Lot 12 Honeywood Ave, Wandi Traffic Noise Assessment Report

Transcription

1 Lot 12 Honeywood Ave, Wandi Traffic Noise Assessment Report Wandi Developments Pty Ltd c/- Terranovis 11 February 2014 Revision No. 1 Prepared by Andreas Lejholm Project Number: PER-N Ground Floor, 226 Adelaide Terrace, Perth WA 6000 Phone (08) Fax (08) perth@wge.com.au Web WGE - vital experience Albany Brisbane Busselton Darwin Melbourne Perth Shenzhen Sydney

2 Revision REVISION DATE COMMENT APPROVED BY 0 18/12/2013 For comments DCC 1 11/02/2014 For comments ALEJ REVISION

3 Contents 1. INTRODUCTION STATE PLANNING POLICY NOISE CRITERIA MITIGATION MEASURES NOTIFICATION ON TITLE REASONABLE AND PRACTICABLE MEASURES ASSESSMENT MEASUREMENT NOISE MODELLING NOISE MODELLING RESULT AND DISCUSSION CONCLUSION APPENDIX A GLOSSARY OF ACOUSTIC TERMINOLOGY APPENDIX B MEASUREMENT RESULT APPENDIX C PACKAGE A: NOISE LEVELS WITHIN THE MARGIN APPENDIX D PACKAGE B: NOISE WITHIN 3DB ABOVE THE LIMIT APPENDIX E IMPROVED PERFORMANCE PACKAGE : NOISE BETWEEN 3DB AND 5DB ABOVE THE LIMIT CONTENTS i

4 1. Introduction This Traffic Noise Assessment Report has been prepared at the request of Terranovis for the development of Lot 12 Honeywood Avenue, Wandi. The development is located adjacent to the Kwinana Freeway (and railway) and a traffic noise assessment has been undertaken to determine future expected noise levels as well as potential mitigation measures required. The aim of the assessment is to: Address the requirement of State Planning Policy 5.4 Road and Rail Transport Noise and Freight Considerations in Land Use Planning and define the noise criteria for the proposed residential area along the nominated road. Undertake a detailed traffic noise assessment and determine noise levels of the future residential area. Provide advice relating to appropriate noise mitigation measures required to meet the noise level objectives. Figure 1 shows the proposed subdivision plan with the proposed development. Figure 1: Proposed subdivision plan The acoustic terms used in this report are explained in Appendix A. INTRODUCTION 1

5 2. State Planning Policy 5.4 The noise criterion for the development is set out in the State Planning Policy 5.4: Road and Rail Transport noise and Freight Considerations in Land Use (referred to as the policy in the remainder of this document). The details below are taken from the policy. The aim of the policy is to provide a standardised and consisted triple bottom line framework for the consideration and management of the impacts of transport noise and freight operations when dealing with New noise-sensitive development in the vicinity of existing or future major transport corridors or freight handling facilities; New major road or rail infrastructure projects, including major redevelopments, in the vicinity of existing or future noise-sensitive land uses; and The location of freight handling facilities. 2.1 Noise Criteria The outdoor noise criterion applies to the emission of road and rail transport noise as received at the noise-sensitive land locations. The noise criteria apply at the following locations: For new road or rail infrastructure proposals, at 1 m from the most exposed, habitable façade of the building receiving the noise, at ground floor level only; and For new noise-sensitive development proposals, at 1 m from the most exposed, habitable façade of the proposed building, at each floor level, and within at least one outdoor living area on each residential lot. The outdoor noise criteria can be found in Table 1. Table 1: Outdoor noise criteria Time of day Noise Target Noise Limit Day (6 am 10 pm) L Aeq(Day) 55 db(a) L Aeq(Day) 60 db(a) Night (10 pm 6 am) L Aeq(Night) 50 db(a) L Aeq(Night) 55 db(a) In most situations in which either the noise-sensitive land use or the major road or railway already exists, it should be practicable to achieve outdoor noise levels within this acceptable margin. In relation to greenfield sites, however, there is an expectation that the design of the proposal will be consistent with the target ultimately being achieved. The noise criteria were developed after consideration for road and rail transport noise criteria in Australia and overseas, and after a series of case studies to assess whether the levels were practicable. In the application of these outdoor noise criteria to new noise-sensitive developments, the objective of the policy is to achieve: Acceptable indoor noise levels in noise-sensitive areas (for example, bedrooms and living rooms of houses, and school classrooms); and A reasonable degree of acoustic amenity in at least one outdoor living area on each residential lot 1 If a noise-sensitive development takes place in an area where outdoor noise level will meet the noise target, no further measures are required under the policy. In areas where the noise target is likely to be exceeded, but noise levels are likely to be within the 5 db margin, mitigation measures should be implemented by the developer with a view to achieving the target levels in at least one outdoor living area on each residential lot 1. Where indoor spaces are planned to be facing any outdoor area in the margin, noise mitigation measures should be implemented to achieve acceptable indoor noise levels in those spaces. In 1 For non-residential noise-sensitive developments (e.g. schools and child care centres) consideration should be given to providing a suitable outdoor area that achieves the noise target, where this is appropriate to the type of use. STATE PLANNING POLICY 5.4 2

