3.
R9 is represented by location MP1 at Bullenhall for the purposes of assessing the Converter Station and therefore was not measured during this second site visit.
4. Measurements were undertaken at a height of 1.5m and in free-field conditions i.e. >3.5m from a reflective surface using a Norsonic 118 type 1 sound level meter (‘SLM’) (serial no. 31677) with pre-amplifier and microphone protected by foam windshield and a Norsonic type 1251 acoustic calibrator (serial no. 32194).
5.
The calibration of the sound level meters was checked before and after the measurements using the acoustic calibrator, with no drift being observed. The SLMs conform to BS EN 61672-1:2003 Electroacoustics - Sound level meters, and the calibrator conforms to BS EN 60942:2003 Electroacoustics - Sound calibrators. The equipment used has a calibration history that is traceable to a certified calibration institution.
6.
During the measurements near to the Converter Station Compound, weather conditions were noted to be hot, dry and clear, with a slight breeze of approximately 1m/s. The temperature was approximately 28-30°C. At night, the temperature cooled to 13-14°C with small mist patches in the area. During the measurements from locations near to the Onshore Cable Route, weather conditions were noted to be dry, clear and calm throughout.
7.
The weather during all survey dates was considered suitable for noise measurements.
Environmental Baseline Onshore Cable Route
8.
The Onshore Cable Route largely runs through rural areas. Table 26.1 presents a description of the noise environment associated with each receptor location. Identification numbers are associated with HDD and CCS numbers above. Volume 6, Figure 26.2 shows the Onshore Cable Route with monitoring locations. Due to the geographical extent of the route, receptors are not individually specified for individual construction scenarios in the impact section of this chapter.
Table 26.1 Onshore cable route noise measurement locations Onshore Cable Route Noise Measurement Locations Location R1
Address Premier Inn Daytime Notes
Dominated by traffic noise on the A14, occasional train to the
west, birds in the trees
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Appendix 21.6 Baseline noise survey and supporting information Page 2
Night-time Notes
Dominated by HGV noise on A14
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