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Proposed Lidl Food Store
Seaward Way
Minehead
Noise & Acoustic Report for BREEAM 2011
Reference: 5861/B/BL/pw January 2015
Acoustic Consultants Limited
Project: 5861 (Proposed Lidl Food Store, Seaward Way, Minehead - Noise and Acoustic Report for BREEAM 2011)
Date: 19th January 2015
2
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Proposed Lidl Food Store, Seaward Way, Minehead
Noise and Acoustic Report for BREEAM 2011
Client Lidl UK
Locking Castle Business Park
West Wick
Weston-super-Mare
BS24 7TG
Architect Lapworth Architects
Somerville House
20-22 Harbourne Road
Edgbaston
Birmingham
B15 3AA
Noise & Acoustic Consultant Acoustic Consultants Limited
Raleigh House
Wellsway
Keynsham
Bristol
BS31 1HS
Prepared By Checked By
Blake Lucas BEng. (Hons), MIOA Daniel Oldaker BSc. (Hons), MIOA
Issue Number Date
1st Issue 25th November 2014
Revision ‘A’ 19th January 2015
Acoustic Consultants Limited
Project: 5861 (Proposed Lidl Food Store, Seaward Way, Minehead - Noise and Acoustic Report for BREEAM 2011)
Date: 19th January 2015
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Proposed Lidl Food Store, Seaward Way, Minehead
Noise and Acoustic Report for BREEAM 2011
INDEX
PAGE
1.0 Introduction 4
2.0 BREEAM 2011 5
3.0 Noise Measurements 7
4.0 HEA 05 First Credit – Internal Noise Levels 10
5.0 HEA 05 Second Credit – Reverberation Time 14
6.0 POL 05 – Plant Noise 16
7.0 Limitations 18
8.0 Summary and Conclusions 19
Acoustic Consultants Limited
Project: 5861 (Proposed Lidl Food Store, Seaward Way, Minehead - Noise and Acoustic Report for BREEAM 2011)
Date: 19th January 2015
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1.0 INTRODUCTION
Lidl UK appointed Acoustic Consultants Limited to provide advice on the noise and
acoustic issues for the proposed food store on Seaward Way, Minehead.
This report is based on the information and layout contained on the Lapworth
Architects Limited drawings entitled “Site Plan as Proposed” with the drawing
number 1470 03 and dated December 2014.
The author of this report is a Full Member of the Institute of Acoustics (MIOA) with a
recognised acoustic qualification and over seven years’ experience within the field of
noise and acoustics and as such meets the BREEAM definition of a suitably qualified
acoustic consultant.
The report provides noise and acoustic advice which aims to achieve the
requirements of the BREEAM 2011 credits Hea 05 and Pol 05.
This report addresses the following elements:
A) External Noise Control
B) Internal Room Acoustics
C) Plant Noise
The report has been prepared in good faith, with all reasonable skill and care, based
on information provided or available at the time of its preparation and within the
scope of work agreement with the Client. We disclaim any responsibility to the Client
and others in respect of any matters outside the scope of the above.
The relevant design criteria are set out in BREEAM 2011. The requirements of the
BREEAM 2011 credits Hea 05 and Pol 05 are as follows:
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Project: 5861 (Proposed Lidl Food Store, Seaward Way, Minehead - Noise and Acoustic Report for BREEAM 2011)
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2.0 BREEAM 2011
For a retail building the development would be classed as an ‘Other’ building type.
For a building of this type there are three credits available two in Hea 05 and one in
Pol 05. The credits are outlined below:
2.1 Hea 5
First Credit
The requirements of Hea 5 Credit 1 are as follows:
Room
Function:
All room functions
Criteria: Indoor ambient noise levels comply with the “good practice”
criteria levels of BS8233:1999, Tables 5 & 6 (see additional
information section) unless otherwise stated within this table. See
also additional criteria below for sound insulation. Where the
room types below are present, the appropriate requirements for
sound insulation must also be achieved.
Credits: 1
Testing
Requirement:
A suitably qualified acoustician carries out pre-completion acoustic
testing to ensure that the relevant spaces (as built) achieve the
required performance standards. Where testing identifies that
spaces do not meet the standards, remedial works are carried out
prior to handover and occupation.