6 this case, compliance with this policy can be achieved for residential buildings through implementation of the deemedto-comply measures detailed in the guidelines. In areas where the outdoor noise limit is likely to be exceeded (i.e. above L Aeq(Day) of 60dB(A) or L Aeq(Night) of 55dB(A)), a detailed noise assessment in accordance with the guidelines should be undertaken by the developer. Customised noise mitigation measures should be implemented with a view to achieving the noise target in at least one outdoor living or recreation area on each noise-sensitive lot or, if this is not practicable, within the margin. Where indoor spaces will face outdoor areas that are above the noise limit, mitigation measures should be implemented to achieve acceptable indoor noise levels in those spaces, as specified in the following paragraphs. For residential buildings, acceptable indoor noise levels are L Aeq(Day) of 40dB(A) in living and work areas and L Aeq(Night) of 35dB(A) in bedrooms 2. For all other noise-sensitive buildings, acceptable indoor noise levels under this policy comprise noise levels that meet the recommended design sound levels in Table 1 of Australian Standard AS 2107:2000 Acoustics Recommended design sound levels and reverberation times for building interiors. These requirements also apply in the case of new noise-sensitive developments in the vicinity of a major transport corridor where there is no existing railway or major road (bearing in mind the policy s year planning horizon). In these instances, the developer should engage in dialogue with the relevant infrastructure provider to develop a noise management plan to ascertain individual responsibilities, cost sharing arrangements and construction time frame. If the policy objectives for noise-sensitive developments are not achievable, best practicable measures should be implemented; refer to the policy for further details. 2.2 Mitigation Measures Possible noise management and mitigation measures provided in the policy A range of noise mitigation measures are available to meet the noise criteria. These include Using distance to separate noise-sensitive land uses from noise sources. Construction of noise attenuation barriers such as earth mounds and noise walls. Building design, such as locating outdoor living areas and indoor habitable rooms away from noise sources. Building construction techniques, such as upgraded glazing, ceiling insulation and sealing of air gaps. Note that where upgraded glazing is required, the benefit is only realised when windows are kept closed and, as such, mechanical ventilation should also be considered in these circumstances. Planning and design of the road or rail project such as construction in cut, traffic management or the use of low-noise road surfaces. The policy guidelines (ATTACHMENT 2 Implementation Guidelines for State Planning Policy 5.4 Road and Rail Transport Noise and Freight Considerations in Land Use Planning, referred to as the guidelines in the remainder of this document) provide more detail on the range of noise mitigation measures and their potential for noise reduction. It is expected that noise management and mitigation strategies will be identified and implemented through a noise management plan, having regard to the guidelines, and will be Effective in reducing noise. Practical and appropriate for the situation. Compatible with other relevant planning policies. 2.3 Notification on Title If the measures outlined previously cannot practicably achieve the target noise levels for new noise-sensitive developments, this should be notified on the certificate of title. 2 For residential buildings, indoor noise levels are not set for utility spaces such as bathrooms. This policy encourages effective quiet house design, which positions these non-sensitive spaces to shield the more sensitive spaces from transport noise (see the policy guidelines for further information). STATE PLANNING POLICY 5.4 3

