Bird-in-Hand Gold Mine Acoustics
Content – Why are WSP involved? – Acoustic terminology – Baseline noise monitoring – Project noise limits and regulatory noise criteria 2 – Steady state noise (constancy)
Why are WSP involved? – Baseline noise monitoring and the noise impact assessment was undertaken by AECOM – Simon Moore was previously employed by AECOM and moved to WSP in September 2017 – Simon was the lead acoustic engineer for the baseline noise 3 monitoring and noise impact assessment while he was at AECOM – Terramin have engaged WSP due to Simon’s previous knowledge of the project
Acoustic terminology – Relevant terms: L eq , L 90 , L max Example – Other terms: L min , L 10, L 50 (median) 50 52 55 57 60 L 90 50.8 4 Median (L 50 ) 55.0 Average 54.8 Energy Average (L eq ) 56.2 L 10 58.8
Baseline noise monitoring – Baseline noise monitoring was undertaken during September – October 2014, February – April 2015 and February – March 2016 5 – The baseline noise monitoring was undertaken at 4 locations – Baseline noise monitoring was delayed due to earthworks being undertaken for the construction of Petaluma Wines
Baseline noise monitoring – The locations in this figure are incorrect 6
Baseline noise monitoring 7
Baseline noise monitoring 24 February 2014 8
Baseline noise monitoring 30 September 2014 9
Baseline noise monitoring 5 January 2015 10
Baseline noise monitoring 6 February 2016 11
Baseline noise monitoring 12
Baseline noise monitoring 13
Project noise limits and regulatory criteria – Area is zoned as Watershed (Primary Production) Zone within the Onkaparinga Valley Policy Area (Adelaide Hills Council Development Plan) – Noise source (Terramin BiH Gold Mine) and surrounding noise sensitive receivers are all located within this zone and policy area 14 – The zone and policy area principally promote Rural Industry land use – Based on SA EPA Environment Protection (Noise) Policy 2007 (Noise EPP), the applicable regulatory noise criteria are 57 dBA during the day period (7am-10pm) and 50 dBA at night (10pm-7am)
Project noise limits and regulatory criteria – This is a development under the Mining Act 1971 – If this were a proposed new development under the Development Act 1993 , the applicable noise criteria would be further reduced by 5 dBA. The purpose is to allow for multiple noise sources in the area. – In addition, if it were a development under the Development Act 1993 , 15 there would be no day time noise limits during construction – As the development is being regulated under the Mining Act 1971 , Terramin are required to comply with the noise criteria at all times, including construction – Therefore, the construction noise limits are more stringent than would be applied to any other development in the area being undertaken under the Development Act 1993
Project noise limits and regulatory criteria – Furthermore, Terramin are voluntarily adopting the requirement to achieve a noise level 5 dBA lower than required by the Noise EPP for operation of the mine – Therefore the project noise limits are 52 dBA during the day and 45dBA at night 16 – Terramin are also adopting “leading indicator” noise level targets, which are set an additional 5 dBA below the project noise limits – The leading indicator noise level targets are 47 dBA during the day and 40 dBA at night – Therefore, the leading indicator noise level targets are more stringent than would be applied to any other development in the area being undertaken under the Development Act 1993
Project noise limits and regulatory criteria 17
Steady state noise – Many noise sources are steady state, and already exist in the background noise environment, such as: – Air conditioners – Ventilation fans – Pumps 18 – The Noise EPP recognises that some noises are more annoying than others. Noises with annoying characteristics are: – Modulating – Tonal – Impulsive – Low Frequency
Steady state noise – Continuous steady state noise is not considered to be an annoying characteristic, and as such is not penalised under the Noise EPP – Steady state noise sources included in the proposed mine include: – Ventilation fans – Water pumps* 19 – Air compressors* – Air conditioning plant (administration buildings)
Steady state noise – Noise model has been checked to determine the contribution from the continuous noise sources – (primary vent shaft, magazine vent shaft, raw water plant, water treatment plant, wash down pump and workshop air compressor) – Highest predicted noise level from the continuous noise sources on site 20 is 33 dBA (at R12), then 24 dBA at R3 and R14
Steady state noise 21
Steady state noise – R12 continuous noise level vs background noise level at Location 2 22
Steady state noise – R3 continuous noise level vs background noise level at Location 4 23
Steady state noise – R14 continuous noise level vs background noise level at Location 1 24
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