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ACOUSTICAL ASSESSMENT

PROPOSED RESIDENTIAL DEVELOPMENT & CHILD CARE CENTRE

38-40 HORNSEY ROAD, 107-109 ARTHUR STREET AND 53-57

HENLEY ROAD, HOMEBUSH

48.4463.R2A:MCC

Prepared for: Active Kids Pre School Centre of Excellence

PO Box 162

HUNTERS HILL NSW 2110

Date: 19th January, 2018

The Acoustic Group Report 48.4463.R2A:MCC 19th January, 2018

CONTENTS

Page No

1.0 Introduction 1

2.0 The Site 1

3.0 Acoustic Criteria 2

3.1 Residential Development 2

3.2 Childcare Centre 5

4.0 Ambient Measurements 7

5.0 Acoustical Analysis 12

5.1 Traffic Noise Impact on Proposed Residential

Development 12

5.2 National Construction Code Acoustic

Requirements 13

5.3 Impact of Childcare Centre on Existing

Residences 14

5.3.1 Outdoor Areas 15

5.3.2 Indoor Areas 18

5.4 Impact of Outdoor Areas on Proposed

Residential Development 19

5.5 Vehicle Movements on Site for Childcare

Centre 21

5.6 Traffic Noise Impact on Childcare Centre 22

5.7 Mechanical Plant 24

5.8 Traffic Movements External to Site 26

6.0 Conclusion 26

6.1 Residential Component 27

6.2 Childcare Centre Component 28

APPENDICES

A: Site and Measurement Locations B: Logger Results

C: Attended Measurement Results D: Glazing Schedule E: Analysis of Childcare Noise Emissions F: Proposed Barriers

Acoustical Assessment – Proposed Residential Development and Childcare Centre Page 1 of 30 Active Kids Pre School Centre of Excellence

1.0 INTRODUCTION

The purpose of this report is to present the results, findings and recommendations of an

acoustic assessment with respect to the proposed residential development and Childcare

Centre at the subject site which consists of 38-40 Hornsey Road, 107-109 Arthur Street

and 53-57 Henley Road, Homebush.

The development involves demolition of the existing residential dwellings at 53-57 Henley

Road for the construction of a new Childcare Centre and the demolition of the existing

Childcare Centre and residential dwellings at 38-40 Hornsey Road and 107-109 Arthur

Street for the construction of a four-storey residential block with 42 apartments.

The Ground, Level 1 and Level 2 plans of the Childcare Centre by Robertson + Marks

(drawings no. A102/1 and A103/1, project no. 10321, dated 18/10/17) identify that the total

capacity of the proposed Childcare Centre is 200 children.

The Acoustic Group was requested to prepare an acoustic assessment of the proposed

residential development and Childcare Centre.

To undertake the assessment, unattended noise monitoring was conducted in the rear yard

of 57 Henley Road between Friday 25th November to Wednesday 30th November, 2016,

which was supplemented by attended measurements along Henley Road on Wednesday

7th December, 2016.

2.0 THE SITE

The subject site is bound by Henley Road to the east, Arthur Street to the south, and

Hornsey Road to the west. To the north of the proposed residential building is a four-storey

block of residential units at 32 Hornsey Road, whilst to the north of the proposed Childcare

Centre is a two-storey block of residential units.

Opposite the site on the eastern corner of the Henley Road and Arthur Street intersection

is a three-storey block of residential units, whilst on the southern side of Arthur Street is

Hudson Park Oval.

Arthur Street and Henley Street are sub-arterial/collector roads which provide access for

vehicular traffic to/from Centenary Drive. The ambient background noise at the location of

the proposed Childcare Centre is dominated by traffic on Arthur Street and Henley Road.

The flow of traffic at the Arthur Street and Henley Road intersection is controlled by a set

of traffic lights.

The architectural drawings of the proposed Childcare Centre by Robertson + Marks identify

that the Childcare Centre building will have an underground carpark (accessed via a

driveway off Henley Road which runs along the northern boundary of the site), three storeys

and a trafficable roof.

We are instructed that the outdoor play will occur on the ground floor level to the east, south

and west of the Childcare Centre building. Outdoor play will also occur on the western

balconies of the Childcare Centre building (Levels 1 and 2) and on the trafficable roof. The

Level 1 plan drawings shows a simulated outdoor play area in the south-eastern corner of

the Childcare Centre building. We are advised that the simulated outdoor play area is an

enclosed space that will have glazing along the façade and be mechanically ventilated.

3.0 ACOUSTIC CRITERIA

The two components of the proposed development are subject to different acoustic criteria.

3.1 Residential Development

Adjacent to the southern boundary of the subject site is Arthur Street which is the dominant

source of road traffic noise.

Clause 102 of State Environmental Planning Policy (Infrastructure) 2007 requires any

residential building on land adjacent to a major road corridor to comply with the specified

internal noise limits. The residential development is not adjacent to a major road corridor

and therefore Clause 102 of the Infrastructure SEPP does not apply.

However, the EPA’s NSW Road Noise Policy (“RNP”) specifies in the footnote to Table 3

that it is the land use developer’s responsibility (not Road and Maritime Services) to meet

the internal noise goals in the Infrastructure SEPP and refers the reader to Appendix C10

in the RNP for sensitive developments near ‘busy’ roads.

Appendix C10 of the RNP references supporting documents by the NSW Department of

Planning. The Development near Rail Corridors and Busy Roads – Interim Guideline

document (the “Interim Guideline”) by the NSW Department of Planning, defines in Chapter

1.3 a busy road as roads with an average annual daily traffic volume of more than 20,000

vehicles (based on the traffic volume data published on the website of the RTA) or any

other road with a high level of truck movements or bus traffic.

The section of Arthur Street adjacent to the site has not been the subject of a traffic count

by the RMS (by way of RTA/RMS publications). However, a traffic count on Arthur Street

was conducted by the RMS in 2017, to the west of Centenary Drive (approximately 300 m

from the site). The data reveals an Average Traffic Daily Count of 11,871 vehicles in the

eastbound direction (westbound data unavailable).

The traffic count by the RMS indicates that the average daily traffic volume on Arthur Street

in both directions could be greater than 20,000 vehicles (assuming a similar volume of

westbound traffic).

From the RMS traffic count data and observations of the traffic volume during the site visits,

Arthur Street is considered to fall under the definition of a busy road. Therefore, the internal

Leq noise goals (time period undefined) in the Infrastructure SEPP (of 35 dB(A) at any time

between 10pm and 7am for bedrooms during the night-time period and 40 dB(A) at any

time for other habitable rooms) would apply to the subject development.

Part C of the Strathfield Consolidated Development Control Plan (“DCP”) relates to

multiple-unit housing but does not provide any quantitative acoustic criteria in terms of road

traffic noise for residential receivers. Section 2.5.6 of the DCP refers to Australian Standard

AS2107 “Acoustics – Recommended Design Sound Levels & Reverberation Times for

Building Interiors” and AS3671 – 1989 “Acoustics – Road Traffic Noise Intrusion – Building

Siting and Construction”.

For houses and apartments near major roads, Table 1 of AS2107 recommends an Leq

noise design target (time period undefined) of 35 dB(A) for living areas, 30 dB(A) for

sleeping areas, 35 dB(A) for work areas and 45 dB(A) for common areas (e.g. foyer, lift

lobby, etc.).

From the two sets of internal noise targets, the internal noise targets in AS2017 have been

applied to the residential component of this development as they are lower than the internal

noise targets of the Infrastructure SEPP.

AS2017 does not identify for road traffic noise the time periods that the internal noise

targets apply. We have applied the time periods specified in the Interim Guideline

(assessment of bedrooms during the night-time period of 10:00 PM - 7:00 AM and at any

time for other habitable rooms) to the internal noise targets of AS2017 for this development.

Typically, one uses a 10 dB(A) reduction from outside to inside for an open window. Where

there are operable windows, then the requirements of the Building Code of Australia (BCA)

in relation to ventilation are satisfied.

Where the windows/doors are required to be closed in order to satisfy the internal noise

targets, alternative ventilation (such as mechanical ventilation, borrowed air from another

space or an attenuated duct/vent) is to be provided to that space.

Chapter 3.6.1 of the Interim Guideline suggests that for external noise levels exceeding 55

dB(A) outside bedrooms at night and 60 dB(A) for other habitable rooms, the ventilation

provided must satisfy the ventilation requirements of the BCA. Part F4.5(b) of the National

Construction Code (formerly BCA) requires mechanical ventilation or air-conditioning

systems to comply with AS 1668.2 and AS/NZS 3666.1.

This scenario excludes split air-conditioners unless there is a supplementary fresh air

supply.

