The Black Horse Festival Noise Impact Assessment TECHNICAL

Transcription

The Black Horse Festival
Pestalozzi International Village, Sedlescombe
Noise Impact Assessment
TECHNICAL REPORT
The Black Horse Festival
Pestalozzi International Village, Sedlescombe
Noise Impact Assessment
Table of Contents
1
INTRODUCTION ............................................................................................................................... 1
2
PROPOSED SITE ............................................................................................................................... 2
3
NOISE CRITERIA ............................................................................................................................... 3
World Health Organisation – Night Noise Guidelines for Europe (2009) .................................... 3
World Health Organisation – Guidelines for Community Noise (1999) ....................................... 4
BS8233:1999 Sound insulation and noise reduction for buildings – Code of practice ............... 4
4
NOISE SURVEY ................................................................................................................................. 5
5
DISCUSSIONS ................................................................................................................................... 7
Suggestion of sensible and usable license limits ............................................................................ 8
6
PROPOSED NOISE ACTION PLAN ..................................................................................................... 9
Event noise level monitoring on site during licensable hours..................................................... 10
Public areas noise level monitoring on site outside licensable hours ........................................ 10
Off site noise level monitoring ....................................................................................................... 11
7
CONCLUSIONS ............................................................................................................................... 12
Appendix A:
Glossary of Acoustic Terms .............................................................................................. I
Appendix B:
Sound System Specification ........................................................................................... III
Appendix C:
Main Stage Layout.......................................................................................................... IV
Appendix D:
Noise Measurement Locations ....................................................................................... V
Appendix E:
Estimated Noise Contours.............................................................................................. VI
Appendix F:
Statement of Competence ............................................................................................ VII
JOB NO: 8420
ORIGINATED:
CHECKED:
PASSED:
DOC REF:
VAT No. 844 9267 90
INITIALS:
SS
MP
MP
DATE:
February 10
February 10
February 10
8420 R1
Reg No. 5651834 - Registered Address 82 East Hill, Colchester CO1 2QW
www.soundsolutionconsultants.co.uk
INTRODUCTION
1 INTRODUCTION
1.1 Sound Solution consultants Ltd were commissioned by Pestalozzi International Village Trust to
undertake a noise impact assessment at their estate in Sedlescombe; to quantify propagation
characteristics of entertainment noise from a proposed festival site.
1.2 A noise propagation study has been requested by Rother District Council to aid the license
application 09/01027/LAPRE for the Black Horse Festival to be held at the Pestalozzi
International Village from 28/05/2010 to 31/05/2010.
“The application is for Films (Indoors/Outdoors), Live music (Indoors/Outdoors), Recorded Music
(Indoors), Performances of Dance (Indoors/Outdoors), Provision of facilities for making music
(Indoors) and dancing (All indoors and outdoors) Friday 28/05/10 19:00-23:59, Saturday
29/05/10 to Monday 31/05/10 11:30-23:59 each day.”
1.3 The General Licensing Panel response for the premises licence, dated 8th February 2010, states in
Section 7 that:
“The Senior Environmental Health Officer in the Environmental Protection Team does not believe
the control of noise is adequately dealt with within the event plan provided...”
“The Senior Environmental Health Officer in the Health and Safety Team also does not believe the
event plan provided is sufficient to enable the authority to fully consider the measures proposed
to protect public safety.”
“The neighbours making representation are concerned with noise from loud music and patrons
along with crime and disorder and public safety from increased traffic.”
1.4 The objective of this study is to provide objective noise level data by carrying out a noise
assessment using simulated noise from a stage representative of the actual event held on the
Pestalozzi International Village site. Resultant noise contours will be approximated to establish
the likelihood of annoyance or complaint from neighbouring properties.
1.5 A noise action plan is also suggested within this document to present a noise control structure
for the active monitoring and control of all noise sources; based on similar schemes used at
open-air music festivals.
Sound Solution Consultants Ltd
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PROPOSED SITE
2 PROPOSED SITE
2.1 The Black Horse Festival is intended to operate over a 4-day weekend period and serve up to
1750 guests on the Pestalozzi International Village site in Sedlescombe. Live and recorded music
is proposed to be generated from a main stage PA system situated in a marquee with a small
form acoustic stage in alternating operation for the duration of the event. Recorded music is
only intended to be played as interval music at a low level.
2.2 The following operational hours are understood to be representative for main and acoustic
stages over the entire duration of the festival:

Friday 28th May 2010
19:00 to 23:59

Saturday 29th May 2010
11:00 to 23:59

Sunday 30th May 2010
11:00 to 23:59

Monday 31st May 2010
11:00 to 20:00
2.3 The following tasks have been undertaken in this assessment:

Estimation of representative noise levels reproduced by the main stage PA system during
an event.

