Design and Access Statement Site: Lyng Farm, NR20 4JE

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Design and Access Statement Site: Lyng Farm, NR20 4JE Appendix A - Schematics The diagrams below are representative of the system proposed to be installed. The 15m tower is supported by a patented tripod system which is located on three helical piles, each of 4m depth. This type of foundation system has the advantage of being more environmentally sensitive than a large concrete block and easier to remove to reinstate the site in future. The works will be completed by our own installation team – we are a Microgeneration Certified Scheme (MCS) accredited installer and an ISO9001 certified organisation. Page | 12
Design and Access Statement Site: Lyng Farm, NR20 4JE Appendix B - Noise Report: Evance R9000 Acoustic Impact Assessment of Small Wind System Installation In considering the noise generation of small wind systems and the impact of this noise level on neighbouring properties, Windcrop has been working with local Environmental Health Officers to develop a practicable and clear method of presenting the expected impact. This makes use of the ETSU-R-97 assessment approach which takes into account not only the noise levels at noise sensitive locations but also sets these against the expected background noise levels for the normally experience range of site wind speeds. Under the ETSU-R-97 methodology, the site background noise is measured against wind speed and this is then compared against the expected noise immission from the wind system(s). To undertake this type of testing for a small system is completely uneconomic and as such the approach being developed is that tests are being carried out on a range of typical site types to generate a reliable empirical generic forecast of background noise for a range of site types. Whilst this work is in progress, and to enable safe assessment to be made of the impact of small wind systems on noise today, a low level assumed background noise curve has been agreed as shown on the attached graph. This is based on data taken on open, treeless sites and so represents a lowest expected background noise. It is also based on a base level of background noise with no wind of only 28dB. It is therefore expected that any typical rural site will have actual background above this level. The noise immission from the wind system(s) is then overlaid onto this background noise curve to enable an assessment to be made of the wind system noise compared with the background noise across the wind speed range. This shows that a worst case at a wind speed of around 7.5m/s wind speed. A decision is then needed on the relative level of the wind system to background. To date the approach has focussed on the nigh time levels at the façade of a neighbouring property and set the limit as 3dB above background. A secondary level has also been reviewed based on amenity use of a garden taking 5dB above background at the boundary of a neighbouring garden. At present only the façade level is being assessed on the basis that the typical boundary immission at the worst case of 7.5m/s wind speed is under 40dB and is considered well inside acceptable daytime amenity levels. Page | 13
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Design and Access Statement Site: Lyng Farm, NR20 4JE

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