In term of noise emission from the residential development, it is common practise for the

operation of mechanical plant to utilise the concept described in the EPA’s Noise Policy for

Industry of ambient background +5 dB(A) when assessed at residential boundaries not

associated with the subject development . This criterion, in terms of EPA noise policies, is

described as the “intrusive” noise target.

Clause 52 of the Protection of the Environment Operations (Noise Control) Regulation 2008

states that air conditioners and heat pump water heaters to be used on residential premises

must be inaudible within a habitable room in any other residential premises (regardless of

whether any door or window to that room is open) before 7 am or after 10 pm. For Saturday,

Sundays and public holidays, the criterion is applicable before 8 am and after 10 pm.

Determination of the inaudibility criterion is generally based upon a derived contribution of

between 7 to 10 dB below the background level, external to a residential premise. This

contribution indicates a negligible increase above the background level and should result

in compliance with the inaudibility criterion inside the dwelling.

This criterion relates to the impact of noise emission from air conditioners servicing the

residential dwellings of the proposed development to other residences within the subject

site as well as nearby residences.

From the above, for the residential apartment component of the development, the following

would apply:

• Internal noise level for living/dining rooms (from traffic), 35 dB(A) Leq

• Internal noise level for bedrooms (from traffic), 30 dB(A) Leq (10:00 PM – 7:00 AM)

• Noise emission of all mechanical plant background +5 dB(A), Leq (15 minutes)

• Noise emission from air conditioning units background -10 dB(A) between 10:00

PM and 7:00AM/8:00AM

3.2 Childcare Centre

In terms of general noise criteria, it is common practice for industrial and commercial

activities operating on a continuous basis to utilise a concept of ambient background +5

dB(A), when assessed at residential boundaries. This criterion, in terms of EPA noise

policies, is described as the “intrusive” noise target.

Part E of the DCP relates to Childcare Centres but does not provide any quantitative

acoustic criteria for the operation of such facilities.

Normally the Council in acoustic matters rely upon criteria issued by the EPA and in

particular the EPA's Noise Policy for Industry (“NPI”) or the Noise Guide for Local

Government (“NGLG”).

Reference to the EPA’s Noise Policy for Industry document does not provide specific

criteria for Childcare Centres but indicates modifying factors to the measured level of a

source under investigation to take account of tonality or impulsive events (Table C1) and

an adjustment to the acceptable noise level resulting from the duration of the noise event

(Table C3).

For various Childcare Centres/Pre-Schools/Kindergartens/Long Day Care Centres that

have come before the Land & Environment Court of New South Wales, there has been no

adjustment for tonality associated with children playing, although there have been

adjustments in terms of the general background +5 dB(A) criterion in relation to the total

duration of the outdoor play.

The Land & Environment Court has adopted over the years the concept of reduced use of

outdoor areas to permit a noise criterion of background +10 dB for outdoor play areas

where outdoor play occurs for 2 hours per day or less. Where the outdoor play exceeds 2

hours per day, the noise limit reduces to the general background +5 dB(A) limit. This

position represents the current practice of the Land & Environment Court.

In many situations barriers may be erected to reduce noise emission from the site (or noise

intrusion to the site), in addition to a provision of a management plan to identify the use of

the outdoor areas.

There is usually a requirement to also consider the noise impact from external road traffic

on the Childcare Centre. In considering noise impacts from external road traffic on the

Childcare Centre, Table 4 of the EPA’s NSW Road Noise Policy (“RNP”) provides the

following noise criteria:

• Maximum internal noise level within sleeping and indoor play areas of the centre to

be 35 dB(A) and 40 dB(A) respectively during operation when assessed as a 1 hour

• Maximum noise level in the outdoor play areas of the centre to be 55 dB(A) during

operation when assessed as a 1 hour Leq.

The RNP also provides road traffic noise assessment criteria in terms existing residences

affected by additional traffic on existing roads generated by land use developments. The

roads adjacent to the proposed Childcare Centre and surrounding residences are sub-

arterial/collector road. For the assessment of additional traffic on existing roads sub-arterial

road, Table 3 of the RNP specifies a 15 hour LAeq of 60 dB (façade corrected) external to

residential buildings. If such level is already exceeded, then traffic noise associated with

the development is permitted to be 2 dB above the existing noise level.

The traffic noise at the site and surrounding area is from traffic on Arthur Street which is

considered to be a collector/sub-arterial road. Therefore, the additional traffic from the

operation of the Childcare Centre is assessed in terms of the 15 hour Leq criterion in Table

3 of the RNP which specifies a façade corrected level of 60 dB(A) external to residential

buildings. If such level is already exceeded, then traffic noise associated with the

development is permitted to be 2 dB above the existing noise level.

With the arrival of staff prior to the operating hours of the Childcare Centre, there is a

possibility that the driveway along the northern boundary of the site will be in use before

7:00 AM. As this falls under the night-time period set out in the Noise Policy for Industry

(“NPI”) document, the sleep arousal criterion of background +15 dB(A) LAFmax outside any

bedroom window (obtained from the EPA’s Noise Guide for Local Government) has been

applied.

From the criteria above, the following noise targets have been assessed for the Childcare

Centre component of the development:

• Internal noise levels (from road traffic) 40 dB(A), Leq (1 hour)

• Internal noise levels of cot rooms (from road traffic) 35 dB(A), Leq (1 hour)

• External play areas (from road traffic) 55 dB(A), Leq (1 hour)

• Noise emission from the Childcare Centre background +5 dB(A), Leq (15 minutes) or

background +10 dB(A), Leq (15 minutes) where outdoor play occurs for 2 hours or

• Noise emission from use of driveway before 7:00 am at bedroom windows not to

exceed background +15 dB, LAFmax

• Noise emission from additional traffic on local road generated by the Childcare

Centre 60 dB(A), Leq (15 hours) or existing Leq (15 hours) +2 dB where the existing

Leq (15 hours) exceeds 60 dB(A)

4.0 AMBIENT MEASUREMENTS

In order to utilise the acoustic criteria in the previous section, it is necessary to obtain

ambient background (L90) and Leq levels to be applied at the residential boundaries and on

the site respectively.

Sound level measurements for this assessment were taken in accordance with the

Australian Standard AS1055 Acoustics – Description and Measurement of Environmental

Noise and ambient background measurement procedures set out in Fact Sheet B of the

Environment Protection Authority’s, Noise Policy for Industry.

Whilst one can utilise ambient background levels for compliance purposes from short

duration measurements, the preferred procedure set out by the EPA in their Noise Policy

for Industry document (the “NPI”) is to conduct noise monitoring over a period for a number

of days so as to determine the daily background noise levels, which in turn are used to

determine the Rating Background Level to be used for assessment purposes.

With respect to the NPI document, the background level is classified in terms of a daytime

period (7.00 AM to 6.00 PM), evening period (6.00 PM to 10.00 PM), and night time period

(10.00 PM to 7.00 AM), except for Sundays and public holidays when the night time period

is extended to 8.00 AM.

Unattended noise monitoring was carried out between Friday 25th November to

Wednesday 30th November, 2016, to record ambient noise levels in accordance with EPA

procedures for determination of a Rating Background Level (“RBL”). For the security of the

unattended noise logger, the noise logger was located in the rear yard of 57 Henley Street.

During the unattended noise monitoring, there was a dilapidated timber fence along the

Arthur Street boundary of 57 Henley Street. The unattended sound level measurements

were recorded using a SVAN 957 Sound Level Meter (serial no. 21450).

Observation of weather data indicates that there were no occurrences of adverse weather

during the unattended monitoring period.

The logger graphs show that in general the ambient noise levels during the daytime and

evening periods are elevated when compared to the night time period which is a result of

higher volumes of road traffic in the area during the daytime and evening periods.

The EPA’s RBL assessment procedure requires determination of a background level for

each day (the ABL) and then the derivation of the median of the individual days for the

entire monitoring period.

The daytime background L90 and Leq levels shown in Table 1 below have been derived in

accordance with the NPI procedure.

Table 1: Logger Ambient L90 and Leq Levels – dB(A)

Date RBL Daily Leq Level

Saturday 26 November 2016 47.0 56.6

Sunday 27 November 2016 47.2 56.8

Monday 28 November 2016 46.7 57.4

Tuesday 29 November 2016 49.7 57.6

Median ** 47.1 -

Average ** - 57.1

** The Rating Background Level (RBL) is the median of the daily background

levels, whilst the Ambient Leq is the logarithmic average of the daily results.

As the Childcare Centre does not operate of weekends, elimination of the ambient data

obtained during the weekend reveals the weekday RBL and ambient Leq levels of 48 dB(A)

and 58 dB(A) respectively.