Measurement of propagation characteristics of simulated entertainment noise from the
main stage PA system during an event; at critical topographic locations about the
proposed festival site.

Documentation of reference entertainment noise levels about the site.

Creation of a noise contour map and approximate exposure categories that can be
expected in the surrounding community.

Documentation of noise exposure categories relevant to existing standards and guidance
that exist relevant to adverse health effects such as sleep disturbance and annoyance.

Estimation of noise level limits to be used by the festival to protect the majority of
surrounding residences during an event.

Proposal of an active monitoring and noise control plan to protect the public from
widespread nuisance and aid initial concerns put forward by Rother District Council
Environmental Health Officers.
2.4 A glossary of acoustic terms is shown in Appendix A.
2.5 The main stage festival PA system is detailed in Appendix B.
2.6 The festival marquee layout is detailed in Appendix C.
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NOISE CRITERIA
3 NOISE CRITERIA
World Health Organisation – Night Noise Guidelines for Europe (2009)
3.1 The WHO night noise guidelines are based on research into epidemiological and experimental
studies, where the relationship between night noise exposure and health effects can be
summarised as below:
Average night noise level
over a year Lnight,outside
Up to 30 dB
30 to 40 dB
40 to 55 dB
Above 55 dB
Health effects observed in the population
Although individual sensitivities and circumstances may differ, it
appears that up to this level no substantial biological effects are
observed. Lnight,outside of 30 dB is equivalent to the no observed
effect level (NOEL) for night noise.
A number of effects on sleep are observed from this range: body
movements, awakening, self-reported sleep disturbance, arousals.
The intensity of the effect depends on the nature of the source and
the number of events. Vulnerable groups (for example children, the
chronically ill and the elderly) are more susceptible. However, even
in the worst cases the effects seem modest. Lnight,outside of 40 dB is
equivalent to the lowest observed adverse effect level (LOAEL) for
night noise.
Adverse health effects are observed among the exposed
population. Many people have to adapt their lives to cope with the
noise at night. Vulnerable groups are more severely affected.
The situation is considered increasingly dangerous for public health.
Adverse health effects occur frequently, a sizeable proportion of
the population is highly annoyed and sleep-disturbed. There is
evidence that the risk of cardiovascular disease increases.
Table 1 – Summary of night noise levels from the WHO.
3.2 Based on the exposure-effects relationship summarised above, the following night noise
guideline value is recommended for the protection of public health from night noise.
Average night noise level over
Recommended night noise
a year Lnight,outside
guidelines for europe
40 dB
Night noise guideline (NNG)
55 dB
Interim target (IT)
Table 2 – Target night noise level guidelines from the WHO.
3.3 The night noise guidelines state that:
“For the primary prevention of subclinical adverse health effects related to night noise in the
population, it is recommended that the population should not be exposed to night noise levels
greater than 40 dB of Lnight,outside during the part of the night when most people are in bed. The
LOAEL of night noise, 40 dB Lnight,outside, can be considered a health-based limit value of the night
noise guidelines (NNG) necessary to protect the public, including most of the vulnerable groups
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NOISE CRITERIA
such as children, the chronically ill and the elderly, from the adverse health effects of night
noise.”
“An interim target (IT) of 55 dB Lnight,outside is recommended in the situations where the
achievement of NNG is not feasible in the short run for various reasons. It should be emphasized
that IT is not a health-based limit value by itself. Vulnerable groups cannot be protected at this
level. Therefore, IT should be considered only as a feasibility-based intermediate target which can
be temporarily considered by policy-makers for exceptional local situations.”
World Health Organisation – Guidelines for Community Noise (1999)
3.4 With reference to the World Health Organisation guidelines for community noise:
“It should be noted that it should be possible to sleep with a bedroom window slightly open (a
reduction from outside to inside of 15 dB). To prevent sleep disturbances, one should thus
consider the equivalent sound pressure level and the number and level of sound events.
Mitigation targeted to the first part of the night is believed to be effective for the ability to fall
asleep.”
3.5 In addition to the above:
“The capacity of a noise to induce annoyance depends upon its physical characteristics, including
the sound pressure level, spectral characteristics and variations of these properties with time.
During daytime, few people are highly annoyed at LAeq levels below 55 dB(A), and few are
moderately annoyed at LAeq levels below 50 dB(A). Sound levels during the evening and night
should be 5–10 dB lower than during the day.”
BS8233:1999 Sound insulation and noise reduction for buildings – Code of
practice
3.6 The British Standard BS8233:1999 Sound Insulation and Noise Reduction for Buildings – Code of
Practice recommends design criteria for internal noise levels within residential properties. This
standard suggests criteria, such as reasonable resting/sleeping conditions and proposes noise
limits that will normally satisfy these criteria for most people.
Design range LAeq,T dB
Good
Reasonable
Bedrooms
30
35
Reasonable resting/sleeping
conditions
Living Rooms
30
40
