R e p o r t th A u g u s t

Transcription

1 N o ise Mon it o r ing R e p o r t L e g a c y W a y T u n n e l M o n i t o r i n g P o s t C o m m is s i o n ing T es ts V e n ti la t ion S t a c ks Jun e R e p o r t th A u g u s t Nois e M eas u r em en t S e r v i c e s P ty L td 1 8 L a d e S t re et, G a y th o r n e Q L D P O B o x , Br o o ks id e C e n t r e Q L D P h : ( 0 7 ) F a x : ( 0 7 ) E m a il: i n f n o i s e m e a s u r e m e n t.co m. a u

2 Document Control NOISE MEASUREMENT SERVICES PTY LTD 18 Lade Street, Gaythorne, QLD 4051 Telephone: (07) PO Box 2127 Facsimile: (07) Brookside Centre, QLD Copy No Revision No Issue Date Revision Description Author Review 0 04/08/2016 Report for discussion MD/BM MT Copy No(s) Rev No Destination 1 pdf 0 EGIS Road Operation Australia 2 0 REPORT FOR EGIS Road Operation Australia CONTACT Luke Jerdan, Greg Freeman Signed Max Thorne Ll.B Director - NMS Matthew Dever B Audio Senior Acoustician - NMS DISCLAIMER This Report by is prepared for a particular Client and is based on the agreed objective, scope, conditions and limitations as may be stated in the Executive summary. The Report presents only the information that Noise Measurement Services Pty Ltd believes, in its professional opinion, is relevant and necessary to describe the issues involved. The Report should not be used for anything other than the intended purpose and should not be reproduced, presented or reviewed except in full. The intellectual property of this Report remains with. The Client is authorised, upon payment to of the agreed Report preparation fee, to provide this Report in full to any third party. 2

3 Contents Referenced Documents... 4 Executive Summary... 5 Conclusions... 5 Recommendations Introduction Noise Criteria Survey Results Measured Noise Levels at ML1 - East Vent Measured Noise Levels at ML2 - Victoria Park Road and Normanby Terrace Measured Noise Levels at ML3 (previously ML10) - Anzac Park above dog park and adjacent to bible collage Measured Noise Levels at ML4 - Ada Park (east side of park boundary) Noise Level Predictions Noise Source Levels Sensitive Receptors Weather Conditions Predicted Noise Levels Appendix A: Glossary

4 Referenced Documents Excerpt from CM-OP-CX-0001-B ( to inclusive)* Excerpt from The Legacy Way Project (formerly known as Northern Link Road Tunnel) Coordinator-General s report on project changes, pages 75 and 76* Excerpt from LWTP-ENV-PLA-004 dated 18/05/2016; sections 5.1 and 6.1* * All of the above have only been provided in excerpt form and Noise Measurement Services has not been provided with the full documents or other context. Agreement to Provide Services (Egis Projects Asia Pacific Pty Ltd) AS1055.1:1997 Acoustics - Description and Measurement of Environmental Noise - Part 1: General Procedures AS2702:1984 Acoustics - Methods for the Measurement of Road Traffic Noise Queensland Department of Environment and Heritage (2013) Noise Measurement Manual 4

5 Executive Summary This Report is prepared for EGIS Road Operation Australia in response to a request for the monitoring of ventilation system noise levels at sensitive locations for the Legacy Way Tunnel. This Report presents results from attended noise measurements that were undertaken on the evening of 18 th of June 2016, with unattended measurements conducted from 18 th to 20 th of June Conclusions The noise from the ventilation system was observed and predicted to be within compliance with required limits in the June 2016 tests. Recommendations Further monitoring be undertaken on a periodical basis as required by the Coordinator Generals Operational and Maintenance requirements, to ensure continued compliance. 5