The application for new residential units (subject to specific noise controls) and existing

residences (subject to existing ambient levels) requires supplementary ambient

measurements and derivation of separate noise targets described below.

In addition to noise logger measurements, attended measurements were conducted along

Henley Road on Wednesday 7th December, 2016, using a Brüel & Kjær Sound Level Meter

Type 2250 (serial no. 3004338).

Our attended and unattended monitoring revealed a range of ambient noise levels across

the site that in turn lead to different noise target for the different assessment locations.

The weather conditions during the attended measurements were warm (21 oC) and clear

with no wind detected at the site.

The result of the attended measurements are provided in Appendix C as A-weighted time

splice graphs and a table of statistical octave band data.

The upper time splice graph in Appendix C1 relates to the 15 minute sample measurement

conducted on the footpath in front of 51 Henley Road. Ambient background and Leq levels

of 52 dB(A) and 64 dB(A) respectively were recorded at Location 1, which was dominated

by the noise of road traffic on Arthur Street and Henley Road.

Moving south to Location 2, at the corner of Henley Road and Arthur Street, there was an

increase an ambient noise levels as a result of Location 2 being closer in proximity to Arthur

Street and the vehicles on Henley Road that are idling/accelerating from the traffic lights at

the Arthur Street and Henley Road intersection. Ambient background and Leq levels of 55

dB(A) and 65 dB(A) respectively were recorded at this measurement location.

The eastern façade of the proposed residential building to the west of the Childcare Centre

is expected to experience ambient noise levels that area slightly higher than the ambient

levels recorded by the unattended noise logger, as the logger was subject to partial

shielding of noise from vehicles on Arthur Street by the timber fence along the southern

boundary of 57 Henley Road. Taking into consideration the attenuation of road traffic noise

from Arthur Street to the logger location by the existing timber fence, the daytime

background level at the eastern façade of the proposed residential dwelling (without

shielding) is considered to be 49 dB(A).

Similarly, the Leq level of road traffic noise that the proposed residential development will

experience will be greater than the Leq level obtained from the logger data. For the

southern façade of the proposed residential building that will be exposed to road traffic

noise from Arthur Street and closer in proximity to Arthur Street than the logger location,

the day and night-time Leq levels at the façade are considered to be 64 dB(A) and 60 dB(A)

respectively.

The eastern and western facades of the proposed residential development will have a

reduced view of the road traffic on Arthur Street. Therefore, the day and night-time Leq

levels at these facades are considered to be 61 dB(A) and 57 dB(A) respectively.

For the northern façade of the proposed residential development, the day and night-time

Leq levels are considered to be 47 dB(A) and 43 dB(A) respectively for this assessment as

the façade will be shielded from the road traffic noise.

In terms of the residential buildings adjacent to the north and to the north-west of the

Childcare Centre, the southern façade of those residential buildings will experience a lower

noise contribution from traffic on Arthur Street than the logger location, as a result of

distance attenuation and shielding by the Childcare Centre/proposed residential building.

Taking into consideration the shielding and distance attenuation of road traffic noise from

Arthur Street the background level assigned to the southern façade of the residential

buildings to the north and north-west of the Childcare Centre is 43 dB(A).

The residential building to the east of the Childcare Centre is exposed to road traffic noise

from Arthur Street and Henley Road and experiences higher ambient noise levels than the

logger location which was shielded from the noise of road traffic on Henley Road by the

existing dwellings at the site to the east of the logger location. Normalising the attended

measurement at Location 2, near the corner of Arthur Street and Henley Road, to the logger

results, a background level of 54 dB(A) has been assigned to the residential building to the

east of the Childcare Centre.

The background/Leq levels assigned for the nearest residential receivers to the proposed

Childcare Centre for this assessment are summarised in Table 2 below.

Table 2: Ambient Leq and L90 Background Levels for Assessment

Residential

Receiver Facade

Leq L90 Background

Day (7 AM –

10 PM)

Night (10

PM – 7 AM)

Day (7 AM – 6

Proposed

Residential

Development

Southern 64 60 -

Eastern/Western 61 57 49

Northern 47 43 -

North/North-

West of

Childcare

Centre

Southern N/A N/A 43

East of

Childcare

Centre

Western N/A N/A 54

In terms of potential sleep disturbance from the arrival of Childcare Centre staff prior to

7:00 AM, the use of a premise that occurs for a short period before the daytime period i.e.

prior to 7:00 AM is identified in the Noise Policy for Industry as a shoulder period.

Utilising the lowest background level from 6:00 AM to 7:00 AM for each of the weekdays

(set out in Appendix C), the Rating Background Level obtained by the logger for the

weekday periods of 6:00 AM to 7:00AM becomes 50 dB(A).

The primary function of considering the RBL in the 6:00 AM – 7:00 AM period is in relation

to the use of the driveway by staff before the Childcare Centre opens for business. As this

period falls within the night time period set out in the NPI document, the sleep arousal

criterion of background +15 dB(A) L1 (1 minute) outside any bedroom window obtained

from the EPA’s Noise Guide for Local Government has been applied.

The Basement 1 and Ground Level plans (drawing no. A101a/1 and A102/1) show the

proposed Childcare Centre has underground parking which is accessed via a driveway off

Henley Street which runs along the northern boundary of the site. Therefore, the residential

receiver locations potentially to be impacted by the use of the driveway before 7:00 AM will

be the residential building adjacent to the northern boundary of the site. Taking into

consideration the difference in noise levels between the logger location and the southern

façade of the residence, a background level of 46 dB(A) for the period of 6:00 AM – 7:00

AM is assigned to the southern façade of the residence.

5.0 ACOUSTIC ANALYSIS

5.1 Traffic Noise Impact on Proposed Residential Development

For normal building constructions, the outside to inside attenuation of an open window is

generally approximated as 10 dB(A), whilst an attenuation of 20 – 25 dB(A) is assigned for

closed windows. Considering the level of road traffic noise assigned to the facades of the

residential development, the doors and windows of the proposed residential development

would need to be closed to achieve the internal noise targets and a majority of those

windows having upgraded glazing.

Whilst road traffic noise and rail traffic noise are expressed as an A-weighted value, the

sound attenuation performance of building elements are expressed in an apparent

weighted reduction index (Rw) which is not the same as a dB(A) curve. The attenuation for

building elements in dB(A) can be approximated as the Rw value minus 7.

Table 3 provides a general summary of the glazing and ventilation requirements for the

facades of the proposed residential development, in order to satisfy the internal noise

targets. As all the habitable rooms and bedrooms cannot achieve the internal noise targets

with natural ventilation via open window/doors, they will require the provision of alternative

ventilation.

A more detailed summary of the glazing requirements is set out in Appendix D which

nominates the various types of glazing thickness that may be used.

Table 3: General Glazing/Ventilation Requirements

Upgrade

Glazing

Alternative

Ventilation

Northern Façade No Yes

Eastern/Western Façades Yes Yes

Southern Façade Yes Yes

For the bedroom on the southern façade of Levels 3 and 4 that have balconies, the

attenuation of road traffic noise as a result of the balustrades will reduce the glazing

thickness required for those windows in comparison to the bedrooms along the southern

façade that do not have balconies.

5.2 National Construction Code Acoustic Requirements

The Building Code of Australia (now called the National Construction Code) identifies

sound insulation requirements between apartments with various wall and floor

constructions provided in the document that are deemed to comply with the specified limits.

These criteria relate to noise transference between different apartments whereas the

Infrastructure SEPP and the EPA guidelines relate to noise intrusion from external noise

sources.

The matter of isolating noise from plumbing stacks and the like falls under standard

conditions and requires those plumbing stacks to be contained within bathroom, laundries

and kitchens and not in habitable rooms such as bedrooms, living rooms and dining rooms

in view of the increase in acoustic performance.

From an acoustic perspective of the BCA requirements, the major issue in terms of the

plans available at development application stage relates to walls that separate a bathroom,

toilet or kitchen of one unit versus a living room/bedroom of another unit. That construction

requires impact isolation and a higher noise rating that is normally accommodated by

having a cavity construction for those walls.

The plan drawings (drawing no. A102/1, A103/1 and A104/1) identify that all apartments

have the situation of a bathroom, toilet or kitchen adjacent to a habitable room of another

apartment. Therefore, all walls between apartments are required to be cavity walls.

5.3 Impact of Childcare Centre on Existing Residences

In relation to the assessment of noise emission of the Childcare Centre, we rely upon

previous sound level measurements of childcare centre, preschool and kindergarten

operations to establish noise emission levels as the source data. Generally, we have found

a greater degree of noise emission from Council-type childcare centres where “free play”

tends to be vigorous, incorporate a large number of children and subject to minimal

supervision. For private Childcare Centres, we have found a greater number of staff

supervising such play. There are smaller groups of children and outdoor activities are more

structured (and noticeably quieter).

