GEL must keep any noise on site below a certain decibel level mandated in the conditions of planning permission. Noise levels will be monitored both on site and at nearby receptors (often in the gardens of the nearest local houses) and if the nearby receptors show levels reaching close to the maximum noise levels for the time of day/night, GEL are alerted, the noise logs are assessed, and site management are contacted to ensure that work on site does not breach these levels. Work on site will be stopped if required.