Table 26.6 Activity
Trenches
Assumed construction equipment used for noise calculations (BS 5228-1:2009) Scenario 1: Ducts
Scenario 2: Trenches and Ducts n/a Jointing pits HDDs
Telehandler 78dB 30T Excavator 75dB Loader 67dB Tractor & Trailer 79dB
n/a Haul Road
Loader 67dB D8 Dozer 86dB Grader 86dB Road Roller 80dB 9T Dumper 77dB 10T Excavator 75dB Tractor & Trailer 79dB Bowser 79dB Sweeper 76dB
Converter station
30T Excavator 75dB Dozer 86dB 9T Dumper 77dB Backactor Excavator 75dB Road Roller 80dB Telehandler 78dB Mobile Crane 78dB Static Crane 78dB 3T Dumper 77dB Scissor Lift 67db Concrete Pump 78dB
42.
30T Excavator 75dB Loader 67dB Trench Roller 80dB 9T Dumper 77dB Tractor & Trailer 79dB
Telehandler 78dB 30T Excavator 75dB Loader 67dB Tractor & Trailer 79dB
Driller Rig 79dB Crawler Rig 79dB Telehandler 78dB 3T Dumper 77dB
Loader 67dB D8 Dozer 86dB Grader 86dB Road Roller 80dB 9T Dumper 77dB 10T Excavator 75dB Tractor & Trailer 79dB Bowser 79dB Sweeper 76dB
30T Excavator 75dB Dozer 86dB 9T Dumper 77dB Backactor Excavator 75dB Road Roller 80dB Telehandler 78dB Mobile Crane 78dB Static Crane 78dB 3T Dumper 77dB Scissor Lift 67db Concrete Pump 78dB
*All noise levels are sourced from BS5228-1(2009) and are stated as LAeq @ 10m
It is assumed that the majority of construction works would be restricted to daytime working hours. The exceptions to this are likely to be the a) HDD drilling operations which, due to the nature of the drilling activity need to have the capacity to be undertaken continuously once drilling has commenced, and b) certain limited activities at the converter station including concrete pours.
43.
As an initial screening exercise, the distance from construction works at which the construction noise daytime lower impact threshold of 65dB LAeq 12hr would be exceeded was calculated. This ‘buffer’ distance, within which the construction noise limit is likely to be exceeded, is shown for the different construction activities in Table 26.7. The use of the 65dB LAeq 12hr construction noise limit is discussed further in the context of the baseline noise survey results in paragraph 100 below.
Preliminary Environmental Information May 2014
East Anglia THREE Offshore Windfarm
Chapter 26 Noise and Vibration Page 14
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