81 – 101 Mercer Street, Geelong · railway reservation will include external noise impacts on the...

81 – 101 Mercer Street, Geelong

131 | Planning & Consultancy

APPENDIX 5 – ACOUSTIC REPORT

THE PRECINCT

STAGE 2 & 3

MERCER STREET

GEELONG

Town Planning Application

Acoustic Report

Acoustic Report Prepared for:

Morphy-Birrell Property Group Pty Ltd C/- Watson Young Architects Pty Ltd

8 Grattan Street Prahran

Victoria 3181

Ref. 12347-1.1jg 18th July 2019

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TABLE OF CONTENTS

1. Introduction................................................................................................................................................. 3

2. Noise Assessment Terminology ................................................................................................................ 4

3. Measurement Equipment ........................................................................................................................... 4

4. Project Description ..................................................................................................................................... 5

5. Site And Nearby Environment ................................................................................................................... 6

6. Adopted Assessment Criteria .................................................................................................................... 7

External Noise Intrusion Assessment Criteria- Greater Geelong Planning Scheme – Clause 58.04 .................................................................................................................................. 8

6.1.1 Residential Component Of Project ............................................................................................... 8

External Noise Intrusion Assessment Criteria – Australian Standard 2107:2016 ........................... 9

6.2.1 Commercial Component Of Project ............................................................................................. 9

Assessment Criteria – State Environment Protection Policy N-1 .................................................. 10

Assessment Criteria – Residential Noise Regulations ................................................................... 10

Assessment Criteria – State Environment Protection Policy N-2 .................................................. 11

7. Determination Of Relevant Project Design Objectives ............................................................................ 12

Attended And Unattended Noise Monitoring At The Subject Site.................................................. 12

Traffic Noise Intrusion Design Objectives ...................................................................................... 13

7.2.1 Residential Component Of Project ............................................................................................. 13

7.2.2 Commercial Component Of Project ........................................................................................... 13

State Environment Protection Policy N-1 Noise Limits .................................................................. 14

State Environment Protection Policy N-2 Noise Limits .................................................................. 15

8. Consideration Of External Noise Impacts On Subject Site ..................................................................... 16

Traffic/Train Noise Intrusion Within Residential Dwellings Forming Part Of The Proposal ........... 16

Traffic/Train Noise Intrusion Within Commercial Tenancies Forming Part Of The Proposal ........ 18

Noise Control Recommendations ................................................................................................... 19

8.3.1 External Façade Construction .................................................................................................... 19

9. Consideration Of Noise Emissions Associated With Proposed Development ........................................ 21

Commercial Operations Forming Part Of The Proposed Development ........................................ 21

9.1.1 Future Tenancy Operations ........................................................................................................ 21

9.1.2 Commercial Mechanical Services Equipment ............................................................................ 21

9.1.3 Commercial Waste Collection .................................................................................................... 22

Residential Component Of Project ................................................................................................. 23

9.2.1 Residential Mechanical Services Equipment ............................................................................. 23

9.2.2 Domestic Refuse Collection ....................................................................................................... 24

10. Overview .................................................................................................................................................. 25

11. Appendices............................................................................................................................................... 26

Project Drawings (Including Glazing Recommendations) .............................................................. 26

Unattended Noise Monitoring Data ................................................................................................ 33

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1. INTRODUCTION The proposal includes the construction of five multi-level buildings which will form part of a mixed use development at the following addresses: ▪ 14-20 Cavendish Street, Geelong. ▪ 65-67 Mercer Street, Geelong. ▪ 73-77 Mercer Street, Geelong. ▪ 81-101 Mercer Street, Geelong.

The project will be constructed over five stages, and once complete will be described as ‘The Precinct’. As part of the town planning submission for the proposal, Watson Moss Growcott Acoustics (WMG) has been engaged to undertake an acoustic assessment for the proposal. This report addresses the Stage 2 and Stage 3 components of the overall project which are proposed to be constructed at the land described as 81-101 Mercer Street. The land surrounding the subject site includes a combination of residential and commercial uses each of which will require consideration as part of the assessment. In addition, the Mercer Street roadway, Princes Highway roadway and the nearby Port Fairy railway reservation will include external noise impacts on the subject site which will require consideration. This report presents findings of the assessment and provides noise control recommendations to achieve compliance with relevant legislation/guideline documentation where applicable.

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2. NOISE ASSESSMENT TERMINOLOGY

Common terminology used within this noise assessment report is described in Table 1 below.

Table 1: Description of Noise Assessment Terminology

Reference Description

dB(A) Decibels recorded on a sound level meter, which has had its frequency response modified electronically to an international standard, to quantify the average human loudness response to sounds of different character.

Leq

The equivalent continuous level that would have the same total acoustic energy over the measurement period as the actual varying noise level under consideration. It is the noise measure defined by the EPA as the measure of the noise to use in assessing compliance with noise limits.

L90

The level exceeded for 90% of the measurement period, which is representative of the typical lower levels in a varying noise environment. It is the noise measure defined by the EPA as the measure of the background noise level to use in determining noise limits.

