Theratinglevelofnoiseemissionsfromthewindturbine.docVIP

Theratinglevelofnoiseemissionsfromthewindturbine.doc

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Theratinglevelofnoiseemissionsfromthewindturbine

The rating level of noise emissions from the wind turbine generator, when measured and calculated in accordance with the Guidance Notes below shall not exceed the following levels at the stated wind speed at the named dwellings in Methil and Buckhaven (All measurements are LAF90,10min ): Wind Speed at 10m Height 4 5 6 7 8 9 10 11 12 Rear Boundary of 20 Wellesley Road Night-Time Noise Limit 43 43 43 44.5 47.2 49.9 51.6 51.2 51.2 Day-Time Noise Limit 44 44.1 44.8 46.3 48.8 48.8 48.8 48.8 48.8 Rear boundary of 94 Wellesley Road Night-Time Noise Limit 43 43 43 43 43.4 46.7 49.1 49.9 49.9 Day-Time Noise Limit 41.3 41.5 42.7 45.1 47.9 47.9 47.9 47.9 47.9 Rear garden of 12 Erskine Street Night-Time Noise Limit 43 43 43 43 43 44.2 46 46 46 Day-Time Noise Limit 38.9 38.9 38.9 41.2 44.1 44.1 44.1 44.1 44.1 THE GUIDANCE NOTES The following paragraphs are based upon steps 2-6 specified in Section 2 of the Supplementary Guidance Notes to the Planning Obligation contained within pages 102 et seq of “The Assessment and Rating of Noise from Wind Farms, ETSU-R-97” published by ETSU for the Department of Trade and Industry. It has been adapted in the light of experience of actual compliance measurements. Note 1 Values of the LA90,10min noise statistic should be measured at the affected property using a sound level meter of at least IEC 651 Type 1 quality. This should be fitted with a ? diameter microphone and calibrated in accordance with the procedure specified in BS 4142: 1990. The microphone should be mounted on a tripod at 1.2 - 1.5 m above ground level, fitted with a two layer windshield wind shield or suitable equivalent, and placed in the vicinity of, and external to, the property. The intention is that, as far as possible, the measurements should be made in “free-field” conditions. To achieve this, the microphone should be placed at least 3.5m away from the building facade or any reflecting surface except the ground. The LA90,10min measurements should b

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