Table 3 – Summary of Recommended Guidance from BS 8233:1999.
Criterion
Typical situations
3.7 With respect to design criteria and limits for intrusive external noise, BS8233 also states:
“In gardens ..it is desirable that the steady noise level does not exceed 50LAeq,T dB and 55LAeq,T dB
should be regarded as the upper limit.”
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NOISE SURVEY
4 NOISE SURVEY
4.1 A noise survey was undertaken during afternoon of Tuesday 23rd February 2010. Eleven
measurement locations were selected to directly assess levels of entertainment noise
propagating towards residential dwellings in the vicinity of the proposed Black Horse Music
Festival site. The following measurement positions were determined:
Reference
A
B
C
D
E
F
G
H
I
J
K
Measurement Description
Ashdown Cottage entrance gate
South-east boundary of Pestalozzi village at entrance gate
New England Lane – north T-junction
On hill south boundary of Manor House
North boundary of Pestalozzi Village estate in line with East view Terrace
North-west boundary of Pestalozzi Village estate & in line with Sedlescombe village
Top of hill outside garden of objecting residence ref. 22
Festival car park exit
Rear of Sedlescombe Primary School & in line with Sedlescombe village
Near East View Terrace
Public footpath to the rear of Gorselands
Table 4 – Reference noise measurement locations.
4.2 The equipment used during the survey consisted of the following Type 1 precision noise
monitoring equipment listed below. All equipment listed has traceable calibration history to
relevant British Standards as performed by a UKAS accredited body:
Manufacturer
Larson Davis
Larson Davis
Larson Davis
CEL
Model
No.
824
902
2541
284/2
Description
Serial No.
3rd Octave Band Sound Level Meter
2897
Microphone pre-amplifier
1837
½” Condenser microphone
7778
Acoustic calibrator (re. 114dB @1kHz) 3/08819670
Table 5 – Noise monitoring equipment
Calibration
Expiry Date
02/10
02/10
02/10
02/10
4.3 The equipments calibration was checked before and after noise measurements were taken using
a 1kHz reference tone at 114dB to ensure that the instrument operated within acceptable
tolerances for drift and level.
4.4 The weather at the start of the noise survey was overcast with light rain and a very light breeze;
estimated to be less than 5mph. Good measurement conditions were reported throughout the
survey such that the weather conditions did not have any adverse affects on the noise levels
monitored.
4.5 All noise measurements were taken at a height of 1.2-1.5m from the ground in an open area
using a tripod, away from significant facades and objects that would adversely affect the data
measured.
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NOISE SURVEY
4.6 To simulate representative levels of entertainment noise from the proposed Black Horse Music
Festival site; Warehouse Light & Sound provided one half of the main stage PA system. It was
situated in the exact topographical position relevant to the main stage for the entire
propagation test. The full sound system equipment for the event is listed in Appendix B.
4.7 Reference noise levels suitably high enough for an open-air festival were determined and by
Warehouse Light & Sound Front-of-House engineers using a CD of folk music. A continuous
equivalent noise level of 95dB LAeq, 1min was measured at the mix position.
4.8 A pink noise signal (20Hz – 20kHz) was subsequently generated through the main stage PA
system using an NTI Minirator. This level of pink noise was set to match that of a prospective
event at 95dB(A).
Pink noise is a reference signal whereby all acoustic energy is distributed uniformly by octave
throughout the audio spectrum; making the total sound power in each octave equal. Pink noise
is commonly used for propagation tests given the even distribution of energy across the entire
audible range.
4.9 Environmental noise levels were sampled as equivalent LAeq, 1min in the presence of pink noise
generated from the festival site for each location in Table 4. All noise measurements were
corrected for equivalent LA90, 1min background noise levels taken without the noise source in
operation and estimated to the nearest whole decibel.
4.10 The level of pink noise was verified at the mix position at the end of the survey to ensure
that the source noise level had not altered from 95dB(A).
4.11
The topographical layout of all measured noise levels is shown in Appendix D.
4.12 The following subjective descriptors have been made in an attempt to describe the
subjective level of noise noted at each location during the daytime noise survey:
Reference
A
B
C
D
E
F
G
H
I
J
K
Noise Level
Subjective Impression
LAeq, 1min
62
Discernable & substantially above the residual noise level
50
Distinguishable noise notably above the residual noise level
47
Bass frequencies prominent above the residual noise level
50
Distinguishable noise notably above the residual noise level
40
Distant hubbub around the residual noise level
44
Noticeable noise marginally above the residual noise level
43
Noticeable noise marginally above the residual noise level
48
Bass frequencies prominent above the residual noise level
41
40
38
Distant hubbub at or below the residual noise level
Table 6 – Subjective noise measurement descriptions.
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DISCUSSIONS
5 DISCUSSIONS
5.1 Based on relevant noise guidance in Section 3 and noise level data recorded in Section 4; the
following table can be read in addition to the estimated noise contour plot in Appendix E; in an
attempt to predict effect of entertainment noise on the local community:
Noise exposure
category
Noise Level
LAeq, 1min
Predicted effect of noise on the community with reference to
listed Guidance standards explored in Section 3
1
>62
[Not applicable where the entire exposed population is assumed to
be part of the Black Horse Festival]
2
56-62