Generic data in dB(A) is available for Childcare Centres that provides a range of noise

emission levels (e.g. AAAC Childcare Centre guideline) but is absent spectrum data

necessary for assessing barrier effects.

Octave band noise data results from the Thumbelina Childcare Centre (owned and

operated by Active Kids) in Edgecliff in relation to the active play noise levels of children

from 3-5 years old have been utilised as the base source data for this assessment.

Compliance testing of Childcare Centre at 32 Palmerston Road, Hornsby has validated the

base source data with respect to sound power levels suggested in the AAAC guideline.

The Ground, Level 1 and Level 2 plan drawings (drawing no. A102/1 and A103/1) identify

that the proposed Childcare Centre is to accommodate a total of 52 children in the 0-2

years age group, 54 children in the 2-3 years age group and 94 children in the 3-5 years

age group.

The source and assessment locations are illustrated in Appendices E1 – E3.

For the two-storey residential buildings to the north and north-west of the Childcare Centre,

the assessment locations are on the upper level, southern façade of the building. The

ground level of the residential buildings will experience lower noise emission levels from

the Childcare Centre as a result of a greater barrier attenuation effect of noise emission

from children in the outdoor play areas.

For the residential building opposite the Childcare Centre on the eastern side of Henley

Road, the assessment location is on the upper level, western façade of the building as the

lower levels of the residential building would experience a greater barrier attenuation effect

of noise emission from the ground level and roof deck outdoor play areas.

5.3.1 Outdoor Areas

The different residential receivers in proximity to the Childcare Centre are subject to

different acoustic environments/criteria as discussed in Section 4 of this assessment report.

On previous assessments, the Council have required identification of the resultant noise

impacts for the various residential receiver locations.

The ground level of the proposed Childcare Centre has outdoor play areas on the eastern,

southern and western sides of the site. In general, our assessment found the noise

emission from an outdoor play area to be negligible at a residential receiver location on the

opposite side of the Childcare Centre building as a result of shielding by the Childcare

Centre building.

In terms of the eastern outdoor play area on the ground floor level, the nearest receiver is

the dwelling adjacent to the northern boundary of the site.

The assessment considers a noise target of background +10 dB for the ground level

outdoor play area by restricting the operation of this area to a maximum of 2 hours per day.

For the remainder of the outdoor play areas to operate without a time restriction, the total

noise contribution of these areas is to be below the background level at the residence to

the north of the site.

To control the noise emission of the ground level outdoor play area, the assessment

considers a maximum of 26 children in this area and a 2.7 metre high barrier on the northern

side of the outdoor play area, not on the boundary. The barrier is to be constructed as a

vertical lapped-and-capped timber fence with a height of 1.8 metres with the remainder of

the height being angled in towards the outdoor play area at 45 degrees. The angled upper

section can be constructed from perspex or solid (not multi-cell) polycarbonate to allow

solar access.

For the ground level outdoor play area to the south of the Childcare Centre building, the

assessment considers this area to have a maximum capacity of 36 children.

The outdoor play area to the west of the Childcare Centre building is to be used for 0 to 2-

year-old children only for a maximum of two classrooms at a time (28 children).

The application provides a simulated outdoor play area in the south-eastern corner, first

floor level of the Childcare Centre building. We are advised that the simulated outdoor play

area will have glazing along the building façade and be mechanically ventilated. As a result

of the attenuation through the glazing elements and shielding by the Childcare Centre

building to the residential receivers north of the Childcare Centre, the noise emission from

the simulated outdoor play area is expected to be negligible.

On Levels 1 and 2 of the western side of the Childcare Centre building are balconies that

operate as outdoor play areas. We are advised that the balustrades along the perimeter

of the balconies will be constructed from glass and have a height of 1.4 metres. To shield

the residential receivers to the north and north-west of the Childcare Centre, we

recommend a wall along the northern side of the balconies. To reduce the reverberant

build-up of noise in these outdoor play areas, the underside of the ceiling is to be lined with

acoustic absorptive material (such as CSR Martini Polyester 50 mm thick Absorb MD50)

with a perforated facing that has an open area of at least 23%.

With respect to the operation of the two outdoor play areas on the western balconies of the

Childcare Centre building, the assessment considers each balcony to have a maximum

capacity of 20 children. Active play cannot occur on the balconies whilst the ground level

outdoor play area on the western side of the Childcare Centre building is in use. Active

play cannot occur on both balconies simultaneously.

The roof deck of the Childcare Centre operates as an outdoor area.

To control the noise emission of children on the roof deck to Level 3 of the proposed

residential building to the west of the Childcare Centre, the assessment considers the

south-eastern corner of the roof deck (highlighted red in Appendix E3) to be used for active

play with a maximum capacity of 56 children. The proposed residential building to the west

of the Childcare Centre would be shielded from the noise emission of children in the south-

eastern corner of the roof deck by the building structure on the roof deck.

The assessment considers the remainder of the roof deck to be used for passive learning

activities for a maximum of 36 children.

The landscape of the roof deck has been designed to facilitate the different uses of the roof

We are advised that the balustrade along the perimeter of the roof deck has a height of 1.4

metres and will be constructed from glass. As a result, the balustrades will provide

shielding of noise from the roof deck to the residential assessment locations below the

elevation of the roof deck.

Our analysis considers the children spread out across the outdoor area and has adopted

the conservative approach by considering the upper range of sound power levels

nominated by the AAAC guideline for children in the 0-2 years and 3-6 years age groups.

As there are limited octave band measurements of active play for 2 to 3-year-old children,

the analysis utilises the octave band sound power levels of 3 to 6-year-olds to calculate the

noise contribution of the 2 to 5-year-olds in the outdoor areas, noting that the actual noise

contribution will be lower than the calculated result.

For passive learning activities that occur in the outdoor areas, these activities would

generate lower noise emission levels than active outdoor play by reason of the structured

nature of passive learning activities. As a result, we have considered in our analysis

passive learning activities in the outdoor area to generate noise emission levels 10 dB

lower than active play.

From the A-weighted and octave band sound power levels (normalised to the Active Kids

Thumbelina Child Care Centre), the relevant distance attenuation and barrier shielding

were determined so as to derive a contribution for each source location with respect to the

receiver location.

Extracts of the plan drawings for the proposed Childcare Centre are provided in

Appendices E1 – E3. Superimposed onto the plan drawings are red dots which illustrate

the source locations utilised for the assessment and yellow dots which illustrate the

residential assessment locations.

Appendices E4 – E19 provides the calculation of noise emission from the Childcare Centre

to the upper level of the residential building to the north-west which reveals compliance

with the EPA’s intrusive noise target of background +5 dB(A).

The calculation of noise emission from the Childcare Centre to the upper level of the

residential building adjacent to the northern boundary of the Childcare Centre is set out in

Appendices E10 – E13. The calculations reveals the contribution of the ground level

outdoor play area to the east of the Childcare Centre building satisfies the background +10

dB(A) noise target for a time restricted operation. The noise contribution of the roof deck

is 4 dB less than the background level at the northern residence.

The calculation of noise emission from the Childcare Centre to the upper level of the

residential building opposite the site on the eastern side of Henley Road is set out in

Appendices E20 – E23. The calculations reveals the total contribution of the outdoor play

areas and simulated outdoor area in the south-eastern corner of the Childcare Centre

building is 3 dB above the background level at the eastern residence and therefore satisfies

the EPA’s intrusive noise criterion.

The proposed barriers are illustrated in Appendix F.

Other residential receivers are further removed from the subject site and/or are shielded

from the noise emission of the Childcare Centre by other buildings. As a result, other

residential receivers would experience lower noise emission levels from the Childcare

Centre that the assessed residential locations and therefore automatically comply with the

EPA’s intrusive noise criterion.

5.3.2 Indoor Areas

The plan drawings show classrooms along the northern façade on Ground Level, Level 1

and Level 2. The ground level classrooms are for the 0 to 2-year-old children, the Level 1

classrooms are for 2 to 3-year-old children, whilst the Level 2 classroom is for 3 to 5-year-

old children.

The residence potentially affected by noise from the indoor areas of the Childcare Centre

is adjacent to the northern boundary of the Childcare Centre. As a result of the requirement

of the classroom windows on the eastern façade of the Childcare Centre to be closed (to

control traffic noise intrusion into the Childcare Centre), the noise emission of the

classrooms at the residences on the eastern side of Henley Road will be subject to

attenuation through the glazing elements and therefore is expected to be negligible for

those residences.

