hardi aged care, seven hills - stage 1 · hardi aged care development to be located at 1 crews...

SYDNEY A: 9 Sarah St MASCOT 2020 T: (02) 8339 8000

SYDNEY MELBOURNE BRISBANE CANBERRA LONDON DUBAI SINGAPORE GREECE

ABN: 11 068 954 343

The information in this document is the property of Acoustic Logic Consultancy Pty Ltd ABN 11 068 954 343 and shall be returned on demand. It is issued on the condition that, except with our written permission, it must not be reproduced, copied or communicated to any other party nor be used for any purpose other than that stated in particular enquiry, order or contract with which it is issued.

I:\Jobs\2018\20180957\20180957.1\20180926TAA_R3_Noise Impact Assessment.docx 1

DIRECTORS MATTHEW PALAVIDIS VICTOR FATTORETTO MATTHEW SHIELDS

MANAGING DIRECTORS

MATTHEW PALAVIDIS

VICTOR FATTORETTO

GENERAL MANAGER

MATTHEW SHIELDS

Hardi Aged Care, Seven Hills - Stage 1

Noise Impact Assessment


DOCUMENT CONTROL REGISTER

Project Number 20180957.1

Project Name Hardi Aged Care, Seven Hills - Stage 1

Document Title Noise Impact Assessment

Document Reference 20180957.1/2609A/R3/TA

Issue Type Email

Attention To FDC Construction & Fitout (NSW) Pty Ltd Paul Ha

Revision Date Document Reference Prepared By

Checked By

Approved By

0 3/08/2018 20180957.1/0308A/R0/TA TA TA

1 9/08/2018 20180957.1/0908A/R1/TA TA TA

2 9/08/2018 20180957.1/0908A/R2/TA TA TA

3 26/09/2018 20180957.1/2609A/R3/TA TA TA


TABLE OF CONTENTS

1 INTRODUCTION 4 2 SITE DESCRIPTION AND PROPOSED DEVELOPMENT 5 3 NOISE DESCRIPTORS 7 4 TRAFFIC NOISE INTRUSION ASSESSMENT 8

4.1 ACOUSTIC CRITERIA 8 4.2 TRAFFIC NOISE MEASUREMENTS 8 4.3 EVALUATION OF NOISE INTRUSION 9

4.3.1 Recommended Glazing 9 4.3.2 External Doors 10 4.3.3 External Walls 10 4.3.4 Roof 10

5 NOISE EMISSION ASSESSMENT 12 5.1 NOISE EMISSION OBJECTIVES 12

5.1.1 Blacktown Council DCP 12 5.2 EPA - NOISE POLICY FOR INDUSTRY (NPfI) 12

5.2.1 NPfI - Intrusiveness Noise Goals 12 5.2.2 NPfI – Project Amenity Goals 13

5.3 SLEEP AROUSAL ASSESSMENT 13 5.4 ASSESSMENT OF NOISE EMISSIONS 15

5.4.1 Mechanical plant 15 6 CONCLUSION 16


1 INTRODUCTION

This report presents our assessment of the acoustic and vibration impacts on the proposed Stage 1 Hardi Aged Care development to be located at 1 Crews Road, Seven Hills.

This report will:

• Conduct an external noise impact assessment (primarily traffic noise) and recommend acoustic treatments to ensure that the comfort of future residents is satisfactory.

• Establish noise goals for noise emissions (services plant) from the development.

This assessment has been based on architectural drawings dated 12 September 2018 by WMK Architects.


2 SITE DESCRIPTION AND PROPOSED DEVELOPMENT

The proposed development consists of multiple buildings with Residential Aged Care Facilities (RACF).

The southern boundaries of the Stage 1 RACF buildings are bound by existing aged care development (assisted living units and independent living units). To the north of the site is Solander Road which carries medium to low volumes of traffic. To the east of the site is Crews Road which carries low volumes of traffic.

Figure 1 presents the site and locations of noise monitoring.

