proposed residential subdivision emerald hill brassall ... produced by acoustic works are prepared...

Proposed Residential Subdivision Emerald Hill

Brassall

ACOUSTIC REPORT

Client: Queensland Southern Developments Pty Ltd

Reference: Date Issued: 2016325 R01A Emerald Hill, Brassall RTN 22nd September 2016

2016325 R01A Emerald Hill, Brassall RTN © Acoustic Works 2016

Document Information Contact Details Acoustic Works Unit 2/8 Castlemaine Street Coorparoo QLD 4151 (07) 3393 2222 ABN: 56 157 965 056

PO Box 1271 Coorparoo DC QLD 4101

Greg Pearce Email: [email protected]

Mark Enersen Email: [email protected]

Report Register Date Revision Author Reviewer

22/09/16 R01A Karen McMorrow Greg Pearce

Disclaimer Reports produced by Acoustic Works are prepared for a particular Client’s objective and are based on a specific scope, conditions and limitations, as agreed between Acoustic Works and the Client. Under no circumstances shall information and/or report(s) prepared by Acoustic Works be used by other parties other than the Client without first obtaining written permission from Acoustic Works.


TABLE OF CONTENTS 1.Introduction ..................................................................................................................... 4 2.Site Description................................................................................................................ 4

2.1 Site Location ........................................................................................................... 4 2.2 Proposal ................................................................................................................. 5 2.3 Acoustic Environment .............................................................................................. 5

3.Equipment ........................................................................................................................ 5 4.Noise Monitoring Location............................................................................................... 6

4.1 Unattended Noise Monitoring ................................................................................... 6 5.Measured Noise Levels .................................................................................................... 7

5.1 Road Traffic Noise Levels ......................................................................................... 7 6.Noise Criteria ................................................................................................................... 8

6.1 Road Traffic Noise Criteria ........................................................................................ 8 6.1.1 Queensland Development Code MP4.4............................................................... 8

7.Road Traffic Assessment ................................................................................................. 9 7.1 Traffic Volumes ....................................................................................................... 9 7.2 Road Traffic Noise Verification .................................................................................. 9 7.3 Predicted Road Traffic Noise Levels - 2026 .............................................................. 10

8.Recommendations .........................................................................................................13 8.1 Road Traffic Noise ................................................................................................. 13

8.1.1 Glazing & Noise Category ............................................................................... 13 8.1.2 Alternative Ventilation .................................................................................... 14 8.1.3 Wall Construction .......................................................................................... 15 8.1.4 Roof Construction .......................................................................................... 16 8.1.5 Entry Doors ................................................................................................... 16

9.Conclusion ......................................................................................................................17 10. Appendices ..............................................................................................................18

10.1 Development Plans ................................................................................................ 18 10.2 Noise Monitoring Charts ......................................................................................... 19

TABLE INDEX

Table 1: Measured road traffic noise levels - all time periods ......................................................... 7 Table 2: Queensland Development Code Part MP4.4 Criteria .......................................................... 8 Table 3: Traffic Volumes ............................................................................................................ 9 Table 4: Comparison of Measured and Predicted Noise Levels ........................................................ 9 Table 5: Predicted Road Traffic Noise Impacts ............................................................................10 Table 6: QDC Noise Category & Glazing Treatments ....................................................................13 Table 7: Minimum Wall Treatments ............................................................................................15 Table 8: Minimum Roof Treatments ...........................................................................................16 Table 9: Minimum Entry Door Treatments ..................................................................................16

FIGURE INDEX

Figure 1: Site Location (Not to Scale) .......................................................................................... 4 Figure 2: Noise Monitoring Location ............................................................................................ 6 Figure 3: SoundPLAN verification of noise monitoring location ........................................................ 9 Figure 4: Road Traffic Noise Contours 2026 – Ground Level ..........................................................12 Figure 5: Road Traffic Noise Contours 2026 – First Level ..............................................................12


1. Introduction The following report is in response to a request by Queensland Southern Developments Pty Ltd for a road traffic noise assessment of a proposed subdivision located at Emerald Hill, Brassall. To facilitate the assessment, unattended noise monitoring was conducted for the following locations:

• Road traffic noise levels were assessed in the vicinity of the Warrego Highway and Fernvale Road to establish traffic impacts.

Based on the noise data obtained, the following was assessed:

• Road traffic noise impacting the proposed development.