L10

Commonly described as the average of the higher levels of a range of noise levels. It is the value of a range of values exceeded for 10% of the observation period, i.e. the level exceeded for 6 minutes for every 60 minutes of observation.

Lmax The highest instantaneous measured ‘A weighted’ noise level during noise measurement.

3. MEASUREMENT EQUIPMENT

As part of the assessment works, WMG has used the equipment described in Table 2 below.

Table 2: Measurement Equipment List

Equipment Designation Use of Equipment

Rion NA27 Precision Sound Level Meter Handheld Noise Measurements

Ngara Real Time Sound Acquisition System Fixed Position Noise Logging Measurements

The field calibration of the measurement equipment was checked with a Bruel & Kjaer Type 4230 Sound Level Calibrator at the commencement and completion of the noise measurements and was found to be within the correct calibration range.

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4. PROJECT DESCRIPTION

The project will include the construction of two independent residential towers with common areas including commercial tenancies at lower levels of each of the towers. The Stage 2 building will be constructed over 25 levels, whilst the Stage 3 building will be constructed over 30 levels including a ‘Skydeck’ retail tenancy on level 30. WMG has been provided with and reviewed Watson Young Architects town planning drawings, in particular TP100-TP114. Based on the drawings provided, Table 3 below presents a summary of each of the levels associated with the Stage 2 & 3 buildings.

Table 3: Summary of Development

Level Description Stage Description

Stage 2 Stage 3

Basement 03 General car parking & services plant room.



Ground Level Retail tenancies, commercial venues, access road to car parking, and residential

dwellings.

Level 01 Commercial offices, car parking,

communal indoor spaces (gym, lounge) and residential dwellings.

Communal indoor space, and residential dwellings.

Level 02 Commercial offices & car parking. Residential dwellings & communal

outdoor area.

Level 03 Commercial offices & car parking. Residential dwellings.

Level 04 – Podium Residential dwellings combined with

communal outdoor terrace area. Residential dwellings combined with

communal outdoor terrace area.

Level 05 to Level 22 Residential dwellings. -

Level 05 to Level 26 - Residential dwellings.

Level 23 to Level 25 Residential dwellings. -

Level 27 to Level 29 - Residential dwellings.

Level 30 (Skydeck) Retail tenancy with associated outdoor

viewing deck & plant platform.

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5. SITE AND NEARBY ENVIRONMENT ‘The Precinct’ project will be constructed at the land with the following addresses: ▪ 14-20 Cavendish Street, Geelong. ▪ 65-67 Mercer Street, Geelong. ▪ 73-77 Mercer Street, Geelong. ▪ 81-101 Mercer Street, Geelong.

The site land is currently occupied by several existing commercial buildings which will be demolished as part of the proposal. The overall site land abuts Mercer Street to the west, Cavendish Street to the east and Malone Street to the north. Generally, the land surrounding the site land includes a combination of commercial and residential premises. The existing Port Fairy railway line and associated Geelong Railway Station are located approximately 90-100 metres to the west of the site. The highly trafficked Princes Highway is located further to the west approximately 180 metres from the site land. An aerial photograph identifying the overall subject site and the Stage 2 and Stage 3 sites under consideration as part of this assessment is shown below in Figure 1.

Subject Site Boundary 178-182 Bridge Rd

Building structures to be maintained as part of

proposal

Figure 1: Aerial Photo of Subject Site and Surrounds

Title Boundary of overall ‘The Precinct’ Project

Proposed Stage 2 and 3 Land

Port Fairy Railway Line

Geelong Train Station

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6. ADOPTED ASSESSMENT CRITERIA

When addressing the potential acoustic issues arising as part of the proposed development, there will be two different issues which require consideration. These include: ▪ External noise sources impacting on the proposed development.

▪ Operational noise emissions caused by the development impacting on premises forming part

of the development and existing off-site premises. Based on previous experience involving similar projects, noise emissions associated with the proposed use, and noise impacts associated with the surrounding environment have been considered in accordance with legislation/guideline documentation as shown below in Table 4 and Table 5.

Table 4: Adopted Noise Impact Assessment Criteria

Noise Source Adopted Assessment Criteria

Traffic Noise & Train Noise Greater Geelong Planning Scheme Clause 58.04 &

Australian Standard 2107:2016

Commercial Noise State Environment Protection Policy (Control of Noise from

Commerce, Industry and Trade) No. N-1.

Table 5: Adopted Noise Emission Assessment Criteria

Noise Source Adopted Assessment Criteria

Commercial Mechanical Services Equipment Noise State Environment Protection Policy (Control of Noise from


Residential Mechanical Services Equipment Noise Residential Noise Regulations.

Commercial Music Noise State Environment Protection Policy

(Control of Music Noise from Public Premises) No. N-2.

Commercial Patron Noise State Environment Protection Policy (Control of Noise from


Each of the above criteria is defined and discussed below.