Figure 1 – Site Map

Existing Hardi Aged Care

Unattended Monitor Position

Thomas Street

Solander Road

Legend

Unattended Monitor

Existing Development

Attended Monitoring Position

Crews Road

3 NOISE DESCRIPTORS

Traffic noise constantly varies in level, due to fluctuations in traffic speed, vehicle types, road conditions and traffic densities. Accordingly, it is not possible to accurately determine prevailing traffic noise conditions by measuring a single, instantaneous noise level. To accurately determine the effects of traffic noise a 15-20 minute measurement interval is utilised. Over this period, noise levels are monitored on a continuous basis and statistical and integrating techniques are used to determine noise description parameters. These parameters are used to measure how much annoyance would be caused by a particular noise source.

In the case of environmental noise three principle measurement parameters are used, namely L10, L90 and Leq.

The L10 and L90 measurement parameters are statistical levels that represent the average maximum and average minimum noise levels respectively, over the measurement intervals. The L10 parameter is commonly used to measure noise produced by a particular intrusive noise source since it represents the average of the loudest noise levels produced at the source.

Conversely, the L90 level (which is commonly referred to as the background noise level) represents the noise level heard in the quieter periods during a measurement interval. The L90 parameter is used to set the allowable noise level for new, potentially intrusive noise sources since the disturbance caused by the new source will depend on how audible it is above the pre-existing noise environment, particularly during quiet periods, as represented by the L90 level.

The Leq parameter represents the average noise energy during a measurement period. This parameter is derived by integrating the noise levels measured over the measurement period. Leq is important in the assessment of traffic noise impact as it closely corresponds with human perception of a changing noise environment; like traffic noise.


4 TRAFFIC NOISE INTRUSION ASSESSMENT

This section of the report details the acoustic assessment of traffic noise intrusion to the proposed development.

4.1 ACOUSTIC CRITERIA

The determination of an acceptable level of traffic noise within the residential spaces requires consideration of the activities carried out within the space and the degree to which noise will interfere with those activities

As sleep is the activity most affected by traffic noise, bedrooms are the most sensitive rooms. Higher levels of noise are acceptable in living areas without interfering with activities such as reading, listening to television, etc. Noise levels in utility spaces such as kitchens, bathrooms, laundries, etc can be higher.

Assessment shall be conducted in accordance with Australian Standards AS2107-2016 “Acoustics - Recommended Design Sound Levels and Reverberation Times for Building Interiors” as well as AS367 “Acoustics – Road Traffic Noise Intrusion – Building, Siting and Construction”

AS2107-2016 recommends maximum design sound levels for different areas of occupancy in the residential development while AS 3671 “Road Traffic Noise Intrusion - Building Siting and Construction” recommends that an appropriate Leq dB(A) or L10 dB(A) traffic noise descriptor be used for the occupancy being assessed. On this basis an appropriate descriptor for bedrooms is the Leq between 10pm and 7am (known as Leq(9hr)). This is taken as being the normal sleep period. For living rooms the Leq measured between 7am and 10pm is appropriate (this is known as Leq(15hr)).

Based on AS2107-2016 and AS3671 the following assessment criteria would apply to the proposed development.

Table 1 - Traffic Noise Criteria for All Spaces within the Development

SPACE/ACTIVITY TYPE NOISE LEVEL

Bedrooms 35 dB(A) Leq,(9hr)

Living Areas 45 dB(A) Leq,(15hr)

4.2 TRAFFIC NOISE MEASUREMENTS

External noise levels in the area have been recorded by this office using long term unattended noise monitoring equipment and attended short-term attended measurements.

Attended measurements of peak hour traffic noise were conducted Crews Road and Solander Road on 31 July 2018. Attended noise measurements were conducted using a Norsonic 140 Sound Analyser. The analyser was set to fast response and calibrated before and after the measurements using a Rion NC-73 calibrator. No significant drift was noted.

Unattended traffic noise monitoring within the Hardi Aged Care site and has been utilised with the attended measurements.


Long term monitoring was conducted using an Acoustic Research Laboratories noise monitor set to A-weighted fast response. The monitor was place on site between 26 and 31 July. The monitor was calibrated at the start and end of the monitoring period using a Rion NC-73 calibrator. No significant drift was noted.

The traffic noise levels listed in the table below, were determined based on the logging data and attended measurements. In determination of acoustic treatments, the measured level is adjusted for distance and orientation.

