Noise Impact Assessment 3 (1)

8/11/2019 Noise Impact Assessment 3 (1)

1/12

Client: One Creative Environments Ltd.

Site: Burntwood Leisure Centre PCC

Page: 1 of 12 HRS Report Ref: 109591-AC-2v1

Acoustics Department, HRS Services Ltd.

Email: [email protected]

Tel: 0114 228 3540

S Services Ltd. The Maltings. Burton Road. Sheffield. S3 8BZ | Tel: 0114 2723004 | Fax: 0114 2723003 | www.hrsservices.co.uk | email: [email protected] SE Westgate MPhil BSc MCIOB PT Westgate BSc Dip Min Eng Registered Number 2115177 (Wales) VAT No. 440 1069 93

This test report shall not be reproduced except in full without the written approval of HRS Services Ltd.

BURNTWOOD LEISURE CENTRE PCC

LICHFIELD

BS 4142 NOISE IMPACT ASSESSMENT

HRS REF: 109591-AC-2V1

Authorised by: Silvio Murgia

Position: Senior Acoustics Manager

Signed:

Date: 11/05/2011

For and on behalf of HRS Services Ltd


2/12






Tel: 0114 228 3540


Contents

1.0 INTRODUCTION..............................................3

2.0 BACKGROUND NOISE SURVEY ...................4

3.0 NOISE ASSESSMENT CRITERIA...................6

4.0 BREEAM PLANT NOISE CRITERIA...............8

5.0 SUMMARY AND CONCLUSIONS...................9

APPENDIX I - GLOSSARY OF TERMS.....................10

APPENDIX II SURVEY RESULTS ..........................11

APPENDIX III PROPOSED SITE LAYOUT.............12


3/12






Tel: 0114 228 3540


1.0 Introduction

1.1 One Creative Environments Ltd. has appointed HRS Services Limited (HRS) to carry out daytime and

night time background noise surveys relating to the proposed development of a new Primary Care

Centre at Burntwood Leisure Centre, Lichfield.

1.2 The purpose of this report is to detail daytime and night time background noise survey results in order

to identify suitable noise criteria to meet BREEAM: Healthcare 2008 Section Pol 8 requirements.

1.3 The project is understood to involve the construction of a new two storey Primary Care Centre with

associated parking spaces.

1.4 The development site currently comprises a playing field and is located approximately 30m south from

the existing Burntwood Leisure Centre (See Appendix III). The surrounding area is predominantly

residential with the M6 Toll approximately 1.5km to the south of the site.

1.5 This document has been prepared for the sole use, benefit and information of One Creative

Environments Ltd for the purposes set out in the document or instructions commissioning the works.

The liability of HRS in respect of the information contained herein will not extend to any third party.

1.6 This report is limited to addressing the specific acoustic issues contained herein and is based on information

and drawings provided by the client.

1.7 Whilst every effort has been made to ensure that this report is easy to understand, it is technical in

nature; to assist the reader, a glossary of terminology is included in Appendix I.


4/12






Tel: 0114 228 3540


2.0 Background Noise Survey

2.1 Background noise surveys were carried out in order to establish the existing noise climate and lowest

background noise levels during the night time and daytime periods.

2.2 Noise measurements were carried out between 1900 2100 hours on 9th

May and between 0200 -0430 hours on 10

thMay 2011.

2.3 Noise levels were measured using a UKAS calibrated B&K 2260 Investigator Class 1 precision

integrating sound level meter. Calibration checks were carried out both before and after the

measurements with no significant variance observed.

2.4 Weather conditions during the survey were dry and calm with measured wind speed less than 5ms-1

.

2.5 The sound level meter was mounted on a tripod at an approximate height of 1.5m and fitted with a

proprietary windshield. Noise levels were taken over 5 - 15 minute sample periods.

2.6 Timing of measurements was chosen to coincide with the quietest times during the night time and

daytime in order to give the worst case noise impact levels on the basis that plant associated with the

proposed Primary Care Centre could potentially be operational during theses times.

2.7 Three measurement locations were used as indicated in Figure 1. The measurement results are detailed in

Appendix II and summarised in Table 1 below.