6 1. Introduction This Report is prepared for EGIS Road Operation Australia in response to a request for the monitoring of ventilation system noise levels at sensitive locations for the Legacy Way Tunnel. This Report presents results from attended noise measurements that were undertaken during the evening of 18 June 2016, with unattended measurements conducted from 18 to 20 June It is understood that this noise investigation is required as part of the Coordinator General s Operations and Maintenance Phase conditions for the operation of the Legacy Way tunnel. A summary of the information provided by Noise Measurement Services is set out in Section 2. This Report presents results from unattended noise measurements that were undertaken at four locations selected as being representative of noise emissions from the ventilation system. This Report presents results from attended noise measurements that were undertaken on the evening of 16 June 2016, with unattended measurements conducted from 16 to 18 June A summary of the measurement locations is presented in Table 1.1, detailed information and measurement results are presented in Section 3. The purpose of this report, in part, is to ensure ventilation system noise levels are in conformance with regulatory requirements, which are based on background noise levels. A comparison between measured 2014 noise levels and measured and predicted 2016 noise levels is presented in Section 4. Table 1.1: Summary of Measurement Locations. ML # Vent Description GPS Co-ordinates (GDA 94) Logger Number 1 East Victoria Park Golf Course Adjacent to vent stack E N East Victoria Park Road and Normanby Terrace E N West Anzac park above dog park, adjacent to bible collage E N West Ada Park (east boundary of park) E N 1255 A glossary of terms used in this Report is presented in Appendix A. 6

7 2. Noise Criteria Criteria for noise attributable to the ventilation system is provided in the Coordinator-General s report on project changes (Table 6) and the Noise and Vibration Management Operation and Maintenance EMP Sub-plan (Tunnel Alignment) (Figure 8), these criteria are reproduced below: 7

8 3. Survey Results The sound level measuring equipment used at each measurement location was field calibrated before and after each measurement session and all units were found to be within appropriate tolerances of the reference signal. All sound level instrumentation used in this assessment holds a current calibration certificate from a certified NATA calibration laboratory. The following instruments were used to measure the ambient noise levels- 4 x Larson Davis LD831 Type 1 Environmental Noise Loggers Quest CA-22 Calibrator, Class 1 Ambient sound pressure levels were measured generally in accordance with Australian Standard AS1055.1:1997 Acoustics - Description and Measurement of Environmental Noise - Part 1: General Procedures, and AS2702:1984 Acoustics - Methods for the Measurement of Road Traffic Noise. Ambient noise levels were recorded at 10 minute intervals from Thursday 16 to Saturday 18 June Specific detail and results for each measurement location are set out in the following sections. 8

9 3.1 Measured Noise Levels at ML1 - East Vent The measurement location ML1 was located approximately 12m west of the Eastern Vent. The location is considered to be in a free-field. Noise levels at this site are dominated by road traffic noise from the Inner City Bypass and rail noise. Observations were made at the site during the quietest period between midnight and 2:00am. No audible noise was observed emanating from the vent. Plate 3.1: Showing the location of noise logger ML1 (Source: Google, Queensland Government) 9

10 Photo 3.1: The noise logger is located along the steel fence seen in the centre of the photograph (Source: NMS) Table 3.1: Average noise levels recorded at Location ML1, Friday 17 June 2016 (levels in db(a), free-field). Time of day L 01 L 10 L 90 L eq Day Evening Night Highest Day time 62.1 Highest Night time 61.8 Highest 1hr 63.6 CRTN (18hr) hr Figure 3.1: Noise levels at location ML1. 10

11 3.2 Measured Noise Levels at ML2 - Victoria Park Road and Normanby Terrace The measurement location ML2 was located at the end of Victoria Park road in Kelvin Grove. The location is approximately 190m southwest of the Eastern Vent. The location is considered to be in a free-field. Noise levels at this site are dominated by road traffic along the Inner City Bypass. Plate 3.2: Showing the location of noise logger ML2 (Source: Google, Queensland Government) Photo 3.2: ML2 can be seen in the centre of the photograph, the vent can be seen in the distance (Source: NMS) 11

12 Table 3.2: Average noise levels recorded at Location ML2, Friday 17 June 2016 (levels in db(a), free-field). Time of day L 01 L 10 L 90 L eq Day Evening Night Highest Day time 66.9 Highest Night time 66.1 Highest 1hr 68.5 CRTN (18hr) hr Figure 3.2: Noise levels at location ML2. 12

