PACIFIC NATIONAL SPOTSWOOD MAINTENANCE ... - Hobsons Bay

Marshall Day Acoustics Pty Ltd 

A.C.N. 006 675 403 

6 Gipps Street 

Collingwood 3066 

Victoria Australia 

Telephone: +61 3 9416 1855 

Facsimile : +61 3 9416 1231 

mdamelb@marshallday.com.au 

www.marshallday.com 

REPORT No.: 

2006232 001 R05 

PROJECT: 

PACIFIC NATIONAL SPOTSWOOD MAINTENANCE CENTRE 

PLANNING SCHEME AMENDMENT C33 

PRECINCTS 16 AND 17 NOISE ASSESSMENT 

CLIENT: 

Clayton Utz 

333 Collins Street 

Melbourne Vic 3000 

ATTENTION: 

Ms Megan Schroor 

DATE: 28 February 2007 

MARSHALL DAY ACOUSTICS 

Peter Fearnside 

Managing Director 

Christophe Delaire 

Consultant 

ISO 9001 

Lic QEC23174 

SAI Global

TABLE OF CONTENTS 

Page No. 

1.0 INTRODUCTION ....................................................................................................................................................................1 

2.0 SITE DESCRIPTION...............................................................................................................................................................1 

2.1 Site location 

2.2 Site operations 

2.3 Planning scheme zoning 

2.4 Planning Amendment C33 

3.0 NOISE CONSIDERATIONS ..................................................................................................................................................3 

4.0 NOISE ASSESSMENT CRITERIA ........................................................................................................................................4 

4.1 SEPP N-1 

4.2 Sleep disturbance 

5.0 NOISE MEASUREMENTS....................................................................................................................................................5 

5.1 Background noise levels 

5.2 SMC noise emissions 

6.0 NOISE ASSESSMENT...........................................................................................................................................................7 

6.1 Precinct 16 - Current conditions 

6.2 Precinct 16 - Future conditions 

6.3 Precinct 17 

7.0 NOISE CONTROL OPTIONS ................................................................................................................................................12 

7.1 SEPP N-1 – Precinct 16 



8.0 CONCLUSIONS......................................................................................................................................................................14 

APPENDIX A 

APPENDIX B 

APPENDIX C 

APPENDIX D 

APPENDIX E 

ACOUSTIC TERMINOLOGY 

SITE AERIAL PHOTOGRAPH 

SMC OPERATIONS PROVIDED BY PACIFIC NATIONAL 

PRECINCT 16 - NOISE CONTOURS 

PRECINCT 17 - NOISE CONTOURS

1.0 INTRODUCTION 

The Pacific National Spotswood Maintenance Centre (SMC) operates from 

561-569 Melbourne Road, Spotswood. The facility provides engineering maintenance 

services to Pacific National 24 hours per day, 365 days per year. 

Marshall Day Acoustics Pty Ltd has been commissioned by Clayton Utz, on behalf of 

Pacific National, to provide an assessment of the acoustic implications of the proposed 

Planning Scheme Amendment C33 on the SMC operations at Spotswood. 

As part of the Planning Scheme Amendment C33, it is proposed to incorporate the 

Hobsons Bay Industrial Land Management Strategy dated 2006 into the Planning 

Scheme. This would provide a strategic basis to rezone an adjacent parcel of land to 

the south of the existing rail line known as Precinct 16, currently zoned Industrial Use 

3 (IN3Z), to Residential 1 Use (R1Z). This triangular shaped parcel of land is generally 

bounded by Stephenson Street to the west and Blackshaws Road to the south. 

The Planning Scheme Amendment C33 also identifies an adjacent parcel of land to the 

north-east of the SMC site known as part Precinct 17 as a strategic redevelopment 

site, which could potentially be used for residential development. This triangular 

shaped parcel of land is bounded by Birmingham Street to the north, Melbourne Road 

to the east and the SMC site to the south. 

Any future residential development within Precincts 16 and 17 may affect operations 

at the SMC site by constraining allowable noise emissions. 

Acoustic terminology used throughout this report is detailed in Appendix A. 

2.0 SITE DESCRIPTION 

2.1 Site location 

The SMC site is located at 561-569 Melbourne Road, Spotswood and is bounded by the 

following: 

• Residential properties across Birmingham Street to the north 

• Residential properties across Birmingham Street beyond disused land (Precinct 17) 

to the north-east 

• Melbourne Road to the east 

• Residential properties along Blackshaws Road across the railway line and beyond 

disused land (Precinct 16) to the south 

• Industrial properties to the west. 