Typically the structured nature of the activities that take place indoors (such as structured

learning, sleeping and painting, etc.) generate lower noise emission levels in comparison

to active outdoor play. For this assessment, we have considered indoor activities to

generate noise emission levels 10 dB less than active outdoor play. For the occurrence of

noisier activities (such as singing, etc.) in the classrooms, we have considered noise

emission levels from such activities to be at the lower range of sound power levels

nominated in the AAAC guideline.

With respect to the classrooms for 2-3 year old children and 3-5 year old children along the

northern side of the Childcare Centre building (Levels 1 and 2), the assessment of noise

emission reveals the windows along the northern façade of these classrooms are required

to be closed when the classroom is in use.

In terms of the western classroom on the northern façade of the ground level (for 0-2 year

old children), our assessment reveals the classroom can operate with the northern window

5.4 Impact of Childcare Centre on Proposed Residential Development

With respect to the proposed residential development, the existing ambient noise from

traffic will be in the order of 10 dB(A) above the background level and provide masking of

the Childcare Centre noise emissions and renders the general background +5 dB(A) noise

limit for Childcare Centre noise irrelevant.

The apartment on the eastern façade of Level 3 will have an uninterrupted line-of-sight to

the western outdoor play areas on Levels 1 and 2 and the areas of the roof deck used for

passive learning activities.

In view of the requirement to achieve an acceptable acoustic amenity from road traffic noise

for the occupants of the apartments, the NSW Road Noise Policy (and Infrastructure SEPP)

recommend the provision of noise controls (including mechanical ventilation) to achieve an

internal noise target of 40 dB(A) for habitable spaces in the day (Section 5.1).

The DCP requires compliance with AS 2017 that for dwellings adjacent to a major road to

have a lower design target of 35 dB(A). This limit relates to all noise intrusion and not just

road traffic noise.

Accordingly, the noise emitted from the Childcare Centre with respect to the proposed

residential development is to comply with a noise design target 30 dB(A) (with

doors/windows closed and mechanical ventilation operating) in accordance with AS 2017

to satisfy the DCP.

In accordance with similar projects before the L & EC of NSW, notation should be provided

on the title of the apartments of the design target for the Childcare Centre and road traffic

noise.

The noise controls to the apartments to address road traffic noise intrusion to satisfy the

DCP automatically lead to compliance for the Childcare Centre.

The calculations of noise emission from the Childcare Centre to the windows on eastern

façade of Level 3 eastern façade are presented in Appendices E14 – E19. The calculations

reveal the total contribution of the outdoor play areas is less than or equal to the existing

ambient Leq level at the eastern façade of the proposed residential development. Taking

into consideration attenuation via the closed windows/external wall, the noise emission

from the Childcare Centre is calculated to be 30 dB(A) inside the apartment along the

eastern façade of the proposed residential development.

The Ground Level – Level 2 of the eastern façade will experience lower noise emission

levels from the Childcare Centre than that calculated for Level 3 as a result of the

balustrades on the western side of the Childcare Centre building providing a greater degree

of attenuation.

5.5 Vehicle Movements On-Site for Childcare Centre

There is a requirement to consider sleep disturbance in the event that staff arrive before

7:00 AM and utilise the driveway along the northern boundary of the site to access the

basement level carpark.

The nearest residence to the driveway is the two storey residential building adjacent to the

northern boundary of the site. The upper level of the residential building would experience

a higher level of noise emission from vehicle movements on the Childcare Centre’s

driveway than the ground level as a result of shielding to the ground level of the residential

building by the boundary fence.

Previous measurements of vehicles travelling down a 1:6.25 gradient at low speeds

revealed an SEL of 57.0 dB(A) and a maximum level of 48 dB(A) when measured at a

position that has a horizontal distance of 8 metres from the vehicle path and 5.3 metres

above the ground (L & EC 254836 of 2016). The SEL of vehicles ascending the gradient

at slow speeds was measured to be 60.6 dB(A) when at a horizontal distance of 5 metres

from the vehicle path and 5.3 metres above the ground. The physical relationship between

the measurement location and vehicle path is similar to that of the windows on the upper

level of the residential building to the north (southern façade) and the driveway of the

Childcare Centre.

The Basement 1 and Ground Level plans (drawing no. A101a/1 and A102/1) identify that

the gradient of the driveway varies between 1:6.5 to 1:20.

From the logger results and taking into consideration shielding/distance attenuation of road

traffic noise from Arthur Street, the background level at the residential building to the north

of the Childcare Centre for the 6:00 AM – 7:00 AM period is considered to be 46 dB(A).

Therefore the maximum noise level of 48 dB(A) for vehicles descending the driveway

clearly easily satisfies the sleep disturbance criterion of background +15 dB(A).

In terms of vehicle movements on site during the operating hours of the Childcare Centre

(drop-off/pick-up of children), the vehicle noise is required to be assessed in terms of the

EPA’s intrusive noise target of background +5 dB(A) as an Leq 15 minutes, at residential

boundaries.

Typically, the drop-off of children occurs over a 2 hour period. Assuming that the arrival of

200 children (maximum capacity of the proposed Childcare Centre) occurs steadily over a

2 hour period, the number of vehicle movements on the driveway in a 15 minute period

used in this assessment will be 50 (25 descending and 25 ascending).

The Leq 15 minute level of vehicle movements on the driveway during the drop-off period

is calculated to be 46 dB(A) at the upper level of the residential building which is 3 dB more

than the daytime background level at the southern façade of the existing northern residence

and therefore satisfies the EPA’s intrusive noise criteria.

5.6 Traffic Noise Impact on Childcare Centre

With respect to the traffic noise at the site intruding into the external and internal areas of

the Childcare Centre, the EPA’s RNP identifies in Table 4, the noise level target for outdoor

and indoor play areas at child care facilities is not to exceed LAeq,1 hour 55 dB and LAeq,1 hour

40 dB respectively. For cot rooms, the internal level from road traffic is not to exceed LAeq,1

hour 35 dB.

of the RNP (Appendix B3 – Noise Monitoring Procedures) reveals the LAeq,1 hour is

the “average maximum” one-hour noise level, not an energy average level over the day.

The procedure is to determine the LAeq,1 hour from the logger measurements that is exceeded

10% of the time for each day and then the median value of the individual days.

From the logger results, the LAeq,1 hour during the daytime period (7:00 AM – 6:00 PM) is 59

dB(A).

Taking into consideration the shielding provided by the proposed 2 metre high fence along

the southern boundary, and the distance from Arthur Street to the southern façade of the

proposed Childcare Centre, the façade corrected LAeq,1 hour level of road traffic at the ground

level of the southern façade is considered to be 60 dB(A).

The attenuation of outside noise to an inside space through an open window is generally

taken to be 10 dB, whilst for a closed window the attenuation is generally taken to be 20-

25 dB. Therefore, the windows of the classrooms and cot room on the ground level of the

southern façade are required to be closed to satisfy the internal noise target. The windows

for the cot room is required to have 6.38 mm thick laminated glazing whilst the glazing for

the classroom on the southern façade can be weight per size.

In terms of the glazing requirements for the classroom in the south-eastern corner of the

ground floor level, the windows on the southern façade are to have 5 mm thick glazing.

The windows on the eastern façade have a reduced view of the road traffic on Arthur Street

(in comparison to the southern façade). Therefore the glazing for the windows on the

eastern façade of the ground floor level can be weight per size.

In terms of the northern façade of the Childcare Centre building, there will be distance

attenuation and shielding of road traffic noise from Arthur Street by the Childcare Centre

building. The attended measurement at Location 1 which is exposed to Henley Road and

Arthur Street reveals a Leq level that is on average 7 dB higher than the logger results for

similar time periods. Taking into consideration the shielding of road traffic noise from Arthur

Street by the Childcare Centre building and distance attenuation from Henley Road, the

LAeq,1 hour level assigned to the eastern side of the northern façade is 53 dB(A) whilst the

western side of the northern façade is assigned an LAeq,1 hour level of 49 dB(A). As such,

the eastern cot room and classroom on the northern façade can have weight per size

glazing but the windows are required to be closed. The western classroom on the northern

façade can satisfy the internal noise target with open windows.

The cot room in the north-western corner of the Childcare Centre (ground level) has a

window on the western façade which will have a reduced view of the road traffic and is

further from Arthur Street than the logger location. As such, the LAeq,1 hour level assigned

external to the western window is 49 dB(A). Therefore, the window is required to be closed

to satisfy the internal noise target. Ventilation to the cot room can be achieved via a duct

on the northern façade or mechanical ventilation.

The classroom on Level 1 of the northern façade is required to have windows closed when

in use to address noise emission from the classroom to the residential receiver adjacent to

the northern boundary of the Childcare Centre. With the northern windows closed, this

classroom can achieve the internal noise design target with weight per size glazing.

