822 Pittwater Road, Dee Why Environmental Noise Impact Assessment
MANAGING DIRECTORS MATTHEW PALAVIDIS VICTOR FATTORETTO DIRECTORS MATTHEW SHIELDS BEN WHITE 822 Pittwater Road, Dee Why Environmental Noise Impact Assessment SYDNEY A: 9 Sarah St Mascot NSW 2020 T: (02) 8339 8000 F: (02) 8338 8399 SYDNEY MELBOURNE BRISBANE CANBERRA LONDON DUBAI SINGAPORE GREECE www.acousticlogic.com.au ABN: 11 068 954 343 The information in this document is the property of Acoustic Logic Consultancy Pty Ltd ABN 11 068 954 343 and shall be returned on demand. It is issued on the condition that, except with our written permission, it must not be reproduced, copied or communicated to any other party nor be used for any purpose other than that stated in particular enquiry, order or contract with which it is issued. I:\Jobs\2012\20120550\20120550.1\20120628GCa_R1_Environmental Noise Impact Assessment.doc 1 DOCUMENT CONTROL REGISTER Project Number Project Name Document Title Document Reference Issue Type Attention To 20120550.1 822 Pittwater Road, Dee Why Environmental Noise Impact Assessment 20120550.1/2806A/R1/GC Email Dep Dee Why Pty Ltd Mr Nathan Grice Revision Date Document Reference 0 1 28/06/2012 28/06/2012 20120550.1/2806A/R0/GC 20120550.1/2806A/R1/GC I:\Jobs\2012\20120550\20120550.1\20120628GCa_R1_Environmental Noise Impact Assessment.doc Prepared By GC GC Checked By Approved By BW BW 2 TABLE OF CONTENTS 1 2 3 4 INTRODUCTION SITE DESCRIPTION NOISE DESCRIPTORS ASSESSMENT OF TRAFFIC NOISE INTRUSION 4.1 RESIDENTIAL TRAFFIC NOISE CRITERIA 4.1.1 Warringah Council DCP 4.1.2 State Environmental Planning Policy 2007 4.2 NON-RESIDENTIAL TRAFFIC NOISE CRITERIA 4.3 NOISE MONITORING 4.3.1 Unattended Noise Monitoring 4.3.2 Attended Monitoring 4.3.3 Resultant Noise Levels 4.4 RECOMMENDED CONSTRUCTIONS 4.4.1 Glazed Windows and Doors 4.4.2 Roof/Ceiling 4.4.3 External Walls 4.4.4 Entry Doors 4.4.5 Ventilation requirements 5 EXTERNAL NOISE EMISSION ASSESSMENT 5.1 ACOUSTIC OBJECTIVES 5.1.1 Warringah Council DCP 5.1.2 INDUSTRIAL NOISE POLICY OBJECTIVES/GUIDELINES 5.1.2.1 Intrusiveness Criterion 5.1.2.2 Amenity Criterion 5.1.2.3 Sleep arousal 5.1.3 Protection of the Environment Operations Act Regulation 5.2 RECOMMENDATIONS 6 CONCLUSION I:\Jobs\2012\20120550\20120550.1\20120628GCa_R1_Environmental Noise Impact Assessment.doc 4 5 7 8 8 8 8 9 9 9 9 9 10 10 12 12 12 12 13 13 13 13 14 14 15 15 15 16 3 1 INTRODUCTION This report presents an analysis of acoustic impacts associated with the proposed mixed development at 822 Pittwater Road, Dee Why. In this report we will: In this report we will: • Conduct an external noise impact assessment and recommend acoustic treatments to ensure that internal noise levels comply with the requirements of SEPP 2007, AS 2107 “Recommended Design Sound Levels and Reverberation Times for Building Interiors” and Warringah Council DCP. • Identify potential noise sources generated by the site, and determine noise emission goals for the development to meet acoustic requirements by the NSW EPA Industrial Noise Policy This report has been prepared based on architectural drawings presented in the table below: Table 1 – Referenced Drawings Consultant Stephen Bowers Architects Drawing Title Date Ground Floor 16 Jan 2012 Upper Ground 16 Jan 2012 Level 1 16 Jan 2012 Level 2 16 Jan 2012 Level 3 16 Jan 2012 Level 4 16 Jan 2012 Level 5 16 Jan 2012 I:\Jobs\2012\20120550\20120550.1\20120628GCa_R1_Environmental Noise Impact Assessment.doc 4 2 SITE DESCRIPTION The proposed development consists of a 5 storey and 3 storey mixed development buildings located on Pittwater Road and Delmar Parade, Dee Why. The western façade faces Pittwater Road which is a six lane road, which carries medium to high traffic flow. The southern façade faces Delmar Parade, which is a two lane road with low traffic flow primarily used for residential/commercial access. The northern façade is bound by existing commercial and residential buildings while the eastern façade is bound by existing residential buildings. The following noise sources are potentially impact on the project site: • Traffic Noise along Pittwater Road. Noise potentially generated by the site will consist primarily of noise from the mechanical plant. The nearest potentially affected noise receivers are: • Residences and commercial bounding the site to the north; • Residences bounding the site to the east; • Residences and commercial properties on the southern side of Delmar Parade. • Commercial properties on the western side of Pittwater Road. Refer to Figure 1 below, which is an aerial photo of the existing development. I:\Jobs\2012\20120550\20120550.1\20120628GCa_R1_Environmental Noise Impact Assessment.doc 5 Figure 1 – Site Map Site Boundary Attended Noise Monitoring I:\Jobs\2012\20120550\20120550.1\20120628GCa_R1_Environmental Noise Impact Assessment.doc N 6 3 NOISE DESCRIPTORS Traffic noise constantly varies in level, due to fluctuations in traffic