Table 1: Summary of measured noise levels

Night-time

(0200 0430)

Daytime

(1900 2100)Measurement Location

LAeq,15min(dB) LAF90,15min(dB) LAeq,15min(dB) LAF90,15min(dB)

1. At Southern site boundary byrear of gardens to houses on

Baker Street36 - 38 34 - 35 47 - 50 42 - 46

2. At Eastern site boundary by rear

of gardens to houses on BakerStreet 38 - 39 35 - 37 47 - 49 42 - 46

3. At Western site boundary byrear of gardens to houses on High

Street35 - 38 31 - 35 51 42 - 43


5/12






Tel: 0114 228 3540


Figure 1: Approximate measurement Locations

The following observations were made during the day and night noise surveys:

Night time

Locations 1,2 & 3 - Distant Road traffic was the dominant noise source, with birdsong towards to

the end of the measurement period.

Daytime

Locations 1, 2 & 3 - For the duration of measurements at each location, distant road traffic from

the M6 Toll and local traffic on nearby access roads were the dominant noise

sources.

Existing BurntwoodLeisure Centre

ApproximateLocation of

proposedPrimary CareCentre

1

2

3


6/12






Tel: 0114 228 3540


3.0 Noise Assessment Criteria

3.1 The most commonly used method in the UK for assessing impact of fixed building services plant noise is

British Standard 4142: 1997, Method for Rating industrial noise affecting mixed residential and industrial

areas (BS4142). This standard requires the noise from the proposed new equipment (in LAeq) to be compared

with the existing background noise level (LA90) at a noise sensitive receptor (NSR) location. NSRs include

housing, schools, hospitals and churches. The most exposed NSRs (usually the nearest to the plant location)

are taken as being a worst case for assessment purposes.

3.2 To account for the increased potential for noise disturbance due to changes in or noticeable features of the

plant noise, a 5dB penalty is added for any plant which gives rise to noise features that may increase

disturbance. The resultant level, following the application of this correction, (where necessary) is called the

Rating Level.

3.3 With respect to the +5dB correction, BS4142 states:

Certain acoustic features can increase the likelihood of complaint over that expected

from a simple comparison between the specific noise level and the background

noise level. Where present at the assessment location, such features are taken into

account by adding 5dB to the specific noise level to obtain the rating level.

Apply a 5dB correction if one or more of the following features occur, or are

expected to be present for new or modified noise sources:

a. The noise contains a distinguishable, discrete, continuous note (whine, hiss, screech, hum, etc);

b. The noise contains distinct impulses (bangs, clicks, clatters or thumps);

c. The noise is irregular enough to attract attention.

3.4 HRS recommend that, for mechanical building services plant, the +5dB correction be applied on the basis that

it is likely that one of the noise features described above shall apply.

3.5 BS4142 states the following regarding the result of the assessment:


7/12






Tel: 0114 228 3540


Table 2: Summary of BS4142: 1997 Assessment

Result of subtraction of the Measured

Background LAF90from the BS4142 Rating

Level, LAr,Tr

BS4142 noise assessment

+ 10dB or more Complaints are likely

Around + 5dB Marginal significance

More than 10dB belowPositive indication that complaints are

unlikely

3.6 BREEAM Healthcare: 2008 version 4 states the following with respect to assessment of noise impact under

Pol 8 Noise Attenuation in its Pollution section:


8/12






Tel: 0114 228 3540


4.1 Based on HRS Services background noise survey data in Table 1, assessment in accordance with

BREEAM Pol 8 indicates that emission levels for plant noise, in terms of BS4142 Rating Level LAr,Tr, at

locations near to the plant should not exceed the limit values in Table 3:

Table 3: Plant Noise Limits to Meet BREEAM Education: 2008 Pol 8 criterion

Lowest measured existing background

noise level (LA90)

Plant noise limit (LAr,Tr) at noise

sensitive receiver (including +5dB

acoustic feature correction)

Noise Sensitive Receptor

Measurement Location

Night-time

(2300 0700)

Daytime

(0700 2300)

Night-time

(2300 0700)

Daytime

(0700 2300)

1. At Southern site boundaryby rear of gardens to houses

on Baker Street

34 42 34 42

2. At Eastern site boundaryby rear of gardens to houses

on Baker Street

35 42 35 42

3. At Western site boundaryby rear of gardens to houses

on High Street

31 42 31 42

4.0 BREEAM Plant Noise Criteria


9/12






Tel: 0114 228 3540


5.0 Summary and Conclusions

5.1. Daytime and night-time noise surveys have been carried out at and around the proposed development site to

inform BREEAM: Healthcare 2008 Pol 8 design works for the new Primary Care Centre at Burntwood Leisure

Centre, Lichfield.