2. Site Description

2.1 Site Location The site is described by the following:

Lots 268-313, 315-323, 326-335, 350-371 on SP275484

Refer to Figure 1 for site location.

Figure 1: Site Location (Not to Scale)

Stage 13A

Stages 13B, 14A, 14B & 15


A comprehensive site survey was conducted on the 14th September, 2016 and identified the following:

a) The residential subdivision is currently under construction.

b) Areas of bushland bound the site to the north, west and southwest, separating the development from the Warrego Highway and Fernvale Road respectively.

c) An area of parkland is currently under construction adjacent the eastern site boundary, separating the development from a residential subdivision.

d) A residential subdivision bounds the site to the south.

2.2 Proposal The proposal is to construction a residential subdivision as follows:

• Stages 13B, 14A, 14B & 15 shall consist of 87 residential lots ranging in area from 600m2 to 1,256m2.

• Stage 13A, located in the southeast section of the development, has been completed and therefore shall not be included in the assessment.

• The assessment considers both single and two storey dwellings. • Site access is via Heritage Drive to the southeast.

Refer to the Appendices for development plans.

2.3 Acoustic Environment The development site is primarily affected by road traffic noise from the Warrego Highway with Fernvale Road potentially impacting the site.

3. Equipment The following equipment was used to record noise levels:

• EL 316 Environmental Noise Monitor • BSWA Technology Co. Ltd Sound Calibrator

The EL 316 Environmental Noise Monitor holds current NATA Laboratory Certification and was field calibrated before and after the monitoring period, with no significant drift from the reference signal recorded.


4. Noise Monitoring Location

4.1 Unattended Noise Monitoring An EL316 environmental noise monitor was placed 11m from the nearest lane of the Warrego Highway to measure road traffic noise levels. The monitor was located in a free field position with the microphone approximately 1.4 metres above ground surface level. The noise monitor was set to record noise levels between the 12th and 19th September 2016. The environmental noise monitor was set to record noise levels in "A" Weighting, Fast response using 15 minute statistical intervals. Road traffic noise measurements were conducted in accordance with Australian Standard AS2702:1984 ‘Acoustics - Methods for the measurement of road traffic noise’. Refer to Figure 2 for noise monitoring location.

Figure 2: Noise Monitoring Location

N Noise Monitor

Stages 13B, 14A, 14B & 15


5. Measured Noise Levels The following table presents the measured ambient noise levels from the unattended noise monitoring survey. Any periods of inclement weather or extraneous noise was omitted from the measured data prior to determining the results.

5.1 Road Traffic Noise Levels The ambient noise levels measured at the monitoring location are as follows;

Table 1: Measured road traffic noise levels - all time periods

Day Date L10 (18h)

Leq (24h)

L90 (8h)

L90 (18h)

Tuesday 13/09/16 73 71 49 60 Wednesday 14/09/16 73 71 49 60 Thursday 15/09/16 75 72 50 63

Friday 16/09/16 74 72 51 63 Overall value 74 71 50 61

Road traffic data from the weekend was not utilised as it is not considered relevant to the assessment. Refer to the appendix for graphical representation.


6. Noise Criteria

6.1 Road Traffic Noise Criteria As the development is located near state controlled roads (Warrego Highway and Fernvale Road), the SDAP criteria detailed in Section 6.1.1 applies.

6.1.1 Queensland Development Code MP4.4

To determine the minimum design requirements for any new buildings located in SDAP transport corridor, the Queensland Development Code Part MP4.4 may be applied if no alternative solutions are provided. In accordance with MP4.4 the noise categories are stated in Table 2.

Table 2: Queensland Development Code Part MP4.4 Criteria

Internal Criteria – Queensland Development Code Part 4.4 Category L10(18h) dB(A)

4 > 73

3 68-72

2 63-67

1 58-62

0 < 57

The building treatment for any future development onsite shall be determined at Building Approval stage, in general accordance with the Queensland Development Code. Alternative solution may be provided on request.


7. Road Traffic Assessment Road traffic noise associated with the Warrego Highway and Fernvale Road for the ten year planning horizon was assessed at the development to determine compliance with SDAP assessment criteria (refer to Section 6.1) and any requirements for acoustic treatments.

7.1 Traffic Volumes Traffic data for the Warrego Highway and Fernvale Road was obtained from the Queensland Government Traffic Census with an annual growth rate of 3% applied.