For the classroom on Level 2, which has windows on the northern, eastern and southern

facades, the windows on the eastern and southern facades are required to be closed to

satisfy the internal noise design target whilst the windows on the northern façade are

required to be closed to address noise emission from the classroom. The glazing of the

windows on the eastern façade of the Level 2 classroom is required to be 6.38 mm

laminated glass whilst the southern façade of the classroom requires 10.5 mm laminated

glass (such as Viridian VLam Hush).

In terms of the outdoor areas on Level 1, Level 2 and the roof deck, the 1.4 metre high

balustrades along the boundaries of the outdoor play areas will provide shielding of road

traffic noise. The level of road traffic noise on the roof deck is calculated to be less 55

dB(A) and therefore satisfies the noise target for outdoor play areas.

With respect to the outdoor areas on the ground level to the east, south and west of the

Childcare Centre building, the normalised LAeq,1 hour level at the south-eastern and north-

eastern corners of the site are 67 dB(A) and 66 dB(A) respectively. To satisfy the external

noise target, a 2 metre high solid fence (such as lapped-and-capped timber) is required on

the southern and eastern boundaries of the site.

5.7 Mechanical Plant

We are advised that the proposed residential apartments will have air condenser units

located on the balcony. A majority of the balconies are on the northern side of the

residential building. However, the specific locations and selection of mechanical plant have

not been finalised noting that requirements for the mechanical plant associated with the

proposed development to comply with the EPA’s criteria normally occur at the Construction

Certificate stage.

At this stage of the proposal, our acoustic assessment of mechanical plant noise is limited

to nominating project specific criteria in terms of the EPA’s intrusive noise criterion and

Protection of the Environment Operations (Noise Control) Regulation 2008 which have

been derived from the measurement results of the background levels.

The EPA requires the operation of the Childcare Centre to not exceed the background level

by 5 dB(A) at the residential boundary. The noise from the operation of the Childcare

Centre will be a contribution of mechanical plant noise and noise from children in the

outdoor area/simulated outside play area. For the operation of the entire Childcare Centre

to not exceed the background level by 5 dB(A) at the boundary of the existing residences,

the noise contribution from the Childcare Centre mechanical plant is to be less than 41

dB(A) at the residential boundary to the north and 56 dB(A) at the residential boundary to

the east.

In terms of air conditioning servicing the proposed residential development, achieving

inaudibility in habitable rooms during the night-time period to comply with the Protection of

the Environment Operations (Noise Control) Regulation 2008, will require the noise

contribution of air conditioners to be more than 10 dB below the background level at

residential boundaries for the time periods of 10pm – 7am/8am.

The northern side of the proposed residential development and the existing residential

buildings adjacent to the northern boundary of the proposed residential development will

experience a lower background level than the logger location as they will be shielded from

the noise of road traffic on Arthur Street.

Taking into consideration the attended and unattended measurement results, shielding

provided by the proposed residential development and distance attenuation, Table 4 below

provides noise design targets for the cumulative noise from all mechanical plant servicing

the proposed residential development with respect to the intrusive noise criterion and

Clause 52 of the Protection of the Environment Operations (Noise Control) Regulation

2008. The noise design targets are in terms of an LAeq, 15 minute level.

It is noted that the operation of mechanical plant for the proposed residential development

is limited to the adjoining properties in terms of the intrusive noise target. If air conditioning

is provided then the inaudibility requirement from the Protection of the Environment

Operations (Noise Control) Regulation 2008 applies to the adjoining properties as identified

in Table 4 and will also apply to individual apartments within the subject development.

Table 4: Mechanical Plant Noise Design Targets at Northern Residences

Intrusive Noise Criterion Inaudibility

Criterion**

Daytime

(7am-6pm)

Evening

(6pm-10pm)

Night-time

(10pm-7am)

Before 7am/ After

48 46 40 25

*before 8am/after 10pm on Saturdays, Sundays and public holidays

**only applicable to air conditioners

5.8 Traffic Movements External to Site

With respect to the additional traffic on the existing roads that will be generated by the

Childcare Centre, the RNP specifies an LAeq,15 hour noise target of 60 dB. The assessment

location is external to the façade of residential dwellings and therefore a requires a façade

correction from free field measurements/predictions of +2.5 dB.

The LAeq, 15 hour level recorded by the unattended logger for weekdays is 60 dB(A) (façade

corrected). Normalising the logger results to the attended measurement at Location 1 on

Henley Road indicates an LAeq, 15 hour level of 68 dB(A). As the existing Leq level of traffic

in the area exceeds 60 dB(A), the additional traffic generated by the proposed Childcare

Centre is permitted (from the RNP) to be 2 dB above the existing noise level. This gives

rise to a noise target at the residential receivers of 70 dB(A) for the additional traffic.

The assessment considers the additional traffic generated on Henley Road by the

proposed Childcare Centre could be in the order of 500 vehicles per day (4 vehicles

movements per child from parents entering/leaving site for drop-off/pick-up and vehicle

movements from staff entering/leaving the site).

Using the Calculation of Road Traffic Noise methodology, the Leq, 15 hour level of the

additional traffic at the front facades of the residences on Henley Road is calculated to be

in the order of 50 dB(A) which is significantly below the existing Leq level and therefore

satisfies the RNP noise design target.

6.0 CONCLUSION

The proposed residential building and Childcare Centre is to be developed at the subject

site which consists of 38-40 Hornsey Road, 107-109 Arthur Street and 53-57 Henley Road,

Homebush.

The development involves demolition of the existing residential dwellings at 53-57 Henley

Road for the construction of a new Childcare Centre and demolition of the existing

Childcare Centre and residential dwellings at 38-40 Hornsey Road and 107-109 Arthur

Street, for the construction of a four-storey block of residential units.

Our assessment involved measurements (by an unattended noise logger) in the rear yard

of 57 Henley Road between Friday 25th November to Wednesday 30th November, 2016,

and attended measurements conducted on Wednesday 7th December, 2016.

6.1 Residential Component

An analysis of traffic noise intrusion was conducted with respect to the proposed residential

development which revealed the habitable rooms are required to have windows closed and

alternative ventilation in order to comply with the internal road traffic noise design targets.

The acoustic requirements do not mean fixed glazing, as the windows are openable.

However, those rooms require under the EPA’s Road Noise Policy the provision of

mechanical ventilation.

The rooms along the northern façade can utilise glazing of weight per size. An upgrade to

the acoustic performance of the glazing for the habitable rooms along the eastern, southern

and western facades of the proposed residential development is required. A summary of

the glazing requirements for the residential development is set out in Appendix D.

For dwellings adjacent to a major road, the DCP requires compliance with AS 2017 which

recommends internal noise levels that relate to all noise intrusion and not just road traffic

noise. The noise controls to the apartments to address road traffic noise intrusion to satisfy

the DCP automatically leads to acoustic compliance for the Childcare Centre.

In accordance with similar projects before the L & EC of NSW where a developer develops

adjoining properties of different use, notation should be provided on the title of the

apartments of the design target/noise controls for the Childcare Centre and road traffic

noise.

The acoustic criteria in Part F5 of the National Construction Code (formerly the Building

Code of Australia) are automatically required to be satisfied for the subject residential

development. Review of the plan drawings identified all apartments have the situation of

a bathroom/kitchen of one apartment adjacent to a bedroom, living room or dining room of

another apartment. Therefore, acoustic upgrading of all walls between apartments will be

required.

At the development application stage, the location and selection of mechanical plant is

unknown. Normally, requirements for the mechanical plant associated with the proposed

development to comply with the EPA’s criteria occur at the Construction Certificate stage.

Mechanical plant is normally assessed with respect to the EPA's Noise Policy for Industry

target of background +5 dB(A) at residential boundaries not associated with the subject

development. Air conditioners for the apartments (if provided) have to comply with Clause

52 of the Protection of the Environment Operations (Noise Control) Regulation 2008 which

requires inaudibility in any habitable room of another premises during the night-time period.

Background levels have been obtained from the attended and unattended measurements

which lead to noise targets for such plant (see Table 4).

6.2 Childcare Centre Component

An analysis of the noise emission from the Childcare Centre was conducted with respect

to the proposed residential building to the west and the existing residential buildings to the

north, north-west and east of the site.

The assessment of noise emission from and traffic noise intrusion into the outdoor areas

of the Childcare Centre revealed the following noise controls are required:

• The operation of the ground level outdoor play area to the east of the Childcare

Centre building is restricted to 2 hours per day with a maximum of 26 children.

• 2.7 metre high barrier along the northern side of the ground level outdoor play area

to the east of the Childcare Centre. The barrier is to be constructed as a 1.8 m

high vertical lapped-and-capped timber fence with the remainder of the height

being angled in towards the outdoor play area at 45 degrees. The angled upper

section can be constructed of perspex/solid (not multi-cell) polycarbonate.

