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BOC Immingham Dissolved Acetylene Project Environmental Statement: Vol. 2 Main Text Noise Measurement Positions and Conditions 11.43 The noise survey measurement positions are described in Table 11.4 and shown in Figure 11.1. 11.44 At each measurement position, the microphone was positioned at a height of approximately 1.5 m from the ground and at least 3.5 m from any other reflective surface. Measurements were deemed to be subject to free-field conditions. 11.45 The weather conditions during the survey were generally clear, dry and warm with a light intermittent breeze (
BOC Immingham Dissolved Acetylene Project Environmental Statement: Vol. 2 Main Text Survey Equipment Figure 11.1 Noise Survey Measurement Positions 11.46 A Norsonic 118 (Serial No. 31609) with a type 1225 microphone (Serial No. 52305) was used to perform the short-term satellite measurements. A BrÜel & Kjaer 2238 Mediator (Serial No. 2381615) with a type 4188 microphone (Serial No. 2372203) was used to perform the continuous long-term measurements at Position A. 11.47 Calibration of the sound level meters and microphones used for the measurements are traceable to UKAS accredited laboratories. The calibration of both sound level meters and microphones was checked using a 1 kHz tone at 114 dB prior to and following the measurements performed. No significant drift in calibration was observed. Short Term Noise Monitoring 11.48 Table 11.5 presents a summary of results with regard to the short-term measured noise levels. Table 11.5 Results of Short-Term Noise Measurements Position Date Start Time LAeq,15min LA90,15min LAFmax,15min 1 06/06/2011 13:35 52.0 47.8 71.4 1 06/06/2011 13:50 53.0 49.8 72.3 1 06/06/2011 21:15 51.0 45.9 73.9 1 06/06/2011 23:40 49.5 43.9 61.3 1 07/06/2011 10:50 55.4 52.1 73.5 5100935.404 Environmental Statement August 2011 195
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