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Acoustic Report for No. 641-657 King Street, Newtown
Reference No.: 2015-286 Rev1
1
ACOUSTIC NOISE & VIBRATION SOLUTIONS P/L Suite 603, Level 6 Compass Centre Bankstown, NSW 2200 ABN: 37 169 392 456
Phone: 9793 1393 Fax: 9708 3113 Email: [email protected]
Acoustic Report
- Traffic, Aircraft Noise & Rail Noise &
Vibration Assessment -
For proposed development at
No. 641-657 King Street, Newtown
Prepared By: Domeniki Tsagaris (M.I.E.Aust),B.E.(UNSW) Australian Acoustical Society (Sub).
Approved By: Moussa Zaioor (M.I.E. Aust), CPENG, Australian Acoustical Society (Member).
Date: October 26, 2015
Amended Date: October 31, 2016
Reference No.: 2015-286 Rev 1
Acoustic Report for No. 641-657 King Street, Newtown
Reference No.: 2015-286 Rev1
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DOCUMENT CONTROL
Date Revision History Prepared By: Reviewed and
Authorised by:
19/05/2015 Initial Report Domeniki Tsagaris Moussa Zaioor
03/06/2015 Version 1 Domeniki Tsagaris Moussa Zaioor
26/10/2015 Version 2 Domeniki Tsagaris Moussa Zaioor
31/10/2016 Final Report Domeniki Tsagaris Moussa Zaioor
Acoustic Report for No. 641-657 King Street, Newtown
Reference No.: 2015-286 Rev1
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TABLE OF CONTENTS
Contents Page
Document Control .................................................................................................................. 2 Table of Contents ................................................................................................................... 3
1.0 INTRODUCTION ................................................................................................... 4
2.0 PART 1 – TRAFFIC NOISE ................................................................................... 4
2.1 NOISE SURVEY AND INSTRUMENTATION .................................................... 4
2.2 Acoustical Study (AS/NZS 2107:2000)................................................................... 5
2.3 Acoustical Study (AS 3671-1989) & Clause 102 of the State Environmental Planning
Policy – (Infrastructure) 2007 ............................................................................................. 6
2.4 Sleep Arousal ........................................................................................................... 7
3.0 PART 2 - AOUSTIC NOISE AND VIBRATION NEAR RAILWAY LINES ...... 8
3.1 ACOUSTICAL STUDY ............................................................................................... 8
3.2 Australian Standard 2107:2000 & Clause 87 of the SEPP ...................................... 9
3.3 NOISE SURVEY & INSTRUMENTATION ....................................................... 10
3.4 NOISE SURVEY RESULTS ................................................................................ 11
3.5 RAIL VIBRATION SURVEY.................................................................................. 11 4.0 PART 3 - AIRCRAFT NOISE .............................................................................. 12
4.1 ACOUSTICAL STUDY ........................................................................................ 12
5.0 EXTERNAL RECOMMENDATIONS ................................................................. 13
5.1 WINDOWS/SLIDERS, DOORS, EXTERNAL WALLS & ROOF ..................... 13
5.2 CAR PARK MECHANICAL VENTILATION .................................................... 13
5.3 MECHANICAL VENTILATION for RESIDENTIAL UNITS............................ 14
6.0 Discussion and Conclusion .................................................................................... 16
7.0 Appendix ................................................................................................................ 17
Acoustic Report for No. 641-657 King Street, Newtown
Reference No.: 2015-286 Rev1
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1.0 INTRODUCTION
The aim of this report is to determine the building materials to be used and the construction
methods to be adopted such that the proposed development at No. 641-657 King Street,
Newtown is built to achieve acceptable internal noise levels.
Noise intrusion levels are to be within the limits adopted by the Building Code of Australia,
NSW Road Noise Policy, Clause 87 & 102 of the State Environmental Planning Policy –
(Infrastructure) 2007, the Department of Planning’s document titled “Development Near Rail
Corridors and Busy Roads – Interim Guidelines”, AS 3671 ‘Road Traffic Noise Intrusion –
Building Siting and Construction’, AS 2107 ‘Acoustics – Recommended Design Sound
Levels and Reverberation Times’, AS 2021 ‘Acoustics-Aircraft Noise Intrusion –Building
Siting and Construction’ and Marrickville Council Conditions and Requirements; such that
all habitable rooms in the proposed development shall be designed to limit internal noise
levels.
