258-262 Romford Road - Option 1 London - Planning Alerts | UK
←
→
Page content transcription
If your browser does not render page correctly, please read the page content below
258-262 Romford Road – Option 1 London Noise Impact Assessment Report Report 22075.NIA.01 Rev.A PPM Planning 185 Casewick Road West Norwood London SE27 0TA
Report 22075.NIA.01
Revision History
First Issue Date: 03/03/2021
09/03/2021
References to overheating removed and
external building fabric specification updated
A to correspond to the provision of secondary D
glazing
Indication that report specifically addresses
Option 1 of the proposals added
B E
C F
Written by: Checked by: Approved by:
John Gray Duncan Arkley MIOA Kyriakos Papanagiotou MIOA
Graduate Acoustic Consultant Senior Acoustic Consultant Managing Director
Disclaimer
KP Acoustics Ltd. has used reasonable skill and care to complete this technical document, within the terms
of its brief and contract with the resources devoted to it by agreement with the client. We disclaim any
responsibility to the client and others in respect of any matters outside the stated scope. This report is
confidential to the client and we accept no responsibility to third parties to whom this report, or any part
thereof, is made known. KP Acoustics Ltd. accepts no responsibility for data provided by other bodies and
no legal liability arising from the use by other persons of data or opinions contained in this report.
KP Acoustics Ltd. 2021
Contents SUMMARY .................................................................................................................................. 1 1.0 INTRODUCTION ............................................................................................................... 2 2.0 SITE SURVEYS .................................................................................................................. 2 2.1 Site Description ........................................................................................................................... 2 2.2 Environmental Noise Survey Procedure ..................................................................................... 2 2.3 Measurement Positions .............................................................................................................. 3 2.4 Equipment ................................................................................................................................... 4 3.0 RESULTS........................................................................................................................... 4 3.1 Noise Survey................................................................................................................................ 4 4.0 NOISE ASSESSMENT GUIDANCE...................................................................................... 5 4.1 Noise Policy Statement For England 2019 .................................................................................. 5 4.2 The London Plan: Policy D12 Agent of Change ........................................................................... 7 4.3 ProPG: Planning and Noise ......................................................................................................... 8 4.4 BS8233:2014 ............................................................................................................................... 8 4.5 WHO Guidelines for Community Noise (1999) ........................................................................... 9 5.0 COMMERCIAL NOISE IMPACT DISCUSSION .................................................................... 9 6.0 EXTERNAL BUILDING FABRIC SPECIFICATION ............................................................... 10 6.1 Non-Glazed Elements................................................................................................................ 10 6.2 Glazed Elements........................................................................................................................ 11 7.0 VENTILATION STRATEGY ............................................................................................... 12 8.0 CONCLUSION ................................................................................................................. 13 List of Attachments 22075.TH1-4 Environmental Noise Time Histories Appendix A Glossary of Acoustics Terminology
22075.NIA.01 Rev.A 09 March 2021
SUMMARY
KP Acoustics Ltd has been commissioned to assess the suitability of the site at 258-262
Romford Road, Forest Gate, London, E7 9HZ, for a residential redevelopment in accordance
with the provisions of the National Planning Policy Framework and the Noise Policy Statement
for England (NPSE).
This report considers option 1 of the proposals, where only one staircase is proposed.
An environmental noise survey has been undertaken on site in order to establish the current
ambient noise levels with specific consideration given to the impact of commercial noise on
the development, as shown in Table 3.1.
Sound reduction performance calculations have been undertaken in order to specify the
minimum performance required from glazed elements in order to meet the requirements of
BS8233:2014, taking into consideration the non-glazed external building fabric elements. The
results of these calculations and the sound reduction performance requirements for the
glazed elements are shown in Table 5.2.
The noise implications of the ventilation strategy have been considered, with options being
provided to ensure that the ventilation requirements of Approved Document F are achieved.
No further mitigation measures should be required in order to protect the proposed habitable
spaces from external noise intrusion.
22075: 258-262 Romford Road, Forest Gate, London, E7 9HZ Page 1 of 13
Noise Impact Assessment
22075.NIA.01 Rev.A 09 March 2021
1.0 INTRODUCTION
KP Acoustics Ltd has been commissioned by PPM Planning, 185 Casewick Road, West
Norwood, London, SE27 0TA, to assess the suitability of the site at 258-262 Romford Road,
Forest Gate, London, E7 9HZ for a residential redevelopment in accordance with the provisions
of the National Planning Policy Framework and the Noise Policy Statement for England (NPSE).