speed, vehicle types, road conditions and traffic densities. Accordingly, it is not possible to accurately determine prevailing traffic noise conditions by measuring a single, instantaneous noise level. To accurately determine the effects of traffic noise a 15-20 minute measurement interval is utilised. Over this period, noise levels are monitored on a continuous basis and statistical and integrating techniques are used to determine noise description parameters. These parameters are used to measure how much annoyance would be caused by a particular noise source. In the case of environmental noise three principle measurement parameters are used, namely L10, L90 and Leq. The L10 and L90 measurement parameters are statistical levels that represent the average maximum and average minimum noise levels respectively, over the measurement interval. The L10 parameter is commonly used to measure noise produced by a particular intrusive noise source since it represents the average of the loudest noise levels produced by the source. Conversely, the L90 level (which is commonly referred to as the background noise level) represents the noise level heard in the quieter periods during a measurement interval. The L90 parameter is used to set the allowable noise level for new, potentially intrusive noise sources since the disturbance caused by the new source will depend on how audible it is above the pre-existing noise environment, particularly during quiet periods, as represented by the L90 level. The Leq parameter represents the average noise energy during a measurement period. This parameter is derived by integrating the noise levels measured over the measurement period. Leq is important in the assessment of traffic noise impact as it closely corresponds with human perception of a changing noise environment; such is the character of traffic noise. Current practice favours the Leq parameter as a means of measuring traffic noise, whereas the L10 parameter has been used in the past and is still incorporated in some codes. For the reasons outlined above, the L90 parameter is not used to assess traffic noise intrusion. I:\Jobs\2012\20120550\20120550.1\20120628GCa_R1_Environmental Noise Impact Assessment.doc 7 4 ASSESSMENT OF TRAFFIC NOISE INTRUSION Significant traffic noise sources in the vicinity of the site are as follows: • Pittwater Road, on the western property boundary, which carries medium to high traffic flows. Traffic noise impacts should comply with the requirements of Warringah Council DCP, SEPP 2007 and the Australian Standard AS2107:2000. 4.1 4.1.1 RESIDENTIAL TRAFFIC NOISE CRITERIA Warringah Council DCP Part D Section D3 of the Warringah Development Control Plan states the following with regards to the control of traffic noise intrusion: “2. Development near existing noise generating activities, such as industry and roads, is to be designed to mitigate the effect of that noise.” No relevant criteria information or design controls were found in the Warringah Council DCP in regards to noise impact assessment of developments so therefore noise impact criteria and design controls from the State Environmental Planning Policy 2007 will be used in its place. 4.1.2 State Environmental Planning Policy 2007 The State Environmental Planning Policy (Infrastructure) 2007 (the ‘Infrastructure SEPP’) sets out internal noise levels for developments with the potential to be impacted by traffic or rail noise and vibration. The Infrastructure SEPP defines busy roads that are subject to an acoustic assessment as: “Roads specified in Clause 102 of the Infrastructure SEPP: a freeway, tollway or a transitway or any other road with an average annual traffic (AADT) volume of more than 40,000 vehicles (based on the traffic volume data provided on the website of the RTA). Any other road – with an average annual daily traffic (AADT) volume of more than 20,000 vehicles (based on the traffic volume data published on the website of the RTA). Any other road – with a high level of truck movements or bus traffic.” The Infrastructure SEPP sets out the following criteria for internal noise levels from airborne traffic noise: “For Clauses 87 (Rail) and 102 (Road): “If the development is for the purpose of a building for residential use, the consent authority must be satisfied that appropriate measures will be taken to ensure that the following LAeq levels are not exceeded: in any bedroom in the building : 35dB(A) at any time 10pm–7am anywhere else in the building (other than a garage, kitchen, bathroom or hallway): 40dB(A) at any time.” Internal requirements are for residential units and are measured internally with windows closed. I:\Jobs\2012\20120550\20120550.1\20120628GCa_R1_Environmental Noise Impact Assessment.doc 8 4.2 NON-RESIDENTIAL TRAFFIC NOISE CRITERIA Non-residential uses will be assessed with reference to AS NZS 2107-2000 “Recommended Design Sound Levels and Reverberation Times for Building Interiors” for commercial recommended levels, as presented below. Table 2 - Traffic Noise Level Objectives for Commercial and Retail Space SPACE/ACTIVITY TYPE OBJECTIVES Internal Noise Level dB(A) Leq Retail Shops 45-50 General Office Areas 40-45 Apartment Common Areas (Main Entry) 45-50 4.3 NOISE MONITORING As part of this investigation, traffic noise from the surrounding perimeter roadways has been measured. The results of this measurement will be used to determine the treatments required to reduce noise levels to within the project acoustic objectives. Measurements included attended and unattended noise levels measurements conducted at the locations as detailed in Figure 1 above. 