2.2 Layout and Use description 2.3 Noise-sensitive ... daps/metro central... · 2.2 Layout and Use...
Transcript of 2.2 Layout and Use description 2.3 Noise-sensitive ... daps/metro central... · 2.2 Layout and Use...
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2.2 Layout and Use description
We understand this development will be a double storey building. The layout is based on the McDonalds MOD_514 design.
Access to the subject site is via Reynolds Road.
Two drive-through Customer Order Device (COD) units are proposed to be located in the drive through, on the western side the building.
An off-loading bay is located between the northern end of the building and car parking bays and will be used for deliveries. Waste collection is from the staff carpark area to the west of the building.
The site plan for the development is shown in Figure 2.
2.3 Noise-sensitive premises nearby
The closest noise-sensitive premises to the proposed development are presented in Table 1 and are identified in the aerial photo in Figure 3.
We note that the residence at 840 Canning Highway will be shielded from noise on the development site by the two storey buildings on 842 Canning Highway therefore this receiver was not considered in this assessment.
Table 1: Closest noise-sensitive premises
Property address Type
35 Reynolds Road (north) single storey
842 Caning Highway (north-west) double storey
34A Reynolds Road (north-east) single storey
859 Canning Highway (south-east) double storey
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Figure 2: Site layout (Hindley & Associates, DA02, March 2015)
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Figure 3: Aerial view of proposed development and nearby residences (imagery source Hindley DA docs)
3.0 NOISE CRITERIA
External noise emission from building services plant and other noise sources is governed by the Western Australia Environmental Protection (Noise) Regulations 1997 (the Noise Regulations). The Noise Regulations are a “prescribed standard” under the Environmental Protection Act 1986.
Under the Noise Regulations, noise emissions from one premises when assessed at another must comply with a set of noise limits. The noise limits applicable at a receiver are calculated by adding to a base noise limit an influencing factor (IF), which takes into account the land use and number of significant roads in the surrounding area. These noise limits are known as ‘assigned noise levels’ and apply at the receiving premises, of which there are three kinds: noise sensitive premises (e.g. residences, hotels, schools, aged care, etc.), commercial premises (e.g. offices, retail shops, etc.) and industrial premises. The assigned noise levels depend on the type of receiving premises, the time of day and day of the week.
The noise emissions are assessed over an assessment period which is between fifteen minutes and four hours. The assessment period must be appropriate for the assessment of the emission and depends on the type and character of the noise source(s).
The assigned noise levels are defined in terms of statistical A-weighted and Slow-weighted sound pressure levels and are:
LA 10, this is the noise level not to be exceeded for more than 10% of the assessment period.
LA 1, this is the noise level not to be exceeded for more than 1% of the assessment period.
LA max, this is the noise level not to be exceeded at any time.
34A Reynolds Road
35 Reynolds Road
859 Canning Hwy
842 Canning Hwy
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The assigned noise levels are presented in Table 2.
Table 2: Summary of Assigned noise levels
Type of premises receiving noise
Time of Day Assigned noise level (dB)
LA 10 LA 1 LA max
Noise sensitive premises: highly sensitive area
0700-1900 Monday to Saturday 45 + IF 55 + IF 65 + IF
0900-1900 Sunday and public holidays 40 + IF 50 + IF 65 + IF
1900-2200 all days 40 + IF 50 + IF 55 + IF
2200-0700 Monday to Saturday or 2200-0900 Sunday and public holidays
35 + IF 45 + IF 55 + IF
In addition, the noise emissions must be free of annoying characteristics such as: impulsiveness, modulation and tonality. The elimination of annoying characteristics should be a priority in the design process. In cases when annoying characteristics cannot be eliminated, adjustments to measured or calculated levels are applied. These adjustments are presented in Table 3 below.
Table 3: Adjustments for annoying characteristics
Adjustment where noise emission is not music. These adjustments are cumulative to a maximum of 15dB.
Adjustment where noise emission is music
Where tonality is present
Where modulation is
present
Where impulsiveness is
present
Where impulsiveness is not present
Where impulsiveness is present
+5dB +5dB +10dB +10dB +15dB
3.1 Influencing factor calculation
The relevant zoning map for the area is provided in Appendix B.
The assumptions made to estimate the influencing factor at the receiver at 35 Reynolds Road are presented in Table 4. We note that at the other residences; 34 Reynolds Road, and 842 and 859 Canning Highway, the influencing factor would be similar or slightly greater but we used the most conservative influencing factor for all four residences.