This report considers option 1 of the proposals, where only one staircase is proposed.
This report presents the results of the environmental survey undertaken in order to measure
prevailing background noise levels and outlines any necessary mitigation measures.
Specific consideration has been given to the impact of noise emissions from nearby
commercial premises.
2.0 SITE SURVEYS
2.1 Site Description
The site is bounded by Romford Road to the north, 252-256 Romford Road to the west, the
property car park followed by Nursery Lane and industrial properties to the south, and
commercial and residential properties to the east. Entrance to the site is located on Romford
Road. At the time of the survey, the background noise climate was dominated by road traffic
noise from Romford Road and noise emissions from industrial properties to the South.
2.2 Environmental Noise Survey Procedure
Four simultaneous noise surveys were undertaken on the proposed site as shown in Figure
2.1. The locations were chosen in order to collect data representative of the worst-case levels
expected on the site due to all nearby sources.
Continuous automated monitoring was undertaken for the duration of the survey between
16:51 on 26/01/2021 and 16:16 on 27/01/2021.
A manual noise measurement was also undertaken on 27/01/2021 in the rear site car park in
order to capture and evaluate noise emissions from the industrial bakery and depot to the
South, identified as the major source of commercial noise observed at the development.
Weather conditions were generally dry with light winds and therefore suitable for the
measurement of environmental noise. The measurement procedure complied with ISO 1996-
2:2017 Acoustics ‘Description, measurement and assessment of environmental noise - Part 2:
Determination of environmental noise levels’.
22075: 258-262 Romford Road, Forest Gate, London, E7 9HZ Page 2 of 13
Noise Impact Assessment
22075.NIA.01 Rev.A 09 March 2021
2.3 Measurement Positions
Measurement positions are as described within Table 2.1 and shown within Figure 2.1.
Icon Descriptor Location Description
The meter was installed on a window on the 2nd floor of
Noise Measurement
the North façade. A correction of 3dB has been applied to
Position 1
account for non-free field conditions
The meter was installed on a window on the 2nd floor of
Noise Measurement
the South façade. A correction of 3dB has been applied to
Position 2
account for non-free field conditions
The Meter was installed internally in the North-West
Noise Measurement corner of the main room on the 2nd floor of the property.
Position 3 The microphone was fixed to a tripod approximately 1.5m
above floor level
The Meter was installed internally, 2.5m from the Eastern
Noise Measurement wall of the main room, on the 2nd floor of the property.
Position 4 The microphone was fixed to a tripod approximately 1.5m
above floor level
The meter was installed 2m above ground level on fencing
Manual Noise in the South- East corner of the rear property car park,
Measurement Position approximately 25m from the nearest point of the nearby
factory
Table 2.1 Measurement positions and descriptions
Figure 2.1 Site measurement positions (Image Source: Google Maps)
22075: 258-262 Romford Road, Forest Gate, London, E7 9HZ Page 3 of 13
Noise Impact Assessment
22075.NIA.01 Rev.A 09 March 2021
2.4 Equipment
The equipment calibration was verified before and after use and no abnormalities were
observed. The equipment used is described within Table 2.2.
Serial
Measurement instrumentation Date Cert no.
no.
Svantek Type 957 Class 1 Sound Level Meter 12398
Aco Pacific 7052E Free-field microphone 64232 27/02/2020 14015014-2
Noise Kit 2
Preamp Svantek SV12L 62632
Svantek External windshield - - -
Svantek Type 958A Class 1 Sound Level Meter 59559
MTG MK250 Free-field microphone 10904 26/09/2019 14012947
Noise Kit 8
Preamp Svantek SV12L 33619
Svantek External windshield - - -
Svantek Type 958A Class 1 Sound Level Meter 45578
Free-field microphone PCB 377B02 169770 15/07/2020 14012950
Noise Kit 9
Preamp PCB 426E01 128280
Svantek External windshield - - -
Svantek Type 958 Class 1 Sound Level Meter 59558 04/10/2019 14012955
Noise & Free-field microphone PCB 377B02 159386
Vibration
Kit 3 Preamp Svantek 2v12L 72191
Svantek External windshield - - -
Larson Davis CAL200 Class 1 Calibrator 17148 07/02/2020 04615/1
Table 2.2 Measurement instrumentation
3.0 RESULTS
3.1 Noise Survey
The LAeq: 5min, LAmax: 5min, LA10: 5min and LA90: 5min acoustic parameters were measured throughout
the duration of the survey. Measured levels are shown as a time history in Figure 22075.TH1-
4.
