Tesco Express 118 Heath Road - Coxheath ME17 4PN - Planning Alerts | UK
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Tesco Express
118 Heath Road
Coxheath
ME17 4PN
Plant Noise
Impact Assessment
On behalf of
Project Reference: 89116 | Revision: - | Date: 13th January 2021
T: 01252 519881
W: noisesolutions.co.uk
E: hello@noisesolutions.co.uk
Noise Solutions Ltd, 5 Oriel Court, Omega Park, Alton, GU34 2YT Reg no. 3483481
89116 Plant Noise Impact Assessment Report
Tesco Express, 118 Heath Road, Coxheath
Document Information
Project Name : Tesco Express, 118 Heath Road, Coxheath
Project Reference : 89116
Report Title : Plant Noise Impact Assessment Report
Doc Reference : 89116/NIA
Date : 13th January 2021
Name Qualifications Initials Date
Prepared by: Adam Meakins AMIOA AM 13th January 2021
Reviewed and Nigel
BSc(Hons) MIOA NAC 13th January 2021
approved by: Chandler
For and on behalf of Noise Solutions Ltd
Reviewed/
Revision Date Description Prepared
Approved
Noise Solutions Ltd (NSL) disclaims any responsibility to the Client and others in respect of any matters outside the scope of this
report. This report has been prepared with reasonable skill, care and diligence within the terms of the Contract with the Client and
generally in accordance with the appropriate ACE Agreement and taking account of the manpower, resources, investigations and
testing devoted to it by agreement with the Client. This report is confidential to the Client and NSL (Noise Solutions Ltd) accepts no
responsibility of whatsoever nature to third parties to whom this report or any part thereof is made known. Any such party relies
upon the report at their own risk.
© Noise Solutions Ltd (NSL) 2021
Reg no. 3483481 Trading office, 5 Oriel Court, Omega Park, Alton, GU34 2YT
Page i89116 Plant Noise Impact Assessment Report
Tesco Express, 118 Heath Road, Coxheath
Contents
1.0 Introduction .................................................................................................................................... 1
2.0 Details of development proposals ................................................................................................ 1
3.0 Nearest noise sensitive receptors ................................................................................................. 1
4.0 Existing noise climate .................................................................................................................... 2
5.0 Plant noise design criteria ............................................................................................................. 2
Maidstone Borough Council .....................................................................................................................................2
Proposed criteria ...........................................................................................................................................................2
6.0 Plant noise impact assessment...................................................................................................... 3
7.0 Summary ......................................................................................................................................... 4
Appendices
Acoustic terminology
Plant information and manufacturer published sound power levels
Aerial photograph site showing areas of interest
Environmental sound survey
Appendix E Noise level predictions
Page ii89116 Plant Noise Impact Assessment Report
Tesco Express, 118 Heath Road, Coxheath
1.0 Introduction
1.1. Noise Solutions Ltd (NSL) has been commissioned by Stace LLP to undertake a noise impact
assessment for new plant serving the proposed Tesco Express store located at No 118 Heath Road
in Coxheath.
1.2. An environmental sound survey has been undertaken to establish the prevailing background
sound pressure levels at a location representative of the sound levels outside the nearest noise
sensitive receptors to the site.
1.3. Cumulative plant noise emission levels for the proposed plant have been predicted at the most
affected noise sensitive receptors and assessed using the requirements of Maidstone Borough
Council.
1.4. To assist with the understanding of this report a glossary of acoustic terms can be found in
Appendix A. An in-depth glossary of acoustic terms can be viewed online at www.acoustic-
glossary.co.uk.
2.0 Details of development proposals
2.1. The Tesco Express store will be located on the ground floor of an extended mixed-use building
at No 118 Heath Road in Coxheath. There is a residential flat above the existing restaurant unit.
2.2. Refrigeration and plant serving the store will be located within an external service yard at the
front of the store. ground floor level. Air conditioning (AC) plant will be located at the rear of the
store.
2.3. The proposed refrigeration plant will potentially operate 24 hours a day, although it should be
noted that this unit operates as required to meet demand and that store demands for cooling are
generally reduced at night. The AC units will only operate during store opening hours.
2.4. Appendix B contains a table with the manufacturer’s published sound pressure levels for the
proposed plant.