S:\Project\2006\2006232ML\RP 001 R05 0228 - SMC noise impact assessment - FINAL.doc 1

2.2 Site operations 

The SMC is a facility of national significance that maintains all 120 premium NR Class 

locomotives in Australia, with one locomotive scheduled for service daily in addition to 

breakdowns and repairs to NR locomotives. Works occur on site 24 hours a day, 7 days 

a week and 365 days per year. 

Locomotives arriving at the site enter from the north-western corner directly from the 

freight train line. The locomotives stand at the north-western corner of the site and 

wait for a systematic changeover to occur. It is common for a second locomotive to be 

waiting, idling on the exit line adjacent to the railway line, after its routine service 

and/or repair, washing and testing has been completed. 

The SMC employs staff on 12 hour shifts from 0800-2000hrs (8:00am-8:00pm) and 

2000-0800hrs (8:00pm-8:00am). 

The site consists of three buildings as follows: 

• The main building located to the east of the site includes the Main Workshop, the 

boiler room and administration offices. The Main Workshop can accommodate up 

to 6 locomotives at any one time 

• The shed located to the north of the site is the Wash Facility where locomotives are 

cleaned after maintenance 

• The shed located to the west of the site is the Load Test Cell. The locomotives are 

tested in this shed before and after maintenance. 

Occasionally, locomotives are also tested outside the Load Test Cell, usually to the 

south of the Wash Facility and/or to the south and west of the Main Workshop. 

However, it is our understanding that these outdoor tests do not occur after 2000hrs 

(8:00pm). 

An aerial photograph of the site is provided in Appendix B. 

2.3 Planning scheme zoning 

The SMC site, including the vehicle access way, is zoned Industrial 1 (IN1Z). 

The vacant land to the north is presently zoned Mixed Use (MUZ) and beyond this, 

from the north side of Birmingham Street extending as far as the northern municipal 

boundary at the Westgate Freeway, the land is included in a Residential 1 Zone (R1Z). 

The railway land abutting the south-western boundary of the site is zoned Public Use 4 

(Transport). Land immediately abutting the railway land to the southern side of the site 

on either side of Sutton Street extending west to Stephenson Street is zoned Industrial 

3 (IN3Z) except for a small pocket of Residential 1 zoned land that abuts the northern 

side of Blackshaws Road and the southern end of the east side of Stephenson Street. 


Figure 1: Zoning surrounding the SMC site 

2.4 Planning Amendment C33 

Precinct 16 is a large site that is included in an Industrial 3 Zone located to the south 

west of the SMC site, separated only by the heavily used east/west freight rail line. 

Part of the land, known as the former Caltex site, is currently undergoing 

rehabilitation. 

The Planning Scheme Amendment C33 proposes the incorporation of the Council 

revised Industrial Land Management Strategy dated 2006 which seeks to provide a 

strategic basis for rezoning Precinct 16 (identified as a Strategic Development Area) 

from an Industrial 3 Zone to a Residential 1 Zone. 

Pursuant to the revised Hobson’s Bay Industrial Land Management Strategy dated 

October 2006, that part of Precinct 17 which is currently included in a mixed Use Zone 

is to maintain its current zoning. However, any viable use of the site is to recognise 

and support the ongoing use of the SMC and provide for noise buffers and attenuation 

measures. 

3.0 NOISE CONSIDERATIONS 

Noise emissions from the SMC facility are governed by permissible noise limits set 

under State Environment Protection Policy (Control of Noise from Commerce, Industry 

and Trade) No. N-1 (SEPP N-1). Compliance with SEPP N-1 is mandatory in the State 

of Victoria. 


The potential development of residential properties closer to or even adjacent to the 

SMC site introduces a new noise-sensitive area and the SMC will be obliged to meet 

the noise limits set by SEPP N-1 at these new properties. Currently, the restrictions 

placed on the maintenance facility are minor and do not restrict the operations of the 

facility. 

If any residential development were to proceed, it is possible that the noise emissions 

from the SMC site may significantly exceed the SEPP N-1 noise limits at any 

residential property. If the exceedance was significant, this would require the SMC to 

dramatically alter their operations or install extensive and expensive noise control 

treatments to ensure compliance with SEPP N-1. 