7 Notifications on certificates of title and/or advice to prospective purchasers advising of the potential for noise impacts from major road and rail corridors can be effective in warning people who are sensitive to the potential impacts of transport noise. Such advice can also bring to the attention of prospective developers the need to reduce the impact of noise through sensitive design and construction of buildings and the location of outdoor living areas. The notification is to ensure that prospective purchasers are advised of The potential for transport noise impacts. The potential for quiet house design requirements to minimise noise intrusion through house layout and noise insulation (see the guidelines). Notification should be provided to prospective purchasers and be required as a condition of subdivision (including strata subdivision) for the purposes of noise-sensitive development as well as planning approval involving noise-sensitive development, where noise levels are forecast or estimated to exceed the target outdoor noise criteria, regardless of proposed noise attenuation measures. The requirement for notification as a condition of subdivision and the land area over which the notification requirement applies, should be identified in the noise management plan in accordance with the guidelines. An example of a suitable notice is given below. Notice: This lot is situated in the vicinity of a transport corridor and is currently affected, or may in the future be affected, by transport noise. Further information is available on request from the relevant local government offices. 2.4 Reasonable and practicable measures The policy applies a performance-based approach to the management and mitigation of transport noise. It is recognised that in a number of instances it may not be reasonable and practicable to meet the noise target criteria. Where transport noise is above the target level, measures are expected to be implemented that best balance reasonable and practicable considerations, such as noise benefit, cost, feasibility, community preferences, amenity impacts, safety, security and conflict with other planning and transport policies. In these cases the community should also be consulted to assist in identifying best overall solutions. The guidelines assist in outlining ways in which some reasonable and practicable limitations can be addressed in a manner that also minimises transport noise. It is further acknowledged that there may also be situations in which the noise limit cannot practicably be achieved, especially in the case of major redevelopment of existing transport infrastructure. Similarly, it may not be practicable to achieve acceptable indoor noise levels if the new development is located very close to the transport corridor. In these situations the primary focus should be on achieving the lowest level of noise, with other reasonable and practicable considerations being secondary to this objective. In cases where the noise limit or indoor noise criteria cannot practicably be met, longer term strategies for land use planning, transport policy and vehicle emissions should be considered to minimise transport noise impact over time. STATE PLANNING POLICY 5.4 4

8 3. Assessment 3.1 Measurement An unattended noise logger was deployed between the 14 th October and the 23 rd of October 2013 to monitor road and rail traffic noise. The L A1, L A10, L A90 and L Aeq levels were recorded for all measurements. The measurements were carried out in general compliance with the Australian Standard Acoustics Methods for the Measurement of Road Traffic Noise and Australian Standard Acoustics Methods for the Measurement of Railbound Vehicle Noise. Brief attended noise level measurements were further undertaken to validate the unattended noise logger result. The equipment used for the noise measurement complies with the requirements set out in the guideline and equipment details can be found in Table 2 below. Table 2: Equipment information Equipment Trojan Class 1 Environmental Noise Logger with Cirrus Optimus 199B Class 1 sound level meter Serial Number G MK:226 Class 1 microphone with preamp (Preamp 2337F) CR:515 Class 1 field calibrator The microphone was located at a height of 1.4 m above ground and there were no building in close proximity of the measurement location. The location of the measurement position was approximately 30 m from the road, see Figure 2 below for further information. Figure 2: Picture of the noise logger location N Source: Nearmap.com ASSESSMENT 5

