SLIDE 1
– Why are WSP involved? – Acoustic terminology – Baseline noise monitoring – Project noise limits and regulatory noise criteria – Steady state noise (constancy)
Content
2
Bird-in-Hand Gold Mine Acoustics Content Why are WSP involved? - - PowerPoint PPT Presentation
Bird-in-Hand Gold Mine Acoustics Content Why are WSP involved? - - PowerPoint PPT Presentation
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?
SLIDE 2
SLIDE 3
– 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
monitoring and noise impact assessment while he was at AECOM
– Terramin have engaged WSP due to Simon’s previous knowledge of
the project
Why are WSP involved?
3
SLIDE 4
Acoustic terminology
4
Example
50 52 55 57 60 L90 50.8 Median (L50) 55.0 Average 54.8 Energy Average (Leq) 56.2 L10 58.8
– Relevant terms: Leq, L90, Lmax – Other terms: Lmin, L10, L50 (median)
SLIDE 5
– Baseline noise monitoring
was undertaken during September – October 2014, February – April 2015 and February – March 2016
– 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
5
SLIDE 6
– The locations in this figure are incorrect
Baseline noise monitoring
6
SLIDE 7
Baseline noise monitoring
7
SLIDE 8
Baseline noise monitoring
8
24 February 2014
SLIDE 9
Baseline noise monitoring
9
30 September 2014
SLIDE 10
Baseline noise monitoring
10
5 January 2015
SLIDE 11
Baseline noise monitoring
11
6 February 2016
SLIDE 12
Baseline noise monitoring
12
SLIDE 13
Baseline noise monitoring
13
SLIDE 14
14
– 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
– 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
SLIDE 15
15
– 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,
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
SLIDE 16
16
– Furthermore, Terramin are voluntarily adopting the requirement to
achieve a noise level 5 dBA lower than required by the Noise EPP for
- peration of the mine
– Therefore the project noise limits are 52 dBA during the day and
45dBA at night
– 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
SLIDE 17
17
Project noise limits and regulatory criteria
SLIDE 18
18
– Many noise sources are steady state, and already exist in the
background noise environment, such as:
– Air conditioners – Ventilation fans – Pumps – The Noise EPP recognises that some noises are more annoying than
- thers. Noises with annoying characteristics are:
– Modulating – Tonal – Impulsive – Low Frequency
Steady state noise
SLIDE 19
19
– 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* – Air compressors* – Air conditioning plant (administration buildings)
Steady state noise
SLIDE 20
20
– 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
is 33 dBA (at R12), then 24 dBA at R3 and R14
Steady state noise
SLIDE 21
21
Steady state noise
SLIDE 22
22
Steady state noise
– R12 continuous noise level vs background noise level at Location 2
SLIDE 23
23
Steady state noise
– R3 continuous noise level vs background noise level at Location 4
SLIDE 24
24