06:40 65.5 13:15 58.3 19:50 58.3 02:25 32.6 09:00 59 15:35 59.2 22:10 46.3 04:45 31.5

11:00 57.4 17:35 59.6 00:10 39.2 06:45 55.5 13:20 54.6 19:55 54.5 02:30 31.6 09:05 58.5 15:40 58.7 22:15 42 04:50 29.3

11:05 58.4 17:40 59.6 00:15 36.3 06:50 57.1 13:25 58.3 20:00 53.7 02:35 31.4 09:10 59.4 15:45 58.2 22:20 38.9 04:55 35.2

11:10 57.9 17:45 59.6 00:20 37.3 06:55 57.2 13:30 57.8 20:05 55.3 02:40 31.2 09:15 59.7 15:50 58.3 22:25 39.4 05:00 30.8

11:15 59.5 17:50 59.3 00:25 36.6 07:00 58.5 13:35 59 20:10 55 02:45 30.7 09:20 60.6 15:55 59.2 22:30 43.1 05:05 35.8

11:20 59.3 17:55 62.9 00:30 39.4 07:05 60.2 13:40 59.1 20:15 57.1 02:50 30.9 09:25 57.5 16:00 63.7 22:35 41.8 05:10 42.9

11:25 58.5 18:00 59.4 00:35 37.1 07:10 59.8 13:45 57.8 20:20 54.5 02:55 31.5 09:30 59.1 16:05 60.5 22:40 44.4 05:15 43.9

11:30 56.6 18:05 62.6 00:40 36.9 07:15 59.2 13:50 58.2 20:25 50.8 03:00 31.3 09:35 57.9 16:10 61.2 22:45 46.3 05:20 45.3

11:35 58 18:10 59.1 00:45 37 07:20 57.5 13:55 59.2 20:30 54.1 03:05 31.5 09:40 59.6 16:15 59.4 22:50 41.9 05:25 44.3

11:40 57.4 18:15 60.8 00:50 36.1 07:25 57.2 14:00 59 20:35 57.1 03:10 32.6 09:45 59.4 16:20 58.4 22:55 43.2 05:30 45.8

11:45 59.6 18:20 60.3 00:55 34 07:30 61.8 14:05 57.1 20:40 53.9 03:15 31.1 09:50 58.9 16:25 59.8 23:00 37.8 05:35 41.2

11:50 60.5 18:25 60.8 01:00 33.9 07:35 63.2 14:10 60.4 20:45 56.2 03:20 30.8 09:55 56.8 16:30 61.2 23:05 40.2 05:40 43.4

11:55 55 18:30 60.3 01:05 34.2 07:40 61.4 14:15 59.4 20:50 55.9 03:25 29.9 10:00 56.7 16:35 60 23:10 39.6 05:45 39

12:00 59.4 18:35 58.8 01:10 36 07:45 61.6 14:20 58 20:55 45 03:30 29.3 10:05 58.4 16:40 61.3 23:15 33 05:50 38.4

12:05 58.3 18:40 59.6 01:15 36.2 07:50 61.8 14:25 57.7 21:00 54.8 03:35 29.9 10:10 58.2 16:45 57.9 23:20 33.9 05:55 41.2

12:10 59.1 18:45 60 01:20 36.3 07:55 60.1 14:30 59.4 21:05 52.3 03:40 29.1 10:15 58.6 16:50 59.8 23:25 31.4 06:00 40.9

12:15 57.7 18:50 59.4 01:25 37.7 08:00 62.7 14:35 60.4 21:10 55.1 03:45 29.8 10:20 58.1 16:55 60.5 23:30 36.6 06:05 49.1

12:20 59.4 18:55 61.6 01:30 37.4 08:05 61.8 14:40 58.2 21:15 49.3 03:50 31.3 10:25 59.7 17:00 58 23:35 31 06:10 45.6

12:25 59.3 19:00 59.4 01:35 37.1 08:10 59.3 14:45 59 21:20 51.5 03:55 31.6 10:30 56.7 17:05 62.8 23:40 32.2 06:15 42.8

12:30 57.5 19:05 60.4 01:40 36.1 08:15 59.5 14:50 58.2 21:25 49.5 04:00 32.5 10:35 59.5 17:10 61.3 23:45 30.4 06:20 55.2

12:35 59.6 19:10 57.1 01:45 36.7 08:20 61 14:55 59.1 21:30 45 04:05 31.8 10:40 58.8 17:15 60.4 23:50 28.9 06:25 48.5

12:40 57.7 19:15 58.2 01:50 36.7 08:25 59 15:00 59.3 21:35 49.3 04:10 32.8 10:45 59.8 17:20 61.4 23:55 30.3 06:30 53.9

12:45 57.8 19:20 53.9 01:55 36.2 08:30 59.9 15:05 59.6 21:40 50 04:15 33.7 10:50 60 17:25 63.3 00:00 30.1 06:35 58

12:50 59.9 19:25 59.3 02:00 35.7 08:35 58.8 15:10 60.4 21:45 48.2 04:20 34.2 10:55 59.7 17:30 63.1 00:05 28.6 06:40 53.3

12:55 57.5 19:30 58.8 02:05 35.9 08:40 59.9 15:15 57.3 21:50 43.6 04:25 37.4 11:00 58.6 17:35 61.3 00:10 30 06:45 58.6

13:00 58.7 19:35 51.2 02:10 36.8 08:45 59.6 15:20 59.2 21:55 45.2 04:30 36.7 11:05 57.8 17:40 61.9 00:15 29.4 06:50 58.3

13:05 58.6 19:40 55.6 02:15 35.2 08:50 57.3 15:25 59.4 22:00 51.3 04:35 36.9 11:10 58 17:45 60.5 00:20 29 06:55 59.4

13:10 59.4 19:45 57.9 02:20 34.2 08:55 59 15:30 58.6 22:05 52.4 04:40 36.1 11:15 60.4 17:50 60.9 00:25 27.1

13:15 58.4 19:50 55.5 02:25 34.7 09:00 60.2 15:35 58.7 22:10 48.8 04:45 37.7 11:20 59.4 17:55 58.7 00:30 28.6

13:20 61.2 19:55 51.2 02:30 35.2 09:05 58 15:40 59 22:15 44.8 04:50 38.2 11:25 60 18:00 60.9 00:35 29.1

13:25 58.5 20:00 56.2 02:35 34.8 09:10 57.9 15:45 59.2 22:20 39.2 04:55 36.5 11:30 57.6 18:05 60 00:40 31.1

13:30 59.8 20:05 55.3 02:40 34.3 09:15 59.1 15:50 58.5 22:25 45.4 05:00 42.1 11:35 58.6 18:10 60.1 00:45 26.5

acoustic associates sussex ltd noise assessment ......construction ltd. and their architect rh...

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