The purpose of this study is to determine whether the SEPP N-1 noise limits would be 

achieved at residential properties within Precinct 16 if it was to be rezoned as a 

Residential 1 Zone. 

A further purpose of this study is to determine any extent on any buffer which ought 

to be provided on that part of Precinct 17 to the north-east, in recognition of the 

ongoing use of the SMC as a significant industrial site. 

4.0 NOISE ASSESSMENT CRITERIA 

4.1 SEPP N-1 

State Environment Protection Policy (Control of Noise from Commerce, Industry and 

Trade) No. N-1 (SEPP N-1) provides criteria for control of noise in the Melbourne 

metropolitan area for industrial and commercial premises. 

SEPP N-1 also covers noise emissions from commercial vehicles (such as trains and 

forklifts) associated with the facility when moving within the site. 

The assessment of noise emissions under SEPP N-1 is based on the calculation of a 

noise limit at a receiver position, taking into account the land use in the surrounding 

area and the ambient noise level. Once a noise limit is established, the noise emission 

is predicted. The noise emission from the site, when corrected for duration and 

character, is referred to as the 'effective noise level'. The predicted effective noise 

level is compared to the noise limit to determine if noise controls are required to 

comply with SEPP N-1. The effective noise level (L eff 

) is the adjusted Leq 

of the noise 

source or sources measured over a 30 minute period. 

The calculation of noise limits requires the calculation of a zoning level which is based 

on land use in the surrounding area. The zoning level is then adjusted appropriately, 

depending on the background noise level. 

SEPP N-1 separates the day into three different time periods - day, evening and night 

which are shown in Table 1. 


Table 1 

SEPP N-1 time periods 

Period Day of week Time period 

Day Monday-Friday 0700-1800hrs 

Saturday 0700-1300hrs 

Evening Monday-Friday 1800-2200hrs 

Saturday 1300-2200hrs 

Sunday, Public 0700-2200hrs 

Holidays 

Night Monday-Sunday 2200-0700hrs 


Night-time noise emissions from the SMC may cause awakening reactions. When 

intrusive noise reaches certain levels largely independent of background noise, there is 

a potential for disturbance of sleep and possibly awakening if these activities occur 

during the night period between 2200-0700hrs (10:00pm-7:00am). 

A document published in May 1999 by the NSW EPA entitled Environmental Criteria 

for Road Traffic Noise has compared a number of sleep disturbance criteria and 

concluded the following: 

• Maximum internal noise levels below 50-55dBA are unlikely to cause awakening 

reactions 

• One or two noise events per night, with maximum internal noise levels of 65- 

70dBA, are not likely to affect health and well-being significantly. 

Based on these NSW EPA findings, a noise level of 60-65dBA outside an open bedroom 

window would be unlikely to cause awakening reactions. 

5.0 NOISE MEASUREMENTS 

5.1 Background noise levels 

Background noise levels were measured at 13 Brunel Street, Spotswood. This location 

was chosen as representative of the nearest affected residential properties where 

ambient noise levels were not affected by any commercial or industrial noise 

emissions. Measured background noise levels are detailed in Table 2. 

Table 2 

Background noise levels 

Period Date Time Background noise level 

Day 6 October 2006 1430-1500hrs (2:30-3:00pm) 44dBA 

Evening 6 October 2006 2000-2030hrs (8:00-8:30pm) 46dBA 

Night 4 November 2006 0015-0045hrs (12:15-12:45am) 40dBA 


The SEPP N-1 noise limits at any future residential properties to the south of the SMC 

site in Precinct 16 have been calculated based on this land being rezoned residential 

and are presented in Table 3. 

Table 3 

SEPP N-1 noise limits (based on land rezoned to residential) – South of SMC site 

Period Zoning level Background 

noise level 

Noise limit 

Day 52dBA 44dBA 52dBA 

Evening 46dBA 46dBA 49dBA 

Night 41dBA 40dBA 43dBA 

The SEPP N-1 noise limits at any future residential properties to the north of the SMC 

site in Precinct 17 based on the current zoning (mixed use zone) have been calculated 

and are presented in Table 4. 

