Supporting Documentation - Renfrewshire Council

A photomontage is a computer-generated image based on a photograph taken from a specific point. The
photomontages in Appendix G, represent the predicted view and illustrates the predicted visual effect on
this view from the chosen viewpoints.
Wireframes are computer-generated line drawings, showing a 3D image of the landscape and help with
the assessment of the scale and position of the turbine within the surrounding area. Wireframes were
produced for each viewpoint representing the turbine visibility from the same point the photograph was
taken.
A panoramic view of the local landscape has also been produced to indicate the visibility of the proposed
turbine in the surrounding area. This view was taken from 1.0km from the turbine and is shown in
Appendix G.
The viewpoints and visualisation are shown in Appendix G.
3.7 Noise Sensitive Receptors
The sound power level measurements are taken from measurement data provided by the turbine
manufacturer. The measurements given were calculated according to ETSU-R-97 guidelines for L90-
10min levels and performed according to the International Standard IEC 64100-11 December 2002:
"Wind turbine generator systems – Part 11: Acoustic noise measurement techniques ".
ETSU-R-97 provides a framework for the assessment and rating of noise from wind turbine installations
and the noise limit criteria will be carried out in accordance to it. The guidelines recommend the
application of noise limits at the nearest noise sensitive properties to protect outside amenity and prevent
sleep disturbance inside dwellings. This guidance proposes a site standard of 5dB 22 LA90 10min above
background noise level. The guidance also includes a fixed limit at wind speeds or locations where
background noise levels are low. It would be expected a planning condition be applied to day time
operation of the turbine for this application of 35 – 40dB 22 LA90 10min. The night time guidance recommends
a limit of 43dB 22 LA90 10min. where the background noise is below 38 dB 22 LA90 10min. For the applicant, this
level night time level is raised to 45dB 22 LA90 10min.
From the manufacturer’s guidance documents, it is stated that at 420m away, a noise level of 35dB is
expected to be recorded and for a distance of 260m, a noise level of 40dB is likely. Therefore, it is
deemed likely that dwellings over 420m away from the proposed turbine site will not be affected by noise
levels. If however, a property is within 420m, but more than 260m from the proposed turbine location, it is
deemed likely that the noise levels recorded will still be within the range allowed as stated above. In
addition, the manufacturer's guidance states that tonal elements "cannot be classified as distinctly
audible" and therefore, are assumed not to be of consequence.
Other than the applicant, the closest noise sensitive receptors to the site include;
• Beech Tree Cottage, immediately adjacent to the site, approximately 420m from the proposed
turbine location.
• Brownside, two cottages at Mid Hartfield over 420m away, within 1km of the site.
As the nearest noise receptor other than the applicant, is over 420m away, the expected noise limits are
predicted to be below ETSU guidance. Therefore, it is concluded that a full noise impact assessment is
not deemed necessary.
Waterman Group, Renewable Energy, 2/4 Canning Street Lane, Edinburgh, EH3 8ER T:0131 221 7020
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Farm\Documents\Reports\CIV12920_1202xx_Hartfield_Supporting Turbine Assessment_225kW.docx