Adverse health effects occur frequently for the public;
where a sizeable proportion of the population may
become highly annoyed and sleep-disturbed.


3
4
5
6
High daytime annoyance may occur for a few people
Adverse health effects are observed among the exposed
population during the night.
50-56
 Meets WHO interim night noise target
Assuming 15dB reduction through an open window re. WHO:
 Meets BS8233:1999 ‘reasonable’ standard for living rooms
 Moderate day annoyance may occur for a few people
 Adverse health effects are observed among the exposed
population during the night.
44-50
 Meets BS8233:1999 ‘reasonable’ standard for bedrooms
 6-12dB below daytime moderate annoyance guidelines
 Partially satisfies WHO Night noise guideline of 40dB(A)
38-44
 A number of effects on sleep are observed from this range
 Meets BS8233:1999 ‘good’ standard for bedrooms
 Significantly below WHO daytime annoyance guidelines
 Satisfies WHO Night noise guideline of 40dB(A)
<38
 A number of effects on sleep are observed from this range
 Meets BS8233:1999 ‘good’ standard for bedrooms
Table 7 – Assessment of predicted noise levels for each band of exposure.
5.2 It must be considered that long term event noise levels off site may actually equate to LAeq, event
>3dB below those shown in Table 7; understanding that the main stage is only in operation for
50% of the time. This is illustrated in Figure 1 below:
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DISCUSSIONS
8
Main stage
Sound pressure level dB(A) re. 20µPa
100
Trend of
noise
typical
for an
event
90
80
70
Acoustic stage
60
50
40
30
Minimum ambient noise levels
10:00:00
10:30:00
11:00:00
11:30:00
12:00:00
12:30:00
13:00:00
13:30:00
14:00:00
14:30:00
15:00:00
15:30:00
16:00:00
16:30:00
17:00:00
17:30:00
18:00:00
18:30:00
19:00:00
19:30:00
20:00:00
20:30:00
21:00:00
21:30:00
22:00:00
22:30:00
23:00:00
23:30:00
00:00:00
00:30:00
01:00:00
20
Operational Time HH:MM:SS
Figure 1 – Likely LAeq, 30min noise levels at mix positions for Saturday / Sunday.
5.3 Where the acoustic stage may be used at a level 12dB(A) below that of the main stage; the
following consideration should be made with reference to table 7:
Acoustic stage noise exposure category ≈ Main stage noise exposure category +2
5.4 The above suggestion does not take account of directivity and nor apply for the population of
people residing at the festival in noise exposure category 1.
Suggestion of sensible and usable license limits
5.5 The following outline guidance levels are proposed for the main and acoustic stages not to be
exceeded at the mixer position over any given 15-minute period during the entire event. The
noise levels specified are based on the findings of this report:
Monitored event location
Hours of operation
Main stage mixing position
When live during the period of approx
14:00 – 23:00 each day
Acoustic stage mixing position When live during the period of approx
11:30 – 23:59 each day
Table 8 – Suggested usable noise level limitations.
Suggested LAeq, 15min
noise level limit
95
82
5.6 Proposed noise level limits are subject to the consideration of the licensing panel and are
made with consideration of Table 7 and Appendix E. Noise level limits suggested in Table 8
will be adhered to following the proposed noise action plan suggested in the following section.
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PROPOSED NOISE ACTION PLAN
9
6 PROPOSED NOISE ACTION PLAN
6.1 The following management flow chart is proposed for the event:
Complaint of noise nuisance from nearby residential location
Rother District Council
Bernie Martin
Mick Hoad
Allocated event EHO
Warehouse Light & Sound
Black Horse Festival Chairman
Noise monitoring technicians
Resident FoH mixing engineer
OFF SITE
ON SITE
Visiting FoH mixing engineer
FOR NOISE COMPLAINTS FROM THE MAIN STAGES
Required to be in attendance during all performances Friday 18:00 through till Monday 20:00
OTHER NOISE COMPLAINTS INCLUDING
OUT OF HOURS USE OF THE CAMP SITE
Public areas site managers
Required attendance from
Black Horse Festival / Pestalozzi Village
Required to be in attendance during the entire event Friday 18:00 through till Monday 20:00
Figure 2 - Event noise management hierarchy.
6.2 A contact list of all key personnel in the noise management hierarchy will
be made
availablefrom
to
Required
attendance
Rother District Council and shared between each responsible person of the group.
6.3 It is recommended that the event noise control management team consider the use of site-wide
handheld radios for each key personnel. Rapid and direct communication can be made where a
dedicated radio channel is allocated to the group.
6.4 All monitoring technicians will have previous experience in the monitoring of noise levels at a
live event; considered to be competent and trained in the use of a sound level meter.
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Event noise level monitoring on site during licensable hours
6.5 Two main areas for noise level monitoring of main stages will established on-site for the
duration of the event. These are recognised as follows:

Main stage FoH mix-position

Acoustic stage FoH mix position
6.6 Monitoring at the mix position of each stage enables the Black Horse Festival to demonstrate
generated noise levels during any point of the event over the entire licensed period. By having
an active and reliable reading of rolling equivalent continuous LAeq, T noise levels; quantifiable
reductions in noise can be made and demonstrated in the event of widespread nuisance claims.
6.7 All noise levels will be monitored using a minimum IEC 61672 (or equivalent) Class 2 Sound Level
Meter. All SLMs should be able to demonstrate a traceable calibration history no greater than
two years from the period of use; whose validity is checked before and after use using a
handheld acoustic calibrator.
It is acceptable that NTI AL1 Acoustilizers are used at the FoH mixing positions, if preferred. Such
equipment is known to be used at Stadia and outdoor events to monitor noise levels at the
mixing position.
6.8 Noise levels should be monitored and recorded for 1-minute continuous equivalent noise levels
for the entire duration of the event, using the A-weighting level filter and fast (F) time weighting.
It is recommended that where NTI AL1 Acoustilizers are used at the FoH mixing positions; the
complementary NTI Minilink software is used on an accompanying laptop so that the monitored
LAeq, 1min (F) noise levels are clearly available for the FoH engineer to see.
6.9 It is acceptable that only one set of monitoring equipment be used for both mixing positions for
the event where both stages are not used simultaneously.
Public areas noise level monitoring on site outside licensable hours
6.10 It is equally important that the event organiser and site manager(s) ensure that noise
emanating from public areas is controlled beyond the licensable hours for live or recorded
music. These are recognised as follows:

Public camping

Public car parking
6.11 The use of private, portable PA systems and car stereos for group enjoyment in public areas
should be prohibited beyond the licensable hours for live or recorded music.
6.12 It is recommended that the restriction of use of PA systems for group enjoyment is
communicated to all camping festival goers before entry to the site and on entrance to the site.
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This should be communicated through clear and concise signage about the camp site and
included in the Terms and Conditions associated with ‘reasonable use’ of the site.
6.13 Active patrols of the camp site and car park will be made by public area site managers at
regular intervals throughout the duration of the event. A time-based log-book will be kept and
maintained to demonstrate that the site has been checked for prohibited equipment that is
likely to cause noise nuisance off site. This process is considered to be critical beyond the
licensable hours for live or recorded music and throughout the night.
6.14 Where a breach of ‘reasonable use’ is identified with regards to noise, for either the camp
site or car park public areas of the site; the event organiser should confiscate the offending
equipment during the night time. Where repeated breach of ‘reasonable use’ is witnessed and
logged by the site manager; the offending patron(s) should be removed from site.
Off site noise level monitoring
6.15 An engineer will be allocated to patrol and manage discernable reports of noise off site in
the vicinity of Sedlescombe and neighbouring estates; excluding the camping and car parking
areas but with an emphasis on those areas from which noise gave rise to complaints from
previous events. There will be a dedicated off site monitoring technician on duty throughout
licensable hours for live or recorded music of Friday, Saturday, Sunday and Monday.
6.16 Off site engineers will be expected to offer their full assistance to the local authority reduce
off site sound levels using on site control by liaising directly with the FoH sound engineer, as
required. Objectionable measurement and subjective description of event noise should be
attempted at each off site location (and documented) to establish the magnitude of complaint
before any resulting action is taken.
The noise management staff will monitor compliance with the specific noise licence conditions; if
set as a discrete limit across points of the site boundary. Where this information has yet to be
determined, it should be noted that a structure will be in place for active compliance with Rother
District Council noise conditions.
6.17 The target will be to assess any complaint of noise within the combined estates of
Sedlescombe and within 15 minutes of it being received by the noise management team.
Where any complaint is received from outside Sedlescombe the response time shall be within
25 minutes of receipt.
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CONCLUSIONS
7 CONCLUSIONS
7.1 An assessment of noise propagation has been carried over eleven positions representative of the
closest noise sensitive areas to the Black Horse Festival; proposed to be held on the Pestalozzi
International Village site in Sedlescombe. Pink noise was generated at 95dB(A) through the
intended festival PA system to create quantifiable levels of source noise in the surrounding
community.
7.2 Estimated entertainment noise levels have been summarised in Appendix D & E to demonstrate
approximate levels and noise exposure categories that can be expected in the surrounding
community; as a direct result of the Black Horse Festival.
7.3 The subjective community response has been quantified in Table 7 of this report, relevant to
each noise exposure category generally outlined in Appendix E.
7.4 Noise level limits have subsequently been proposed in Table 8 of this report to maintain a high
level of noise at the mix position representative of an outdoor festival and ensure that
community annoyance is low for the vast population in Sedlescombe.
7.5 A noise action plan has been proposed in Section 6 of this assessment to be adopted alongside
the noise level limits proposed in Table 8; to allow for active control of site noise levels in direct
response to adverse comment that may be received during the event.
7.6 With the provisions of suitable noise limits and a noise action plan; this report demonstrates
that noise levels from the proposed Black Horse Festival are likely to be acceptable for the
majority of the population in Sedlescombe. The proposed noise action plan can be used to
investigate and further protect the public where complaint of noise nuisance is received.
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Appendix A:
Appendix A:
Glossary of Acoustic Terms
DEFINITIONS AND UNITS
A1
Noise is defined as unwanted sound. The range of audible sound is from 0dB to 140dB,
which is taken to be the threshold of pain. The sound pressure detected by the human ear
covers an extremely wide range. The decibel (dB) is used to condense this range into a
manageable scale by taking the logarithm of the ratio of the sound pressure and a reference
sound pressure.
A2
The unit of frequency is Hz. 1 Hz is one pressure fluctuation in one second. The frequency
response of the ear is usually taken to be about 16Hz (number of oscillations per second) to
18,000Hz. The ear does not respond equally to different frequencies at the same level. It is
more sensitive in the mid-frequency range than at the lower and higher frequencies, and
because of this, the low and high frequency component of a sound are reduced in
importance by applying a weighting (filtering) circuit to the noise measuring instrument. The
weighting which is most used and which correlates best with the subjective response to
noise is the dB(A) weighting. This electronic filter matches the variation in the frequency
sensitivity of the meter to that of the human ear. This is an internationally accepted
standard for noise measurements.
A3
The ear can just distinguish a difference in loudness between two noise sources when there
is a 3dB(A) difference between them. Also when two sound sources of the same noise level
are combined the resultant level is 3dB(A) higher than the single source. When two sounds
differ by 10dB(A) one is said to be twice as loud as the other.
A4
A few examples of noise of various levels are given below:
Sound Level, dB(A)
Environmental Condition
0 – 10
Threshold of hearing
10 - 20
Broadcasting Studio
20 – 30
Bedroom at night
30 – 40
Library
40 – 50
Living room urban area
50 – 60
Typical Business Offices
60 – 70
Conversation Speech
70 – 80
Average traffic on street corner
80 – 90
Inside a factory
100 – 110
Burglar Alarm (1m away)
110 – 120
Pneumatic drill (1m away)
120 – 130
Jet aircraft take off
130 - 140
Threshold of pain
Table A1 – Example noise levels.
A5
The subjective response to a noise is dependent not only upon the sound pressure level and
its frequency, but also its intermittency. Various statistical indices have been developed to
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I
Appendix A:
try and correlate annoyances with the noise level and its fluctuations in a changing noise
environment. The indices and parameters used in this report are defined below:
A6
LAeq: Equivalent Continuous Sound Pressure Level The A-weighted sound pressure level of a
steady sound that has, over a given period, the same energy as the fluctuating sound under
investigation. It is in effect the energy average level over the specified measurement period
(T) and is the most widely used indicator for environmental noise.
A7
LAN: the A-weighted sound level exceeded for N% of the measurement period. In BS7445 the
LA90 is used to define the background noise level, i.e. the noise that would remain once all
local noise sources were removed. The LA10 gives an indication of the upper limit of
fluctuating noise and is used in the assessment of road traffic noise.
A8
LAMAX: The maximum ‘A’ weighted noise level recorded during the measurement period.
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Appendix B:
Appendix B:
Sound System Specification
Sound System Specification
Warehouse Light and Sound
Unit 3, Acorn Farm, Netherfield, East Sussex, TN33 9QH
Tel 01424 838355 Fax 01424 838356 Mob 07979 664911
Email bernie@wareh.demon.co.uk
Specification
Black Horse Music Festival
Sound System (Main Stage –Full PA)
Transducers