Table 4 

SEPP N-1 noise limits (based on current zoning) – North of SMC site 

Period Zoning level Background 

noise level 

Noise limit 

Day 56dBA 44dBA 56dBA 

Evening 49dBA 46dBA 49dBA 

Night 44dBA 40dBA 44dBA 

5.2 SMC noise emissions 

An extensive noise survey of the activities at the SMC site was undertaken on 30 

August 2006 between 1100-1230hrs (11:00am-12:30pm). The results of this survey 

are presented in Table 5. 


Table 5 

SMC site activities noise emissions 

Description Distance Noise level, 

L eq 

Noise level, 

L max 

Comments 

Stationary locomotive 

Notch 4 

30m 80dBA 87dBA 

Stationary locomotive 


Notch 8 

Pass-by locomotive 


at low speed 

Locomotive horn 17m - 105dBA Used when a locomotive 

enters or exits a shed 

Locomotive in Test Cell 


Notch 8, Doors open 

Test Cell A/C louvres 15m 66dBA 68dBA 

Washing compressor in 


Wash Facility 

Roller door alarm 2m 79dBA 81dBA Operates for a maximum 

of 3 minutes 

Forklift pass-by 5m 80dBA 86dBA 

6.0 NOISE ASSESSMENT 

Noise emissions from the SMC site at Precincts 16 and 17 were predicted using the 

proprietary sound level prediction software SoundPlan with the CONCAWE method. 

The CONCAWE method was originally described in The Propagation of Noise from 

Petroleum and Petrochemical Complexes to Neighbouring Communities (1981). While 

developed for the petrochemical industry, the method is generally applicable to 

environmental noise propagation. 

Environmental parameters such as temperature, wind speed and direction, fog and 

temperature inversions significantly influence the propagation of noise. The 

CONCAWE method deals explicitly with the influence of wind and the stability of the 

atmosphere. Neutral weather conditions (calm with no temperature inversions) were 

considered. 

For the purpose of the noise modelling, Pacific National has provided different 

scenarios for current and potential future operations of the SMC. These scenarios are 

detailed in a letter from Pacific National to Clayton Utz dated 31 January 2007 and 

presented in Appendix C. 

The scenarios are summarized in Table 6. All operations presented in Table 6 operate 

for a 30 minute period unless otherwise stated. 


Table 6 

SMC operations scenarios provided by Pacific National 

Noise source 

All roller-door alarms to run 

once each for 3 minutes 

Half of the roller-door alarms 

to run once each for 3 

minutes 

One locomotive at Notch 8 in 

the operating Load Test Cell 

with doors closed 

One locomotive travelling 

from the Main Workshop to 

the north west of the site 

passing between the Load 

Test Cell and the Washing 

Facility 

Current operations 

Typical 

daily 

operation 

Day/evening shift 

One 

occurrence 

per month 

Potential future 

operations 

Typical 

daily 

operation 

One 

occurrence 

per month 

 

Evening/night 

shift 

 

 

 


Noise source 

One locomotive travelling 

from the Main Workshop to 

the north west of the site 

passing between the Load 

Test Cell and the Washing 

Facility 

One forklift moving 

continuously in the loading 

area to the south east of the 

Main Workshop 

Washing compressor 

operating in the Washing 

Facility 

One stationary locomotive at 

Notch 8 to the south of the 

Wash Facility 

One stationary locomotive at 

Notch 8 to the south of the 

Main Workshop 

Current operations 

Typical 

daily 

operation 

Day/evening shift 

One 

occurrence 

per month 

Potential future 

operations 

Typical 

daily 

operation 

One 

occurrence 

per month 

 

 

Evening/night 

shift 

 

 

15 minutes 

 

 

 

For all scenarios, noise emissions from general maintenance work within the Main 

Workshop have been considered negligible compared to the other noise sources. 

6.1 Precinct 16 - Current conditions 

Predicted noise levels throughout Precinct 16 for the current conditions are presented 

in Table 7 for the Day/Evening and Evening/Night shifts. 

Table 7 

Precinct 16 predicted noise levels – Current conditions 

Shift 

Predicted noise 

levels at residences 

Applicable SEPP N-1 

noise limit 

Compliance 

Exceedance 

Day/Evening 

Typical daily operation 

34-52dBA 49dBA No Up to 3dBA 

Day/Evening 

One occurrence per month 


Evening/Night 32-50dBA 43dBA No Up to 7dBA 

Noise contours for the current conditions are presented in Figures D1 to D3 of 

Appendix D. 