Notes: For the purposes of acoustic measurement and calculation these
spaces should be considered unoccupied. Typical, appropriate
noise levels are given in the table below (additional information
section); the list is not intended to be exhaustive.
Acoustic Consultants Limited
Project: 5861 (Proposed Lidl Food Store, Seaward Way, Minehead - Noise and Acoustic Report for BREEAM 2011)
Date: 19th January 2015
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Second Credit
The requirements of Hea 5 Credit 2 are as follows:
Room
Function:
Rooms/areas used for speech or performance, including public
speaking
Criteria:
Achieve reverberation times compliant with Table 8 of BS8233
1999. In addition, or alternatively, if relevant to assessed building;
classrooms, seminar rooms and lecture theatres achieve
reverberation times compliant with Table 1.5 of Building
Bulletin 93
Credits: 1
Testing
Requirement: As above
Notes:
Where the reverberation time required by the relevant standard is
not appropriate for the type of space/building assessed, the
acoustician must confirm why this is the case. In addition the
acoustician must set alternative appropriate reverberation times
and provide these to demonstrate compliance.
2.2 Pol 5
There is one credit available within Pol 5 and the credit refers to noise from a
development affecting sensitive receivers around a site. The following outlines the
requirements of Pol 05 of BREEAM 2011.
1. The credit can be awarded by default where there are or will be no noise-
sensitive areas or buildings within 800m radius of the assessed development.
2. Where there are or will be noise-sensitive areas or buildings within 800m
radius of the assessed development a noise impact assessment in compliance
with British Standard 7445:1991 has been carried out and the following noise
levels measured/determined:
a. Existing background noise levels at the nearest or most exposed
noise-sensitive development to the proposed development or at a
location where background conditions can be argued to be similar.
b. The rating noise level resulting from the new noise-source (see also
Compliance note: Compliance at the design stage).
3. The noise impact assessment must be carried out by a suitably qualified
acoustic consultant holding a recognised acoustic qualification and
membership of an appropriate professional body (see relevant definitions in
the Additional Information section).
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4. The noise level from the proposed site/building, as measured in the locality
of the nearest or most exposed noise-sensitive development, is a difference
no greater than +5dB during the day (0700hrs to 2300hrs) and +3dB at night
(2300hrs to 0700hrs) compared to the back-ground noise level.
5. Where the noise source(s) from the proposed site/building is greater than
the levels described in criterion 4, measures have been installed to attenuate
the noise at its source to a level where it will comply with criterion 4.
3.0 NOISE MEASUREMENTS
3.1 Monitoring Equipment
Sound Pressure Levels were measured using a Class 1 Sound Level Meter with half-
inch condenser microphones using the "fast" setting. The equipment is checked
annually using a Quality System meeting the requirements of British Standard EN
ISO/IEC 17025:2005 and in accordance with British Standard EN 10012:2003 and
traceable to the National Standards. This equipment was checked and calibrated as
noted below and the certificates are available for inspection.
Table 1: Monitoring Equipment
Equipment Description /
Manufacturer / Type
Serial
number
Date of
calibration
Calibration
Certification
Number
Sound Level Meter, Cirrus Research, CR:171C G068150 25/09/14 222114
Calibrator, Cirrus Research, CR:515 73217 22/09/14 100253
Microphone, Cirrus Research, MK224 201104A 25/09/14 222114
Sound Level Meter, B & K Type 2250-A 3000994 18/03/14 K072240
Pre-Amplifier, B & K , Type ZC0032 14611 18/03/14 K072240
Microphone, B & K, Type 4189 2638388 18/03/14 K072240
Calibrator, B&K Type 4231 1934013 18/03/14 K072796
The measuring systems were checked for calibration before and after the tests which
gave a 0.1 drift however this drift is not significant enough to affect any of the
results.
The monitoring was carried out in clear conditions with a daytime air temperature of
about 12 degrees Centigrade and with little or no wind. These conditions are not
expected to have a significant adverse effect on the measured levels.