4.3.1 Unattended Noise Monitoring Unattended noise monitoring was conducted at a site representative of the proposed development using an Acoustic Research Laboratories Pty Ltd series 315 noise monitor. The monitor was programmed to store 15-minute statistical noise levels throughout the unmanned monitoring period. Equipment was calibrated at the beginning and the end of the measurement using a Rion NC-74 calibrator; no significant drift was detected. All measurements were taken on A-weighted fast response mode. The unattended noise monitor was installed from 4th April to 10th April 2008. 4.3.2 Attended Monitoring Attended monitoring was conducted on Pittwater Road in line with the future proposed façade of the development. Attended measurements were obtained using a Norsonics type 118 Precision Sound Analyser. The analyser was set to fast response and calibrated before and after the measurements using a Norsonics Sound Calibrator type 1251. No significant drift was noted. Measurements were conducted on 21st June 2012 during the evening traffic peak time. 4.3.3 Resultant Noise Levels The following table presents the resultant noise levels at the proposed façade of the development. The noise levels are based on both the attended and previous unattended noise measurement results conducted by this office. The noise levels are based on the manned background noise measurement results adjusted by the difference with the noise monitor results of similar time periods and distance attenuation. I:\Jobs\2012\20120550\20120550.1\20120628GCa_R1_Environmental Noise Impact Assessment.doc 9 Table 3 - Measured Traffic Noise Levels Traffic Noise Level Locations Pittwater Road (Western Boundary) 4.4 Daytime (7am-10pm) Night-time (10pm- 7am) 75 dB(A) Leq(15 Hour) 71 dB(A) Leq(9 Hour) RECOMMENDED CONSTRUCTIONS Traffic noise intrusion into the proposed development was assessed using the measured external noise levels reported above as a basis. Calculations were performed taking into account the orientation of windows, the total area of glazing, facade transmission loss and room sound absorption characteristics. In this way the likely interior noise levels can be predicted. Acoustic treatment required to ensure compliance with the assessment criteria are detailed in this section. Internal noise levels will primarily be as a result of noise transfer through the windows and doors as these are relatively light building elements that offer less resistance to the transmission of sound. Noise transfer through the masonry elements will not be significant and need not be considered further. The constructions necessary to achieve the noise levels are detailed below. The predicted noise levels have been based on the expected level and spectral characteristics of the external noise, the area of building elements exposed to traffic noise, the absorption characteristics of the rooms and the noise reduction performance of the building elements. 4.4.1 Glazed Windows and Doors The following constructions are recommended to comply with the traffic noise objectives stated in Section 4.2. Aluminium framed/sliding glass doors and windows will be satisfactory provided they meet the following criteria. Thicker glazing may be required for structural, safety or other purposes. Where it is required to use thicker glazing than scheduled, this will also be acoustically acceptable. The recommended constructions are listed in Table 4 below. I:\Jobs\2012\20120550\20120550.1\20120628GCa_R1_Environmental Noise Impact Assessment.doc 10 Table 4 - Glazing Construction Building Façade Room Glazing Acoustic Seals Retail 6.38mm Laminated Yes Offices 6.38mm Laminated Yes Lobby 6.38mm Laminated Yes Living Areas 10.38mm Laminated/100mm airgap/4mm toughened Yes Study 10.38mm Laminated/100mm airgap/4mm toughened Yes Bedrooms 12.38mm Laminated Yes Living Areas 10.38mm Laminated Yes Bedrooms 12.38mm Laminated Yes Living Areas 10.38mm Laminated Yes All Bedrooms 6.38mm Laminated Yes All Living Rooms 6.38mm Laminated Yes Offices/Commercial 6mm Toughened Yes Lobby 6mm Toughened Yes Bedrooms 6.38mm Laminated Yes Living Areas 6.38mm Laminated Yes Level Ground Western Upper Ground to 5 A Northern Southern Eastern All All Ground B All All Note: Final glazing