3.0 Nearest noise sensitive receptors
3.1. The residential dwelling nearest to the proposed plant is the residential flat above the restaurant
(Reference R1) approximately 7m from the proposed refrigeration plant.
3.2. A site plan showing the site and surrounding area, the nearest noise sensitive properties and
noise monitoring location used in this assessment is presented in Appendix C.
Page 189116 Plant Noise Impact Assessment Report
Tesco Express, 118 Heath Road, Coxheath
4.0 Existing noise climate
4.1. An environmental noise survey was undertaken to establish the typical background sound levels
at a location representative of the noise climate outside the façades of the nearest noise sensitive
receptors to the proposed plant area during the quietest times at which the plant will operate.
4.2. The results of the environmental sound survey are summarised in Table 1 below. The full set of
measurement results and details of the survey methodology are presented in Appendix C.
Table 1 Summary of survey results
Range of recorded sound pressure levels (dB)
Measurement period
LAeq(15mins) LAmax(15mins) LA10(15mins) LA90(15mins)
Daytime (07.00 – 23.00 hours) 53-70 71-86 49-76 31-60
Night-time (23.00 – 07.00 hours) 44-63 66-83 35-68 26-46
5.0 Plant noise design criteria
Maidstone Borough Council
5.1. Condition 4 of the planning application 20/502819/FULL from Maidstone Borough Council states:
“Prior to the first use of any plant (including ventilation, extraction, refrigeration and air
conditioning) or ducting system to be used in pursuance of this permission, details of it
shall be submitted to and approved in writing by the Local Planning Authority. The
development shall be carried out in accordance with the approved details thereafter. The
scheme shall ensure that the noise generated at the boundary of any noise sensitive
property shall not exceed Noise Rating Curve NR35 (in areas of low background sound
levels a target of NR30 shall be achieved) as defined by BS8233: 2014 Guidance on sound
insulation and noise reduction for buildings and the Chartered Institute of Building
Engineers (CIBSE) Environmental Design Guide 2006. The equipment shall be maintained
in a condition so that it does not exceed NR35 as described above, whenever it's operating.
After installation of the approved plant, no new plant or ducting system shall be used”.
Proposed criteria
5.2. Based on the Maidstone Borough Council requirements noise emissions from the plant should
be controlled to a level equal to or lower than NR35 at the boundary with the nearest noise
sensitive receptor.
5.3. Table 2 below presents the proposed NR levels at the boundary with the nearest residences.
Page 289116 Plant Noise Impact Assessment Report
Tesco Express, 118 Heath Road, Coxheath
Table 2 Plant noise limits at the boundary with the nearest noise sensitive receptor
Sound pressure level (dB) at octave band centre frequencies (Hz)
NR
Period
Level
63 Hz 125Hz 250Hz 500Hz 1kHz 2kHz 4kHz 8kHz
Day (07:00-
63 52 45 39 35 32 30 28 35
22:00)
Night (22:00-
63 52 45 39 35 32 30 28 35
07:00)
6.0 Plant noise impact assessment
6.1. The cumulative plant noise level at the most affected noise sensitive receptor has been predicted
based on manufacturer’s noise data for the existing and proposed equipment. The assessment
has taken into consideration distance attenuation, screening and directivity. The predictions
during the daytime period have been based on the proposed refrigeration plant and AC unit
operating at full capacity. Night-time predictions have been based upon the refrigeration plant
being the only items in operation.
6.2. It should be noted that the proposed plant is not anticipated to exhibit any tonal or impulsive
characteristics providing it is well maintained. All proposed plant will be inverter driven and,
therefore, will gently ramp up and down depending on the demands on the various systems.
6.3. Table 3 summarises the results of the assessment at the most affected properties. All other nearby
receptors benefit from increased distance/screening to the plant such that resulting noise levels
will be lower than at the receptors considered. The full set of calculations can be found in
Appendix E.
Table 3 Assessment of noise levels at nearby receptor due to plant
Predicted NR level Criteria NR
Receptor Period Difference
at receptor level
Daytime period
(07.00 – 23.00 34 35 -1
hours)
R1
Night-time period
(23.00 – 07.00 29 35 -6
hours)
6.4. The noise level predictions demonstrate that cumulative noise emissions from the proposed plant
will comply with the proposed limits at the nearest noise sensitive receptor.