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3.2 Monitoring Procedure
An assessment to Hea 5 requires the daytime equivalent noise levels to be
established at locations representative of the façade of the development. An
assessment for Pol 5 requires that the "Background Noise Level" typical for the area,
be established.
The monitoring locations are as follows:
Figure 1: Monitoring Locations & Nearest Sensitive Receiver
A daytime road traffic noise monitoring was carried out at location ‘A’ which was
representative of the most exposed façade to road traffic noise along Seaward Way
between 17:05 hours on 17:35 hours on the 27th October 2014. Location ’A’ was 20
metres back from the edge of Seaward Way. The measured levels at this location are
used to determine the internal ambient noise levels within the sensitive rooms of
the development. The measured levels are free-field levels.
Acoustic Consultants Limited
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Noise monitoring was undertaken at Location ‘B’ between 23:00 hours on
18th November 2014 and finished at 00:00 hours on the 19th November 2014. Noise
monitoring was undertaken in accordance with British Standard 7445:1991. The
monitoring location ‘B’ was outside the most sensitive residential properties, to
south of the site along Hayfield Close (R1) approximately 230 metres away from the
proposed plant and delivery bay location and in a free-field position. The monitoring
location is considered representative of the most sensitive receivers around the site.
The measured levels are free-field levels.
3.3 Measured Data
3.3.1 Road Traffic Noise Levels
From the measured data the road traffic noise levels have been determined as
follows 20 metres from the road in a free-field position.
Table 2: Measured Equivalent Noise Level (LAeq (T))
Location Parameter Measured
Level
A LAeq (30 minutes) dB 59
3.3.2 Baseline Background Noise Levels
The measured baseline noise levels were determined primarily by distant and local
road traffic on the surrounding highway network. There were no other significant
sources of noise at them monitoring location.
The measured data consists of the Equivalent Noise Level (LAeq (15minute)), and
Background Noise Level (LA90 (15minute)) in dB (A). The results are provided below:
Table 3: Measured Noise Levels
Start Time Period LAeq(T) dB LA90 dB
23:00 00:15:00 46 33
23:15 00:15:00 40 34
23:30 00:15:00 38 33
23:45 00:15:00 40 33
The typical measured background noise level at the worse case time (night-time) is
33 dB LA90 (15 minutes) (free-field level).
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4.0 HEA 05 FIRST CREDIT - INTERNAL NOISE LEVELS
4.1 Criteria
To achieve the first credit of BREEAM 2011 Hea 05 all rooms of the development
need to achieve internal ambient noise levels that comply with the “good practice”
criteria levels of British Standard 8233:1999, Tables 5 & 6. The relevant criteria
derived from Tables 5 and 6 of British Standard 8233:1999 are provided below:
Table 4: Maximum Indoor Ambient Noise Levels
Type of Room Criteria LAeqT
Shop Floor 50-55 dB
Toilets 45-55 dB
Staff Room 35-45 dB
Office 40-50 dB
This is in respect to noise from external sources outside (such as road traffic) and
building services. The main source of noise at present affecting the site is road traffic
noise from the local road network, as such a noise survey has been undertaken.
4.2 Predicted Noise Level
The development has been rationalised into two façades, the road facing façade and
rear façade. The road facing façade (Façade A) and the rear façade (Façade B). The
façade locations are as follows:
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Figure 2: Façade Locations
Along Façade A the design octave band equivalent noise levels are as measured at
Location ‘A’. Along Façade B the design octave band equivalent noise levels are as
measured at Location ‘A’ with a 10 dB barrier correction due to the shielding of the
store from road traffic along Seaward Way. The octave band façade design levels
along each façade (A-B) are provided in the table below:
Table 5: Design Octave Band Façade Equivalent Noise Level (Leq (T))
Façade Frequency (Hertz)
dB(A) 63 125 250 500 1k 2k 4k
Leq(t) dB A 67 66 58 53 56 51 41 59
B 57 56 48 43 46 41 31 49
4.3 Building Façade Design
The building fabric construction and ventilation provisions should be designed such
that the internal noise levels do not exceed the British Standard 8233 criteria in
Table 3 above within all spaces of the development.