22075: 258-262 Romford Road, Forest Gate, London, E7 9HZ Page 4 of 13
Noise Impact Assessment
22075.NIA.01 Rev.A 09 March 2021
Measured noise levels at measurement positions 1 and 2 are representative of noise exposure
levels expected to be experienced by all facades of the proposed development. Levels
obtained from positions 3 and 4 are representative of the noise levels currently experienced
inside the development. Results of the surveys conducted at all four measurement positions
are shown in Table 3.1. As discussed in Section 2.2 and Table 2.1 additional manual noise
measurements were conducted in the rear property car park to aid in the evaluation of
commercial noise emissions. The results of these measurements are also given in Table 3.1.
Noise Noise Noise Noise Manual Noise
Measurement Measurement Measurement Measurement Measurement
Time Position 1 Position 2 Position 3 Position 4 Position
Period (Measured (Measured (Measured (Measured (Measured
Noise level – Noise level – Noise level – Noise level – Noise Level –
dBA) dBA) dBA) dBA) dBA)
Daytime
68 61 37 39 60
LAeq,16hour
Night-
time 66 60 33 33 N/A
LAeq,8hour
Table 3.1 Site average noise levels for daytime and night time
It should be highlighted that the levels observed in noise measurement positions 3 and 4
exceed the recommended internal noise guidelines provided by BS8233, which are detailed
further in section 4.4. Consequently, it has been necessary to specify upgrades to the glazing
in order to ensure that the amenity of future residents is protected.
4.0 NOISE ASSESSMENT GUIDANCE
4.1 Noise Policy Statement For England 2019
The National Planning Policy Framework (NPPF) has superseded and replaces Planning Policy
Guidance Note 24 (PPG24), which previously covered issues relating to noise and planning in
England. Paragraph 170 of the NPPF states that planning policies and decisions should aim to:
• prevent new and existing development from contributing to, being put at
unacceptable risk from, or being adversely affected by, unacceptable levels of soil, air,
water or noise pollution or land instability. Development should, wherever possible,
help to improve local environmental conditions such as air and water quality, taking
into account relevant information such as river basin management plans
22075: 258-262 Romford Road, Forest Gate, London, E7 9HZ Page 5 of 13
Noise Impact Assessment22075.NIA.01 Rev.A 09 March 2021
In addition, Paragraph 180 of the NPPF states that ‘Planning policies and decisions should also
ensure that new development is appropriate for its location taking into account the likely
effects (including cumulative effects) of pollution on health, living conditions and the natural
environment, as well as the potential sensitivity of the site or the wider area to impacts that
could arise from the development. In doing so they should’:
• Mitigate and reduce to a minimum potential adverse impacts resulting from noise
from new development – and avoid noise giving rise to significant adverse impacts on
health and the quality of life
• Identify and protect tranquil areas which have remained relatively undisturbed by
noise and are prized for their recreational and amenity value for this reason
The Noise Policy Statement for England (NPSE) was developed by DEFRA and published in
March 2010 with the aim to ‘Promote good health and good quality of life through the
effective management of noise within the context of Government policy on sustainable
development.’
Noise Policy Statement England (NPSE) noise policy aims are as follows:
Through the effective management and control of environmental, neighbour and
neighbourhood noise within the context of Government policy on sustainable development.
• Avoid significant adverse impacts on health and quality of life;
• Mitigate and minimise adverse impacts on health and quality of life; and
• Where possible, contribute to the improvement of health and quality of life
The Noise Policy Statement England (NPSE) outlines observed effect levels relating to the
above, as follows:
• NOEL – No Observed Effect Level
o This is the level below which no effect can be detected. In simple terms, below
this level, there is no detectable effect on health and quality of life due to the
noise.
• LOAEL – Lowest Observed Adverse Effect Level
o This is the level above which adverse effects on health and quality of life can
be detected.
• SOAEL – Significant Observed Adverse Effect Level
22075: 258-262 Romford Road, Forest Gate, London, E7 9HZ Page 6 of 13
Noise Impact Assessment22075.NIA.01 Rev.A 09 March 2021
o This is the level above which significant adverse effects on health and quality
of life occur.