The site is located on the corner of King Street and Goodsell St, Newtown (Figure 1 – Site
Location). It is affected by traffic noise from King Street, railway noise from a rail corridor
located approximately 15 metres north of the site and by aircraft noise from Sydney Airport.
The architectural plans by BKA Architects dated the 17th
October, 2016 are for the proposed
construction of a nine (9) storey mixed use development including two (2) levels of basement
parking areas.
2.0 PART 1 – TRAFFIC NOISE
2.1 NOISE SURVEY AND INSTRUMENTATION
On May 25th
, 2015, Acoustic Noise & Vibration Solutions went to the above address to carry
out acoustic measurements near the front proposed building line facing King Street (Figure 2
– Point A - Noise Reading Location). The unattended environment noise monitoring was
conducted for seven (7) days between Monday 25th
May, 2015 and Monday 1st June, 2015.
All sound pressure levels are rounded to the nearest whole decibel. All measurements were
taken in accordance with the Australian Standards AS 1055 “Acoustics- Description and
Measurements of Environmental Noise”.
The noise survey was conducted to determine a conservative reading of the existing day and
evening noise levels [15hrs- 7:00 -22:00] L(A90, 15 minutes [1hr]) and L(Aeq, 15 minutes [1 hr]) and to
determine a conservative reading of existing night and early morning noise levels [9hrs-
22:00-7:00] L(A90, 15 minutes [1hr]) and L(Aeq, 15 minutes [1 hr]).
The measurement procedure and the equipment used for the noise survey are described
below. All sound pressure levels are rounded to the nearest whole decibel. All sound level
measurements and analysis carried throughout this report are carried with Svantek 957 Noise
and vibration level meter which has the following features:
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Type 1 sound level measurements meeting IEC 61672:2002
General vibration measurements (acceleration, velocity and displacement) and HVM
meeting ISO 8041:2005 standard
Three parallel independent profiles
1/1 and 1/3 octave real time analysis
Acoustic dose meter function
FFT real time analysis (1920 lines in up to 22.4 kHz band)
Reverberation Time measurements (RT 60)
Advanced Data Logger including spectra logging
USB Memory Stick providing almost unlimited logging capacity
Time domain signal recording
Advanced trigger and alarm functions
USB 1.1 Host & Client interfaces (real time PC “front end” application supported)
RS 232 and IrDA interfaces
Modbus protocol
Machine was calibrated prior to reading, and there was light wind and rain during the
acoustic reading period. The Full Average Statistical Noise Parameters including L(Aeq, 15
minutes) & L(A90, 15 minutes) are presented in Figure 4 – Noise Survey. A Summary of those
readings is presented in the table below:
Table 2.1- Summary of Noise Readings Monday 25
th May – 1
st June, 2015
At Point A L(Aeq, 15 minutes) L(A90, 15 minutes)
Day & Evening Time – 7:00am-
10:00pm 72 dB(A) 58 dB(A)
Night & Early Morning Time –
10:00pm-7:00am 67 dB(A) 52 dB(A)
2.2 Acoustical Study (AS/NZS 2107:2000)
The above standard has formulated the criteria for developments situated in urban areas. The
levels have been derived from relevant Australian Standards, the measurements and analysis
of noise conditions in other similar developments and standards established in completed
projects.
As traffic noise levels are not constant, a Leq noise level descriptor is used when assessing
this type of noise source. The Leq is the mean energy level of noise being measured and has
been found to accurately describe the level of annoyance caused by traffic noise.
It is usual practice, when we find it necessary to recommend internal sound levels in
buildings to refer to Australian/New Zealand Standard AS/NZS 2107:2000 “Acoustics –
Recommended Design Sound Levels and Reverberations times for Building Interiors”.
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This standard provides recommended noise levels for steady state such as noise from building
services and quasi-steady state sounds, such as traffic and industrial noise. The noise levels
recommended in AS/NZS 2107:2000 take into account the function of the area and apply to
the sound level measured within the space unoccupied although ready for occupancy. The
standard recommends the following noise levels for residential buildings.