Table 4: Influencing factor calculation assumptions
Type Description Contribution to IF
Industrial Land None within 450 metres 0dB
Commercial Land Land in light blue on map:
22% within 100 metres
Negligible within 450 metres
1.1dB
0dB
Major roads Canning Hwy within 100 metres 6dB
Secondary roads None within 100 metres 0dB
Influencing Factor (rounded to nearest dB), IF 7dB
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3.2 Assigned noise levels
Based on the above, the assigned noise levels applicable to the residences surrounding the proposed development are presented in Table 5.
Table 5: Assigned noise levels applicable to nearest residences
Type of premises receiving noise
Time of Day Assigned noise level (dB)
LA 10 LA 1 LA max
Nearby residences 0700-1900 Monday to Saturday 52 62 72
0900-1900 Sunday and public holidays 47 57 72
1900-2200 all days 47 57 62
2200-0700 Monday to Saturday or 2200-0900 Sunday and public holidays
42 52 62
3.3 Specified works (waste collection, car park cleaning, etc.)
Regulation 14A of the Noise Regulations prescribes that noise emissions from specified works such as carpark cleaning, do not have to comply with the assigned noise levels if the works are carried out in accordance with regulation 14A(2):
during daytime hours
o 07:00 to 19:00 Monday to Saturday (excluding public holiday), or
o 09:00 to 19:00 on a Sunday or public holiday
in the quietest reasonable and practicable manner, and
using the quietest equipment reasonably available.
In the case where specified works are to be carried outside daytime hours (class 2 works) and their noise emissions are likely not to comply with Regulation 7, the works also need to be carried out according to a Noise Management Plan which has been approved by the local government authority CEO.
Predicted noise levels from specified works at the development are presented in Section 4.7 and are further discussed in Section 5.3.4.
4.0 NOISE MODEL
MDA has used a 3D acoustic computer model (Soundplan 7.3) to estimate noise levels from the proposed McDonalds restaurant to the nearest residential dwellings.
The estimates are based on the assumptions described in the following sections.
4.1 Modelling assumptions
The assumptions and noise controls required to achieve compliance are presented in Table 6 and, where applicable, illustrated in Figure 4.
Table 6: Summary of assumptions and noise controls
Item Description
Restaurant operating hours 24 hours per day, 7 days per week
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Item Description
Delivery times Restricted to daytime (Mon-Sat 0700 to 1900, Sunday and public holidays 0900 to 1900)
Waste collection times Restricted to daytime (Mon-Sat 0700 to 1900, Sunday and public holidays 0900 to 1900)
If reversing alarms are required, truck to be fitted with broad-band reversing alarms
Carpark cleaning Restricted to daytime (Mon-Sat 0700 to 1900, Sunday and public holidays 0900 to 1900)
Hand-held professional leaf blower only
1 to 2 times a month
Noise walls 2.8 metres high wall spanning the entire width (east-west) of the development on north boundary
2.4m high wall with 0.5m x 0.5m minimum overhang over the closest drive through lane on west boundary
Existing 1.2m to 1.8m high fence from end of 2.4m wall to south boundary.
CODs Localised acoustic canopy. Example shown in Appendix C.
Mechanical services Fans 1 to 6 are to operate on low speed (i.e. low noise) setting during the night-time period.
Building parapets are min. 8.46m above ground. Refer to Appendix E for mechanical plant layout.
4.2 Model setup
The following assumptions in relation to the noise model were made:
Local topography included,
Local ground absorption (‘hard’ for roads and carpark, ‘soft’ for grassed areas),
All sensitive receivers as nominated in Section 2.3,
All existing buildings including any fencing which would provide noise barrier effects,
Proposed McDonalds restaurant double storey building, and
Noise sources and associated sound power levels as nominated in sections below.
Given the distance from source to the closest receivers is much less than 100 metres, we consider the CONCAWE algorithm is not appropriate in this specific case. Instead, the noise levels at all receivers were estimated based on the ISO Standard 9613-2 with the following meteorological conditions: 50% relative humidity and 15oC.
A schematic drawing of the acoustic model is shown in Appendix D.
4.3 Mechanical plant
This development is a based on the McDonalds store MOD_514 series layout and includes the equipment listed in Table 7 and Table 8 below.
The mechanical plant layout and parapet walls location and height used in this assessment are shown in Appendix E.