Table 3: Traffic Volumes

Location 2015 AADT

2016 Predicted AADT

2026 Predicted AADT

Percentage of Heavy Vehicles

Warrego Highway 42,055 42,566 57,205 14.3%

Fernvale Road 11,454 11,798 15,855 4%

7.2 Road Traffic Noise Verification To ensure the CoRTN noise model is accurate, a verification model of the predicted LA10(18hr) was created and compared to the measured noise level based on the data provided in Section 7.1. The CoRTN method allows a 2dB(A) variation from the predicted and measured level, if the variation exceeds 2dB(A) a correction to the predicted level is required.

Table 4: Comparison of Measured and Predicted Noise Levels

Location Measured LA10(18hr) dB(A)

Predicted LA10(18hr) dB(A) Correction

Warrego Highway 73.9 74.8 0

Figure 3: SoundPLAN verification of noise monitoring location


7.3 Predicted Road Traffic Noise Levels - 2026 Road traffic noise modelling for the proposed development was based on the following information:

• Site layout provided by Lennium Group. • Warrego Highway speed limits of 80km/h and 100km/h. • Fernvale Road speed limits of 60km/h and 80km/h. • Receiver heights were based on 1.5m above finished floor level. • All predicted levels include façade correction.

The 3D SoundPLAN Cortn noise model predicted LA10,18hour levels with Table 5 presenting the predicted road traffic noise impacts for development. Figure 4 and Figure 5 show the predicted road traffic noise contours for the development.

Table 5: Predicted Road Traffic Noise Impacts

Location Predicted Noise Impacts 2026

Lot Level LA10(18h) dB(A) QDC

Category 268 Ground 65 2

First 67 2 269 Ground 66 2









First 62 1 278-283 Ground 63 2


First 64 2 285-292 Ground 59 1

First 60 1 293-296 Ground 57 0



First 64 2


Location Predicted Noise Impacts 2026

Lot Level LA10(18h) dB(A) QDC

Category 299 Ground 60 1

First 62 1 300-301 Ground 57 0

First 59 1 302-307 Ground ≤57 0

First ≤57 0 308 Ground 57 0







First 62 1 316-317 Ground 57 0

First 59 1 318-334 Ground ≤57 0

First ≤57 0 335 Ground 59 1


First 59 1 351-371 Ground ≤57 0

First ≤57 0

Based on the predicted noise impacts, additional treatments are required to ensure compliance for with SDAP assessment requirements. Refer to Section 8 for recommendations.


Figure 4: Road Traffic Noise Contours 2026 – Ground Level

Figure 5: Road Traffic Noise Contours 2026 – First Level


8. Recommendations

8.1 Road Traffic Noise All building treatments for residential units shall be determined at the Building Approval stage in accordance with the assessment requirements of the Queensland Development Code Part MP4.4. For reference, preliminary noise categories are nominated in Table 6.

8.1.1 Glazing & Noise Category

Calculations were conducted in accordance with Queensland Development Code Part MP4.4 to ensure compliance with the QDC. The results, including glazing treatments and the noise category, are presented in the Table 6.

