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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