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Table 7: Roof mounted mechanical equipment sound power level, dB
Unit Operating
mode Model
Octave band centre frequencies (Hz) Data type
125 250 500 1k 2k 4k
AC1 Max PKY620T-6Q1 87 85 82 77 72 70 In-Duct
AC2/3 nominal PCG290L_R 74 71 72 72 69 66 In-Duct
AC4 nominal PCG153U 72 73 72 69 66 62 In-Duct
AC5 nominal PCA230U 75 76 75 73 69 65 In-Duct
AC1 High PKY620T-6Q1 89 89 82 79 76 71 Free Field
AC2/3 High PCG290L 76 76 75 72 70 68 Free Field
AC4/5 High TBC 77 77 76 73 71 69 Free Field
AC6 High TBC 67 67 66 63 61 59 Free Field
Refrigeration* n/a MAC90RP 67 84 76 75 71 63 Free Field
(*) Unit manufactured for McDonalds by Channon Refrigeration Pty Ltd.
Table 8: Fans sound power level, dB
Unit Model Octave band centre frequencies (Hz)
Data type 63 125 250 500 1k 2k 4k
FAN1 CE354V 79 77 73 70 61 63 62 In-Duct
FAN2 CGD354 79 77 73 70 61 63 62 In-Duct
FAN3 CGD354 79 77 73 70 61 63 62 In-Duct
FAN4 CGD454 84 82 77 74 68 69 69 In-Duct
FAN5 CE192V 68 69 69 66 59 58 56 In-Duct
FAN6 CE354V 79 77 73 70 61 63 62 In-Duct
4.4 Drive through
Use of the drive through consists of a vehicle entering the drive-through, idling while placing an order, moving forward to the collection point, idling while collecting the order and finally, driving away.
This scenario has been represented in the noise model using as series of point sources located along the vehicle paths over the length of the drive through lanes in order to derive the statistical noise levels (LN).
The following vehicle noise data and source heights used are presented in Table 9.
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Table 9: Vehicle sound power levels, dB
Noise source Octave band centre frequency (Hz) Source height
63 125 250 500 1k 2k 4k metre
‘Normal’ car driving through 90 83 78 78 77 75 71 0.5
‘Worst-case’ car driving through 102 100 96 90 88 84 84 0.3
4.5 Customer Ordering Devices (COD)
There will be two CODs overall, one in each drive through lane. MDA have measured noise levels of CODs at several existing McDonalds stores and has determined representative sound power level data for these devices. These are presented in Table 10.
Table 10: COD unit sound power level, dB
Noise source Octave band centre frequency (Hz) Source height
63 125 250 500 1k 2k 4k metre
COD Unit 78 77 75 79 79 79 69 1.2
COD Unit (max) 86 83 79 89 100 82 73 1.2
4.6 Deliveries
The noise emissions from deliveries were split into two distinct activities in the noise model: vehicle movements; and delivery.
The sound power data for vehicle movements includes engine noise for various trucks types and represents the pass by noise level.
The data for delivery represents the maximum noise level (Lmax) generated during the delivery from one off events such as impact noises during pallet off-loading or opening/closing of truck doors. We note that during deliveries the truck engine will be switched off.
The sound power levels used in the model for each activity are presented in Table 11 and Table 12.
Table 11: Sound power levels of vehicle movements used in pass-by noise prediction, dB
Noise source Octave band centre frequency (Hz) Source height
63 125 250 500 1k 2k 4k metre
Bun delivery 86 84 82 82 82 79 72 1.5
Main delivery 101 95 94 92 94 91 88 1.5
Table 12: Maximum sound power levels of delivery, dB
Noise source Octave band centre frequency (Hz) Source height
63 125 250 500 1k 2k 4k metre
Buns and main deliveries (Lmax)
111 109 105 99 97 96 95 1
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4.7 Waste collection and carpark cleaning
The noise emissions from waste collections and carpark cleaning activities were assessed independently from other activities on-site.
For waste collections, sound power data for garbage truck movements includes engine noise and represents the pass by noise level while the maximum sound power data represents bin pick-up, waste being emptied into truck and bin placed back on the ground.
The sound power levels used in the model for each activity are presented in Table 13 and Table 14.