AUSTRALIAN STANDARD AS/NZS 2107:2000 RECOMMENDED DESIGN NOISE LEVELS, LAeq
Type of occupancy Recommended Design Sound Level
Activity Satisfactory Maximum
Houses in areas with negligible transportation
Sleeping Areas 25 35
Houses and Apartments near minor roads
Living Areas 30 40
Sleeping Areas 30 35
Work Areas 35 40
Apartment common areas (e.g. foyer, lift lobby) 45 55
Houses and Apartments near major roads
Living Areas 35 45
Sleeping Areas 30 40
Work Areas 35 45
Apartment common areas (e.g. foyer, lift lobby) 45 55
2.3 Acoustical Study (AS 3671-1989) & Clause 102 of the State Environmental
Planning Policy – (Infrastructure) 2007
Australian Standard 3671 “Traffic noise intrusion building siting and construction” is used to
determine the type of building materials required to satisfactorily attenuate traffic noise so
that internal traffic noise levels recommended in Australian Standard 2107-2000
“Recommended design sound levels and reverberations for building interiors” and Clause
102 of the State Environmental Planning Policy – (Infrastructure) 2007, can be achieved.
By taking in to consideration that the proposed development is considered to be “sensitive to
traffic noise or vehicle emissions”, it must be “appropriately located and designed, or include
measures, to ameliorate potential traffic noise or vehicle emissions within the site of the
development” arising from King Street.
Under Clause 102, where the development is for residential use and is located in or adjacent
to a relevant road corridor, a consent authority must not grant consent unless it is satisfied
that appropriate measures will be taken to ensure that the following LAeq levels are not
exceeded:
- in any bedroom in the building – 35dB(A) at any time between 10.00p.m. and 7.00a.m.
- anywhere else in the building (other than a garage, kitchen, bathroom or hallway) –
40dB(A) at any time.
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Maximum design sound level is defined as the level of noise that has been found to be
acceptable by most people for the environment in question and also to be not intrusive. In this
assessment, satisfactory design sound levels were used where practically possible.
In accordance with Section 3.4.2.6 of AS 3671 the traffic noise attenuation (TNAc) required
for each building component (walls, windows, ceiling,…etc) is determined from the
following equation:
TNAc = TNR + 10 log 10 [ ( Sc / Sf )x (3/h) x 2T60 x C ] ………….…………..4.1
Where TNAc = the traffic noise attenuation required of the component, in decibels.
TNR = the traffic noise reduction, determined in Clause 3.3;
Sc/Sf = area ratio of the component
h = ceiling height of room, in metres
T60 = reverberation time of room, in seconds
C = number of components.
The tables provided in the relative Australian standards for selecting building materials
(walls, windows, ceiling etc) are expressed in terms of their Rw (weighted sound reduction
index) or STC. Section 3.4.3.1 defines the relation between Rw and TNAc calculated in [4.1]
as follows:
Rw (or STC) ≈TNAc + 6 ……………………………………………………..….4.2
This formula approximate all allowances made for the spectral composition of the noise.
2.4 Sleep Arousal
Section 5.4 of the NSW Road Noise Policy mentions the Environment Protection Authority
NSW 1999 guideline which aims at limiting the level of sleep disturbance due to
environmental noise. It states that the LA1, 1 minute level of any noise should not exceed the
ambient LAF90 noise level by more than 15dB. This guideline takes into account the
emergence of noise events, but does not directly limit the number of such events or their
highest level, which are also found to affect sleep disturbance.
Applying the above thus the sleep disturbance criteria for the above project is LA1, 1 minute and
should not be exceeded by [ LA90 =52 dB(A) plus 15 ]= 67 dB(A).
There are other studies on sleep disturbance like the one carried the enHealth Council (2004)
and the guidelines published by the World Health Organisation (1999) were reviewed and
analysed in terms of the guidance on noise exposure and sleep disturbance. The enHealth
report states that:
‘ as a rule for planning for short-term or transient noise events, for good sleep over 8 hours
the indoor sound pressure level measured as a maximum instantaneous value not exceed
approximately 45 dB(A) LA,(Max) more than 10 or 15 times per night’.