12 of JBL Single Bass speakers
8 of JBL Low mid speakers
8 of JBL High mid horns
8 of JBL High frequency horns
Amplification



2 of Ecler DPA4000T Bass amplifiers
2 of Ecler DPA2500T Low mid amplifiers
4 of Ecler DPA 2000 High mid/Treble amplifiers
Control



2 of Ecler DP400 digital crossover/Limiters
1 of LA Audio dual 30 band graphic equaliser with dynamic processors
1 of Soundcraft Series two 36 channel control desk
Sound System (Acoustic Stage – Vocal PA)
Transducers

2 of JBL active speakers
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Appendix C:
Appendix C:
Main Stage Layout
Main Stage Layout
Figure C1 – Plan layout of The Black Horse Festival main stage and bar areas.
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Appendix D:
Appendix D:
Noise Measurement Locations
Noise Measurement Locations
K
38dBA
J
40dBA
I
41dBA
E
40dBA
F
44dBA
G
D
43dBA
50dBA
B
50dBA
H
48dBA
A
62dBA
C
47dBA
Figure D1 – Plan of Pestalozzi International Village and highlighted noise measurement locations.
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Appendix E:
Appendix E:
Estimated Noise Contours
Estimated Noise Contours
>62dB(A)
56-62dB(A)
50-56dB(A)
44-50dB(A)
38-44dB(A)
Figure E2 – Approximate entertainment noise level contours.
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Appendix F:
Appendix F:
Statement of Competence
Statement of Competence
F1. The author of this document holds the following academic qualifications and professional
memberships relevant to acoustics, audio and noise control:

Batchelor of Science Honours Degree in Acoustics

Institute of Acoustics Diploma in Acoustics and Noise control

Is a professional member of the audio engineering society

Is an associate member of the institute of acoustics
F2. The author can refer to relevant experience in excess of 50 live music events [either in direct
control of, or part management of noise levels] over the past 5 years. Live-sound consultancy
work has been successfully completed for numerous music events covering a sample of major
UK music venues listed in-part below:

Glastonbury Festival

Wembley Stadium

City of Manchester stadium

Hampden Park stadium
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VII

The Black Horse Festival Noise Impact Assessment TECHNICAL

Transcription

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