Sleep disturbance 

Maximum noise emissions from the night activities at the SMC site have been 

predicted at Precinct 16 and are presented in Table 8 together with the NSW EPA sleep 

disturbance criteria. 

Table 8 

Maximum predicted noise levels in Precinct 16 

Description 



NSW EPA sleep 

disturbance criteria 

Compliance 

Exceedance 

Locomotive horn 75-96dBA 60-65dBA No Up to 36dB 

Locomotive movement 53-82dBA 60-65dBA No Up to 17dBA 

Roller door alarm

Predicted noise levels throughout Precinct 16 for the future conditions are presented 

in Table 10 for the Day/Evening and Evening/Night shifts. 

Table 10 

Precinct 16 predicted noise levels – Future conditions 

Shift 




noise limit 

Compliance 

Exceedance 

Day/Evening 



Day/Evening 




Noise contours for the future day/evening and evening/night shifts are presented in 

Figures D3 to D5 of Appendix D. 


Maximum noise levels for the future conditions will be the same as those predicted for 

the current conditions (See Table 8). 

6.3 Precinct 17 

Predicted noise levels throughout Precinct 17 for the current and future conditions are 

presented in Table 11 for the Day/Evening and Evening/Night shifts. 

Table 11 

Precinct 17 predicted noise levels 

Shift 




noise limit 

Compliance 

Exceedance 

Current conditions 

Day/Evening 



Day/Evening 




Potential future conditions 

Day/Evening 



Day/Evening 




Noise contours for the current conditions are presented in Figures E1 to E5 of 

Appendix E. 



Maximum noise levels predicted for Precinct 17 are similar to those predicted for 

Precinct 16 (See Table 8). 

7.0 NOISE CONTROL OPTIONS 


If Precinct 16 is rezoned Residential 1 (R1Z), noise emissions from the SMC site will 

significantly exceed both the SEPP N-1 and sleep disturbance criteria, based on 

scenarios provided by Pacific National. 

To reduce the noise impact to Precinct 16, the effect of the installation of a 7m high 

noise barrier to the southern boundary of the maintenance centre has been 

investigated. 

Based on the installation of a 7m high noise barrier, noise levels throughout Precinct 

16 have been predicted and are presented in Table 12. 

Table 12 

Precinct 16 predicted noise levels with the installation of a 7m high noise barrier 

Shift 




noise limit 

Compliance 

Exceedance 


Day/Evening 


28-39dBA 49dBA Yes - 

Day/Evening 



Evening/Night 25-39dBA 43dBA Yes - 


Day/Evening 



Day/Evening 




It can be seen from Table 12 that it is possible to achieve the SEPP N-1 noise limits for 

both the day/evening and evening/night shifts for the current typical daily operation 

throughout Precinct 16 with the installation of a noise barrier with a minimum height 

of 7m. 

The 7m high noise barrier does not allow the SEPP N-1 limits to be achieved for the 

potential future conditions day/evening shift and the current operation occurring once 

a month. Additional measures that would involve major changes to the operations of 

the SMC site would be required to achieve the SEPP N-1 limits for these conditions. 


Noise contours of predicted noise levels in Precinct 16 with the installation of a 7m 

high noise barrier are presented in Figures D6 to D10 of Appendix D. 


Noise emissions from the SMC site will significantly exceed both the SEPP N-1 and 

sleep disturbance criteria throughout Precinct 17, based on scenarios provided by 

Pacific National. 

To reduce the noise impact to Precinct 17, the effect of the installation of 7m high 

noise barrier to the northern boundary of the maintenance centre has been 

investigated. 

Based on the installation of a 7m high noise barrier, noise levels throughout Precinct 

17 have been predicted and are presented in Table 13. 

Table 13 

Precinct 17 predicted noise levels with the installation of a 7m high noise barrier 

Shift 




noise limit 

Compliance 

Exceedance 


Day/Evening 


26-35dBA 49dBA Yes - 

Day/Evening 





Day/Evening 



Day/Evening 




It can be seen from Table 13 that it is possible to achieve the SEPP N-1 noise limits for 

both the day/evening and evening/night shifts for the current typical daily operation 

throughout Precinct 17 with the installation of a noise barrier with a minimum height 

of 7m. 