Table 13: Sound power levels of equipment, dB
Noise source Octave band centre frequency (Hz) Source height
63 125 250 500 1k 2k 4k metre
Garbage truck (10 tonnes, 10kph)
102 100 98 98 98 95 88 1.5
Leaf blower 89 102 106 104 104 103 101 1.5
Table 14: Maximum sound power levels of delivery, dB
Noise source Octave band centre frequency (Hz) Source height
63 125 250 500 1k 2k 4k metre
Waste collection (Lmax) 115 117 112 107 105 104 103 1.5
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Figure 4: Site plan showing location, extent and height of noise walls
2.4m
HIG
H M
ASO
NR
Y W
ALL
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5.0 ASSESSMENT
5.1 Representative Assessment Period (RAP)
The assigned noise levels are statistical noise levels occurring over a Representative Assessment Period (RAP) which is technically determined by an inspector or authorised officer. However, based on previous experience of similar projects we considered a RAP of 30 minutes is appropriate for the purpose of assessing the noise emissions from this development.
For a 30 minute RAP period, the assigned levels therefore mean:
The LA 10 is the noise level not to be exceeded for more than 180 seconds in any 30 minutes;
The LA 1 is the noise level not to be exceeded for more than 18 seconds in any 30 minutes; and
The LA max is the noise level not to be exceeded at any time.
5.2 Noise predictions
Noise from all sources on the site must meet the assigned noise levels. Compliance is determined by comparing the predicted noise level to the relevant assigned levels at the nearest affected residential dwellings.
5.2.1 Mechanical plant
The predicted noise levels from mechanical plant are presented in Table 15. For the purposes of this assessment it was assumed all plant operates simultaneously and continuously over extended periods of time. Therefore the applicable criterion for mechanical plant noise is the night-time LA 10.
Table 15: Predicted noise level of mechanical plant, dB
Receiver 34 Reynolds Road
35 Reynolds Road
842 Canning Hwy 859 Canning hwy
Time period GF L1 GF L1
All 35 33 29 33 36 37
5.2.2 Drive through
Noise predictions for vehicle movement are dependent on various factors including the number of vehicles, the type of vehicle, the vehicle speed and the path the vehicle takes as it moves around the site.
Estimates of overall customer numbers (over 24hrs) were taken from the existing store and typical hourly patronage was obtained from the traffic engineer. The typical hourly patronage profile over 24hrs as a percentage of total customers is presented in Figure 5.
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Figure 5: Typical hourly McDonalds patronage data
We assumed this typical patronage profile also applies to the drive-through use and derived the traffic flow assumptions for this development which are presented in Table 16.
Table 16: Drive through assumptions
Time period Day
(0700 – 1900)
Evening
(1900 – 2200)
Night
(2200 – 0900)
Overall vehicle movements 2460 vehicles over 24hrs
Drive through peak traffic in any RAP by time period 34 25 22
Number of ‘worst’ car (5% of total) 1 1 1
Vehicle idling in Wait Bays 2 2 2
The predicted noise levels at each receiver are presented in Table 17. These were predicted based on the sound power levels for each vehicle types (Table 9) and the traffic flow information presented in Table 16.
Table 17: Predicted LA N night-time noise levels from drive through and applicable assigned level, dB
Receiver 34 Reynolds Road
35 Reynolds Road
842 Canning Hwy
859 Canning hwy
Applicable Assigned Level
Noise Source GF L1 GF L1
‘Normal’ cars 39 38 37 41 36 35 LA 10
‘Worst’ car 49 50 49 52 45 44 LA 1
5.2.3 Customer Ordering Devices (CODs)
Measurements performed at a number of McDonalds drive through indicate that the average time that the COD is in use during an order is 16 seconds. Table 18 presents the criteria applicable to the COD noise emissions based on the numbers of cars over each time period.
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Table 18: COD usage assumptions and applicable assigned level
Time period Order time length
CODs in use Applicable Assigned Level
Day 16s 2 LA 10
Evening 16s 2 LA 10
Night 16s 2 LA 10
The predicted noise levels at each receiver are presented in Table 19. These were predicted based on the sound power levels in Table 10 and the information presented in Table 18. In addition, since the instantaneous noise level of the COD will vary over time (speech is naturally variable), there will be a difference between the LAeq (on which the predictions are based) and LA 10 noise levels used for the assessment. To account for this at the receiver position, a 2dB adjustment has been applied. The adjustment is based on previous COD noise measurement by MDA.
Table 19: Predicted noise levels from CODs, dB
Receiver 34 Reynolds Road
35 Reynolds Road
842 Canning Hwy 859 Canning hwy
COD noise GF L1 GF L1
LA 10, both CODs in use 31 35 34 34 22 23
LA max of either CODs 44 50 49 50 33 34
5.2.4 Deliveries
The following deliveries are proposed to occur at this site:
2 main deliveries per week by a 5-10 tonne truck (main delivery).