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EXTERNAL NOISE INTRUSION ASSESSMENT CRITERIA- GREATER GEELONG PLANNING SCHEME –

CLAUSE 58.04

6.1.1 Residential Component of Project

During April 2017 planning schemes throughout Victoria, including Greater Geelong, introduced Clause 58.04-3 which refers to external noise impacts on residential dwellings located within a ‘noise influence area’. Noise influence areas include the following: 1. Areas located within 300 metres of industrial zoned land; 2. Areas located within 300 metres of highly trafficked roadways (greater than 40,000 Annual

average daily traffic volume); 3. Areas located within 80-135 metres of railways. The subject site is located within approximately 180 metres of the existing Princes Highway which includes AADT volumes in the order of 56,000. As a result, the subject site land is considered to be within a ‘noise influence area’. The Planning Scheme requirements associated with Clause 58 – Apartment Developments are documented below:

New dwellings should be designed and constructed to include acoustic attenuation measures to reduce noise levels from off-site noise sources. Buildings within a noise influence area specified in Table B6 should be designed and constructed to achieve the following noise levels:

▪ Not greater than 35 dB(A) for bedrooms, assessed as an LAeq,8h from 10pm to 6am. ▪ Not greater than 40 dB(A) for living areas, assessed as an LAeq,16h from 6am to 10pm.

Buildings, or part of a building screened from a noise source by an existing solid structure or the natural topography of the land, do not need to meet the specified noise level requirements. Noise levels should be assessed in unfurnished rooms with as finished floor and the windows closed.

Prior to the introduction of Clause 58.04-3, WMG along with many other acoustic consulting firms adopted “Australian/New Zealand Standard: Acoustics – Recommended design sound levels and reverberation times for building interiors” (AS2107) as a basis for considering traffic noise intrusion within residential dwellings. For buildings not located with 300 metres of roadways with traffic volumes greater than 40,000 AADT, WMG continue to use AS2107. In the experience of WMG, the introduction of Clause 58.04-3 has resulted in dwellings located nearby to major roadways receiving superior internal amenity relative to those located on roads with lesser vehicle movements. WMG continues to challenge the intent of the clause, however, given that the clause is included within the Planning Scheme, WMG is obliged to assess the subject site in accordance with the requirements of the Clause.

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EXTERNAL NOISE INTRUSION ASSESSMENT CRITERIA – AUSTRALIAN STANDARD 2107:2016

6.2.1 Commercial Component of Project

The Geelong Planning Scheme does not include a noise level criterion for external noise intrusion into commercial use spaces. In consideration of the above, WMG has adopted recommended internal noise levels described with AS2107 as a basis for this assessment. This Australian/New Zealand standard describes recommended noise levels for various areas occupied by people and provides a design sound level range which has been found to be acceptable by most people for the space under consideration.

The Standard notes that ‘when the sound level is greater than the upper level of the range most people occupying the space will become dissatisfied with the level of sound. When the sound level is below the lower level of the range, the inadequacy of background sound to provide masking sound can be problematic.

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ASSESSMENT CRITERIA – STATE ENVIRONMENT PROTECTION POLICY N-1

Commercial premises noise emissions must comply with limits determined according to State Environment Protection Policy (Control of Noise from Commerce, Industry and Trade) No. N-1 (SEPP N-1) when assessed at residential premises. Using SEPP N-1 methodology, the noise limits are calculated values determined using the areas of differing land zoning surrounding the relevant residences as described in Schedule 2 of SEPP N-1. The calculated values are described as the ‘zoning levels’ for the residential receptors. SEPP N-1 also requires consideration of existing ambient background noise levels in the absence of intrusive commercial/industrial noise at relevant residential receptors. When determining the relevant SEPP N-1 noise limits, the calculated zoning levels will apply when the ambient background noise level falls within the range considered ‘neutral’. The ‘neutral’ range represents a background noise level which is considered typical for the surrounding land zoning. Adjusted values will apply where the existing ambient background noise levels are above or below the noise level range deemed neutral. SEPP N-1 noise limits will vary depending on the time of the day, evening or night, with the highest permitted values typically occurring during week daytimes, and lowest during the night period. The relevant EPA-defined day, evening, and night assessment periods are shown below in Table 6.

Table 6: Details of EPA Assessment Periods

EPA Assessment Period Relevant Days Relevant Time Periods

Day Monday to Friday 7:00am to 6:00pm

Saturday 7:00am to 1:00pm

Evening

All Days 6:00pm to 10:00pm

Saturday 1:00pm to 6:00pm

Sunday, Public Holidays 7:00am to 6:00pm

Night All Days 10:00pm to 7:00am

ASSESSMENT CRITERIA – RESIDENTIAL NOISE REGULATIONS

Noise emissions from domestic mechanical plant including air conditioning condensers must comply with the Residential Noise Regulations. These Regulations require that mechanical equipment does not operate during prohibited hours, 10.00pm to 7.00am weekdays or 9.00am weekends and public holidays. However, the intent of the Regulations will be achieved if operation of the domestic mechanical plant during the prohibited hours does not cause audible noise to be heard in nearby residences in habitable rooms with windows open.