13 3.3 Measured Noise Levels at ML3 (previously ML10) - Anzac Park above dog park and adjacent to bible collage The measurement location ML3 was located on the side of Wool Street overlooking the dog park at Anzac Park and adjacent to the bible college. The location is approximately 290m southeast of the Western Vent and approximately 140m southeast of the Western Motorway. The location is considered to be in a free-field. Noise levels at this site are dominated by road traffic noise from the Western Motorway. Plate 3.3: Showing the location of noise logger ML3 (Source: Google, Queensland Government) Photo 3.3: Showing ML3, looking northwest (Source: NMS) 13

14 Table 3.3: Average noise levels recorded at Location ML3, Friday 17 June 2016 (levels in db(a), free-field). Time of day L 01 L 10 L 90 L eq Day Evening Night Highest Day time 58.9 Highest Night time 60.0 Highest 1hr 61.2 CRTN (18hr) hr Figure 3.3: Noise levels at location ML3. 14

15 3.4 Measured Noise Levels at ML4 - Ada Park (east side of park boundary) The measurement location ML4 was located at the eastern edge of Ada Park on Richer Street approximately 500m northeast of the Western Vent. The location is considered to be in a free-field. Noise levels at this site are dominated by traffic along Mt Coot-Tha Road. Plate 3.4: Showing the location of noise logger ML4 (Source: Google, Queensland Government) Photo 3.4: Showing ML4, looking towards Richer Street (Source: NMS) 15

16 Table 3.4: Average noise levels recorded at Location ML4, Friday 17 June 2016 (levels in db(a), free-field). Time of day L 01 L 10 L 90 L eq Day Evening Night Highest Day time 61.0 Highest Night time 55.9 Highest 1hr 63.5 CRTN (18hr) hr Figure 3.4: Noise levels at location ML4. 16

17 4. Noise Level Predictions A noise model was constructed to predict the impact of noise from the ventilation systems onto surrounding sensitive uses. Noise modelling was undertaken using SoundPLAN v7.0 and the prediction methodology ISO9613-2: 1996 incorporating sound power levels from the SoundPlan Emission Library. Transmission loss spectra was sourced from Sound Insulation Prediction software INSUL and is incorporated in the prediction model where appropriate. All prediction models have limits to their accuracy of prediction. This is due to the inherent nature of the calculation algorithms that go into the design of the models, the assumptions made in the implementation of the model, and the availability of good source sound power data. Various researchers have suggested that an un-calibrated model has an accuracy of ±5 db while a calibrated model has an accuracy of ±2 db. ISO has an estimated accuracy for broadband noise of ±3 db at 1000 metres. Calibration means that the model has been established with reference to measured sound levels at a receiver, known source levels and tightly defined propagation variables (wind speed and direction, for example). Alternatively a series of predictions with different programs but the same assumption variables can be used for verification purposes. 4.1 Noise Source Levels The sound power level used in the noise model was calculated from the average spectra of the L 95 statistical measurements between midnight and 2:00am at Measurement Location ML1. Since the vent was observed to be inaudible, the L 95 is considered to be at least as loud as the vent and represents a conservative representation of the propagation of noise from the vent. The sound power level used to represent the Vent is presented in Table 4.1. The noise sources used in the model are positioned as shown in Plate 4.1 and 4.2. Table 4.1: Noise Source Description db(z) 63Hz 125Hz 250Hz 500Hz 1kHz 2kHz 4kHz Vent SWL Sum db(a) 17

18 Plate 4.1: Location of noise source, East Vent. Plate 4.2: Location of noise source, West Vent. 18

19 4.2 Sensitive Receptors There are 4 sensitive receptors specified for the East Vent and 2 sensitive receptors specified for the West Vent. These sensitive receptors are presented in Plate 4.3 and 4.4, and Table 4.2. Table 4.2: Approximate location of sensitive receptors Receptor Distance from Vent (m) Direction from Vent East Vent Victoria Park Road & Normanby Tce 195 WSW Victoria Park 20 W Brisbane Girls Grammar School 280 S QUT 210 NNW West Vent Mt Coot-tha Botanic Gardens 30 N Elizabeth Street, Toowong 280 S Cross Street, Toowong 315 SW Plate 4.3: Location of sensitive receptors, East Vent. 19