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3.0 PART 2 - AOUSTIC NOISE AND VIBRATION NEAR RAILWAY LINES
3.1 ACOUSTICAL STUDY
The proposed development is to comply with the Department of Planning’s document titled
“Development Near Rail Corridors and Busy Roads – Interim Guidelines” as it is located
approximately 15 metres north of a railway corridor.
The noise criteria for residential buildings in Table 2.1 for both road and rail are specified in
the Infrastructure SEPP. Other values in Table 3.1 are based on the Environmental Criteria
for Road and Traffic Noise (EPA1999).
Table 3.1 - Noise Criteria
Residential Buildings
Type of occupancy
Noise Level
dBA
Applicable time
period
Sleeping areas (bedroom) 35
Night 10 pm to 7
am
Other habitable rooms (excl. garages,
kitchens, bathrooms & hallways) 40 At any time
Section 3.6.2 – Ground-borne Noise of the above mentioned standard states that residential
buildings should be designed such that the 95th
percentile of train pass-bys complies with the
rail noise criterion for day and night time periods as below.
Daytime period indoor rail noise levels for sleeping and living areas is an LAmax limit
of 40dB(A).
Night time period indoor noise levels for living and sleeping areas is an LAmax limit
35dB(A).
Ground borne noise is calculated as LAmax (slow) which refers to the maximum noise level
not exceeded for 95% of rail pass-by events and is measured using the ‘slow’ response setting
on a sound-level meter.
Ground-borne noise from rail operations can be generated when ground-borne vibration
produced by a rail vehicle pass-by is re-radiated as noise inside a building by the building
structure. The causes of ground-borne noise from rail operations are therefore the same as
those of ground-borne vibration.
In our situation ground-borne noise is not normally noticeable as it is at a much lower level
than the level of air-borne noise from rail pass-bys. Ground-borne noise may cause
annoyance when there is no significant air-borne noise affecting a residence, such as where
noise sensitive receivers are located above underground railways or in a mixed-use building
integrating rail infrastructure.
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In addition floor vibration levels in habitable rooms should comply with the criteria in British
standard BS6472-1:2008 Evaluation of Human Exposure to Vibration in Buildings (1Hz to
80 Hz).
Further, when windows and doors are left open, indoor sound levels should not exceed the
nominated noise criteria by more than 10 dB(A). If noise levels exceed the nominated rail
noise criteria by more than 10 dB(A), then the provision of mechanical ventilation should be
incorporated in the design of the building.
3.2 Australian Standard 2107:2000 & Clause 87 of the SEPP
It is usual practice, when we find it necessary to recommend internal sound levels in
buildings to refer to Australian/New Zealand Standard AS/NZS 2107:2000 “Acoustics –
Recommended Design Sound Levels and Reverberations times for Building Interiors”.
This standard provides recommended noise levels for steady state such as noise from building
services and quasi-steady state sounds, such as traffic and rail noise. The noise levels
recommended in AS/NZS 2107:2000 take into account the function of the area and apply to
the sound level measured within the space unoccupied although ready for occupancy.
The standard recommends the following noise levels for residential buildings.
AUSTRALIAN STANDARD AS/NZS 2107:2000 RECOMMENDED DESIGN NOISE LEVELS, LAeq
Type of occupancy Recommended Design Sound Level
Activity Satisfactory Maximum
Houses in areas with negligible transportation
Sleeping Areas 25 35
Houses and Apartments near minor roads
Living Areas 30 40
Sleeping Areas 30 35
Work Areas 35 40
Apartment common areas (e.g. foyer, lift lobby) 45 55
Houses and Apartments near major roads
Living Areas 35 45
Sleeping Areas 30 40
Work Areas 35 45
Apartment common areas (e.g. foyer, lift lobby) 45 55
Similarly, Clause 87 of the SEPP states that where the development is for residential use and
is located in or adjacent to a rail corridor, a consent authority must not grant consent unless it
is satisfied that appropriate measures will be taken to ensure that the following LAeq levels
are not exceeded:
- in any bedroom in the building – 35dB(A) at any time between 10.00p.m. and 7.00a.m.
