Structure-borne noise will be caused by the drilling that we will be carrying out in the rock. Although it will not be possible to hear the drilling at that distance, the noise from it will propagate in the rock and cause sound waves that spread to the surface. People may perceive structure-borne noise to vibrate and be monotonous and muffled. The structure-borne noise will decline gradually as the various tunnel fronts move forward by about 10-20 metres a week.
Blasting noise is caused by explosions in the rock. These noises are short-lived and can be heard on the surface as a muffled explosion from inside the rock. We will be blasting on a number of different fronts simultaneously, and the loudest noise will be heard above the tunnel fronts. The noise and vibrations fron the blastings can sometimes travel far from the blasting site.
When drilling and blasting are complete, stone will need to be knocked out with hammers and then the rock spoil has to be loaded. People living nearby will not hear the loading of rock spoil, and this will take place at some point during our planned working hours of 7am to 10pm.