The 7m high noise barrier does not allow the SEPP N-1 limits to be achieved for the 

potential future conditions day/evening shift and the current operation occurring once 

a month. Additional measures that would involve major changes to the operations of 

the SMC site would be required to achieve the SEPP N-1 limits for these conditions. 

Noise contours of predicted noise levels in Precinct 17 with the installation of a 7m 

high noise barrier are presented in Figures E6 to E10 of Appendix E. 



Maximum noise emissions from the night activities at the SMC site with the 

installation of the 7m high acoustic barrier have been predicted at Precincts 16 and 17 

and are presented in Table 14 together with the NSW EPA sleep disturbance criteria. 

Table 14 

Maximum predicted noise levels in Precincts 16 and 17 with the installation of a 

7m high noise barrier 

Description 

Predicted noise levels 

at residences 

NSW EPA sleep 

disturbance criteria 

Compliance 

Exceedance 

Locomotive horn 64-83dBA 60-65dBA No Up to 18dB 

Locomotive movement 38-62dBA 60-65dBA Yes - 

Roller door alarm

The Planning Scheme Amendment C33 also identifies an adjacent parcel of land to the 

north east of the SMC site known as Precinct 17 as a strategic redevelopment site and 

could potentially be used for residential development. 

• Any future residential development within Precincts 16 and 17 will affect 

operations at the SMC site by constraining allowable noise emissions. 

• Based on operation scenarios provided by Pacific National, development of Precincts 

16 and 17 for residential purposes will result in noise emissions from the SMC to 

significantly exceed the SEPP N-1 and sleep disturbance criteria. 

• The installation of a 7m high noise barrier to the southern and northern boundaries 

of the SMC will reduce noise emissions to potential residential properties in 

Precincts 16 and 17. With the installation of the noise barrier the SEPP N-1 noise 

limits would be achieved for the current typical daily operation during both the 

day/evening and evening/night shifts, but will be exceeded during the day/evening 

shift for both current operations and potential future conditions occurring once per 

month. 

• The installation of a 7m high noise barrier would reduce maximum noise levels from 

the SMC site by up to 13dBA but is not sufficient to achieve the NSW EPA sleep 

disturbance criteria throughout Precincts 16 and 17 for all the SMC operations. 

• To achieve the SEPP N-1 noise limits and sleep disturbance criteria at all times 

throughout Precincts 16 and 17, additional measures involving major changes to 

the operations of the SMC site would be required. 


APPENDIX A 

ACOUSTIC TERMINOLOGY 

dBA 

L eq 

L 

Aeq 

Unit of overall noise level, in A-weighted decibels. The A-weighting 

approximates the average human response over the entire frequency range. 

Continuous or semi-continuous noise levels are described in terms of the 

equivalent continuous sound level (L 

eq 

). This is the constant sound level over a 

stated time period which is equivalent in total sound energy to the timevarying 

sound level measured over the same time period. This is commonly 

referred to as the average noise level and is generally measured in dBA. 

The “A” weighted equivalent continuous sound level. 

L 

max 

The maximum noise level (L 

max 

) is defined as the highest noise level which 

occurs during any noise event occurring over a particular time period. This is 

generally measured in dBA. 

L 

90 

Background noise levels are described in terms of the level exceeded for 90% 

of the measurement period (L 

90 

). This is commonly referred to as the typical 

minimum level and is generally measured in dBA.

APPENDIX B 

SITE AERIAL PHOTOGRAPH

APPENDIX C 

SMC OPERATIONS PROVIDED BY PACIFIC NATIONAL

APPENDIX D 

PRECINCT 16 - NOISE CONTOURS 

Please note that scales are different throughout the contours due to the wide range of noise 

levels.

Figure D1 - Day/Evening shift – Current conditions – Typical daily operation 

Figure D2 - Day/Evening shift – Current conditions – One occurrence per month

Figure D3 - Evening/Night shift 

Figure D4 - Day/Evening shift – Potential future conditions – Typical daily operation

Figure D5 - Day/Evening shift – Potential future conditions – One occurrence per month 

Figure D6 - Day/Evening shift – Current conditions – Typical daily operation 

with the installation of a 7m noise barrier

Figure D7 - Day/Evening shift – Current conditions – One occurrence per month 

with the installation of a 7m noise barrier 

Figure D8 - Evening/Night shift with the installation of a 7m noise barrier

PACIFIC NATIONAL SPOTSWOOD MAINTENANCE ... - Hobsons Bay

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