Forthbank Wind Energy Development - Partnerships for Renewables

Forthbank Wind Energy Development
8.5.15 For the purposes of the present assessment, all noise level predictions have been undertaken
using a receiver height of 4m above local ground level, mixed ground (g=0.5) and an air
absorption based on a temperature of 10°C and 70% relative humidity. These parameters,
the prediction methodology and type of wind turbine emission data used in this report are
consistent with best practice in the field as described in a recent IOA Bulletin article 11 . There
are no screening effects found at the site and therefore this element was excluded from the
model.
Predicted Wind Farm Operational Noise Immission Levels
8.5.16 Table 8.10 shows predicted noise immission levels at each of the selected assessment
locations for each 10m height wind speed from 3m/s to 12m/s inclusive. All wind farm noise
immission levels in this report are presented in terms of the L A90,T noise indicator in
accordance with the recommendations of the ETSU-R-97 report, obtained by subtracting 2
dB(A) from the calculated L Aeq,T noise levels based on the warranted turbine sound power
levels presented in Table 8.8 and Table 8.9.
Table 8.10 Predicted L A90,T Wind Farm Noise Immission Levels (dB) at 4m Height at Each
of the Noise Assessment Locations as a Function of 10m Height Wind Speed
Property
Wind Speed at 10m Height, m/s
3 4 5 6 7 8 9 10 11 12
Park Farm 26.6 30.6 34.1 37.1 38.1 38.6 38.6 38.6 38.6 38.6
Dunmore Home Farm 24.6 28.6 32.1 35.1 36.1 36.6 36.6 36.6 36.6 36.6
13 Riverside View 29.8 33.8 37.3 40.3 41.3 41.8 41.8 41.8 41.8 41.8
Inch of Ferryton 25.0 29.0 32.5 35.5 36.5 37.0 37.0 37.0 37.0 37.0
Craigrie 23.7 27.7 31.2 34.2 35.2 35.7 35.7 35.7 35.7 35.7
Dunmore East 25.5 29.5 33.0 36.0 37.0 37.5 37.5 37.5 37.5 37.5
Dunmore Town 24.4 28.4 31.9 34.9 35.9 36.4 36.4 36.4 36.4 36.4
Bowhouse Gardens 28.7 32.7 36.2 39.2 40.2 40.7 40.7 40.7 40.7 40.7
South Alloa 21.8 25.8 29.3 32.3 33.3 33.8 33.8 33.8 33.8 33.8
12 Riverside View 28.4 32.4 35.9 38.9 39.9 40.4 40.4 40.4 40.4 40.4
8.6 Mitigation Measures
Construction Noise
8.6.1 To reduce the potential noise effect of construction noise, the following types of mitigation
measures are proposed:
• Those activities that may give rise to audible noise at the surrounding properties and
heavy goods vehicle deliveries to the site would be limited to the hours 07:00 to
19:00 Monday to Friday and 09:00 to 16:00 on Saturdays. Turbine deliveries would
only take place outside these times with the prior consent of the Clackmannanshire
Council and the Police. Those activities that are unlikely to give rise to noise
audible at the site boundary will continue outside of the stated hours;
• All construction activities shall adhere to good practice as set out in BS 5228-1;
• All equipment will be maintained in good working order and any associated noise
attenuation such as engine casing and exhaust silencers shall remain fitted at all
times;
November 2010 Chapter 8 Page 16
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