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The following sections assess the sound insulation of the proposed building and
provide advice on the construction of the buildings to control external noise based
on the noise modelling results. It is proposed that the following building construction
elements be incorporated into the design of all external façades and roof unless
otherwise stated.
4.3.1 External Walls
The external walls comprise of 365 millimetre Fire Clay Insulated Building Blocks
(Poroton cellular block). The walls are either to be rendered with a 20 millimetre
render or alternatively clad in a metal rain screen cladding.
With all joints and cavities in the block fully filled with mortar we would expect this
construction to achieve the following minimum sound reduction indices:
Table 6: Expected Sound Reduction Indices of External Walls
Frequency (Hz) 63 125 250 500 1k 2k 4k
SRI (dB) 40 40 42 45 56 66 73
4.3.2 Roof Construction
The roof is of a light weight construction comprising a 0.9 millimetre steel outer skin
with 250 millimetre of mineral wool compressed to 235 millimetres within the cavity
and a 0.7 millimetre inner skin all on steel purlins.
From the supplied manufacturers test data this construction is expected to achieve
the following minimum sound reduction indices:
Table 7: Expected Sound Reduction Indices of Roof
Frequency (Hz) 63 125 250 500 1k 2k 4k
SRI (dB) 14 22 30 37 43 55 60
In addition beneath the roof a sound absorbent ceiling will be installed comprising of
OWAcoustic mineral fibre ceiling tiles in a metal grid.
4.3.3 Windows & Glazed Doors
There are glazed external windows to the Shop front, staff room, managers office
and customer toilet lobby only.
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Shop Floor
The proposed glazing on the shop floor comprises of a double glazed unit of
6.4 millimetre laminate glass a 16 millimetre cavity and a final layer of 6.4 millimetre
laminated glazing. This construction is expected to achieve the following sound
reduction indices:
Table 8: Expected Sound Reduction Indices of Shop Floor Glazing
Frequency (Hz) 63 125 250 500 1k 2k 4k
SRI (dB) 16 21 20 31 39 37 47
Staff Room
The proposed glazing on to the staff room comprises of a double glazed unit. The
glazing will need to achieve the following minimum sound reduction indices:
Table 9: Expected Sound Reduction Indices of Staff Room Glazing
Frequency (Hz) 63 125 250 500 1k 2k 4k
SRI (dB) 15 20 19 29 38 36 45
This could be achieved with a double glazed unit of 6 millimetre glass a 12 millimetre
cavity and a final layer of 6 millimetre glazing. The supplier should verify the
performance.
4.3.4 Ventilation
All spaces of the development are to be mechanically ventilated. The ventilation
system will need to be suitably attenuated to ensure external noise is controlled.
To control external noise we would advise that the ventilation system is fitted with
an atmospheric side attenuator that achieves a sound level difference of at least
25 dB(A) outside to inside.
In addition the ventilation and air conditioning system will need to be designed to
ensure building services noise does not impact on the overall noise levels within the
spaces of the development. Noise from all building services should not exceed the
following plant noise limits within the sensitive spaces of the development:
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Table 10: Maximum Building Services Noise Levels
Type of Room Criteria LAeqT
Shop Floor 45 dB
Toilets 45 dB
Staff Room 35 dB
Office 40 dB
4.4 Compliance with BREEAM
With the proposed external building façade constructions, ventilation provisions
detailed above the predicted internal noise levels are within the criteria of British
Standard 8233:1999 and as such the criteria in the First Credit of BREEAM Hea 5 is
achieved.
5.0 HEA 05 SECOND CREDIT – REVERBERATION TIME
5.1 Criteria
The second Hea 5 credit applies to the control of reverberation in areas used for
speech or performance. There is a requirement to comply with the reverberation
time limits from Table 8 of British Standard 8233.
The limits considered relevant to the proposed Lidl store are described below
(derived from Table 8 of British Standard 8233) and are dependant on the room
volume of the space. The Reverberation Time criteria is at 500 Hertz only.