As stated in The Noise Policy Statement England (NPSE), it is not currently possible to have a
single objective based measure that defines SOAEL that is applicable to all sources of noise in
all situations. Specific noise levels are not stated within the guidance for this reason, and allow
flexibility in the policy until further guidance is available.
4.2 The London Plan: Policy D12 Agent of Change
The London Plan states the following with regards to existing noise generating sources and
new residential developments:
A. The Agent of Change principle places the responsibility for mitigating impacts from
existing noise-generating activities or uses on the proposed new noise-sensitive
development.
B. Boroughs should ensure that planning decisions reflect the Agent of Change principle
and take account of existing noise-generating uses in a sensitive manner when new
development, particularly residential, is proposed nearby.
C. Development proposals should manage noise and other potential nuisances by:
• Ensuring good acoustic design to mitigate and minimise existing and potential
impacts of noise generated by existing uses located in the area
• Exploring mitigation measures early in the design stage, with necessary and
appropriate provisions secured through planning obligations
• Separating new noise-sensitive development where possible from existing noise-
generating businesses through distance, screening, internal layout, sound-
proofing and insulation, and other acoustic design measures.
D. Development should be designed to ensure that established noise-generating venues
remain viable and can continue or grow without unreasonable restrictions being
placed on them.
E. New noise-generating development, such as industrial uses, music venues, pubs, rail
infrastructure, schools and sporting venues proposed close to residential and other
noise-sensitive development should put in place measures such as soundproofing to
mitigate and manage any noise impacts for neighbouring residents and businesses.
22075: 258-262 Romford Road, Forest Gate, London, E7 9HZ Page 7 of 13
Noise Impact Assessment22075.NIA.01 Rev.A 09 March 2021
F. Boroughs should refuse development proposals that have not clearly demonstrated
how noise impacts will be mitigated and managed.’
4.3 ProPG: Planning and Noise
As outlined above, the National Planning Policy Framework encourages improved standards
of design, although it provides no specific noise levels which should be achieved on site for
varying standards of acoustic acceptability, or a prescriptive method for the assessment of
noise.
ProPG: Planning and Noise was published in May 2017 in order to encourage better acoustic
design for new residential schemes in order to protect future residents from the harmful
effects of noise. This guidance can be seen as the missing link between the current NPPF and
its predecessor, PPG24 (Planning Policy Guidance 24: Planning and Noise), which provided a
prescriptive method for assessing sites for residential development, but without the nuance
of ‘good acoustic design’ as outlined in ProPG.
ProPG allows the assessor to take a holistic approach to consider the site’s suitability, taking
into consideration numerous design factors which previously may not have been considered
alongside the noise level measured on site, for example the orientation of the building in
relation to the main source of noise incident upon it.
It should be noted this document is not an official government code of practice, and neither
replaces nor provides an authoritative interpretation of the law or government policy, and
therefore should be seen as a good practice document only.
4.4 BS8233:2014
BS8233:2014 ‘Sound insulation and noise reduction for buildings’ describes recommended
internal noise levels for residential spaces. These levels are shown in Table 4.1.
Activity Location 07:00 to 23:00 23:00 to 07:00
Resting Living Rooms 35 dB(A) -
Dining Dining Room/area 40 dB(A) -
Sleeping (daytime resting) Bedrooms 35 dB(A) 30 dB(A)
Table 4.1 BS8233 recommended internal background noise levels
It should be noted that the recommended internal noise levels outlined above are not
applicable under “purge ventilation” conditions as defined by Approved Document F of the
Building Regulations, as this should only occur occasionally (E.G. to remove odour from
22075: 258-262 Romford Road, Forest Gate, London, E7 9HZ Page 8 of 13
Noise Impact Assessment22075.NIA.01 Rev.A 09 March 2021
painting or burnt food). However, the levels above should be achieved whilst providing
sufficient background ventilation, either via passive or mechanical methods.
The external building fabric would need to be carefully designed to achieve these
recommended internal levels.
4.5 WHO Guidelines for Community Noise (1999)
WHO Guidelines for Community Noise (1999) recommends that internal noise levels for
individual events should not exceed 45dB LAmax more than 10-15 times per night.
It should be noted that this impact is increasingly being regarded as ‘LOAEL’ for this number
of exceedances, as described in Section 4.1.
The external building fabric would need to be carefully designed to ensure that the above
guidance is achieved.