9 The equipment was calibrated before and after the measurements and no significant drift was found. All equipment carries current traceable calibration certificates that can be provided upon request. The result from the measurement was averaged over the measurement period (for valid days) and summarised in Table 3 below. Detailed data from the noise measurements (15 minutes interval) can be found in Appendix B. Table 3: Unattended measurement result L A10,18hour L Aeq,16hour(Day) L Aeq, 8 hour(night) 64 db 61 db 56 db As the difference between the measured daytime and night time noise level is 5 db (same as the difference between daytime and night time noise criteria), either the daytime or the night time levels can be used for the assessment. We have decided to use daytime noise levels as basis for the assessment. Based on the result from the noise measurement it was possible to establish the existing noise level as well as determining the difference between the different parameters L A10,18hour, L Aeq,Day and L Aeq,Night. 3.2 Noise Modelling The noise modelling was carried out based on the guidelines and the software package SoundPLAN 7.1 was used to predict the required noise levels. The Calculation of Road Traffic Noise (CoRTN) algorithm was used for road traffic and the Nordic (Kilde Rep 130) algorithm was used for rail noise. A number of assumptions and corrections were used in the model based on the information provided in the guideline, see sections below for further details. The model was further calibrated based on the result from the noise measurement. Conversion between L A10,18hour and L Aeq,16hour /L Aeq, 8 hour The CoRTN algorithm calculates the L A10,18hour noise level, however, the WA outdoor noise criteria specified in the policy are defined in terms of L Aeq,16hour and L Aeq,8hour parameters and a conversion is therefore required. As direct noise measurements were taken of the existing roadway being investigated it was possible to determine the existing differences between the relevant noise parameters. It has been assumed that these differences will remain the same in the future. Table 4 shows the relationship between the different parameters. Table 4: Measured relationship between L A10,18hour and L Aeq,16hour /L Aeq,8hour L A10,18hour L Aeq,16hour L Aeq,8hour 64 db 61 db 56 db Façade correction When predicting transport noise level in accordance with the guideline, it is a general rule that a +2.5 db façade correction is to be applied for both road and rail. This correction has been included in the model. Traffic volumes/number of movements Traffic volumes for existing and future road traffic volumes have been obtained from Main Roads Western Australia and are detailed in Table 5 below. ASSESSMENT 6

10 Table 5: Existing and future road traffic volumes Existing traffic volumes 24 hour volume North Bound 45,000 South Bound 47,000 Future projected traffic volumes (2031) North Bound South Bound 24 hour volume 63,000-66,000 (66,000 used in model as worst case scenario) 64,000-70,000 (70,000 used in model as worst case scenario) Number of train movements were taken from the train timetable and detailed in Table 6. There are no forecast volumes available for the passenger trains and as a default value, an increase of 2 db has been used in the model (as proposed in the guideline). Table 6: Existing and future rail traffic volumes Existing traffic volumes Day (6am 10pm) Night (10pm 6am) North Bound South Bound 72 9 Traffic composition Traffic composition for existing and future road traffic volumes have been obtained from Main Roads Western Australia and for existing road traffic volumes, the % of heavy vehicles is 9.4% (north bound) and 9.2% (south bound). For future road traffic volumes, the provided % of heavy vehicles is 10% for both north and south bound. The electric rail trains consist of the Type B series which are 3 or 6 carriages long. The number of carriages is understood to change based on specific requirements and an average has been used in the model). Traffic conditions The posted existing and future speed of the road is set to 100 km/h. The speed of the electric trains is ranging from 110 km/h to 130 km/h. Road or rail conditions The road surface will make a significant difference to noise emission (although the effect of this can vary over time). The road surface for the assessed area consists of Open Grade Asphalt and a correction of -2.5 db has therefore been applied to the model as outlined in the guideline. For rail traffic, the calculations are based on the prediction algorithm and in-built corrections. Source heights Road traffic source heights have been adjusted as outlined in the guideline, refer to Table 7 for further details. ASSESSMENT 7

