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BOC Immingham Dissolved Acetylene Project Environmental Statement: Vol. 2 Main Text
Construction Traffic Noise
11.76 The highest concentration of road traffic generated during construction is expected to be on
Hobson Way and Kiln Lane, in which 62 additional vehicles have been estimated with
approximately one-third (35%) of these being classed as HGVs.
11.77 Compared with the baseline traffic flows plus construction traffic expected as part of other
committed developments, the additional construction traffic generated by the proposed
development will not be significant. The resulting noise changes will be less than 1 dBA and the
impacts will be negligible.
Construction Vibration
11.78 The vibration levels from general construction activities and associated vehicles and plant are
expected to be negligible at the nearest dwellings on the basis of the separation distances
involved and also considering the likely ground conditions between source and receiver.
11.79 The vibration levels from potential percussive piling activities will not be significant at the nearest
dwellings, due to the distances involved. Depending on the ground conditions, foundation type of
the building and the piling technique employed, the levels could be perceptible in adjacent fields.
However, the levels of vibration would be well below those which could cause complaints in
residential environments.
11.80 Construction traffic is not expected to be at a sufficiently high level to result in significant vibration
impacts on the wider road network.
11.81 Thus, overall, the impact associated with vibration is considered to be negligible.
Operation
Hours of Operation
11.82 Standard operating hours are 0600 to 2200 hours Monday to Friday. Thus the facility will typically
operate for 16 hours per day, 5 days per week, and 50 weeks of the year. In the event of
acetylene supply constraints, or abnormal demand, the facility may need to operate outside the
standard operating hours for short periods.
11.83 Although operations are not planned to take place at the weekend, this assessment has also
compared the measured baseline weekend noise levels with the assessment results in order to
determine what the potential impact would be in the event of abnormal operational hours.
On site Noise Sources
11.84 The principal sources of noise at the facility are anticipated to be:
� gas compressors;
� air compressors (for tools instruments);
� cooling tower fan extract fans;
� lime transfer pump;
� tanker offloading pumps;
� cylinder handling moving via forklift pallet truck;
� generator hopper feeding carbide loading vibrating plate;
� shot blasting operations;
� Rotary Drum Filters, pump and motor noise;
� refrigeration plant (compressors, pumps);
5100935.404 Environmental Statement August 2011 201