5.0 COMMERCIAL NOISE IMPACT DISCUSSION
In addition to the assessment guidance given in the sections above, it is understood that
“impacts of noise from commercial premises on the intended occupiers of the development”
should be evaluated.
As discussed in Section 2.2, the most prominent source of commercial noise at the
development is the industrial bakery to the south, compared with which all other noise
sources were observed to be insignificant at the rear property façade.
Typically, commercial noise would be assessed following the methodology provided by
BS4142: 2014: ‘Methods for rating and assessing industrial and commercial sound’, whereby
the specific level of the commercial noise source at the nearest residential receiver is
compared with the representative background noise level at this receiver location. However,
it can be seen by examining 22075.TH2 that the background noise profile at the rear of the
proposed redevelopment is entirely dominated by consistent and unvarying noise emissions
from the bakery, rendering it impossible to compare bakery noise emissions with the
background noise level at the property in this scenario. This is supported by the fact that the
LAeq levels obtained from manual noise measurements taken in the rear property car park are
within 1dB of the average level measured during the automated survey.
Additionally, it is not possible to isolate the impact of commercial noise on rooms overlooking
the front façade, as the noise profile observed here is a combination of noise emanating from
22075: 258-262 Romford Road, Forest Gate, London, E7 9HZ Page 9 of 13
Noise Impact Assessment22075.NIA.01 Rev.A 09 March 2021
Romford Road and multiple minor, ever-changing sources which could not be evaluated
individually.
Consequently, it has been concluded that the most robust and reliable method of ensuring
that the amenity of future residents is protected from commercial noise emissions, would be
to install glazing and an external building fabric that provides acoustic attenuation sufficient
to achieve internal noise levels commensurate to the recommendations of BS8233 and the
WHO guidelines. The necessary external building fabric and glazing specification to achieve
these recommended levels is specified in Section 6.0 below.
6.0 EXTERNAL BUILDING FABRIC SPECIFICATION
As can be seen by comparing the values in Table 3.1 and Table 4.1, internal noise levels within
the property currently exceed the BS8233 guidelines for internal background noise levels.
Consequently, sound reduction performance calculations have been undertaken in order to
specify the minimum performance required from glazed and non-glazed elements to protect
future residents from commercial noise sources and to achieve the recommended internal
noise levels shown in Table 4.1 within rooms on all facades of the proposed development. The
average and maximum noise levels monitored during the environmental noise survey have
been taken into account.
As a more robust assessment, LAmax spectrum values of night-time peaks have also been
considered and incorporated into the glazing calculation in order to cater for the interior limit
of 45 dB LAmax for individual events, as recommended in WHO Guidelines.
Please note that the glazed and non-glazed element calculations would need to be finalised
once all design proposals are finalised.
6.1 Non-Glazed Elements
At this project stage, the exact construction of the non-glazed external building fabric is
unknown, however, it is understood that no changes are proposed to the existing external
building fabric, which would be based upon the construction proposed in Table 5.1 and would
be expected to provide the minimum figures shown above when tested in accordance with BS
EN ISO, 140-3:1995.
22075: 258-262 Romford Road, Forest Gate, London, E7 9HZ Page 10 of 13
Noise Impact Assessment22075.NIA.01 Rev.A 09 March 2021
Octave band centre frequency SRI, dB
Element
125Hz 250Hz 500Hz 1kHz 2kHz 4kHz
Metsec with Brickslip Outer Wall 27 38 45 49 50 50
Table 6.1 Assumed sound reduction performance for non-glazed elements
6.2 Glazed Elements
Minimum octave band sound reduction index (SRI) values required for all glazed elements to
be installed are shown in Table 5.2. It is understood that no changes to the external building
fabric are permitted, and as such the performances specified in Table 5.2 would be expected
to be achieved by installation of secondary glazing. The performance is specified for the whole
window unit, including the frame and other design features such as the inclusion of trickle
vents. Sole glass performance data would not demonstrate compliance with this specification.
Glazing performance calculations have been based both on average measured night-time
noise levels as well as verified against the LAmax spectrum of individual events in order to
comply with a maximum internal noise level of 45dB(A) in bedrooms as recommended by
World Health Organisation Guidelines. The combined most robust results of these calculations
are shown in Table 5.2.