5.2. The night time and daytime noise surveys were undertaken at positions representative of the nearest noise

sensitive locations to the site in order to establish the existing noise climate and lowest background noise

levels during the anticipated possible operation times of new building services plant.

5.3. Suitable plant noise criteria at the nearby dwellings have been identified to meet BREEAM: Healthcare: 2008

Pol 8 credit requirements.


10/12






Tel: 0114 228 3540


Appendix I - Glossary of Terms

Sound Pressure Level and the decibel (dB)

A sound wave is a small fluctuation of atmospheric pressure. The human ear responds to these variations in

pressure, producing the sensation of hearing. The ear can detect a very wide range of pressure variations.

In order to cope with this wide range of pressure variations, a logarithmic scale is used to convert the values

into manageable numbers. Although it might seem unusual to use a logarithmic scale to measure a physical

phenomenon, it has been found that human hearing also responds to sound in an approximately logarithmic

fashion. The dB (decibel) is the logarithmic unit used to describe sound (or noise) levels. The usual range of

sound pressure levels is from 0 dB (threshold of hearing) to 120 dB (threshold of pain).

Frequency and hertz (Hz)

As well as the loudness of a sound, the frequency content of a sound is also very important. Frequency is a

measure of the rate of fluctuation of a sound wave. The unit used is cycles per second, or hertz (Hz).

Sometimes large frequency values are written as kilohertz (kHz), where 1 kHz = 1000 Hz.

Young people with normal hearing can hear frequencies in the range 20 Hz to 20,000 Hz. However, the

upper frequency limit gradually reduces as a person gets older.

Noise Indices

When a noise level is constant and does not fluctuate over time, it can be described adequately by

measuring the dB(A) level. However, when the noise level varies with time, the measured dB(A) level will

vary as well. In this case it is therefore not possible to represent the noise climate with a simple dB(A) value.

In order to describe noise where the level is continuously varying, a number of other indices, including

statistical parameters, are used. The indices used in this report are described below.

LAeq This is the A-weighted 'equivalent continuous noise level' which is an average of the total sound

energy measured over a specified time period. In other words, LAeq is the level of a continuous

noise which has the same total (A-weighted) energy as the real fluctuating noise, measured over the

same time period. It is increasingly being used as the preferred parameter for all forms of

environmental noise.

LAmax This is the maximum A-weighted noise level that was recorded during the monitoring period.

LA10 This is the A-weighted noise level that was recorded for at least 10% of the monitoring period.

LA90 This is the minimum A-weighted noise level that was recorded for at least 90% of the

monitoring period. Usually taken as the underlying background noise level.


11/12






Tel: 0114 228 3540


Appendix II Survey Results

Measured ambient background noise levels (all free field unless otherwise stated)

Night time noise levels - 10/05/2011

Location Start Time LAeq,15min (dB) LAF90,15min(dB)

1 02:00 38.1 35.0

2 02:12 39.2 35.6

3 02:26 37.4 35.2

1 02:39 36.9 34.6

2 02:51 38.3 35.2

3 03:04 34.9 30.8

1 03:17 36.3 33.8

2 03:34 39.2 36.6

3 03:43 37.5 35.0

1 03:56 38.8 36.02 04:04 41.8 38.6

3 04:12 53.3 41.0

Daytime noise levels - 09/05/2011

Location Start Time LAeq,15min (dB) LAF90,15min(dB)

1 19:04 49.8 46.2

2 19:27 49.0 45.6

3 19:39 50.6 43.4

1 19:52 48.0 43.82 20:05 49.0 42.8

3 20:19 50.6 41.8

1 20:32 46.7 42.2

2 20:45 46.6 42.4


12/12






Tel: 0114 228 3540

Appendix III Proposed Site Layout

Figure 2 Proposed Location new Primary Care Centre

Noise Impact Assessment 3 (1)

Documents