3 - 4 bun deliveries per week by a 3-5 tonne truck (bun delivery).
The assumptions made in regard to deliveries are presented in Table 20 and the predicted noise levels at each receiver for the main deliveries are presented in Table 21. Given the lower sound power levels for the bun delivery truck, the predicted noise levels will be lower and have therefore not been presented.
Table 20: Deliveries assumptions
Time period Monday to Saturday
0700-1900
Sunday and public holidays
0900-1900
Truck speed, km/hr 5 3
Path length, m 165 165
Delivery overall duration (inc. truck entering and leaving site), seconds
134 134
Applicable assigned level LA 1 = 62 LA 1 = 57
LA max = 72 LA max = 72
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Table 21: Predicted noise level from main deliveries, dB
Receiver 34 Reynolds Road
35 Reynolds Road
842 Canning Hwy 859 Canning hwy
GF L1 GF L1
Main delivery pass by noise, LA 1
49 51 51 57 51 51
Maximum LA max 43 40 57 60 45 44
5.2.5 Car park
Up to 29 car parking bays are provided for customers and staff as part of the development. We consider the noise emissions from vehicles movements within the car park are unlikely to impact on the amenity of the nearby residences since:
the development is adjacent to a major road (Canning Highway), and
vehicle movements within the car park are short duration transient events.
However, individual events such as car doors slamming or cars starting and revving can, especially at night, can have adverse impacts on the amenity of the local residents. Such events are of short duration and have therefore estimated the Lmax noise levels from such events at all nearby receivers. The estimated levels, based on the worst-case car park locations (see Appendix D), are presented in Table 22.
Table 22: Predicted noise level from car park, dB
Receiver 34 Reynolds Road
35 Reynolds Road
842 Canning Hwy 859 Canning hwy
GF L1 GF L1
LA max 54 57 53(*)
50 50 48 (*) the higher predicted noise levels at the ground floor at receiver 842 Canning Highway is the result of a car parked in the staff carpark
5.2.6 Waste Collection and carpark cleaning
Regulation 14A applies to this type of activity therefore, the noise impact from waste collection at the McDonalds development was not specifically assessed against the assigned noise levels. Generic recommendations to comply with the Regulation 14A requirements are presented in Section 5.3.4.
Table 23: Predicted noise level from main deliveries, dB
Receiver 34 Reynolds Road
35 Reynolds Road
842 Canning Hwy 859 Canning hwy
GF L1 GF L1
Garbage truck pass by noise, LA 1
53 55 55 60 52 51
Waste collection, LA max 53 57 65 68 52 51
Carpark cleaning, LA 10 67 69 66 71 63 63
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5.3 Compliance assessment
The noise emissions from the development were assessed at the most affected receivers and against the applicable assigned noise level for the time period of interest.
5.3.1 LA 10 Assigned Noise Level
Based on the assumptions made above, night-time is the most stringent time period and therefore compliance with the night-time LA 10 assigned noise levels will result in compliance with the LA 10 for all other time periods. A summary of our assessment with the night-time LA 10 assigned noise level is presented in Table 24.
Table 24: Summary of assessment against night-time LA 10 assigned noise level, dB
Mechanical plant
Drive through
CODs Overall Night-time Assigned Level
Complies
34 Reynolds Road 35 39 31 41 42 Yes
35 Reynolds Road 33 38 35 41 42 Yes
842 Canning Hwy (upper floor)
33 41 34 42 42 Yes
859 Canning Hwy (ground floor)
36 36 22 39 42 Yes
5.3.2 LA 1 Assigned Noise Level
Based on the assumptions made above, night-time is the most stringent time period and therefore compliance with the night-time LA 1 assigned noise levels will result in compliance with the LA 1 for all other time periods. A summary of our assessment against the night-time LA 1 assigned noise level is presented in Table 25.
Deliveries only occur during the daytime period therefore a separate assessment is presented in Table 26.
Table 25: Summary of drive through assessment against night-time LA 1 assigned noise level, dB
Worst car Night-time Assigned Level
Compliance
34 Reynolds Road 49 52 Yes
35 Reynolds Road 50 52 Yes
842 Canning Hwy (upper floor) 52 52 Yes
859 Canning Hwy (ground floor) 45 52 Yes
Table 26: Summary of main deliveries noise against day time LA 1 assigned noise level, dB
Deliveries Assigned Level (day time) Compliance
LA 1 Monday to Saturday
Sunday and public holidays
34 Reynolds Road 49 62 57 Yes
35 Reynolds Road 51 62 57 Yes
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Deliveries Assigned Level (day time) Compliance
LA 1 Monday to Saturday
Sunday and public holidays
842 Canning Hwy (upper floor) 57 62 57 Yes
859 Canning Hwy (ground floor) 51 62 57 Yes
We note the noise emissions from the bun deliveries are lower than the main deliveries therefore bun delivery compliance with this criterion will also be achieved.