- anywhere else in the building (other than a garage, kitchen, bathroom or hallway) –
40dB(A) at any time.
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3.3 NOISE SURVEY & INSTRUMENTATION
On the 25th
May, 2015, I/We went to the above address to carry out acoustic measurements
near the building line of the proposed development facing the railway line (Figure 2 – Noise
Reading Location Point B). The measurement procedure and the equipment used for the
noise survey are described below. All sound pressure levels are rounded to the nearest whole
decibel.
All sound level measurements and analysis carried throughout this report are carried with
Svantek 957 Noise and vibration level meter which has the following features:
Type 1 sound level measurements meeting IEC 61672:2002
General vibration measurements (acceleration, velocity and displacement) and HVM
meeting ISO 8041:2005 standard
Three parallel independent profiles
1/1 and 1/3 octave real time analysis
Acoustic dose meter function
FFT real time analysis (1920 lines in up to 22.4 kHz band)
Reverberation Time measurements (RT 60)
Advanced Data Logger including spectra logging
USB Memory Stick providing almost unlimited logging capacity
Time domain signal recording
Advanced trigger and alarm functions
USB 1.1 Host & Client interfaces (real time PC “front end” application supported)
RS 232 and IrDA interfaces
Modbus protocol
In addition to freight trains, the railway corridor services the T3 Bankstown Line. A
conservative representation of determining LAeq is to record readings during peak hours,
mainly 8:00- 9:00 am / 6:00-7:00 am (Mainly Passengers) & 10:00 p.m - 2:00 a.m (Mainly
Freight).
Another method is to carry readings for pass-by trains recording the duration, and LAeq of
each pass–by. To calculate the LAeq,T for a period based on measurements of all pass-bys
during that period then the following equation is used:
LAeq,T = 10 x 𝑙𝑜𝑔10 (∑ 𝑝𝑖 ×100.1×𝐿𝑖
𝑇𝑃)
Where:
pi is the duration of each pass-by, in seconds
Li is the LAeq noise level of the pass-by over that duration
Tp is the duration of the total assessment period (T) in seconds
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3.4 NOISE SURVEY RESULTS
Noise levels were measured adjacent to the railway corridor (Figure 2 – Point B) between
8.00 am and 9.00 am to determine a conservative sample of the LAeq, 1 hour (daytime) and
between 10:00pm and 2:00am to determine a conservative sample of the LAeq, 1 hour
(nighttime).
There were 14 predominately commuter train pass-by movements during the daily hour and
10 during the night hours. Each train pass-by was generally audible for up to 40 seconds. The
external rail noise levels are listed below.
Table 3.4 - Rail Noise Survey Results, Noise Criteria and Noise Reduction Required
3.5 RAIL VIBRATION SURVEY
The floor vibration levels in habitable rooms should comply with the criteria in British
Standard BS 6472-1:2008 Evaluation of Human Exposure to Vibration in Buildings (1 to 8
Hertz). The proposed development is to be located approximately 15 metres away from the
corridor rail line. BS 6472-1:2008 considers the eVDV levels for daytime and night time.
The probability of adverse effects will be low when the eVDV is less than 0.4 during the
daytime and less than 0.24 for the night time periods.
The calculated eVDV found to be 0.18 during the daytime and 0.12 during the night time.
During these train movements, ground vibration levels were only just noticeable to the touch
of the palm of the hand. The palm of the hand can perceive ground vibrations as low as
0.3mm/s. Based on the survey results, vibration levels are well within the low probability of
adverse effects. Any vibration emission will not cause building damage to the proposed
development.
Calculations are as follows:
eVDV = 1.4 × a rms × t 0.25
a rms = weighted rms acceleration of train (m/s2); average = 14mm/sec2= 0.014m/sec2.
(varies between 13 & 15 mm/sec2)
t in sec= total cumulative time of the vibration; say an average of 12 train passes per hour
for 12 hrs (1day) & each train pass is felt for 40 seconds.
Thus t = 14*40*12=6720 secs.
eVDV (day) = 1.4 × 0.014 × (6720) 0.25
eVDV (day) = 0.18 < 0.4 Ok.