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ASSESSMENT CRITERIA – STATE ENVIRONMENT PROTECTION POLICY N-2

Music noise emissions associated with commercial venues must comply with limits determined in accordance with State Environment Protection Policy (Control of Music Noise from Public Premises) No. N-2 (SEPP N-2). SEPP N-2 requires compliance with two noise criteria conditions. These include a daytime/early evening criterion and a late evening/night time criterion. Table 7 below defines for time for the daytime/early evening, and night time periods. A summary of the requirements during each of the relevant periods is shown below in Table 8 and 9.

Table 8: Daytime/Early Evening Assessment Methodology

Daytime/Early Evening

The higher peaks of music noise do not exceed the lower lulls of the ambient noise by more than 5 dB(A), i.e.:

Music dB(A) Leq ≤ Background dB(A) L90 + 5 dB(A)

Table 9: Late Evening/Night Time Assessment Methodology

Late evening/Night Time

The higher peaks of music (measured in octave bands) measured inside or outside a room used for sleeping must not exceed the lulls of the ambient noise (also measured in octave bands) by more than 8 decibels, i.e.:

Music dB L10 (octave 63 - 4 kHz) ≤ Background dB L90 (octave 63 - 4 kHz) + 8 dB

Table 7: SEPP N-2 Assessment Periods

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7. DETERMINATION OF RELEVANT PROJECT DESIGN OBJECTIVES

ATTENDED AND UNATTENDED NOISE MONITORING AT THE SUBJECT SITE

As part of the assessment works for the proposal, WMG has carried out attended and unattended noise monitoring at and around the subject site. The relevant noise monitoring was undertaken during the following dates and times: ▪ Attended site survey between 2:00pm and 4:30pm on Tuesday 11th December 2019. ▪ Unattended monitoring during the period Wednesday 5th to Tuesday 11th December 2019.

The purpose of the noise monitoring was to determine the existing acoustic environment at the site to form a basis in determining the following: ▪ Noise limits in accordance with State and Environment Protection Policy N-1. ▪ Noise limits in accordance with State Environment Protection Policy N-2. ▪ Traffic and train noise impacts at locations representative of the future facades of the

proposed development. An aerial photograph identifying the attended noise measurement locations is shown below in Figure 2.

Noise Monitoring Location 1

Figure 2: Aerial Photograph Identifying Attended and Unattended Noise Monitoring Locations



Attended Location A

Attended Location B

Attended Location C

Attended Location D

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TRAFFIC NOISE INTRUSION DESIGN OBJECTIVES

7.2.1 Residential Component of Project

In accordance with the Greater Geelong Planning Scheme requirements, the design objectives for the proposed residential dwellings forming part of the Stage 2 and Stage 3 works will be as follows:

New dwellings should be designed and constructed to include acoustic attenuation measures to reduce noise levels from off-site noise sources. Buildings within a noise influence area specified in Table B6 should be designed and constructed to achieve the following noise levels:

▪ Not greater than 35 dB(A) for bedrooms, assessed as an LAeq,8h from 10pm to 6am. ▪ Not greater than 40 dB(A) for living areas, assessed as an LAeq,16h from 6am to 10pm.

Buildings, or part of a building screened from a noise source by an existing solid structure or the natural topography of the land, do not need to meet the specified noise level requirements. Noise levels should be assessed in unfurnished rooms with as finished floor and the windows closed.

7.2.2 Commercial Component of Project

The proposal will include a combination of commercial spaces which will occupy the lower levels of the Stage 2 and Stage 3 development. The commercial use spaces will include the following: ▪ Retail tenancies. ▪ Office spaces. ▪ Gymnasium. For each of the described spaces, AS2107 recommends internal noise levels as shown below in Table 10.

Table 10: AS2107 Recommended Internal Noise Levels

Space Description Recommended Design Sound Level Range

Retail Tenancies < 50 dB(A) Leq

Commercial Office Spaces 40-45 dB(A) Leq

Commercial Gymnasium < 50 dB(A) Leq

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STATE ENVIRONMENT PROTECTION POLICY N-1 NOISE LIMITS

In order to determine suitable SEPP N-1 noise limits for the subject site, WMG has considered attended and unattended noise monitoring undertaken at the subject site as described in Section 7.1. In consideration of the above, a summary of the adopted ambient background noise levels, and corresponding SEPP N-1 noise limits for future residential receptors forming part of the proposed development is shown below in Table 11 and Table 12. The described limits will apply for commercial noise sources impacting on and being emitted from the proposed development.