5.3.3 LA max Assigned Noise Level
A summary of our assessment against the night-time and day time LA max assigned noise level are presented in Table 27 and Table 28 respectively.
Table 27: Summary of assessment against night-time LA max assigned noise level, dB
CODs Car park Assigned Level Compliance
34 Reynolds Road 47 53 62 Yes
35 Reynolds Road 50 57 62 Yes
842 Canning Hwy (upper floor) 51 53 62 Yes
859 Canning Hwy (ground floor) 34 50 62 Yes
Table 28: Summary of assessment against day time LA max assigned noise level, dB
Deliveries Assigned Level Compliance
34 Reynolds Road 43 72 Yes
35 Reynolds Road 40 72 Yes
842 Canning Hwy (upper floor) 60 72 Yes
859 Canning Hwy (ground floor) 45 72 Yes
5.3.4 Specified works (class 1)
In the case of this development specified works include waste collection and the cleaning of the carpark, both of which are carried out by sub-contractors. These activities will only be carried out during day time hours and sporadically. As such, they are considered class 1 works under regulation 14A.
The noise emissions from the class 1 works at the proposed development were predicted to inform the application process. However, as presented in Section 3.3, the noise emissions do not have to comply with Regulation 7 provided the works are carried out in accordance with regulation 14A(2).
To comply with the requirements of regulation 14A(2) we recommend the following:
Reversing alarms to be of the type that emits broadband noise in lieu of tonal reversing beepers
Use of impact matting under large waste bins to minimise impulsive noise
Source quietest equipment reasonably available
If reasonable and practicable, also source or modify equipment to avoid annoying characteristics
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Favour use of newer equipment as they are generally quieter
Undertake regular checks and maintenance of vehicles and equipment to identify/repair noisy items.
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6.0 CONCLUSIONS
Marshall Day Acoustics assessed the noise emissions from the proposed McDonalds development to be located on Lot 145 and Lot 146 on Canning Highway in Applecross.
Based on the assumptions and noise controls described in Section 4.1, our assessment demonstrates that the predicted noise emissions from the proposed development comply with the applicable assigned noise levels for all time periods at all receivers.
6.1 Annoying Characteristics
The noise emissions from the mechanical plant are unlikely to be tonal when assessed at the noise-sensitive receivers given the following:
The separation distances from sources to receiver
There is no direct line of sight between any mechanical plant equipment and receivers
Our experience on similar projects indicating that where several sources operate simultaneously, tones are masked by other sources within the development
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APPENDIX A GLOSSARY OF TERMINOLOGY
Frequency The number of pressure fluctuation cycles per second of a sound wave. Measured in units of Hertz (Hz).
Hertz (Hz) Hertz is the unit of frequency. One hertz is one cycle per second. One thousand hertz is a kilohertz (kHz).
Octave Band A range of frequencies where the highest frequency included is twice the lowest frequency. Octave bands are referred to by their logarithmic centre frequencies, these being 31.5 Hz, 63 Hz, 125 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz, 4 kHz, 8 kHz, and 16 kHz for the audible range of sound.
SPL or LP Sound Pressure Level A logarithmic ratio of a sound pressure measured at distance, relative to the threshold of hearing (20 µPa RMS) and expressed in decibels.
SWL or LW Sound Power Level A logarithmic ratio of the acoustic power output of a source relative to 10-12 watts and expressed in decibels. Sound power level is calculated from measured sound pressure levels and represents the level of total sound power radiated by a sound source.
dB Decibel The unit of sound level.
A-weighting The process by which noise levels are corrected to account for the non-linear frequency response of the human ear.
LAeq The equivalent continuous (time-averaged) A-weighted sound level. This is commonly referred to as the average noise level.
LA 1 The noise level exceeded for 1% of the assessment period, measured in dBA.
LA 10 The noise level exceeded for 10% of the assessment period, measured in dBA.
LA max The A-weighted maximum noise level, measured in dBA.
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APPENDIX B LAND USE MAP
Figure 6: Land use map with 100m and 450m radius circles centred on receiver at 35 Reynolds Road