• Ground level outdoor play area to the west of the Childcare Centre building to be

used by 0-2 year old children with a maximum of two classrooms out at any time

(28 children).

• The outdoor play areas on Levels 1 and 2 of the Childcare Centre building are to

have a maximum capacity of 20 children and are not to be used simultaneously for

active play.

• Wall along the northern side of the outdoor play areas on Levels 1 and 2 of the

Childcare Centre.

• The ground level outdoor play area to the west of the Childcare Centre is not to be

used whilst active play is occurring in the outdoor play areas on Levels 1 and 2 of

the Childcare Centre building.

• Active play on the roof deck is restricted to the south-eastern corner of the roof

• 2 metre high vertical barriers along the southern and eastern boundaries of the

In terms of the internal classrooms of the proposed Childcare Centre, the assessment of

noise emission and traffic noise intrusion reveals the following requirements:

• The western classroom on the northern façade of the ground floor level can operate

with windows open. The windows for the other classrooms/cotrooms are required

to be closed when in use.

• Mechanical ventilation to the classrooms/cotroom that require doors/windows

closed when in use.

• 6.38 mm thick laminated glazing for cotroom along southern façade of Childcare

Centre building.

• 5 mm thick glazing for southern windows of classroom in the south-eastern corner

of ground floor level.

• 10.5 mm thick laminated glazing (such as Viridian VLam Hush) for windows on

southern façade of Level 2.

• 6.38 mm thick laminated glazing for windows on eastern façade of Level 2.

The proposed barriers are illustrated in Appendix F.

The relevant operational requirements to address noise emission are to be incorporated

into the Plan of Management.

An assessment of the noise emission of vehicles on site found compliance with the EPA’s

intrusive noise criterion and the sleep arousal criterion.

An analysis of additional traffic generated by the Childcare Centre reveals the noise level

of the additional traffic is negligible in comparison the existing Leq level of road traffic noise

at the site and surrounding area.

The EPA requires the operation of the Childcare Centre to not exceed background +5 dB(A)

at the residential boundary. The noise emission from the Childcare Centre will be a

contribution of mechanical plant noise and noise from children.

From the daytime background levels that have been assigned to the existing residences

and the calculated noise emission level of children at the Childcare Centre, the noise target

for mechanical plant servicing the Childcare Centre has been set at 41 dB(A) at the

residential boundary to the north and 56 dB(A) at the residential boundary to the east.

With the noise control measures specified above, the proposed Childcare Centre and

residential development can be built and operated to satisfy the various acoustic criteria

applicable to the Development.

Yours faithfully,

THE ACOUSTIC GROUP PTY LTD

CHRISTOPHER Y. H. CHAN

Acoustical Assessment – Proposed Residential Development and Childcare Centre Appendix A1 Active Kids Pre School Centre of Excellence

APPENDIX A: Site and Measurement Locations

Acoustical Assessment – Proposed Residential Development and Childcare Centre Appendix A2 Active Kids Pre School Centre of Excellence

Attended Measurement Location Logger Location

Acoustical Assessment – Proposed Residential Development and Childcare Centre Appendix B1 Active Kids Pre School Centre of Excellence

APPENDIX B: Logger Results

Job Number: 47.4463.R2

Instrumentation: SVAN 957 21450

Logger Location: Rear Yard of 57 Henley Road

Free Field: yes

Monitoring Period:

7am - 6pm

Evening

6pm - 10pm

10pm - 7am

7am - 6pm

Evening

10pm - 7am

Friday 25 November 2016 * 47.1 39.1 * 56.3 53.5

Saturday 26 November 2016 47.0 44.8 39.1 56.6 55.7 52.4

Sunday 27 November 2016 47.2 43.0 34.9 56.8 55.9 53.1

Monday 28 November 2016 46.7 44.9 38.5 57.4 59.7 53.4

Tuesday 29 November 2016 49.7 44.5 41.4 57.6 57.8 54.6

RBL Median 47.1 44.8 39.1 - - -

Log Average - - - 57.1 57.4 53.5

7am - 10pm

10pm - 7amDay - Max Day - Min Night - Max Night - Min

Friday 25 November 2016 * 56.0 * * 58.7 51.1

Saturday 26 November 2016 58.9 54.9 60.2 56.6 57.6 50.8

Sunday 27 November 2016 59.1 55.6 60.4 56.8 60.2 49.0

Monday 28 November 2016 60.6 55.9 66.4 57.2 60.1 50.5

Tuesday 29 November 2016 60.1 57.1 64.1 56.6 62.0 52.4

Log Average 59.7 56.0 63.6 56.8 60.0 50.9

* indicates an incomplete set of data for a given time period

# Nighttime for a given day continues through to the following morning

TRAFFIC NOISE MONITORING RESULTS

DECCW's NSW Road Noise Policy 2011

Leq Ambient Noise Levels Leq 1 Hr Noise Levels

DayLeq Ambient Noise Levels L90 Background Noise Levels

BACKGROUND AND AMBIENT NOISE MONITORING RESULTS

NSW EPA's INDUSTRIAL NOISE POLICY , 2000

40 Hornsey Road, Homebush Childcare Centre

Friday 25 November 2016 to Wednesday 30 November 2016

Acoustical Assessment – Proposed Residential Development and Childcare Centre Appendix C1 Active Kids Pre School Centre of Excellence

APPENDIX C: Attended Measurement Results

Cursor: 07/12/2016 10:10:22 AM.900 - 10:10:23 AM.000 LAF =67.1 dB LASmax=65.9 dB

Location 1 - Fast Logged

10:04:00 AM 10:06:00 AM 10:08:00 AM 10:10:00 AM 10:12:00 AM 10:14:00 AM 10:16:00 AM

Cursor: 07/12/2016 10:26:56 AM.900 - 10:26:57 AM.000 LAF =54.8 dB LASmax=56.0 dB

Location 2 - Fast Logged

10:20:00 AM 10:22:00 AM 10:24:00 AM 10:26:00 AM 10:28:00 AM 10:30:00 AM 10:32:00 AM 10:34:00 AM

Acoustical Assessment – Proposed Residential Development and Childcare Centre Appendix C2 Active Kids Pre School Centre of Excellence

Location Parameter dB(A)

A-weighted Octave Band Centre Frequency (Hz)

31 63 125 250 500 1k 2k 4k 8k

Ambient L10 67 34 47 50 54 59 63 60 56 47

Ambient Leq 64 32 46 49 52 56 60 58 55 48

Ambient L90 52 24 36 40 40 42 45 44 46 35

Ambient L10 68 38 50 54 56 59 65 62 56 50

Ambient Leq 65 38 49 52 54 57 61 59 54 48

Ambient L90 55 26 38 41 43 46 50 48 42 37

Acoustical Assessment – Proposed Residential Development and Childcare Centre Appendix D1 Active Kids Pre School Centre of Excellence

APPENDIX D: Glazing Schedule

Unit Type Dining/Living Bedroom Ground Floor

1 Bedroom WPS WPS

2 Bedroom

Northern Façade: WPS

10.5 mm VLam Hush Eastern Façade: 6.38 mm laminated

Level 1

Studio WPS

1 Bedroom WPS WPS

1 Bedroom CR

10.5 mm VLam Hush Eastern Façade: 6.38 mm laminated

2 Bedroom Northern Façade: WPS

10.5 mm VLam Hush Western Façade: 6.38 mm laminated

Level 2

Studio WPS

1 Bedroom WPS WPS

1 Bedroom CR WPS 10.5 mm VLam Hush

2 Bedroom

10.5 mm VLam Hush Eastern/Western Façade: 6.38 mm laminated

Level 3

Studio WPS

1 Bedroom (Apartment 409) WPS WPS

1 Bedroom (Apartment 401) WPS 10.5 mm VLam Hush

1 Bedroom CR

6.38 mm laminated Eastern Façade: 6.38 mm laminated

2 Bedroom

Northern Façade: WPS With Balcony: 6.38 mm

laminated

Western Façade: 6.38 mm laminated

Without Balcony: 10.5 mm VLam Hush

Level 4

1 Bedroom CR WPS 6.38 mm laminated

3 Bedroom

Northern Façade: WPS Northern Façade: WPS

Western Façade: 6.38 mm laminated

Southern Façade: 6.38 mm laminated

WPS Weight Per Size

Acoustical Assessment – Proposed Residential Development and Childcare Centre Appendix E1 Active Kids Pre School Centre of Excellence