Octave band centre frequency SRI, dB
Rw (C;Ctr),
Elevation
dB
125Hz 250Hz 500Hz 1kHz 2kHz 4kHz
North Elevations 31 37 40 44 39 47 43 (-1;-3)
South Elevations 27 33 39 42 37 45 39 (-1;-4)
Table 6.2 Required glazing performance
The nominated glazing supplier should verify that their proposed window system meets the
attenuation figures shown at each centre frequency band as shown in Table 5.2.
Example secondary glazing specifications that would be expected to achieve the above
spectral values are shown in Table 5.3.
22075: 258-262 Romford Road, Forest Gate, London, E7 9HZ Page 11 of 13
Noise Impact Assessment22075.NIA.01 Rev.A 09 March 2021
Example glazing type
Elevation
Primary Glazing Secondary
Glazing System Cavity Width
Specification Glazing Thickness
North Existing glazing
Sliding System 150mm 6mm
Elevations installation
East Existing glazing
Sliding System 100mm 6mm
Elevations installation
Table 6.3 Example glazing types
All major building elements should be tested in accordance with BS EN ISO 140-3:1995.
Independent testing at a UKAS accredited laboratory will be required in order to confirm the
performance of the chosen system for an ‘actual’ configuration.
7.0 VENTILATION STRATEGY
Based on the noise levels measured on site, appropriate ventilation systems are outlined in
Table 6.1 below in order to ensure the internal noise environment is not compromised.
Ventilation
Whole Dwelling Ventilation Extract Ventilation
System
Trickle vents providing a minimum
ADF System 1 Intermittent extract fans
performance of 42dB D,n,e,w
Continuous mechanical extract (low
Continuous mechanical extract (high
rate) and trickle vents for supply
ADF System 3 rate) with trickle vents providing inlet
providing a minimum performance of
air
42dB D,n,e,w
Continuous mechanical supply and Continuous mechanical supply and
ADF System 4
extract (low rate) extract (high rate)
Table 7.1 Ventilation systems
In the case of mechanical ventilation, systems should be designed to meet the internal noise
levels as defined in CIBSE Guide A (2015), as shown in Table 6.2.
Room Type LAeq, dB NR
Bedrooms 30 25
Living Rooms 35 30
Kitchen 45-50 40-45
Table 7.2 CIBSE Guide A 2015 guidance levels for mechanical building services
22075: 258-262 Romford Road, Forest Gate, London, E7 9HZ Page 12 of 13
Noise Impact Assessment22075.NIA.01 Rev.A 09 March 2021
In all cases, purge ventilation would be provided by openable windows. As outlined in Section
4.3, the internal noise level requirement would not be applicable during purge conditions as
this would only occur occasionally.
8.0 CONCLUSION
An environmental noise survey has been undertaken at 258-262 Romford Road, Forest Gate,
London, E7 9HZ allowing the assessment of daytime and night-time levels likely to be
experienced by the proposed redevelopment.
Measured noise levels allowed a robust secondary glazing specification to be proposed which
would provide internal noise levels for all residential environments of the development
commensurate to the design range of BS8233.
No further mitigation measures should be required in order to protect the proposed habitable
spaces from external noise intrusion.
22075: 258-262 Romford Road, Forest Gate, London, E7 9HZ Page 13 of 13
Noise Impact AssessmentFront Façade External - 258-262 Romford Road
Environmental Noise Time History
From 26 January 2021 To 27 January 2021
110
100
90
80
70
Level (dB re 2x10-5 Pa)
LAMax
LAeq
60 LA10
LA90
50
40
30
20
10
0
Time
Figure 22075.TH1Rear Façade External - 258-262 Romford Road
Environmental Noise Time History
From 26 January 2021 To 27 January 2021
110
100
90
80
70
Level (dB re 2x10-5 Pa)
LAMax
LAeq
60 LA10
LA90
50
40
30
20
10
0
Time
Figure 22075.TH2Internal Front Façade - 258 - 262 Romford Road
Environmental Noise Time History
From 26 January 2021 To 27 January 2021
110
100
90
80
70
Level (dB re 2x10-5 Pa)
LAMax
LAeq
60 LA10
LA90
50
40
30
20
10
0
Time
Figure 22075.TH3Internal Rear Façade - 258-262 Romford Road
Environmental Noise Time History
From 26 January 2021 To 27 January 2021
110
100
90
80
70
Level (dB re 2x10-5 Pa)
LAMax
LAeq
60 LA10
LA90
50
40
30
20
10
0
Time
Figure 22075.TH4You can also read