Table 11: Maximum Reverberation Time at 500 Hertz
Type of Room Reverberation Time
T500 Hz (seconds)
Shop Floor 1.3
Staff Room 0.4
Office 0.4
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5.2 Reverberation Time Control
5.2.1 Shop Floor
The space has a volume of approximately 5376 metres cubed. The proposed internal
finishes and corresponding areas are given in the table below:
Floor 1344 square metres Hard floor finish
Ceiling 1344 square metres OWAcoustic Ceiling tiles
Walls 611 square metres Plastered walls
Doors 10 square metres Timber
Windows 63 square metres Glazing
It is proposed to install a suspended mineral fibre ceiling throughout the space. The
proposed ceiling is the OWAcoustic Constellation Ceiling tile.
From the data supplied by OWAcoustic the Constellation tile achieves the following
minimum sound absorption coefficients in the mid frequency octave bands:
Octave Band 125 250 500 1k 2k 4k
Minimum Absorption coefficient 0.27 0.53 0.59 0.75 0.83 0.75
Any alternative method of providing sound absorption on the ceiling should achieve
the minimum sound absorption coefficients and area stated above. The supplier
should verify the performance data.
With the construction and finishes stated above the predicted ‘T 500 Hz’ is within the
required <1.3 seconds.
5.2.2 Staff Room
To be advised once provided with a building layout.
5.2.3 Office
To be advised once provided with a building layout.
5.3 Compliance with BREEAM
With the proposed constructions and suitable mitigation measures the predicted
Reverberation Time are within the criteria of British Standard 8233:1999 stated
above and as such the criteria in the Second Credit of BREEAM Hea 5 is achieved.
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6.0 POL 05 - PLANT NOISE
The BREEAM credit POL 05 requires noise emitted from the site to be controlled.
The main noise emitting elements consist of the building services plant.
6.1 Proposed Scheme
The proposal is for a Lidl Food Store located on the site of the vacant Aquasplash
site. The site is located off Seaward Way Minehead with a Tesco store to south,
Seaward Way to the north, Brereton Road to the south and a number of small
industrial units around the site.
The plant associated with the Lidl food Store will be located on the southern and
elevation of the store and will operate 24-hours a day according to demand.
The most sensitive receiver are the residential properties, in terms of plant noise are
the three storey apartments to south of the site along Hayfield Close (R1)
approximately 230 metres away from the proposed plant location. All other
residential dwellings are either at a further distance away from the plant or shielded
from the noise by the store.
6.2 Proposed Plant
The majority of plant is to be located on the southern elevation of the store within
the delivery bay at 3 metres above the ground. The bakery chiller is located
internally with external louvers to the play enclosure; these are not considered to
provide any significant degree of sound insulation. The Refrigeration unit is located
on the western façade of the building.
The following table provides a schedule of the proposed plant along with the
individual unit sound pressure level at a given distance in a free-hemispherical field.
The noise data is taken directly from the manufacturer’s noise data as supplied by
Lidl.
Table 12: Proposed Plant
Plant Type Manufacturer Model Number Quantity
Individual Unit
Sound Pressure
Level LAeq(T)
Refrigeration Basetec GFV 080.3A/3-L(S)-F6/4P 1 42 dB at 10 metres
Bakery Rivacold Deutschland THCL145Z-ZF13-EVI 1 41 dB at 10 metres
Air conditioning Mitsubishi FDC200VS 1 57 dB at 1 metres
Air conditioning Mitsubishi FDC250VS 2 58 dB at 1 metres
Air conditioning Mitsubishi FDC112KXEN6 1 54 dB at 1 metres
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Any alternative plant should have an equal or lower noise emission level (dB) in a
hemispherical free-field.
6.3 Predicted Noise Level
Plant noise levels at the nearby residential properties have been predicted based on
the plant noise levels and distance correction of a point source.
The most sensitive residential properties to the south of the site along Hayfield Close
(R1) approximately 230 metres away from the proposed plant and delivery bay
location.
The noise sources will include reflections off the building which will increase the
noise emission level by about 3 dB.
Between Receiver R1 and the plant there are a significant number of industrial units
that will shield the plant from the receivers as such we have applied a barrier
correction of 10 dB to the receivers to the south. In reality we would expect a higher
barrier attenuation to occur.