Table 11: Calculated SEPP N-1 External Noise Limits (Western Facades Overlooking Mercer St)

EPA-defined Assessment Period

Adopted Ambient Background Noise Levels

Calculated SEPP N-1 Noise Limits (External)

Adopted Value Relative to Neutral

Range

Day 52 dB(A) L90 Neutral 58 dB(A) Leq

Evening 49 dB(A) L90 Neutral 52 dB(A) Leq

Night 44 dB(A) L90 Neutral 47 dB(A) Leq

Table 12: Calculated SEPP N-1 External Noise Limits

(Eastern Facades Overlooking Cavendish Pl)

EPA-defined Assessment Period

Adopted Ambient Background Noise Levels Calculated SEPP N-1

Noise Limits (External)

Day Adopted SEPP N-1 Neutral Range 57 dB(A) Leq

Evening Adopted SEPP N-1 Neutral Range 51 dB(A) Leq

Night Adopted SEPP N-1 Neutral Range 46 dB(A) Leq

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STATE ENVIRONMENT PROTECTION POLICY N-2 NOISE LIMITS

In order to determine suitable SEPP N-2 noise limits for the subject site, WMG has considered attended and unattended noise monitoring undertaken at the subject site as described in Section 7.1. In consideration of the above, a summary of the adopted ambient background noise levels and corresponding external SEPP N-2 noise limits during the day/early evening, and late evening/night periods are shown below in Table 13, Table 14 and Table 15. The described limits will apply for commercial music noise sources impacting on and being emitted from the proposed development.

Table 13: Calculated SEPP N-2 External Music Noise Limits (Day/Early Evening)

Relevant Facade Day/Early Evening Relevant SEPP N-2 Noise

Limit

Mercer St Facades Adopted ambient background noise level – 49 dB(A) L90 54 dB(A) Leq

Cavendish Pl Facades Adopted ambient background noise level – 46 dB(A) L90 51 dB(A) Leq

Table 14: SEPP N-2 External Music Noise Limits Late Evening/Night Period

(Western Facades Overlooking Mercer St)

Late Evening/Night Time Noise Levels dB Octave Band Centre Frequency, Hz

63 125 250 500 1k 2k 4k

Ambient background noise 50 46 43 42 38 34 25

EPA adjustment to determine SEPP N-2 limits +8 +8 +8 +8 +8 +8 +8

EPA SEPP N-2 Noise Limits (up to 12:00am) 58 54 51 50 46 42 33

Table 15: SEPP N-2 External Music Noise Limits Late Evening/Night Period

(Eastern Facades Overlooking Cavendish Pl)

Late Evening/Night Time Noise Levels dB Octave Band Centre Frequency, Hz

63 125 250 500 1k 2k 4k

Ambient background noise 48 44 40 38 36 31 23

EPA adjustment to determine SEPP N-2 limits +8 +8 +8 +8 +8 +8 +8

EPA SEPP N-2 Noise Limits (up to 12:00am) 56 52 48 46 44 39 31

For internal areas associated with the proposal, WMG has adopted the SEPP N-2 base noise limits as the assessment criteria. The relevant base noise limit values are described below in Table 16.

Table 16: SEPP N-2 Base Noise Limits

Late Evening/Night time Noise Limits:

Noise Levels dB Octave Band Centre Frequency, Hz

63 125 250 500 1k 2k 4k

EPA SEPP N-2 Base Noise Limits 40 30 20 20 15 10 10

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8. CONSIDERATION OF EXTERNAL NOISE IMPACTS ON SUBJECT SITE

TRAFFIC/TRAIN NOISE INTRUSION WITHIN RESIDENTIAL DWELLINGS FORMING PART OF THE

PROPOSAL

The acoustic environment at the future facades of the proposed development include contributions due to the following: ▪ Noise associated with vehicle movements along Mercer Street to the west. ▪ Intermittent noise due to train passby events along the Port Fairy railway line to the west.

Noise due to train passby events were observed to be audible during lulls in traffic noise associated with Mercer Street. Train associated noise sources included the blowing of horns as trains approached and departed the Geelong Station and general train passby events. The highest instantaneous maximum values associated with the described events were measured to be in the order of 65 dB(A) Lmax at locations representative of the future development external facades. In addition to the above, analysis of audio recordings during the early morning periods of Thursday 6th and Tuesday 11th December identified what appear to be freight trains both sitting in idle and passing through the Geelong Station. Noise levels due to the idling and passby events were in the order of 50-55 dB(A) Leq when considered at locations representative of the future development external facades. The described measured train noise level values are of lesser significance than the more constant traffic noise levels associated with Mercer Street. As a result, noise control treatments to reduce external noise intrusion associated with Mercer Street will also reduce noise intrusion associated with railway activity. Train noise impacts have therefore not been considered further. In accordance with the requirements of the Planning Scheme, external noise impacts on the residential component of the project have been considered during the following periods: ▪ 6:00am to 10:00pm. ▪ 10:00pm to 6:00am. Based on analysis of the data collected through site monitoring (as discussed in Section 7.1), the adopted external noise levels at the future facades of the proposed residential dwellings forming part of the development will be as shown below in Table 17. Table 17 also includes the relevant Planning Scheme internal noise level requirements during each assessment period, and the noise reduction performance required by the external facades of the proposed dwellings.