thickness will be determined at the CC stage following on site unattended noise monitoring and final design of elevations. The proposed glazing thickness will satisfy all acoustic requirements of Section 4.2 and Section 5.3. Thicker glazing may be required for structural, safety or other purposes. Where it is required to use thicker glazing than scheduled, this will also be acoustically acceptable. It is recommended that only window systems having test results indicating compliance with the required ratings obtained in a certified laboratory be used where windows with acoustic seals have been recommended. In addition to complying with the minimum scheduled glazing thickness, the STC rating of the glazing fitted into open-able frames and fixed into the building opening should not be lower than the values listed in Table 5 for all rooms. Where nominated, this will require the use of acoustic seals around the full perimeter of open-able frames and the frame will need to be sealed into the building opening using a flexible sealant. I:\Jobs\2012\20120550\20120550.1\20120628GCa_R1_Environmental Noise Impact Assessment.doc 11 Table 5 - Minimum STC of Glazing (with Acoustic Seals) Glazing Assembly Minimum STC of Installed Window 6mm Toughened 29 6.38mm Laminated 31 10.38mm laminated 35 12.38mm laminated 37 10.38mm Laminated/100 airgap/4mm Toughened 45 4.4.2 Roof/Ceiling Any roof of concrete construction will not require upgrading in order to satisfy the project acoustic objectives. 4.4.3 External Walls External walls are of masonry construction and do not require upgrading in order to satisfy the project acoustic objectives. 4.4.4 Entry Doors Entry doors shall be minimum 40mm solid core timber with Raven RP10 seals along the sides and top and a Raven RP38 along the bottom. The Main Entry door to the site to be constructed by a minimum of 6.38mm laminated glass. 4.4.5 Ventilation requirements As the recommended internal noise levels cannot be achieved with windows open within the development, an alternative outside air supply system or air conditioning will be required to be installed. All proposed tenancies are required to be provided with an alternative ventilation or air conditioning system to maintain adequate ventilation with the windows closed. Any alternative ventilation system that is installed should be acoustically designed to ensure that the acoustic performance of the recommended constructions is not reduced and does not exceed Council criteria for noise emission to nearby properties. I:\Jobs\2012\20120550\20120550.1\20120628GCa_R1_Environmental Noise Impact Assessment.doc 12 5 EXTERNAL NOISE EMISSION ASSESSMENT Noise emissions from the site should be assessed to ensure that the amenity of nearby land users is not adversely affected. Potential noise sources which should be assessed are: • Noise generated by mechanical plant. The nearest potentially affected noise receivers are: • Residences and commercial bounding the site to the north; • Residences bounding the site to the east; • Residences and commercial properties on the southern side of Delmar Parade. • Commercial properties on the western side of Pittwater Road. • Noise emissions noise will be assessed to the following criteria: • Warringah Council DCP • The NSW EPA Industrial Noise Policy 5.1 ACOUSTIC OBJECTIVES Noise emissions from the site should comply with all of the acoustic criteria outlined below. 5.1.1 Warringah Council DCP Part D Section D3 of the Warringah Development Control Plan states the following with regards to the control of noise emission: “1. Noise from combined operation of all mechanical plant and equipment must not generate noise levels that exceed the ambient background noise by more than 5dB(A) when measured in accordance with the NSW Industrial Noise Policy at the receiving boundary of residential and other noise sensitive land uses.” 5.1.2 INDUSTRIAL NOISE POLICY OBJECTIVES/GUIDELINES The EPA Industrial Noise Policy provides guidelines for the assessment of noise impacts from industrial and commercial premises. The recommended assessment objectives vary depending on the nearest potentially affected residential receivers, the time of day and the type of noise source. The EPA Industrial Noise Policy has two requirements that must both be satisfied; that is, an intrusiveness criterion and an amenity criterion. Criterion for neighbouring commercial/retail/recreation properties are based on set noise level criterion within the Industrial Noise Policy. If a noise source achieves compliance with the INP guidelines it would generally be accepted the noise source would not cause “offensive noise” as defined in the Protection of the Environment Operations Act (refer below). I:\Jobs\2012\20120550\20120550.1\20120628GCa_R1_Environmental Noise Impact Assessment.doc 13 5.1.2.1 Intrusiveness Criterion The guideline is intended to limit the audibility of noise emissions, and requires that noise emissions measured using the Leq descriptor not exceed the existing background noise level by more than 5 dB(A) Where applicable, the intrusive noise level should be penalised (increased) to account for any annoying characteristics such as tonality. 