The following tables provide the corrections to the stated manufacturer’s noise
levels to determine plant noise levels at the nearby residential properties.
Table 13: Predicted noise levels at R1
Unit
Manufacturers
Sound Pressure
Level LAeq(T)
Distance
Correction
To R1
Reflection Barrier
Correction
Predicted
Level at R1
LAeq (15 minutes)
Refrigeration Plant 42 dB(A) @ 10m -27 dB +3 dB -10 dB 8 dB(A)
FDC200VS 57 dB(A) @ 1m -47 dB + 3 dB -10 dB 3 dB(A)
FDC250VS 58 dB(A) @ 1m -47 dB + 3 dB -10 dB 4 dB(A)
FDC250VS 58 dB(A) @ 1m -47 dB + 3 dB -10 dB 4 dB(A)
FDC112KXEN6 54 dB(A) @ 1m -47 dB + 3 dB -10 dB 0 dB(A)
Bakery Plant 41 dB(A) @ 10m -27 dB + 3 dB -10 dB 7 dB(A)
This results in a predicted cumulative free-field specific noise level of 13 dB
LAeq (15 minutes) at R1 which is very low.
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6.4 Plant Noise Assessment
The plant will operate on a 24-hour basis according to demand. A night-time British
Standard 7445:1991 assessment has been undertaken at the sensitive receivers
around the site at the worse case time.
The predicted specific noise is 20 dB lower than the background noise level and as
such we would expect any tonality, intermittency impulsivity of the plant will not be
distinguishable at the sensitive receivers and an acoustic character correction is not
applicable in this case. The British Standard 7445:1991 assessment is as follows:
Table 14: British Standard 7445:1991 Assessment
Location R1
Background Level, LA90 15 minutes 33 dB
Specific Noise Level, LAeq 15 minutes 13 dB
Acoustic Character Correction +0 dB
Rating Level LAr 15 minutes 13 dB
Excess of rating over background level -20 dB
This means that the plant rating noise level will be at least -20 dB below the
background noise level at the receiver R1 during worse case time and as such it is
indication that noise from the plant will be of a low impact on the noise sensitive
receivers in the area and the BREEAM Pol 5 criteria is achieved.
7.0 LIMITATIONS
The report limits itself to addressing solely on the noise control and acoustic aspects
as included in this report. We provide advice only in relation to noise and acoustics.
The report has been prepared in good faith, with all reasonable skill and care, based
on information provided or available at the time of its preparation and within the
scope of work agreement with the Client. We disclaim any responsibility to the Client
and others in respect of any matters outside the scope of the above.
The report is provided for the sole use of the named Client and is confidential to
them and their professional advisors. No responsibility is accepted to other parties.
It should be noted that noise predictions are based on the current information as we
understand it and on the performances noted in this report. Any modification to
these parameters can alter the predicted level. All predictions are in any event
subject to a degree of tolerance of normally plus or minus three decibels. If this
tolerance is not acceptable, then it would be necessary to consider further
measures.
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8.0 SUMMARY AND CONCLUSIONS
Lidl UK appointed Acoustic Consultants Limited to provide advice on the noise and
acoustic issues for the proposed food store at Seaward Way, Minehead.
The proposed development comprises of Lidl food Store. The store will consist of a
retail area, warehouse, welfare area and office.
The brief was to undertake internal ambient noise levels and reverberation time
calculations and also plant noise calculations to determine compliance with BREEAM
2011 credits Hea 5 and Pol 5.
With the proposed external building façade constructions, ventilation provisions
detailed above the predicted internal noise levels are within the criteria of British
Standard 8233:1999 and as such the criteria in the First Credit of BREEAM Hea 5 is
achieved.
With the proposed constructions and suitable mitigation measures the predicted
Reverberation Time are within the criteria of British Standard 8233:1999 and as such
the criteria in the Second Credit of BREEAM Hea 5 is achieved.
With the proposed plant the predicted rating noise levels are within the
BREEAM Pol 5 criteria and the credit can be achieved.