Table 17: Summary of Adopted Noise Levels at Future Facades of Proposed Development Overlooking Mercer St

Assessment Location

Assessment Period Adopted Traffic

Noise Level

Internal Noise Level Design

Objective

Required Noise Reduction


Day Period (6:00am to 10:00pm)

67 dB(A) Leq 40 dB(A) Leq 27 dB(A)

Night Period (10:00pm to 6:00am)


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Assessment Location

Assessment Period Adopted Traffic

Noise Level

Internal Noise Level Design

Objective

Required Noise Reduction











The adopted values include façade reflection. In consideration of the adopted values described in Table 17, external façade treatments will require consideration in order to protect the internal amenity of the future residential dwellings. Specifics regarding external façade glazing and building construction treatments are described in Section 8.3. In addition to the above, it must be noted that the noise levels associated with vehicle movements along Mercer Street will be reduced when considered at the eastern facades of the proposed development due to noise shielding provided by the proposed buildings. The traffic noise levels at these locations will be lesser than those described in Table 17.

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TRAFFIC/TRAIN NOISE INTRUSION WITHIN COMMERCIAL TENANCIES FORMING PART OF THE

PROPOSAL WMG has adopted AS2107 as a basis for considering external noise impacts on the future façades of the commercial tenancies forming part of the proposed development. Based on analysis of the data collected through site monitoring (as discussed in Section 7.1), the adopted external noise levels at the future facades of the commercial tenancies will be as shown below in Table 18 and Table 19. The values are based on the typical operating hours of the commercial tenancies being 8:00am to 6:00pm.

Table 18: Summary of Adopted Noise Levels at Future Facades of Retail Tenancies and Gymnasiums

Assessment Location Adopted Traffic

Noise Level Internal Noise Level

Design Objective Required Noise

Reduction


68 dB(A) Leq < 50 dB(A) Leq 18 dB(A)





Table 19: Summary of Adopted Noise Levels at Future Facades of Commercial Office Spaces

Assessment Location Adopted Traffic

Noise Level Internal Noise Level

Design Objective Required Noise

Reduction


68 dB(A) Leq 40-45 dB(A) Leq 23-28 dB(A)





The adopted values include façade reflection. In consideration of the adopted values described in Table 18 & Table 19, external façade treatments will require consideration in order to protect the internal amenity of the commercial tenancies. Specifics regarding external façade glazing and building construction treatments are described in Section 8.3.

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NOISE CONTROL RECOMMENDATIONS

8.3.1 External Façade Construction

8.3.1.1 External Façade Glazing

The glazed components of the facades will commonly dominate the noise transfer into the building. As a result, the residual noise inside the residences will be controlled by the noise reduction of the glazing system.

In determining the required external façade noise control treatments, the following factors have been considered. ▪ Adopted external noise levels; ▪ Noise increase at the building façade due to building surface noise reflections; ▪ Area of façade glass as a percentage of the overall façade area to habitable rooms; ▪ Use of the habitable rooms.

Based on the measured traffic noise level impacts described in Section 8.1 and 8.2, glazing treatments as described in Table 20 will be recommended for the project.

Table 20: Summary of Glazing Recommendations

Façade Designation Room Designation Recommended Façade Glazing Treatment Weighted Sound

Reduction Index (Rw)

Western Facades Directly Overlooking

Mercer St

Living Room Areas 6mm / 12mm air gap / 10.38mm double glazing (DGU) 34

Bedroom Areas 6mm / 12mm air gap / 10.38mm double glazing (DGU) 34

Office Tenancies 6mm / 12mm air gap / 10mm double glazing (DGU) 33

Retail/Gym Tenancies Standard Building Glazing N/A

Eastern Facades Directly Overlooking

Cavendish Pl

Living Room Areas 6mm / 12mm air gap / 6mm double glazing (DGU) 31

Bedroom Areas 6mm / 12mm air gap / 6mm double glazing (DGU) 31

Office Tenancies Standard Building Glazing N/A


Southern Corner of Site (Mercer St &

Cavendish Pl)

Living Room Areas 6mm / 12mm air gap / 10.76mm double glazing (DGU) 35

Bedroom Areas 6mm / 12mm air gap / 10.76mm double glazing (DGU) 35

Office Tenancies N/A N/A


Northern Facades

Living Room Areas 6mm / 12mm air gap / 6mm double glazing (DGU) 31

Bedroom Areas 6mm / 12mm air gap / 6mm double glazing (DGU) 31

Office Tenancies 6mm / 12mm air gap / 6mm double glazing (DGU) 31


A mark-up of the recommended glazing types is attached in Appendix 11.1. Commercial suppliers of noise rated window or sliding door glazed systems are readily available, such as Australian Aluminium, Capral and G James. Any systems offered to the project should include Australian based noise reduction test data or demonstrate on site to be capable of achieving the required noise reduction performance. The systems and seals installed on the project must be guaranteed to be the same as the tested systems.