Page 389116 Plant Noise Impact Assessment Report
Tesco Express, 118 Heath Road, Coxheath
7.0 Summary
7.1. Noise Solutions Ltd has been commissioned by Stace LLP to undertake a noise impact assessment
for new plant serving the proposed Tesco Express store located at No 118 Heath Road in
Coxheath.
7.2. An environmental noise survey has been undertaken to establish the existing prevailing noise
levels at locations representative of the noise climate outside the nearest noise sensitive receptors
to the proposed plant area.
7.3. The cumulative plant noise emission levels for the proposed plant (incorporating noise control
measures) have been predicted at the most affect noise sensitive receptor locations and assessed
taking into consideration the requirements provided by Maidstone Borough Council. Condition 4
of the planning application 20/502819/FULL should, therefore, be discharged.
Page 489116 Plant Noise Impact Assessment Report
Tesco Express, 118 Heath Road, Coxheath
Acoustic terminology
Parameter Description
Ambient Noise The totally encompassing sound in a given situation at a given time, usually
Level composed of a sound from many sources both distant and near (LAeq,T).
Decibel (dB) A scale for comparing the ratios of two quantities, including sound pressure
and sound power. The difference in level between two sounds s1 and s2 is
given by 20 log10 (s1/s2). The decibel can also be used to measure absolute
quantities by specifying a reference value that fixes one point on the scale. For
sound pressure, the reference value is 20Pa. The threshold of normal hearing
is in the region of 0 dB and 140 dB is the threshold of pain. A change of 1 dB is
only perceptible under controlled conditions.
dB(A), LAx Decibels measured on a sound level meter incorporating a frequency weighting
(A weighting) which differentiates between sounds of different frequency
(pitch) in a similar way to the human ear. Measurements in dB(A) broadly agree
with people’s assessment of loudness. A change of 3 dB(A) is the minimum
perceptible under normal conditions, and a change of 10 dB(A) corresponds
roughly to halving or doubling the loudness of a sound. The background noise
in a living room may be about 30 dB(A); normal conversation about 60 dB(A) at
1 metre; heavy road traffic about 80 dB(A) at 10 metres; the level near a
pneumatic drill about 100 dB(A).
Fast Time Setting on sound level meter, denoted by a subscript F, that determines the
Weighting speed at which the instrument responds to changes in the amplitude of any
measured signal. The fast time weighting can lead to higher values than the
slow time weighting when rapidly changing signals are measured. The average
time constant for the fast response setting is 0.125 (1/8) seconds.
Free-field Sound pressure level measured outside, far away from reflecting surfaces
(except the ground), usually taken to mean at least 3.5 metres
Façade Sound pressure level measured at a distance of 1 metre in front of a large
sound reflecting object such as a building façade.
LAeq,T A noise level index called the equivalent continuous noise level over the time
period T. This is the level of a notional steady sound that would contain the
same amount of sound energy as the actual, possibly fluctuating, sound that
was recorded.
Lmax,T A noise level index defined as the maximum noise level recorded during a noise
event with a period T. Lmax is sometimes used for the assessment of occasional
loud noises, which may have little effect on the overall Leq noise level but will
still affect the noise environment. Unless described otherwise, it is measured
using the 'fast' sound level meter response.
L10,T A noise level index. The noise level exceeded for 10% of the time over the
period T. L10 can be considered to be the "average maximum" noise level.
Generally used to describe road traffic noise. LA10,18h is the A –weighted
arithmetic average of the 18 hourly LA10,1h values from 06:00-24:00.
L90,T A noise level index. The noise level that is exceeded for 90% of the
measurement time interval, T. It gives an indication of the lower levels of
fluctuating noise. It is often used to describe the background noise level and
can be considered to be the “average minimum” noise level and is a term used
to describe the level to which non-specific noise falls during quiet spells, when
there is lull in passing traffic for example89116 Plant Noise Impact Assessment Report
Tesco Express, 118 Heath Road, Coxheath
Plant information and manufacturer published sound power levels
Sound power level (dB) at octave band centre frequencies (Hz)
No. of dBA
Plant Unit/Model Description
units (dB)
63 125 250 500 1000 2000 4000 8000
Sound
pressure
39 33 36 31 28 25 21 13 34
level at 10m
Space eCO2 day
Refrigeration 1
packaged Sound
pressure
34 28 31 26 23 20 16 8 29
level at 10m
night
Sound
Daikin/AZAS
AC 2 pressure 53 55 52 53 48 46 38 32 54
140MV1
level at 1m
Sound
Daikin/
AC 1 pressure 49 49 47 45 41 36 30 24 46
RXP25M
level at 1m89116 Plant Noise Impact Assessment Report
Tesco Express, 118 Heath Road, Coxheath
Aerial photograph site showing areas of interest
Receptor R1
Environmental survey
location
AC Plant location
Refrigeration plant
location89116 Plant Noise Impact Assessment Report
Tesco Express, 118 Heath Road, Coxheath
Environmental sound survey
Details of sound surveys
D.1 Measurements of the existing background sound levels were undertaken between 14.30 hours
on Tuesday 22nd December to 11.45 hours on Wednesday 23rd December 2020.