Table 6: QDC Noise Category & Glazing Treatments

Unit Level

QDC Category

QDC Rw Ratings QDC Glazing

Acou

stic

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ls

Wal

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Roo

f

Gla

zing

Entr

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or

Floo

rs

Gla

zing

*

268 Ground 2 41 38 35 33 - 10.38lam yes

First 2 41 38 35 - - 10.38lam yes

269 Ground 2 41 38 35 33 - 10.38lam yes

First 3 47 41 38 33 - 12.5 Vlam or 13.52 lam or 14.38 lam yes

270 Ground 2 41 38 35 33 - 10.38lam yes


271 Ground 2 41 38 35 33 - 10.38lam yes


272 Ground 2 41 38 35 33 - 10.38lam yes


273 Ground 2 41 38 35 33 - 10.38lam yes


274 Ground 2 41 38 35 33 - 10.38lam yes


275 Ground 2 41 38 35 33 - 10.38lam yes

First 2 41 38 35 - - 10.38lam yes

276 Ground 2 41 38 35 33 - 10.38lam yes

First 2 41 38 35 - - 10.38lam yes

277 Ground 1 35 35 27 28 - 4mm float yes First 1 35 35 27 - - 4mm float yes

278-283 Ground 2 41 38 35 33 - 10.38lam yes

First 2 41 38 35 - - 10.38lam yes

284 Ground 1 35 35 27 28 - 4mm float yes

First 2 41 38 35 - - 10.38lam yes

285-292 Ground 1 35 35 27 28 - 4mm float yes

First 1 35 35 27 - - 4mm float yes 293-296 Ground 0 - - - - - 4mm float no

First 1 35 35 27 - - 4mm float yes

297 Ground 2 41 38 35 33 - 10.38lam yes

First 2 41 38 35 - - 10.38lam yes


First 2 41 38 35 - - 10.38lam yes


300-301 Ground 0 - - - - - 4mm float no



Unit Level

QDC Category

QDC Rw Ratings QDC Glazing

Acou

stic

sea

ls

Wal

l

Roo

f

Gla

zing

Entr

y do

or

Floo

rs

Gla

zing

*

302-307 Ground 0 - - - - - 4mm float no

First 0 - - - - - 4mm float no 308 Ground 0 - - - - - 4mm float no

First 1 35 35 27 - - 4mm float yes 309 Ground 1 35 35 27 28 - 4mm float yes





First 2 41 38 35 - - 10.38lam yes

313 Ground 2 41 38 35 33 - 10.38lam yes

First 2 41 38 35 - - 10.38lam yes


316-317 Ground 0 - - - - - 4mm float no First 1 35 35 27 - - 4mm float yes

318-334 Ground 0 - - - - - 4mm float no First 0 - - - - - 4mm float no


First 1 35 35 27 - - 4mm float yes 350 Ground 1 35 35 27 28 - 4mm float yes

First 1 35 35 27 - - 4mm float yes 351-371 Ground 0 - - - - - 4mm float no

First 0 - - - - - 4mm float no *If the total glazing area of a habitable room (living areas/bedrooms) is less than 1.8m2, glazing with minimum Rw 24 (4mm float with standard weather seals) can be used for QDC Noise Category 1, glazing with minimum Rw 32 (6.38mm laminated glass with acoustic seals) can be used for Noise Category 2, and glazing with minimum Rw 35 (10.38mm laminate glass with acoustic seals) can be used for Noise Category 3. Any locations not identified in Table 6 are nominated as QDC Noise Category 0 and require standard construction for road traffic noise. The minimum glazing treatments presented in Table 6 are required to comply with the following:

• The minimum glass thickness specified shall not be reduced regardless of the Rw performance of the glazing system.

• If compliance cannot be achieved with the minimum Rw ratings, the glass thickness shall be increased until compliance is achieved.

• Glazing specified with acoustic seals requires a Q-lon seal or an equivalent product, mohair seals are not acceptable.

• The glazier shall provide NATA test reports on request to verify compliance with the minimum Rw ratings. Generic reports are not acceptable.

8.1.2 Alternative Ventilation

To achieve the required internal noise levels for the development, all locations nominated in Table 6 as QDC Noise Category 1-3 will require the provision for an alternative ventilation system similar to air-conditioning or mechanical ventilation to allow windows to be closed.


8.1.3 Wall Construction

The QDC wall construction requirements are detailed in the table below with the QDC Noise Categories nominated in Table 6:

Table 7: Minimum Wall Treatments

QDC Noise

Category

Wall Rw

Minimum Wall Treatments

3 47

Two leaves of clay brick masonry at least 110mm thick with: (i) cavity not less than 50mm between leaves; and (ii) 50mm thick mineral insulation or 50mm thick glass wool insulation with a density of 11kg/m3 or 50mm thick polyester insulation with a density of 20kg/m3 in the cavity. OR Two leaves of clay brick masonry at least 110mm thick with: (i) cavity not less than 50mm between leaves; and (ii) at least 13mm thick cement render on each face. OR Single leaf of clay brick masonry at least 110mm thick with: (i) a row of at least 70mm x 35mm timber studs or 64mm steel studs at 600mm centres, spaced at least 20mm from the masonry wall; and (ii) mineral insulation or glass wool insulation at least 50mm thick with a density of at least 11kg/m3 positioned between studs; and (iii) One layer of plasterboard at least 13mm thick fixed to outside face of studs. OR Single leaf of minimum 150mm thick masonry of hollow, dense concrete blocks, with mortar joints laid to prevent moisture bridging. OR 1 layer of 9mm FC externally with 92mm steel stud and 70mm glasswool batts (14kg/m3) in the cavity with 2 layers of 13mm plasterboard internally on a resilient mount. OR 1 layer of 9mm FC externally with 90mm Head and Foot, 70mm staggered studs and 75mm glasswool batts (14kg/m3) in the cavity with 1 layer of 13mm plasterboard internally.