Table 2 – Traffic Noise Measurements

Location Time of Day Measured Noise Level

dB(A)Leq(9/15 hour)

Stage 1 Facade Night – time (22:00 – 7:00) 53dB(A) 9 hour

Daytime(7:00 – 22:00) 60dB(A) 15 hour

4.3 EVALUATION OF NOISE INTRUSION

Internal noise levels will primarily be as a result of noise transfer through the windows and doors and roof, as these are relatively light building elements that offer less resistance to the transmission of sound. All external walls are proposed to be heavy masonry elements that will not require upgrading.

The predicted noise levels through the windows, doors and roof are discussed below. The predicted noise levels have been based on the measured level and spectral characteristics of the external noise, the area of building elements exposed to traffic noise, the absorption characteristics of the rooms and the noise reduction performance of the building elements.

Calculations were performed taking into account the orientation of windows, barrier effects (where applicable), the total area of glazing, facade transmission loss and the likely room sound absorption characteristics. In this way the likely interior noise levels can be predicted.

In all cases, the selected glazing type (refer below) reduces internal noise levels to within the nominated criteria for the various space types.

4.3.1 Recommended Glazing

The following tables list the recommended glazing assemblies for this project to achieve the internal traffic noise requirements. All external windows and doors listed are required to be fitted with Q-lon type acoustic seals. (Mohair Seals are unacceptable).

The glazing thicknesses recommended are those needed to satisfy acoustic requirements and do not take into account other requirements such as structural, safety or other considerations. These additional considerations may require the glazing thickness to be increased beyond the acoustic requirement.


Table 3 – Glazing Requirements –Residential Units

Building Room Facade Glazing requirements Acoustic

Seals

All All All 6mm glass Yes

In addition to meeting the minimum glazing thickness requirements given, the design of the window mullions, perimeter seals and the installation of the windows/doors in the building openings shall not reduce the STC rating of the glazing assembly below the values nominated in the table above. Note that mohair type seals will not be acceptable for the windows requiring acoustic seals.

The window/door suppliers should provide evidence that the systems proposed have been tested in a registered laboratory with the recommended glass thicknesses and comply with the minimum listed STC requirements. Also, the glazing installer should certify that the window/doors have been constructed and installed in a manner equivalent to the tested samples.

Table 4 – Minimum STC For Glazed Assembly (With Acoustic Seals)

Glazing Assembly Minimum STC of Installed Window

6mm 29

Note that mohair or mohair/fin seals in openable windows and doors are not acceptable where acoustic seals are required. Seals in these instances shall be equal to Schlegel Q-lon bulb type seals.

4.3.2 External Doors

Any glass door should be constructed using glazing thickness set out in Table 3. Full perimeter acoustic seals around the doors are required. It will be acoustically acceptable if thicker glazing is required for structural or comfort purposes, the glazing recommended in Table 4 is a minimum requirement.

4.3.3 External Walls

Any external walls proposed to be constructed from concrete or masonry elements will not require upgrading to achieve internal noise level goals.

For lightweight external walls, the following construction is required:

• Timber or metal cladding / min 9mm FC sheet / min 90mm cavity with 75mm thick 11kg/m3 glass wool / 13mm plasterboard.

4.3.4 Roof

Any concrete roofing will not require upgrading to achieve acoustic requirements.

In the areas where metal deck roofing is proposed, the following construction is required:


• 0.56mm Colorbond / min 300mm cavity with 75mm thick 11kg/m3 glass wool / 13mm plasterboard.


5 NOISE EMISSION ASSESSMENT

Noise emissions from the site should be assessed to ensure that the amenity of nearby land users is not adversely affected.

Noise generated by mechanical plant servicing the development has been identified as the only potential source of noise emissions from the Stage 1 site.

5.1 NOISE EMISSION OBJECTIVES

The following documents were used to determine the project criteria for noise emissions:

• NSW EPA Noise Policy for Industry

• Blacktown DCP.

5.1.1 Blacktown Council DCP

Section 6.9.3 of the Blacktown DCP 2015 requires that:

No electrical, mechanical or hydraulic plant or equipment shall generate a noise level greater than 5dB(A) above the ambient L90 sound level at the boundaries of any allotment at any time of day.

This is consistent with, EPA noise emission controls are recommended, as detailed below.