At Point B At Point B
LAeq dB(A), 7:00am – 10:00pm
(Conservative Sample)
LAeq dB(A), 10:00pm – 7:00am
(Conservative Sample)
Outdoor
Rail Noise
Noise
Criteria
Noise
Reduction
Outdoor
Rail Noise
Noise
Criteria
Noise
Reduction
63 40.0 23 58 35.0 23
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Similarly eVDV for night time (say 2.5 train passes per hour for 12 hrs & each train pass is
felt for 40 seconds)
eVDV (night) = 0.12 < 0.24 therefore Ok.
4.0 PART 3 - AIRCRAFT NOISE
4.1 ACOUSTICAL STUDY
The site is located north-east of Sydney Airport, between the NEF 20 and NEF 25 contours.
According to Table 2.1 of the above code, any home unit development is not usually
permitted. Note 4 under Table 2.1 states that 'This Standard does not recommend
development in unacceptable areas. However, where the relevant planning authority
determines that any development may be necessary, it is recommended that such
development should achieve the required ANR determined according to Clause 3.2’. The
noise attenuation proposed in this report and the building components treatments described
below will result in a residence that is more acoustically sound than surrounding houses and
existing residence.
All aircraft noise attenuation to be expected from the proposed construction is determined in
accordance with Clause 3.2. Maximum allowable indoor noise level as determined from
Table 3.3 is 50dB(A) for relaxing and sleeping areas, 60dB(A) for toilets and kitchen.
DT, DL, DS determined as per Figure 3.1 page 15 of the above code are as follows:
East - West Runway (metres)
DS 1371
DL 2165
DT 6280 Figure 3 – Critical Runway
The maximum aircraft noise level as determined from Table 3.6 is 75 dB(A) for Boeing 747-
200B for Long-Range Take-Off (North - South Runway). See Figure 8.
The Aircraft Noise Reduction, in sleeping areas and dedicated lounges is 75-50= 25 dB(A)
The Aircraft Noise Reduction in any other habitable spaces is 75-55= 20 dB(A)
The Aircraft Noise Reduction in bathrooms, toilets and laundries 75-60= 15 dB(A)
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5.0 EXTERNAL RECOMMENDATIONS
5.1 WINDOWS/SLIDERS, DOORS, EXTERNAL WALLS & ROOF
Building Component Rw
Rating to
be
Achieved
Windows in Commercial Tenancy are to be 12.5mm Viridian Vlam Hush glass
with full perimeter Schlegel Q-Lon acoustic seals (Ph: 8707-2000) 36-38
Windows & Sliders in Dining/Living/Kitchen & Bedroom Areas of all Units
facing King St & Goodsell St on the 1st Floor – 4
th Floor are to be double glazed
system that is 10mm laminated with 50mm air gap then 10mm laminated with full
perimeter Schlegel Q-Lon acoustic seals (Ph: 8707-2000) or a 6mm laminated
secondary window/slider followed by a min 6mm window at a 100mm gap.
39-42
Windows & Sliders in Dining/Living/Kitchen & Bedroom Areas of all Units
facing King St & Goodsell St on the 5th
Floor – 8th
Floor are to be 10.5mm
Viridian Vlam Hush glass with full perimeter Schlegel Q-Lon acoustic seals (Ph:
8707-2000)
38-40
All other Windows & Sliders in Dining/Living/Kitchen & Bedroom Areas of
all other Units are to be 10mm laminated type with full perimeter Schlegel Q-Lon
acoustic seals (Ph: 8707-2000)(1)
33-36
Windows in Bathrooms/Ensuites/Laundries etc of all units are unrestricted and
to be in accordance with AS 2047 (Windows in Buildings). (1).
-
External Walls are to be Double skin cavity brick walls, brick veneer minimum
270/250 mm double brick/brick veneer construction or any other method of wall
construction with an Rw of 44.
44-46
Roof is to be a minimum 150mm Concrete Roof, on 13mm gypsum plaster board
ceiling with 50mm thick, 15kg/m³ mineral wool batts. 40-44
NB: This report is to be read in conjunction with the BASIX certificate and any other related building specification. (1).