11 Table 7: Noise source heights Vehicle Passenger vehicles (Austroads Class 1 and 2) Heavy vehicles (Austroads Class 3 and up) engine Heavy vehicles (Austroads Class 3 and up) exhaust Passenger rail Height +0.5 m +1.5 m +3.6 m +0.8 m Further to the above, for the CoRTN algorithms, a noise level correction of -0.8 db and -8 db has been applied to heavy vehicle engines and exhaust systems respectively (relative to the source sound power level of passenger vehicles). Receiver height The policy requires that for new noise-sensitive developments, noise levels are to be calculated at the most exposed habitable façade, at heights of 1.4 m above all proposed floor levels. Receiver height of noise predictions for the ground floor is made at 1.4 m above floor level. The maximum number of levels expected for the assessed development is two and predictions for double storey residences has therefore been made at a height of 4.4 m for the upper level. General Topographical data for the development have been provided by Wood & Grieve Engineers and used as basis for the model. Ground type has been assumed to be 0.25 within the road reserve and 0.75 through the development. Buildings have been included (location and size assumed) as they provide a barrier affect if located between a receiver and the source. A height of 3.5 m has been used for single storey building and 7 m for double storey buildings. ASSESSMENT 8

12 4. Noise Modelling Result and Discussion Noise modelling for both road traffic and railway traffic (L Aeq(Day ) has been undertaken for a number of different scenarios including: No mitigations measures - receiver heights at 1.4 m and 4.4 m above ground level. 3 m high barrier - receiver heights at 1.4 m and 4.4 m above ground level. We understand that the position of the barrier is limited to a specific location and it should be noted that this location is not ideal from an acoustic point of view. The ground level at this location is lower than the road and railway level and hence, an inferior shielding effect (less noise reduction) is obtained compared to if the barrier was placed on a location with a higher ground level. It was found that the railway noise level is significantly lower than the road traffic noise level and hence, mitigation measures required to mitigate road traffic noise will also mitigate noise from the railway to an acceptable level. The result shows that without a barrier, the road traffic noise level at 1 m from the facade is expected to exceed the limit criteria at lots facing the Kwinana Freeway. It is also expected that the noise level would exceed the target criteria for a number of houses, refer to Figure 3 (receiver height location at 1.4 m) and Figure 6 (receiver height location at 4.4m) for further details. Figure 4 shows the railway noise level without mitigation measures. Based on the above, a number of mitigation measures will be required to comply with the outdoor noise criteria. A combination of a barrier and different deemed to comply packages (including an expected improved performance package for 4.4 m receiver heights) are recommended. See Appendix C and D for further details of the deemed to comply package and Appendix E for expected details of the improved performance package. In addition to the 3 m barrier, houses falling between db(a) will have to implement Package A deemed-tocomply construction standards as shown in the policy, see Figure 5 and Appendix C for further details. In addition to the 3 m barrier, houses falling between db(a) will have to implement Package B deemed-tocomply construction standards as shown in the policy, see Figure 5 and Appendix D for further details. In addition to the 3 m barrier, houses with noise levels above 63 db(a), but not more than 65 db(a), would have to implement expected increased performance package, see Figure 7 and Appendix E for further details. This package is based on the deemed to comply package B, tailored to further increase the noise insulation performance by 2-3 db. This is only applicable for multi storey dwellings and it is recommended that multi storey dwellings are discouraged in the first row of houses facing the Kwinana Freeway. Notification should be provided to prospective purchasers and be required as a condition of subdivision (including strata subdivision) for the purposes of noise-sensitive development as well as planning approval involving noise-sensitive development, where noise levels are forecast or estimated to exceed the target outdoor noise criteria, regardless of proposed noise attenuation measures. The requirement for notification as a condition of subdivision and the land area over which the notification requirement applies, should be identified in the noise management plan in accordance with the guidelines. An example of a suitable notice is given below. Notice: This lot is situated in the vicinity of a transport corridor and is currently affected, or may in the future be affected, by transport noise. Further information is available on request from the relevant local government offices. NOISE MODELLING RESULT AND DISCUSSION 9

13 Figure 3: Future road traffic noise levels, receiver height 1.4 m no mitigation measures NOISE MODELLING RESULT AND DISCUSSION 10

14 Figure 4: Future railway noise levels, receiver height 1.4 m no mitigation measures NOISE MODELLING RESULT AND DISCUSSION 11

15 Figure 5: Future road traffic noise levels, receiver height 1.4 m with deemed to comply packages and 3 m barrier NOISE MODELLING RESULT AND DISCUSSION 12