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8.3.1.2 External Façade Walls

External facades must be construction to achieve a minimum weighted sound reduction index (Rw) performance of 45. This will likely be achieved by a lightweight steel stud wall construction incorporating 9mm cement sheet externally and 13mm fire rated plasterboard internally. The cavity of the wall construction will include 1 x 75mm x 14kg/m3 fibreglass fibrous insulation. For masonry construction, 150mm precast construction will also be a suitable alternative. The walls must be constructed with no gaps. Any gaps must be sealed using resilient mastic eg: Sikaflex Pro. Alternatives should be reviewed by an acoustic consultant during detailed design if required.

8.3.1.3 Roof/Ceiling Construction

It is understood that generally, the ‘roof/ceiling’ construction of apartment spaces will include a combination of concrete slabs combined with suspended plasterboard ceilings. The described construction will provide sufficient reduction for external noise intrusion within the internal areas forming part of the proposed development. Where light weight ‘roof/ceiling’ sections are proposed, the system will include metal deck roofing combined with suspended 13mm plasterboard ceiling internally. The cavity of the system will include 1 x 75mm x 14kg/m3 fibreglass fibrous insulation. Alternatives should be reviewed by an acoustic consultant during detailed design if required. 8.3.1.4 Consideration of Ventilation

In order to achieve the internal design objective noise level values will require the openable façade glazing sections for all facades to be closed. As a result, ventilation requirements for internal areas forming part of the development will need to be considered in accordance with the Building Code of Australia. This may require borrowed, or fan assisted ventilation.

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9. CONSIDERATION OF NOISE EMISSIONS ASSOCIATED WITH PROPOSED DEVELOPMENT

COMMERCIAL OPERATIONS FORMING PART OF THE PROPOSED DEVELOPMENT

9.1.1 Future Tenancy Operations

The proposal will include a combination of commercial spaces which will occupy the lower levels of the Stage 2 and Stage 3 development. The commercial use spaces will include the following: ▪ Retail tenancies. ▪ Office spaces. ▪ Gymnasium. In addition, it is understood that a retail tenancy will occupy Level 30 of the Stage 3 building. Given the early stages for the project, the future occupiers of each of the tenancies has not been confirmed. As a result, it is recommended that as part of the lease agreement for each of the tenancies, an acoustic consultant is engaged to ensure that compliance with relevant assessment criteria is achieved at residential dwellings forming part of the proposed development and located nearby to the site. Relevant assessment criteria will be as shown below in Table 21.

Table 21: Future Commercial Tenancy Noise Emission Assessment Criteria

Relevant Noise Source Suitable Assessment Criteria

Commercial Mechanical Services Noise Emissions

State Environment Protection Policy (Control of Noise from Commerce, Industry and Trade) No. N-1

Patron Noise Emissions State Environment Protection Policy

(Control of Noise from Commerce, Industry and Trade) No. N-1

Music Noise Emissions State Environment Protection Policy

(Control of Music Noise from Public Premises) No. N-2

9.1.2 Commercial Mechanical Services Equipment

Based on the drawings provided, commercial mechanical services equipment will be located within dedicated plant rooms within the basement levels and above the rooftop level of each of the development towers. Given the early stages of the project, the mechanical services design including the equipment selections have not been confirmed. Noise emissions due to the equipment must comply with noise limits determined in accordance with State Environment Protection Policy (Control of Noise from Commerce, Industry and Trade) No. N-1. During detailed design an acoustic consultant must be engaged to ensure than compliance with the Policy is achieved at residential dwellings forming part of the proposed development and located nearby to the site.

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9.1.2.1 Car Park Ventilation System

Specific noise controls to the car park supply and exhaust fans will include:

▪ CO sniffers in car parks. ▪ Fan speed controls responding to CO sniffer outputs. (Fans on low speed/off during night

time period) ▪ As a minimum allow 3 metres dedicated upstream and downstream acoustically lined duct

and/or acoustic attenuators as required. The design objective will be to achieve SEPP N-1 compliance at nearby residences during any assessment period. 9.1.2.2 Car Park Access Gates

The motor and the operating mechanisms for the guide rails and the door panel supports must be selected to achieve a noise level of 60 dB(A) when measured at 1 metre. The motor and the operating mechanisms for the guide rails and the door panel supports must all be resiliently mounted off the base building structure to minimize structure borne noise transfer into the habitable spaces within the base building. As a minimum, the resilient material must be 9 mm thick, 50 durometer rubber waffle pad with appropriate rubber isolating washers. The proposed details must be submitted to acoustic consultant for review prior to installation.

9.1.3 Commercial Waste Collection

Commercial waste collection at the subject site should be limited in accordance with the guidelines included within Environment Protection Authority Publication 1254 ‘Noise Control Guidelines’. The guidelines regarding commercial/industrial waste collection are as follows: Where a residential area is impacted by noise from the collection of refuse, then collections should be restricted to the times contained within the schedule. The scheduled times are as follows:

One Collection Per Week 6:30am – 8pm Monday to Saturday 9am – 8pm Sunday and public holidays

Two or More Collections Per Week 7am – 8pm Monday to Saturday 9am – 8pm Sunday and public holidays

▪ Refuse bins should be located at sites that provide minimal annoyance to residential

premises. ▪ Compaction should be carried out while the vehicle is moving. ▪ Bottles should not be broken up at collection site. ▪ Routes which service predominantly residential areas should be altered regularly to reduce

early morning disturbances. ▪ Noisy verbal communication between operators should be avoided where possible.