No weep holes in windows/sliders. All gaps between window & door frames and the masonry walls are to be
sealed using acoustic foam Hilti CP620 or similar. Glass wool batts can be applied prior to the application of the
foam to seal larger gaps. (2).
All gaps are to be acoustically sealed.
5.2 CAR PARK MECHANICAL VENTILATION
The proposed two (2) levels of basement parking at No. 641-657 King St, Newtown are
located below ground level and that makes providing natural ventilation not possible and a
mechanical extract system should be used. The mechanical ventilation system needs to
achieve six air changes per hour for exhaust fume extract and ten air changes per hour for
smoke clearance.
The noise from proposed mechanical plant is governed under Section 2.1 of the NSW
Industrial Noise policy. Noise intrusion from the mechanical plant & equipment is generally
considered acceptable if the weighted level of noise from the source measured over a 15
minutes interval does not exceed the rating background noise level (RBL) by more than 5dB
at the boundary of the nearest residential receiver
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LAeq,15 minutes < rating background level + 5
Section 3.1 of the above policy defines the background level as LA90,15 minutes which is the
Noise exceeded 90% percent of a time period over which annoyance reactions may occur
(taken to be 15 minutes). The RBL is defined as the overall single-figure LA90,15 minutes
background level representing each assessment period (day/evening/night) over the whole
monitoring period. Background noise levels in the area are governed by traffic noise from
King St, railway noise from the nearby Railway Line and aircraft noise from Sydney Airport.
To achieve compliance with the nominated noise criteria, the following noise mitigation
measures are recommended:
MECHANICAL PLANT RECOMMENDATIONS
Car Park Supply air Install a silencer Min 2D (E29/90)1
or
Equivalent.
Car Park Exhaust Fan
Provide silencer before and after Fan.
Silencer Min 2D (E29/90)1
or Equivalent.
Lagged duct with min 38mm 32 kg/m3
acoustic insulation a minimum 10 metres into
the car park
Note:
1. All silencers should be placed 1 to 2 duct diameter distance away from the fans.
Specifications of silencers/acoustic louvers are provided in Table below
Insertion Loss of Recommended Silencers [dB]
FREQUENCY [Hz] 63 125 250 500 1000 2000 4000 8000
Attenuator/Silencer 6 11 18 31 36 27 24 17
Alternative attenuator/silencer or acoustic louvers can be considered provided that the
insertion loss values are equal or greater than the values specified in the Table above.
Once the development application for the proposed development has been approved and a
Mechanical Services Plan has been prepared, further acoustic assessment is to be carried out
for the proposed mechanical plant in order to achieve compliance with the above listed
criteria. This will be achieved through the use of silencers and/or lagging of ducts, if
necessary. A qualified acoustical consultant may be required to progressively inspect the
installation of various suppression components and certify to council that it meets
installation.
5.3 MECHANICAL VENTILATION for RESIDENTIAL UNITS
To achieve the indoor design sound levels required to habitable areas, it is assumed that the
windows and doors are closed to avoid noise intrusion. Habitable Areas should not exceed 40
dB(A) during day the while bedrooms are not to exceed 35 dB(A) during the night.
Windows openable by 20% cause a 10 dB(A) reduction between the internal and external
noise levels. The “Development near Rail Corridors and Busy Roads – Interim Guideline”
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Reference No.: 2015-286 Rev1
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page 19, Section 3.6.1 states that “If internal noise levels with windows or doors open exceed
the criteria by more than 10 dB(A), the design of the ventilation for these rooms should be
such that occupants can leave windows closed, and also to meet the ventilation requirements
of the Building Code of Australia.”
Applying the above for the proposed development, we recommend that mechanical or natural
ventilation is required for all residential units facing King St for the proposed development at
No. 641-657 King St, Newtown.
Specific ventilation requirements are outside of our scope of expertise; however an
acoustically insulated building must be kept virtually air tight to exclude external noise.
Therefore mechanical ventilation, noise absorbing ventilators or air-conditioning are needed
to provide fresh air and to control odours.