16 Figure 6: Future road traffic noise levels, receiver height 4.4 m (double storey building) no mitigation measures NOISE MODELLING RESULT AND DISCUSSION 13

17 Figure 7: Future road traffic noise levels, receiver height 4.4 m (double storey building) with deemed to comply packages, improved performance package and 3 m barrier NOISE MODELLING RESULT AND DISCUSSION 14

18 5. Conclusion A Traffic Noise Assessment Report has been prepared at the request of Terranovis for the development of Lot 12 Honeywood Avenue, Wandi. The development is located adjacent to the Kwinana Freeway (and railway) and a traffic noise assessment has therefore been undertaken to determine the future expected noise levels as well as potential mitigation measures required. Based on the assessment result, a number of mitigation measures will be required to comply with the outdoor noise criteria. A combination of a 3 m barrier and different deemed to comply packages (including an expected improved performance package for 4.4 m receiver heights) can be used. Notification should be provided to prospective purchasers and be required as a condition of subdivision (including strata subdivision) for the purposes of noise-sensitive development as well as planning approval involving noise-sensitive development, where noise levels are forecast or estimated to exceed the target outdoor noise criteria, regardless of proposed noise attenuation measures. The requirement for notification as a condition of subdivision and the land area over which the notification requirement applies, should be identified in the noise management plan in accordance with the guidelines. An example of a suitable notice is given below. Notice: This lot is situated in the vicinity of a transport corridor and is currently affected, or may in the future be affected, by transport noise. Further information is available on request from the relevant local government offices. CONCLUSION 15

19 Appendix A Glossary of Acoustic Terminology A-weighted: db(a): L Aeq : L Aeq(Day) : L Aeq(Night) : L 1, L 10 L 90, etc. Noise Noise-sensitive development: Noise-sensitive development: Outdoor living area Proposed noise-sensitive land use An A-weighted sound level includes the A frequency weighting in the measurement of a sound, to approximate the frequency response of the normal human ear. The level of a sound, measured in decibels, A-weighted (i.e. the level corresponding to the A-scale on a standard sound level meter). The equivalent steady-state, A-weighted sound level (equal energy) which in a specified time period contains the same acoustic energy as the time-varying level during the same period. The L Aeq(16 hour) for the time period 6 am to 10 pm. The L Aeq(8 hour) for the time period 10 pm to 6 am. A statistical measurement giving the sound pressure level which is exceeded for the given percentile of an observation period, i.e. L 90 is the level which is exceeded for 90 percent of an observation period. Sound, especially when it is unwanted, unpleasant or loud. In this policy noise does not include ground vibration. Any proposed development for a noise-sensitive land use that would normally require planning approval. This includes proposals at the following stages of the approval process: structure planning, rezoning, subdivision (including strata subdivision) and development applications. Includes land used for noise-sensitive premises (as defined in the Environmental Protection (Noise) Regulations 1997) occupied solely or mainly for residential or accommodation purposes, rural premises and premises used for the purpose of a caravan park or camping ground; a hospital; a sanatorium, home or institution for the care of persons, a rehabilitation centre, home or institution for persons requiring medical or rehabilitative treatments; education (school, college, university, technical institute, academy or other educational centre, lecture hall or other premises used for the purpose of instruction); public worship; a tavern, hotel, club premises, reception lodge or other premises that provide accommodation for the public; aged care; child care; and prison or detention centre; Is defined in the Residential Design Codes of Western Australia as the area external to a single house or grouped dwelling to be used in conjunction with that dwelling such that it is capable of active or passive use but excludes any area with a dimension of less than 1 m minimum dimension or which, by reason of its development or topography, is not readily accessible from the dwelling. Any noise-sensitive land use that is subject to an approved detailed area plan, subdivision approval or development approval, such that a transport infrastructure provider is able to adequately design noise mitigation measures to protect that development. APPENDIX A GLOSSARY OF ACOUSTIC TERMINOLOGY 16