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RESIDENTIAL COMPONENT OF PROJECT

9.2.1 Residential Mechanical Services Equipment

Based on the drawings provided for the project, residential air conditioning equipment will be located throughout the building including: ▪ Within dedicated plant rooms at each floor level. ▪ Externally on outdoor terraces associated with residential dwellings. ▪ Externally on dedicated plant platforms located in common areas, and above the roof of

each of the development towers. Preliminary guidance regarding equipment selections is provided within Section 9.2.1.1 below. During detailed design, an acoustic consultant must be engaged to undertake a detailed review of the proposal to ensure compliance with relevant legislative and guideline criteria. 9.2.1.1 Air Conditioning Heat Rejection Equipment

All of the equipment supplied to the project must be certified by the supplier that the equipment will not generate more noise than that described in the manufacturers' published data. Individual heat rejection condensers for each apartment must not generate more than 59dB(A) under full fan speed when measured at 1metre from the inlet and at 45 degrees from the discharge of the fans and when measured as installed on site. Manufacturer noise data is usually described as “free field” data. To comply with the specified maximum as installed field noise allowance for each condenser the manufacturer value must not be more than 55 dB(A) at 1 metre. Fans must be fitted with inverter speed controllers and have night-time controls which limit unit performance to 70% full output during evenings and night-time. All vibrating equipment and passive devices including pipework attached to vibrating equipment should be supported at least on rubber-in-shear vibration reducing mounts. Mounts should be selected to deflect not less than 3mm under the imposed loads. Any tonal noise emitted from the condensers and audible in a habitable room in an apartment will need to be reduced by the installation of additional manufacturer installed and approved gas pipe attenuator providing at least 10dB attenuation at the gas pulsing frequency.

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9.2.2 Domestic Refuse Collection

Residential waste collection at the subject site should be limited in accordance with the guidelines included within Environment Protection Authority Publication 1254 ‘Noise Control Guidelines’. The guidelines regarding commercial/industrial waste collection are as follows: The main annoyance produced by domestic refuse collections occurs in the early morning (in other words before 7 am). Therefore, if possible, routes should be selected to provide the least impact on residential areas during that time. Collection of refuse should follow the following criteria:

1. Collections occurring once a week should be restricted to the hours 6am – 6pm Monday to

Saturday. 2. Collections occurring more than once a week should be restricted to the hours 7am –6pm

Monday to Saturday. 3. Compaction should be carried out while on the move. 4. Bottles should not be broken up at the point of collection. 5. Routes that service entirely residential areas should be altered regularly to reduce early-

morning disturbances. 6. Noisy verbal communication between operators should be avoided where possible.

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10. OVERVIEW

Watson Moss Growcott Acoustics (WMG) undertaken an acoustic assessment for the proposed mixed-use development to be constructed the land with the following addresses. ▪ 14-20 Cavendish Street, Geelong. ▪ 65-67 Mercer Street, Geelong. ▪ 73-77 Mercer Street, Geelong. ▪ 81-101 Mercer Street, Geelong.

The project will be constructed over five stages. This report addresses the Stage 2 and Stage 3 components of the overall project which are proposed to be constructed at the land described as 81-101 Mercer Street. As part of the assessment, WMG has undertaken the following: ▪ Attended and inspected the subject site and surrounds. ▪ Carried out attended and unattended noise monitoring at the subject site including at

locations representative of the future facades of the proposed development. ▪ Provided suitable assessment criteria relating to external noise impacts, and potential noise

emissions associated with the proposed development. ▪ Developed noise control recommendations and strategies for future use to ensure

compliance with relevant legislation/guideline documentation. Based on the assessment works, WMG has concluded that noise control treatments and strategies must form part of the proposed use to ensure compliance with relevant legislation/guideline documentation. Relevant recommendations and strategies include: ▪ External façade construction treatments to control noise intrusion associated with vehicle

movements along Mercer Street. ▪ Guidelines regarding general refuse collection (Domestic/Industrial). ▪ Residential mechanical services equipment selection guidelines. ▪ Commercial mechanical services equipment guideline noise and vibration control

recommendations. In addition to the above, WMG recommends that for any future commercial tenancies which will occupy the proposed development, the lease agreement must include the requirement for an acoustic consultant to be engaged to ensure that compliance with assessment criteria as is described in Table 21 is achieved at residential premises including both those forming part of the proposed development, and off-site.

JORDAN GROWCOTT WATSON MOSS GROWCOTT acoustics pty ltd

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11. APPENDICES

PROJECT DRAWINGS (INCLUDING GLAZING RECOMMENDATIONS)

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UNATTENDED NOISE MONITORING DATA

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Non-typical ‘Geelong HOG Toy Run’ Event

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