Requirements for ventilation are given in the Building Code of Australia (BCA) under
Section 3.8.5. Indoor air quality is given in Australian Standard AS 1668.2 - 2002, “The use
of ventilation and air-conditioning in buildings - Ventilation design for indoor air
contaminant control”. The following are typical ways to achieve ventilation through the
property with windows closed:
1. Ducted Air-Conditioning System where the Fan Coil Units provide outside air mixed
with the return air is always considered as a first option. Ductwork and plenums must
be acoustically treated.
2. A device similar/equivalent to the Aeropac Room Ventilator and Air-Filter is fitted to
the required rooms.
3. Silenceair external wall vents, together with upgraded toilet and laundry fans to
provide forced flow-through ventilation. The fans in this case must be operating
whenever external doors/windows are closed (available from www.silenceair.com)
4. Fresh air fan system to draw air from the façade with no view of the main road into
the residence could also be used.
Acoustic Report for No. 641-657 King Street, Newtown
Reference No.: 2015-286 Rev1
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6.0 Discussion and Conclusion
As the acoustical study above shows, we certify that the internal noise attenuation levels for
the proposed development at No. 641-657 King Street, Newtown will satisfy the
requirements of the Building Code of Australia, AS 3671 ‘Road Traffic Noise Intrusion –
Building Siting and Construction’, AS 2107 ‘Acoustics – Recommended Design Sound
Levels and Reverberation Times’, AS 2021 ‘Acoustics-Aircraft Noise Intrusion –Building
Siting and Construction’, Clause 102 of the State Environmental Planning Policy –
(Infrastructure) 2007, NSW Road Noise Policy, NSW Department of Planning’s
‘Development near Rail Corridors and Busy Roads – Interim Guideline’, Marrickville
Council conditions and requirements; provided that the above recommended materials are
used in construction.
The internal noise levels in the proposed development will enable reasonable amenity for the
occupants.
We hope this report meets your requirements. Should you require further explanations, please
do not hesitate to contact us.
Yours Sincerely,
M. Zaioor
M.S. Eng’g Sci. (UNSW).
M.I.E.(Aust), CPEng
Australian Acoustical Society (Member)
Acoustic Report for No. 641-657 King Street, Newtown
Reference No.: 2015-286 Rev1
17
7.0 Appendix
Figure 1 Site Location .............................................................................................................. 18 Figure 2 Noise Reading Location ............................................................................................ 19 Figure 3 Critical Runway ......................................................................................................... 20
Figure 4 Noise Survey ............................................................................................................. 21
Acoustic Report for No. 641-657 King Street, Newtown
Reference No.: 2015-286 Rev1
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Figure 1 Site Location
Acoustic Report for No. 641-657 King Street, Newtown
Reference No.: 2015-286 Rev1
19
Figure 2 Noise Reading Location
Point A – Noise
Reading Location
Point B – Noise
Reading Location
Acoustic Report for No. 641-657 King Street, Newtown
Reference No.: 2015-286 Rev1
20
Figure 3 Critical Runway
DS
DL
DT
Acoustic Report for No. 641-657 King Street, Newtown
Reference No.: 2015-286 Rev1
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Figure 4 Noise Survey
0
10
20
30
40
50
60
70
80
90
100
16
:45
:00
21
:30
:00
2:1
5:0
0
7:0
0:0
0
11
:45
:00
16
:30
:00
21
:15
:00
2:0
0:0
0
6:4
5:0
0
11
:30
:00
16
:15
:00
21
:00
:00
1:4
5:0
0
6:3
0:0
0
11
:15
:00
16
:00
:00
20
:45
:00
1:3
0:0
0
6:1
5:0
0
11
:00
:00
15
:45
:00
20
:30
:00
1:1
5:0
0
6:0
0:0
0
10
:45
:00
15
:30
:00
20
:15
:00
1:0
0:0
0
5:4
5:0
0
10
:30
:00
15
:15
:00
20
:00
:00
0:4
5:0
0
5:3
0:0
0
10
:15
:00
15
:00
:00
No
ise
Le
vel (
A)
Average Statistical Noise Level 25th May, 2015 - 1st June, 2015
LAeq [dB]
L01 [dB]
L10 [dB]
L90 [dB]