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Melbourne Sydney Adelaide Brisbane
Vipac Engineers and Scientists Limited
Level 2, 146 Leichhardt Street, Spring Hill, QLD 4000, Australia
70Q-18-0520-TRP-8550198-1 Commercial-In-Confidence Page 4 of 46
1 INTRODUCTION
Vipac Engineers & Scientists Ltd (Vipac) was commissioned by Mirvac Pacific Pty Ltd to carry out a rail noise
impact assessment for Stage 7.3 of the proposed Gainsborough Greens residential development located on
Gainsborough Drive/Kosciuszko Circuit, Pimpama (Lot 3001 on SP291537). This rail noise assessment
includes the following:
Description of the development;
Discussion of the applicable noise criteria;
Prediction of rail noise levels for the lots in the proposed development;
Assessment of predicted rail noise levels against applicable noise criteria;
Discussion of noise mitigation if required; and
Recommendations and conclusion.
2 PROPOSED DEVELOPMENT AND SURROUNDING AREA
The proposed residential development is located on Gainsborough Drive/Kosciuszko Circuit, Pimpama in an
area zoned Medium Density Residential under the City of Gold Coast City Plan. The surrounding land uses
are as follows:
North – Existing detached residential dwellings
East – Vacant Land;
South – Existing detached residential dwellings
West – 1.8m acoustic barrier along the top half the site boundary, the Brisbane-Gold Coast Railway
line and the Old Pacific Highway.
The location of the proposed development is presented in Figure 2-1. Architectural drawings are presented in
Appendix A.
Figure 2-1: Proposed Site Location (City of Gold Coast City Plan)
Site Location
Mirvac Pacific Pty Ltd
Gainsborough Greens – Stage 7.3
Noise Impact Assessment
14 January 2019
70Q-18-0520-TRP-8550198-1 Commercial-In-Confidence Page 5 of 46
The proposed development comprises of 194 lots and the site layout is presented in Figure 2-2.
Figure 2-2: Site Layout and Existing 1.8m Acoustic Barrier
3 EXISTING NOISE ENVIRONMENT
Attended and unattended noise measurements were conducted at the development site between 19th
November 2018 and 22nd November 2018 using 4 environmental noise loggers and a sound level meter. The
noise loggers were used to record noise levels at 15 minute intervals with the microphone set up in free field at
1.5m above ground level. All monitors were calibrated before and after the measurements and no significant
drift was noted (<0.5 dB). A list of the equipment used is presented in Table 3-1.
Table 3-1: Summary of Measurement Equipment
Instrument Serial Number Last Calibration Date at the time of
measurement Attended Measurements
Bruel & Kjær Type 2270 SLM 3006707 20th July 2018
Ono Sokki SC-2120 Sound Calibrator 35100926 29th January 2018 Unattended Measurements
RION NL-21 01277353 17th July 2018
RION NL-21 00776884 25th January 2018
RION NL-21 00776884 23rd August 2017
Larson Davis 831 2057 1st March 2017
Existing 1.8m
Acoustic
Barrier
Mirvac Pacific Pty Ltd
Gainsborough Greens – Stage 7.3
Noise Impact Assessment
14 January 2019
70Q-18-0520-TRP-8550198-1 Commercial-In-Confidence Page 6 of 46
The measurements were conducted in general accordance with Australian Standard AS 1055:1997 –
“Acoustics – Description and measurement of environmental noise”. Further information on the
instrumentation, measurement details, measurement results and weather data for the monitoring period are
presented in Appendix B. Weather conditions were fine during the noise monitoring, with some rainfall on the
last day upon the noise logger retrieval. This data has been excluded from our monitoring results.
The environmental noise loggers were installed near the site boundary to the west of the site as shown in
Figure 3-1.
Figure 3-1: Noise Monitoring Locations
The terrain of the development site is higher than that of the train line, and as a result, the trains were only
partially visible when passing through. The day time noise environmental noise during the site visit on 19 th
November was bird and insect noises, and the occasional train and traffic.
3.1 ATTENDED MEASUREMENTS
Attended measurements were conducted in close proximity to Location 3 for rail noise whilst on site on the
19th of November 2018. Two passenger trains passed by between 2:30pm and 2:45pm and the measurement
results were recorded. The attended and unattended measurements for that time period for the train passbys
are presented in Table 3-2.
Location 1
(353)
Location 2
(2057)
Location 3
(884)
Location 4
(886)
Mirvac Pacific Pty Ltd
Gainsborough Greens – Stage 7.3
Noise Impact Assessment
14 January 2019
70Q-18-0520-TRP-8550198-1 Commercial-In-Confidence Page 7 of 46
Table 3-2: Measured Maximum Train Noise Levels Recorded between 2:30pm and 2:45pm at Location 3
Measurement Noise Descriptor Measured Noise Level
dB(A)
Attended LAmax
64.7
Unattended 66.0
As expected, the results from the attended and unattended results for that time period generally agree with
each other, with a difference of less than 2dB.
3.2 UNATTENDED MEASUREMENTS
The single event maximum (SEM) LAmax was calculated based on the arithmetic average of maximum levels of
the highest 15 events over the entire noise monitoring period for Location 3 and Location 4. The Location 1
and Location 2 noise data was not used due to the presence of the acoustic barrier. The LAeq,24hr was derived
from the entire noise monitoring period as well and the results are presented in Table 3-3 below.
