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Round 1 Noise Monitoring Results February 2018

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Round 1 Noise Monitoring Results February 2018 Ararat Wind Farm Noise Compliance Testing S2894C34 February 2018 sonus . Sonus Pty Ltd 17 Ruthven Avenue Adelaide 5000 SA Phone: +61 (8) 8231 2100 www.sonus.com.au Page 1 Ararat Wind Farm Noise Compliance Testing S2894C33 February 2018 . sonus Document Title : Ararat Wind Farm Noise Compliance Testing Document Reference : S2894C33 Date : February 2018 Prepared By : Chris Turnbull, MAAS Reviewed By : Jason Turner, MAAS TABLE OF CONTENTS 1 INTRODUCTION ................................................................................................................................. 3 2 CRITERIA ........................................................................................................................................... 3 3 STAGE 1 TESTING .............................................................................................................................. 5 3.1 Testing Location ...............................................................................................................................5 3.2 Data Collection .................................................................................................................................6 3.3 Data Analysis ....................................................................................................................................6 3.4 Stage 1 Test Results..........................................................................................................................7 4 STAGE 2 TESTING ............................................................................................................................ 10 4.1 Test Methods ................................................................................................................................ 10 4.2 Stage 2 testing for higher wind speeds ......................................................................................... 11 4.3 Stage 2 testing for lower wind speeds .......................................................................................... 13 5 SPECIAL AUDIBLE CHARACTERISTICS ................................................................................................ 15 5.1 Tonality .......................................................................................................................................... 15 5.2 Amplitude Modulation .................................................................................................................. 16 6 CONCLUSION .................................................................................................................................. 17 Page 2 Ararat Wind Farm Noise Compliance Testing S2894C33 February 2018 . sonus 1 INTRODUCTION Sonus has been engaged by GE Renewable Energy to conduct noise compliance testing in accordance with the Noise Compliance Testing Plan1 (NCTP). The NCTP provides a staged methodology. Stage 1 is the primary method of NZS 6808:19982. Where compliance cannot be confirmed in Stage 1 then the NCTP establishes additional test methods (Stage 2). This report summarises the results of the Stage 1 and Stage 2 tests for the Ararat Wind Farm. The Stage 1 and Stage 2 tests together comprise the first round3 of noise compliance testing. 2 CRITERIA The applicable noise criteria are established in accordance with NZS6808:1998 with the exception of being considered over both the “all-time” (24 hours) and “night-time” (10pm to 7am) periods. The noise criteria provided by NZS6808:1998 is an LA95 of 40 dB(A) or the measured background noise level plus 5 dB(A), whichever is the greater. The background noise level is determined in accordance with Section 4.5 of NZS6808:1998. Sonus has conducted background noise level measurements at 19 dwellings in the vicinity of the Ararat Wind Farm between December 2015 and March 2016. Details of the noise measurements and the measured background noise levels at each dwelling are summarised in Sonus report S2894C30, dated June 2016. Based on the measured background noise levels, the relevant noise criteria at each residence for the all-time and night-time periods have been determined, as provided in Table 1 and Table 2, respectively. The background noise monitoring regime commenced during construction of the Ararat Wind Farm. Whilst it was considered that the construction activity did not affect the results due to the distances to the activity and the measurement process, an assessment of the data has been conducted and is provided in Appendix A. The assessment confirms that the construction activity did not influence the measured background noise levels. 