D.2 The sound level meter was programmed to record the A-weighted Leq, L90, L10 and Lmax noise
indices for consecutive 15-minute sample periods for the duration of the noise survey.
Measurement position
D.3 The representative measurement position was located on a lamppost on Clock House Rise
(location indicated on the site plan in Appendix C).
D.4 In accordance with BS 7445-2:1991 ‘Description and measurement of environmental noise –
Part 2: Guide to the acquisition of data pertinent to land use’, the measurements were
undertaken under free-field conditions.
Equipment
D.5 Details of the equipment used during the survey are provided in the table below. The sound
level meter was calibrated before and after the survey; no significant change (+/-0.2 dB) in the
calibration level was noted.
Environmental noise survey
Calibration Calibration
Description Model / serial no.
date certificate no.
Class 1 Sound level meter Rion NL-52 / 00654035
Condenser microphone Rion UC-59 /08290 29/05/2019 UCRT19/1634
Preamplifier Rion NH-25 / 54080
Calibrator Rion NC-74 /34235932 20/08/2020 TCRT20/1469
Weather Conditions
D.6 Weather conditions were determined both at the start and on completion of the survey. It is
considered that the meteorological conditions were appropriate for environmental noise
measurements. The table below presents the weather conditions recorded on site at the
beginning and end of the survey.89116 Plant Noise Impact Assessment Report
Tesco Express, 118 Heath Road, Coxheath
Weather Conditions
Measurement Beginning of End of
Time/Date Description
Location Survey Survey
14.30 22 Dec –
As indicated on
11.45 23 Dec Temperature (°C) 12 12
Appendix C
2020
Precipitation: No No
Cloud cover (oktas - see
8 7
guide)
Presence of fog/snow/ice No No
Presence of damp
No No
roads/wet ground
Wind Speed (m/s)89116 Plant Noise Impact Assessment Report Tesco Express, 118 Heath Road, Coxheath
89116 Plant Noise Impact Assessment Report
Tesco Express, 118 Heath Road, Coxheath
Appendix E Noise level predictions
Leq (dB) LAeq
Description Notes NR
63Hz 125Hz 250Hz 500Hz 1kHz 2kHz 4kHz 8kHz (dB)
DAYTIME
Cumulative AC day Lp @ 1m 57 59 56 56 51 49 41 35 57
Distance attenuation
18 -25 -25 -25 -25 -25 -25 -25 -25
(m)
Directivity correction 3 3 3 3 3 3 3 3 3
Barrier -10 -10 -10 -10 -10 -10 -10 -10 -10
Resultant at receptor Lp @ 18m 25 26 24 24 19 17 9 3 25 20
Cumulative Refrig day Lp @ 10m 39 33 36 31 28 25 21 13 34
Distance attenuation
7 3 3 3 3 3 3 3 3
(m)
Directivity correction 3 3 3 3 3 3 3 3
Barrier 0 0 0 0 0 0 0 0 0
Resultant at receptor Lp @ 7m 45 39 42 37 34 31 27 19 40 34
Cumulative at receptor 45 39 42 37 34 31 27 19 40 34
NIGHT-TIME
Cumulative Refrig night Lp @ 10m 34 28 31 26 23 20 16 8 29
Distance attenuation
7 3 3 3 3 3 3 3 3
(m)
Directivity correction 3 3 3 3 3 3 3 3
Barrier 0 0 0 0 0 0 0 0 0
Resultant at receptor Lp @ 7m 40 34 37 32 29 26 22 14 35 29
Cumulative at receptor Lp @ 7m 40 34 37 32 29 26 22 14 35 29You can also read