APPENDIX E: Analysis of Childcare Noise Emissions

Ground Level Source Location Assessment Location

Level 1 Source Location Assessment Location

Level 2

Level 3 Source Location Assessment Location

Active Play

18 19 20

Calculation to Assessment Location A Source Location 1 Source 9 children (0-2 years) Distance from Source to Receiver = 21.2 m Path Length Difference = 0.00 m

Description dB(A) A-weighted Octave Band Centre Frequency (Hz)

125 250 500 1k 2k 4k 8k

Source Lw 79 50 61 74 74 74 60 65

Distance Attenuation -34 -34 -34 -34 -34 -34 -34

SPL Contribution 44 15 26 39 39 39 25 30

Source Location 2 Source 9 children (0-2 years) Distance from Source to Receiver = 25.9 m Path Length Difference = 0.00 m

125 250 500 1k 2k 4k 8k

Source Lw 79 50 61 74 74 74 60 65

125 250 500 1k 2k 4k 8k

Source Lw 79 50 61 74 74 74 60 65

125 250 500 1k 2k 4k 8k

Source Lw 88 52 64 76 82 84 78 65

Barrier Attenuation -6 -8 -9 -12 -14 -17 -20

125 250 500 1k 2k 4k 8k

Source Lw 87 52 64 76 82 84 78 65

125 250 500 1k 2k 4k 8k

Source Lw (passive) 88 52 64 76 82 84 78 65

125 250 500 1k 2k 4k 8k

-6 -8 -9 -12 -15 -17 -20

125 250 500 1k 2k 4k 8k

SPL Contribution 27 -2 9 20 23 22 14 -2

125 250 500 1k 2k 4k 8k

Source Lw (active) 94 58 70 82 88 90 84 71

125 250 500 1k 2k 4k 8k

Source Lw (active) 94 58 70 82 88 90 84 71

Cumulative Levels to Assessment Location A

Outdoor

Source

Contribution dB(A)

125 250 500 1k 2k 4k 8k

Western Ground Level

1 44 15 26 39 39 39 25 30

2 42 13 24 37 37 37 23 28

3 41 12 23 36 36 36 22 27

Level 1 (active)

9 41 12 23 33 37 36 27 11

10 42 9 21 32 38 39 31 16

11 42 9 21 32 38 39 32 16

Level 2 (passive)

12 30 1 12 22 26 25 16 0

13 27 -2 9 20 23 22 14 -2

14 27 -2 9 19 23 22 13 -3

Roof (passive)

15 25 -1 9 18 22 20 11 -5

16 21 -5 5 14 17 16 7 -9

17 20 -5 4 13 16 15 6 -10

18 24 -2 8 17 20 19 10 -6

Roof (active)

19 33 8 17 26 29 28 19 3

20 32 7 16 25 28 27 18 2

Cumulative Contribution – Western Ground Level,

Level 2 (passive) and Roof 48 19 30 43 43 43 30 33

Cumulative Contribution – Level 1 (active), Level 2

(passive) and Roof 47 17 28 38 43 43 36 20

Calculation to Assessment Location B Source Location 6 Source 8 children (3-5 years) Distance from Source to Receiver = 32.0 m Path Length Difference = 0.00 m

125 250 500 1k 2k 4k 8k

Source Lw 88 53 65 77 83 85 79 66

125 250 500 1k 2k 4k 8k

Source Lw 89 54 66 78 84 86 80 67

125 250 500 1k 2k 4k 8k

Source Lw 89 54 66 78 84 86 80 67

125 250 500 1k 2k 4k 8k

Source Lw 94 58 70 82 88 90 84 71

125 250 500 1k 2k 4k 8k

Cumulative Levels to Assessment Location B Outdoor

Source

Contribution dB(A)

125 250 500 1k 2k 4k 8k

Eastern Ground Level

6 50 15 27 39 45 47 41 28

7 48 12 24 36 42 44 38 25

8 45 14 25 37 41 41 32 16

Roof (passive)

15 25 -1 9 18 21 20 11 -5

16 23 -2 7 16 19 18 9 -7

17 24 -2 8 17 20 19 10 -6

18 20 -6 4 13 16 15 6 -10

Roof (active)

19 35 9 19 28 31 30 21 5

20 35 10 19 28 31 30 21 5

Cumulative Contribution – Eastern Ground Level and

Roof 53 20 31 43 48 50 43 30

Cumulative Contribution –Roof

39 13 23 32 35 34 25 9

Calculation to Assessment Location C – eastern façade of proposed residential building (Level 3) Source Location 1 Source 9 children (0-2 years) Distance from Source to Receiver = 17.4 m Path Length Difference = 0.00 m

125 250 500 1k 2k 4k 8k

Source Lw 79 50 61 74 74 74 60 65

125 250 500 1k 2k 4k 8k

Source Lw 79 50 61 74 74 74 60 65

125 250 500 1k 2k 4k 8k

Source Lw 79 50 61 74 74 74 60 65

125 250 500 1k 2k 4k 8k

Source Lw 87 52 64 76 82 84 78 65

125 250 500 1k 2k 4k 8k

Source Lw 88 52 64 76 82 84 78 65

125 250 500 1k 2k 4k 8k

Source Lw 88 52 64 76 82 84 78 65

125 250 500 1k 2k 4k 8k

Source Lw (active) 94 58 70 82 88 90 84 71

125 250 500 1k 2k 4k 8k

Source Lw (active) 94 58 70 82 88 90 84 71

Cumulative Levels to Western Residential Building (Level 3)

Outdoor

Source

Contribution dB(A)

125 250 500 1k 2k 4k 8k

Western Ground Level

1 46 17 28 41 41 41 27 32

2 46 17 28 41 41 41 27 32

3 46 16 27 40 40 40 26 31

Level 1 (passive)

9 45 9 21 33 39 41 35 22

10 45 10 22 34 40 42 36 23

11 44 9 21 33 39 41 35 22

Level 2 (active)

12 55 20 32 44 50 52 46 33

13 56 20 32 44 50 52 46 33

14 55 20 32 44 50 52 46 33

Roof (passive)

15 46 11 23 35 41 43 37 24

16 31 2 13 24 27 7 18 2

17 32 0 12 23 28 28 20 4

18 47 12 24 36 42 44 38 25

Roof (active)

19 42 15 26 35 38 38 29 13

20 45 15 26 37 41 41 32 16

Cumulative Contribution – Western Ground Level,

Level 1 (passive) and Roof 55 24 35 48 50 51 44 37

Cumulative Contribution – Level 1 (passive), Level 2

(active) and Roof 61 26 38 50 56 58 52 39

Calculation to Eastern Residential Receiver Source Location 4 Source 18 children (3-5 years) Distance from Source to Receiver = 54.6 m Path Length Difference = 0.00 m

125 250 500 1k 2k 4k 8k

Source Lw 92 57 69 81 87 89 83 70

125 250 500 1k 2k 4k 8k

Source Lw 92 57 69 81 87 89 83 70

125 250 500 1k 2k 4k 8k

Source Lw 88 53 65 77 83 85 79 66

125 250 500 1k 2k 4k 8k

Source Lw 89 54 66 78 84 86 80 67

125 250 500 1k 2k 4k 8k

Source Lw 89 54 66 78 84 86 80 67

125 250 500 1k 2k 4k 8k

Barrier Attenuation -8 -10 -12 -15 18 -21 -24

Source Location 16

Source 9 children (3-5 years) Distance from Source to Receiver = 51.9 m Path Length Difference = 0.31 m

125 250 500 1k 2k 4k 8k

Source Location 19

Source 28 children (3-5 years) Distance from Source to Receiver = 51.9 m Path Length Difference = 0.08 m

125 250 500 1k 2k 4k 8k

Source Lw 94 58 70 82 88 90 84 71

125 250 500 1k 2k 4k 8k

Source Lw 94 58 70 82 88 90 84 71

Cumulative Levels to Eastern Residential Receiver

Outdoor

Source

Contribution dB(A)

125 250 500 1k 2k 4k 8k

Southern Ground Level

4 49 41 26 38 44 46 40 27

5 51 15 27 39 45 47 41 28

Eastern Ground Level

6 50 15 27 39 45 47 41 28

7 51 16 28 40 46 48 42 29

8 48 16 27 39 44 44 36 20

Roof (passive)

15 19 -8 2 12 15 14 5 -11

16 20 -7 3 13 16 15 6 -10

17 19 -7 2 12 15 14 5 -11

18 17 -9 1 10 13 12 3 -13

Roof (active)

19 40 10 21 32 36 35 26 10

20 41 12 23 33 38 37 28 12

Cumulative Contribution 57 41 35 46 52 54 47 34

Acoustical Assessment – Proposed Residential Development and Childcare Centre Appendix F1 Active Kids Pre School Centre of Excellence

APPENDIX F: Proposed Barriers

Ground Level

Level 1

Level 2

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