1 Sonus document S2894C20 (dated July 2013), established in accordance with the relevant conditions of Ararat Rural City Council Permit No. 09/004799 and Northern Grampians Shire Council Permit No. 5.2009.94.1., and approved by the Minister for Planning. 2 New Zealand Standard NZS 6808:1998 Acoustics – The assessment and measurement of sound from wind turbine generators. 3 Two rounds of noise compliance testing are required under the Permit. Page 3 Ararat Wind Farm Noise Compliance Testing S2894C33 February 2018 . sonus Table 1: Criteria for “all time” period. Monitoring Background Noise Level, LA95,10 (dB(A)) at 85m Hub Height Integer Wind Speeds Location ID 4 m/s 5 m/s 6 m/s 7 m/s 8 m/s 9 m/s 10 m/s 11 m/s 12 m/s 13 m/s 14 m/s AH03 40 40 40 40 40 40 40 40 42 43 45 AH05 40 40 40 40 40 40 42 44 45 47 49 AH06 40 40 40 40 40 40 42 44 46 48 49 AH10 40 40 40 40 40 40 41 43 45 47 49 AH12 40 40 40 40 40 40 41 42 44 45 46 AH13 40 40 40 40 40 40 42 43 44 45 44 AH14 40 40 40 40 40 40 40 41 42 42 41 AH15 40 40 40 40 40 40 40 41 41 41 41 AH38 40 40 40 40 40 41 43 45 45 45 44 AH39 40 40 40 40 40 40 40 42 43 44 44 AH40 40 40 40 40 40 42 44 45 47 47 46 AH41 40 40 40 40 40 40 41 43 45 47 48 AH42 40 40 40 40 40 42 45 47 49 51 53 AH43 40 40 40 40 40 40 42 44 46 47 47 AH44 40 40 40 40 40 40 42 43 45 46 46 AH46 40 40 40 40 40 40 42 44 46 48 51 AH51 40 40 40 40 40 40 40 40 42 44 46 AH52 40 40 40 40 40 40 40 42 44 46 48 AH53 40 40 40 40 40 40 40 41 43 45 48 Table 2: Criteria for “night time” period. Monitoring Background Noise Level, LA95,10 (dB(A)) at 85m Hub Height Integer Wind Speeds Location ID 4 m/s 5 m/s 6 m/s 7 m/s 8 m/s 9 m/s 10 m/s 11 m/s 12 m/s 13 m/s 14 m/s AH03 40 40 40 40 40 40 40 40 40 42 43 AH05 40 40 40 40 40 40 40 40 42 44 46 AH06 40 40 40 40 40 40 40 40 42 44 46 AH10 40 40 40 40 40 40 40 40 43 47 51 AH12 40 40 40 40 40 40 40 40 41 43 46 AH13 40 40 40 40 40 40 40 40 41 44 47 AH14 40 40 40 40 40 40 40 40 42 43 44 AH15 40 40 40 40 40 40 40 40 41 43 43 AH38 40 40 40 40 40 40 40 41 43 44 45 AH39 40 40 40 40 40 40 40 40 40 40 40 AH40 40 40 40 40 40 40 40 42 44 45 45 AH41 40 40 40 40 40 40 40 40 43 47 52 AH42 40 40 40 40 40 40 41 44 48 53 59 AH43 40 40 40 40 40 40 40 42 44 45 45 AH44 40 40 40 40 40 40 40 40 43 46 50 AH46 40 40 40 40 40 40 40 41 45 51 59 AH51 40 40 40 40 40 40 40 40 40 41 43 AH52 40 40 40 40 40 40 40 40 40 40 40 AH53 40 40 40 40 40 40 40 40 40 42 45 Page 4 Ararat Wind Farm Noise Compliance Testing S2894C33 February 2018 . sonus 3 STAGE 1 TESTING 3.1 Testing Location The NCTP requires the Stage 1 testing to be conducted at all non-stakeholder dwellings where the predicted noise level is at or above 35 dB(A), subject to access being granted. The relevant non-stakeholder dwellings have been determined based on the predicted noise levels from the final turbine arrangement, as summarised in the Sonus report S2894C24, dated April 2014. A total of 21 dwellings were identified, with access being granted for 19 locations (refer Table 3). There were 2 dwellings in the 21 identified where access was denied by the owners, being at AH08 (680796E 5872989N) and AH09 (680740E 5872799N). At each of the remaining 19 dwellings, noise logging equipment was placed at the equivalent position to the background noise logging location. Generally, the position was on the wind farm side of the dwelling and at least 5m from the building facade to remove the effects of large reflecting surfaces. A photograph of the noise logging equipment at each dwelling is provided in Appendix B. In addition to the noise logging, local wind speed logging was also conducted at 10 locations, with rainfall data collected at 4 locations. The rainfall data and the measured wind speed at the microphone height were used to identify periods when data might have been adversely affected by weather. For locations where the local weather logging equipment was not deployed, data from the closest weather logger has been used in the analysis. Table 3 provides the coordinates of the 19 noise testing locations for the Stage 1 testing, and includes the monitoring period at each location and the local weather logging details. Table 3: Stage 1 noise testing locations. Testing Coordinates (WGS 84 Zone 54) Wind Rain No Monitoring Period Location Easting Northing Logger Logger 1 AH03 676173 5883809 01/08/2017 – 18/09/2017 AH03 AH53 2 AH05 677240 5877436 01/08/2017 – 18/09/2017 AH06 AH53 3 AH06 677508 5875847 01/08/2017 – 18/09/2017 AH06 AH53 4 AH10 684902 5873587 31/07/2017 – 19/09/2017 AH12 AH14 5 AH12 686435 5873123 31/07/2017 – 19/09/2017 AH12 AH14 6 AH13 686881 5873171 11/10/2017 – 22/11/2017 AH13 AH13 7 AH14 687352 5872154 31/07/2017 – 19/09/2017 AH14 AH14 8 AH15 687467 5872059 31/07/2017 – 19/09/2017 AH14 AH14 9 AH38 689658 5874816 31/07/2017 – 10/09/2017 AH38 AH14 10 AH39 689581 5874970 31/07/2017 – 11/09/2017 AH38 AH14 11 AH40 689599 5875129 31/07/2017 – 18/09/2017 AH40 AH14 Page 5 Ararat Wind Farm Noise Compliance Testing S2894C33
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