Table 3-3: Measured Noise Levels for Rail Noise Model Calibration
Monitoring Location LAmax LAeq,24hr
dB(A)
Location 3 75.0 52.8
Location 4 76.1 51.6
4 NOISE CRITERIA
4.1 STATE DEVELOPMENT ASSESSMENT PROVISIONS
The Department of State Development Infrastructure, Local Government and Planning’s “State Development Assessment Provisions” (SDAP) (version 2.1 published on 1st August 2017) has been adopted to assess rail
noise impacts on the development. The development has been assessed according to noise limits for
residences in a transport corridor as it is located adjacent to the Gold Coast line to the west of the
development. Noise limits from the relevant sections of SDAP’s State Code 2 are presented in Table 4-1.
Table 4-1: SDAP State Code 2 Noise Criteria
Performance Outcomes Acceptable Outcomes
Accommodation activities adjacent to a railway or type 2 multimodal corridor
PO24 Development involving an
accommodation activity or land for a future
accommodation activity minimises noise
intrusion from a railway or type 2 multi-
modal corridor in habitable rooms.
AO24.1 A noise barrier or earth mound is provided which is designed, sited
and constructed:
1. To meet the following external noise criteria at all facades of the
building envelope:
a. ≤ 65 dB(A) Leq (24 hour) façade corrected
b. ≤ 87 dB(A) (single event maximum sound pressure level)
façade corrected
2. in accordance with the Civil Engineering Technical Requirement –
CIVIL-SR-014 Design of noise barriers adjacent to railways,
Queensland Rail, 2011.
If the building envelope is unknown, the deemed-to-comply setback distances for
buildings stipulated by the local planning instrument or relevant building regulations
should be used.
In some instances, the design of noise barriers and mounds to achieve the noise
criteria above the ground floor may not be reasonable or practicable. In these
Mirvac Pacific Pty Ltd
Gainsborough Greens – Stage 7.3
Noise Impact Assessment
14 January 2019
70Q-18-0520-TRP-8550198-1 Commercial-In-Confidence Page 8 of 46
Performance Outcomes Acceptable Outcomes
instances, any relaxation of the criteria is at the discretion of the Department of
Transport and Main Roads.
Statutory Note: Noise levels from railways or type 2 multi-modal corridors are to be
measured in accordance with AS1055.1–1997 Acoustics – Description and
measurement of environmental noise.
Habitable rooms of residential buildings located within a transport noise corridor
must comply with the Queensland Development Code MP4.4 Buildings in a
transport noise corridor, Queensland Government, 2010. Transport noise corridors
are mapped on the Department of Infrastructure, Local Government and Planning’s State Planning Policy Interactive Mapping System.
PO25 Development involving an
accommodation activity or land for a future
accommodation activity minimises noise
intrusion from a railway or type 2 multi-
modal corridor in outdoor spaces for passive
recreation.
AO25.1 A noise barrier or earth mound is provided which is designed, sited
and constructed:
1. To meet the following external noise criteria in outdoor spaces for
passive recreation:
a. ≤ 62 dB(A) Leq (24 hour) free field
b. ≤ 84 dB(A) (single event maximum sound pressure level) free
field
2. in accordance with the Civil Engineering Technical Requirement –
CIVIL-SR-014 Design of noise barriers adjacent to railways,
Queensland Rail, 2011..
4.2 QUEENSLAND DEVELOPMENT CODE MP4.4
The Queensland Development Code MP4.4 document specifies external building construction requirements
based on the external rail noise levels to achieve acceptable indoor noise levels. The rail noise level
categories, as specified in Schedule 3 of MP4.4, are given in Table 4-2. The required building construction
acoustic ratings for each noise category are also listed in Table 4-2. The MP4.4 rail noise contour map as per
Queensland’s State Planning Policy is presented in Appendix C.
Table 4-2: MP4.4 Rail Noise Category Levels and Required Building Construction Acoustic Ratings
Noise Category
Single Event Maximum Noise
LAmax (façade corrected)
Required Acoustic Ratings (Rw) Glazing and Frames
External Walls Ceiling and
Roofs
Room Façade
Glazing Area
1.8m2
Room Façade
Glazing
< 1.8m2
Category 4 85dB(A) Rw 43 Rw 43 Rw 52 Rw 45
Category 3 80–84 dB(A) Rw 38 Rw 35 Rw 47 Rw 41
Category 2 75-79 dB(A) Rw 35 Rw 32 Rw 41 Rw 38
Category 1 70-74 dB(A) Rw 27 Rw 24 Rw 35 Rw 35
Category 0 69 dB(A) None None None None
Mirvac Pacific Pty Ltd
Gainsborough Greens – Stage 7.3
Noise Impact Assessment
14 January 2019
70Q-18-0520-TRP-8550198-1 Commercial-In-Confidence Page 9 of 46
5 NOISE IMPACT ASSESSMENT
A noise impact assessment has been conducted using SoundPLAN noise modelling software. The following
are discussed in this section:
Modelling methodology and rail movement data;
Model calibration; and
Predicted rail noise levels and MP4.4 Categories.
5.1 MODELLING METHODOLOGY AND RAIL DATA
Rail noise calculations were carried out using SoundPLAN 7.0 noise modelling software. The data and
assumptions used in rail modelling are presented in Table 5-1.
Table 5-1: Data and Assumptions Used in Rail Noise Modelling
Parameter Data
Future Residence Receiver Heights
Ground Floor: 1.8m above ground level as obtained from terrain data (façade corrected)
Ground Floor: 1.5m above ground level as obtained from terrain data (outdoor spaces for passive recreation)
First Floor: 4.6m above ground level as obtained from terrain data (assuming height of storeys as 2.8m)
Terrain Data Data from Mirvac Pacific Pty Ltd, “BRJD4595-073-135-1-EXT.dwg”, received
11/12/2018
Lot Layout Data from Mirvac Pacific Pty Ltd, “BRJD4595-000-315-290 LOTCALCS-EXT.dwg”,