20 Appendix B Measurement Result APPENDIX B MEASUREMENT RESULT 17

21 Appendix C Package A: Noise Levels within the Margin The following noise insulation package is designed to meet the indoor noise standards for residential developments in areas adjacent to major roads or passenger railways where noise levels exceed the noise target but are within the limit. Area type Orientation Package A measures Indoors Bedrooms Facing road/rail corridor 6 mm laminated glazing Casement or awning windows No external doors No vents to outside walls/eaves Mechanical ventilation/airconditioning (see below) Side-on to corridor 6 mm laminated glazing Mechanical ventilation/airconditioning Away from corridor No requirements Living and work areas 3 Facing corridor 6 mm laminated glazing Casement or awning windows 35 mm (minimum) solid core external doors with acoustic seals 4 Sliding doors must be fitted with acoustic seals No vents to outside walls/eaves Mechanical ventilation/airconditioning Side-on to corridor 6 mm glazing Mechanical ventilation/airconditioning Away from corridor No requirements Other indoor areas Any No requirements Outdoors Outdoor living area 5 Facing corridor Side-on to corridor Minimum 2.0 m high solid fence (e.g. Hardifence, pinelap, or Colorbond) Picket fences are not acceptable Away from corridor No requirements Where outdoor noise levels are above the target, package A requires mechanical ventilation or airconditioning to ensure that windows can remain closed in order to achieve the indoor noise standards. In implementing package A, the following need to be observed: Evaporative airconditioning systems will meet the requirements for package B provided attenuated air vents are provided in the ceiling space. Without such vents, these systems require windows to remain open. Refrigerative airconditioning systems need to be designed to achieve fresh air ventilation requirements. Air inlets need to be positioned facing away from the corridor where practicable. Ductwork needs to be provided with adequate silencing, particularly in higher noise areas, to prevent noise intrusion. 3 These deemed-to-comply guidelines adopt the definitions of indoor spaces used in AS A comparable description for bedrooms, living and work areas is that defined by the Building Guide of Australia as a habitable room. The Building Guide of Australia may be referenced if greater clarity is needed. A living or work area can be taken to mean any habitable room other than a bedroom. Note that there are no noise insulation requirements for utility areas such as bathrooms. The Building Guide of Australia describes these utility spaces as non-habitable rooms. 4 Glazing panels are acceptable in external doors facing the transport corridor. However these must meet the minimum glazing requirements. 5 The policy requires that at least one outdoor living area be reasonably protected from transport noise. The protected area should meet the minimum space requirements for outdoor living areas, as defined in the Residential Design Codes of Western Australia. APPENDIX C PACKAGE A: NOISE LEVELS WITHIN THE MARGIN 18

22 Appendix D Package B: Noise within 3dB above the limit The following noise insulation package is designed to meet the indoor noise standards for residential developments in areas adjacent to major roads or passenger railways where transport noise levels exceed the noise "limit" but by no more than 3dB. Area type Orientation Package B measures Indoors Bedrooms Facing road/rail corridor 10 mm laminated glazing Casement or awning windows No external doors No vents to outside walls/eaves Mechanical ventilation/airconditioning (see below) Side-on to corridor 6 mm laminated glazing Casement or awning windows Mechanical ventilation/airconditioning Away from corridor No requirements Living and work areas 6 Facing corridor 10 mm laminated glazing Casement or awning windows 40 mm (minimum) solid core external doors with acoustic seals 7 Sliding doors must be fitted with acoustic seals No vents to outside walls/eaves Mechanical ventilation/airconditioning Side-on to corridor 6 mm laminated glazing Casement or awning windows Mechanical ventilation/airconditioning Away from corridor No requirements Other indoor areas Any No requirements Outdoors Outdoor living area 8 Facing corridor Side-on to corridor Minimum 2.4 m solid fence (e.g. brick, limestone or Hardifence) Colorbond and picket fences are not acceptable Away from corridor No requirements Where outdoor noise levels are within 3dB above the limit, package B requires mechanical ventilation or airconditioning to ensure that windows can remain closed in order to achieve the indoor noise standards. In implementing package B, the following need to be observed: Evaporative airconditioning systems will meet the requirements for package B provided attenuated air vents are provided in the ceiling space. Without such vents, these systems require windows to remain open. Refrigerative airconditioning systems need to be designed to achieve fresh air ventilation requirements. Air inlets need to be positioned facing away from the corridor where practicable. Ductwork needs to be provided with adequate silencing, particularly in higher noise areas, to prevent noise intrusion. 6 These deemed-to-comply guidelines adopt the definitions of indoor spaces used in AS A comparable description for bedrooms, living and work areas is that defined by the Building Guide of Australia as a habitable room. The Building Guide of Australia may be referenced if greater clarity is needed. A living or work area can be taken to mean any habitable room other than a bedroom. Note that there are no noise insulation requirements for utility areas such as bathrooms. The Building Guide of Australia describes these utility spaces as non-habitable rooms. 7 Glazing panels are acceptable in external doors facing the transport corridor. However these must meet the minimum glazing requirements. 8 The policy requires that at least one outdoor living area be reasonably protected from transport noise. The protected area should meet the minimum space requirements for outdoor living areas, as defined in the Residential Design Codes of Western Australia. APPENDIX D PACKAGE B: NOISE WITHIN 3DB ABOVE THE LIMIT 19