2 41

Two leaves of clay brick masonry at least 110mm thick with cavity not less than 50mm between leaves OR Single leaf of clay brick masonry at least 110mm thick with: (i) a row of at least 70mm x 35mm timber studs or 64mm steel studs at 600mm centres, spaced at least 20mm from the masonry wall; and (ii) mineral insulation or glass wool insulation at least 50mm thick with a density of at least 11kg/m3 positioned between studs; and (iii) One layer of plasterboard at least 10mm thick fixed to outside face of studs OR Single leaf of brick masonry at least 110mm thick with at least 13mm thick render on each face OR Concrete brickwork at least 110mm thick OR 1 layer of 9mm FC externally, 90mm timber stud with 75mm glasswool batts (14kg/m3) in cavity, 13mm plasterboard internally.

1 35

Single leaf of clay brick masonry at least 110mm thick with: (i) a row of at least 70mm x 35mm timber studs or 64mm steel studs at 600mm centres, spaced at least 20mm from the masonry wall; and (ii) One layer of plasterboard at least 10mm thick fixed to outside face of studs OR Minimum 6mm thick fibre cement sheeting or weatherboards or plank cladding externally, minimum 90mm deep timber stud or 92mm metal stud, standard plasterboard at least 13mm thick internally. OR Minimum 6mm thick fibre cement sheeting or weatherboards or plank cladding externally, minimum 70mm deep timber stud with 70mm glasswool batts (10kg/m3) in cavity, standard plasterboard at least 13mm thick internally.


QDC Noise

Category

Wall Rw

Minimum Wall Treatments

0 N/A Standard Construction

8.1.4 Roof Construction

The QDC ceiling construction requirements are detailed in the table below with the QDC Noise Categories nominated in Table 6:

Table 8: Minimum Roof Treatments

QDC Noise

Category Roof Rw Minimum Roof Treatments

3 41

Concrete or terracotta tile or metal sheet roof with sarking, plasterboard ceiling at least 10mm thick fixed to ceiling joists, glass wool insulation at least 50mm thick with a density of at least 11kg/m3 or polyester insulation at least 50mm thick with a density of at least 20kg/m3 in the cavity. OR Concrete suspended slab at least 100mm thick.

2 38

Concrete or terracotta tile or metal sheet roof with sarking, plasterboard ceiling at least 10mm thick fixed to ceiling cavity, mineral insulation or glass wool insulation at least 50mm thick with a density of at least 11kg/m3.

1 35 Concrete or terracotta tile or metal sheet roof with sarking, plasterboard ceiling at least 10mm thick fixed to ceiling cavity.


8.1.5 Entry Doors

The QDC entry door requirements are detailed in the table below.

Table 9: Minimum Entry Door Treatments

QDC Noise Category Door Rw Minimum Entry Door Treatments

2/3 33

Fixed so as to overlap the frame or rebate of the frame by not less than 10mm, fitted with the full perimeter acoustically rated seals and constructed of – (i) solid core, wood, particleboard or blockboard not less than 45mm thick; and/or (ii) acoustically laminated glass not less than 10.38mm thick.

1 28

Fixed so as to overlap the frame or rebate of the frame, constructed of – (i) wood, particleboard or blockboard not less than 33mm thick; or (ii) compressed fibre reinforced sheeting not less than 9mm thick; or (iii) other suitable material with a mass per unit area not less than 24.4kg/m2; or (iv) solid core timber door not less than 35mm thick fitted with full perimeter acoustically rated seals.



9. Conclusion A road traffic noise assessment was conducted for the proposed subdivision located at Emerald Hill, Brassall which considered the following:

• Warrego Highway and the Fernvale Road for road traffic noise. On the condition the recommendations as detailed in Section 8 are implemented, general compliance is predicted with SDAP assessment criteria. If you should have any queries please do not hesitate to contact us. Report Prepared By

KAREN MCMORROW B.A.I Acoustic Consultant


10. Appendices

10.1 Development Plans


10.2 Noise Monitoring Charts

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