20 Plate 4.4: Location of sensitive receptors, West Vent. 4.3 Weather Conditions Noise modelling has been made using the prediction methodology ISO9613-2: 1996 which, by default, presents noise levels at the receiver for meteorological conditions which are favourable for propagation from the sound source to the receiver. The predicted noise levels are considered to represent the average propagation under meteorological conditions including wind and temperature inversion. 20

21 4.4 Predicted Noise Levels Predicted noise levels from the Ventilation System to each sensitive receptor are presented in Table 4.3. Visual noise contours are presented in Plates 4.5 to 4.8. The Criteria is the noise criteria extracted from the supplied documents referred to in the Reference Documents section, and summarised in Section 2. It is understood that these levels are based on levels measured in 2014, and are set out in the Noise and Vibration Management Operation and Maintenance EMP Subplan (Tunnel Alignment) (Figure 8). Table 4.3: Noise levels at affected façades of sensitive receptors. Levels are in db(a). Noise Level (db(a)) Receptor Ground Floor First Floor East Vent Criteria Criteria Victoria Park Road & Normanby Tce L A90,night Pass Victoria Park L A90,day Pass Brisbane Girls Grammar School L A90,day Pass QUT L A90,day Pass West Vent Cross Street, Toowong L A90,night Pass Elizabeth Street, Toowong L A90,night Pass Mt Coot-tha Botanic Gardens L A90,day Pass 21

22 Plate 4.5: Noise contours at the East Vent, Ground Floor level (1.8m). Levels are in db(a). Plate 4.6: Noise contours at the East Vent, First Floor level (4.6m). Levels are in db(a). 22

23 Plate 4.7: Noise contours at the West Vent, Ground Floor level (1.8m). Levels are in db(a). Plate 4.8: Noise contours at the West Vent, First Floor level (4.6m). Levels are in db(a). 23

24 Appendix A: Glossary Event maximum sound pressure level (L A%,adj,T), L A01 The L A01 level is calculated as the A-weighted noise level equalled and exceeded for 1% of the measurement time, for example 9 seconds in any 15 minute interval. L A01 is an appropriate level to characterise single events, such as from impulsive or distinctive pass-by noise (example: rail noise). In this Report, the measured L A01 levels for day/evening/night are not averaged but are arranged from low to high in the relevant day/evening/night interval and the value that is found at the 90th percentile in the interval was recorded as its L01 level. The level can be adjusted for tonality or impulsiveness. Average maximum sound pressure level (L A%,adj, T), L A10 The L A10 level is an indicator of steady-state noise or intrusive noise conditions from traffic, music and other relatively non-impulsive noise sources. The L A10 level is calculated as the A-weighted noise level equalled and exceeded for 10% the measurement time, for example 90 seconds in any 15 minute interval. The measured L A10 time-intervals for day/evening/night are arithmetically averaged to present the average maximum levels of the environment for day/evening/night. The level can be adjusted for tonality or impulsiveness. Background sound pressure level (L A90,T), L A90 Commonly called the "L90" or "background" level and is an indicator of the quietest times of day, evening or night. The L A90 level is calculated as the A-weighted noise level equalled and exceeded for 90% the measurement time. The measured L A90 time-intervals are arithmetically averaged to present the average background levels of the environment for day/evening/night. The level is recorded in the absence of any noise under investigation. The level is not adjusted for tonality or impulsiveness. Equivalent Continuous or time average sound pressure level (L Aeq,T), L Commonly called the "L Aeq" level it is the logarithmic average A-weighted noise level from all sources far and near. The maximum 1-hour levels within the day/evening/night time intervals are referenced. The level can be adjusted for tonality. Façade-affected level A sound level that is measured at a distance of 1.0 metres from a wall or facade. The level is nominally 2.5 db higher than the free-field level. Façade-adjusted level A sound level that is measured more than 3.5 metres from a reflective façade and adjusted to represent a measurement at a façade (example: side of building) at a distance of 1.0 metre. The level is nominally 2.5 db higher than the free-field level. Free-field level A sound level that is measured at a distance of more than 3.5 metres from a wall or facade. 24