23 Appendix E Improved Performance Package : Noise between 3dB and 5dB above the limit The following noise insulation package is designed to meet the indoor noise standards for residential developments in areas adjacent to major roads or passenger railways where transport noise levels exceed the noise "limit" by no more than 5dB. Area type Orientation Package B measures Indoors Bedrooms Facing road/rail corridor 10.5 mm Viridian VLam Hush Glass Casement or awning windows with acoustic seals No external doors No vents to outside walls/eaves Mechanical ventilation/airconditioning (see below) Side-on to corridor 10.5 mm Viridian VLam Hush Glass Casement or awning windows with acoustic seals Mechanical ventilation/airconditioning Away from corridor No requirements Living and work areas 9 Facing corridor 10.5 mm Viridian VLam Hush Glass Casement or awning windows 40 mm (minimum) solid core external doors with acoustic seals 10 No sliding doors are allowed No vents to outside walls/eaves Mechanical ventilation/airconditioning Side-on to corridor 10 mm laminated glazing Casement or awning windows Mechanical ventilation/airconditioning Away from corridor No requirements Other indoor areas Any No requirements Outdoors Outdoor living area 11 Facing corridor Side-on to corridor Minimum 3 m solid fence (e.g. brick, limestone or Hardifence) Colorbond and picket fences are not acceptable Away from corridor No requirements Where outdoor noise levels are within 5dB above the limit, this package requires mechanical ventilation or airconditioning to ensure that windows can remain closed in order to achieve the indoor noise standards. In implementing this package the following need to be observed: Evaporative airconditioning systems will meet the requirements for package provided attenuated air vents are provided in the ceiling space. Without such vents, these systems require windows to remain open. Refrigerative airconditioning systems need to be designed to achieve fresh air ventilation requirements. Air inlets need to be positioned facing away from the corridor where practicable. Ductwork needs to be provided with adequate silencing, particularly in higher noise areas, to prevent noise intrusion. 9 These deemed-to-comply guidelines adopt the definitions of indoor spaces used in AS A comparable description for bedrooms, living and work areas is that defined by the Building Guide of Australia as a habitable room. The Building Guide of Australia may be referenced if greater clarity is needed. A living or work area can be taken to mean any habitable room other than a bedroom. Note that there are no noise insulation requirements for utility areas such as bathrooms. The Building Guide of Australia describes these utility spaces as non-habitable rooms. 10 Glazing panels are acceptable in external doors facing the transport corridor. However these must meet the minimum glazing requirements. 11 The policy requires that at least one outdoor living area be reasonably protected from transport noise. The protected area should meet the minimum space requirements for outdoor living areas, as defined in the Residential Design Codes of Western Australia. APPENDIX E IMPROVED PERFORMANCE PACKAGE : NOISE BETWEEN 3DB AND 5DB ABOVE THE LIMIT 20