5.1.2.2 Amenity Criterion The guideline is intended to limit the absolute noise level from all noise sources to a level that is consistent with the general environment. The EPA Industrial Noise Policy sets out acceptable noise levels for various localities. Table 2.1 titled “Amenity Criteria” on page 16 of the Policy designates four categories to distinguish different residential areas. They are rural, suburban, urban and urban/industrial interface. The EPA Industrial Noise Policy also includes recommended noise levels for other land uses such as commercial and industrial premises. The nearest potentially affected residential premises situated immediately to the south of the proposed development site which have been classified as being situated in an sub-urban noise amenity area as defined by the EPA NSW Industrial Noise Policy. The following table presents the amenity criteria applicable to the nominated nearest potentially affected receivers. The receiver type utilised against the indicative noise amenity area is defined by the sub-urban criteria. For the purposes of this condition: • Day is defined as the period from 7am to 6pm Monday to Saturday and 8am to 6pm Sundays and Public Holidays; • Evening is defined as the period from 6pm to 10pm. • Night is defined as the period from 10pm to 7am Monday to Saturday and 10pm to 8am Sunday and public holidays. Table 9 – OEH Amenity Noise Levels Type of Receiver Residential - Urban Time of day Recommended Noise Level dB(A)Leq(period) Day 60 Evening 50 Night 45 I:\Jobs\2012\20120550\20120550.1\20120628GCa_R1_Environmental Noise Impact Assessment.doc 14 5.1.2.3 Sleep arousal To minimise the potential for sleep arousal the L1 (1 minute) noise level of any specific noise source does not exceed the background noise level (L90) by more than 15 dB(A) outside a resident’s bedroom window between the hours of 10pm and 7am. The L1 noise level is the level exceeded for 1 per cent of the time and approximates the typical maximum noise level from a particular source. Where the typical repeatable existing L1 levels exceed the above requirement then the existing L1 levels form the basis for, sleep disturbance criteria. 5.1.3 Protection of the Environment Operations Act Regulation Protection of the Environmental Operations regulation limits the noise levels associated within the operation of domestic air conditioning criteria during night time periods which is presented below: Protection of the Environmental Operations (Noise Control) Regulation 2000-Sect 52 52 Air Conditioners (1) A person must not cause or permit an air conditioner to be used on residential premises in such a manner that it emits noise that can be herd within a habitable room in any other residential premises (regardless of weather any door or window to that room is open): (a) before 8 am or after 10 pm on any Saturday, Sunday or public holiday, or (b) before 7 am or after 10 pm on any other day. 5.2 RECOMMENDATIONS Mechanical plant items are not typically selected at DA stage. Detailed review of all external mechanical plant should be undertaken at construction certificate stage (once plant selections and locations are finalised). Acoustic treatments should be determined in order to control plant noise emissions to the levels set out in table 6.3 of this report. Based on previous experiences with similar developments, all plant can be satisfactorily attenuated to levels complying with the noise emission criteria through appropriate locations (where possible) and acoustic treatments such as lining of ductwork, acoustic silences, variable speed controllers, time switches, acoustic screens etc. I:\Jobs\2012\20120550\20120550.1\20120628GCa_R1_Environmental Noise Impact Assessment.doc 15 6 CONCLUSION This report presents the results from the acoustic assessment of noise impacts associated with the proposed mixed use development to be located at 822 Pittwater Road, Dee Why. Noise intrusion from traffic associated with surrounding roadways will comply with the Warringah Council, SEPP 2007 and AS2107 noise criteria on the proviso that the acoustic treatments detailed in Section 4 are adopted. External noise emission criteria have been setup in Section 5 of this report based on the requirements of the NSW EPA Industrial Noise Policy. Detailed plant noise emission shall be designed to comply with this criterion during CC stage. We trust this information is satisfactory. Please contact us should you have any further queries. Yours faithfully, Acoustic Logic Consultancy Pty Ltd Glen Campbell I:\Jobs\2012\20120550\20120550.1\20120628GCa_R1_Environmental Noise Impact Assessment.doc 16
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