5.2 EPA - NOISE POLICY FOR INDUSTRY (NPfI)

Noise sources covered by this code include mechanical services noise (the identified potential noise emission source from the site). Both the Intrusiveness and the Project Amenity criteria (as set out below) must be complied with.

5.2.1 NPfI - Intrusiveness Noise Goals

Intrusiveness criteria permit noise generation to be no more than 5dB(A) above existing background noise levels. The criteria are as follows:


Table 5 - EPA Intrusiveness Criteria

Location Time of Day Background noise Level - dB(A)L90

Intrusiveness Noise Objective

dB(A)Leq(15min) (Background + 5dB)

Residences Surrounding the Site

Day Time (7am - 6pm) 41 46

Evening (6pm - 10pm) 39 44

Night (10pm - 7am) 36 41

5.2.2 NPfI – Project Amenity Goals

Project amenity criteria are determined based on the land use in the area (residential/commercial/industrial). The residential land use is then further categorised into rural, sub-urban and urban areas. For the purpose of this assessment the existing residential dwellings will be considered suburban.

Table 6 -EPA Project Amenity Criteria

Noise Receiver Amenity Noise Level – dB(A)LAeq(15min)

Daytime Evening Night

Existing Residential (Suburban)

53 43 38

5.3 SLEEP AROUSAL ASSESSMENT

Potential sleep arousal impacts should be considered for noise generated after 10pm.

Sleep arousal is a function of both the noise level and the duration of the noise.

As recommended in the NPfI, to assess potential sleep arousal impacts, a two-stage test is carried out:

• Step 1 – Section 2.5 Maximum noise level event assessment from the NPfI states the following:

Where the subject development/premises night-time noise levels at a residential location exceed:

o LAeq,15min 40dB(A) or the prevailing RBL plus 5 dB, whichever is the greater, and/or

o LAFmax 52 dB(A) or the prevailing RBL plus 15 dB, whichever is greater,

a detailed maximum noise level event assessment should be undertaken.

Based on the above the following noise objectives apply:


Table 7– Sleep Arousal Criteria (Maximum/LMax Noise Events)

Location Rating Background

Level dB(A)L90

Rating Background Level + 15dB(A)

Governing Criteria dB(A)L(Max)

Hardi Site 36 51 52

• Step 2 - If there are noise events that could exceed the average/maximum criteria detailed in the tables above, then an assessment of sleep arousal impact is required to be carried out taking into account the level and frequency of noise events during the night, existing noise sources, etc. This test takes into account the noise level and number of occurrences of each event with the potential to create a noise disturbance. As is recommended in the explanatory notes of the EPA Industrial Noise Policy, this more detailed sleep arousal test is conducted using the guidelines in the EPA Road Noise Policy. Most relevantly, the Road Noise Policy states:

For the research on sleep disturbance to date it can be concluded that:

o Maximum internal noise levels below 50-55dB(A) are unlikely to awaken people from sleep.

o One to two noise events per night with maximum internal noise levels of 65-70dB(A) are not likely to affect health and wellbeing significantly.


5.4 ASSESSMENT OF NOISE EMISSIONS

5.4.1 Mechanical plant

Detailed review of all external mechanical plant should be undertaken at construction certificate stage (once plant selections and locations are finalised). Acoustic treatments should be determined in order to control plant noise emissions to the levels set out in section 5 of this report.

While compliance with noise emission requirements will be achievable with appropriate acoustic treatment, it is highly likely that any roof top equipment which operates 24 hours per day (such as refrigeration plant) will require either enclosure in acoustic screens to provide a line of sight break between the equipment and any future residences.

Other equipment external items (fans) would be expected to be capable of compliance through use of internal duct lining and/or in-duct attenuators.


6 CONCLUSION

This report provides the results of our assessment of traffic noise impacts on the amenity of future tenants within the proposed independent living units in Stage 1 of the Hardi Aged Care development.

Provided that the treatments set out in this report are implemented, internal noise levels shall comply with the requirements of AS2107:2016.

In addition, a noise emission assessment of mechanical plant has been undertaken. Provided recommendations within Section 5 are adopted, noise emissions will be in compliance with Council and EPA guidelines.

We trust this information is satisfactory. Please contact us should you have any further queries.

Yours faithfully,

Tom Aubusson


Appendix One –

Unattended Noise Monitor Results

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